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Adaptive Control Allocation for Powered Descent VehiclesThe following work details a study into real-time failure adaptive control allocation method for powered descent vehicle systems. The motivation for this work is to enable future human and robotic missions utilizing a powered descent system to tolerate engine failures in flight without the loss of crew or assets. This study is conducted using a six degree-of-freedom trajectory simulation of a PDV (Powered Descent Vehicle) experiencing either a loss of thrust or an engine stuck full on failure scenario. Sequential least squares in the frequency domain is used on-board to process inertial measurement unit (IMU) data and generate an estimate of the PDV plant model, which is then fed to the guidance and control system. Data used by the sequential least squares method is generated from an in-flight maneuver. The work herein focuses on determining a maneuver that is least impactful to the PDV trajectory and enables a suitable plant model estimate. A 1.5-second-long maneuver with an amplitude of 5 percent throttle is determined to provide suitable data for the sequential least squares method to estimate a plant model. A PDV implementing this method can adapt to a single engine failure and continue to reach its touchdown conditions.
Document ID
20190000440
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Green, Justin S.
(NASA Langley Research Center Hampton, VA, United States)
Lindberg, Robert E., Jr.
(Virginia Univ. Charlottesville, VA, United States)
Date Acquired
February 7, 2019
Publication Date
January 8, 2018
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
NF1676L-27417
Meeting Information
Meeting: AIAA Guidance, Navigation, and Control Conference (GNC 2018)
Location: Kissimmee, FL
Country: United States
Start Date: January 8, 2018
End Date: January 12, 2018
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
WBS: WBS 736466.01.08.07.06.01
Distribution Limits
Public
Copyright
Public Use Permitted.
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