磁场不均匀性对磁流体角速度传感器输出特性影响的研究  

Analysis of the Influence of Non-Uniform Magnetic Field on the Output of Magnetohydrodynamics(MHD)Rate Sensor

作　　者：纪越 陈浩[1,2] 李醒飞[3] JI Yue;CHEN Hao;LI Xingfei(School of Control Science and Engineering,Tiangong University,Tianjin 300387,China;Tianjing Key Laboratory of Intelligent Control of Electrical Equipment,Tiangong University,Tianjin 300387,China;State Key Laboratory of Precision Measuring Technology and Instruments,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津工业大学控制科学与工程学院,天津300387 [2]天津工业大学天津市电气装备智能控制重点实验室,天津300387 [3]天津大学精密测试技术及仪器国家重点实验室,天津300072

出　　处：《传感技术学报》2025年第3期387-393,共7页Chinese Journal of Sensors and Actuators

基　　金：国家自然科学基金面上项目(62173245);国家自然科学基金重点项目(61733012)。

摘　　要：磁感应强度决定了磁流体角速度传感器的标度因数,流体通道中磁感应强度的不均匀性直接影响传感器的时域和频域特性。为了分析磁场不均匀性的影响,使用MHD模块耦合不均匀磁场和流场,将输出电势的振动曲线拟合优度作为评价指标,结果表明:周向不均匀磁场对传感器输出影响最大。针对周向不均匀磁场的仿真表明:均匀磁场与周向不均匀磁场下输出电势波动度分别为0.61%和1.09%,且拟合优度更差,影响输出精度。设计了一种由四块扇形磁铁组成的周向不均匀磁场和整块磁铁构成的磁路进行对比实验,结果表明:0.1 Hz~80 Hz频率范围内,周向不均匀磁场下的输出信号波动度要大于均匀磁场,拟合优度小于均匀磁场,影响了传感器输出稳定性和信号真实性,与仿真结论吻合。The magnetic induction intensity determines the scale factor of the MHD rate sensor,and the time-domain and frequency-domain characteristics of sensors are affected by non-uniform magnetic induction intensity in fluid channels.In order to analyze the in-homogeneity of magnetic circuit,MHD module is used to couple the flow field and the non-uniform magnetic field,and the goodness of fit of the vibration curve of the output potential is taken as the evaluation index.The results of simulation show that the circumferential non-uniform magnetic field has the greatest impact on the sensor output.Simulation is carried out on the circumferential non-uniform magnetic field,results show that fluctuation degress of output potential for uniform magnetic field and circumferential non-uniform mag-netic field are 0.61%and 1.09%,respectively,and the output stability is worse under circumferential non-uniform magnetic field than that under uniform magnetic fields.At the same time,the goodness of fit is worse.A circumferential non-uniform magnetic field com-posed of four fan-shaped magnets and a magnetic circuit composed of a whole magnet are designed for comparative experiments.The ex-periment indicates that the fluctuation degrees of the output signal are bigger and the goodness of fit is worse under the circumferential non-uniform magnetic field than those under the uniform magnetic field within the frequency range of 0.1 Hz-80 Hz,which affects the output stability and signal authenticity of the sensor.The experimental and simulation conclusions are consistent.

关 键 词：磁流体动力学 磁场不均匀性 拟合优度 波动度 

分 类 号：TH73[机械工程—仪器科学与技术]