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Extraction of Modal Parameters from Spacecraft Flight DataThe modeled response of spacecraft systems must be validated using flight data as ground tests cannot adequately represent the flight. Tools from the field of operational modal analysis would typically be brought to bear on such structures. However, spacecraft systems have several complicated issues: 1. High amplitudes of loads; 2. Compressive loads on the vehicle in flight; 3. Lack of generous time-synchronized flight data; 4. Changing properties during the flight; and 5. Major vehicle changes due to staging. A particularly vexing parameter to extract is modal damping. Damping estimation has become a more critical issue as new mass-driven vehicle designs seek to use the highest damping value possible. The paper will focus on recent efforts to utilize spacecraft flight data to extract system parameters, with a special interest on modal damping. This work utilizes the analysis of correlation functions derived from a sliding window technique applied to the time record. Four different case studies are reported in the sequence that drove the authors understanding. The insights derived from these four exercises are preliminary conclusions for the general state-of-the-art, but may be of specific utility to similar problems approached with similar tools.
Document ID
20100038325
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
James, George H. (NASA Johnson Space Center Houston, TX, United States)
Cao, Timothy T. (NASA Johnson Space Center Houston, TX, United States)
Fogt, Vincent A. (NASA Johnson Space Center Houston, TX, United States)
Wilson, Robert L. (NASA Johnson Space Center Houston, TX, United States)
Bartkowicz, Theodore J. (Boeing Co. Houston, TX, United States)
Date Acquired
August 25, 2013
Publication Date
January 1, 2010
Subject Category
Spacecraft Design, Testing And Performance
Report/Patent Number
JSC-CN-22001
Meeting Information
Meeting: International Modal Analysis Conference
Location: Jacksonville, FL
Country: United States
Start Date: January 31, 2011
End Date: February 3, 2011
Sponsors: Society of Experimental Mechanics, Inc.
Distribution Limits
Public
Copyright
Public Use Permitted.

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