Lift-off suppression algorithm for dual-frequency alternating current field measurement
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摘要: 航空装备结构表面多为铆钉连接件，其在检测过程中容易产生提离扰动，造成缺陷的漏检或误判。基于交流电磁场检测原理，引入双频激励技术，设计开发了一套集检测探头-双频激励-检测机箱为一体的结构缺陷双频交流电磁场检测系统，研究了提离抖动条件下干扰信号的畸变机理，提出了基于双频响应信号的交流电磁场提离抖动抑制算法，开展了提离抖动抑制试验。结果表明，双频交流电磁场提离抑制算法可有效去除由提离扰动引起的干扰信号，增强了判断缺陷信号的准确率。Abstract: Since the surface of the aviation equipment structure is mostly rivet connectors, it is easy to produce lift-off disturbances during the inspection process, resulting in missing detection or misjudgment of defects. Based on the alternating current field measurement, this paper introduced dual-frequency excitation technology, designed and developed a set of integrated the dual-frequency ACFM detection system for structural defects which integrates detection probe, dual-frequency excitation and detection chassis, studied the mechanism of interference signal distortion under lift-off jitter conditions, and proposed an ACFM lift-off jitter suppression algorithm based on dual-frequency response signals, and carried out lift-off jitter suppression experiment, the experimental results show that the dual-frequency ACFM lift-off suppression algorithm can effectively remove the interference signal caused by the lift-off disturbance, and enhance the accuracy of the defect signal judgment.
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