Research on High-Frequency Wideband Composite Piezoelectric Transducer for Non-Destructive Testing in High-Voltage Power Equipment

• Main Authors: Zhang, Fangyuan, Tian, Yi, Dang, Linpei, Miao, Qingqing, Niu, Haotian, Huang, Xinbo
• Format: Conference Proceeding
• Language: English
• Subjects: Acoustics; Adaptation models; broadband; Broadband communication; composite materials; Finite element analysis; High frequency; High-voltage techniques; Piezoelectric effect; Piezoelectric transducers; Radiation effects; Sound radiation; Testing; Wideband
• ISSN: 2644-271X
• DOI: 10.23919/CMD62064.2024.10766168

At present, although piezoelectric transducers have enormous potential for energy conversion, in practical non-destructive testing applications of high-voltage power equipment, most transducers cannot be embedded into various complex structures due to their large size, which affects the detection effect. Meanwhile, most existing high-frequency broadband transducers adopt array structures, which have high manufacturing and maintenance costs, which restrict their long-term and reliability applications. In view of this, this study aims to design a new small-sized high-frequency broadband composite piezoelectric transducer for these problems, calculate its optimal operating frequency, and adapt to the application scenarios of detecting small defects. A simulation model of composite piezoelectric transducers was constructed using finite element analysis. After considering the piezoelectric effect, composite material structure, and material parameters in detail in the physical model, the acoustic radiation characteristics of the transducer were calculated. By observing the sound radiation effect and extracting a sound directional map at the x-y plane sound pressure level, ensure that the sound radiation effect is uniform. On the basis of analyzing the influence of element size on acoustic radiation characteristics, the emission voltage response of piezoelectric transducers at different frequencies was simulated, and their performance was comprehensively evaluated. The research results indicate that the designed small-sized transducer with a simple structure has a maximum emission voltage response of 133dB at a frequency of 78kHz, exhibiting high-frequency and broadband characteristics. This design provides important theoretical reference and practical guidance for the optimization and practical application of future small-sized composite piezoelectric transducers.