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A Novelly Universal Theory: Toward Accurately Evaluating Radial Vibration Characteristics for Radially Sandwiched Spherical Piezoelectric Transducer
Ultrasonics ( IF 4.2 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.ultras.2020.106299
Sha Wang , Shuyu Lin

With the development of ultrasonic technology, some ultrasonic processing technologies require a wide processing range. In this paper, a radially sandwiched spherical piezoelectric transducer is proposed and analyzed, which is composed of a spherical piezoelectric ceramic sandwiched by two concentric spherical metal shells. The electromechanical equivalent circuits of the spherically isotropic spherical shell and the spherical piezoelectric ceramic with arbitrary wall thickness are derived from their motion equations. According to the mechanical boundary conditions, the electromechanical equivalent circuits and frequency equation of various piezoelectric composite vibration systems can be obtained, including the radially sandwiched spherical piezoelectric transducer. The correctness of the proposed theory is verified via comparison with the finite element method and the previous theoretical model. In addition, the 2nd-order effective mechanical coupling coefficient for the radially sandwiched spherical piezoelectric transducer is higher than that of 1st-order within a specific range of wall thickness, which can be designed as the high-frequency transducer. The radially sandwiched spherical piezoelectric transducer is expected to be used in underwater sound, structural health monitoring, and high-frequency ultrasound.

中文翻译:

一个新奇的通用理论:精确评估径向夹心球形压电换能器的径向振动特性

随着超声波技术的发展,一些超声波加工技术要求的加工范围很广。在本文中,提出并分析了一种径向夹心球形压电换能器,它由两个同心球形金属壳夹着一个球形压电陶瓷组成。由球面各向同性球壳和任意壁厚球形压电陶瓷的运动方程推导出机电等效电路。根据机械边界条件,可以得到各种压电复合振动系统的机电等效电路和频率方程,包括径向夹心球形压电换能器。通过与有限元方法和已有理论模型的对比,验证了所提理论的正确性。此外,径向夹心球形压电换能器的二阶有效机械耦合系数在特定壁厚范围内高于一阶,可设计为高频换能器。径向夹心球形压电换能器有望用于水下声音、结构健康监测和高频超声领域。可设计为高频换能器。径向夹心球形压电换能器有望用于水下声音、结构健康监测和高频超声领域。可设计为高频换能器。径向夹心球形压电换能器有望用于水下声音、结构健康监测和高频超声领域。
更新日期:2021-03-01
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