斜楔块条件下超声换能器的声场仿真

发布时间：2018-04-14 21:09

  本文选题：空间脉冲响应 + 斜楔块　； 参考：《振动与冲击》2017年06期

【摘要】：各种大型轴类零件形状复杂,体积和质量大,拆卸困难,主要用小角度纵波探头在轴端面实施探伤。小角度纵波超声检测方法在工业中有着大量的应用,对于小角度纵波探头的声场研究还较少。以空间脉冲响应为理论基础,根据界面条件下的波形转换以及超声波的透射规律,建立了小角度纵波超声探头在斜楔块条件下的空间声压模型,给出了其空间脉冲响应的计算公式,并仿真得到了不同斜楔块角度时介质中的声压分布图,利用半圆阶梯试块测试了声轴线的声压和指向性图,实验结果和仿真计算基本一致。该方法可用于不同参数的超声探头倾斜入射时的声场仿真,为制定轴类零件非拆卸情况下的检测策略,提高检测可靠性奠定基础。
[Abstract]:All kinds of large shaft parts are complicated in shape, large in volume and mass, difficult to disassemble, and are mainly used to carry out flaw detection on the end surface of the shaft with small angle longitudinal wave probe.The small angle longitudinal wave ultrasonic detection method has a large number of applications in industry, and the research on the sound field of the small angle longitudinal wave probe is still less.Based on the theory of spatial pulse response, the spatial sound pressure model of a small angle longitudinal wave ultrasonic probe under wedge-wedge condition is established according to the waveform conversion and the ultrasonic transmission law under the interface condition.The calculation formula of the spatial impulse response is given, and the sound pressure distribution diagram in the medium with different wedge angles is obtained by simulation. The sound pressure and directivity diagram of the acoustic axis is tested by using the semi-circular step test block. The experimental results are in good agreement with the simulation calculation.This method can be used to simulate the sound field of ultrasonic probe with different parameters when it is tilted and incident, which lays a foundation for determining the detection strategy for shaft parts without disassembly and for improving the reliability of detection.
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本文编号：1751023