Автор Salo, 16.02.2012 10:25:55
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Цитата: undefinedI'm hearing that it is more likely than not that NASA will perform a second hot-fire test of its SLS rocket core stage, and that this test can occur within three to four weeks, or likely some time in mid-February.
Цитата: undefinedNASA had 23 test objectives for this hot fire test, and completed 15 of them successfully with all of the data needed. The next step is to perform a risk assessment about sending the stage to Kennedy Space Center without another test
Цитата: Чебурашка от 19.01.2021 20:45:35Эрик Бергер делится очередным инсайдом.Повторный тест - в середине февраля.Цитата: undefinedI'm hearing that it is more likely than not that NASA will perform a second hot-fire test of its SLS rocket core stage, and that this test can occur within three to four weeks, or likely some time in mid-February.Цитата: undefinedNASA had 23 test objectives for this hot fire test, and completed 15 of them successfully with all of the data needed. The next step is to perform a risk assessment about sending the stage to Kennedy Space Center without another test
Цитата: Чебурашка от 19.01.2021 20:45:35NASA had 23 test objectives for this hot fire test, and completed 15 of them successfully with all of the data needed. The next step is to perform a risk assessment about sending the stage to Kennedy Space Center without another test
Цитата: opinion от 20.01.2021 00:29:07По-моему, повторять необязательно. Всего два независимых отказа в двух разных двигателях за минуту работы. Вполне можно лететь на Луну.
ЦитатаСразу на Луну, АВД на сладкой схеме, без сжигания всей матчасти, это великое достижение!
Цитата: nonconvex от 20.01.2021 06:29:31Проблемы огневых испытаний были в уставках контроллеров. Повторное испытание через три-четыре недели.
Цитата: Alex_II от 20.01.2021 07:16:01Цитата: nonconvex от 20.01.2021 06:29:31Проблемы огневых испытаний были в уставках контроллеров. Повторное испытание через три-четыре недели.Как однако ж долго меняются "уставки контроллеров"...
Цитата: Чебурашка от 20.01.2021 14:32:53Так вот, в программе SLS, одна единственная Core Stage по своему назначению заменяет сразу и 4М и 5С и 6СЛ. Вот поэтому и так медленно двигаются вперёд. Приходится всё выполнять последовательно, нельзя распараллелить работы. И трястись над ступенью. Если единственную Core Stage повредят, вся программа целиком сразу накроется медным тазом.
Цитата: Ber от 20.01.2021 18:38:53Я так понял, что если сейчас пойти и просверлить в баке дырку скажем полметра диаметром, то программа Артемида закроется?
Цитата: Чебурашка от 20.01.2021 14:23:32Оказывается, Core Stage можно заправлять только 9 раз.У бака шаттла можно было целых 13(!) раз.3 заправки уже использованы. Для повторного Green Run требуется ещё одна заправка. И на стартовом комплексе для тестов потребуется ещё одна тестовая заправка. На запуск остаётся всего лишь 4 попытки
ЦитатаNASA_SLS @NASA_SLSNASA keeps a history of which engines are used for each mission. The four RS-25 engines on the #Artemis I core stage that fired up on Jan. 16 are each unique and have collectively contributed to 21 different shuttle flights. Вам недоступны вложения в этом разделе.
Цитатаhttps://www.nasa.gov/centers/stennis/news/releases/2021/NASA-to-Begin-New-RS-25-Engine-Test-Series-for-Future-Artemis-Missions/NASA is set to begin a new round of tests for development of RS-25 engines that will help power the agency's Space Launch System (SLS) rocket on future missions to the Moon and, eventually, Mars. The first test of the new series is set for Jan. 28 on the A-1 Test Stand at Stennis Space Center near Bay St. Louis, Mississippi.The test will be streamed live on NASA TV.The seven-test series will use RS-25 developmental engine No. 0528 and will provide valuable data for Aerojet Rocketdyne, prime contractor for the SLS engines, as it begins production of new RS-25 engines for use after the first four SLS flights. Operators will focus on evaluating new engine components and reducing risk in engine operation. They also will fire the engine through a range of operating conditions to demonstrate and verify its capabilities.The upcoming test series will provide data to enhance production of new RS-25 engines and several engine components that are being manufactured with cutting-edge and cost-saving technologies. Operators also will demonstrate engine gimbaling capabilities, using a newly installed A-1 Test Stand thrust vector control system. "Gimbaling" refers to how the engine must move on a tight circular axis in order to ensure proper flight trajectory."We're going to evaluate these newly designed parts that were made using advanced manufacturing techniques," said Johnny Heflin, SLS liquid engines manager at Marshall Space Flight Center in Huntsville, where the SLS Program is based. "This test series will prove that the RS-25 production restart engines can be built with the same high performance but with more affordability. This is a big milestone that will greatly contribute to the future sustainability of SLS." Resumption of RS-25 single-engine testing on the A-1 Test Stand follows completion of major maintenance work on the facility originally built for Apollo Program testing more than 50 years ago. Projects designed to ensure the facility continues functioning at a high level included upgrading piping and the test stand flame deflector, painting the 40,000-gallon liquid oxygen 100,000-gallon liquid hydrogen tanks, remodeling the Test Control Center, and upgrading the data acquisition system, facility cameras, and facility control systems. The new NASA-designed-and-manufactured thrust vector control system also was finalized and installed during this time."It is exciting to return to hot fire testing at the A-1 Test Stand," Stennis RS-25 Project Manager Chip Ellis said. "We have worked hard the last 20 or so months to complete needed test stand maintenance projects. Now, the team is ready to get back to the business of testing for future deep space missions."The engine will be fired seven times for a total of 3,650 seconds during the first half of 2021. The schedule calls for six full-duration tests of about eight and a half minutes (500 seconds) and one hot fire of just under 11 minutes (650 seconds). A full duration test refers to the time the engine must fire during an actual launch in order to power SLS towards orbit. Longer duration hot fires are conducted to test the limits of engine performance.For about half of the firing time, the engines will operate at 111 of the power level at which the original space shuttle main engines were designed to perform. Operators will also demonstrate operation at the 113 percent power level for an extended period, as was initially demonstrated in a Feb. 2018 hot fire.The previous round of RS-25 testing concluded April 4, 2019 and focused primarily on validating new operating parameters for the initial RS-25 engines, which are modified heritage space shuttle main engines, and included acceptance testing of 16 former space shuttle main engines that will help launch the first four SLS missions. This new RS-25 test series begins as a separate test series, called Green Run, is in its final phase. The Green Run is a comprehensive series of tests of the core stage of the SLS rocket, which includes four RS-25 engines, and culminates with a final test to fire all four together for about eight minutes. The Green Run team recently fired all four RS-25 engines together for the first time and is currently evaluating if a second hot fire test is required.
Цитатаhttps://www.youtube.com/watch?v=XSPuLa5oWoM 9:37SLS RS-25 Engine Test, 28 January 2021 SciNewsAn Aerojet Rocketdyne RS-25 rocket engine was tested on the A-1 Test Stand at the John C. Stennis Space Center in Mississippi, on 28 January 2021, at 22:53 UTC (16:53 CDT, 17:53 EDT). The test was conducted using the RS-25 developmental engine No. 0528 and had a duration of 500 seconds (full-duration test). This RS-25 hot-fire test is part of the Retrofit-2 test series, aiming to evaluate new engine components and reduce risk in engine operation. NASA's Space Launch System (SLS) will be powered by four RS-25 engines firing simultaneously. Credit: NASA/Aerojet Rocketdyne