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Chris Bergin
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« on: 08/18/2008 03:44 PM » |
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Worth a thread on its own as we'll be aiming to transcribe this event.
NASA to Brief Media About Ares I Thrust Oscillation Plans
NASA will host a media teleconference on Tuesday, Aug. 19, at 11:30 a.m. EDT, to discuss results and recommendations from the Ares I thrust oscillation focus team. The team has been studying possible solutions to concerns raised about the early designs of the new crew launch vehicle that NASA's Constellation Program is building to return humans to the moon by 2020.
The briefing participants are:
-- Jeff Hanley, manager, Constellation Program, NASA's Johnson Space Center, Houston
-- Steve Cook, manager, Ares Projects, NASA's Marshall Space Flight Center, Huntsville, Ala.
-- Garry Lyles, associate director for technical management, NASA's Marshall Space Flight Center
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« on: 08/18/2008 03:44 PM » |
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EE Scott
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« Reply #1 on: 08/18/2008 05:32 PM » |
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I can see it now: 1) here were the options being considered, 2) our great engineers have chosen the following solution(s), 3) no more need to worry, go about your business, nothing to see here....
OK, I am probably being too cynical.
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bobthemonkey
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« Reply #2 on: 08/18/2008 05:33 PM » |
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So 4.30pm BST, Chris?
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Chris Bergin
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« Reply #3 on: 08/18/2008 05:49 PM » |
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So 4.30pm BST, Chris?
Yep indeedy. Depending on permissions/L2, I *may* have an article on site surrounding this teleconference 
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bobthemonkey
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« Reply #4 on: 08/18/2008 06:25 PM » |
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Lovely. Won't be able to listen in live on this one, so thanks in advance to the transcribing hamsters.
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JRThro
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« Reply #5 on: 08/18/2008 08:27 PM » |
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I can see it now: 1) here were the options being considered, 2) our great engineers have chosen the following solution(s), 3) no more need to worry, go about your business, nothing to see here....
OK, I am probably being too cynical.
That's pretty much what I'm expecting, so if you're being too cynical, you're not the only one.
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Chris Bergin
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« Reply #6 on: 08/19/2008 03:05 PM » |
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Starts in 30 minutes.
We'll run our article later on today (would be arrogant to run it before they've had their say on the teleconference). Plus we'll have images of the three migitation options to be used together (Aft skirt, interstage and Orion) for our article - as per Plan A - which is going through to further maturity at the end of the year. They also have three Plan incorrect.
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Chris Bergin
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« Reply #7 on: 08/19/2008 03:32 PM » |
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Starting....
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Syntax
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« Reply #8 on: 08/19/2008 03:35 PM » |
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Is it not show on NASA TV?
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Chris Bergin
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« Reply #9 on: 08/19/2008 03:36 PM » |
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Hanley:
TO is the key technical issue over the last year with Ares I. Expresses his appreciation to the team on working the issue.
Cook: We have a created set of options. The good news here is we have a solution here to solve TO. Minimum impact to Orion. Allows us to dial up on unknowns. We have some upcoming tests to understand the human performance and STS DTOs.
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Chris Bergin
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« Reply #10 on: 08/19/2008 03:41 PM » |
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They are talking like they have TO solved!
TO happens at 115 seconds for a very few seconds. Dealing with crew performance during that time, to read console displays and respond to what they see.
The crew health issue is easy to mitigate. 1/4 G is the aim to reduce the TO.
Narrowband frequency - which means it is easily mitigated, and gave us a lot of options.
Made primary reccomendations. Can we go to the source, and make some changes (internal SRB). Can we move the acoustic modes? And we looked at cancelling the modes.
TMA - Parasorber option...but we decided to go with this at the aft skirt (TMA).
We found that there may be modifications to the inert systems, not the prop systems. We need to do cold flow tests for that.
So the mitigation options are separate from the mods to the motor.
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Chris Bergin
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« Reply #11 on: 08/19/2008 03:47 PM » |
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Passive systems work to mitigate the health limit to the crew.
Active systems - like active TMA are very effective with dealing with the frequency ranges to below 1/4 G.
Brought in additional people, such as KSC, to make sure there's no hazards, and relibility. We think we can make a sound reccomendation to the program.
Design changes to Ares only. Active systems allow us to make changes with uncertainty. There's a lot of immaturity with the vehicle, but the options are robust, flexible and tunable.
We can remove some of this options as we go and tune them as we move forward.
Two options combine. Detune damper in interstage. Active TMA in the aft skirt. (Not mentioning crew seats!!)
We believe this system will be reliable. Sixteen actuators in the aft skiry with batteries. But we can lose multiple actuators and still deal with TO.
We can design this system that if we lose the whole system. As a passive TMA, it will still be well under the health limits of the crew.
Loss mass on the concepts. Mass impact is 1,200 to 1,400lbs - which is within the mass margins for Ares I. We think we can go forward with this for the PDR.
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Chris Bergin
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« Reply #12 on: 08/19/2008 03:50 PM » |
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Keith Cowing gets the first question  Asks about alternative launch studies. Are you not looking at alternative studies... Cook: No, we are completely commited to Ares I. Options we have looked at are flight test vehicles. We have looked at concepts that would be transitional vehicles for Ares I. Over the last two to three years, we have not looked at alternative vehicles to Ares I and Ares V. We have never looked at EELV. The results of those studies are clear in the ESAS that Ares I/V is the vehicle of choice. Hanley re-states ESAS.
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Chris Bergin
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« Reply #13 on: 08/19/2008 03:52 PM » |
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We had legimate questions about Ares, but we have only responded to these questions - on alternate concepts.
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Chris Bergin
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« Reply #14 on: 08/19/2008 03:55 PM » |
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Bill Harwood asking about the TMA (well have an image of it in our article btw). "It's like the shock absorbers in your car."
"We are actually flying systems like this on other spacecraft to damper the payload from the vehicle".
"It's basically springs and dampers".
"If you can vision a cylinder, with a mass in the middle of it, with springs at either side" on describing the TMA. "The motor is attached to the mass, it moves the mass when it senses the vibration and react."
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