Structure-induced noise and vibration control at low frequency is an important area of research for reducing the noise level generated by various structural parts. In automotive applications, for example, the noise level of a passenger compartment can be reduced by changing the structural design parameters. This paper presents a design sensitivity analysis of a sequential structural-acoustic problem in which structural and acoustic behaviours are de-coupled. A frequency-response analysis is used to obtain the dynamic behaviour of an automotive structure, while the boundary element method is used to salve the pressure response of an interior, acoustic domain. For the purposes of design sensitivity analysis, a direct differentiation method and an adjoint variable method are presented. In the adjoint variable method, an adjoint load is obtained from the acoustic boundary element re-analysis, while the adjoint solution is ca1culated from the structural dynamic re-analysis. The evaluation of pressure sensitivity only involves a numerical integration process for the structural part. The proposed sensitivity results are compared to finite difference sensitivity results with excellent agreement.
Design sensitivity analysis for sequential structural-acoustic problems
Sensitivitätsanalyse für sequentielle strukturakustische Probleme
Journal of Sound and Vibration ; 263 , 3 ; 569-591
2003
23 Seiten, 10 Bilder, 4 Tabellen, 24 Quellen
Article (Journal)
English
Design sensitivity analysis for sequential structural-acoustic problems
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