Vibration response analysis of lightweight INS and optimization of vibration absorber

The structure flexibility caused by lightweight design of inertial navigation system (INS) will generate a non-negligible influence on the vibration response of INS. Aiming at a certain lightweight inertial navigation structure, the dynamic model of the INS is established through adopting the substructure synthesis method based on frequency response functions. Subsequently, the influence of IMU flexibility on the INS is analyzed using this model. In addition, a parameter optimization design method of the vibration absorbing system is proposed. Through the optimization of the vibration absorber, the angular displacement of the INS decreases obviously, and the vibration coupling is suppressed effectively. Finally, the accuracy of the proposed optimization method is verified by vibration experiment, and it is also found that the heading and attitude measurement precision of the INS in the vibration process is improved after the optimization of the vibration absorber parameters.