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On Piezoelectric Vibration Generator for Self-Powered Wireless Sensor Network

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The energy management technology of wireless sensor network has become a technical bottleneck. Environment energy harvesting device based on vibration for wireless sensor networks provides free energy, which is the fundamental solution to solve the energy supply of self-powered node. In order to improve generating capacity under given dimension, the finite element analysis model of piezoelectric microcantilever vibration generator has been presented. The relations between generating capacity and structure parameters, such as the thickness ratio, the length and the width of microcantilever were obtained. The output voltages of vibration generator with unimorph or bimorph microcantilever increase linearly with the length, while decrease in inverse proportion with the width. The optimal thickness ratios responding to maximum output voltage for unimorph is different with for bimorph. And the maximum output voltage of bimorph microcantilever vibration generator is about two times that of unimorph microcantilever. If the material attribute, structural parameters and excitation condition of vibration generator are the same, the output voltage of bimorph microcantilever is higher than that of unimorph microcantilever, and the resonant frequency of bimorph microcantilever is lower than that of unimorph microcantilever.


Document Type: Research Article


Publication date: 2011-10-01

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