磁弹耦合扭转波位移传感器输出电压理论研究  

Theoretical Study on Output Voltage of Magnetoelastic Coupling Torsional Wave Displacement Sensor

作　　者：鲍丙豪[1] 张小蝶 张元胜 BAO Binghao;ZHANG Xiaodie;ZHANG Yuansheng(School of Mechanical Engineering,Jiangsu University,Zhenjiang Jiangsu 212013,China)

机构地区：[1]江苏大学机械工程学院,江苏镇江212013

出　　处：《传感技术学报》2018年第6期847-852,共6页Chinese Journal of Sensors and Actuators

基　　金：江苏大学第十六批大学生科研立项项目(16A214)

摘　　要：磁弹耦合位移传感器感应线圈电压是由应力波引起的磁化强度变化决定的,而应力与偏置磁铁处的材料磁导率密切相关,因此磁导率与磁化强度变化率的确定是建立输出电压模型的关键。根据铁磁材料的弹性力学理论和磁机耦合模型,确定了扭转波运动方程;建立材料等效场分布模型,并结合麦克斯韦方程和磁化强度进动方程,确定波导丝磁导率;根据磁机效应的Jiles-Atherton理论,建立了波导丝弹性形变感应磁化强度模型。根据磁导率及磁化强度模型,并借助电磁感应定律构建了感应线圈的输出电压模型。利用实验平台验证了接收线圈匝数和激励脉冲的脉宽、频率对输出电压的影响,为磁弹耦合位移传感器的研究提供了理论依据。The coil voltage of Magnetoelastic coupling displacement sensor is determined by change rate of magnetization by stress waves,which is related to the permeability of the material at the position of bias magnet. Therefore,determining permeability and change rate of magnetization is the key to establishing model. Firstly,according to the elastic mechanics model and magnetically coupled model of ferromagnetic material,the torsional wave motion equation is determined. Then the magnetic permeability of the wire is obtained by establishing the equivalent field distribution model combined with the Maxwell equation and the magnetization precession equation,and the change rate of magnetization is obtained with the Jiles-Atherton theory. Finally,the coil output voltage is obtained according to the law of electromagnetic induction. The effects of coil turns,pulse width and period on the output voltage are proved by experimental platform,which provides theoretical basis for the study of magnetoelastic coupling displacement sensor.

关 键 词：磁弹耦合 电压模型 扭转振动模型 磁导率 磁化模型 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置]