Abstract
We demonstrate the detailed analysis for conversion of piezoelectric properties into compliance matrix and simulate a series bimorph configuration for vibration based energy generation. Commercially available software COMSOL Multiphysics was used to apply boundary conditions for optimization of geometric parameters such as length, width and thickness of piezoelectric layer to study voltage and power characteristics of the harvester. The resulting energy harvester was found to generate 1.73 mW at 53.4 Hz across a 3MW load with an energy density of 13.08mJ/cm3. We also investigated feasibility of this model by comparing it with existing experimental data of known piezoelectric ceramic compositions and found good correlation between the two.
Highlights
Recent advances in micro-sensors technology have increased the need for cheaper and more efficient energy harvesting devices to provide on-board power
To overcome the issue of low power output level, Liu et al (2008) studied a micro array of a multi-layered composite cantilever beam generating 3.98μw of effective electric power, yet the study did not show results on the micro-array system’s frequency band coverage
We present study of detailed conversion of any polycrystalline anisotropic piezoelectric material properties to anisotropic compliance matrix that were directly used in simulation to obtain mechanical and electrical responses
Summary
Recent advances in micro-sensors technology have increased the need for cheaper and more efficient energy harvesting devices to provide on-board power. Literature suggests that many piezoelectric energy harvesting power generators have emerged in the past decade: Fang et al (2006) studied a six-layer composite cantilever beam design, which has a 2.16μw electric power output under a resonance frequency of 608Hz. The natural frequency can be tuned by adjusting the weight of the tip mass. To overcome the issue of low power output level, Liu et al (2008) studied a micro array of a multi-layered composite cantilever beam generating 3.98μw of effective electric power, yet the study did not show results on the micro-array system’s frequency band coverage ( natural frequency of three individual beams is presented in the study). We use COMSOL Multiphysics to determine the fundamental mode of piezoelectric device by Eigen frequency analysis.
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