Parametric optimization of complex systems using a multi-domain FRF-based substructuring method

A general procedure for a parametric sensitivity analysis of a complex system has been presented using a multi-domain FRF-based substructuring formulation. The direct differentiation of reaction forces on the interface boundaries with respect to the design vector is used to obtain a design sensitivity formula of responses in any substructure. A simple example for a ladder structure is introduced to verify the formulation numerically. The proposed method is applied to an optimization problem of an engine mount system to minimize the interior sound over the concerned rpm range. The optimized interior noise in a passenger car shows that the proposed design sensitivity formulation is efficient and accurate.