一种磁流体动力学线振动传感器的结构设计

Structural design and simulation analysis of magnetohydrodynamic linear vibration sensor

阐述了基于磁流体动力学的新型线振动传感器的工作原理及结构设计方法,并对其进行了磁场和运动学仿真。从磁流体动力学基本原理出发,分析了影响传感器输出特性的关键因素,在传感器磁路分析的基础上提出了新型线振动传感器结构设计的方法。利用MAXWELL磁场仿真软件对传感器内部磁路进行了仿真分析。结果表明,设计的磁场均匀度较好(不均匀度<16%)。利用Fluent软件对传感器内部导电流体的运动特性进行了仿真分析。结果表明,传感器的输出灵敏度会受到导电流体的物性参数(密度、黏度和电导率等)、流体通道尺寸参数以及磁场均匀度的影响;此外,由于导电流体运动产生的诱导磁场约在10-8 T量级(≪0.16 T),可以忽略。

The working principle and structural design method of a new linear vibration sensor based on magnetohydrodynamics are described,and magnetic field and kinematics simulations were carried out.Starting from the basic principle of magnetohydrodynamics,the key factors affecting the output characteristics of the sensor were analyzed.Based on the analysis of the magnetic circuit of the sensor,a new structural design method of the linear vibration sensor was proposed.The MAXWELL magnetic field simulation software was used to simulate and analyze the internal magnetic circuit of the sensor.The results show that the designed magnetic field has good uniformity(unevenness<16%).Fluent software was used to simulate and analyze the movement characteristics of the conductive fluid inside the sensor.The results show that the output sensitivity of the sensor will be affected by the physical parameters of the conductive fluid(density,viscosity,conductivity,etc.),fluid channel size parameters,and magnetic field uniformity.In addition,the induced magnetic field due to the movement of the conductive fluid is about 10-8 T(≪0.16 T),which can be ignored.