【作者】 王晓宇； 林书玉；

【Author】 WANG Xiaoyu;LIN Shuyu;Institute of Applied Acoustics, Shaanxi Normal University,Shaanxi Key Laboratory of Ultrasound;

【机构】 陕西师范大学应用声学研究所陕西省超声学重点实验室；

【摘要】 研究了损耗及负载对径向复合管型换能器振动特性的影响。径向复合管型换能器由一个径向极化的压电陶瓷圆管和一个外金属圆管构成。在原有理论的基础上,得到了径向复合管型换能器的机电等效电路,进而得到了共振/反共振频率方程及有效机电耦合系数和机械品质因数的表达式。研究表明:损耗阻抗和负载机械电阻对换能器输入电阻抗的模值的影响比较明显。负载机械电阻对换能器的共振/反共振频率和有效机电耦合系数的影响不大。随着负载机械电阻的增大,换能器的机械品质因数逐渐减小。更多还原

【Abstract】 The effects of loss and load on the vibration characteristics of radial composite tube transducers are studied. The radial composite tubular transducer is composed of a radially polarized piezoelectric ceramic round tube and an outer metal round tube. Based on the original theory, the electromechanical equivalent circuit of the radial composite tube transducer is obtained, and then the resonance/anti-resonance frequency equation and the expressions of effective electromechanical coupling coefficient and mechanical quality factor are obtained. The study shows that the effects of loss impedance and load mechanical resistance on the input impedance modulus of the transducer are obvious. The load mechanical resistance has little effect on the resonance frequency/anti-resonance frequency of the transducer and the effective electromechanical coupling coefficient. As the load mechanical resistance increases, the mechanical quality factor of the transducer gradually decreases.更多还原