ユニットモードの固有値変更による騒音低減手法の提案

（ロードノイズへの適用）

抄録

The new idea is proposed that the vibration is transmitted between the smallest unit of component modes, and the combination of the modes mentioned above describes the dynamic characteristics of the entire system. Based on this idea, the vibration mechanism can be represented in a transmission path diagram using these modes, and the path can be changed by shifting the eigenvalues. In this paper, an example of applying this technique to the vehicle FE model for reducing road noise is introduced. The optimization aimed at reducing vibration response clarified the following two measures are proved to be effective. One is the suspension member bending mode should be placed at a higher frequency than the acoustic cavity back and forth mode, and the other is the windshield membrane 1st mode should be separated from the acoustic cavity back and forth mode. It seems to be applicable to many other vehicles, and it is believed a general solution has been obtained based on the characteristics of the components.