加速度场下陀螺光纤环形变的影响分析

通过航天器大机动时直线加速场下陀螺光纤环的有限元分析，得出光纤环在加速场下的形变机理。基于各向异性复合材料理论，采用细观力学有限元方法，对光纤环代表性体积单元施加周期边界条件，分析得出光纤环的等效材料参数。再利用有限元程序ANSYS建立光纤环组件的空间有限元模型，施加加速度场，并建立接触单元分析形变过程中的结构接触耦合影响。分析结果表明:在加速场的作用下，光纤环形变的主要原因包括光纤环组件中的U型槽和顶盖形变后与光纤环的接触耦合作用，以及U型槽和顶盖结构的形变引起光纤环和光纤环本体结构的形变。

Analysis of influence of acceleration field on deformation of gyro fiber-optical ring

Through the finite element analysis of gyroscope fiber-optical ring under the linear acceleration field of spacecraft in large maneuvering motion, the deformation mechanism of the fiber-optical ring was obtained. Based on the theoretical knowledge of anisotropic materials, the micro-mechanics finite element method was used to apply periodic boundary conditions to the representative volume element (RVE) of the fiber-optical ring. Therefore, the equivalent material parameters of the fiber-optical ring were analyzed. The finite element program ANSYS was adopted to establish the spatial finite element model of the fiber-optical ring assembly and apply the acceleration field. The contact element was established to analyze the structural contact coupling effect during the deformation process. The analysis results show that the U-shaped structure and top cover of the fiber-optical ring assembly structure will contact with the fiber-optical ring after deformation under the action of acceleration field. In addition, the U-shaped structure and top cover structure will deform under the action of inertial force, which will affect the deformation of the fiber-optical ring.