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柔性无损检测超声线阵换能器的仿真研究
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Abstract:
为了突破传统刚性超声探头无法完全贴合零部件曲面的限制，论文设计了一种由压电材料PZT-5H和聚二甲基硅氧烷(PDMS)组成的柔性超声线阵换能器。针对设计的柔性换能器采用有限元分析方法对其电阻抗性能、脉冲回波特性进行了仿真分析，获得了换能器的中心频率，？6 dB带宽以及发射电压响应。此外分别仿真了此柔性换能器应用于凹面和凸面金属管时对其内部裂纹的检测情况。仿真结果显示换能器的中心频率为21.5 MHz，？6 dB带宽为51.2%。换能器为凹形和凸形时其声压级均满足检测需求，可以用于对钢管中裂隙进行检测。
In order to overcome the limitation that traditional rigid probes cannot fully adhere to curved surfaces, a flexible ultrasonic linear array transducer composed of piezoelectric material PZT-5H and polydimethylsiloxane (PDMS) was designed. Simulate and analyze the impedance performance and pulse echo characteristics of the designed flexible transducer using the finite element software COMSOL, and obtain the center frequency, ？6 dB bandwidth, emission voltage response. Then, the detection of cracks in metal pipes using this flexible transducer on concave and convex surfaces was simulated separately. The simulation results show that the center frequency of the transducer is 21.5 MHz, with a ？6 dB bandwidth of 51.2%. When the transducer is concave or convex, its sound pressure level meets the detection requirements and can be used to detect cracks in steel pipes.
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