Space Shuttle - Space Shuttle - Wikipedia

Ushbu maqola NASA tomonidan ishlatiladigan kosmik kemalar tizimi haqida. Umuman olganda kosmik kemalar uchun qarang kosmik kemalar va kosmik samolyot.
Space Shuttle
STS120LaunchHiRes-edit1.jpg
Kashfiyot boshida ko'tariladi STS-120.
FunktsiyaEkipaj orbitasini ishga tushirish va qayta kirish
Ishlab chiqaruvchi
Ishlab chiqaruvchi mamlakat; ta'minotchi mamlakatQo'shma Shtatlar
Loyiha qiymati211 AQSh dollari milliard (2012)
Ishga tushirish narxi576 AQSh dollari million (2012) dan 1,64 dollargacha milliard (2012)
Hajmi
Balandligi56,1 m (184 fut 1 dyuym)
Diametri8,7 m (28 fut 7 dyuym)
Massa2.030.000 kg (4.470.000 lb)
Bosqichlar1.5
Imkoniyatlar
Yuk ko'tarish Past Yer orbitasi (LEO) (204 km yoki 127 milya)
Massa27,500 kg (60,600 funt)
Yuk ko'tarish Xalqaro kosmik stantsiya (XKS) (407 km yoki 253 milya)
Massa16,050 kg (35,380 lb)
Yuk ko'tarish qutb orbitasi
Massa12,700 kg (28,000 lb)
Yuk ko'tarish Geostatsionar uzatish orbitasi (GTO)
Massa10.890 kg (24.010 lb) bilan Inertial yuqori bosqich[1]
Yuk ko'tarish Geostatsionar orbit (GEO)
Massa2270 kg (5000 funt) inertial yuqori bosqich bilan[1]
Yerga foydali yuk qaytadi
Massa14,400 kg (31,700 funt)[2]
Tarixni ishga tushirish
HolatPensiya
Saytlarni ishga tushirish
Jami ishga tushirildi135
Muvaffaqiyat (lar)133[a]
Xato (lar)2
Birinchi parvoz1981 yil 12 aprel
Oxirgi reys2011 yil 21-iyul
E'tiborli foydali yuklar
Kuchaytirgichlar - Qattiq raketa kuchaytirgichlari
Dvigatellar2 qattiq yonilg'i bilan ishlaydigan raketa motorlar
Bosish12,500 kN (2,800,000 funt), dengiz sathidan ko'tarilish
Maxsus impuls242 soniya (2,37 km / s)
Yonish vaqti124 s
Yoqilg'iQattiq (ammoniy perklorat kompozit yoqilg'isi )
Birinchi bosqich - Orbiter + tashqi tank
Dvigatellar3 RS-25 Orbiter-da joylashgan dvigatellar
Bosish5,250 kN (1,180,000 lbf), dengiz sathidan ko'tarilish[3]
Maxsus impuls455 soniya (4,46 km / s)
Yonish vaqti480 s
Yoqilg'iLH2 / LOX
Boosters
Yo'q2

The Space Shuttle qisman edi qayta foydalanish mumkin past Yer orbitalidir kosmik kemalar tizim 1981 yildan 2011 yilgacha Milliy aviatsiya va kosmik ma'muriyat (NASA) ning bir qismi sifatida Space Shuttle dasturi. Uning rasmiy dastur nomi 1969 yilgi rejadan olingan kosmik transport tizimi (STS) edi qayta ishlatiladigan kosmik kemalar tizimi qaerda u rivojlanish uchun mablag 'bilan ta'minlangan yagona narsa edi.[4] To'rtta orbital sinov parvozining birinchisi 1981 yilda sodir bo'lgan va 1982 yilda boshlangan tezkor parvozlarga olib kelgan. "Space Shuttle" orbiterining beshta to'liq vositasi qurilgan va 1981 yildan 2011 yilgacha jami 135 ta missiyada uchgan. Kennedi nomidagi kosmik markaz (KSC) Florida shtatida joylashgan. Operatsion missiyalar ko'plab boshlandi sun'iy yo'ldoshlar, Sayyoralararo zondlar, va Hubble kosmik teleskopi (HST); orbitada ilmiy tajribalar o'tkazdi; ishtirok etdi Shuttle -Mir dastur Rossiya bilan; va qurilish va xizmat ko'rsatishda ishtirok etdi Xalqaro kosmik stantsiya (ISS). Space Shuttle flotining parvozning umumiy vaqti 1322 kun, 19 soat, 21 daqiqa va 23 soniyani tashkil etdi.[5]

Space Shuttle komponentlariga quyidagilar kiradi Orbiter transport vositasi (OV) uchta klaster bilan Rocketdyne RS-25 asosiy dvigatellar, qayta tiklanadigan juftlik qattiq raketa kuchaytirgichlari (SRB) va sarflanadigan tashqi tank (ET) o'z ichiga oladi suyuq vodorod va suyuq kislorod. Kosmik Shuttle edi vertikal ravishda ishga tushirildi, odatdagi raketa kabi, ikkita SRB orbitaning uchtasiga parallel ravishda ishlaydi asosiy dvigatellar, ular ET dan yoqilg'i bilan ta'minlangan. SRBlar transport vositasi orbitaga chiqmasdan va ET esa undan oldin o'tib ketgan orbitaga qo'shib qo'yish orbitaning ikkitasidan foydalangan Orbital manevr tizimi (OMS) dvigatellari. Missiya tugagandan so'ng, orbitachi OMS-ni deorbit va atmosferani qayta kiriting. Orbiter qayta kirish paytida uni himoya qildi termal himoya qilish tizimi plitkalar va u sirpandi kabi kosmik samolyot uchish-qo'nish yo'lagining qo'nishigacha, odatda Shuttle qo'nish vositasi Florida shtatidagi KSCda yoki Rojers Quruq Leyk yilda Edvards havo kuchlari bazasi, Kaliforniya. Agar qo'nish Edvardsda sodir bo'lgan bo'lsa, orbitachi yana KSCga uchib ketgan Shuttle Carrier Aircraft, maxsus o'zgartirilgan Boeing 747.

Birinchi orbitachi, Korxona, 1976 yilda qurilgan va ishlatilgan Yondashuv va qo'nish sinovlari, ammo orbital qobiliyati yo'q edi. Dastlab to'rtta to'liq ishlaydigan orbitalar qurildi: Kolumbiya, CHellenjer, Kashfiyot va Atlantis. Ulardan ikkitasi avariya halokatida halok bo'lgan: CHellenjer 1986 yilda va Kolumbiya 2003 yilda, jami o'n to'rtta astronavt o'ldirilgan. Beshinchi operatsion (va oltinchisi) orbitachi, Harakat qiling, o'rniga 1991 yilda qurilgan CHellenjer. "Space Shuttle" samolyoti tugagandan so'ng xizmatdan bo'shatildi Atlantis'2011 yil 21 iyuldagi so'nggi parvoz. AQSh ruslarga ishongan Soyuz kosmik kemasi astronavtlarni XKSga so'nggi Shuttle parvozidan uchirilguniga qadar etkazib berish Demo-2 missiya 2020 yil may oyida.

Loyihalash va ishlab chiqish

Tarixiy ma'lumot

1950 yillar davomida Amerika Qo'shma Shtatlari havo kuchlari razvedka, sun'iy yo'ldosh hujumi va erdan qurolga ishlov berish kabi harbiy operatsiyalarni bajarish uchun qayta ishlatiladigan uchar laynerdan foydalanishni taklif qildi. 1950-yillarning oxirida Havo kuchlari qisman qayta ishlatilishi mumkin bo'lgan narsalarni ishlab chiqara boshladi X-20 Dyna-Soar. Harbiy-havo kuchlari Dyna-Soarda NASA bilan hamkorlik qildi va 1961 yil iyun oyida oltita uchuvchini tayyorlashni boshladi. Rivojlanish narxlarining ko'tarilishi va ustuvorligi Egizaklar loyihasi 1963 yil dekabrda Dyna-Soar dasturining bekor qilinishiga olib keldi. Dyna-Soar bilan bir qatorda, havo kuchlari 1957 yilda qayta ishlatilishi mumkin bo'lgan kuchaytirgichlarning maqsadga muvofiqligini sinab ko'rish uchun tadqiqot o'tkazdilar. Bu uchun asos bo'ldi aerospaceplane, 1962-1963 yillarda dastlabki dizayn bosqichidan tashqarida hech qachon ishlab chiqilmagan, to'liq qayta ishlatiladigan kosmik kemasi.[6]:162–163

1950-yillarning boshlaridan boshlab NASA va Havo kuchlari rivojlanish bo'yicha hamkorlik qildilar ko'tarish tanalari birinchi navbatda qanotlari o'rniga fyuzelyajlaridan ko'tarilishni hosil qilgan va sinovdan o'tgan samolyotlarni sinovdan o'tkazish M2-F1, M2-F2, M2-F3, HL-10, X-24A, va X-24B. Dastur keyinchalik aerodinamik xususiyatlarini sinovdan o'tkazdi, ular keyinchalik "Space Shuttle" dizaynida o'zlashtirilishi kerak, shu jumladan, balandlik va tezlikdan elektrsiz qo'nish.[7]:142[8]:16–18

Loyihalash jarayoni

Asosiy maqola: Space Shuttle dizayn jarayoni

1966 yil sentyabr oyida NASA va Harbiy-havo kuchlari birgalikda o'zlarining kelgusidagi talablarini qondirish uchun yangi transport vositasi talab qilinganligi va qisman qayta ishlatilishi mumkin bo'lgan tizim eng tejamli echim bo'lishi to'g'risida qo'shma tadqiqot o'tkazdilar.[6]:164 NASA tomonidan boshqariladigan kosmik parvozlar bo'limi rahbari, Jorj Myuller, 1968 yil 10-avgustda qayta ishlatilishi mumkin bo'lgan transport vositasi rejasini e'lon qildi. NASA a taklif uchun so'rov Keyinchalik "Space Shuttle" ga aylanadigan Integrated Launch and Re-Enter Vehicle (ILRV) dizaynlari uchun (RFP). Dastlabki takliflar asosida shartnoma imzolash o'rniga, NASA Space Shuttle shartnomasi va ishlanmasi uchun bosqichma-bosqich yondashuvni e'lon qildi; A bosqichi - bu raqobatchi aerokosmik kompaniyalar tomonidan yakunlangan tadqiqotlar uchun so'rov, B bosqichi - bu ikki pudratchi o'rtasida ma'lum bir shartnoma uchun raqobat, S fazasi kosmik qurilmalar detallarini loyihalash bilan bog'liq edi va D fazasi kosmik kemani ishlab chiqarish edi.[9][8]:19–22

1968 yil dekabrda NASA qayta ishlatilishi mumkin bo'lgan kosmik kemaning optimal dizaynini aniqlash uchun "Space Shuttle" vazifa guruhini yaratdi va shu bilan tadqiqot shartnomalarini tuzdi. Umumiy dinamikasi, Lokid, McDonnell Duglas va Shimoliy Amerika Rokvell. 1969 yil iyul oyida "Space Shuttle" vazifa guruhi "Shuttle" qisqa muddatli ekipaj missiyalari va kosmik stantsiyani qo'llab-quvvatlashini, shuningdek sun'iy yo'ldoshlarni uchirish, xizmat ko'rsatish va olish imkoniyatlarini qo'llab-quvvatlashini aniqladi. Hisobotda kelajakda qayta ishlatilishi mumkin bo'lgan transport vositasining uchta klassi yaratildi: I sinf sarflanadigan kuchaytirgichlarga o'rnatiladigan qayta ishlatiladigan orbitaga ega bo'lar edi, II sinf ko'p sarflanadigan raketa dvigatellari va bitta yoqilg'ida ishlaydigan tank (yarim-yarim) va III sinf ham qayta ishlatilishi mumkin bo'lgan orbitaga, ham qayta ishlatiladigan kuchaytirgichga ega bo'lar edi. 1969 yil sentyabr oyida vitse-prezident rahbarligida kosmik vazifalar guruhi Spiro Agnew, odamlar va yuklarni Yerning past orbitasiga (LEO) olib chiqish uchun kosmik kemani ishlab chiqishga va shuningdek kosmik tortish orbitalar va Oy o'rtasidagi o'tkazmalar uchun va qayta foydalanish mumkin yadro yuqori bosqichi chuqur kosmik sayohat uchun.[6]:163–166[4]

Space Shuttle Task Group hisoboti chiqarilgandan so'ng, ko'plab aerokosmik muhandislar qo'shimcha xarajatlarni tejashni hisobga olgan holda to'liq qayta ishlatilishi mumkin bo'lgan III sinfni ma'qullashdi. Maks Faget, loyihalashtirishda ishlagan NASA muhandisi Merkuriy kapsula, kattaroq tekis qanotli kuchaytirgichga o'rnatilgan tekis qanotli orbitaga ega bo'lgan ikki bosqichli to'liq tiklanadigan tizim uchun dizayni patentlangan.[10][11] Havo kuchlarining parvozlar dinamikasi laboratoriyasi, to'g'ri qanotli dizayn qayta kirish paytida yuqori issiqlik va aerodinamik stresslarga dosh berolmaydi va kerakli intervalgacha qobiliyatini ta'minlay olmaydi, deb ta'kidladi. Bundan tashqari, havo kuchlari Faget dizayni ruxsat berganidan kattaroq yuk ko'tarish qobiliyatini talab qildilar. 1971 yil yanvar oyida NASA va Harbiy havo kuchlari rahbariyati, sarflanadigan yoqilg'i quyish tankiga o'rnatiladigan delta qanotli qayta ishlatilishi mumkin bo'lgan orbiter "Space Shuttle" uchun eng maqbul dizayn deb qaror qildi.[6]:166

Ular qayta foydalanishga yaroqli, og'ir yuk ko'taradigan kosmik kemaga ehtiyoj sezgandan so'ng, NASA va Havo kuchlari o'zlarining xizmatlarining dizayn talablarini aniqladilar. Havo kuchlari Space sun'iy yo'ldoshidan katta sun'iy yo'ldoshlarni uchirish uchun foydalanadi deb kutgan va undan 29000 kg (65000 lb) sharqiy LEO ga yoki 18000 kg (40000 lb) ko'tarish imkoniyatiga ega bo'lishni talab qilgan. qutb orbitasi. Sun'iy yo'ldosh dizaynlari, shuningdek, "Space Shuttle" ning 4,6 x 18 m (15 x 60 fut) foydali yuk maydonchasiga ega bo'lishini talab qildi. NASA buni baholadi F-1 va J-2 dan dvigatellar Saturn raketalari va ular "Space Shuttle" talablari uchun etarli emasligini aniqladilar; 1971 yil iyul oyida u bilan shartnoma tuzdi Rocketdyne da rivojlanishni boshlash RS-25 dvigatel.[6]:165–170

NASA "Space Shuttle" ning 29 ta potentsial dizaynini ko'rib chiqdi va ikkita yon kuchaytirgichli dizayndan foydalanish kerakligini va kuchaytirish moslamalari xarajatlarni kamaytirish uchun qayta ishlatilishi kerakligini aniqladi.[6]:167 NASA va havo kuchlari foydalanishga saylandi qattiq qo'zg'atuvchi kuchaytirgichlar chunki ular okeanga tushgandan keyin arzonroq xarajatlar va ularni qayta ishlatish uchun qayta tiklash qulayligi. 1972 yil yanvarda Prezident Richard Nikson Shuttle-ni tasdiqladi va NASA mart oyida uning yakuniy dizayni to'g'risida qaror qabul qildi. O'sha avgust oyida NASA orbiterni qurish uchun Shimoliy Amerika Rokvellga shartnoma imzoladi. Morton Thiokol va tashqi tank qisqaradi Martin Marietta.[6]:170–173

Rivojlanish

Qurilish bosqichida bo'lgan Kolumbiya kosmik kemasi
Kolumbiya uning keramik plitalarini o'rnatish ishlari olib borilmoqda

1974 yil 4-iyunda Rokvell birinchi orbitada OV-101 qurilmasini boshladi, keyinchalik u nomi berildi Korxona. Korxona sinov vositasi sifatida ishlab chiqilgan va dvigatellarni yoki issiqlik himoyasini o'z ichiga olmaydi. Qurilish 1976 yil 17 sentyabrda yakunlandi va Korxona ga ko'chirildi Edvards havo kuchlari bazasi sinovni boshlash.[6]:173[12] Rokvell qurilgan Asosiy harakatlantiruvchi sinov maqolasi (MPTA) -098, bu uchta RS-25 dvigatellari bilan ETga o'rnatilgan konstruktsion truss edi. Bu sinovdan o'tkazildi Milliy kosmik texnologiyalar laboratoriyasi (NSTL) dvigatellarning ishga tushirish profilidan xavfsiz ishlashini ta'minlash.[13]:II-163 Rokvell ishga tushirish va qayta kirish paytida aerodinamik va termal stresslarning ta'sirini aniqlash uchun Structural Test Article (STA) -099-da mexanik va termal stress sinovlarini o'tkazdi.[13]:I-415

RS-25 kosmik kemaning asosiy dvigatelini yaratish boshlanishi to'qqiz oyga kechiktirildi Pratt va Uitni Rocketdyne-ga berilgan shartnomani rad etdi. Birinchi dvigatel 1975 yil mart oyida, birinchi gaz bosadigan, qayta ishlatiladigan dvigatelni ishlab chiqarish bilan bog'liq muammolardan so'ng tugallandi. Dvigatelni sinovdan o'tkazishda RS-25 shtutserida bir nechta nosozliklar, shuningdek, turbinaning pichoqlari singan. Sinov paytida muammolarga qaramay, NASA 1978 yil may oyida qurilayotgan uchta orbitaga zarur bo'lgan to'qqizta RS-25 dvigatelga buyurtma berdi.[6]:174–175

NASA Space Shuttle kemasini ishlab chiqishda sezilarli kechikishlarga duch keldi termal himoya qilish tizimi. Avvalgi NASA kosmik kemasi ishlatilgan ablativ issiqlik qalqonlari, ammo ularni qayta ishlatish mumkin emas edi. NASA termal himoya qilish uchun keramik plitkalardan foydalanishni tanladi, chunki shutl keyinchalik engil vaznda qurilishi mumkin edi alyuminiy va kerak bo'lganda plitkalarni alohida-alohida almashtirish mumkin. Qurilish boshlandi Kolumbiya 1975 yil 27 martda va 1979 yil 25 martda KSCga etkazib berildi.[6]:175–177 KSCga kelganida, Kolumbiya hali o'rnatilishi kerak bo'lgan 30000 plitkasidan 6000 tasi qolgan edi. Shu bilan birga, dastlab o'rnatilgan ko'plab plitkalarni almashtirish kerak edi, bundan oldin ikki yil o'rnatilishi kerak edi Kolumbiya uchishi mumkin edi.[8]:46–48

1979 yil 5-yanvarda NASA ikkinchi orbitani ishga tushirdi. O'sha oyning oxirida Rokvell STA-099 ni keyinchalik nomi berilgan OV-099 ga o'zgartira boshladi CHellenjer. 1979 yil 29 yanvarda NASA OV-103 va OV-104 nomli ikkita qo'shimcha orbitaga buyurtma berdi. Kashfiyot va Atlantis. Keyinchalik nomi berilgan OV-105 qurilishi Harakat qiling, 1982 yil fevralda boshlangan, ammo NASA 1983 yilda Space Shuttle parkini to'rtta orbitaga cheklashga qaror qildi. yo'qotish CHellenjer, NASA ishlab chiqarishni qayta boshladi Harakat qiling 1987 yil sentyabrda.[8]:52–53

Sinov

Shuttle Carrier Aircraft samolyotidan yaqinlashish va qo'nish sinovlari uchun ozod qilinadigan korxona
Korxona davomida Yondashuv va qo'nish sinovlari
Space Shuttle Columbia birinchi kosmik kemani uchirmoqda
Kolumbiya ishga tushirish STS-1[b]

Edvards AFBga etib kelganidan so'ng, Korxona bilan parvoz sinovlaridan o'tkazildi Shuttle Carrier Aircraft, orbitani tashish uchun o'zgartirilgan Boeing 747. 1977 yil fevral oyida, Korxona boshladi Yondashuv va qo'nish sinovlari va parvoz davomida Shuttle Carrier Aircraft-ga bog'lanib qolgan tutqun parvozlarni amalga oshirdi. 1977 yil 12 avgustda, Korxona birinchi sirpanish sinovini o'tkazdi, u erda Shuttle Carrier Aircraft-dan ajralib, Edvards AFBga tushdi.[6]:173–174 To'rtta qo'shimcha reysdan so'ng, Korxona ga ko'chirildi Marshall kosmik parvoz markazi (MSFC) 1978 yil 13 martda. Korxona Mated Vertical Ground Vibration Test-da silkitishni sinovlaridan o'tkazdi, u erda u tashqi tankga va qattiq raketa kuchaytirgichlariga ulangan va uchish stresslarini simulyatsiya qilish uchun tebranishlarga duch kelgan. 1979 yil aprelda, Korxona KSCga olib borildi, u erda tashqi tank va qattiq raketa kuchaytirgichlariga ulangan va ko'chib o'tgan LC-39. Ishga tushirish maydonchasiga o'rnatilgandan so'ng, "Space Shuttle" ishga tushirilishi kompleks apparati to'g'ri joylashishini tekshirish uchun ishlatilgan. Korxona 1979 yil avgustda Kaliforniyaga qaytarib olib kelingan va keyinchalik rivojlanishida xizmat qilgan SLC-6 da Vandenberg AFB 1984 yilda.[8]:40–41

1980 yil 24-noyabrda, Kolumbiya tashqi tanki va qattiq raketa kuchaytirgichlari bilan bog'langan va 29 dekabrda LC-39 ga ko'chirilgan.[13]:III-22 Space Shuttle birinchi missiyasi, STS-1, NASA birinchi marta kosmik kemaning birinchi parvozini amalga oshirishi mumkin edi.[13]:III-24 1981 yil 12 aprelda "Kosmik Shuttle" birinchi marta uchirildi va uni boshqargan Jon Young va Robert Krippen. Ikki kunlik topshiriq davomida Young va Crippen shutlda jihozlarni sinovdan o'tkazdilar va bir nechta keramik plitalarning yuqori qismidan qulab tushganligini aniqladilar. Kolumbiya.[14]:277–278 NASA Havo kuchlari bilan muvofiqlashtirilgan bo'lib, uning pastki qismini tasvirlash uchun sun'iy yo'ldoshlardan foydalanish Kolumbiyava zarar yo'qligini aniqladi.[14]:335–337 Kolumbiya atmosferani qayta ko'rib chiqdi va 14-aprel kuni Edvards AFB-ga qo'ndi.[13]:III-24

NASA bilan uchta qo'shimcha sinov parvozi amalga oshirildi Kolumbiya 1981 va 1982 yillarda. 1982 yil 4 iyulda, STS-4, uchib ketgan Ken Mattingli va Genri Xarsfild, Edvards AFB-da beton uchish-qo'nish yo'lagiga tushdi. Prezident Ronald Reygan va uning rafiqasi Nensi ekipaj bilan uchrashdi va nutq so'zladi. STS-4 dan keyin NASA o'zining kosmik transport tizimi (STS) ishini e'lon qildi.[6]:178–179[15]

Tavsif

Space Shuttle birinchi orbitali kosmik kemasi bo'lgan qayta ishlatmoq. Har bir Space Shuttle orbiteri 100 marta uchirish yoki o'n yillik ekspluatatsiya muddatiga mo'ljallangan edi, ammo keyinchalik bu uzaytirildi.[16]:11 Ishga tushirish paytida u quyidagilardan iborat edi orbita o'z ichiga olgan ekipaj va foydali yuk, tashqi tank (ET) va ikkalasi qattiq raketa kuchaytirgichlari (SRB).[17]:363

Shuttle komponentlari uchun javobgarlik ko'plab NASA dala markazlari orasida tarqaldi. KSC ekvatorial orbitalar uchun uchish, qo'nish va burilish operatsiyalari uchun mas'ul bo'lgan (dasturda amalda ishlatiladigan yagona orbitali profil), AQSh havo kuchlari Vandenberg aviabazasi qutbli orbitalar uchun uchirish, qo'nish va burilish operatsiyalari uchun javobgar edi (garchi bu hech qachon ishlatilmagan bo'lsa ham) Jonson kosmik markazi (OAJ) Shuttle operatsiyalari uchun markaziy nuqta bo'lib xizmat qildi, MSFC asosiy dvigatellar, tashqi tank va qattiq raketa kuchaytirgichlari uchun javobgardir. John C. Stennis kosmik markazi boshqariladigan asosiy dvigatel sinovlari va Goddard kosmik parvoz markazi global kuzatuv tarmog'ini boshqargan.[18]

Orbiter

Asosiy maqola: Space Shuttle orbiteri
Shuttleni ishga tushirish rejimlari. Chapdan: Kolumbiya, CHellenjer, Kashfiyot, Atlantis va Harakat qiling

Orbiterda vertikal ravishda uchib, keyin planer sifatida qo'nishga imkon beradigan raketa va samolyotning dizayn elementlari va imkoniyatlari mavjud edi.[17]:365 Uning uch qismli fyuzelyaji ekipaj bo'linmasi, yuklar uchun joy, parvoz yuzalari va dvigatellarni qo'llab-quvvatladi. Orbiterning orqa qismida fazoviy shuttle asosiy dvigatellari (SSME) joylashgan bo'lib, ular uchish paytida harakatlanishni ta'minladilar, shuningdek, orbitaga kosmosda bir marta erishish, o'zgartirish va chiqish imkoniyatini beradigan Orbital Manevr Tizimi (OMS) mavjud edi. Ikki baravardelta qanotlari uzunligi 18 m (60 fut) bo'lgan va ichki etakchasida 81 °, tashqi chetida 45 ° siljigan. Har bir qanotning ichki va tashqi tomoni bor edi elevon nazorat qilish uchun dvigatellar ostida, qanotlari o'rtasida joylashgan qopqoq bilan birga, qayta kirish paytida parvozni boshqarishni ta'minlash balandlik. Orbiter vertikal stabilizator 45 ° da orqaga siljigan va tarkibida a rul sifatida harakat qilish uchun bo'linishi mumkin tez tormozlash.[17]:382–389 Vertikal stabilizatorda ikkita qism ham bo'lgan parashyutni torting tushgandan keyin orbitani sekinlashtiradigan tizim. Amaldagi orbita orqaga tortiladigan qo'nish moslamasi har biri ikkita shinani o'z ichiga oladigan burunli qo'nish moslamasi va ikkita asosiy qo'nish moslamasi bilan. Asosiy tushirish moslamasida ikkitadan tormoz moslamasi, burun tushirish moslamasida esa elektr gidravlik boshqarish mexanizmi mavjud edi.[17]:408–411

Ekipaj

Space Shuttle ekipaji har bir topshiriq bo'yicha har xil edi. Sinov parvozlarida faqat ikkitadan a'zosi bor edi, ular qo'mondon va uchuvchi edi, ular ikkalasi ham orbitaga ucha oladigan va qo'nadigan malakali uchuvchilar edi. Eksperimentlar, foydali yuklarni tarqatish va EVA kabi orbitadagi operatsiyalar, birinchi navbatda, maqsadlari va tizimlari uchun maxsus o'qitilgan missiya mutaxassislari tomonidan amalga oshirildi. Space Shuttle dasturining boshida NASA foydali yuklarni ko'tarish bo'yicha mutaxassislar bilan uchgan, ular odatda yukni joylashtirish yoki operatsiyalar uchun kompaniyada ishlaydigan tizim mutaxassislari bo'lgan. Oxirgi foydali yuk mutaxassisi, Gregori B. Jarvis, uchib ketdi STS-51-L va kelajakda uchuvchisiz uchuvchilar missiya mutaxassisi sifatida tayinlandi. Astronavt ikkalasida ham ekipaj kosmik parvoz muhandisi sifatida uchdi STS-51-C va STS-51-J a uchun harbiy vakil bo'lib xizmat qilish Milliy razvedka idorasi foydali yuk. Space Shuttle ekipajida odatda etti astronavt bor edi STS-61-A sakkiz bilan uchish.[13]:III-21

Ekipaj bo'limi

Ekipaj xonasi uchta kemadan iborat bo'lib, Space Shuttle-ning barcha missiyalarida bosim ostida, yashash uchun qulay joy edi. Uchish maydonchasi qo'mondon va uchuvchi uchun ikkita o'rindiqdan, shuningdek ekipaj a'zolari uchun qo'shimcha ikki-to'rt o'rindan iborat edi. O'rta pastki samolyot uchish maydonchasi ostida joylashgan bo'lib, u erda gale va ekipaj to'shaklari, shuningdek uch yoki to'rtta ekipaj a'zolari o'rindiqlari o'rnatildi. O'rtacha pastki qismida ikkita astronavtni qo'llab-quvvatlaydigan havo qulfi mavjud edi ekstravekulyar faoliyat (EVA), shuningdek, bosimli tadqiqot modullariga kirish. Atrof-muhit nazorati va chiqindilarni boshqarish tizimlari saqlanadigan uskunalar maydonchasi o'rtaning pastki qismida joylashgan.[8]:60–62[17]:365–369

Dastlabki to'rtta Shuttle missiyasida kosmonavtlar AQSh havo kuchlarining o'zgartirilgan yuqori balandlikdagi to'liq bosimli kostyumlarini kiyib yurishdi, ular ko'tarilish va tushish paytida to'liq bosimli zarbdan iborat edi. Beshinchi parvozdan, STS-5, yo'qolgunga qadar CHellenjer, ekipaj bir qismli ochiq ko'k rangda edi nomex parvoz kostyumlari va qisman bosimli dubulg'alar. Keyin CHellenjer ofat, ekipaj a'zolari dubulg'ali yuqori balandlikdagi bosim kostyumlarining qisman bosimli versiyasi - Launch Entry Suit (LES) ni kiyishdi. 1994 yilda LES to'liq bosim bilan almashtirildi Advanced Crew Escape Suit (ACES), bu favqulodda vaziyatda astronavtlarning xavfsizligini yaxshilagan. Kolumbiya dastlab o'zgartirilgan edi SR-71 noldan nolga chiqaradigan o'rindiqlar ALT va birinchi to'rtta missiya uchun o'rnatildi, ammo STS-4dan keyin o'chirib qo'yildi va keyin olib tashlandi STS-9.[17]:370–371

Atlantis kokpitidan orbitada bo'lgan ko'rinish
Atlantis a bilan parvoz qilgan birinchi Shuttle edi shisha kokpit, kuni STS-101.

Parvoz kemasi ekipaj bo'linmasining eng yuqori darajasi bo'lib, orbitaga uchish boshqaruvini o'z ichiga olgan. Qo'mondon oldingi chap o'rindiqqa, uchuvchi esa oldingi o'ng o'rindiqqa o'tirdi, qo'shimcha ekipaj a'zolari uchun ikkitadan to'rttagacha qo'shimcha joylar o'rnatildi. Ko'rsatkich panellarida 2100 dan ortiq displey va boshqaruv mavjud bo'lib, qo'mondon va uchuvchi ikkalasi ham jihozlangan bosh ekrani (HUD) va a Aylanadigan qo'l boshqaruvchisi (RHC) ga gimbal quvvatli parvoz paytida dvigatellar va kuchsiz parvoz paytida orbitada uchib yurishadi. Ikkala o'rindiq ham bor edi rul uchish va rulni erga burish paytida rul harakatlanishini ta'minlash uchun boshqaruv elementlari.[17]:369–372 Dastlab orbitadagi transport vositalari ko'p funktsiyali o'rnatilgan CRT Displey tizimi (MCDS) parvoz ma'lumotlarini ko'rsatish va boshqarish uchun. MCDS parvoz ma'lumotlarini qo'mondon va uchuvchilar o'rindiqlarida, shuningdek orqada o'tirgan joylarda namoyish qildi va HUD ma'lumotlarini ham nazorat qildi. 1998 yilda, Atlantis a bo'lgan Ko'p funktsiyali elektron displey tizimi (MEDS) bilan yangilandi shisha kokpit sakkizta MCDS displeyini 11 ko'p funktsiyali rangli raqamli ekran bilan almashtirgan parvoz asboblarini yangilash. MEDS birinchi marta 2000 yil may oyida parvoz qildi STS-98 va boshqa orbitadagi transport vositalari unga yangilandi. Samolyotning orqa qismida pastki qismda foydali yuklarni ko'tarish oynasiga qaragan derazalar va shuningdek, ularni boshqarish uchun RHC mavjud edi. Masofaviy manipulyator tizimi yuk operatsiyalari paytida. Bundan tashqari, orqada uchadigan kemada a uchun monitorlar mavjud edi yopiq televizor yuk joyini ko'rish.[17]:372–376

O'rta qavatda ekipaj jihozlarini saqlash joyi, uxlash joyi, oshxona xonasi, tibbiy jihozlar va ekipaj uchun gigiena stantsiyalari mavjud edi. Ekipaj modulli shkaflardan foydalangan holda, ularning ehtiyojlariga qarab kattalashtirilishi mumkin bo'lgan uskunalar hamda doimiy ravishda o'rnatiladigan pol bo'linmalaridan foydalanilgan. O'rtacha pastki qismida ekipaj Yerda bo'lganida kirish va chiqish uchun foydalanadigan port tomonidagi lyuk mavjud edi. Bundan tashqari, har bir orbiter dastlab pastki qavatda ichki havo shkafi bilan o'rnatildi. Ichki havo blokirovkasi yuk ko'tarish joyidagi tashqi havo blokirovkasi bilan almashtirildi Kashfiyot, Atlantisva Harakat qiling bilan joylashtirishni yaxshilash Mir va ISS bilan birga Orbiterni ulash tizimi.[13]:II – 26–33

Uchish tizimlari

Orbiter an bilan jihozlangan avionika atmosfera parvozi paytida ma'lumot va boshqaruvni ta'minlaydigan tizim. Uning avionik to'plami uchta edi mikroto'lqinli skanerlash nurlarini qo'nish tizimlari, uch giroskoplar, uch TAKANLAR, uch akselerometrlar, ikkitasi radar altimetrlari, ikkitasi barometrik altimetrlar, uch munosabat ko'rsatkichlari, ikkitasi Mach ko'rsatkichlari va ikkitasi Rejim C transponderlar. Qayta kirish paytida ekipaj ikkitasini tarqatdi havo ma'lumoti zondlari bir marta ular Mach 5 ga qaraganda sekinroq sayohat qilmoqdalar. Orbitada uchta bor edi inersial o'lchov birliklari (O'IH) parvozning barcha bosqichlarida ko'rsatma va navigatsiya uchun foydalangan. Orbitada ikkitasi bor yulduz izdoshlari orbitada bo'lgan davrda IMUlarni tekislash uchun. Yulduzli trekerlar orbitada joylashgan bo'lib, yulduzga avtomatik yoki qo'l bilan tekislanishi mumkin. 1991 yilda NASA inertial o'lchov birliklarini an bilan yangilay boshladi inertial navigatsiya tizimi (INS), bu aniqroq joylashuv ma'lumotlarini taqdim etdi. 1993 yilda NASA a GPS bortda birinchi marta qabul qilgich STS-51. 1997 yilda Honeywell birinchi bo'lib parvoz qilgan IMU, INS va TACAN tizimlarini almashtirish uchun integral GPS / INS ishlab chiqara boshladi. STS-118 2007 yil avgustda[17]:402–403

Orbitada bo'lganida, ekipaj asosan to'rt kishidan biri yordamida aloqa o'rnatgan S guruhi ham ovozli, ham ma'lumotlar aloqasini ta'minlovchi radiolar. S.larning ikkitasi radiostantsiyalar mavjud edi o'zgarishlar modulyatsiyasi transmitterlar va ma'lumotlarni uzatishi va qabul qilishi mumkin edi. Qolgan ikkita S radiostantsiyalar mavjud edi chastota modulyatsiyasi transmitterlar va NASA-ga ma'lumotlarni uzatish uchun ishlatilgan. S sifatida tarmoqli radioeshittirishlar faqat ularning ichida ishlaydi ko'rish chizig'i, NASA ishlatilgan Sun'iy yo'ldosh tizimini kuzatish va ma'lumotlar uzatish va Kosmik kemalarni kuzatish va ma'lumotlarni yig'ish tarmog'i orbitada butun orbitada aloqa qilish uchun er stantsiyalari. Bundan tashqari, orbitachi yuqori o'tkazuvchanlik qobiliyatini tarqatdi Ksiz guruh radioeshittirish vositasi, shuningdek, radar sifatida ishlatilishi mumkin. Shuningdek, orbitaga ikkita moslama o'rnatilgan edi UHF bilan aloqa qilish uchun radiolar havo harakatini boshqarish va EVA o'tkazadigan kosmonavtlar.[17]:403–404

Orbitada ishlatiladigan ikkita kompyuter
AP-101S (chapda) va AP-101B umumiy foydalanish uchun mo'ljallangan kompyuterlar

Kosmik Shuttle sim bilan uchish boshqaruv tizimi to'liq uning asosiy kompyuteriga, Ma'lumotlarni qayta ishlash tizimiga (DPS) bog'liq edi. DPS orbitadagi parvozlarni boshqarish va surish moslamalarini, shuningdek, parvoz paytida ET va SRBlarni boshqargan. DPS tarkibiga beshta umumiy kompyuter (GPC), ikkita magnit lentali massa xotira birligi (MMU) va Space Shuttle komponentlarini nazorat qilish uchun tegishli sensorlar kirgan.[17]:232–233 Ishlatilgan asl GPC IBM edi AP-101B, alohida ishlatilgan markaziy protsessor (CPU) va kirish / chiqish protsessori (IOP) va o'zgaruvchan emas qattiq holatdagi xotira. 1991 yildan 1993 yilgacha orbitadagi transport vositalari AP-101S ga yangilandi, bu xotira va qayta ishlash imkoniyatlarini yaxshilab, protsessor va IOPni bitta birlikka birlashtirish orqali kompyuterlarning hajmi va og'irligini kamaytirdi. GPClarning to'rttasida "Avionics" dasturiy ta'minotining birlamchi tizimi (PASS) o'rnatilgan bo'lib, u parvozning barcha bosqichlarida nazoratni ta'minlovchi "Space Shuttle" ga tegishli dasturiy ta'minot edi. Ko'tarilish, manevr qilish, qayta kirish va qo'nish paytida to'rtta PASS GPC to'rt baravar ortiqcha ishlab chiqarish uchun bir xil ishladilar va natijalarini tekshirishda xatolikka yo'l qo'yishdi. Agar to'rtta PASS GPC-dan xato xabarlarni keltirib chiqaradigan dasturiy ta'minotda xato bo'lsa, beshinchi GPC boshqa dasturdan foydalangan va ko'tarilish, orbitada va qayta kirish orqali Space Shuttle-ni boshqarishi mumkin bo'lgan zaxira parvoz tizimini boshqargan, ammo butun missiya. Sovutish foniy ishlamay qolganda ortiqcha ish bilan ta'minlash uchun beshta GPC o'rta qavatdagi uchta alohida maydonchada ajratildi. Orbitaga erishgandan so'ng, ekipaj operatsion missiyani qo'llab-quvvatlash uchun ba'zi GPC funktsiyalarini boshqarish, navigatsiya va boshqarish (GNC) dan tizimlarni boshqarish (SM) va foydali yuk (PL) ga o'tkazadi.[17]:405–408 Space Shuttle parvozi dekabrdan yanvargacha davom etadigan bo'lsa, ishga tushirilmadi, chunki uning parvozi dasturiy ta'minot orbitadagi transport vositasining kompyuterlari yil o'zgarishiga qarab qayta tiklanishini talab qilishi kerak edi. 2007 yilda NASA muhandislari "Space Shuttle" parvozlari yil oxiriga qadar chegarani kesib o'tishlari uchun echim ishlab chiqdilar.[19]

Space Shuttle missiyalari odatda orbitadagi transport vositasi kompyuterlari va aloqa to'plami bilan birlashadigan, shuningdek ilmiy va foydali yuklarni kuzatadigan portativ umumiy qo'llab-quvvatlovchi kompyuterni (PGSC) olib kelishdi. Dastlabki missiyalar Grid kompas, PGSC kabi birinchi noutbuk kompyuterlaridan biri, ammo keyinchalik vazifalar keltirildi olma va Intel noutbuklar.[17]:408[20]

Yuk ko'taradigan joy

Xabbl kosmik teleskopi yuk ko'tarish zonasida bo'lganida EVA o'tkazayotgan astronavt
Musgreyv haqida hikoya xizmat ko'rsatuvchi RMSga biriktirilgan Hubble kosmik teleskopi davomida STS-61

Yuk ko'tarish zonasi orbitadagi transport vositalarining katta qismini tashkil etdi fyuzelyaj va "Space Shuttle" ning foydali yuklari uchun yuk tashish joyini ta'minladi. Uning uzunligi 18 m (60 fut) va kengligi 4,6 m (15 fut) bo'lgan va diametri 4,6 m (15 fut) gacha bo'lgan silindrli yuklarni o'z ichiga olgan. Ko'rfazning har ikki tomoniga ikkita yuk ko'taruvchi eshik eshiklari osilgan va ishga tushirish va qayta kirish paytida foydali yuklarni isitishdan himoya qilish uchun nisbatan havo o'tkazmaydigan muhr bilan ta'minlangan. Yuk ko'tarish joylari yuk ko'tarish joyida biriktiriladigan joylarga o'rnatildi longons. Yuk ko'taruvchi eshik eshiklari orbitadagi transport vositasining issiqligi uchun radiator sifatida qo'shimcha funktsiyani bajargan va issiqlikni rad etish uchun orbitaga chiqqandan keyin ochilgan.[8]:62–64

Orbiter missiyadan kelib chiqqan holda turli xil qo'shimcha komponentlar bilan birgalikda ishlatilishi mumkin. Bunga orbital laboratoriyalar,[13]:II-304, 319 foydali yuklarni kosmosga uzoqroqqa uchirish uchun kuchaytirgichlar,[13]:II-326 Masofaviy manipulyator tizimi (RMS),[13]:II-40 va missiya muddatini uzaytirish.[13]:II-86 Orbiter XKSga ulangan paytda yonilg'i sarfini cheklash uchun Stantsiyadan Shuttlegacha elektr uzatish tizimi (SSPTS) stantsiya quvvatini orbitaga o'tkazish va uzatish uchun ishlab chiqilgan.[13]:II-87-88 SSPTS birinchi marta STS-118da ishlatilgan va o'rnatilgan Kashfiyot va Harakat qiling.[13]:III-366-368

Masofaviy manipulyator tizimi
Asosiy maqola: Kanadarm

Masofaviy manipulyator tizimi (RMS), shuningdek Canadarm deb nomlanuvchi, yuk tashish joyiga bog'langan mexanik qo'l edi. U foydali yuklarni tushunish va boshqarish uchun ishlatilishi mumkin, shuningdek, EVA o'tkazadigan kosmonavtlar uchun mobil platforma bo'lib xizmat qilishi mumkin. RMS kanadalik kompaniya tomonidan qurilgan Spar Aerospace va orbitaning parvoz maydonchasi ichida derazalari va yopiq televizorlari yordamida kosmonavt tomonidan boshqarilgan. RMS oltita erkinlik darajasiga ega edi va qo'lning uchta nuqtasida joylashgan oltita bo'g'in bor edi. Dastlabki RMS 29000 kg (65000 funt) gacha bo'lgan yuklarni joylashtirishi yoki qabul qilishi mumkin edi, keyinchalik 270,000 kg (586,000 funt) ga yaxshilandi.[17]:384–385

Spacelab
Asosiy maqola: Spacelab
Spacelab orbitada bo'lganida foydali yuk maydonchasida
Spacelab orbitada STS-9

Spacelab moduli Evropa tomonidan moliyalashtirilgan bosimli laboratoriya bo'lib, u yuk ko'tarish zonasida olib borilgan va orbitada bo'lganida ilmiy tadqiqotlar o'tkazishga imkon bergan. Spacelab moduli parvoz paytida tortishish markazini saqlab qolish uchun foydali yuk tashuvchi qismning orqa uchiga o'rnatilgan 2,7 m (9 fut) ikkita segmentni o'z ichiga olgan. Astronavtlar Spacelab moduliga havo blokiga ulangan 2,7 m (8,72 fut) yoki 5,8 m (18,88 fut) tunnel orqali kirishdi. Spacelab uskunalari asosan poddonlarda saqlanar edi, bu ikkala tajribani ham, kompyuter va quvvat uskunalarini ham saqlashni ta'minladi.[17]:434–435 Spacelab apparati 1999 yilgacha 28 ta missiyada uchgan va astronomiya, mikrogravitatsiya, radar va hayot haqidagi fanlarni o'z ichiga olgan. Spacelab apparati, shuningdek, Hubble Space Telescope (HST) xizmat ko'rsatish va kosmik stantsiyani zaxira qilish kabi vazifalarni qo'llab-quvvatladi. Spacelab moduli STS-2 va STS-3 sinovlaridan o'tkazildi va birinchi to'liq missiya STS-9da bo'lgan.[21]

RS-25 dvigatellari

Asosiy maqola: RS-25
Orbiterning orqa qismida joylashgan ikkita dvigatel tizimi
RS-25 ikkita dvigatel Orbital manevr tizimi (OMS) podkastlar

Uchta RS-25 dvigatellari, shuningdek, Space Shuttle asosiy dvigatellari (SSME) deb nomlanuvchi, uchburchak shaklda orbitaning orqa fyuzelyajiga o'rnatildi. Dvigatelning nozullari balandlikda ± 10,5 ° va ± 8,5 ° gacha gimbal bo'lishi mumkin yaw Shuttle-ni boshqarish uchun harakat yo'nalishini o'zgartirish uchun ko'tarilish paytida. The titanium qotishmasi qayta ishlatiladigan dvigatellar orbitadagi transport vositasidan mustaqil bo'lib, parvozlar oralig'ida olib tashlanib, almashtirilishi kerak edi. RS-25 - bu suyuq kislorod va vodorod ishlatilgan va oldingi suyuq raketalarga qaraganda yuqori kamerali bosimga ega bo'lgan bosqichma-yonish tsikli kriyogen dvigatel. Dastlabki asosiy yonish kamerasi maksimal 226,5 bar (3285 psi) bosim ostida ishladi. Dvigatelning nozuli balandligi 287 sm (113 dyuym) va ichki diametri 229 sm (90,3 dyuym). Suyuqlik vodorodni tashuvchi 1080 ta ichki chiziq bilan sovutiladi va izolyatsion va ablativ materiallar bilan termal himoyalangan.[13]:II – 177–183

RS-25 dvigatellari ishonchliligi va quvvatini oshirish uchun bir nechta takomillashtirilgan. Rocketdyne ishlab chiqish dasturi davomida dvigatel xavfsizligini ishonchli ishlashga qodir ekanligini aniqladi. Dvigatelning tortishish qiymatlarini avvalgi hujjatlar va dasturiy ta'minotga mos kelishini ta'minlash uchun NASA dastlabki belgilangan quvvatni 100% ushlab turdi, ammo RS-25 yuqori bosim ostida ishladi. RS-25 yangilanish versiyalari I blok va II blok deb belgilandi. Block II dvigatellari bilan 2001 yilda 109% surish darajasiga erishildi, bu kameraning bosimini 207,5 barga (3,010 psi) tushirdi, chunki u kattaroq edi tomoq maydon. Oddiy maksimal gaz kelebeği 104 foizni tashkil etdi, 106% yoki 109% missiyani to'xtatish uchun ishlatilgan.[8]:106–107

Orbital manevr tizimi

Asosiy maqola: Space Shuttle orbital manevr tizimi

Orbital manevr tizimi (OMS) orqaga o'rnatilgan ikkita narsadan iborat edi AJ10-190 dvigatellar va unga bog'liq bo'lgan yoqilg'i tanklari. Ishlatilgan AJ10 dvigatellari monometilhidrazin (MMH) tomonidan oksidlanadi tetroksidi dinitrogen (N2O4). Dukkaklilar maksimal 2140 kg (4,718 funt) MMH va 3,526 kg (7,773 funt) N tashiydi.2O4. OMS dvigatellari dvigatelning asosiy kesilishidan (MECO) keyin orbital kiritish uchun ishlatilgan. Parvoz davomida ular orbitani o'zgartirish uchun ishlatilgan, shuningdek deorbit qayta kirishdan oldin yonib ketgan. Har bir OMS dvigateli 27,080 N (6,087 lbf) tortish kuchini hosil qildi va butun tizim 305 m / s (1000 fut / s) tezlikni o'zgartirish.[13]:II – 80

Issiqlikdan himoya qilish tizimi

Asosiy maqola: Space Shuttle termal himoya qilish tizimi

Orbiter qayta kirish paytida issiqlikdan himoyalangan, issiqlik muhofaza qilish tizimi (TPS), a termal emdirish orbitaning atrofidagi himoya qatlami. Ablativ issiqlik qalqonlaridan foydalangan AQShning avvalgi kosmik kemalaridan farqli o'laroq, orbitaning qayta ishlatilishi uchun ko'p marta ishlatiladigan issiqlik himoyasi kerak edi.[8]:72–73 Qayta kirish paytida TPS 1600 ° C (3000 ° F) gacha bo'lgan haroratni boshdan kechirdi, ammo orbitadagi avtomobilning alyuminiy terisi harorati 180 ° C (350 ° F) dan past bo'lishi kerak edi. TPS asosan to'rt turdagi plitkalardan iborat edi. Burun konuslari va qanotlarning etakchi qirralari 1300 ° C (2300 ° F) dan yuqori haroratni boshdan kechirgan va kuchaytirilgan uglerod-uglerod plitalari (RCC) bilan himoyalangan. Qalinligi kattaroq RCC plitalari 1998 yilda ishlab chiqarilib, shikastlanishiga yo'l qo'ymaslik uchun o'rnatildi mikrometeoroid va orbital qoldiqlar, va RCC ning zararlanishidan keyin yanada yaxshilandi Kolumbiya falokat. Boshlash STS-114, orbiter transport vositalari ekipajni har qanday mumkin bo'lgan shikastlanishlar to'g'risida ogohlantirish uchun qanotlarning etakchi ta'sirini aniqlash tizimi bilan jihozlangan.[13]:II – 112–113 Orbitadagi transport vositasining butun pastki qismi, shuningdek, eng issiq yuzalar yuqori haroratda qayta ishlatiladigan sirt izolyatsiyasi bilan himoyalangan. Orbiter transport vositasining yuqori qismidagi joylar oq past haroratli qayta ishlatilishi mumkin bo'lgan sirt izolyatsiyasi bilan qoplangan, bu esa 650 ° C (1200 ° F) dan past haroratni himoya qiladi. Yuk ko'taruvchi eshik eshiklari va yuqori qanotli sirtlarning qismlari qayta ishlatilishi mumkin bo'lgan namat yuzasi izolyatsiyasi bilan qoplangan, chunki u erda harorat 370 ° C (700 ° F) dan past bo'lgan.[17]:395

Tashqi tank

Asosiy maqola: Space Shuttle tashqi tanki
Ajratishdan keyin tashqi tank orbitasidan ko'rinish
Ajratishdan keyin tashqi tank STS-29

Space Shuttle tashqi tanki (ET) Space Shuttle asosiy dvigatellari uchun yoqilg'ini tashiydi va orbitadagi transport vositasini qattiq raketa kuchaytirgichlari bilan bog'laydi. ET balandligi 47 m (153,8 fut) va diametri 8,4 m (27,6 fut) bo'lgan va suyuq kislorod (LOX) va suyuq vodorod (LH) uchun alohida rezervuarlarni o'z ichiga olgan.2). LOX tanki ET burun qismida joylashgan va uning bo'yi 15 m (49,3 fut) bo'lgan. LH2 ETning asosiy qismini tashkil etgan va uning balandligi 29 m (96,7 fut) bo'lgan. Orbiter transport vositasi ETga ikkita kindik plastinkasida biriktirildi, unda beshta qo'zg'atuvchi va ikkita elektr kindik va oldinga va orqaga tizimli qo'shimchalar mavjud edi. ET tashqi tomoni ko'tarilish issiqligidan omon qolish uchun apelsin purkagichli ko'pik bilan qoplangan.[17]:421–422

ET kosmos shuttle asosiy dvigatellarini ko'tarilgandan asosiy dvigatel to'xtaguniga qadar yoqilg'ini ta'minladi. ET dvigatelning uzilishidan 18 soniyadan so'ng orbitadagi transport vositasidan ajralib chiqdi va avtomatik yoki qo'lda ishga tushirilishi mumkin. Ajratish vaqtida orbita vositasi kindik plitalarini tortib oldi va orbital vositaga ortiqcha qo'zg'atuvchining tushishini oldini olish uchun kindik ichakchalari muhrlandi. Strukturaviy qo'shimchalarga biriktirilgan murvatlar qirqilganidan so'ng, ET orbita vositasidan ajralib chiqdi. Ajratish vaqtida gazli kislorod burundan chiqarilib, ET ning qulab tushishiga olib keldi va qayta kirishda parchalanishini ta'minladi. ET Space Shuttle tizimining qayta ishlatilmaydigan yagona asosiy komponenti bo'lib, u ballistik traektoriya bo'ylab Hind yoki Tinch okeaniga boradi.[17]:422

Dastlabki ikkita topshiriq uchun STS-1 va STS-2, ET ultrabinafsha nurlanishidan himoya qilish uchun 270 kg (595 lb) oq yong'inga qarshi lateks bo'yoq bilan qoplangan. Keyingi tadqiqotlar shuni ko'rsatdiki, ko'pikning o'zi etarli darajada himoyalangan va ET endi STS-3 dan boshlab lateks bo'yoq bilan qoplanmagan.[13]:II-210 Dastlab STS-6-da engil vaznli tank (LWT) uchirilgan, bu tank og'irligini 4700 kg (10,300 funt) ga kamaytirgan. The LWT's weight was reduced by removing components from the LH2 tank and reducing the thickness of some skin panels.[17]:422 In 1998, a super light-weight ET (SLWT) first flew on STS-91. The SLWT used the 2195 aluminum-lithium alloy, which was 40% stronger and 10% less dense than its predecessor, 2219 aluminum-lithium alloy. The SLWT weighed 3,400 kg (7,500 lb) less than the LWT, which allowed the Space Shuttle to deliver heavy elements to ISS's high inclination orbit.[17]:423–424

Qattiq raketa kuchaytirgichlari

Asosiy maqola: Space Shuttle qattiq raketa kuchaytiruvchisi
Tashqi tankga yoki orbitaga ulanmagan ikkita qattiq raketa kuchaytirgichi
Two SRBs on the mobile launcher platform prior to mating with the ET and orbiter

The Solid Rocket Boosters (SRB) provided 71.4% of the Space Shuttle's thrust during liftoff and ascent, and were the largest solid-propellant motors har doim uchib ketgan.[22] Each SRB was 45 m (149.2 ft) tall and 3.7 m (12.2 ft) wide, weighed 68,000 kg (150,000 lb), and had a steel exterior approximately 13 mm (.5 in) thick. The SRB's subcomponents were the solid-propellant motor, nose cone, and rocket nozzle. The solid-propellant motor comprised the majority of the SRB's structure. Its casing consisted of 11 steel sections which made up its four main segments. The nose cone housed the forward separation motors and the parachute systems that were used during recovery. The rocket nozzles could gimbal up to 8° to allow for in-flight adjustments.[17]:425–429

The rocket motors were each filled with a total 500,000 kg (1,106,640 lb) of solid rocket propellant, and joined together in the Avtomobillarni yig'ish binosi (VAB) at KSC.[17]:425–426 In addition to providing thrust during the first stage of launch, the SRBs provided structural support for the orbiter vehicle and ET, as they were the only system that was connected to the mobil ishga tushirish platformasi (MLP).[17]:427 At the time of launch, the SRBs were armed at T-5 minutes, and could only be electrically ignited once the RS-25 engines had ignited and were without issue.[17]:428 They each provided 12,500 kN (2,800,000 lbf) of thrust, which was later improved to 13,300 kN (3,000,000 lbf) beginning on STS-8.[17]:425 After expending their fuel, the SRBs were o'tqazilgan approximately two minutes after launch at an altitude of approximately 46 km (150,000 ft). Following separation, they deployed drogue and main parachutes, landed in the ocean, and were recovered by the crews aboard the ships MV Freedom Star va MV Liberty Star.[17]:430 Once they were returned to Cape Canaveral, they were cleaned and disassembled. The rocket motor, igniter, and nozzle were then shipped to Thiokol to be refurbished and reused on subsequent flights.[8]:124

The SRBs underwent several redesigns throughout the program's lifetime. STS-6 va STS-7 used SRBs that were 2,300 kg (5,000 lb) lighter than the standard-weight cases due to walls that were 0.10 mm (.004 in) thinner, but were determined to be too thin. Subsequent flights until STS-26 used cases that were 0.076 mm (.003 in) thinner than the standard-weight cases, which saved 1,800 kg (4,000 lb). Keyin CHellenjer disaster as a result of an O-ring failing at low temperature, the SRBs were redesigned to provide a constant seal regardless of the ambient temperature.[17]:425–426

Qo'llab-quvvatlaydigan transport vositalari

Qayta tiklangan Solid Rocket Booster bilan tiklanadigan qayiq
MV Freedom Star towing a spent SRB to Cape Canaveral Air Force Station

The Space Shuttle's operations were supported by vehicles and infrastructure that facilitated its transportation, construction, and crew access. The paletli transportyorlar carried the MLP and the Space Shuttle from the VAB to the launch site.[23] The Shuttle Carrier Aircraft (SCA) were two modified Boeing 747 samolyotlari that could carry an orbiter on its back. The original SCA (N905NA) was first flown in 1975, and was used for the ALT and ferrying the orbiter from Edwards AFB to the KSC on all missions prior to 1991. A second SCA (N911NA) was acquired in 1988, and was first used to transport Harakat qiling from the factory to the KSC. Following the retirement of the Space Shuttle, N905NA was put on display at the JSC, and N911NA was put on display at the Joe Davis Heritage Airpark in Palmdeyl, Kaliforniya.[13]:I–377–391[24] The Crew Transport Vehicle (CTV) was a modified airport reaktiv ko'prik that was used to assist astronauts to egress from the orbiter after landing, where they would undergo their post-mission medical checkups.[25] The Astrovan transported astronauts from the crew quarters in the Operations and Checkout Building to the launch pad on launch day.[26] The NASA temir yo'li comprised three locomotives that transported SRB segments from the Florida Sharqiy qirg'oq temir yo'li yilda Titusvill to the KSC.[27]

Missiya profili

Launch preparation

Shuningdek qarang: Space shuttle launch countdown va Space shuttle launch commit criteria
Space Shuttle samolyotni tashuvchi transport vositasida uchirish kompleksiga o'tmoqda
The crawler-transporter with Atlantis on the ramp to LC-39A for STS-117.

The Space Shuttle was prepared for launch primarily in the VAB at the KSC. The SRBs were assembled and attached to the external tank on the MLP. The orbiter vehicle was prepared at the Orbiterni qayta ishlash vositasi (OPF) and transferred to the VAB, where a crane was used to rotate it to the vertical orientation and mate it to the external tank.[8]:132–133 Once the entire stack was assembled, the MLP was carried for 5.6 km (3.5 mi) to Kompleksni ishga tushirish 39 by one of the crawler-transporters.[8]:137 After the Space Shuttle arrived at one of the two launchpads, it would connect to the Fixed and Rotation Service Structures, which provided servicing capabilities, payload insertion, and crew transportation.[8]:139–141 The crew was transported to the launch pad at T−3 hours and entered the orbiter vehicle, which was closed at T−2 soat.[13]:III–8 LOX and LH2 were loaded into the external tank via umbilicals that attached to the orbiter vehicle, which began at T−5 soat 35 daqiqa. At T−3 soat 45 minutes, the LH2 fast-fill was complete, followed 15 minutes later by the LOX. Both tanks were slowly filled up until the launch as the oxygen and hydrogen evaporated.[13]:II–186

The launch commit criteria considered precipitation, temperatures, cloud cover, lightning forecast, wind, and humidity.[28] The Space Shuttle was not launched under conditions where it could have been struck by chaqmoq, as its exhaust plume could have triggered lightning by providing a current path to ground after launch, which occurred on Apollon 12.[29]:239 The NASA Anvil Rule for a Shuttle launch stated that an anvil cloud could not appear within a distance of 19 km (10 nmi).[30] The Shuttle Launch Weather Officer monitored conditions until the final decision to scrub a launch was announced. In addition to the weather at the launch site, conditions had to be acceptable at one of the Transatlantic Abort Landing sites and the SRB recovery area.[28][31]

Ishga tushirish

Space Shuttle asosiy dvigatellari ko'tarilishdan oldin yonmoqda
RS-25 ignition
STS-1 paytida kosmik kemaning ko'tarilishi paytida ajralib chiqadigan SRBlar
Solid rocket booster (SRB) separation during STS-1

The mission crew and the Launch Control Center (LCC) personnel completed systems checks throughout the countdown. Two built-in holds at T−20 minutes and T−9 minutes provided scheduled breaks to address any issues and additional preparation.[13]:III–8 After the built-in hold at T−9 minutes, the countdown was automatically controlled by the Ground Launch Sequencer (GLS) at the LCC, which stopped the countdown if it sensed a critical problem with any of the Space Shuttle's onboard systems.[31] At T−3 daqiqa 45 seconds, the engines began conducting gimbal tests, which were concluded at T−2 daqiqa 15 soniya. The ground launch processing system handed off the control to the orbiter vehicle's GPCs at T−31 soniya. At T−16 seconds, the GPCs armed the SRBs, the sound suppression system (SPS) began to drench the MLP and SRB trenches with 1,100,000 L (300,000 U.S. gal) of water to protect the orbiter vehicle from damage by akustik energy and rocket exhaust reflected from the flame trench and MLP during lift-off.[32][33] At T−10 seconds, hydrogen igniters were activated under each engine bell to quell the stagnant gas inside the cones before ignition. Failure to burn these gases could trip the onboard sensors and create the possibility of an overpressure and explosion of the vehicle during the firing phase. LH2 prevalves were opened at T−9.5 seconds in preparation for engine start.[13]:II–186

Beginning at T−6.6 seconds, the main engines were ignited sequentially at 120-millisecond intervals. All three RS-25 engines were required to reach 90% rated thrust by T−3 seconds, otherwise the GPCs would initiate an RSLS abort. If all three engines indicated nominal performance by T−3 seconds, they were commanded to gimbal to liftoff configuration and the command would be issued to arm the SRBs for ignition at T−0.[34] Between T−6.6 seconds and T−3 seconds, while the RS-25 engines were firing but the SRBs were still bolted to the pad, the offset thrust caused the Space Shuttle to pitch down 650 mm (25.5 in) measured at the tip of the external tank; the 3-second delay allowed the stack to return to nearly vertical before SRB ignition. At T−0, the eight frangible nuts holding the SRBs to the pad were detonated, the final umbilicals were disconnected, the SSMEs were commanded to 100% throttle, and the SRBs were ignited.[35][36] By T+0.23 seconds, the SRBs built up enough thrust for liftoff to commence, and reached maximum chamber pressure by T+0.6 soniya.[37][13]:II–186 At T−0, the JSC Missiyani boshqarish markazi assumed control of the flight from the LCC.[13]:III–9

At T+4 seconds, when the Space Shuttle reached an altitude of 22 meters (73 ft), the RS-25 engines were throttled up to 104.5%. At approximately T+7 seconds, the Space Shuttle rolled to a heads-down orientation at an altitude of 110 meters (350 ft), which reduced aerodynamic stress and provided an improved communication and navigation orientation. Approximately 20−30 seconds into ascent and an altitude of 2,700 meters (9,000 ft), the RS-25 engines were throttled down to 65−72% to reduce the maximum aerodynamic forces at Maks Q.[13]:III–8–9 Additionally, the shape of the SRB propellant was designed to cause thrust to decrease at the time of Max Q.[17]:427 The GPCs could dynamically control the throttle of the RS-25 engines based upon the performance of the SRBs.[13]:II–187

At approximately T+123 seconds and an altitude of 46,000 meters (150,000 ft), pyrotechnic fasteners released the SRBs, which reached an apogee of 67,000 meters (220,000 ft) before parachuting into the Atlantika okeani. The Space Shuttle continued its ascent using only the RS-25 engines. On earlier missions the Space Shuttle remained in the heads-down orientation to maintain communications with the kuzatuv stantsiyasi yilda Bermuda, but later missions, beginning with STS-87, rolled to a heads-up orientation at T+6 minutes for communication with the kuzatuv va ma'lumotlar o'rni sun'iy yo'ldoshi yulduz turkumi. The RS-25 engines were throttled at T+7 daqiqa 30 seconds to limit vehicle acceleration to 3 g. 6 da seconds prior to main engine cutoff (MECO), which occurred at T+8 daqiqa 30 seconds, the RS-25 engines were throttled down to 67%. The GPCs controlled ET separation, and dumped the remaining LOX and LH2 to prevent outgassing while in orbit. The ET continued on a ballistic trajectory and broke up during reentry, with some small pieces landing in the Indian or Pacific Ocean.[13]:III–9–10

Early missions used two firings of the OMS to achieve orbit; the first firing raised the apogee while the second circularized the orbit. Missions after STS-38 used the RS-25 engines to achieve the optimal apogee, and used the OMS engines to circularize the orbit. The orbital altitude and inclination were mission-dependent, and the Space Shuttle's orbits varied from 220 km (120 nmi) to 620 km (335 nmi).[13]:III–10

Orbitada

Space Shuttle Endeavour Xalqaro kosmik stantsiyani birlashtirdi
Harakat qiling docked at ISS during the STS-134 mission

The type of mission that the Space Shuttle was assigned to dictated the type of orbit that it entered. The initial design of the reusable Space Shuttle envisioned an increasingly cheap launch platform to deploy commercial and government satellites. Early missions routinely ferried satellites, which determined the type of orbit that the orbiter vehicle would enter. Keyingi CHellenjer disaster, many commercial payloads were moved to expendable commercial rockets, such as the Delta II.[13]:III–108, 123 While later missions still launched commercial payloads, Space Shuttle assignments were routinely directed towards scientific payloads, such as the Hubble kosmik teleskopi,[13]:III–148 Spacelab,[17]:434–435 va Galiley kosmik kemasi.[13]:III–140 Boshlash STS-74, the orbiter vehicle conducted dockings with the Mir kosmik stantsiyasi.[13]:III–224 In its final decade of operation, the Space Shuttle was used for the construction of the Xalqaro kosmik stantsiya.[13]:III–264 Most missions involved staying in orbit several days to two weeks, although longer missions were possible with the Extended Duration Orbiter pallet.[13]:III–86 The 17 day 15 hour STS-80 mission was the longest Space Shuttle mission duration.[13]:III–238

Re-entry and landing

STS-42-ga qayta kirish paytida qo'mondon va uchuvchining ko'rinishi
Flight deck view of Kashfiyot davomida STS-42 qayta kirish
Discovery qo'nishidan keyin o'zini sekinlatish uchun parashyutni tarqatdi
Kashfiyot deploying its brake parachute after landing on STS-124

Approximately four hours prior to deorbit, the crew began preparing the orbiter vehicle for reentry by closing the payload doors, radiating excess heat, and retracting the Ku band antenna. The orbiter vehicle maneuvered to an upside down, tail first orientation and began a 2-4 minute OMS burn approximately 20 minutes before it reentered the atmosphere. The orbiter vehicle reoriented itself to a nose-forward position with a 40° angle-of-attack, and the forward reaktsiyani boshqarish tizimi (RCS) jets were emptied of fuel and disabled prior to reentry. The orbiter vehicle's reentry was defined as starting at an altitude 120 km (400,000 ft), when it was traveling approximately Mach 25. The orbiter vehicle's reentry was controlled by the GPCs, which followed a preset angle-of-attack plan to prevent unsafe heating of the TPS. The GPCs also controlled the multiple aerobraking S-turns, using only the roll axis, to dissipate excess speed without changing the angle-of-attack.[13]:III–12The orbiter vehicle's aft RCS jets were disabled as it descended and its ailerons, elevators, and rudder became effective in the lower atmosphere. At an altitude of 46 km (150,000 ft), the orbiter vehicle opened its tez tormozlash on the vertical stabilizer. At 8 daqiqa 44 seconds prior to landing, the crew deployed the air data probes, and began lowering the angle-of-attack to 36°.[13]:III–12 Orbitaning maksimal darajasi sirpanish nisbati /tortish-tortish nisbati varied considerably with speed, ranging from 1.3 at gipertonik speeds to 4.9 at subsonic speeds.[13]:II–1 The orbiter vehicle flew to one of the two Heading Alignment Cones, located 48 km (30 mi) away from each end of the runway's centerline, where it made its final turns to dissipate excess energy prior to its approach and landing. Once the orbiter vehicle was traveling subsonically, the crew took over manual control of the flight.[13]:III–13

The approach and landing phase began when the orbiter vehicle was at an altitude of 3,000 m (10,000 ft) and traveling at 150 m/s (300 kn). The orbiter vehicle followed either a -20° or -18° glideslope and descended at approximately 51 m/s (167 ft/s). The speed brake was used to keep a continuous speed, and crew initiated a pre-flare maneuver to a -1.5° glideslope at an altitude of 610 m (2,000 ft). The landing gear was deployed 10 seconds prior to touchdown, when the orbiter was at an altitude of 91 m (300 ft) and traveling 150 m/s (288 kn). A final flare maneuver reduced the orbiter vehicle's descent rate to 0.9 m/s (3 ft/s), with touchdown occurring at 100–150 m/s (195–295 kn), depending on the weight of the orbiter vehicle. After the landing gear touched down, the crew deployed a drag chute out of the vertical stabilizer, and began wheel braking when the orbiter vehicle was traveling slower than 72 m/s (140 kn). After wheels stop, the crew deactivated the flight components and prepared to exit.[13]:III–13

Uchish joylari

Shuningdek qarang: Space Shuttle qo'nish joylari ro'yxati

The primary Space Shuttle landing site was the Shuttle qo'nish vositasi at KSC, where 78 of the 133 successful landings occurred. In the event of unfavorable landing conditions, the Shuttle could delay its landing or land at an alternate location. The primary alternate was Edwards AFB, which was used for 54 landings.[13]:III–18–20 STS-3 ga tushdi Oq qumli kosmik port yilda Nyu-Meksiko and required extensive post-processing after exposure to the gips -rich sand, some of which was found in Kolumbiya debris after STS-107.[13]:III–28 Landings at alternate airfields required the Shuttle Carrier Aircraft to transport the orbiter back to Kanaveral burni.[13]:III–13

In addition to the pre-planned landing airfields, there were 85 agreed-upon emergency landing sites to be used in different abort scenarios, with 58 located in other countries. The landing locations were chosen based upon political relationships, favorable weather, a runway at least 2,300 m (7,500 ft) long, and TACAN yoki DME uskunalar. Additionally, as the orbiter vehicle only had UHF radios, international sites with only VHF radios would have been unable to communicate directly with the crew. Facilities on the east coast of the US were planned for East Coast Abort Landings, while several sites in Europe and Africa were planned in the event of a Transoceanic Abort Landing. The facilities were prepared with equipment and personnel in the event of an emergency shuttle landing, but were never used.[13]:III–19

Post-landing processing

Asosiy maqola: Orbiterni qayta ishlash vositasi
Ekipajni orbitadan olib chiqish uchun er ekipajlari ishlayotgan paytda uchish-qo'nish yo'lagidagi
Kashfiyot being prepared after landing for crew disembarkment

After the landing, ground crews approached the orbiter to conduct safety checks. Teams wearing self-contained breathing gear tested for presence of vodorod, gidrazin, monomethylhydrazine, azot tetroksidi va ammiak to ensure the landing area was safe.[38] Air conditioning and Freon lines were connected to cool the crew and equipment and dissipate excess heat from reentry.[13]:III-13 A parvoz jarrohi boarded the orbiter and performed medical checks of the crew before they disembarked. Once the orbiter was secured, it was towed to the OPF to be inspected, repaired, and prepared for the next mission.[38]

Space Shuttle dasturi

Asosiy maqola: Space Shuttle dasturi

The Space Shuttle flew from April 12, 1981[13]:III–24 until July 21, 2011.[13]:III–398 Throughout the program, the Space Shuttle had 135 missions,[13]:III–398 of which 133 returned safely.[13]:III–80, 304 Throughout its lifetime, the Space Shuttle was used to conduct scientific research,[13]:III–188 deploy commercial,[13]:III–66 military,[13]:III–68 and scientific payloads,[13]:III–148 and was involved in the construction and operation of Mir[13]:III–216 va XKS.[13]:III–264 During its tenure, the Space Shuttle served as the only U.S. vehicle to launch astronauts, of which there was no replacement until the launch of Crew Dragon Demo-2 2020 yil 30 mayda.[39]

Byudjet

The overall NASA budget of the Space Shuttle program has been estimated to be $221 billion (in 2012 dollars).[13]:III−488 The developers of the Space Shuttle advocated for reusability as a cost-saving measure, which resulted in higher development costs for presumed lower costs-per-launch. During the design of the Space Shuttle, the Phase B proposals were not as cheap as the initial Phase A estimates indicated; Space Shuttle program manager Robert Thompson acknowledged that reducing cost-per-pound was not the primary objective of the further design phases, as other technical requirements could not be met with the reduced costs.[13]:III−489−490 Development estimates made in 1972 projected a per-pound cost of payload as low as $1,109 (in 2012) per pound, but the actual payload costs, not to include the costs for the research and development of the Space Shuttle, were $37,207 (in 2012) per pound.[13]:III−491 Per-launch costs varied throughout the program, and were dependent on the rate of flights as well as research, development, and investigation proceedings throughout the Space Shuttle program. In 1982, NASA published an estimate of $260 million (in 2012) per flight, which was based on the prediction of 24 flights per year for a decade. The per-launch cost from 1995–2002, when the orbiters and ISS were not being constructed and there was no recovery work following a loss of crew, was $806 million. NASA published a study in 1999 that concluded that costs were $576 million (in 2012) if there were seven launches per year. In 2009, NASA determined that the cost of adding a single launch per year was $252 million (in 2012), which indicated that much of the Space Shuttle program costs are for year-round personnel and operations that continued regardless of the launch rate. Accounting for the entire Space Shuttle program budget, the per-launch cost was $1.642 billion (in 2012).[13]:III−490

Tabiiy ofatlar

Asosiy maqolalar: Space Shuttle Challenger halokati va Kolumbiya kosmik kemasi halokati

On January 28, 1986, STS-51-L disintegrated 73 seconds after launch, due to the failure of the right SRB, killing all seven astronauts on board CHellenjer. The disaster was caused by low-temperature impairment of an O-ring, a mission-critical seal used between segments of the SRB casing. Failure of the O-ring allowed hot combustion gases to escape from between the booster sections and burn through the adjacent ET, leading to a sequence of events which caused the orbiter to disintegrate.[40]:71 Repeated warnings from design engineers voicing concerns about the lack of evidence of the O-rings' safety when the temperature was below 53 °F (12 °C) had been ignored by NASA managers.[40]:148

On February 1, 2003, Kolumbiya disintegrated during re-entry, killing all seven of the STS-107 crew, because of damage to the uglerod-uglerod leading edge of the wing caused during launch. Ground control engineers had made three separate requests for high-resolution images taken by the Department of Defense that would have provided an understanding of the extent of the damage, while NASA's chief TPS engineer requested that astronauts on board Kolumbiya be allowed to leave the vehicle to inspect the damage. NASA managers intervened to stop the Department of Defense's imaging of the orbiter and refused the request for the spacewalk,[13]:III–323[41] and thus the feasibility of scenarios for astronaut repair or rescue by Atlantis were not considered by NASA management at the time.[42]

Tanqid

Asosiy maqola: Space Shuttle dasturini tanqid qilish

The partial reusability of the Space Shuttle was one of the primary design requirements during its initial development.[6]:164 The technical decisions that dictated the orbiter's return and reuse reduced the per-launch payload capabilities with the intention of lowering the per-launch costs and resulting in a high-launch rate. The actual costs of a Space Shuttle launch were higher than initially predicted, and the Space Shuttle did not fly the intended 24 missions per year as initially predicted by NASA.[43][13]:III–489–490 The Space Shuttle was originally intended as a launch vehicle to deploy satellites, which it was primarily used for on the missions prior to the CHellenjer falokat. NASA's pricing, which was below cost, was lower than expendable launch vehicles; the intention was that the high volume of Space Shuttle missions would compensate for early financial losses. The improvement of expendable launch vehicles and the transition away from commercial payload on the Space Shuttle resulted in expendable launch vehicles becoming the primary deployment option for satellites.[13]:III–109–112

The fatal CHellenjer va Kolumbiya disasters demonstrated the safety risks of the Space Shuttle that could result in the loss of the crew. The spaceplane design of the orbiter limited the abort options, as the abort scenarios required the controlled flight of the orbiter to a runway or to allow the crew to egress individually, rather than the abort escape options on the Apollo and Soyuz kosmik kapsulalar.[44] Early safety analyses advertised by NASA engineers and management predicted the chance of a catastrophic failure resulting in the death of the crew as ranging from 1 in 100 launches to as rare as 1 in 100,000.[45][46] Following the loss of two Space Shuttle missions, the risks for the initial missions were reevaluated, and the chance of a catastrophic loss of the vehicle and crew was found to be as high as 1 in 9.[47] NASA management was criticized afterwards for accepting increased risk to the crew in exchange for higher mission rates. Ikkalasi ham CHellenjer va Kolumbiya reports explained that NASA culture had failed to keep the crew safe by not objectively evaluating the potential risks of the missions.[46][48]:195–203

Iste'fo

Asosiy maqola: Space Shuttle nafaqaga chiqishi
Atlantisni so'nggi qo'nishdan keyin olomon kutib olmoqda
Atlantis after its, and the program’s, final landing

The Space Shuttle retirement was announced in January 2004.[13]:III-347 Prezident Jorj V.Bush uning e'lon qildi Kosmik tadqiqotlar uchun qarash, which called for the retirement of the Space Shuttle once it completed construction of the ISS.[49][50] To ensure the ISS was properly assembled, the contributing partners determined the need for 16 remaining assembly missions in March 2006.[13]:III-349 One additional Hubble Space Telescope servicing mission was approved in October 2006.[13]:III-352 Dastlab, STS-134 was to be the final Space Shuttle mission. Biroq, Kolumbiya disaster resulted in additional orbiters being prepared for launch on need in the event of a rescue mission. Sifatida Atlantis was prepared for the final launch-on-need mission, the decision was made in September 2010 that it would fly as STS-135 with a four-person crew that could remain at the ISS in the event of an emergency.[13]:III-355 STS-135 launched on July 8, 2011, and landed at the KSC on July 21, 2011, at 5:57 ertalab EDT (09:57 UTC).[13]:III-398 From then until the launch of Crew Dragon Demo-2 on May 30, 2020, the US launched its astronauts aboard Russian Soyuz spacecraft.[51]

Following each orbiter's final flight, it was processed to make it safe for display. The OMS and RCS systems used presented the primary dangers due to their toxic hypergolic propellant, and most of their components were permanently removed to prevent any dangerous outgassing.[13]:III-443 Atlantis displeyida Kennedi kosmik markazining tashrif buyuruvchilar majmuasi,[13]:III-456 Kashfiyot da Udvar-Xazi markazi,[13]:III-451 Harakat qiling displeyida Kaliforniya ilmiy markazi,[13]:III-457 va Korxona da ko'rsatiladi Qo'rqmas dengiz-havo-kosmik muzeyi.[13]:III-464 Components from the orbiters were transferred to the US Air Force, ISS program, and Russian and Canadian governments. The engines were removed to be used on the Kosmik uchirish tizimi, and spare RS-25 nozzles were attached for display purposes.[13]:III-445

Ommaviy madaniyatda

The Space Shuttle, and fictitious variants, have been featured in numerous movies.

Shuningdek qarang

Izohlar

  1. ^ In this case, the number of successes is determined by the number of successful Space Shuttle missions.
  2. ^ STS-1 va STS-2 were the only Space Shuttle missions that used a white fire-retardant coating on the external tank. Subsequent missions did not use the latex coating to reduce the mass, and the external tank appeared orange.[8]:48

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