The band gap, localization, and waveguide characteristics of phononic crystal structures offer extensive potential for applications in the transducer field, particularly for circular-hole phononic crystals, which are extensively utilized in performance optimization research for transducers owing to their straightforward structure and ease of fabrication. Nonetheless, studies have revealed that the bandgap width of circular-hole phononic crystal structures is directly proportional to their porosity. Typically, a higher porosity leads to enhanced energy localization of elastic waves. However, high porosity implies a narrower distance between circular holes, drastically compromising the mechanical strength of the structure. The introduction of columnar phononic crystal structures addresses the issues of high porosity and stringent dimensional accuracy demands of circular-hole phononic crystal structures, presenting novel avenues for enhancing the performance of piezoelectric ultrasonic transducers.
The paper employs cylindrical and acoustic surface structures fabricated on the front and rear cover plates of piezoelectric ultrasonic transducers to manipulate the transmission behavior and pathway of sound waves, thereby achieving effective control over coupled vibrations within the transducer. This approach not only addresses the issue of uneven amplitude distribution on the radiation surface due to uneven vibration energy transmission but also markedly enhances the displacement amplitude of the transducer's radiation surface, ultimately boosting its operational efficiency. Simulation results elucidate the impact of the configuration of these cylindrical and acoustic surface structures on transducer performance. Experimental findings further validate that these structures can effectively elevate the performance of piezoelectric ultrasonic transducers. This research offers systematic design theoretical support for the engineering calculation and optimization of transducers.
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