Analytical study of influence of boundary conditions on acoustic power transfer through an elastic barrier. (20th December 2018)

• Record Type: Journal Article
• Authors: Wang, Xianfeng; Shi, Zhifei; Song, Gangbing
• Is Part Of: Smart materials and structures. Volume 28:Number 2(2019:Feb.)
• Publication Date: 2018-12-20
• Subjects: wireless power transfer -- acoustic power transfer -- piezoelectric transducer -- ultrasonic -- boundary conditions; Smart materials -- Periodicals; Strucural design -- Periodicals; 620.11
• DOI: 10.1088/1361-665X/aaeb73
• Languages: English
• ISSNs: 0964-1726

Abstract

Abstract: In this paper, a fully coupled electromechanical model of wireless power transfer through an elastic barrier using piezoelectric transducers is established based on the theory of piezoelectricity. In this model, an elastic layer representing the elastic barrier is sandwiched by two piezoelectric layers attached by boundary mass and boundary constraint. The two piezoelectric layers act as input energy converter and output energy receiver, respectively. Using the electrical and mechanical boundary and continuous conditions, all the electrical and mechanical components of the system are derived. A simplification is performed and compared with a previous study and a preliminary experiment to valid the present study. Numerical studies are conducted to reveal the effects of circuit load resistance, barrier thickness, boundary mass and boundary constraint on the resonance frequency, output voltage, output power and transmission efficiency of the present model. With different circuit load resistance, the system resonance frequency is found between the short-circuit resonance frequency and open-circuit resonance frequency. With boundary mass applied to the piezoelectric transducers, the maximum resonance frequency response of both the output power and the transmission efficiency move toward the low-order resonance frequency. With boundary constraint applied to the boundary mass, a newly generated resonance frequency with high transmission efficiency at the low-frequency range is observed. A method to recognize the necessary input frequency range as well as the necessary circuit load resistance range respectively for large output power and large transmission efficiency is proposed.