On a semi-actively controlled dynamic vibration damper

A semi-actively controlled vibration damper is introduced which is intended to add the damping property to the structure. The electrodynamic actuator is used to produce the damping force and the actuator mass is supported by an additional spring to cause the dynamic absorber. The back electromotive effect is utilized to produce the damping force which is controlled by the measured vibrating signal. System is simulated on a computer to evaluate the damping effect. The frequency response is calculated by changing the parameters, and the tuning condition is obtained to cause a good damping effect. A simple experimental apparatus is made to confirm the effect of this semiactive dynamic damper.