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22 July 2003 Piezoelectric energy harvesting using diaphragm structure
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Energy harvesting using piezoelectric material is not a new concept, but its generation capability has not been attractive for mass energy generation. For this reason, little research has been done on the topic. Recently, wearable computer concepts, as well as small portable electrical devices, are a few motivations that have ignited the study of piezoelectric energy harvesting again. The theory behind cantilever type piezoelectric elements is well known, but the transverse moving diaphragm elements, which can be used in pressure type energy generation is not yet fully developed. The power generation in a diaphragm depends on several factors. Among them, the thickness of each layer is important. In this paper, two diaphragm structures, unimorph and bi-morph, were used to calculate energy generation with varying thickness ratio using piezoelectric constitutive equation. The results of this analysis are presented with an eye toward guidelines for design of useful energy harvesting structure.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sunghwan Kim, William W. Clark, and Qing-Ming Wang "Piezoelectric energy harvesting using diaphragm structure", Proc. SPIE 5055, Smart Structures and Materials 2003: Smart Electronics, MEMS, BioMEMS, and Nanotechnology, (22 July 2003);

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