【摘要】 为保障TBM高效安全运行，提出一种脉冲涡流检测（PECT）的刀圈径向磨损量无损检测方法。先基于Maxwell时变电磁场理论建立有限元模型，采用控制变量法探究线圈高度、内半径和外半径3个激励线圈参数的优化策略；再搭建刀圈径向梯度化磨损量无损检测有限元模型，研究刀圈径向磨损量与前期电压信号积分值的映射关系，提取可连续反映刀圈磨损程度的特征量，并研究不同提离距离下刀圈径向磨损量与特征量的映射关系。结果表明：在给定激励线圈外半径取值的前提下合理调节内半径取值，可最大程度兼顾对激励线圈高分辨率、强耦合程度的要求；检测线圈与刀圈的最远距离为64 mm，在满足48.26 cm刀圈最大径向磨损量为35 mm的基础上保留了29 mm余量，比传统涡流检测的最远提离距离提高了83%；该方法提高了探头远距离检测能力，保障了探头安装空间，同时显著降低了探头被岩碴刮擦损伤的风险。更多还原

【Abstract】 In order to ensure the efficient and safe operation of TBM, a non-destructive detection method of the radial wear quantity for the cutter ring based on pulsed eddy current testing(PECT) is proposed. Firstly, based on Maxwell time-varying electromagnetic field theory, the finite element model was established, and the control variable method was adopted to explore the optimization strategy of 3 excitation coil parameters including its height, inner radius and outer radius. Then, the finite element model of non-destructive detection for radial gradient wear quantity of cutter ring was established to study the mapping relationship between radial wear quantity of the cutter ring and the integral value of the previous voltage signal; and the feature quantity that can continuously reflect the wear degree of the cutter ring was extracted to study the mapping relationship between radial wear quantity of the cutter ring and the feature quantity under different lift-off distances. The research results show that the requirement of high resolution and strong coupling of excitation coil can be taken into account to the greatest degree by adjusting the value of inner radius reasonably on the premise of giving fixed value for the outer radius of excitation radius. The farthest distance between the detection coil and the cutter ring is 64 mm, which retains a 29 mm margin on the basis of meeting the maximum radial wear quantity of 35 mm for the 48. 26 cm cutter ring, which is 83% higher than the farthest lift-off distance detected by the traditional eddy current. The proposed method has improved the long-distance detection capability of the probe, provided a guarantee for the probe installation space, and significantly reduced the risk of the probe being scratched by rock ballast.更多还原