Abstract：The structural-acoustic optimization analysis is moving toward the field of vision for designer, because of exhibiting high potential in minimizing radiated noise, particularly for thin shell geometries. Acoustic design sensitivity analysis can provide insights into the effects of design variables on radiated acoustic performance. The coupled algorithm obtained by combining finite element and fast multipole higher order discontinuous boundary element is applied into the sensitivity analysis for the fluid-structure interaction problems. The proposed algorithm improves the calculation accuracy and decreases the memory storage. The design variable can be set as the fluid density, structural density, Poisson’s ratio, Yong’s modulus, structural shape size and so on. The sensitivity formulations for structural-acoustic system and radiated sound power with respect to the different design variables are derived based on the direct differentiation method, respectively. A numerical example with analytical solution is presented to demonstrate the validity and correctness of the proposed algorithm, and a complex practical example is presented to show the application ability of the proposed algorithm.
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