基于正交试验的钢板缺陷红外热像检测数值模拟

Numerical simulation on infrared thermography inspection of defects of steel plate based on orthogonal test

使用ANSYS软件,对铸钢薄板内部裂纹的电磁激励红外热像检测进行了数值模拟研究。并通过正交试验设计,综合研究了激励电流密度和频率、线圈提离高度、裂纹深度以及裂纹的埋藏深度等因素,对最大温差、可检测持续时间以及检测响应速度等缺陷可检测性指标的影响;通过极差分析,比较了各因素对最大温差的影响作用。结果表明,对于长度、宽度确定的裂纹缺陷,以上各因素对其可检测性影响的重要程度依次为:激励电流密度>激励频率>裂纹的埋藏深度>线圈提离高度>裂纹深度。

In the paper, ANSYS was applied to numerically simulate the detection of the crack inside the casting steel sheet based on electromagnetic excitation infrared thermography. An orthogonal test was designed to overall study the influence of such factors as the density and frequency of excitation current, lift-off height of coil, depth and buried depth of crack etc on such detectability indexes as maximum temperature difference, continual detectable duration and detection response velocity etc, and the influences of various factors on maximum temperature difference were compared via range analysis. The results showed： as for the length and width determined crack, the importance order of the factors affecting the detectability was density of excitation current, excitation frequency, buried depth of crack, lift-off height of coil and crack depth.