当前位置: X-MOL 学术Mech. Syst. Signal Process. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
A comb-like beam based piezoelectric system for galloping energy harvesting
Mechanical Systems and Signal Processing ( IF 8.4 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.ymssp.2020.107301
Guobiao Hu , Junlei Wang , Lihua Tang

Abstract This paper proposes a comb-like beam (CombBeam) based piezoelectric energy harvester (PEH) for harvesting wind energy by exploiting the galloping mechanism. The CombBeam-based PEH consists of a series of parasitic beams being mounted to a conventional cantilever beam with a piezoelectric transducer. A theoretical modelling method is established to simplify the proposed CombBeam-based PEH as a multiple-degree-of-freedom (MDOF) system. The conventional beam PEH is first represented as a single-degree-of-freedom (SDOF) system and the parasitic beam is then also converted into an equivalent SDOF system. A factor is derived to correct the reaction force of the SDOF model of the parasitic beam to address the force interaction between the host beam and the parasitic beam and a scaling factor is introduced to reflect the effect of the parasitic beam when being mounted onto the host beam at different positions. The complete mathematical formulations of the MDOF model for the CombBeam-based PEH under the base excitation and the aerodynamic force excitation are developed. Under the base excitation, a finite element model is built to first verify the MDOF model of the proposed CombBeam-based PEH in terms of derived equivalent lumped parameters, correction factors and scaling factor. A physical prototype of the proposed CombBeam PEH is then fabricated and the wind tunnel experiment is conducted to validate the MDOF model for predicting the energy harvesting performance under aerodynamic force excitation. The PEH undergoing galloping is referred as CombBeam-based GPEH to distinguish it with that under the base excitation. The results show that the CombBeam-based GPEH has the advantages over a conventional beam GPEH in reducing the cut-in wind speed from 2.24 m/s to 1.96 m/s and enhancing the power output around the optimal resistance for about 171.2% under a specific wind speed of 3 m/s.

中文翻译:

一种基于梳状梁的飞驰能量采集压电系统

摘要 本文提出了一种基于梳状梁(CombBeam)的压电能量采集器(PEH),利用飞驰机制采集风能。基于 CombBeam 的 PEH 由一系列寄生梁组成,这些寄生梁安装在带有压电换能器的传统悬臂梁上。建立了一种理论建模方法,以将所提出的基于梳状束的 PEH 简化为多自由度 (MDOF) 系统。传统光束 PEH 首先表示为单自由度 (SDOF) 系统,然后寄生光束也转换为等效的 SDOF 系统。推导了修正寄生梁单自由度模型反作用力的因子,以解决主梁与寄生梁之间的力相互作用问题,并引入比例因子来反映寄生梁安装到主机上时的影响光束在不同的位置。在基础激励和气动力激励下,开发了基于梳状梁的 PEH 的 MDOF 模型的完整数学公式。在基础激励下,建立有限元模型,首先从导出的等效集总参数、校正因子和比例因子方面验证所提出的基于梳状束的 PEH 的 MDOF 模型。然后制造所提出的 CombBeam PEH 的物理原型,并进行风洞实验以验证 MDOF 模型,用于预测空气动力激励下的能量收集性能。飞驰的PEH被称为基于梳状束的GPEH,以区别于基础激发下的GPEH。结果表明,基于 CombBeam 的 GPEH 在将切入风速从 2.24 m/s 降低到 1.96 m/s 以及在最佳阻力附近将功率输出提高约 171.2% 方面优于传统梁式 GPEH。比风速 3 m/s。
更新日期:2021-03-01
down
wechat
bug