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高梯度静磁场的多通道磨粒检测传感技术研究
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Research on Multi-channel Online Detection and Sensing Technology of Wear Particles Based on High Gradient Static Magnetic Field
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    摘要:

    针对机械设备磨损在线检测系统存在的大流量和高灵敏度难以同时满足的问题,提出了基于对向布置环形磁铁的多通道磨粒在线检测传感器结构. 通过建立传感器磁特性及铁磁性磨粒磁化的数学模型,推导得到了磨粒通过传感器时磁场扰动的解析解;进而采用仿真与实验的方法验证了传感器结构参数对传感器性能的影响规律. 研究表明,铁磁性球体磨粒通过传感器时,其内部磁感应强度约为背景磁感应强度的3倍,且传感器感应线圈布置于磁铁外边缘比布置于磁铁内边缘时的检测灵敏度高约10.1%;同时,随着磁铁外径及两磁铁轴向间距的增加,传感器输出感应电压呈现先增加后下降的趋势.采用优化后结构参数的传感器可实现直径80 μm铁磁性磨粒的有效检测.

    Abstract:

    Aiming at the difficulty to satisfy the large flow rate and high sensitivity of the online wear detection system for mechanical instruments simultaneously, a multi-channel online wear particle detection sensor structure based on oppositely arranged ring magnets is proposed. By establishing the mathematical model of the magnetic properties of the sensor and the magnetization of ferromagnetic wear particles, the analytical solution of the magnetic perturbation, is derived when the wear particles pass through the sensor . Then, the influence law ofsensor structure parameters on the sensor performance is verified through simulation and experiment. The research results show that the magnetic flux density in a ferromagnetic spherical wear particle passing through the sensor is about three times the background magnetic induction intensity, and the sensitivity of the sensor, when the induction coil is arranged at the outer edge of the magnet, is about 10.1% higher than that the coil is arranged at the inner edge of the magnet. In addition, with the increase of the outer diameter of the magnet and the distance between the two magnets, the induction voltage output by the sensor shows a trend of increasing first and then decreasing, and the sensor with optimized structural parameters can effectively detect the ferromagnetic wear particles with a diameter of 80 μm.

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王立勇 ,王文平 ,贾然 ?,陈涛 ,孙光新 .高梯度静磁场的多通道磨粒检测传感技术研究[J].湖南大学学报:自然科学版,2023,(6):90~98

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  • 在线发布日期: 2023-07-05
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