Host: The Japan Society of Mechanical Engineers
Name : The 15th International Conference on Motion and Vibration(MoViC 2020)
Date : September 09, 2020 - September 11, 2020
In this study, we propose a design method of semi-active control systems by using a variable inertia mass damper (IMD) for structural systems subject to seismic disturbances. The variable IMD is a semi-active vibration control device whose inertia mass coefficient can be changed by a command signal in a real time manner. The mathematical model of the variable IMD is obtained by considering the dynamic delay of the variable inertia mass coefficient subject to change of the command signal. The delay is modeled as a 1st order lag system. For the mathematical model of the structural system with the variable IMD, a semi-active control law that generates the command signal to change the inertia mass coefficient is proposed. It is based on the reference active control output and referred to as the output emulation approach (Hiramoto et al., 2016). The reference active control system is a virtual system obtained by assuming installation of a force actuator on the structural system instead of the semi-active control device. In the output emulation approach, the variable inertia mass coefficient of the variable IMD is changed so that the predicted control output of the semi-active control system becomes close to that of the reference active control system. The optimal set of design parameters in obtaining the active control law for the reference active control system is searched. A simulation study for a 3-dof model of the existing benchmark building shows the effectiveness of the proposed semi-active control method with the variable IMD.
