LVDT重复性影响因素及优化方法研究  

Investigation of Influencing Factors and Optimization Methods for Repeatability of LVDT

作　　者：王小英 黄劼[1] 龙浩辰 姚锐 秦玉芳 WANG Xiaoying;HUANG Jie;LONG Haochen;YAO Rui;QIN Yufang(School of Mechanical Engineering,Sichuan University;Army logistics Academy)

机构地区：[1]四川大学机械工程学院 [2]中国人民解放军陆军勤务学院

出　　处：《仪表技术与传感器》2024年第8期19-24,共6页Instrument Technique and Sensor

基　　金：川大-自贡战略合作专项资金项目(2021CDZG-16);凉山州科技重点研发计划项目(21ZDYF0198)。

摘　　要：针对LVDT在使用中重复性受外界因素影响的问题,进行了理论分析与软件仿真,认为LVDT的铁心受干扰时会产生径向跳动,从几何关系与磁场两方面使测量结果产生误差。文中设计了LVDT重复性测试系统,在LVDT量程范围内选取5、15、25 mm 3个测量点进行测试,结果表明理论分析与实际测试具备良好的一致性。为提高LVDT的重复性,提出用精密直线轴承限制LVDT铁心的径向运动。优化后,5、15、25 mm处测量值的重复性标准差分别从0.07323、0.12633、0.15966 mm降低到0.03757、0.04868、0.04301 mm,测量值的离散程度明显减小,验证了优化方法的可行性和有效性。A theoretical analysis and software simulation were conducted for issues concerning the impact of external factors on the repeatability of LVDT in use.It suggested that when the LVDT core was disrupted,radial jitter occurred,causing measurement errors from both geometric relations and magnetic fields.A repeatability testing system for LVDT was designed in this paper.Three measuring points within the LVDT scale range including 5 mm,15 mm and 25 mm were chosen for testing.The results exhibited good consistency between theoretical analysis and testing.To enhance the repeatability of LVDT,the approach of using precision linear bearings to limit the radial motion of the LVDT core was proposed.After optimization,the standard deviations of the measurement repeatability at 5 mm,15 mm and 25 mm reduce respectively from 0.07323 mm,0.12633 mm,0.15966 mm to 0.03757 mm,0.04868 mm,0.04301 mm.The dispersion of the measurement values significantly decreased,verifying the feasibility and effectiveness of the optimization method.

关 键 词：LVDT 重复性 径向跳动 非轴向偏移 互感变化 结构优化 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]