다중 전달함수합성법을 이용한 엔진마운트 시스템의 설계민감도 해석

다국어 초록 (Multilingual Abstract)

Analyzing acoustic-structural systems such as automobiles and aircraft, the FRF-based substructuring (FBS) method is one of the most powerful tools. In this paper, a general procedure for the parametric sensitivity anal­ysis of vibro-acoustic problems has been presented using the multi-domain FRF -based substructuring formula­tion. For an acoustic-structural system sub-structured by multiple domains, the substructuring formulation gives the reaction forces on the interface boundaries. The design sensitivity formula is obtained from the direct differ­entiation of the reaction force expression with respect to the design vector. As a practical application, the pro­posed design sensitivity formula is applied to an engine mount system of passenger car. An objective of the pro­blem is to identify the most effective engine mounts and bushes in minimizing the interior noise over the con­cerned rpm range. The comparison of the sensitivity results with those of the finite difference method shows ex­ccllent agreement. In addition, stiffness modifications of the mounts and bushes identified through the design sensitivity analysis lead to a successful decrease of the interior noise. This results show usefulness of the present method very well.