断面変形を伴う骨格構造上の波動モード間で反射の増減が発生するメカニズムの解明

抄録

On mid-frequency, if you focus on the frame structure related with vibration transmission mainly, It is difficult to understand the mechanism of transmission between frame structure quantitatively and suggest the effective method to reduce vibration transmission because of the shape of wave modes at the frame structure with cross-sectional deformation. In this research, the method that is the structure change to make the transmitted wave that has the wave mode with cross-sectional deformation reflect is considered. Firstly, the hypothesis that reflection coefficients increase because of the incoincidence of wave modes can be considered. After that, it is quantitated, the idea to increase the wave reflection can be cleared by comparing with reflection coefficient. If the mechanism wave refection increases were figured out, it would be beneficial to design without calculating reflection coefficients. It is possible to calculate reflection coefficient, however, the more the number of wave modes increase, the more it becomes difficult to calculate it automatically and it costs a lot. Moreover, when the structure is changed, it is difficult to devise the structure by optimization because design conditon including strength has to be taken into account except for vibration transmission. Consequently, it would be beneficial to propose the structure at the consept design if the mechanism wave refection increases could be simplified.