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首页> 外文会议>National Technical Training Symposium and Twenty-Sixth Annual Meeting, Jun 18-20, 2002 >CRACK PARAMETER IDENTIFICATION USING INVERSE ANALYSIS OF ON-LINE VIBRATION MEASUREMENTS
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CRACK PARAMETER IDENTIFICATION USING INVERSE ANALYSIS OF ON-LINE VIBRATION MEASUREMENTS

机译：基于在线振动测量反分析的裂纹参数识别

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摘要

Crack size and location of a slow rotating drum with a transverse crack are estimated using an inverse analysis technique. Crack parameter estimation is achieved by minimizing an error function quantifying the difference of the measured and modeled vibration signal. Vibration measurements are made using eddy-current proximity probes. The modeled vibration signal is the result of a 3D solid Finite Element analysis. Model inputs consist of the applied load, crack size and location. Measured and modeled vibration signals are Fourier transformed and comparison of the Fourier coefficients yields the basis of the error function. The error function is minimized using a quadratic optimization algorithm until the model inputs represent the true crack parameters. A variety of combinations of crack size and location have been investigated. The results show the influence of various error functions and identifies the most important vibration components. For a known crack location the inverse analysis yields an estimated crack size within 10% of the true crack size. For unknown crack location and size the results are a combination of estimated crack size and a probability measure as a function of location. The method has been implemented on a test rotor where the analysis is performed while the rotor is in operation.
机译：裂纹的大小和带有横向裂纹的慢速旋转鼓的位置使用逆分析技术进行估算。裂纹参数估计是通过最小化误差函数来实现的，该误差函数可量化所测量和建模的振动信号之间的差异。使用涡流接近探头进行振动测量。建模的振动信号是3D实体有限元分析的结果。模型输入包括施加的载荷，裂纹尺寸和位置。对测量和建模的振动信号进行傅立叶变换，并且对傅立叶系数进行比较就可以得出误差函数的基础。使用二次优化算法将误差函数最小化，直到模型输入代表真实的裂纹参数为止。已经研究了裂纹尺寸和位置的各种组合。结果显示了各种误差函数的影响，并确定了最重要的振动分量。对于已知的裂纹位置，反分析得出的估计裂纹尺寸在真实裂纹尺寸的10％之内。对于未知的裂纹位置和大小，结果是估计的裂纹大小和作为位置函数的概率度量的组合。该方法已在测试转子上实施，该测试在转子运行时进行分析。

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