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Force Limiting Vibration Tests Evaluated from both Ground Acoustic Tests and FEM Simulations of a Flight Like Vehicle System AssemblyMarshall Space Flight Center has conducted a series of ground acoustic tests with the dual goals of informing analytical judgment, and validating analytical methods when estimating vibroacoustic responses of launch vehicle subsystems. The process of repeatedly correlating finite element-simulated responses with test-measured responses has assisted in the development of best practices for modeling and post-processing. In recent work, force transducers were integrated to measure interface forces at the base of avionics box equipment. Other force data was indirectly measured using strain gauges. The combination of these direct and indirect force measurements has been used to support and illustrate the advantages of implementing the Force Limiting approach for equipment qualification tests. The comparison of force response from integrated system level tests to measurements at the same locations during component level vibration tests provides an excellent illustration. A second comparison of the measured response cases from the system level acoustic tests to finite element simulations has also produced some principles for assessing the suitability of Finite Element Models (FEMs) for making vibroacoustics estimates. The results indicate that when FEM models are employed to guide force limiting choices, they should include sufficient detail to represent the apparent mass of the system in the frequency range of interest.
Document ID
20140008560
Document Type
Conference Paper
Authors
Smith, Andrew
(NASA Marshall Space Flight Center Huntsville, AL, United States)
LaVerde, Bruce
(Engineering Research and Consulting, Inc. Huntsville, AL, United States)
Waldon, James
(Jacobs Engineering Group, Inc. Huntsville, AL, United States)
Hunt, Ron
(BRC, Inc. Huntsville, AL)
Date Acquired
June 30, 2014
Publication Date
March 24, 2014
Subject Category
Acoustics
Launch Vehicles And Launch Operations
Report/Patent Number
M13-2993
Meeting Information
Meeting: Aerospace Testing Seminar
Location: Los Angeles, CA
Country: United States
Start Date: March 24, 2014
End Date: March 27, 2014
Sponsors: Aerospace Corp.
Distribution Limits
Public
Copyright
Public Use Permitted.
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