神光Ⅱ升级装置真空靶室系统随机振动仿真分析  

The Random Vibration Simulation Analysis and Optimization Design of Vacuum Target Chamber System in SGII Upgrading Laser Facility

作　　者：白彦伟 李鹏 王瑾 乔战峰[2] 

机构地区：[1]上海航天设备制造总厂,上海200245 [2]中国科学院上海光学精密机械研究所,上海201800

出　　处：《机械设计与制造》2014年第10期209-212,共4页Machinery Design & Manufacture

基　　金：上海航天工艺与装备工程技术研究中心(13DZ2280700);国家863高技术研究发展计划资助项目(2007AA804217)

摘　　要：真空靶室系统是神光Ⅱ升级装置高功率激光束打靶实验的场所。通过welch法对真空靶室系统激励源的振动样本进行无偏估计,得出功率谱密度估计作为随机振动分析的输入。同时,对真空靶室的有限元建模、约束处理作了分析与探讨,在此基础上就真空靶室系统进行了模态和振动响应分析,得到了真空靶室系统前三十阶振动频率、振型和位移响应时间历程。该结果对真空靶室设计中如何满足真空靶室系统光学组件镜面稳定性最大允许误差5μrad的要求及限制真空靶室在实验时过大动变形的产生有实际意义。工程结果表明,光学组件镜面稳定性误差1.84μrad,满足总体要求。Vacuum target chamber system in SG Ⅱ upgrading laser facility is the place of high power laser beam shooting experiment. It carries on the unbiased estimation through the Welch method to the excitation source of the vacuum target chamber system, and gets the power spectral density estimation as the random vibration simulation input. A finite element model and its boundary conditions of vacuum target chamber are also established. The first thirty natural frequencies, the corresponding mode shapes and time-history of displacement response are given based on the analysis of the modes and dynamic response of this vacuum target chamber system The calculation and analysis above is helpful for meeting the maximum permissible error of 5 grad requirement and for keeping the oversize dynamic deformation under restraint, which is applied to design the vacuum target chamber system. The engineering results show that the stability error of optical component suoCaee is 1.841zrad, which meet the general requirements.

关 键 词：真空靶室 随机振动 WELCH法 仿真分析 

分 类 号：TH16[机械工程—机械制造及自动化] TH212