Numerical Investigation of Laser Gyro Damping System of Strap-down Inertial Navigation

摘要

The present work is focused on the numerical investigations of the damping system of strap-down inertial navigation acted on the random factors in flight state.The output Spectrums of the response were computed by using Transfer Matrix Method of Multibody System (MS-TMM).Dynamics model of multibody system was developed for the damping system of strap-down inertial navigation,while the transfer equations,matrices of the damping system were derived,and the overall transfer equation,overall transfer matrix were derived and the power spectrum density of system response were obtained.The feasibility of using transfer matrix method of multibody system to estimate the natural frequencies and mode shapes for the damping system is explored theoretically.Based on the vibration characteristics,the dynamics response of system has been evaluated by general vibration method and this method.The feasibility and effectiveness of this method was verified by the simulation results.Computational analysis and discussion along with pertinent conclusions are presented.This method had numerous advantages of modeling flexibility and higher computational speed without developing global dynamics equations.Compared with other dynamic methods,this method was more beneficial to analysis of laser gyro strap-down inertial navigation system,and the new technology method has been provided for the damping system of strap-down inertial navigation.