捷联惯导减振系统的耦合振动研究

目的研究耦合振动对捷联减振系统的影响。方法建立惯导减振系统动力学模型,并在有限元分析软件中对系统进行模态分析,然后通过扫频试验对比有无偏心情况下的响应。结果安装中心与弹性中心的不重合是导致线振动和角振动耦合的原因。结论对工程中减振器的安装提出了3个方面的要求,尽量保证弹性主轴与惯性主轴重合,避免偏心;增大安装半径,提高角振动与线振动频率比值;增加轴套等定位设备,增加寿命和精度。

Research on Coupled Vibration of Strapdown INS Damping System

Objective To study the effect of coupled vibration on the isolation system. Methods A dynamic modal of the isolation system was built, and a modal analysis of the isolation system was conducted with FEM software, and then frequency-sweep tests were used to find out the effects of mass eccentricity on the response of system. Results The misalignment of the installation center and the elastic center was the cause for the coupling of linear and angular vibrations. Conclusion Three demands were proposed on the shock absorber in engineering installation： to ensure the alignment of the elastic spindle and the principal axis of inertia to avoid eccentricity; to increase the installation radius and increase the ratio of the angle vibration and linear vibration frequency; and to increase the amount of axle sleeve positioning equipment to increase the accuracy and service life.