Theoretical analysis and experimental validation of radial cascaded composite ultrasonic transducer

doi:10.1088/1674-1056/abd399

Abstract A radial cascaded composite ultrasonic transducer is analyzed. The transducer consists of three short metal tubes and two radially polarized piezoelectric ceramic short tubes arranged alternately along the radial direction. The short metal tubes and the piezoelectric ceramic short tubes are connected in parallel electrically and in series mechanically, which can multiply the input sound power and sound intensity. Based on the theory of plane stress, the electro-mechanical equivalent circuit of radial vibration of the transducer is derived firstly. The resonance/anti-resonance frequency equation and the expression of the effective electromechanical coupling coefficient are obtained. Excellent electromechanical characteristics are determined by changing the radial geometric dimensions. Two prototypes of the transducers are designed and manufactured to support the analytical theory. It is concluded that the theoretical resonance/anti-resonance frequencies are consistent with the numerical and experimental results. When R₂ is at certain values, both the anti-resonance frequency and effective electromechanical coupling coefficient corresponding to the second mode have maximal values. The radial cascaded composite ultrasonic transducer is expected to be used in the fields of ultrasonic water treatment and underwater acoustics.

Keywords: radial cascaded transducer radial vibration equivalent circuit effective electromechanical coupling coefficient

Received: 14 October 2020
Revised: 09 November 2020
Accepted manuscript online: 15 December 2020

PACS:	07.07.Mp	(Transducers)
	07.05.Tp	(Computer modeling and simulation)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11674206 and 11874253).

Corresponding Authors: ^†Corresponding author. E-mail: hjwlx@snnu.edu.cn ^‡Corresponding author. E-mail: sylin@snnu.edu.cn

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Xiao-Yu Wang(王晓宇), Zhi-Xin Yu(余芷欣), Jing Hu(胡静), and Shu-Yu Lin(林书玉) Theoretical analysis and experimental validation of radial cascaded composite ultrasonic transducer 2021 Chin. Phys. B 30 040701

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