Dispersion Calculation and Defect Detection of Guided Waves in Pipes
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摘要: 航空结构中不易拆卸的小口径管路和石油输油管道都需要一种高效快捷的损伤检测手段，研究了基于压电传感器的导波技术对中小口径管结构损伤的检测方法。借助Matlab软件求解频散方程，绘制频散曲线，根据频散曲线分析最佳激励频率及最佳导波模态，进一步得到检测信号的激励方法。结合数据处理及损伤定位方法，给出一套管路损伤的导波检测方法。试验结果表明：使用L(0，2)模态导波有效检测出 25 mm不锈钢管上 2 mm通孔，检测距离达70 m，使用T(0，1)模态导波有效检测出石油管道上的腐蚀缺陷。Abstract: There is an urgent need for a convenient and fast defect inspection for aeronautical pipes and oil pipes. This paper investigated the flaw detection method for pipe-like structure in terms of guided wave technology. The dispersion curves were obtained by solving the dispersion equations in Matlab software. According to these curves, the optimal excitation modes and the corresponding frequency for experiment were determined. Combined with the data process and the defects-locating approach, a set of pipe defects detecting methods were given. Experimental results showed that the L(0,2) mode guided waves could detect the defects of a 2 mm through-hole in 25 mm stainless steel pipe, and the maximal detecting distance could reach up to 70 m; in addition, the corrosion in oil pipes could be found as well by adopting the T(0,1) mode guided waves.
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Keywords:
- Guided waves /
- Pipe defects /
- Dispersion curves /
- Aviation pipes /
- Oil pipes
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