中周波数帯域におけるパネル放射音低減検討

抄録

In vehicle development, structural design for noise reduction is becoming increasingly important. Noise reduction of panel is often achieved through add additional mass. However, this goes against the requirement of lightweight. And in mid-frequency range where mode density is high, the large amount of computational cost and time is required to establish effective countermeasures. Several methods have been proposed to define mode group, but they only apply to certain conditions. Therefore, the purpose of this study is to investigate mode grouping method leading to structural change for panel radiation noise reduction in mid-frequency range with high mode density. In this study, we evaluated by simulation using a frame-panel model and used FRF baseline estimate method to define mode group. Then, 46 modes in the target frequency range are classified into several groups by proposed method.