Abstract
Abstract The article proposes two different compositions (Single-layer and Multi-layer) of the MEMS (Micro-electromechanical system) based wide band piezoelectric energy harvester operating under a non-linear multi-mode configuration. The conventional type of piezoelectric harvesters usually generates voltage in a smaller range of bandwidth at large frequencies, which is a main disadvantage of the typical harvesters. In this study, the piezoelectric energy harvester is designed with multiple cantilever beams arranged in an equipoise manner, which consists of multiple proof masses, located at different positions utilized for the bandwidth improvement of the energy harvester. Genetic Algorithm (GA) based computerized optimization technique is proposed to identify the optimal parameters of the harvester. The main goal of the proposed work is the minimization of frequency with enlarged bandwidth, for improving the performance of the designed optimized harvester using AlN as the piezoelectric material. From the comparison analysis of the single-layer and multi-layer harvesters, the Multi-layer piezoelectric harvester produces maximum power (5.23 µW) at lower frequency (211.1 Hz) with enlarged bandwidth (19.1 Hz) respectively.
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