Session: SE-02-01 Seismic Isolation and Structural Dynamics-1

Paper Number: 123003

123003 - Sensor-Less Semiactive Damper That Automatically Switches Damping Force Using 3-Phase Motor and Relay 

The author developed a sensor-less semiactive damper that consists of a three-phase direct drive motor whose damping force is automatically switched by a rectifier circuit and relay, using the motor instead of a speed sensor. It is more compact and has higher performance compared to previous damper using DC motor. The direct drive motor is attached to the end of the shaft of the ball screw mechanism.　Since the voltage between the motor terminals is proportional to the rotation speed, when the speed exceeds a border level, the voltage rises to the operating voltage of the relay, which closes the load circuit of the relay and causes a short circuit between the terminals, switching to the high damping force. The resisting force characteristics of the damper were measured by experiments, and a theoretical equation was derived. Next, the damper was attached to a one-degree-of-freedom system, and seismic wave excitation experiments were conducted. Experimental results show a little advantage in vibration reduction in the semiactive case which switches automatically, compared to a passive case where the damping coefficient of the damper is not switched. The experimental results agree with the calculated results mostly, and vibration control effect of the damper is confirmed.

Presenting Author: Taichi Matsuoka Meiji University

Presenting Author Biography: Professor of Meiji University, Japan. Seismic engineering technical committee member of PVP division, and TPR 2020-2021. Outstanding paper award of PVP2006.

Authors:

Taichi Matsuoka Meiji University