Simulation of Scattering Acoustic Field in Rod and Identification of Ultrasonic Flaw Detecting Signal
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摘要: 棒材是一种应用很广泛的型材, 因此棒材的无损检测十分重要。提出一种脉冲超声场模拟的方法, 模拟了玻璃棒中的超声波散射声场。通过与动态光弾实验结果比较, 解释了圆棒的超声检测中散射波(如瑞利波)的形成机理。在此基础上, 用单换能器采集圆棒中的连续回波信号并对信号做相关处理, 仅需测量一次棒材的回波信号就可以计算其力学性能结果。该方法对棒材探伤和力学性能评价等方面有很大用途。Abstract: Bar is in very broad application, therefore non-destructive testing has been more attention. A method of pulse ultrasonic wave field simulating was proposed, which simulated scattering acoustic field in a glass rod, results were compared with dynamic photoelastic experiments, explained the forming mechanism of the scattering wave(e.g., the side wall wave) in ultrasonic flaw detection of rod was explained. Based on this, the serial echo signal in the flaw detection of rod using single transducer was identified, and a signal processing algorithm was suggested. According to these, using single transducer, only testing one time, many mechanical performance measurements could be completed, and it is useful for flaw detection and evaluation of the mechanical properties.
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Keywords:
- Simulation /
- Pulse ultrasonic /
- Scattering acoustic field /
- Flaw detection
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[1] 原可义.超声散射CT声成像方法研究[D].北京: 清华大学, 2008.
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