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大尺寸压电超声换能器的耦合振动会导致其辐射面纵向位移振幅的平均值较小，振幅分布不均匀，严重影响系统的性能和可靠性。为了改善大尺寸超声振动系统性能，研究者们利用二维孔/槽型近周期声子晶体结构对横向振动进行抑制，但在对横向振动抑制的同时，结构的存在却会对换能器机械强度、工作带宽等性能参数造成不利的影响。针对这一问题，本文提出利用管柱型近周期声子晶体点缺陷结构对大尺寸夹心式纵振压电陶瓷换能器进行优化的新思路。该方法不仅可以利用构造的固/气二维近周期声子晶体结构的点缺陷模式，获得极低的能量损耗，有效提高系统辐射面的纵向位移振幅和振幅分布均匀度；也可以利用管柱结构中的双环形孔增强声波的多重散射，使得换能器在管柱柱高较低的条件下也能产生禁带，有效抑制横向振动的同时，大幅拓宽换能器系统的工作带宽，增强系统的稳定性和机械强度，降低加工成本。仿真结果证明了优化的有效性。
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关键词:
- 横向振动 /
- 大尺寸压电超声换能器的性能 /
- 管柱型近周期声子晶体点缺陷结构
The coupling vibration of large-scale piezoelectric ultrasonic transducer will cause the average value of the longitudinal displacement amplitude of its radiation surface to be small, and the amplitude distribution is uneven, which seriously affects the performance and reliability of the system. In order to improve the performance of large-scale ultrasonic vibration system, researchers use two-dimensional hole/slot near-periodic phononic crystal structure to suppress the transverse vibration, but the structure will also affect the mechanical strength of the transducer while achieving the suppression of the transverse vibration The working bandwidth and other performance parameters have adverse effects. Based on this, a new idea of optimizing the large-scale sandwich longitudinal vibration piezoelectric ceramic transducer using the tubular near-periodic phononic crystal point defect structure is proposed. This method can not only use the point defect mode of the constructed solid/gas two-dimensional near-periodic phononic crystal structure to obtain extremely low energy loss, Effectively improve the longitudinal displacement amplitude and amplitude distribution uniformity of the radiation surface of the system; The double annular holes in the pipe string structure can also be used to enhance the multiple scattering of sound waves, so that the transducer can also produce a band gap under the low conditions of the pipe string, effectively suppress the transverse vibration, at the same time, significantly broaden the working bandwidth of the transducer system, enhance the stability and mechanical strength of the system, and reduce the processing cost. Simulation results and experimental processing test results also prove the effectiveness of the optimization.
In order to find the best parameters for the performance of the large-scale longitudinal vibration piezoelectric ultrasonic transducer, the paper uses the finite element analysis software to study the influence of the inner radius r1 of the pipe string, the width r of the pipe string ring, the radius R of the outermost air cylinder hole, and the height h2 of the pipe string on the longitudinal resonance frequency of the transducer performance, the longitudinal displacement amplitude distribution uniformity of the radiation surface, and the average longitudinal displacement amplitude. The research finally found the range of parameters that can make the performance of the transducer reach a relatively ideal state. The simulation results show that the tubular near-periodic phononic crystal point defect structure can improve the performance of large-scale longitudinal vibration piezoelectric ultrasonic transducer.-
Keywords:
- Transverse vibration /
- performance of large-scale piezoelectric ultrasonic transducer /
- tubular near-periodic phononic crystal point defect structure
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