靶镜姿态调整机构三角支承受力和变形研究  

Study on force and deformation of triangle support structure for adjusting target-lens orientation

作　　者：章亚男[1] 朱寒雨[1] 沈卫星[2] 陈明仪[1] 

机构地区：[1]上海大学机电工程与自动化学院,上海200072 [2]中国科学院上海光学精密机械研究所,上海201800

出　　处：《仪器仪表学报》2011年第3期646-653,共8页Chinese Journal of Scientific Instrument

基　　金：863计划项目(2007AA804229-1);上海市教委"机械电子工程"创新团队项目资助

摘　　要：终端光学组件中的靶镜姿态是保证激光打靶精度的主要因素之一,为了实现微米级的打靶精度,需要利用调焦模块中的调平机构对靶镜姿态进行调节。针对终端光学组件在靶球上倾斜安装的实际情况(±45°),对三顶三拉调平机构在等腰三角形支承布局下的螺栓组进行了受力分析,得到归一化等效拉力与特征尺寸比值的关系方程和关系图线;利用ANSYS软件对调平结构和调节平板进行了相应约束下的变形分析;利用星点检验法对实际研制的调焦模块进行了星点图检验。结果表明,特征尺寸比值H/l1存在一个特定的数值1/2,它区分了螺栓组的顶、拉主导性变化;从变形角度正立等腰三角形布局和倒置等腰三角形布局对应适合于上半球和下半球上的安装情况;星点检验结果证实了终端光学组件中的调平机构设计可以保证靶镜的变形引起的影响在允许的范围之内。The orientation of the target lens in Final Optics Assembly（FOA） is one of the key factors for ensuring laser targeting accuracy,which is adjusted by a leveling mechanism of the focusing module.Aiming at the situation that the installation angle of FOA on the target ball is ±45°,the force analysis of adjusting bolt-set is carried out for a three-pod leveling mechanism under isosceles triangle configuration.The relationship formulae and graphs of the normalized effective pulling forces with respect to specific length ratios are obtained.Deformation analyses are conducted for the leveling mechanism and for the adjusting plate under certain constraints.Employing star-point testing method,a real focusing module prototype is verified.Results show that,there exists a special value of 1/2 for the specific length ratio H/l1,which is the changing point from pulling-force-dominant phase to pushing-force-dominant phase for the adjusting bolt-sets.From the viewpoint of deformation of the leveling mechanism,normal isosceles triangle configuration is suitable for FOA installation on the upper half sphere of the target ball,and inverted isosceles triangle configuration is suitable for FOA installation on the lower half sphere.Star-spot test results prove that the design of the leveling mechanism for FOA can assure the influence caused by the deformation of the target lens be limited within the permitted range.

关 键 词：调平机构 受力分析 变形 支承分布 

分 类 号：TH703[机械工程—仪器科学与技术]