Analysis of the factors influencing the performance of magnetostrictive guided wave pipeline strip sensor
GENG Haiquan¹, ZOU Gang¹, WANG Yuemin², ZHU Longxiang¹
1. Naval Aviation University (Qingdao Campus), Qingdao 266041, China;
2. College of Power Engineering, Naval University of Engineering, Wuhan 430033, China
Abstract: The effects of the structure of the magnetostrictive strip sensor, the bias magnetic field and the excitation current on the performance of the sensor have been studied by experimental method. The results show that the structure of the sensor plays an important role in the mode control of the guided wave, and the longitudinal guided wave can be excited by means of the circumferential or axial sticking of the Fe-Co strip and the longitudinal pre magnetization; the torsional guided wave can be excited by means of the circumferential sticking of the permanent magnet, while the excitation effect of the permanent magnet at different circumferential positions is different, when the permanent magnet is at the opening of the strip, the torsional wave excited is more pure. With the increase of the bias magnetic field, the amplitude of the guided wave increases first and then decreases, and the amplitude of the guided wave at each frequency has a maximum value. The magnitude of the excitation current affects the amplitude and mode purity of the torsional wave. With the increase of the excitation current, the amplitude of the torsional wave increases first approximately linearly, and then tends to remain or decrease. When the excitation current is large, the detection signal has a large amplitude of longitudinal wave, reducing the excitation current can reduce the amplitude of longitudinal wave, but it is difficult to eliminate.
Keywords: magnetostrictive guided waves;strip sensor;bias magnetic field;excitation current
2020, 46(12):156-162  收稿日期: 2020-05-25;收到修改稿日期: 2020-07-08
基金项目: 国防预研基金（9140A27020115JB11001）
作者简介: 耿海泉(1989-),男,山东邹平市人,讲师,博士,主要从事飞行器结构健康监测和故障诊断技术研究
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