期刊
SMART MATERIALS AND STRUCTURES
卷 24, 期 5, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0964-1726/24/5/055005
关键词
energy harvesting; piezoelectric materials; shear mode; Timoshenko beam
资金
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1333818] Funding Source: National Science Foundation
Piezoelectric materials are excellent candidates for use in energy harvesting applications due to their high electromechanical coupling properties that enable them to convert input mechanical energy into useful electric power. The electromechanical coupling coefficient of the piezoelectric material is one of the most significant parameters affecting energy conversion and is dependent on the piezoelectric mode of operation. In most piezoceramics, the d(15) piezoelectric shear coefficient is the highest coefficient compared to the commonly used axial and transverse modes that utilize the d(33) and the d(31) piezoelectric strain coefficients. However, complicated electroding methods and challenges in evaluating the performance of energy harvesting devices operating in the shear mode have slowed research in this area. The shear deformation of a piezoelectric layer can be induced in a vibrating sandwich beam with a piezoelectric core. Here, a model based on Timoshenko beam theory is developed to predict the electric power output from a cantilever piezoelectric sandwich beam under base excitations. It is shown that the energy harvester operating in the shear mode is able to generate similar to 50% more power compared to the transverse mode for a numerical case study. Reduced models of both shear and transverse energy harvesters are obtained to determine the optimal load resistance in the system and perform an efficiency comparison between two models with fixed and adaptive resistances.
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