Behavior of piezoelectric ultrasonic tubular transducers in relation to tube geometry

• Published in: Journal of electroceramics 2006-07, Vol.16 (4), p.307-311
• Main Authors: NG, N. K. C, LI, T, MA, J, BOEY, F. Y. C
• Format: Article
• Language: English
• Subjects: Acoustic wave devices, piezoelectric and piezoresistive devices; Applied sciences; Computer science; control theory; systems; Control theory. Systems; Electronics; Exact sciences and technology; Geometry; Materials; Robotics; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Studies
• ISSN: 1385-3449; 1573-8663
• DOI: 10.1007/s10832-006-9870-8

Issue Title: Special Issue: Symposium on Functional Ceramic Materials and Thin Films of ICMAT 2005: Part I July 2006 The piezoelectric ultrasonic actuator, a recent development in the field of ferroelectrics, has led to applications in a wide range of industries. These actuators have proven to outperform their electromagnetic counterparts of mm-order diameters and below, and the demand for such devices in high power applications continues to increase. The performance of such motors, in particular, those of tubular form, are governed by two key material properties, the mechanical quality factor, Q ^sub m^ and the piezoelectric constant, d ^sub 31^. This paper presents experimental results showing that the factor, Q ^sub m^× d ^sub 31^, indeed governs the performance of such motors. In the present work, tubes of various materials and geometries are characterized in terms of resonance frequency, the dynamic bending displacement, and the vibration velocity. A comparison is made showing a possible dependence of material constants, Q ^sub m^ and d ^sub 31^ on the geometry of the tube, as well as the input electric field. The derivation of the constitutive relationships has been carried out and compared to the experimental results. The geometric dependence of material property data indicates the need for a possible relationship linking these properties to the geometry. The second part of the work presents experimental data verifying the relationship between the material properties Q ^sub m^ and d ^sub 31^, with the geometry of the material and the input electric field.[PUBLICATION ABSTRACT]