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Abstract

Harvesting energy from ambient vibration source is a promising method for providing a continuous source of power especially for low power microelectromechanical system (MEMS). Thus, multiple methods were proposed in order to overcome the linear resonant generator system. This paper presents experimental results on two modes (softening and bi-stable) the use of magnets for improving the functionality of energy harvesting device under constant input displacement. Two set of the experiments were conducted. The quasi-static measurement was conducted to investigate the system stiffness and the dynamic measurement was conducted to investigate the performance of the response across a frequency range. The results for four configurations which operate in attractive and repulsive mode with a fixed gap between the magnets are investigated. The result shows that there is a wider bandwidth for the device operating in the softening mode. By placing with the double attractive stationary magnets, the energy harvester shows the most effective softening non-linear system.