复合绝缘子内部缺陷超声全聚焦检测仿真及实验研究  

Simulation Research on Ultrasonic Total Focus Method Detection of Internal Defects of Composite Insulators

作　　者：赵洲峰 黄锦瀚 罗宏建 胡宏伟[3] ZHAO Zhoufeng;HUANG Jinhan;LUO Hongjian;HU Hongwei(State Grid Zhejiang Electric Power Research Institute,Hangzhou 310014,China;Zhejiang Electric Boiler and Pressure Vessel Inspection Institute Co.Ltd.,Hangzhou 310014,China;College of Automotive and Mechanical,Changsha University of Science and Technology,Changsha 410114,China)

机构地区：[1]国网浙江省电力公司电力科学研究院,浙江杭州310014 [2]浙江省电力锅炉压力容器检验所有限公司,浙江杭州310014 [3]长沙理工大学汽车与机械工程学院,湖南长沙410114

出　　处：《压电与声光》2024年第1期136-142,共7页Piezoelectrics & Acoustooptics

基　　金：浙江省电力锅炉压力容器检验所有限公司科技项目:GJRD2022-01复合绝缘子相控阵超声检测技术研究及装置开发。

摘　　要：针对复合绝缘子高声衰减性导致的内部缺陷超声检测定位定量差的问题,采用全聚焦方法(TTFM)改善检测质量。基于k-Wave工具箱开展复合绝缘子内部缺陷超声全聚焦检测仿真研究,讨论频率、相控阵阵元数、缺陷尺寸等因素对检测结果的影响并开展检测实验。结果表明,采用全聚焦方法检测复合绝缘子内部缺陷的效果良好。频率对检测结果的影响较大,选择较大频率时超声波的穿透力减弱,超声波在复合绝缘子中的衰减系数增加;选择较小频率时探头检测分辨力降低,影响缺陷的定量,所以在检测复合绝缘子时应选用合适的频率,选用的4种不同频率中2.5 MHz频率的成像效果综合最佳。阵元数和缺陷尺寸对检测结果影响较小,在实际检测中应根据实际工程需要选择合适的阵元数。研究结果为超声全聚焦方法检测复合绝缘子内部缺陷提供了理论依据。Aiming at the problem of poor positioning and quantification of internal defects in ultrasonic testing of composite insulators caused by high acoustic attenuation,the total focus method(TFM)is used to improve the detection quality.Based on the k-Wave toolbox,the simulation of ultrasonic total focus detection of internal defects of composite insulators is carried out.The effects of frequency,number of phased array elements,defect size and other factors on the detection results are discussed and the detection experiments are carried out.The results show that the full focusing method is effective in detecting the internal defects of composite insulators.The frequency has a great influence on the detection results.When the frequency is larger,the penetration force of the ultrasonic wave is weakened,and the attenuation coefficient of the ultrasonic wave in the composite insulator is increased.When the smaller frequency is selected,the detection resolution of the probe is reduced,which affects the quantification of the defect.Therefore,the appropriate frequency should be selected when detecting the composite insulator.The imaging effect of the 2.5 MHz frequency is the best among the four different frequencies.The number of array elements and defect size have little effect on the detection results.In the actual detection,the appropriate number of array elements should be selected according to the actual engineering needs.The research results provide a theoretical basis for the ultrasonic total focus method to detect the internal defects of composite insulators.

关 键 词：复合绝缘子 全聚焦方法 超声成像 k-Wave仿真 

分 类 号：TB553[理学—物理] TN27[理学—声学]