Year: 1990
Type: dissertation
Abstract: Most of the techniques to analyse the vibration characteristics of piezoelectric discs are one dimensional, which assumes that the piezoelectric disc vibrates in the thickness direction only (piston-like motion) and is applicable to discs with either very large diameter to thickness ratio (D/T ratio) or very small D/T ratio.However, it cannot predict other modes of vibration of the piezoelectric disc, which may affect the transducer behaviour in the frequency range of interest, especially for those discs with finite D/T ratios.active element The acoustic impedance of the backing and face are chosen to control the signal produced.This entire assembly is then housed in a metal case as shown in Fig 1.1.Two electrodes on the top and bottom surfaces of the disc are connected to signal generators or signal receivers.Piezoelectric transducers may be used to operate in two modes as shown in Fig 1.2; one is transmission mode in which an ultrasonic wave is generated by an applied electrical Chapter 1 Curve I: the first radial mode obtained by generalised plane stress theory; Curve II: the first two radial modes by the first order plate theory; Dots: Shaw's experimental results obtained
Source: Spiral (Imperial College London)
Author: Ningqun Guo
Language: English
Subfield: Mechanics of Materials
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2528558794