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应用理想裂纹模型可以把三维的裂纹探伤涡流场问题简化为求解一个二维积分方程 ,从而大大减少计算量。利用该方法对蒸汽发生器管道涡流检测 Benchmark问题进行了数值模拟 ,计算值与实验值吻合良好。给出了扰动涡流场的分布图象 ,研究了线圈阻抗增量曲线与裂纹长度变化的关系。通过这些分析可以建立扰动涡流场的直观图象 ,帮助理解缺陷与涡流的作用机理 ,寻找合适的求解方法以及作为探头优化设计和缺陷识别的参考依据。
The application of the ideal crack model can simplify the three-dimensional crack flaw detection eddy current problem to solve a two-dimensional integral equation, thus greatly reducing the amount of calculation. This method is used to simulate the Benchmark problem of vortex detection in steam generator. The calculated values are in good agreement with the experimental data. The distribution of perturbed eddy current field is given, and the relationship between the increment of coil impedance and the change of crack length is studied. Through these analyzes, an intuitive image of the perturbed eddy current field can be established to help understand the mechanism of defects and eddy currents, find suitable solutions, and serve as a reference for optimal probe design and defect identification.