609 非線形振動子を用いた広帯域型振動エネルギ変換器(エナジーハーベスト・ヘルスモニタリング,OS-12 スマート構造システム,総合テーマ「伝統を,未来へ!」)

概要

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This study concerns a vibration energy harvester with a nonlinear oscillator. A vibrational energy harvester is an energy-harvesting device that can collect extra energy from vibrating equipments, which is ordinarily descarded as heat. A conventional vibrational generator consists of a linear oscillator and an electro-mechanical transducer that converts vibrational energy into electric energy and vice versa. This type of energy harvesters are 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. 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. Theoretical and numerical analysis show the large amplitude of the oscillator's response in a wide frequency range and a significant improvement in the regenerated power compared with the one without control.
2010-09-14