SLS - space launch system (3-я попытка)

[Старый]

Alex_II написал:
 

Старый написал:
Да ладно! Нелетание SLS  в течение года гораздо дешевле чем все полёты шаттла за год вместе взятые.  

Так НЕ летать вообще дешевле чем летать...

Дык! Я ж это и говорю.  

[Чебурашка]

--del--

[Not]

Rudel написал:
 

Alex_II написал:
Ну делали ракету не для полетов а для попила, что ж такого то?

Не для попила, а для  поддержания количества рабочих мест и уменьшения безработицы .
Я понимаю, вы мечтаете о эдаком диком рынке, где неэффективные предприятия банкротились бы и вылетали в трубу - на таком рынке безусловно победил бы Маск.
Вот только спустя некоторое время после этого США получили бы социальный взрыв - и он бы снёс бы и Маска, и все его эффективные предприятия.
Так что SLS тоже делает важное и нужное дело.

Социальный взрыв - это вряд ли, а вот без современных средств доставки США оказались бы очень быстро, поскольку НИРами Маск не занимается вообще, это дорогое и не нужное прямо сейчас а значит с его хатаскрайного насеста лишнее. Естественно, что в правительстве это прекрасно понимают и продолжают развитие значительно более дорогих но при этом и значительно более совершенных носителей. Ну и Маск тоже регулярно подкрепляет это понимание своими дырявыми пузырями из четырех слоев стали.

[Alex_II]

Not написал:
Естественно, что в правительстве это прекрасно понимают и продолжают развитие значительно более дорогих но при этом и значительно более совершенных носителей.

Это, млять, вот это одоробло из отходов производства шаттла - "совершенный носитель" что ли? Ну разве что в плане освоения средств - Маску точно столько денег не просрать. Он на такие суммы чего доброго Марс начнет осваивать для желающих свалить из карантина...

[Boris Mekler]

Воистину, возьми любой пост Not'а, измени наоборот и получишь правду. Not лает про "дырявые пузыри Маска"? GAO в апрельском отчёте выражает опасения что SLS Core Stage того, течёт-с...

[Not]

Филолух, а как тебе удается с разницей в одну минуту одну и ту же хрень написать? И самое главное, зачем? Самомнение вдвое вырастает, или две копеечки за раз?

[Not]

Сомнения выражают не в том, что течет, а что теоретически может потечь. И? Чего возбудился то? Все пузыри Маска в Бока Чике пока не теоретически лопнули, а вполне себе натурально

[Not]

Program officials indicated that one of the top remaining technical risks to the green run test is that the core stage may develop leaks when it is filled with fuel. According to these officials, they have conducted extensive scaled testing of the gaskets and seals used in the core stage; however, it is difficult to precisely predict how this large volume of liquid hydrogen will affect the stage. Should leaks or other issues be discovered, the program will need time to assess and mitigate difficulties or glitches, which could delay shipping the core stage to Kennedy Space Center and the enterprise integration and test schedule.

А теперь, филолух, соберись с мыслями и сформулируй, что тебя возбудило в вышепроцитированном тексте? То, что его Бергер вытащил на своем сайте? Так он ангажированный, имеет цель

[Boris Mekler]

То что опасения о протечках в этой бочке прошли весь олимпиард уровней менеджмента в Боинге и НАСА, и выплеснулись аж в GAO означает что это ж-ж-ж - неспроста.

[Alex_II]

Boris Mekler написал:
То что опасения о протечках в этой бочке прошли весь олимпиард уровней менеджмента в Боинге и НАСА, и выплеснулись аж в GAO означает что это ж-ж-ж - неспроста.

Просто никто кроме Not-a не хочет чтоб СЛС повторил судьбу Челленджера... Not-a это видимо вполне устраивает...

[Старый]

Alex_II написал:
 Просто никто кроме Not-a не хочет чтоб СЛС повторил судьбу Челленджера... 

Так у того же вроде ускоритель прогорел...  :oops: 

[Alex_II]

Старый написал:
Так у того же вроде ускоритель прогорел...

Я о том, что про эти дефекты ускорителей знали. И теребили начальство уже за некоторое время до аварии. Однако начальство то ли не вняло, то ли просто пропустило мимо ушей...

[Not]

Alex_II написал:
 

Boris Mekler написал:
То что опасения о протечках в этой бочке прошли весь олимпиард уровней менеджмента в Боинге и НАСА, и выплеснулись аж в GAO означает что это ж-ж-ж - неспроста.

Просто никто кроме Not-a не хочет чтоб СЛС повторил судьбу Челленджера... Not-a это видимо вполне устраивает...

Филолух, ты просто подумай, что бы в этом случае сделал Маск? А? Ну? И вы бы все тут орали, какой он молодец, что не боится испытывать

[tnt22]

Boeing Space ✔@BoeingSpace 5:47 PM - Apr 30, 2020

The #Artemis I core stage's command-and-control system is ready for the next Green Run tests because we worked with @NASA to complete a realistic @NASA_SLS Stage Controller review. See how this brings the team in tune for the avionics power-on.

More: http://www.boeing.com/features/2020/04/tuning-up-for-green-run-04-28-2020.page ...

http://www.boeing.com/features/2020/04/tuning-up-for-green-run-04-28-2020.page

Tuning up for Green Run

Space Launch System stage controller and avionics ready to perform next test phase
April 28, 2020 in Space

Boeing and NASA Space Launch System (SLS) teams recently completed a rigorous avionics review, ensuring that the program will be prepared to resume testing of the first SLS core stage when NASA reopens Stennis Space Center, where the core stage waits in its B2 test stand. The review validated that the avionics are ready to play their part in the ultimate Green Run test, which one SLS leader compares to a symphony performance.

"The propulsion systems make up the orchestra, while avionics is the conductor, the stage controller command-and-control system is the conductor's baton, and the music is the roaring engines of a perfect hot-fire test," explained Boeing SLS Avionics Director Kevin Fogarty, when asked to provide an analogy for the complicated systems at work.

Fogarty's team successfully completed the final Stage Controller Readiness Review with NASA, confirming that the stage controller will be ready to work when all the SLS avionics hardware and software are ready to orchestrate the first phase of Green Run testing.

Phase 1 will fully exercise the Avionics Power On sequence and confirm proper thrust vector control, main propulsion system operation, and safing checks. Next, the program will transition to the Phase 2 test period, which uses actual propellants for tests including a Wet Dress Rehearsal and the eight-minute firing of the stage's four RS-25 engines.

Leading up to the milestone was a robust test campaign in the NASA Marshall Space Flight Center labs, during which the Boeing and NASA teams used a flight-like representation of the avionics suite and stage controller, including 15 simulated test operator console stations, and representations of the B2 test stand and the Artemis I core stage. Stage controller software development is based in Titusville, Florida, headquarters for Boeing's Space and Launch division.

"We needed to ensure that the avionics validation test phase exercised the systems with the most comprehensive and realistic representation of the Green Run hot-fire, both nominal [ideal situation] and off-nominal [not routine] scenarios," Fogarty said. "We want to be ready for all potential scenarios during the test."

The Green Run hot-fire test requires a highly automated software sequence known as the Terminal Countdown Sequence (TCS), which transitions control of the test execution fr om the human operators to both ground and flight computers.

For the big day, Green Run Application Software – a variant of the NASA-produced flight software that will fly the SLS rocket – will be loaded onto the core stage computers, wh ere it is integrated with the flight avionics and stage controller systems.   Each of the flight computers shares data from subsystems and sensors, and "votes" on its validity, before executing commands to control the rocket.

"It's like building a giant remote control for launch," explained Boeing engineer Kim Bryner, who manages stage controller development from Florida.

Avionics teams in Florida and Alabama are now completing final software development and test work on Phase 2 TCS functionality to support the Wet Dress Rehearsal and hot-fire test.

[Чебурашка]

ЫЫЫЫ...  https://www.nasa.gov/press-release/nasa-commits-to-future-artemis-missions-with-more-sls-rocket-engines

18 новых двигателей RS-25 стоят  1'790 млн. $

Почти СТО МИЛЛИОНОВ за штуку...      

[Boris Mekler]

Чебурашка написал:

Почти СТО МИЛЛИОНОВ за штуку...      

Там веселее... миллиард за восстановление производства уже уплачен, плюс был контракт на первые шесть штук. На круг выходит 3.5 миллиарда за 24 штуки, или 146 миллионов за каждый.

[Старый]

Not написал:
Филолух, ты просто подумай, что бы в этом случае сделал Маск? А? Ну? И вы бы все тут орали, какой он молодец, что не боится испытывать

Маск бы не применил водород. А что?  :oops: 

[Старый]

Rudel написал:
 

Alex_II написал:
Ну делали ракету не для полетов а для попила, что ж такого то?

Не для попила, а для  поддержания количества рабочих мест и уменьшения безработицы .
Я понимаю, вы мечтаете о эдаком диком рынке, где неэффективные предприятия банкротились бы и вылетали в трубу - на таком рынке безусловно победил бы Маск.
Вот только спустя некоторое время после этого США получили бы социальный взрыв - и он бы снёс бы и Маска, и все его эффективные предприятия.
Так что SLS тоже делает важное и нужное дело.

Ничего подобного. В этом случае работники с обанкротившегося неэффективного предприятия переходили бы на новое эффективное (часто с переездом в другой город) и получали бы бОльшую зарплату. Так и происходит. Именно поэтому США в космосе а мы - в жопе. 

[tnt22]

https://spaceflightnow.com/2020/05/01/hopeful-for-launch-next-year-nasa-aims-to-resume-sls-operations-within-weeks/

Hopeful for launch next year, NASA aims to resume SLS operations within weeks
May 1, 2020 | Stephen Clark


A crane hoisted the Space Launch System core stage into the B-2 test stand at NASA's Stennis Space Center in January. Credit: NASA/SSC

With the Space Launch System's inaugural test flight now officially delayed to November 2021, NASA says work halted by the coronavirus pandemic will resume within weeks to prepare for the first test-firing of the SLS core stage at the Stennis Space Center in Mississippi.

The last official schedule fr om NASA had the first SLS test launch in March 2021, but managers have said for months that schedule was no longer achievable. After a thorough review, NASA says the first SLS launch — named Artemis 1 — is now planned in November of next year.

The most powerful launch vehicle since the Apollo-era Saturn 5 moon rocket, the Space Launch System will carry an unpiloted Orion crew capsule into space. The Orion spaceship will orbit the moon to demonstrate the capsule's capabilities and performance before NASA commits to flying astronauts around the moon on the second SLS/Orion flight in late 2022 or early 2023.

According to NASA's current plans, the Artemis 3 mission — scheduled as soon as 2024 — will send astronauts back to the moon on the third SLS/Orion flight. Once in lunar orbit, crew members will dock with a lunar lander and attempt a landing near the moon's south pole.

But the development of the Space Launch System, which kicked off in 2011, has faced ballooning costs, delays and a change in strategy ordered after the Trump administration took office in 2017. Since then, the White House has directed NASA to accelerate the return of U.S. astronauts to the lunar surface to 2024.

Years behind schedule, the march toward the first SLS test launch hit another hurdle in March when NASA ordered teams at the Stennis Space Center to pause operations on the B-2 test stand, wh ere the heavy-lift rocket's core stage arrived in January from its factory in New Orleans.

"We basically shut down operations there March 17," said Doug Loverro, associate administrator for NASA's human exploration and operations mission directorate.

Originally scheduled for a debut test launch in 2017, the Space Launch System has faced repeated delays, primarily due to difficulties in building the rocket's first flight-ready main stage, a large structure with cryogenic liquid hydrogen and liquid oxygen propellant tanks measuring 212 feet (64.6 meters) long.


The SLS core stage for the Artemis 1 mission was rotated vertical in January for installation into the B-2 test stand at NASA's Stennis Space Center in southern Mississippi. Credit: NASA/SSC

The core stage — built by Boeing — finally left its factory at NASA's Michoud Assembly Facility in New Orleans earlier this year. In January, the stage arrived at the B-2 test stand at Stennis, the same facility once used for test-firings of the main stage of NASA's Apollo-era Saturn 5 moon rocket.

Before the pandemic hit, NASA and contractor teams were readying for a test-firing of the SLS core stage's four hydrogen-fueled RS-25 main engines as soon as early August. Known as the green run, the test is the culmination of the core stage's construction and test campaign before delivery of the rocket to the Kennedy Space Center in Florida to final launch preparations.

In mid-March, rising numbers cases of the COVID-19 viral disease in the area around the Stennis Space Center — including the first confirmed positive case among the Stennis workforce — prompted NASA to stop work on the test stand. NASA also paused production of hardware for subsequent SLS launches at Michoud.

"There's no question we're going to lose some time to (the coronavirus pandemic), but we've tried to go ahead and maximize what we've got done," Loverro said in an interview Wednesday. "And we're right now working the reopening plans ... For each activity that we're doing, we are putting together a specific plan."

In a sign that operations at Stennis are beginning to resume, Loverro said NASA has approved the painting of a different test stand used to to test-fire individual RS-25 engines that are used on the SLS core stage.

"We have three other plans in work right now that will be submitted later this week to restart work at MAF (the Michoud Assembly Facility), and restart work at Stennis in different areas," Loverro said.

"We are going to be resuming work on the B-2 test stand in support of green run within the next couple of weeks," Loverro said. "It won't be at full speed, but it will be done in a safe manner so we can protect our Boeing and NASA workers down there. And we will work on the engine section, we'll work on the thermal protection system. Each element will be started when we have the plans and the gear ready to protect those workers."

Loverro said NASA and contractor teams continued with virtual training sessions and reviewed paperwork.

"It's often the case in these developments that the last thing that gets done is the paperwork, so we decided that we'd get ahead on the paperwork and get a lot of it signed off. And the software development has still continued as well," he said.

Loverro, a veteran manager in U.S. military space programs, led a comprehensive review of the SLS and Orion schedules since arriving at NASA late last year.

"We went through an entire re-baseline of the program," he said. "We looked at every schedule, and we came to the conclusion that we had a very high confidence date of November 2021.


Artist's concept of the Space Launch System Block 1 variant. Credit: NASA

"There's no question the COVID shutdown puts pressure on that date that we had not anticipated," Loverro said. "I would say the work and the experience that Boeing has done so far in green run gives me great hope and confidence that they are going to get back into this and get us very near to the original schedule on this."

He said NASA and Boeing teams at Stennis were working 10 days ahead of schedule during the green run test campaign before the shutdown in March.

"So performance was excellent," Loverro said. "Assuming we can get back to work in the next several weeks, I think that November 2021 date is still going to hold."

Development of the Orion spacecraft, led by Lockheed Martin and Airbus Defense and Space, has encountered its own delays. But the spaceship is on track to be ready to begin Artemis 1 launch preparations within the next few months, well ahead of the SLS timeline.

The Orion spacecraft for Artemis 1 arrived back at the Kennedy Space Center in March after thermal vacuum and electromagnetic testing at NASA's Plum Brook Station in Ohio.

"We were able to continue with Orion using the right protective gear to make sure we took care of our people and the Lockheed people," Loverro said. "We were able to continue with that, not as we would normally do it. But under very safe conditions, we were able to continue work there, and in fact have progressed."

A Government Accountability Office report released this week said one of the top remaining technical risks with the Space Launch System's core stage is that the rocket may develop leaks when filled with cryogenic liquid hydrogen and liquid oxygen for the first time.

NASA plans to load 730,000 gallons super-cold propellants into the rocket during a rehearsal for the green run test-firing. If all goes according to plan, engineers would follow the fueling test — called a wet dress rehearsal — with another propellant load culminating in a burn of all four RS-25 main engines lasting more than eight minutes.

"The next big unknown as a program is when we put the cryogenic liquids in the oxygen tank and the hydrogen tank, and we look at the plumbing and all the systems and make sure that they remain tight, and that they perform as expected through our qualification test," said John Shannon, Boeing's SLS program manager, in January. "We have high confidence that they will, but until you see it in an integrated fashion, you don't really know."

NASA has spent more than $15 billion on developing the Space Launch System since 2011.

"The program reported further development cost growth of $700 million since 2019, for a total increase of approximately $1.7 billion — or 24.6 percent — above the program's development baseline," the GAO reported of the SLS program this week.

Those figures assumed the SLS could lift for the first time in March 2021, a schedule that is no longer achievable.

[tnt22]

https://www.nasa.gov/press-release/nasa-commits-to-future-artemis-missions-with-more-sls-rocket-engines

May 1, 2020
RELEASE 20-050

NASA Commits to Future Artemis Missions with More SLS Rocket Engines


NASA has awarded a contract to Aerojet Rocketdyne of Sacramento, California, to manufacture 18 additional Space Launch System (SLS) RS-25 rocket engines to support Artemis missions to the Moon. The four RS-25 engines, shown here, are attached to the SLS core stage that will send the Artemis I mission to the Moon. Currently, the stage is undergoing a series of Green Run tests in a test stand at Stennis Space Center near Bay St. Louis, Mississippi. The additional engines will support future SLS flights to deep space.
Credits: NASA/Jude Guidry

NASA has awarded a contract to Aerojet Rocketdyne of Sacramento, California, to manufacture 18 additional Space Launch System (SLS) RS-25 rocket engines to support Artemis missions to the Moon.

The follow-on contract to produce 18 engines is valued at $1.79 billion. This includes labor to build and test the engines, produce tooling and support SLS flights powered by the engines. This modifies the initial contract awarded in November 2015 to recertify and produce six new RS-25 engines and brings the total contract value to almost $3.5 billion with a period of performance through Sept. 30, 2029, and a total of 24 engines to support as many as six additional SLS flights.

"This contract allows NASA to work with Aerojet Rocketdyne to build the rocket engines needed for future missions," said John Honeycutt, the SLS program manager at NASA's Marshall Space Flight Center in Huntsville, Alabama. "The same reliable engines that launched more than 100 space shuttle missions have been modified to be even more powerful to launch the next astronauts who will set foot on the lunar surface during the Artemis missions."

Each SLS rocket uses four RS-25 engines, providing a total of 2 million pounds of thrust to send SLS to space. The SLS rocket leverages the assets, capabilities, and experience of NASA's Space Shuttle Program, using 16 existing RS-25 shuttle engines for the first four SLS missions. These engines were updated with new controllers – the brains that control the engine – and upgraded and tested to fly at the higher performance level necessary to launch the SLS, which is much larger and more powerful than the shuttle.

The rocket engines are mounted at the base of the 212-foot-tall core stage, which holds more than 700,000 gallons of propellant and provides the flight computers that control the rocket's flight. The engines for the Artemis I mission to the Moon have already been assembled as part of the core stage, which is undergoing Green Run testing.

"We've already begun production on the first six new RS-25 engines," said Johnny Heflin, the SLS engines manager. "Aerojet Rocketdyne has restarted the production lines, established a supplier base and is building engines using advanced techniques that reduce both the cost and time for manufacturing each engine."

The engines are built at Aerojet Rocketdyne's factory in Canoga Park, California. Working with NASA, Aerojet has implemented a plan to reduce the cost of the engines by as much as 30% by using more advanced manufacturing techniques to modify some of the rocket components. Some of these modified components have already been tested during engine tests that replicate the conditions of flight.The new digital controllers are built by Honeywell Aerospace in Clearwater, Florida,  a major subcontractor to Aerojet Rocketdyne.

The SLS rocket, Orion spacecraft, Gateway and Human Landing System are part of NASA's backbone for deep space exploration. Work is well underway on both the Artemis I and II rockets. The Artemis I core stage and its RS-25 engines are in the B-2 test stand at NASA's Stennis Space Center near Bay St. Louis, Mississippi. Here, the stage is undergoing Green Run testing, an integrated test of the entire new stage that culminates with the firing of all four RS-25 engines. Upon completion of the test, NASA's Pegasus barge will take the core stage to NASA's Kennedy Space Center in Florida where it will be integrated with other parts of the rocket and Orion for Artemis I.

The Artemis program is the next step in human space exploration. It's part of America's broader Moon to Mars exploration approach, in which astronauts will explore the Moon and experience gained there to enable humanity's next giant leap, sending humans to Mars.

-end-

Last Updated: May 1, 2020
Editor: Sean Potter