【作者】 李占辉；

【导师】 王建设；

【作者基本信息】 长春理工大学 ， 机械设计及理论， 2008， 硕士

【摘要】 在光学遥感器光机结构设计过程中,为缩短设计周期、减少成本,一般采用有限元分析技术对结构进行仿真分析。本文基于有限元基本理论,利用有限元分析软件(ANSYS),对遥感器主镜面形和光机结构性能进行仿真分析。论文阐述了现代光机系统分析方法以及一般过程,总结了遥感器在运载、工作过程中经历的力学环境和热环境,并确定了系统响应的评价指标。应用ANSYS建立了适用于本文仿真分析的有限元模型。分析了主镜在微重力、温度和热力耦合三种工况下的面形精度,利用最小二乘法原理拟合变形镜面,计算出变形镜面的PV值和RMS值,并编写了Matlab数据处理程序。针对遥感器主要经历的动力学环境,对遥感器光机结构分别做了模态、正弦扫频、PSD随机振动和冲击响应分析。从动态环境角度研究和考察遥感器经受各种动力学环境的能力。从仿真结果数据可知,本文中的遥感器光机结构设计方案具有足够的强度和刚度,说明了本文设计方案合理可行。同时,仿真结果也为选取合理的设计参数、结构方案的进一步优化和热控提供了科学依据,为后续的动力学环境试验提供有效的指导。更多还原

【Abstract】 A method of simulation was always adopted in the course of optical remote sensor structure design in order to shorten design cycle and reduce costs. This paper designed a simulation analysis about optical remote sensor structure, which make use of finite element software (ANSYS) based on finite element basic theory, and verified the scheme that was feasible and reasonable. This paper introduced the analysis method and ordinary course of modern optical-mechanical system, and summarized mechanics and thermal environment where the remote sensor undergo in the course of carrying and work, and confirmed the evaluation index of system response. A finite element model which applied to simulation analysis in this paper was built with ANSYS software.The primary mirror was a major component in optical system, which demanded high face form precision. This paper analyzed the primary mirror deformation in three different working conditions, such as micro-gravity experiment, temperature and heating-mechanic coupling. And then the author write MATLAB program which be used to process data of face form node deformation, and calculate the deformed surface mirror values of PV and RMS. A series of analysis was done, such as Modal, Harmonic, Transient and Spectrum, which be aimed at the remote sensor opt-mechanical structure on the basis of experiment load data. These response data that were obtained from the model action on a variety of load are analyzed, which could study and observe the ability of remote sensor that undergo various dynamics environment from the view of dynamic environment, and the design scheme was evaluated from structure performance.The simulation results indicated that the structure design scheme of remote sensor had adequate intensity and rigidity, and each index was within the limits of permission, and it was clear that the scheme of this paper was reasonable and feasible. In the meantime, the results provided a scientific foundation that could choose reasonable design parameters and structure scheme for further optimization and thermal control.更多还原