# Vibration-based energy harvesting with a clamped piezoelectric circular diaphragm: analysis and identification of optimal structural parameters

## Abstract

Due to many potential promising applications, vibration-based piezoelectric energy harvesters (VPEH) with a clamped circular diaphragm are an intensively studied design in the field of piezoelectric energy harvesters. Nonetheless, their performance still leaves space for improvement, which is the primary target of this article. We define two structural parameters, namely the ratio piv 1 between the bonding area and the piezoceramic diameter as well as the ratio piv 2 between the clamping rim and the substrate diameter, to characterize these structures. A vibration model is developed in order to provide an analytical foundation for the identification of optimal parameters piv 1 and piv 2. It is verified by finite-element simulations and substantive experiments. The results allow to relate the device performance, including resonance frequency and output power, to piv 1 and piv 2. This shows that the output rises with increasing piv 2, and that the maximum output for a given piv 2 always lies in the range ${\varpi }_{1}\in (\mathrm{0.1,}\,0.2).$ Based on this observation, an improved harvester structure with a pre-stress of 0.3 N is identified, that exhibits a matched power up to 16.3 mW at 219 Hz. This demonstrates the feasibility to achieve VPEHs with higher outputs and lower eigenfrequency through simultaneous modification of piv 1 and piv 2, which is highly beneficial for low-frequency energy harvesting.

Item Type: Article 2017 Yang, Yangyiwei and Wang, Shuai and Stein, Peter and Xu, Bai-Xiang and Yang, Tongqing Vibration-based energy harvesting with a clamped piezoelectric circular diaphragm: analysis and identification of optimal structural parameters English Due to many potential promising applications, vibration-based piezoelectric energy harvesters (VPEH) with a clamped circular diaphragm are an intensively studied design in the field of piezoelectric energy harvesters. Nonetheless, their performance still leaves space for improvement, which is the primary target of this article. We define two structural parameters, namely the ratio piv 1 between the bonding area and the piezoceramic diameter as well as the ratio piv 2 between the clamping rim and the substrate diameter, to characterize these structures. A vibration model is developed in order to provide an analytical foundation for the identification of optimal parameters piv 1 and piv 2. It is verified by finite-element simulations and substantive experiments. The results allow to relate the device performance, including resonance frequency and output power, to piv 1 and piv 2. This shows that the output rises with increasing piv 2, and that the maximum output for a given piv 2 always lies in the range ${\varpi }_{1}\in (\mathrm{0.1,}\,0.2).$ Based on this observation, an improved harvester structure with a pre-stress of 0.3 N is identified, that exhibits a matched power up to 16.3 mW at 219 Hz. This demonstrates the feasibility to achieve VPEHs with higher outputs and lower eigenfrequency through simultaneous modification of piv 1 and piv 2, which is highly beneficial for low-frequency energy harvesting. Smart Materials and Structures 26 4 IOP Science 11 Department of Materials and Earth Sciences > Material Science11 Department of Materials and Earth Sciences > Material Science > Mechanics of functional Materials11 Department of Materials and Earth Sciences 20 Feb 2017 13:14 doi:10.1088/1361-665X/aa5fda Dublin CoreASCII CitationSimple MetadataBibTeXHTML CitationJSONMODSEP3 XMLAtomT2T_XMLReference ManagerRDF+XMLMultiline CSVEndNote TUfind oder in Google
 Send an inquiry

Options (only for editors)
 Show editorial Details