Abstract
In this study, it was discussed theoretically about the function of a planetary gear inerter from the view point of the influence to the frequency characteristics of vibration system which it incorporated. In the previous paper, we performed formulation of the dynamic characteristics and investigation of function of a planetary gear inerter which is one of the practical inerter. According to this investigation, we found out that the planetary gear inerter could be interpreted to having the combination of three different functions, ideal inerter function, moment of inertia redistribution function, and directly connected moment of inertia. In this paper, we aimed to clarify the influences of each function of planetary gear inerter on dynamic characteristics of torsional vibration system. In order to achieve that, we formulated the 2 types of 1DOF torsional vibration system which the planetary gear inerter incorporated and investigate these functions analytically. As the result, we found out that the ideal inerter function which is one of the function of planetary gear inerter could be interpreted as negative stiffness between two terminals which is proportional to the excitation frequency. Because of this study, it could be expected to utilize inerter for vibration system design at the view point of new function.
