214 非線形振動子を有する電磁型振動エネルギ変換器(セッション7 診断システム(2))

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This study concerns a electromagnetic vibration energy harvester with a nonlinear oscillator. A vibrational energy harvester is an energy-harvesting device that is designed to collect extra energy from vibrating equipments, which is ordinarily discarded as heat. A conventional energy harvester is equipped with a linear oscillator, and designed so as to get large power by matching the natural frequency of the oscillator to the frequency of the input vibration to make a resonance. The problem is, however, that, if the input frequency changes even in a slight amount, the performance can become extremely worse because of the high-Q design. In this study, a vibration energy harvester using a nonlinear oscillator is proposed, which is designed to generate larger electric power for larger frequency range. This harvester consists of a nonlinear oscillator with hardening spring, a convertor, and a self-excitation circuit with a variable resistance of which value is controlled from negative to positive as a function of the amplitude of the response. This controlled resistance enables the oscillator to be entrained by the excitation in a large amplitude solution. In this paper, the impedance matching condition of the load resistance is particularly focused on to improve the regenerated power when entrained in a large amplitude solution. It is suggested that the impedance matching condition of the nonlinear energy harvester may be much different from that of the linear one, and the lower impedance may provide the higher regenerated power.
2010-12-15

214 非線形振動子を有する電磁型振動エネルギ変換器(セッション7 診断システム(2))

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