电磁超声与电涡流复合检测探头仿真研究

Simulation of electromagnetic ultrasonic and eddy current composite detection probe

以30 mm厚的Q235钢板为被测对象,利用Comsol仿真软件建立了分时复用2D复合检测仿真模型.首先确定电磁超声螺旋线圈的参数,针对位于钢板深处的、不同于空气缺陷的氧化铁夹杂缺陷,利用质点动态电场进行定量分析;然后增加一个电涡流检测线圈的情况下,分析2种复合探头的电涡流检测性能,并且运用支持向量机算法进行缺陷参数反演,对比2种复合探头的电涡流检测准确度.研究表明:复合检测方法可以将电涡流检测方法与电磁超声检测方法进行优劣互补,对于缺陷的检测精度以及缺陷的检测范围都有了明显的改善.在相同条件下,系统层复合线圈涡流检测效果较好,比机理层复合线圈涡流检测准确度高3%.

Taking 30 mm thick Q235 steel plate as the test object,Comsol simulation software was used to establish the time-sharing multiplexing two-dimensional composite detection simulation model.Firstly,the parameters of the electromagnetic ultrasonic spiral coil were determined,and the particle dynamic electric field was used for the quantitative analysis of iron oxide inclusion defects located in the depth of the steel plate,which were different from the air defects.Then,an eddy current detection coil was added to analyze the eddy current detection performance of the two composite probes,and the support vector machine algorithm was used to invert the defect parameters,and the eddy current detection accuracy of the two composite probes was compared.The result shows that our composite test method can combine the advantages of eddy current detecting and electromagnetic ultrasonic testing method.As a result,the defect detection accuracy and defect detection range have improved.Under the same conditions,the eddy current testing system with layer composite coil is better than the one with the mechanism layer composite eddy current testing coil with an accuracy of 3% higher.