ウレタン・ゴムシートを積層したパネルの振動音響解析

抄録

The performance enhancement of the acoustic insulation is demanded for the high frequency (200Hz～500Hz) for interior noise of automobile. A carpet having urethane adhered to a rubber skin is generally laminated on a floor panel of an automobile. Even if the weight is the same, it has been confirmed experimentally that the panel vibration greatly differs in the case of urethane. In order to elucidate this mechanism, the vibration transmission rate was measured using a test apparatus in which a carpet was laminated on a panel simulating the floor of an automobile. In addition, we modeled this experimental apparatus with finite elements and analyzed the vibration during displacement excitation. Biot-Allard model was used for felt and urethane. We calculate using separately identified Biot parameters and compare with experimental results and introduce the change of vibration and obtained findings when material is changed.