轻量化惯导系统振动响应分析与减振器优化

惯导系统轻量化设计产生的结构柔性对其振动响应会产生不可忽略的影响。针对某型轻量化惯导结构,采用基于频响函数的子结构综合方法,建立了惯导系统的动力学模型,并应用此模型分析了IMU柔性对惯导系统的影响,并提出了一种减振系统参数优化设计方法。通过减振器优化,惯导系统的角位移明显减小,有效抑制了振动耦合。最后通过振动实验验证了优化方法的准确性,同时发现惯导系统经减振器参数优化后提高了振动过程中惯导系统航向和姿态测量精度。

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.