| 题名 | 高功率激光驱动器中若干关键器件及部分系统稳定性分析研究 |
| 作者 | 曾台英 |
| 学位类别 | 博士 |
| 答辩日期 | 2007 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 朱健强 |
| 关键词 | 高功率激光装置 稳定性 动态误差 有限元分析 结构耦合 |
| 其他题名 | Stability analysis for some key elements and systems on high power laser driver in ICF |
| 中文摘要 | 激光惯性约束核聚变（Inertial Confinement Fusion，简称ICF）是当今国际的前沿研究领域，对于开拓新能源有着极其深远的科学研究意义和应用价值。新一代ICF高功率激光驱动装置是一个大型复杂的精密光学机械系统，为了实现精确打靶，对关键器件及组成的光学机械系统的稳定性提出严格的要求，从而以保证整个装置有高稳定性的工作支撑平台。 考虑到结构系统因外界激励引起的漂移产生的误差是影响稳定性能的主要因素，所以对稳定性的研究，一方面在结构设计上，必须明确稳定性设计参数，从结构特征上实现稳定性能的最优化设计；另一方面要确定误差在光路中的传递关系。基于上述阐述，寻求一种有效的稳定性误差分析方法及如何有效提高结构的稳定性能是展开稳定性研究的亟待解决问题。本论文主要从光学元件的动态误差分析方法和结构稳定性两方面出发，综合研究了单元器件及组成系统中稳定性的控制、误差的传递。通过数值模拟计算，分别对系统的单元结构进行稳定性控制的动态特性分析，并且对典型的光学元件系统进行稳定性误差分析，总结一种适用于装置总体稳定性分析的方法。 首先本文结合系统的工作特点，提出了一种基于空间和时间的光学元件的稳定性误差分析方法，给出误差传递模型。在模型中，对光学元件误差之间的相关性进行推导与论述，进一步给出系统中空间状态误差对靶场光束指向精度的耦合影响，并且对系统的动态误差进行了考虑。最后针对误差传递模型中的各项误差给出数值实现方法。 其次本文基于理想刚体的设计目标，从随机振动理论出发，确定结构稳定性的控制参数。以SF1空间滤波器为例，对单元结构进行相关的稳定性优化设计分析和动态特性研究。对基础支撑结构的动态特性、管道的支撑优化设计及其弹性连接进行相关的论证和分析。 最后结合误差分析方法和结构稳定性的控制，对典型光学元件的支撑耦合系统进行稳定性误差分析。首先对SF1空间滤波器系统为例进行稳定性分析。通过对耦合结构的动态特性分析，明确结构动态性能。在误差计算上，从是否考虑光学元件之间相关性而得到的误差值的相互比较，得出误差分析时光学元件的相关性对最终误差的重要影响。同时通过对动态误差的分析，得出整个系统的误差变化情况，并且统计分析了动态误差的分布规律。 文中还对大口径反射镜桁架系统进行了稳定性研究。针对系统的结构特征首先研究了大口径反射镜架和桁架的动态性能。进一步分析了系统稳定性，总结误差变化特征。通过成功地对光学机械系统进行稳定性误差分析的结果表明，采用文中所提出的基于空间和时间的动态误差分析方法，能补充光学元件之间的误差传递关系，并且能进一步反映系统的工作时间内的误差的动态变化情况。基于上述典型系统稳定性分析的基础上，总结了装置总体稳定性分析的方法。 本论文的工作为ICF装置结构稳定性研究提供了一种有效的分析手段，并首次将光学元件及系统的耦合影响考虑到稳定性误差分析中，所得的结果对于ICF装置中结构稳定性设计有着直接的参考意义。这种稳定性分析方法为ICF高功率激光驱动器的结构设计提供了更为可靠的分析手段，对于工程结构设计的优化以及系统的精密化有重要的实际意义。 |
| 英文摘要 | Inertial confinement fusion (ICF) is a frontier research field today, which has important significance and practical value in developing new energy resources in future. The new generation high power laser driver in ICF is a large, complicated and fine opto-mechanical system. In order to satisfy the main laser beam accurately positioned, the key elements and systems should be required having a high precision, and even more having a high stability before and during a shot to provide a stable platform for the optical elements and alignment process. Considering that the error from structure drift induced by the ambient vibration is the main influence on system stability. To stability research, on the one hand, the stability design parameter should be confirmed to fulfill optimization design, and on the other hand, the error transfer in beam path should be found. Base on above-mentioned, seeking an effective stability error analysis method and how to improve the stability of structure are questions of stability study which need to be solved. This article arms at the researches on stability the opto-mechanical system combining dynamic error analysis method of optical element and structure stability to carry out the system structure stability control and error transmit. Through the numerical simulation, the dynamic analysis of structure elements and error analysis of typical system were carried out, and the estimate was put forward for the stability of system. Firstly, a method of error analysis for optical elements based on the spatial and timporal stability was put forward combining with the working characteristics of system, and the error transfer model of this method was also provided. The relativity of the errors of the optical elements in this model demonstrated and deduced, and the effect of beam path coupling to beam position error on target were discussed. Furthermore, the dynamic error was also considered in this model. The numerical simulation methods to all kinds of error were presented. Secondly, based on fundamental theory of random vibration, the parameters to control structure stability were confirmed. The analysis of optimal design on stability and dynamical character was developed for spatial filter and its composing cell. Numerical simulations were carried out about base support structure, optimal design of tube support and elastic connection. Finally, error analysis of typical coupling system was carried out to combing with the method of error analysis and structure control which were discussed above. The error analysis of SF1 spatial filter system as typical system of lens was carried out and the results proved that the compensation error which reflected relativity of optical element account for a significant part in error. As well as, the change of error was showed from dynamic and the distribution of dynamic error also was revealed by using statistical method. The error analysis of large aperture mirror support system as typical system about mirror was also investigated. The dynamic performance of mirror support and truss were researched at firstly, furthermore the error of the system was analyzed and the change was generalized. The results about stability of opto-mechanical system showed that the error analysis method mentioned in article can compensate error transmit of optical element and show the dynamic change of error in work time. From the results of typical systems, a method of stability analysis of whole facility was summarized. The research work provided a more effectively analysis method to deal with the error of the target position induced by the system structure, and firstly took optical element and system coupling into account error analysis. The results have direct guidance on the structure stability design of the ICF facility. This analytical method provides a more reliable means to structure stability design, and has a higher application value in the structural optimization and system precision updating. |
| 语种 | 中文 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/15607]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 曾台英. 高功率激光驱动器中若干关键器件及部分系统稳定性分析研究[D]. 中国科学院上海光学精密机械研究所. 2007. |
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