混合磁源式磁流变阀的数值研究

Numerical Study on Mixed Magnetic Source Magnetorheological Valve

针对目前磁流变阀的阻尼通道简单、磁流变阀压降调节较小的情况,设计一种基于轴向环形液流通道混合磁源的磁流变阀。阐述混合磁源式磁流变阀的结构及工作原理,推导压降数学模型。采用有限元法对混合磁源式磁流变阀的磁场进行仿真,分析输入电流、液流通道阻尼间隙、圆环厚度和隔磁环厚度对磁流变阀压降变化的影响规律。结果表明:阀的压降随着输入电流的增加逐渐增大,随着液流通道阻尼间隙的增加而减小,随着圆环厚度和隔磁环厚度的增加而减小。其中隔磁环厚度影响最小,液流通道阻尼间隙影响最大。当液流入口速度为4 L/min、输入电流为2 A、液流通道阻尼间隙为1 mm时,混合磁源式磁流变阀的饱和磁致压降可达8.553 2 MPa。

In view of the fact that the damping channel of magnetorheological valve is simple and its pressure drop adjustment is small, a magnetorheological valve based on axial annular liquid flow channel mixed magnetic source was designed.Its structure and working principle were described, and the mathematical model of pressure drop was deduced.The magnetic field of the mixed magnetic source magnetorheological valve was simulated by finite element method. The effects of input current, damping gap of liquid flow channel, ring thickness and magnetic isolation ring thickness on the pressure drop of magnetorheological valve were analyzed.The results show that the pressure drop of the valve gradually increases with the increase of the input current and decreases with the increase of the damping gap of the liquid flow channel.It decreases with the increase of ring thickness and isolation ring thickness. The influence of isolation ring thickness is the smallest, and the influence of liquid flow channel damping gap is the largest.When the liquid inlet velocity is 4 L/min, the input current is 2 A and the damping gap of the liquid channel is 1 mm, the saturated magnetic pressure drop of the mixed magnetic source magnetorheological valve can reach 8.553 2 MPa.