解析 SEA 法による複層梁のモデル化と振動エネルギ伝搬に関する検討

抄録

In recent years, to improve fuel economy, automobile bodies need to be lightweight, so the usage of lightweight materials such as high strength steel, aluminum, and fiber-reinforced plastics, are increasing. However, weight reduction often gives a poor performance of noise and vibration performance, so it is important to achieve both weight reduction and noise and vibration performance. In addition, when the powertrain changes from an engine to a motor, the frequency of noise and vibration have become higher, and the elimination of engine and exhaust noise, which used to be the main source of noise, has changed the composition of noise contribution, and road noise, which used to be masked by these sounds, has become more noticeable. Therefore, it is important to evaluate the high-frequency noise and vibration performance of lightweight structures. In this study, analytical statistical energy analysis (SEA) is used to evaluate the vibrations in multi-material structures. A method to calculating coupling loss factors (CLF) between multi-layered beams is proposed. In this method, multi-layered beams are treated as homogeneous beams. It was shown that the multi-layered beam can reduce vibration with high weight efficiency.