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Space Shuttle Redesigned Solid Rocket Motor nozzle natural frequency variations with burn timeThe effects of erosion and thermal degradation on the Space Shuttle Redesigned Solid Rocket Motor (RSRM) nozzle's structural dynamic characteristics were analytically evaluated. Also considered was stiffening of the structure due to internal pressurization. A detailed NASTRAN finite element model of the nozzle was developed and used to evaluate the influence of these effects at several discrete times during motor burn. Methods were developed for treating erosion and thermal degradation, and a procedure was developed to account for internal pressure stiffening using differential stiffness matrix techniques. Results were verified using static firing test accelerometer data. Fast Fourier Transform and Maximum Entropy Method techniques were applied to the data to generate waterfall plots which track modal frequencies with burn time. Results indicate that the lower frequency nozzle 'vectoring' modes are only slightly affected by erosion, thermal effects and internal pressurization. The higher frequency shell modes of the nozzle are, however, significantly reduced.
Document ID
19910057123
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Lui, C. Y.
(Thiokol Corp. Brigham City, UT, United States)
Mason, D. R.
(Thiokol Corp. Brigham City, UT, United States)
Date Acquired
August 15, 2013
Publication Date
June 1, 1991
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
AIAA PAPER 91-2301
Accession Number
91A41746
Funding Number(s)
CONTRACT_GRANT: NAS8-30490
Distribution Limits
Public
Copyright
Other

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