Design Scalability Study of the Γ-Shaped Piezoelectric Harvester Based on Generalized Classical Ritz Method and Optimization

Electronics

Honghee Yoo¹  Sinwoo Jeong¹  Soobum Lee² 

[1] Department of Mechanical Engineering, Hanyang University, 222 Wangshimni-ro, Seongdong-gu, Seoul 04763, Korea;Department of Mechanical Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA;

关键词: piezoelectric energy harvester;    generalized classical Ritz method;    shape optimization;    differential evolution;    normalized power density;    design scalability;   

DOI  :  10.3390/electronics10161887

来源: DOAJ

【 摘 要 】

This paper studies the design scalability of a $\mathsf{\Gamma }$-shaped piezoelectric energy harvester ($\mathsf{\Gamma }$EH) using the generalized classical Ritz method (GCRM) and differential evolution algorithm. The generalized classical Ritz method (GCRM) is the advanced version of the classical Ritz method (CRM) that can handle a multibody system by assembling its equations of motion interconnected by the constraint equations. In this study, the GCRM is extended for analysis of the piezoelectric energy harvesters with material and/or orientation discontinuity between members. The electromechanical equations of motion are derived for the PE harvester using GCRM, and the accuracy of the numerical simulation is experimentally validated by comparing frequency response functions for voltage and power output. Then the GCRM is used in the power maximization design study that considers four different total masses—15 g, 30 g, 45 g, 60 g—to understand design scalability. The optimized $\mathsf{\Gamma }$EH has the maximum normalized power density of 23.1 × 10³ kg·s·m⁻³ which is the highest among the reviewed PE harvesters. We discuss how the design parameters need to be determined at different harvester scales.

【 授权许可】

Unknown