捷联惯组空间八点减振IMU组合设计CSCD

为了研究捷联惯组空间八点减振IMU组合的力学性能及其在抑制线角耦合方面的作用,采用NX三维建模及ANSYS仿真分析工具对IMU组合的刚度、减振器的线角频率、减振性能方面进行了充分的理论验证。同时,推导出平衡机的调平原理,通过调平使IMU弹性中心与质心重合,然后对惯组进行振动试验,观察其减振性能及三向陀螺角速度输出值。结果表明,经理论分析该IMU组合模态为875.7Hz,具备足够的刚度;减振器线角频率差值在50Hz以上,具有较高的离散度。经试验验证,该IMU组合调平小于0.1mm时,减振效率不低于42%,三向陀螺角速度输出不大于11(°)/s,具有较好的力学环境适应性与极高的角速度输出特性。

Design of Spat ial Eight-Point Vibration Reduction IMU for SINS

In order to study the mechanical properties and role in restraining vibration coupling of spatial eight-point vibration reduction IMU in strapdown inertial navigation system (SINS), this paper makes a comprehensive theoretical verification on the stiffness of the IMU, line angle frequency of shock absorber and damping performance using NX and ANSYS. At the same time, the leveling principle of the balancer is deduced. The elastic center coincides the center of mass through leveling, and then the vibration test of SINS is carried out to observe its damping performance and the angular velocity output of the three gyroscopes. Through theoretical analysis, the results show that the IMU mode is 875.7Hz, showing its high stiffness. The linear angular frequency difference of the shock absorber is more than 50Hz, showing its high dispersion. The experimental results show that the damping efficiency is not lower than 42% with IMU combined leveling less than 0.1mm, and the angular velocity outputs of three gyroscopes are not more than 11(°)/s. The IMU has good mechanical environments adaptability and extremely high angular velocity output characteristics.