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以连铸结晶器内的45号钢薄板坯为研究对象,采用有限元软件ANSYS建立多频电涡流测多层板厚度模型。采用激励频率优选法选择2个最优频率对传感器线圈进行激励,研究固液相区板层总厚度不变,凝固坯壳层厚度变化以及固液相区板层和凝固坯壳厚度层同时变化的2种情况下传感器输出信号规律。通过Matlab对数据进行拟合和对拟合进行残差分析。研究结果表明:多频测量坯壳厚度的激励频率可以通过频率优选法进行选取,同时坯壳厚度变化与电压幅值呈现出良好的线性关系,通过残差图也可以看出各个采样点的拟合情况良好。
Taking the 45 # steel slab in continuous casting mold as the research object, a finite element software ANSYS was used to establish multi-frequency eddy current multi-layer thickness model. The optimum frequency of the excitation frequency was used to select the two optimal frequencies to excite the sensor coil. The total thickness of the solid-liquid zone plate, the thickness of the solidified shell and the thickness of the solidified shell were also studied. 2 kinds of cases the sensor output signal law. The data were fitted by Matlab and the residuals were analyzed for the fit. The results show that the excitation frequency of the multi-frequency measurement of the blank shell thickness can be selected by the frequency optimization method, and the change of the thickness of the blank shell shows a good linear relationship with the voltage amplitude. The residual plot also shows that the fitting of each sampling point In good condition.