期刊
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
卷 23, 期 7, 页码 3280-3302出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/1099636220926863
关键词
Energy harvester; nanosandwich beam; piezoelectric; piezomagnetic materials; porous properties; surface effect
类别
资金
- National Natural Science Foundation of China [11702070]
This paper proposes a nanoporous piezoelectric/piezomagnetic beam with a storage circuit as an energy harvester, and obtains governing equations and analytical solutions through numerical calculations. The research shows that by adjusting material and geometrical parameters, the resonant frequency interval can be controlled and the output electric power can be improved.
Piezoelectric/piezomagnetic energy harvester has attracted great interest, which can convert magnetic energy into electric power. However, the challenges are how to provide lasting electric energy to the nanoscale components and avoid the inherent brittleness of the piezoelectric and piezomagnetic materials. Therefore, a nanoporous piezoelectric/piezomagnetic beam with a storage circuit is proposed to be an energy harvester in this paper. The nanoporous beam is treated as a sandwich composite beam with the piezoelectric/piezomagentic core bulks and the surface or interface layers. Based on the surface effect theory and the Boit's porous elasticity, the governing equations and the analytical solutions of the nanoporous piezoelectric/piezomagnetic energy harvester with the flexural mode are obtained. The numerical calculation points out that the resonant frequency, output power density and the output voltage depend on the surface materials parameters, porosity properties, solid-fluid coupling effects, the geometrical dimensions, as well as the piezoelectric/piezomagnetic materials composition of the structure. The results reveal that the resonant frequency interval can be controlled and the output electric power can be improved by adjusting the materials and geometrical parameters.
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