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Calculation of Coupled Vibroacoustics Response Estimates from a Library of Available Uncoupled Transfer Function SetsThe design and theoretical basis of a new database tool that quickly generates vibroacoustic response estimates using a library of transfer functions (TFs) is discussed. During the early stages of a launch vehicle development program, these response estimates can be used to provide vibration environment specification to hardware vendors. The tool accesses TFs from a database, combines the TFs, and multiplies these by input excitations to estimate vibration responses. The database is populated with two sets of uncoupled TFs; the first set representing vibration response of a bare panel, designated as H(sup s), and the second set representing the response of the free-free component equipment by itself, designated as H(sup c). For a particular configuration undergoing analysis, the appropriate H(sup s) and H(sup c) are selected and coupled to generate an integrated TF, designated as H(sup s +c). This integrated TF is then used with the appropriate input excitations to estimate vibration responses. This simple yet powerful tool enables a user to estimate vibration responses without directly using finite element models, so long as suitable H(sup s) and H(sup c) sets are defined in the database libraries. The paper discusses the preparation of the database tool and provides the assumptions and methodologies necessary to combine H(sup s) and H(sup c) sets into an integrated H(sup s + c). An experimental validation of the approach is also presented.
Document ID
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Smith, Andrew
(NASA Marshall Space Flight Center Huntsville, AL, United States)
LaVerde, Bruce
(Engineering Research and Consulting, Inc. Huntsville, AL, United States)
Hunt, Ron
(Triumph Aerospace Systems Huntsville, AL, United States)
Fulcher, Clay
(Jacobs Engineering Group, Inc. Huntsville, AL, United States)
Towner, Robert
(Jacobs Engineering Group, Inc. Huntsville, AL, United States)
McDonald, Emmett
(Jacobs Engineering Group, Inc. Huntsville, AL, United States)
Date Acquired
August 26, 2013
Publication Date
April 23, 2012
Subject Category
Report/Patent Number
Meeting Information
Meeting: 53rd AIAA Structures, Structural Dynamics and Materials Conference
Location: Honolulu, HI
Country: United States
Start Date: April 23, 2012
End Date: April 26, 2012
Sponsors: American Inst. of Aeronautics and Astronautics
Distribution Limits
Public Use Permitted.
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