Name : [in Japanese]
Date : July 07, 2022 - July 08, 2022
A structural optimization method of subsystems to realize desired SEA parameters was proposed by the authors in the past studies. This method is based on a combination of SEA and FEM calculation, calculating repeatedly until satisfying the value of objective functions under arbitrary constraints. In this paper, the method is validated through numerical analyses, using a finite element method, of a multiple plates partially composed of L shaped, after the sensitivity analysis for the sound energy of the evaluation point due to the fluctuation of loss factors, the subsystem is grouped into a plural elements for the extracted L shaped part, and the each grouped element is set as a design variable, which should take a discrete value, the total mass is taken as a constraint function in order to maximize CLF32 at one frequency band. As a result of optimization, the sound pressure level was reduced by maximizing the value of CLF32 in the target frequency band. Finally, a comparison with a conventional FRF based optimization was shown.
