二频机抖激光捷联系统结构振动分析

二频机抖激光捷联系统中三个激光陀螺抖动会引起惯性器件的耦合振动,产生系统抖动耦合误差,导致惯导系统导航精度下降。二频机抖激光陀螺捷联惯导系统机械结构较为复杂,很难通过解析法求解其振动特性。作者采用有限元方法对二频机抖激光陀螺进行了正弦信号驱动下的瞬态响应分析,并在正弦信号中加入了抖动随机信号,实现了机抖激光陀螺工作状态的仿真。此外,还对二频机抖激光捷联系统的振动特性进行了瞬态响应分析,掌握了系统的耦合振动情况,并进行了功率谱分析。这为激光捷联系统的频率搭配最优化提供了分析方法,对高精度二频机抖激光捷联系统的设计有重要意义。

Structural vibration of mechanically dithered RLG strapdown system

Three RLGs' dithering in the mechanically dithered RLG strapdown system could lead to coupling vibration of the inertial parts and generate dithered coupling error of the system. The structure of the mechanically dithered RLG strapdown system is quite complicated and it is very difficult to solve the vibration characteristics through the analytical method. By using finite element method, the transient response of the mechanically dithered RLG strapdown system driven by sinusoidal signal is analyzed, in which the sinusoidal signal is added with the random dithered signal, and the simulation of working state of dithered RLG is realized. The transient analysis of vibration characteristics of the system is made which can help to obtain the coupling vibration status of mechanically dithered RLG strapdown system, and the spectrum analysis is implemented. They provide a method to optimize the frequency assortment of the system, and it's very important to the design of the system.