NUMERICAL ANALYSIS ON THE RESPONSES OF UNIMORPH AND BIMORPH PIEZOELECTRIC HARVESTERS IN TIME DOMAIN
DOI:
https://doi.org/10.36801/Keywords:
energy harvesting, piezoelectric, time response, finite element methodAbstract
The paper presents the assessment of the electric output rendered by a unimorph and a bimorph piezoelectric harvester, with one and respectively two active piezoceramic wafers, by means of numerical simulations. Expected sinusoidal voltages were obtained in time dependent study, with a time step corresponding to the eigenfrequency found after conducting an Eigenfrequency study. The terminal voltages obtained are in agreement with Euler-Bernoulli beam theory and with the distance of the piezoelectric layers from the neutral fibre. If Electrical Circuit physics is to be added to form a closed internal circuit, a single unified sinusoidal voltage response should be obtained, coinciding with the input vibration signal. The independent voltages of the layers of a piezoelectric structure with more than one layer (usually two or four layers) cannot be observed experimentally, as a harvester has only two terminals which pick the overall electric response from all the layers, giving a single alternating voltage output.
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