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Ares-I-X Stability and Control Flight Test: Analysis and PlansThe flight test of the Ares I-X vehicle provides a unique opportunity to reduce risk of the design of the Ares I vehicle and test out design, math modeling, and analysis methods. One of the key features of the Ares I design is the significant static aerodynamic instability coupled with the relatively flexible vehicle - potentially resulting in a challenging controls problem to provide adequate flight path performance while also providing adequate structural mode damping and preventing adverse control coupling to the flexible structural modes. Another challenge is to obtain enough data from the single flight to be able to conduct analysis showing the effectiveness of the controls solutions and have data to inform design decisions for Ares I. This paper will outline the modeling approaches and control system design to conduct this flight test, and also the system identification techniques developed to extract key information such as control system performance (gain/phase margins, for example), structural dynamics responses, and aerodynamic model estimations.
Document ID
20080040163
Document Type
Conference Paper
Authors
Brandon, Jay M. (NASA Langley Research Center Hampton, VA, United States)
Derry, Stephen D. (NASA Langley Research Center Hampton, VA, United States)
Heim, Eugene H. (NASA Langley Research Center Hampton, VA, United States)
Hueschen, Richard M. (NASA Langley Research Center Hampton, VA, United States)
Bacon, Barton J. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 24, 2013
Publication Date
September 9, 2008
Subject Category
Spacecraft Design, Testing and Performance
Report/Patent Number
AIAA-2008-7807
Meeting Information
AIAA Space 2008 Conference and Exposition(San Diego, CA)
Funding Number(s)
WBS: WBS 136905.10.10.20.20
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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