Effect of Broadening the Resonant Frequency Band in a Self-Resonant System on Vibration Power Generation

Abstract

　When a system consisting of a beam and a movable mass (slider) is vibrated, the slider may move along the beam, resulting in a change in the natural frequency of the system and resonances, including nonlinearities. This phenomenon, called passive self-resonance, is caused by the nonlinear coupling between the vibration of the beam and the motion of the slider, and can exhibit interesting behavior. In particular, the passive tuning of natural frequencies and the wide excitation frequency bandwidth over which resonance can occur have attracted much interest for applications in vibration power generation. In this paper, considering an electrical system coupled with the vibration of a beam-slider system that undergoes self-resonance, we attempt to expand the excitation frequency bandwidth in which sufficient power can be generated, and evaluate this effect on its vibration energy harvesting.