Dynamic characteristic and application of a metamaterial plate with piezoelectric vibrators
Date Issued
2015
Date
2015
Author(s)
Hsiao, Chiao-Yu
Abstract
In this thesis, we combine local resonance characteristics of metamaterials and direct piezoelectric effect of piezoelectric material, design metamaterials sheet which can transform vibration energy into electrical energy. It expects to provide the design concept of the piezoelectric resonator of micro-energy harvesting. To explore the local resonance influence for the metamaterial that add direct piezoelectric effect. First we derivate the theory, then make a motion eqation for Metamaterials plate which have direct piezoelectric effect. The analysis of actual motion can be divided into finite element analysis simulation and experiments in two parts. First we use computer-assisted analysis software “COMSOL” to simulate, design several different characteristic frequencies of resonance mass-in-mass, and use different sort order, different mass-in-mass unit quantity variable of above mass-in-mass unit to combination to have local resonance properties of metamaterials sheet, then base on the metamaterials sheet which we design, use structural mechanics module to analysis when the model under load cause phenomena of Vibration due to local resonance of structure, but also use piezoelectric modules to simulate piezoelectric output. Experimental parts use the loads which is given fixed-frequency by shaker, then base on consisting of a single mass-in-mass unit for a single resonant metamaterials plate to do simple harmonic test. Finally, compare the result for simulation and experimental. Since metamaterials vibration of the original design was not as expected, it also presents double resonance and multiple resonance metamaterials models that are quite different with single resonance metamaterials models, then use Comsol’s solid machanics models analysis the consequent of local resonance. Finally, this study successfully designed metamaterials plates which have single resonance, double resonance and multiple resonance effect, but because of the metamaterials designed itself are too thin, cause metamaterials sheets model type also slightly in the low frequency region , it will affect the vibration of the expected results.
Subjects
metamaterial
local resonance
piezoelectric effect
power generation by vibration
Type
thesis
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