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A new method of regenerating electric power from the vibration energy is presented. An electro-dynamic actuator is controlled by a relay controller to regenerate electric power during the highspeed motion of the actuator. For the lowspeed motion, an active control algorithm is applied to the same actuator to achieve good damping performance. This idea can be applied to a vehicle suspension system which is composed of electrodynamic actuator and spring. The system is simulated on a computer to evaluate the vibration damping property and energy regenerative capability. A simple experimental apparatus is made to confirm its capability.

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