摘要
超声导波在检测存在多个缺陷的管道时,由于其自身的多模态、频散、遇到缺陷易发生模态转换以及缺陷回波间的相互干扰等特性常常引起缺陷信息的误判,论文采用ANSYS软件建立了L(0,2)、T(0,1)模态激发的管道腐蚀超声检测仿真模型以及相关的数值模拟算法,研究了两种模态的导波与管道上不同类型缺陷之间的相互作用,提出了双向激发超声导波管道腐蚀缺陷检测方法,将正反两个方向激发的导波检测数据叠加,减少了缺陷回波的相互影响,准确地识别缺陷位置和大小,提高信噪比。与仿真结果对比分析,实验结果表明,该模拟算法实现了对超声导波管道腐蚀缺陷检测的精确数值模拟,所提的双向激发超声导波检测方法,不仅提高了缺陷定位的精度,也提高了缺陷大小的识别率。
When using ultrasonic guided wave to detect the pipe with multiple defects, due to its multi-modal, dispersion, modal conversion when encountering defects and the mutual interference between echoes, false defect information often exists. This paper uses the ANSYS software to build the simulation model of the L （0,2）, T （0,1） mode excitation of pipeline corrosion ultrasonic testing and associated numerical simulation algorithm, studies the interaction between the two different types of defect mode waveguide and the pipe defect detection method proposed bidirectional pipeline corrosion ultrasonic guided wave excitation, proposes the pros and cons of guided wave testing data in both directions inspired overlay, which reduces interaction of flaw echoes. This method accurately identifies the location and size of defects and improves SNR. Simulation results and comparative analysis of the experimental results show that the simulation algorithm achieves a precise numerical simulation of pipeline corrosion defect detection with ultrasonic guided waves, not only improves the accuracy of defect location, but also improves the size of the defect recognition rate.
出处
《控制工程》
CSCD
北大核心
2015年第2期334-341,共8页
Control Engineering of China
