Size, shape and topology optimization of coupled acoustic-structural systems

This paper studies a simultaneous optimization model for low-frequency coupled structural-acoustic problems, including three optimization levels, i.e., size, shape and topology variables. Adjoint subspace iteration method is adopted to deal with eigenfrequency problems of acoustic-structural coupled systems. Numerical methods of sensitivity analysis and design optimization are reviewed. Detailed formats of sensitivity analysis are given for different design variables. The direct acoustical characteristic, interior average sound pressure level (SPL) is chosen as the design performance for the simultaneous optimization. This work is an extension of the general-purpose FE analysis and optimization software—JIFEX developed by Dalian University of Technology. Numerical examples and engineering application are given in this paper to demonstrate the effectiveness of the methods and program.