靶准直器是惯性约束核聚变靶场中的重要部件, 其在靶室中的位姿是保证靶定位瞄准精度的主要因素之一。为了实现微米级的定位瞄准精度, 需要利用调整机构对靶准直器位姿进行调整。本文采取理论分析、有限元仿真和实验验证相结合的方法对靶准直器悬臂Y向调整机构的受力变形和稳定性进行了研究。根据对Y向调整机构的受力变形分析, 得到结构受力变形的理论关系式, 可从理论上优化Y向调整机构的刚度和稳定性; 基于有限元仿真对Y向调整机构进行相应约束条件下的稳定性分析和结构优化; 利用实验装置对靶准直器整体稳定性进行实验测试。实验结果表明: Y向调整机构优化后, 靶准直器静态Y向变形由原来的7.9 μm减小至小于2 μm, 动态稳定性满足系统2 μm/2 h的稳定性要求。同时, 试验、仿真和理论分析结果的变化趋势一致, 验证了理论和仿真分析的正确性。

The Target Alignment Sensor (TAS) was an important component of the Inertial Confinement nuclear Fusion (ICF) range, and its position in the target chamber was one of the main factors to ensure the accuracy of target positioning. In order to realize micro-level adjustment and positioning accuracy, it was necessary to use an appropriate mechanism to adjust the target alignment sensor. A method combining theoretical analysis, finite element simulation and experimental verification was adopted to study the deformation and stability of the y-adjusting mechanism. According to the stress deformation analysis of the y-adjusting mechanism, the theoretical relation of the structural stress deformation was obtained, and the stiffness and stability of the y-adjusting mechanism could be theoretically optimized. Deformation and stability analyses were conducted for the y-adjustment mechanism under certain constraints based on the finite element simulation. The experimental device was used to test the static stability of the target alignment sensor. The experimental results show that the y-deformation of the target alignment sensor is reduced from the original 7.9 μm to less than 2 μm, and the dynamic stability satisfies the stability requirement of 2 μm/2 h. The experimental results depicted the same trend as the theoretical and finite element deformation analyses, which demonstrates the correctness of the theoretical and simulation analyses.