Development of a Low-Frequency High Purity A0 Mode Transducer for SHM Applications

被引：20

作者：

Clarke, Thomas ^{[1
]}

Simonetti, Francesco ^{[1
]}

Rohklin, Stanislav ^{[2
]}

Cawley, Peter ^{[1
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, UK Res Ctr NDE, London, England

[2] Ohio State Univ, Coll Engn, Columbus, OH 43210 USA

来源：

IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL | 2009年 / 56卷 / 07期

基金：

英国工程与自然科学研究理事会;

关键词：

TIME-REVERSAL; HEALTH; WAVES; DAMAGE; ARRAY;

D O I：

10.1109/TUFFC.2009.1201

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

The reliability of structural health monitoring (SHM) systems based on guided ultrasonic waves is improved if pure modes are generated by the transducers. A piezoelectric-based transducer generating high purity All mode guided waves at low frequencies (around 20 kHz) was developed. The through-thickness resonance of a piezoelectric element was lowered to the frequency region of interest by use of backing masses and low-stiffness front layers. Soft front layers also reduced significantly the transmission of in-plane displacements caused by Poisson's ratio effects in the piezoelectric element to the structure. Parametric studies were undertaken by varying the backing mass length, the transducer diameter, and the thickness of the front layer. The thickness of the plates on which the transducers were operated was found to be a critical issue and these effects were evaluated. Results obtained by finite-element analysis were validated by experimental measurements and showed that signals with A(0)/S-0 energy ratios substantially above 40 dB can be obtained.

引用

页码：1457 / 1468

页数：12

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