基于电磁耦合的压电式超声换能器仿真研究  

Simulation Study on Piezoelectric Ultrasonic Transducer Based on Electromagnetic Coupling

作　　者：唐思雄 郭新华 TANG Sixiong;GUO Xinhua(School of Mechanical and Electronic Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学机电工程学院,湖北武汉430070

出　　处：《数字制造科学》2024年第4期319-324,共6页

摘　　要：为进一步提高压电换能器声辐射性能,提出将电磁线圈引入至换能器设计过程,进行新型PVDF压电超声换能器结构设计,并利用有限元仿真研究线圈电磁耦合对换能器声辐射性能的影响,最后进一步揭示换能器声辐射性能和线圈参数的关系。仿真结果表明,施加电磁线圈激励后,压电薄膜振幅提高约3倍,换能器声压级由58.2 dB提高至66 dB,发射电压响应级由51 dB提高至54.2 dB,换能器-3 dB相对带宽由19%提升至28%。综上,线圈电磁耦合对于压电换能器发射声压级、发射电压响应等声辐射性能均有不同程度提升和优化。Piezoelectric ultrasonic transducers are widely favored over capacitive ultrasonic transducers due to their simple structure,ease of excitation,and convenient molding and processing,making it highly significant to further enhance their acoustic radiation performance.This study introduces an innovative design incorporating electromagnetic coils into the transducer’s structure,focusing on a new PVDF piezoelectric ultrasonic transducer.Finite element simulations are employed to analyze the influence of electromagnetic coupling on the transducer’s acoustic radiation performance and to reveal the relationship between coil parameters and performance characteristics.Simulation results demonstrate that introducing electromagnetic coil excitation enhances the piezoelectric film’s vibration amplitude by approximately threefold,increases the sound pressure level(SPL)from 58.2 dB to 66 dB,and raises the transmission voltage response from 51 dB to 54.2 dB.Additionally,the relative-3 dB bandwidth expands from 19%to 28%.These findings confirm that electromagnetic coupling significantly improves key acoustic radiation performance metrics,including emission SPL,voltage response,and bandwidth,offering a promising optimization approach for piezoelectric ultrasonic transducers.

关 键 词：电磁耦合 压电超声换能器 声压级 

分 类 号：TB552[理学—物理]