捷联惯导减振器参数估计与光纤环应力响应分析

Parameters estimate for damper of strap-down inertial navigation system and stress analysis of optic-fiber rings

建立了捷联惯导系统的有限元模型,提出用单自由度弹簧振子模型估计减振器的刚度和阻尼系数的方法,并得到实验的验证。提出用一维系统低频逼近多自由度解耦系统的近似分析方法。解释了陀螺随机振动响应曲线高频波动的原因。分析了光纤环的材料刚度和几何参数对其内应力的影响规律。

FEM model of strap-down inertial navigation system is established.Besides,an approach of estimating damper＇s stiffness and dampness coefficient is introduced,with single degree of freedom spring-mass model,and the simulation agrees with the experiment result.Other than,an approximate analysis method is studied,using one dimensionality system to analyze the multi-DOF decouple system in low-frequency band,and it explains the reason of hi-frequency fluctuation in the response curve of FOG＇s random vibration.Finally,it indicates that the fiber-ring＇s material stiffness and geometry parameters have effects on it＇s internal stress.