大口径望远镜系统建模及仿真分析研究
发布时间：2018-07-21 10:35
【摘要】：随着各国对空间探测的不断深入,要求大口径望远镜的口径越来越大,分辨率越来越高,但同时带来了诸如主次镜支撑,视轴稳定,结构过于复杂等一系列问题。为了满足结构刚度和稳定性要求,保证系统精度的同时尽可能的减少结构重量,在设计阶段就必须借助于有限元法对望远镜全系统进行全面的动静态响应分析,使结构得到优化。 为了研究望大口径远镜系统级别的有限元仿真技术,本文概述了望远镜的发展,详细解释了有限元技术的概念,理论基础及各种动静态分析过程,总结了对望远镜进行系统级有限元分析的重要性以及国内外望远镜有限元分析现状。然后以某地平式地基光电望远镜为研究对象,采用理论分析,仿真模拟和试验验证等方法进行研究,具体内容包括: 针对该大口径地基光电望远镜,详细研究了其工作特点和各部件,子系统之间的连接关系,采用合理的有限元建模方法,建立了全系统详尽的有限元模型;对望远镜中的轴承和胶层连接,进行了理论分析,在理论分析基础上采用了合理的有限元模型进行描述,得到了合理的简化。 在建立起全系统的有限元模型之后,论文首先对望远镜的各重要部件,望远镜子系统以及整个系统进行了静力学分析,讨论了望远镜各重要部件在工作状态下的变形和应力情况,计算了望远镜系统在不同重力方向,以及静态风载荷作用下的主次镜离焦和偏移情况。对望远镜在各种工作状态下的装调工作做了一定的基础。 接下来对望远镜系统进行了动力学分析方面的工作。计算了望远镜的前十阶自然频率和模态阵型。对望远镜在工作中可能遭遇的动态载荷,主要是风载和地震波载荷进行了详细的论述,建立了载荷的数学模型,并采用随机响应的方法进行分析,得出了望远镜在各种载荷频率下的响应情况。对望远镜的控制起到了一定的作用。 介绍了望远镜灵敏度分析的概念,做了望远镜部件对其各参数的灵敏度分析以及望远镜系统对各部件的灵敏度分析,得出了各部件对望远镜主次镜相对位移变化等参数的影响程度。
[Abstract]:With the deepening of space exploration, large aperture telescopes are required to have larger aperture and higher resolution, but at the same time, it brings a series of problems such as primary and secondary mirror support, stable visual axis, complex structure and so on. In order to meet the requirements of structural stiffness and stability, and to ensure the accuracy of the system and reduce the weight of the structure as much as possible, it is necessary to make a comprehensive dynamic and dynamic response analysis of the whole telescope system by means of finite element method in the design stage. Optimize the structure. In order to study the finite element simulation technology of telescopes, this paper summarizes the development of telescopes, explains in detail the concept, theoretical basis and various dynamic and static analysis processes of the finite element technique. The importance of systematic finite element analysis for telescopes and the present situation of finite element analysis of telescopes at home and abroad are summarized. Then taking the flat ground photoelectric telescope as the research object, using the methods of theoretical analysis, simulation and experimental verification, the specific contents include: aiming at the large caliber foundation photoelectric telescope, The characteristics of the system and the connection relationship between the components and subsystems are studied in detail. The detailed finite element model of the whole system is established by using the reasonable finite element modeling method, and the theoretical analysis of the connection between the bearing and the rubber layer in the telescope is carried out. On the basis of theoretical analysis, a reasonable finite element model is used to describe, and a reasonable simplification is obtained. After the finite element model of the whole system has been established, the main components of the telescope, the telescope subsystem and the whole system are analyzed statically. The deformation and stress of the important components of the telescope in the working state are discussed. The defocusing and migration of the primary and secondary mirror under the action of static wind load and different gravity direction of the telescope system are calculated. The installation of telescopes in various working states is based on. Then the dynamic analysis of the telescope system is carried out. The first ten natural frequencies and modal formations of the telescope are calculated. In this paper, the possible dynamic loads encountered by telescopes in work, mainly wind load and seismic wave load, are discussed in detail, the mathematical model of the load is established, and the random response method is used to analyze the dynamic load. The response of the telescope under various load frequencies is obtained. It has played a certain role in the control of the telescope. The concept of sensitivity analysis of telescope is introduced, the sensitivity analysis of telescope components to its parameters and the sensitivity analysis of telescope system to each component are made. The influence of the components on the relative displacement of the telescope primary and secondary mirror is obtained.
【学位授予单位】：中国科学院研究生院（长春光学精密机械与物理研究所）
【学位级别】：博士
【学位授予年份】：2011
【分类号】：TH751
本文编号：2135245
[Abstract]:With the deepening of space exploration, large aperture telescopes are required to have larger aperture and higher resolution, but at the same time, it brings a series of problems such as primary and secondary mirror support, stable visual axis, complex structure and so on. In order to meet the requirements of structural stiffness and stability, and to ensure the accuracy of the system and reduce the weight of the structure as much as possible, it is necessary to make a comprehensive dynamic and dynamic response analysis of the whole telescope system by means of finite element method in the design stage. Optimize the structure. In order to study the finite element simulation technology of telescopes, this paper summarizes the development of telescopes, explains in detail the concept, theoretical basis and various dynamic and static analysis processes of the finite element technique. The importance of systematic finite element analysis for telescopes and the present situation of finite element analysis of telescopes at home and abroad are summarized. Then taking the flat ground photoelectric telescope as the research object, using the methods of theoretical analysis, simulation and experimental verification, the specific contents include: aiming at the large caliber foundation photoelectric telescope, The characteristics of the system and the connection relationship between the components and subsystems are studied in detail. The detailed finite element model of the whole system is established by using the reasonable finite element modeling method, and the theoretical analysis of the connection between the bearing and the rubber layer in the telescope is carried out. On the basis of theoretical analysis, a reasonable finite element model is used to describe, and a reasonable simplification is obtained. After the finite element model of the whole system has been established, the main components of the telescope, the telescope subsystem and the whole system are analyzed statically. The deformation and stress of the important components of the telescope in the working state are discussed. The defocusing and migration of the primary and secondary mirror under the action of static wind load and different gravity direction of the telescope system are calculated. The installation of telescopes in various working states is based on. Then the dynamic analysis of the telescope system is carried out. The first ten natural frequencies and modal formations of the telescope are calculated. In this paper, the possible dynamic loads encountered by telescopes in work, mainly wind load and seismic wave load, are discussed in detail, the mathematical model of the load is established, and the random response method is used to analyze the dynamic load. The response of the telescope under various load frequencies is obtained. It has played a certain role in the control of the telescope. The concept of sensitivity analysis of telescope is introduced, the sensitivity analysis of telescope components to its parameters and the sensitivity analysis of telescope system to each component are made. The influence of the components on the relative displacement of the telescope primary and secondary mirror is obtained.
【学位授予单位】：中国科学院研究生院（长春光学精密机械与物理研究所）
【学位级别】：博士
【学位授予年份】：2011
【分类号】：TH751
【引证文献】
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3 廖宏宇;风载对大口径光电望远镜跟踪误差的影响分析[D];中国科学院研究生院（光电技术研究所）;2014年
，本文编号：2135245
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