基于频谱分析的压缩空气泄漏直射和反射超声的识别

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (8) : 58-62.

论文

基于频谱分析的压缩空气泄漏直射和反射超声的识别

廖平平，蔡茂林，许启跃，石岩

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The distinguishing between directed and reflected ultrasonic signal generated by compressed air leak source based on spectrum analysis

LIAO Pingping CAI Maolin XU Qiyue SHI Yan

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文章历史 +

摘要

介绍了气动系统中压缩空气泄漏超声检测的原理，分析了由反射超声信号导致的错误检测问题，并提出通过识别反射超声信号的方法来解决此问题；对直射和反射超声信号进行测量实验研究，发现并分析了直射和反射超声信号在频谱图形状上存在的明显区别；通过设计识别算法，得到可识别反射超声信号的反射特征系数 (Reflectance Characteristic Coefficient，RCC)；经实例计算发现：直射超声信号的RCC值在100以下，反射超声信号的RCC值在200以上。该结果对压缩空气泄漏检测中有效的识别出反射超声信号、避免由反射超声波导致的检测错误具有重要的实用价值。

Abstract

The principle of compressed air leak ultrasonic detection in pneumatic system was introduced. The detection error caused by reflected ultrasonic was analyzed and a method which solved this problem by distinguishing reflected ultrasonic was proposed. Compressed air leak directed and reflected ultrasonic signal was studied through measurement experiment. We analyzed the obvious differences between the spectrums of directed and reflected ultrasonic signal. An algorithm for distinguishing reflected ultrasonic were designed through which the Reflectance Characteristic Coefficient RCC was calculated. From the case study, we find that the RCC value of directed ultrasonic signal is below 100 while that of reflected ultrasonic signal is above 200. The result has significant practical value for distinguishing reflected ultrasonic and avoiding error detection caused by reflected ultrasonic in ultrasonic leak detection.

导出引用

廖平平;蔡茂林;许启跃;石岩. 基于频谱分析的压缩空气泄漏直射和反射超声的识别[J]. 振动与冲击, 2013, 32(8): 58-62

LIAO Pingping CAI Maolin XU Qiyue SHI Yan. The distinguishing between directed and reflected ultrasonic signal generated by compressed air leak source based on spectrum analysis[J]. Journal of Vibration and Shock, 2013, 32(8): 58-62