多泵磁流体动力学角速度传感器的低频拓展设计研究

Research on low frequency extension design of the magnetohydrodynamic angular velocity sensor with multiple magnetohydrodymamic pump

针对磁流体动力角速度传感器对低频(<1 Hz)信号检测性能差的问题,在原有的角速度传感器的基础上提出了一种含多磁流体动力泵的角速度传感器。采用改进传感器机械结构的方法,在流体通道边缘周向上均匀构建多个磁流体动力泵,并优化了流体泵磁极形状,以提高流体传感环中径向流速分布大小与稳定性,增强低频下科里奥利力效应。仿真与实验结果表明设计的多泵结构传感器相比于单泵结构,径向流速分布提高了20.28%,流体泵通道磁场均匀度增加了38.36%。测试实验中施加补偿电流后,传感器可以实现对低频角速度信号的检测,全通带范围内幅值波动误差小于0.5%,相位差减小到0~10°范围内。

To improve performance of the magnetohydrodynamic angular velocity sensor in detecting signals at low frequency(<1 Hz),a new magnetohydrodynamic angular velocity sensor with multiple magnetohydrodynamic pumps is proposed,which is based on the magnetohydrodynamic angular velocity sensor.In the aspect of improving the mechanical structure,three magnetohydrodynamic pumps are constructed uniformly around the edge of the fluid channel.To enhance the Coriolis force effect at low frequency,the magnetic pole shape of the fluid pump is optimized to improve the magnitude and stability of the radial flow velocity distribution.Compared with the single pump structure,the simulation and experiment results of the designed structure with multiple MHD pumps show that the radial velocity distribution is increased by 20.28%,and the magnetic field uniformity of fluid pump channel is increased by 38.36%.Results indicate that the modified sensor with the applied low frequency compensation current can detect the angular velocity signal at low frequency.Through the whole bandwidth,the amplitude fluctuation error is less than 0.5%,and the phase difference is reduced to the range of 0~10°.