捷联惯导系统减振设计

机抖激光陀螺的捷联惯性导航系统结构设计的关键在于惯性测量单元（IMU）的减振设计。文章描述了一种IMU减振系统设计的方法,并在实际应用当中获得良好的效果。IMU减振系统的设计方法主要分为三大内容。首先是对减振系统中减振器的布局方案进行仿真分析,建立减振系统的六自由度振动响应模型,研究减振器布局方案的频谱特性,比较得到减振效果较优的减振器方案。然后针对获得的减振器布局方案,设计IMU结构框架和各向同性的减振器,并采用有限元的方法,对IMU的减振系统进行模态分析,获得IMU减振系统的前20阶模态频率和振型,用有限元仿真分析的方法来验证减振设计。目前这种IMU减振系统的设计方法已应用到某新型捷联惯导系统当中,减少了系统陀螺精度的降低。

Damping design of strapdown inertial navigation system

The design of vibration damping of inertial measurement unit (IMU) is key to structural design of the mechanically dithered ring laser gyroscope (DRLG) strapdown inertial navigation system(SINS). This paper describes a method for designing a IMU damping system. Firstly, it establishes the six-freedom vibration response model of different damping system solutions and studies their spectral characteristics. Through comparing, a better damper scheme is obtained. Secondly, based on the selected damping scheme, it designs the IMU's structure and the isotropic absorber. Finally, using the finite element software Patran/Marc, the modal analysis of DRLG IMU damping system is made, the IMU's 20-order damping system modal frequencies and mode shapes are given, and the structure design is verified. At present, the IMU damping system adopting this design method has been applied in a new type of SINS.