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A Patch Density Recommendation based on Convergence Studies for Vehicle Panel Vibration Response resulting from Excitation by a Diffuse Acoustic Field
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Author and Affiliation:
Smith, Andrew(NASA Marshall Space Flight Center, Huntsville, AL, United States);
LaVerde, Bruce(Engineering Research and Consulting, Inc., Huntsville, AL, United States);
Jones, Douglas(Jacobs Engineering Group, Inc., Huntsville, AL, United States);
Towner, Robert(Jacobs Engineering Group, Inc., Huntsville, AL, United States);
Hunt, Ron(Bevilacqua Research Corp., ESSSA Group, Huntsville, AL, United States)
Abstract: Fluid structural interaction problems that estimate panel vibration from an applied pressure field excitation are quite dependent on the spatial correlation of the pressure field. There is a danger of either over estimating a low frequency response or under predicting broad band panel response in the more modally dense bands if the pressure field spatial correlation is not accounted for adequately. Even when the analyst elects to use a fitted function for the spatial correlation an error may be introduced if the choice of patch density is not fine enough to represent the more continuous spatial correlation function throughout the intended frequency range of interest. Both qualitative and quantitative illustrations evaluating the adequacy of different patch density assumptions to approximate the fitted spatial correlation function are provided. The actual response of a typical vehicle panel system is then evaluated in a convergence study where the patch density assumptions are varied over the same finite element model. The convergence study results are presented illustrating the impact resulting from a poor choice of patch density. The fitted correlation function used in this study represents a Diffuse Acoustic Field (DAF) excitation of the panel to produce vibration response.
Publication Date: Apr 08, 2013
Document ID:
20130013856
(Acquired Jul 11, 2013)
Subject Category: ACOUSTICS
Report/Patent Number: M12-2090
Document Type: Conference Paper
Meeting Information: 54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference; 8-11 Apr. 2013; Boston, MA
Meeting Sponsor: American Inst. of Aeronautics and Astronautics; Reston, VA, United States
Financial Sponsor: NASA Marshall Space Flight Center; Huntsville, AL, United States
Organization Source: NASA Marshall Space Flight Center; Huntsville, AL, United States
Description: 13p; In English; Original contains color illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: ACOUSTIC EXCITATION; ACOUSTICS; CONVERGENCE; FREQUENCY RANGES; LOW FREQUENCIES; PRESSURE DISTRIBUTION; SOUND FIELDS; VIBRATION
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