Journal
SMART MATERIALS AND STRUCTURES
Volume 27, Issue 6, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-665X/aabe9e
Keywords
energy harvesting; electromechanical coupling; iteration numerical method; piezoelectric
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Research Manitoba
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This paper presents an iterative numerical method that accurately models an energy harvesting system charging a capacitor with piezoelectric patches. The constitutive relations of piezoelectric materials connected with an external charging circuit with a diode bridge and capacitors lead to the electromechanical coupling effect and the difficulty of deriving accurate transient mechanical response, as well as the charging progress. The proposed model is built upon the Euler-Bernoulli beam theory and takes into account the electromechanical coupling effects as well as the dynamic process of charging an external storage capacitor. The model is validated through experimental tests on a cantilever beam coated with piezoelectric patches. Several parametric studies are performed and the functionality of the model is verified. The efficiency of power harvesting system can be predicted and tuned considering variations in different design parameters. Such a model can be utilized to design robust and optimal energy harvesting system.
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