Pourashraf Talieh, Bonello Philip, Truong Jason
Department of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester M13 9PL, UK.
Sensors (Basel). 2022 Mar 12;22(6):2207. doi: 10.3390/s22062207.
Piezoelectric energy harvesters have traditionally taken the form of base excited cantilevers. However, there is a growing body of research into the use of curved piezoelectric transducers for energy harvesting. The novel contribution of this paper is an analytical model of a piezoelectric energy harvesting curved beam based on the dynamic stiffness method (DSM) and its application to predict the measured output of a novel design of energy harvester that uses commercial curved transducers (THUNDER TH-7R). The DSM predictions are also verified against results from commercial finite element (FE) software. The validated results illustrate the resonance shift and shunt damping arising from the electrical effect. The magnitude, phase, Nyquist plots, and resonance frequency shift estimates from DSM and FE are all in satisfactory agreement. However, DSM has the advantage of having significantly fewer elements and is sufficiently accurate for commercial curved transducers used in applications where beam-like vibration is the predominant mode of vibration.
传统上，压电能量采集器采用基础激励悬臂梁的形式。然而，对于将弯曲压电换能器用于能量采集的研究正在不断增加。本文的新颖贡献在于基于动态刚度法（DSM）建立了一个压电能量采集弯曲梁的分析模型，并将其应用于预测一种采用商用弯曲换能器（雷声公司TH-7R）的新型能量采集器的测量输出。DSM的预测结果也与商用有限元（FE）软件的结果进行了验证。验证结果表明了电效应引起的共振频率偏移和并联阻尼。DSM和FE的幅值、相位、奈奎斯特图以及共振频率偏移估计值都吻合得很好。然而，DSM的优势在于其单元数量显著更少，并且对于在以梁式振动为主要振动模式的应用中所使用的商用弯曲换能器而言，其精度足够高。
