Abstract
In this paper the authors proposed a new type of vibration control device that has variable inertial mechanism using half toroidal wheels, in order to get a function of vibration cut-off when vibration frequency equals to anti resonance frequency of inertial mass. The device consists of a piston cylinder, a ball screw, a ball nut, bearings, variable inertial force mechanism composed of half toroidal wheels and power transmission wheels. The device has a small inertial force when the power transmission is located in small ratio of contact radius between two half toroidal wheels by a servo motor, and a large inertial force in case of large ratio of contact radius, so the controlled inertial force can be derived continuously. Test device is made, and the resisting force characteristics are measured by using a shaking actuator. Next, simulations of frequency responses and seismic responses using a one-degree-of-freedom system with the device under proportional controlled are carried out. The effects of vibration suppression are confirmed numerically.
