盾构机刀盘大壁厚焊缝超声相控阵探伤仿真研究OA
Research on Phased Array Simulation of Weld Defects in Shield Tunneling Cutterhead
针对盾构机刀盘角焊缝质量检测中传统超声检测效率偏低、声束覆盖范围不足等问题,提出基于超声相控阵的快速成像检测方法.采用有限元软件进行数值模拟,设计了声束覆盖角焊缝的扫查方式.仿真结果表明:当采用1 MHz中心频率、0.5 mm阵元间距的楔块斜探头时,可实现45°～70°的有效声束偏转,对角焊缝出现的裂纹情况进行有效检测.在此基础上,引入相干因子(CF)对传统全聚焦成像结果进行像素级加权处理,有效抑制虚影与噪声干扰,提升缺陷图像的对比度与边界清晰度.所提方法面向盾构刀盘角焊缝区域的大壁厚结构特征进行建模与成像分析,研究成果为后续专用超声相控阵传感器的设计以及检测实验提供理论依据.
To address the low efficiency and incomplete coverage of conventional ultrasonic testing in detecting weld quality at the fillet welds of shield machine cutterheads,a rapid imaging detection method based on ultra-sonic phased array is proposed.Numerical simulations were carried out using finite element software to design the sound beam scanning strategy for weld coverage.Simulation results indicate that when a wedge probe with a center frequency of 1 MHz and an element spacing of 0.5 mm is employed,an effective beam deflection ranging from 45°～70° can be achieved,enabling accurate detection of cracks in fillet welds.On this basis,a coherence factor(CF)weighting algorithm was applied to the traditional total focusing method(TFM)imaging to enhance pixel-level consistency,effectively suppressing artifacts and noise,and improving image contrast and edge clari-ty.The proposed method is specifically tailored for thick-walled cutterhead structures with complex fillet weld geometries.The results provide a theoretical foundation for the subsequent development of dedicated phased ar-ray probes and experimental procedures.
李龙;李东升;杨伦磊;宋文涛;马怀祥
石家庄铁道大学机械工程学院,河北 石家庄 050043中铁十四局集团装备有限公司,江苏 南通 226000中铁十四局集团装备有限公司,江苏 南通 226000石家庄铁道大学机械工程学院,河北 石家庄 050043石家庄铁道大学机械工程学院,河北 石家庄 050043
交通工程
盾构机刀盘大壁厚超声相控阵角焊缝探伤相干因子
shield machine cutterheadthick-walled weldultrasonic phased arrayfillet weld detectioncoher-ence factor
《华东交通大学学报》 2026 (4)
1-10,10
河北省自然科学基金项目(E2019210309)中铁十四局集团装备有限公司科研项目(CRCC14-ZB-KYHT-2023-002)
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