【摘要】 在磁流体惯性传感结构中,磁流耦合效应对传感特性有直接影响。通过推导磁流耦合公式、分析固壁界面效应以及评价阻尼影响因素,实现了传感结构中磁流固分析。基于经典流体动力学理论,视磁流体为非极性流体,联立解算了耦合效应下磁流体力学方程。对理论方程进行分步建模,建立不同域积分变量,完成不同结构传感运动块的磁流阻力分析及数值计算。流固数值计算及实验结果表明:理论推导与实验结果相符。在磁性控制下粘度对流阻影响幅度较大,2槽和6槽结构圆柱在重力作用下自由下落时间分别为0.39 s和0.46 s,多槽结构在减少极端压差的同时能够补偿流阻损失,可以达到增阻和减少位移的效果。更多还原

【Abstract】 A new type sensor based on the levitation character was introduced for avoiding the direct mechanical contact and reducing the mechanical friction,for the magnetic-current couple effect could directly influence on the sensor characters.The magnetic-fluid-solid of the sensor structure was analyzed by deriving magnetic-fluid coupling equation,analyzing solid interface effect and evaluating damping influence.Moreorer,based on the classical hydrodynamic theory,the kinematic viscosity equation obtained by fitting experimental data was solved by a fluid equation,when magnetic fluid was considered as nonpolar fluid.The methods of step modeling and integral variable setting in different fields were used to analyze the theory equation.Numerical calculation and experimental results indicate that the falling time of 2-groove structure and 6-groove structure is 0.39 s and 0.46 s,respectively,and reducing the differential pressure between the sides of structure with more grooves can compensate the damp loss and can increase the magnetic-current damp and reduce the displacement,which shows the theoretical deduction is coinciden with the experimental results well.更多还原