中文摘要：

对一种圆管形径向复合压电陶瓷超声换能器径向振动特性进行研究.该换能器由径向极化薄壁压电陶瓷短圆管与薄壁金属短圆管径向复合而成.基于弹性力学理论和机电类比原理,建立了换能器径向振动机电类比等效电路,并推导出其径向共振频率、反共振频率方程及有效机电耦合系数的解析式.实验加工了一些径向复合换能器样品,并对其径向共振频率及有效机电耦合系数进行了测试.结果表明,理论与实验测试结果相吻合.

英文摘要：

The radial vibration of a radial composite round tube piezoelectric ultrasonic transducer was studied.The transducer consists of an inner radially polarized short piezoelectric ceramic round tube and an outer short thin-walled metal prestressed tubular shell which are compounded in the radial direction.Based on the elastic dynamics theory and the electro-mechanical analogy,the equivalent circuit of the radial composite piezoelectric transducer is derived.The analysis formulae of the resonance frequency and the anti-resonance frequency equation as well as the effective electro-mechanical couple coefficient of the transducer are obtained.By testing the radial resonance frequencies and the effective electro-mechanical couple coefficients of some trial-made transducers,it is shown that the theoretical radial resonance frequencies of the transducers from the frequency equation in this paper are in a good agreement with the measured results.