SLS - space launch system (3-я попытка)

[tnt22]

Уже неплохо...

 Stephen Clark @StephenClark1 1 ч. назад

Update from Stennis Space Center spokesperson after Hurricane Zeta: "We didn't sustain any damage to the test stand or (SLS) core stage. The center is back to normal operations."

[Чебурашка]

Prelim info notes the Artemis-1 Core Stage weathered Hurricane Zeta without damage. However, the SLS Green Run test schedule is under evaluation due to issues with a LH2 prevalve, and TVC performance during testing.

https://twitter.com/NASASpaceflight/status/1322347099988631552


Проблема в клапане на магистрали жидкого водорода и производительности системы управления вектором тяги.

Интересно, сколько прототипов старшипа успеет построить один фигляр, пока заслуженная фирма поменяет клапан?

[Crasher]

Интересно, сколько прототипов старшипа успеет построить один фигляр, пока заслуженная фирма поменяет клапан?

Пусть мои симпатии на стороне Маска, но.... у каждого из этих двух подходов есть свои плюсы и свои минусы. 
Вот например СЛС выйдет именно таким каким его задумывали, а Старшип ... походу дела будет ясно каким он выйдет.

[tnt22]

https://blogs.nasa.gov/artemis/2020/11/06/hurricane-zeta-impacts-sls-green-run-testing-status-update/

Hurricane Zeta Impacts, SLS Green Run Testing Status Update

Kathryn Hambleton
Posted Nov 6, 2020 at 5:42 pm

NASA has conducted an initial assessment of the impact from Hurricane Zeta at the agency's Stennis Space Center near Bay St. Louis, Mississippi and Michoud Assembly Facility in New Orleans. While storm appraisals are continuing, teams have determined that Stennis did sustain some damage on the center, but the B-2 test stand and the Space Launch System (SLS) rocket's core stage for Artemis I, currently in the stand, were not damaged. Michoud experienced damage to the outside and roof of buildings, but there is no damage to the SLS rocket or Orion spacecraft hardware being manufactured at the facility.

Widespread power outages in the area have made assessments difficult at both locations, and some buildings are still without power. While no personal injuries have been reported by NASA employees, many team members are also still without power, have experienced damage to personal property, and have not been able to return to work. Despite stopping work for the pandemic, as well as six Gulf Coast storms, and while working under pandemic-imposed restrictions, NASA and contractors Boeing and Aerojet Rocketdyne continue to make progress on Green Run testing of the SLS core stage at Stennis.

NASA has completed six of the eight core stage Green Run tests and is in the final stage of testing, which will operate the entire stage and its propulsion systems together for the first time. During the pause of on-site work due to the storm, engineers were able to take a closer look at data from recent testing. The team identified one of eight valves, which supply liquid hydrogen to the RS-25 engines, had inconsistent performance during recent tests. The valve is called a prevalve and is part of the core stage main propulsion system. NASA conducts ground testing on the core stage to demonstrate it is ready for flight, and the expert team of problem solvers is prepared to resolve any issues. Engineers have inspected the valve, understand the reason it is not working properly, and plan to repair the valve while the core stage remains in the B-2 test stand. Following a successful repair, the team plans to conduct the Green Run wet dress rehearsal and hot fire testing before the end of the year.

NASA is testing the new core stage on the ground to identify issues before flight, as the agency has done with every new rocket stage ever flown. The Green Run test series is a comprehensive test of the rocket's core stage before it launches Artemis missions to the Moon. Check back at this blog for an update on completion of the repair and an updated schedule for the final Green Run tests.

[triage]

https://www.appropriations.senate.gov/imo/media/doc/CJSRept.pdf

EXPLANATORY STATEMENT FOR THE DEPARTMENTS OF COMMERCE AND JUSTICE, SCIENCE, AND RELATED AGENCIES APPROPRIATIONS BILL, 2021

...
The Committee provides $2,585,900,000 for SLS; $1,406,700,000 for Orion; and $590,000,000 for Exploration Ground Systems. These funding levels reflect consistent programmatic funding to ensure the earliest possible crewed launch of SLS, as well as prepare for future science and crewed missions.
...
Block 1B Development.—The Committee is supportive of fully developing the capabilities of SLS, and directs NASA to continue the simultaneous development of activities as authorized under section 302(c)(1)(a) and (b) of Public Law 111–267. Enabling the evolution of SLS from the vehicle to be used in Artemis-1 to the block 1B variant and eventually the 130 metric ton variant requires the continued development of the interim block 1B variation of SLS, including the continued development of the Exploration Upper Stage [EUS]. It also requires modifications to SLS, the continued construction of a block 1B compatible mobile launch platform [MLP–2], and any additional processing and launch capabilities. To further enable NASA's goals for the Artemis program, the Committee provides no less than $300,000,000 for EUS engine development and associated stage adapter work from within the amounts provided for SLS, and no less than $74,000,000 for MLP–2 from within Exploration Ground Systems.

...

[Quetzalcoatl]

The Committee provides $2,585,900,000 for SLS; $1,406,700,000 for Orion; and $590,000,000 for Exploration Ground Systems. These funding levels reflect consistent programmatic funding to ensure the earliest possible crewed launch of SLS, as well as prepare for future science and crewed missions.

Ну, все. Теперь им не отвертеться. Придется в следующем году запускать Artemis 1. 

[tnt22]

https://blogs.nasa.gov/artemis/2020/11/18/engineers-move-forward-with-sls-green-run-testing-valve-repair-complete/

Engineers Move Forward with SLS Green Run Testing, Valve Repair Complete

Kathryn Hambleton
Posted Nov 18, 2020 at 1:06 pm

Over the weekend, engineers at NASA's Stennis Space Center near Bay St. Louis, Mississippi, successfully repaired a valve inside the core stage of the agency's Space Launch System (SLS) rocket. The team designed an innovative tool to remove and replace the valve's faulty clutch while the core stage remained in the B-2 test stand, and without removing the entire valve. Subsequent testing of the repaired valve confirmed that the system is operating as intended.

This week, the team is preparing for the seventh Green Run test, called the wet dress rehearsal, when the stage will be loaded with cryogenic, or super-cold, propellant for the first time. NASA is now targeting the week of Dec. 7 for the wet dress rehearsal and the week of Dec. 21 for the hot fire test. During the hot fire test, all four engines will fire to simulate the stage's operation during launch. The Green Run test series is a comprehensive test of the rocket's core stage before it launches Artemis missions to the Moon. NASA remains on track to launch Artemis I by November 2021.

[tnt22]

https://blogs.nasa.gov/artemis/2020/11/20/nasa-prepares-for-next-series-of-rs-25-engine-tests-for-sls-rocket/

NASA Prepares for Next Series of RS-25 Engine Tests for SLS Rocket

Kathryn Hambleton
Posted Nov 20, 2020 at 2:52 pm



NASA installed a developmental RS-25 engine into the test stand at Stennis Space Center near Bay St. Louis, Mississippi. This engine will be used in an upcoming test series to gather data and evaluate new components for development and production of new RS-25 engines for future Artemis missions. The new RS-25s will use advanced manufacturing methods and provide increased thrust levels, while also lowering manufacturing costs.

[tnt22]

http://www.boeing.com/features/2020/11/sls-green-run-test-team-perseveres-through-hurricanes-technical-challenges.page

SLS Green Run test team perseveres through hurricanes, technical challenges

After a valve repair, the Space Launch System core stage is moving forward to wet dress rehearsal and hot fire
November 24, 2020 in Space


Engineers and technicians have successfully repaired a faulty prevalve in the Space Launch System core stage propulsion system while the stage remained in the B-2 test stand at NASA's Stennis Space Center. The core stage is being tested on the ground to identify issues before flight.
NASA photo

Testing of the Boeing-built core stage for NASA's first Space Launch System rocket has been slowed by impacts from five hurricanes and a tropical storm during Gulf Coast storm season, and more recently by a problem with a prevalve on one of the stage's liquid hydrogen propellant feed lines.

But the test team at NASA's Stennis Space Center in Mississippi has persevered through all challenges as the core stage continues its Green Run test series, with just two major tests to go.

During a pause in on-site work for Hurricane Zeta earlier this month, engineers reviewed data from the core stage's first six tests. They focused on inconsistent performance from one of four prevalves that supply liquid hydrogen to the RS-25 engines. Boeing and the valve supplier designed an innovative tool to remove and replace the valve's faulty clutch while the core stage remained in the B-2 test stand, without removing the entire valve. Subsequent testing of the repaired valve confirmed that the system is operating as intended.

"We've got an innovative team, applying decades of knowledge and creative thinking to all problems, and coming up with options that can preserve our schedule," said Mark Nappi, Green Run test director for Boeing. "Hurricane season has consumed our margin, so we're focused on maintaining our schedule to ship to Kennedy Space Center in January, though the next two test dates have moved."

The next Green Run test, wet dress rehearsal, is targeted for the week of Dec. 7. The team will load, control and drain more than 700,000 gallons (roughly 2.6 million liters) of cryogenic propellants and simulate a countdown up to the moment of firing the engines. 

If all goes well with Test 7, the team will move on to Test 8, a full countdown and hot-fire for up to eight minutes. All four RS-25 engines will fire at a full, combined 1.6 million pounds (over 700,000 kilograms) of thrust, just as they will on the launch pad. Thrust increases as the rocket ascends and the atmosphere thins, ultimately reaching the "vacuum" level of more than 2 million pounds (roughly 900,000 kilograms) of thrust.

After that, Boeing engineers and technicians will refurbish the stage and prepare it to be delivered to Kennedy. There, it will be joined with waiting components — including the Orion human-rated spacecraft and the Boeing–United Launch Alliance Interim Cryogenic Upper Stage — ahead of launch on NASA's uncrewed Artemis I launch in late 2021.

[Чебурашка]

Красота! Но в центре чего-то не хватает 

[tnt22]

https://blogs.nasa.gov/artemis/2020/12/04/nasa-go-for-green-run-wet-dress-rehearsal/

NASA 'Go' for Green Run Wet Dress Rehearsal

Jennifer Harbaugh
Posted Dec 4, 2020 at 1:34 pm

In a test readiness review on Friday, Dec. 4, NASA gave the "go" to start the next Green Run test, wet dress rehearsal, for NASA's Artemis I Space Launch System (SLS) rocket core stage. The wet dress rehearsal is the first time the stage will be fully loaded with propellants and is planned to last approximately 48 hours. The test will begin on Saturday, Dec. 5 by powering up the core stage avionics, and engineers plan to load more than 700,000 gallons of cryogenic, or supercooled, propellant on Monday, Dec. 7.

This is the seventh of eight Green Run tests for the Artemis I core stage built by Boeing and the four RS-25 engines manufactured by Aerojet Rocketdyne. For this test, the team will focus on the core stage's first exposure to cryogenic propellants. Six barges filled with liquid hydrogen and oxygen are supplying the propellant to the B-2 test stand at NASA's Stennis Space Center near Bay St. Louis, Mississippi where the Green Run tests are taking place.

Engineers will monitor the core stage's giant propellant tanks and complex propulsion systems for potential leaks or other issues that stages have historically experienced the first time cryogenic propellants are loaded. To prepare for Artemis launches, engineers also will put the stage through scenarios it might experience on the pad before lift-off. They plan to conduct two different holds in the countdown timeline while the stage is in a launch-ready state. This provides an opportunity to observe how the stage would respond if the countdown was paused during the upcoming hot fire test or a future Artemis launch. At the end of the test, all the propellant will be drained following similar procedures that would be used during a launch scrub on the pad. After draining the tanks, the team will review the test data before proceeding with plans for the hot fire test.

[Чебурашка]

Ну чё, сегодня первая заправка SLS c имитацией предстартового отсчёта до точки Т-33 сек 
Заправку начнут вечерком по нашему времени, а закончить должны к часу ночи.

Кстати, SLS в отличии от шаттла не крепится болтами к пусковому столу, а сама стоит

[Чебурашка]

Заправляют https://twitter.com/NASA_SLS/status/1336020153096663040

Engineers are currently conducting the seventh test of the SLS core stage Green Run test series: the wet dress rehearsal. During this test, more than 700,000 gallons of cryogenic propellant are loaded and drained from the stage's tanks.

[tnt22]

К #2597:

https://blogs.nasa.gov/artemis/2020/12/07/green-run-wet-dress-rehearsal-update/

Green Run Wet Dress Rehearsal Update

Admin
Posted Dec 7, 2020 at 10:53 pm

NASA successfully powered up the core stage at the agency's Stennis Space Center near Bay St. Louis, Mississippi on Dec. 5 and started the process to load propellant for the first time into the Space Launch System (SLS) rocket core stage Dec. 7. To complete this wet dress rehearsal exercise, cryogenic propellants are transferred from facility barge systems to the core stage. To test propellant loading procedures, engineers successfully loaded a small amount of liquid hydrogen into the core stage without any issues. Then, they paused propellant loading to review data and adjust procedures before loading additional propellant.

Operations are continuing, and the team will refine the procedures and resume the wet dress rehearsal test in the coming days. The core stage performed well, and there are no issues with the stage, the B-2 test stand, or other facilities at Stennis.

The purpose of the test is to complete first-time operations using the new facilities and new rocket stage and adjust processes as necessary. The wet dress rehearsal is the seventh of eight Green Run tests being performed on the Artemis I core stage. Check back at this blog for more updates.

[Чебурашка]

https://www.reddit.com/r/SpaceLaunchSystem/comments/k8xnuz/david_willis_on_twitter/

Пишут, что залили жидкий водород, а при заправке кислородом. 

Apparently the H2 load went fine, but they scrubbed during the LOX load.

[Чебурашка]

Как я понял, у SLS самый большой в истории ракетостроения топливный бак..
Для жидкого водорода - 2000 м3.


У "Энергии" было - 1523 м3
У шаттла - 1497 м3

У первой ступени Сатурна-5 бак жидкого кислорода был - 1305 м3
А на второй ступени бак жидкого водорода - 980 м3

На первой ступени Н-1 какие объёмы баков? Что-то не могу нигде найти.

[Просто Василий]

А у кастрюли сколько будет?

[tnt22]

https://blogs.nasa.gov/artemis/2020/12/10/green-run-wet-dress-rehearsal-update-2/

Green Run Wet Dress Rehearsal Update

Admin
Posted Dec 10, 2020 at 11:40 am

NASA is proceeding with Green Run testing of the Artemis I core stage at the agency's Stennis Space Center near Bay St. Louis, Mississippi. After refining the procedures for test operations, NASA is planning to conduct a full wet dress rehearsal next week.

On Dec. 5, engineers powered up the stage to start wet dress rehearsal testing and successfully conducted an initial propellant loading on Dec. 7. This partial loading showed the stage performed well and has given the NASA and Boeing team a valuable opportunity to practice loading procedures and monitor the Artemis I core stage as it is exposed to cryogenic, or supercold, liquids for the first time. While performing operations to load liquid oxygen propellant earlier in the day, data showed the temperature of the propellant was warmer than planned, and the NASA and Boeing team paused the test to take a closer look at the data before committing to loading all 700,000 gallons of propellant. The team proceeded with loading a limited amount of liquid hydrogen, cooled to minus 423 degrees Fahrenheit, without any issues.

After an integrated assessment of the core stage and the facility, the team identified processes and equipment that could be modified to keep the liquid oxygen at the proper temperature during delivery to the stage. The team is now implementing these changes while Stennis personnel replenish propellants and other commodities needed to run the full wet dress rehearsal.

The wet dress rehearsal is the seventh of eight Green Run tests and the last before the hot fire test of the entire stage. The purpose of the wet dress rehearsal is to complete propellant loading operations and thoroughly check out the core stage's complex systems as they are exposed to cryogenic propellant for the first time. Following wet dress rehearsal, the team will analyze the data and set a date for the hot fire test

Tune in to nasa.gov/live at 12 p.m. EST Thursday, Dec. 10 to for more details on the upcoming test in the Green Run testing series for the Space Launch System (SLS) rocket's core stage that will fly on the agency's Artemis I mission.

[Rediska]

NASA's Artemis Program (@NASAArtemis) твитнул(а): We're beginning to stack the @NASA_SLS rocket for our first #Artemis mission inside the Vehicle Assembly Building—the same place we assembled the Saturn V rocket for the Apollo missions.

Follow @NASAKennedy to get updates on the journey to the launchpad. https://t.co/c8W7WG5tLG https://twitter.com/NASAArtemis/status/1338997269195010052?s=20

[Чебурашка]

Пока с Флакона топливо сливают, в SLS заливают.
Сегодня вторая попытка полностью заправить Core Stage