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垂向减振器铆接微间隙易造成铆钉松动,危及地铁的安全。针对铆钉-孔之间微间隙难以有效检测与定量评估的问题,进行了远场涡流检测技术的仿真研究,研制了专用RFECT(Remote Field Eddy Current Testing)探头,开展了垂向减振器铆接微间隙的检测试验。研究结果表明,RFECT信号幅值仿真结果与铆接微间隙有较好的线性关系,幅值指标优于相位指标。实际检测结果与仿真结果相吻合,能够有效评价垂向减振器铆接微间隙。为有效区分微间隙,最佳激励频率为80~120 Hz。
Vibration vertical riveting micro-gap easily lead to loose rivets, endangering the safety of the subway. Aiming at the problem that it is difficult to effectively detect and quantitatively evaluate the micro clearance between the rivet and the hole, a simulation study on the far-field eddy current testing technology is carried out. A special RFECT (Remote Field Eddy Current Testing) probe is developed and the riveting micro- Clearance test. The results show that the amplitude of RFECT signal has a good linear relationship with the riveted micro-gap, and the amplitude index is better than the phase index. The actual test results are in good agreement with the simulation results, which can effectively evaluate the micro-gap of vertical vibration damper riveting. In order to effectively distinguish the micro-gap, the optimal excitation frequency is 80 ~ 120 Hz.