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Vibration Analysis of the Space Shuttle External Tank Cable Tray Flight Data With and Without PAL RampExternal Tank Cable Tray vibration data for three successive Space Shuttle flights were analyzed to assess response to buffet and the effect of removal of the Protuberance Air Loads (PAL) ramp. Waveform integration, spectral analysis, cross-correlation analysis and wavelet analysis were employed to estimate vibration modes and temporal development of vibration motion from a sparse array of accelerometers and an on-board system that acquired 16 channels of data for approximately the first 2 min of each flight. The flight data indicated that PAL ramp removal had minimal effect on the fluctuating loads on the cable tray. The measured vibration frequencies and modes agreed well with predicted structural response.
Document ID
Document Type
Technical Memorandum (TM)
Walker, Bruce E. (Channel Islands Acoustics Camarillo, CA, United States)
Panda, Jayanta (Ohio Aerospace Inst. Brook Park, OH, United States)
Sutliff, Daniel L. (NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 24, 2013
Publication Date
March 1, 2008
Subject Category
Spacecraft Design, Testing and Performance
Report/Patent Number
AIAA Paper 2008-312
Meeting Information
46th Aerospace Sciences Meeting and Exhibit(Reno, NV)
Funding Number(s)
WBS: WBS 510.505.04.03.01
Distribution Limits
Work of the US Gov. Public Use Permitted.

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NameType 20080018471.pdf STI