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A low frequency piezoelectric power harvester using a spiral-shaped bimorph

Science China(Physics,mechanics & Astronomy) 2006年第6期49卷 649-659页

作者： hu yuantai1,2.hu hongping2.& yang jiashi3.1. institute of mechanics and sensing technology,{2. {3. University,changsha 410083.China 2. Department of mechanics,huazhong University of Science and technology,Wuhan 43.074,China 3. Department of Engineering mechanics,University of Nebraska,Lincoln,NE 68588-052.,USA 1. institute of mechanics and {2. {3. Central South University Changsha 410083 China 2. Department of mechanics Huazhong University of Science and Technology Wuhan 430074 China 3. Department of Engineering mechanics University of Nebraska Lincoln NE 68588-0526 USA

We propose a spiral-shaped piezoelectric bimorph power harvester operating with coupled flexural and extensional vibration modes for applications to low frequency energy sources. A theoretical analysis is performed and the computational results show that the spiral structure has relatively low operating frequency compared to beam power harvesters of the same size. It is found that to optimize the performance of a piezoelectric spiral-shaped harvester careful design is needed.

关键词： spiral-shaped bimorph,piezoelectric harvester,power density.

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AN EXACT ANALYSIS OF FORCED THICKNESS-TWIST VIBRATIONS OF MULTI-LAYERED PIEZOELECTRIC PLATES

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Acta Mechanica Solida Sinica 2007年第3期20卷 211-218页

作者： hu hongping Chen Ziguang {2. {3. hu yuantai Department of mechanics School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan 430074 China institute of mechanics and {2. {3. School of Civil Engineering and Architecture Central South University Changsha 410082 China Department of Engineering mechanics University of Nebraska Lincoln NE 68588 USA

This paper deals with the thickness-twist vibration of a multi-layered rectangular piezoelectric plate of crystals of 6 mm symmetry or polarized ceramics. An exact solution is obtained from the three-dimensional equations of linear piezoelectricity. The solution is useful to the understanding and design of composite piezoelectric devices. A piezoelectric resonator, a piezoelectric transformer, and a piezoelectric generator are analyzed as examples.

关键词： piezoelectricity plate resonator transformer generator

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ELECTRICALLY FORCED VIBRATION OF A THICKNESS-TWIST MODE PIEZOELECTRIC RESONATOR WITH NON-UNIFORM ELECTRODES

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Acta Mechanica Solida Sinica 2007年第3期20卷 266-274页

作者： yang jiashi Chen Ziguang {2. {3. Key Laboratory for Advanced Materials and Rheological Properties of Ministry of Education Xiangtan University Xiangtan 411105 China Department of Engineering mechanics University of Nebraska Lincoln NE 68588-0526 USA institute of mechanics and {2. {3. School of Civil Engineering and Architecture Central South University Changsha 410083 China Department of mechanics University of Huazhong University of Science and Technology Wuhan 430074 China

We study the effect of electrodes with varying thickness on thickness-twist vibration of a piezoelectric plate resonator of crystals of 6 mm symmetry. An exact theoretical analysis is performed. Results show that non-uniform electrodes have a strong effect on mode shapes, and suggest the possibility of using nonuniform electrodes for strong energy trapping.

关键词： energy trapping thickness-twist mode non-uniform electrodes resonator

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