Piezoelectric material has been extensively used in energy harvesting technologies. However, most commercially available piezoelectric materials, Pb [ZrxTi1-x] O3 (PZT), contains of more than 60 weight percent lead (Pb) . Because of its extremely hazardous effects of lead elements, there is a strong motive to substitute PZT by new lead-free materials with comparable properties to those of PZT. This paper built an equivalent circuit model of a cantilevered piezoelectric bimorph energy harvester (Mech-PEH), which is made by lead-free piezoelectric materials Barium titanate (BaTiO3) (BT) and Pb [ZrxTi1-x] O3 (PZT). The output electrical voltage and output power of the lead-free energy harvester are studied via the Finite Element (FEM) analysis. The energy harvesting performance of the lead free piezoelectric bimorph are compared with the same size high performance PZT bimorph. The factors contribute to the piezoelectric material’s behavior are described. The output voltage and power are computed with the transient vibrations of piezoelectric bimorph cantilevers that are subjected to plucking forces. Due to the complicated fabrication process of lead free piezoelectric samples, a typical quarter size samples are usually produced and examined by researchers before the mass production of formal rectangular and circular shape bimorphs. Therefore, in this work, energy harvesting efficiency of two different shapes of bimorphs was studied: 1) two quarter size circular ceramics bonded to a rectangular brass plate; 2) two rectangular shape ceramics bonded to the same dimensions of rectangular metal substrate.
|Commitee:||Kweon, Soondo, Zhang, Mingshao|
|School:||Southern Illinois University at Edwardsville|
|Department:||Mechanical and Industrial Engineering|
|School Location:||United States -- Illinois|
|Source:||MAI 58/01M(E), Masters Abstracts International|
|Keywords:||Barium titanate, Ceramics bimorphs, Energy harvesting, Lead-free piezoelectric, Piezoelectric, Smart materials|
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