激光陀螺捷联惯导系统IMU结构模态分析

摘要

随着机抖激光陀螺捷联惯导系统以其诸多优点在军用与民用导航领域得到广泛的应用,对其体积和重量的要求变得越来越严格.机抖激光捷联惯导系统IMU小型化设计的关键在于减振系统的设计,而减振器仿真模型的建立是该减振系统模态仿真分析的难点.针对这一问题,提出一种通过ANSYS中的“Bushing连接”来模拟减振器的方法,并利用模态实验结果修正其参数,最终建立了一个准确的减振器模型,实现了对捷联惯导IMU振动模态的精确仿真与分析,为其IMU结构的进一步小型化设计奠定了基础,%The strap-down inertial navigation system with mechanically dithered ring laser gyro is widely used in the field of military and civilian navigation with many advantages, and the requirements of its size and weight become more and more stringent. The design of damping system is the key to the system miniaturized design. However, the establishment of damper simulation model is difficult in modal simulation analysis of damping system. To solve this problem, a method using "Bushing Joint" in ANSYS to simulate the damper is proposed, and the modal experiment results are used to correct its parameters. Finally, a precise model of damper is established, which can be used to implement accurate simulation and analysis for the vibration modal of strap-down inertial navigation IMU. It lays the foundation for the further miniaturized design of IMU structure.