Radial Vibration of a Regular Polygon Composite Piezoelectric Ultrasonic Transducer

Li, Luhua; Liu, Shiqing; Li, Dan

doi:10.3901/jme.2016.16.022

Cited by 3 publications

(2 citation statements)

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“…They mainly focused on three polarization modes, including axial, radial, and tangential polarization. However, the transducers based on the single phase piezoelectric elements usually have limitations like lower power capacity, smaller electromechanical coupling coefficients, the fixed prescribed vibration characteristics, and lower resolution level (Li et al, 2016; Zhou et al, 2011), which limit their extensive applications. To improve the transducer performance, researchers have tried different strategies.…”

Section: Introductionmentioning

confidence: 99%

Experimental validation of axially polarized multilayer piezoelectric composite cylindrical transducers with adjustable multifrequency

Qin

Wang

et al. 2021

Journal of Intelligent Material Systems and Structures

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The axially polarized multilayer piezoelectric composite cylindrical transducers with adjustable multifrequency capability have been proposed by adjusting the external electric resistance and the ratio of piezoelectric layer numbers between the actuator part and the sensor part, which have promising potential in designing the novel cymbal transducer for underwater sound projector and ultrasonic radiator applications. In the previous studies, the multilayer models were established to guide the design of the transducers with arbitrary layer number, and analyzed the dynamic characteristics theoretically. In this work, an experimental study is performed to validate the theoretical models and predictions. Piezoelectric rings with multiple concentric annular electrodes are designed to characterize the multilayer piezoelectric composite cylindrical transducers. The top surface of the piezoelectric rings is divided into two separate parts. One part is covered by multiple concentric annular electrodes, corresponding to the piezoelectric layers, and the other part is uncovered, corresponding to the elastic layers. Four prototypes are fabricated and each consists of four concentric annular electrodes. The impedance spectra are measured by the impedance analyzer to obtain the resonance and anti-resonance frequencies. Effects of two adjusting methods on the dynamic characteristics are evaluated experimentally. The experimental results basically coincide with the theoretical ones. This comprehensive experimental work assures the feasibility of using axially polarized multilayer piezoelectric composite cylindrical transducers with adjustable multifrequencies and confirms the benefit of the developed theoretical models for guiding the fabrication and optimization of this type of transducers.

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Section: Introductionmentioning

confidence: 99%

Experimental validation of axially polarized multilayer piezoelectric composite cylindrical transducers with adjustable multifrequency

Qin

Wang

et al. 2021

Journal of Intelligent Material Systems and Structures

View full text Add to dashboard Cite

show abstract

“…For a transducer whose length is much larger than its radial dimension, reference [13] regarded it as the plane strain problem in mechanics approximately, its pure radial vibration is analyzed, and its equivalent circuit and frequency equation are obtained. According to the principle of electromechanical analogy, reference [14] studied a kind of composite piezoelectricity ultrasonic transducer and obtained the equivalent circuit and frequency equation of the system. Reference [15] proposed a tangential polarized composite cylindrical transducer, which is connected by a tangential polarized piezoelectric tube and an outer metal circular tube, and its natural frequency is analyzed.…”

Section: Introductionmentioning

confidence: 99%

Radial Vibration Characteristics of Piezoelectric Ceramic Composite Ultrasonic Transducer

Yao

Zhang

et al. 2020

Shock and Vibration

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Different from the existing equivalent circuit analysis method of the transducer, based on the vibration theory of the mechanical system and combined with the constitutive equation, this paper analyzes the radial vibration characteristics of the transducer. The piezoelectric ceramic composite ultrasonic transducer is simplified as a mechanical model of a composite thick wall tube composed of a piezoelectric ceramic tube and a metal prestressed tube. The mathematical model of radial vibration of the transducer is established, which consists of the wave equation of radial coupling vibration of the piezoelectric ceramic tube and the metal prestressed tube, the continuity conditions, and the boundary conditions of radial vibration of composite thick wall tube. The characteristic equation and the mode function of radial vibration are derived. The calculated results of natural frequency are in good agreement with the existing experimental results. Based on the analytical method and the difference method, the numerical simulation models of radial vibration are established, and the amplitude-frequency characteristic curves and the displacement responses are given. The simulation results show that the amplitude-frequency characteristic curves and the displacement responses of the two methods are the same, which verifies the correctness of simulation results. Through the simulation analysis, the influence rule of the transducer’s structure sizes on its radial vibration natural frequency is given: when the thickness of the metal prestressed tube and the piezoelectric ceramic tube are constant, the natural frequency decreases with the increase of the inner diameter of the piezoelectric ceramic tube; when the outer diameter of the metal prestressed tube and the inner diameter of the piezoelectric ceramic tube are constant, the natural frequency decreases with the increase of the thickness-to-wall ratio. The calculation method of natural frequency based on elastic vibration theory is clear in concept and simple in calculation, and the simulation models can analyze the mechanical vibration of the transducer.

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Open-slit circular tube piezoelectric ultrasonic transducer with longitudinal bending mode conversion

LI,

LIU,

et al. 2023

Sci. Sin.-Phys. Mech. Astron.

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Radial Vibration of a Regular Polygon Composite Piezoelectric Ultrasonic Transducer

Cited by 3 publications

References 0 publications

Experimental validation of axially polarized multilayer piezoelectric composite cylindrical transducers with adjustable multifrequency

Experimental validation of axially polarized multilayer piezoelectric composite cylindrical transducers with adjustable multifrequency

Radial Vibration Characteristics of Piezoelectric Ceramic Composite Ultrasonic Transducer

Open-slit circular tube piezoelectric ultrasonic transducer with longitudinal bending mode conversion

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