Design sensitivity analysis for sequential structural-acoustic problems |
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| Authors: | Nam H Kim Kyung K Choi N Vlahopoulos MP Castanier |
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| Institution: | a Department of Mechanical and Aerospace Engineering, College of Engineering, University of Florida, Gainesville, FL 32611, USAb Center for Computer-Aided Design, Department of Mechanical Engineering, College of Engineering, The University of Iowa, Iowa City, IA 52242-1000, USAc Department of Naval Architecture and Marine Engineering, The University of Michigan, Ann Arbor, MI 48109, USAd Department of Mechanical Engineering, The University of Michigan, Ann Arbor, MI 48109, USA |
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| Abstract: | A design sensitivity analysis of a sequential structural-acoustic problem is presented in which structural and acoustic behaviors are de-coupled. A frequency-response analysis is used to obtain the dynamic behavior of an automotive structure, while the boundary element method is used to solve 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 calculated 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. |
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