Vibration design for coupled structures by using FRF amplitude coefficient of specified component

Abstract

In recent years，research has been conducted on the effects of structural changes in subsystems on the global system for the purpose of optimizing the vehicle development process．However，no method has been established that can be applied to complex systems such as vehicles．Therefore，the goal of this study is to propose a new method that can be applied to vehicle models and provides guidelines for structural changes of subsystems to improve the vibration characteristics of the global system．In this study，we consider a structural modification in which the FRF of the subsystem is changed uniformly by using the amplitude coefficient γ ．The proposed method can predict the natural frequencies and the maximum value of FRF after the structural change．Both are formulated using transfer function synthesis method as the basic theory．By combining the prediction of natural frequencies with the prediction of FRF maximum value，a guideline for structural modification can be obtained．In fact，the proposed method is applied to a vehicle model and the structural modification is carried out according to the obtained guideline，and the FRF is successfully reduced．