G1001104 構造音響連成系の連成モード特性の同定に関する研究

抄録

Internal noise detected by passengers inside of the cabin of a car or an aircraft is caused by coupling vibration between the structure and the internal sound field. For practical purpose, it is most efficient to suppress the structural mode associated with acoustic dominant mode in order to reduce noise level in the cabin. Therefore, it would be beneficial to find the structure dominant mode. In this report, first, we suggested the determination technique for acoustic or structure dominant mode in the coupled system. Furthermore, in order to identify natural modes precisely, we examined experimental methods for frequency response measurement and modal parameter identification methods for the coupled system. This study proposes a determination technique for the natural mode of the coupled system. The validity of the proposed method is examined through the numerical simulation. In addition, the effectiveness of the multi-point excitation and acoustic excitation for the coupled system is illustrated.