摘要
为了提高激光陀螺旋转惯导系统的环境适应性,需要对惯性测量单元(IMU)进行磁屏蔽设计。对IMU的磁屏蔽效率进行了理论计算和有限元仿真,对磁屏蔽材料的厚度、接缝宽度及接缝处贴片的大小等参数进行了仿真分析。利用赫姆霍兹线圈对IMU进行了磁敏感性测试,实验结果表明:设计的IMU磁屏蔽结构的屏蔽效率在23～30 dB范围内,磁场引起的三个激光陀螺漂移小于0.002°/h/mT,满足高精度单轴旋转惯导系统的实用要求。该方法对旋转惯导系统的结构设计及磁屏蔽设计具有一定的参考意义。
In order to improve the adaptability of ring laser gyroscope（RLG） single-axis rotation inertial navigation system（INS） in magnetic environment,the magnetic shielding design of its inertial measurement unit（IMU） is conducted.The magnetic shielding efficiency of the IMU is calculated theoretically and simulated by finite element method.The thickness of material,width of joint and length of chock are emulated by ANSYS.By testing the IMU in Helmholtz coil,it is found that the shielding efficiency of structure is in the range of 23 to 30 dB and the RLG drift induced by magnetic field is less than 0.002 °/h/mT,which can satisfy the requirements of high precision RLG single-axis rotation INS.This method can provide some references for structure design and magnetic shielding design of the rotation INS.
出处
《中国惯性技术学报》
EI
CSCD
北大核心
2012年第3期283-286,共4页
Journal of Chinese Inertial Technology
关键词
激光陀螺
磁屏蔽
有限元分析
ring laser gyroscope
magnetic shielding
finite element analysis
