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首页> 外文期刊>Engineering Structures >Fatigue crack detection in rotating steel shafts using noncontact ultrasonic modulation measurements
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Fatigue crack detection in rotating steel shafts using noncontact ultrasonic modulation measurements

机译：使用非接触式超声调制测量来检测旋转钢轴中的疲劳裂纹

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摘要

In this study, a noncontact fatigue crack detection technique for rotating steel shafts is developed using air-coupled transducers (ACTs). Two ACTs are used for ultrasonic wave generation at two distinctive frequencies, and a third ACT is used for sensing. The proposed technique is based on the premise that nonlinear ultrasonic modulation appears at the sum and difference of two input frequencies in the presence of any crack due to crack opening and closing. First, the spectral correlation (SC) between ultrasonic modulation components at the sum and difference of two input frequencies is computed. Next, an outlier analysis is performed on spectral correlations obtained from different input frequency combinations for automated crack diagnosis. To the best of the authors' knowledge, this is the first study in which a sub-millimeter fatigue crack is detected in a rotating steel shaft using noncontact transducers. In this study, real fatigue cracks on half-scale and full-scale steel shafts used in automobile assembly lines are produced through cyclic loading tests, and the performance of the proposed technique is experimentally validated using ultrasonic response data obtained from the half-scale and full-scale steel shaft specimens. The formation of fatigue cracks is confirmed using fluorescent magnetic particle inspection (MPI), fluorescent penetrant inspection (FPI), and metallographic analysis.
机译：在这项研究中，使用空气耦合传感器（ACT）开发了用于旋转钢轴的非接触式疲劳裂纹检测技术。两个ACT用于产生两个不同频率的超声波，而第三个ACT用于感测。所提出的技术基于这样一个前提，即在由于裂纹的打开和闭合而产生裂纹的情况下，非线性超声调制出现在两个输入频率的和与差处。首先，计算两个输入频率之和与差处的超声调制分量之间的频谱相关性（SC）。接下来，对从不同输入频率组合获得的频谱相关性进行离群分析，以进行自动裂纹诊断。据作者所知，这是第一项使用非接触式传感器在旋转钢轴中检测到亚毫米疲劳裂纹的研究。在这项研究中，通过循环载荷试验在汽车装配线上使用的半尺寸和全尺寸钢轴上产生了真正的疲劳裂纹，并使用从半尺寸和全尺寸获得的超声响应数据通过实验验证了该技术的性能。全尺寸钢轴标本。使用荧光磁粉探伤（MPI），荧光渗透剂探伤（FPI）和金相分析可以确认疲劳裂纹的形成。

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