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  [Discuss] SLS core stage 'Green Run' tests

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Author Topic:   [Discuss] SLS core stage 'Green Run' tests
Robert Pearlman
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From: Houston, TX
Registered: Nov 1999

posted 01-31-2020 04:52 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
Please use this topic to discuss NASA's Space Launch System (SLS) Green Run test series, the top-to-bottom integrated testing of the core stage's systems prior to the SLS's maiden flight.

Robert Pearlman
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From: Houston, TX
Registered: Nov 1999

posted 01-31-2020 04:54 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
From NASA Administrator Jim Bridenstine, via Twitter:
The first test in the Green Run series of the Artemis I Space Launch System Core Stage COMPLETE at Stennis Space Center. Data from this modal testing will be used to verify critical flight control parameters and structural models.

oly
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posted 02-24-2020 06:26 PM     Click Here to See the Profile for oly   Click Here to Email oly     Edit/Delete Message   Reply w/Quote
Are there any image or data releases from the first green run test as of yet?

Robert Pearlman
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From: Houston, TX
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posted 02-24-2020 06:54 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
The "modal test" does not sound like it was very photogenic. As I understand it, it involved lifting the core stage with a crane so that it was isolated from the stand and then striking with a metal hammer-like device so that the sensors installed on the stage recorded the frequency generated.

If correct, this type of test and its data are generally not something meriting a public release.

oly
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From: Perth, Western Australia
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posted 02-25-2020 01:49 AM     Click Here to See the Profile for oly   Click Here to Email oly     Edit/Delete Message   Reply w/Quote
Thanks Robert, yes, the modal tests are where they ring the vehicle like a bell to determining the vehicles natural frequencies so that such data can be used in subsequent tests. I thought it would be interesting to observe such tests in progress.

Robert Pearlman
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From: Houston, TX
Registered: Nov 1999

posted 05-21-2020 08:05 AM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
NASA has released this photo from the first modal test:
Teams at NASA's Stennis Space Center near Bay St. Louis, Mississippi, completed the first test of the eight-part core stage Green Run test series for NASA's Space Launch System (SLS) rocket on Jan. 30, 2020.

Headshot
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posted 05-21-2020 10:24 AM     Click Here to See the Profile for Headshot   Click Here to Email Headshot     Edit/Delete Message   Reply w/Quote
Is there a schedule of the test cases with tentative dates for the seven remaining test cases?

I am wondering if there is any audio recording of the first test? My imagination tells me the core stage rang like a bell for all of Stennis to hear. I am certain that reality was probably far less dramatic.

Robert Pearlman
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From: Houston, TX
Registered: Nov 1999

posted 05-21-2020 10:56 AM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
I am not aware of a schedule. At a recent NASA Advisory Committee meeting, it was said the final test, the hot fire, will likely be in the Thanksgiving-ish timeframe this year.

Robert Pearlman
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From: Houston, TX
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posted 07-15-2020 11:50 AM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
Boeing's Space Launch System manager John Shannon said today (July 16) that a wet dress rehearsal is planned for September, followed by the full duration hot fire test in October.

Robert Pearlman
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From: Houston, TX
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posted 08-06-2020 11:30 AM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
From NASA Administrator Jim Bridenstine (via Twitter):
Progress! The fourth test of the Space Launch System core stage Green Run test series is complete. Teams finished testing the main propulsion system components within the core stage that connect to the rocket's four RS-25 engines on August 5.

Robert Pearlman
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From: Houston, TX
Registered: Nov 1999

posted 10-13-2020 09:20 AM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
Per John Shannon, Boeing's vice president and program manager for the Space Launch System, in a call with reporters today, the wet dress rehearsal (loading the core stage with propellants) is targeted for Oct. 30 and the hotfire is targeted for Nov. 14.

The core stage would then ship to the Kennedy Space Center to be prepared for the Artemis I mission on or before Jan. 14, 2021.

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