跟踪望远镜机架的热结构分析
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摘要
为了研究极端温度环境对跟踪望远镜指向精度的影响,利用ANSYS Workbench有限元分析软件,建立跟踪望远镜机架的有限元模型,通过稳态热分析,得到高、低温环境中机架在太阳辐射、空气对流、电器件产热及热传导作用下的温度场分布;通过结构静力学分析,得到机架在以上温度场作用下的热变形。分析结果表明在高、低温工况下,机架轴系的偏斜角均小于30″,在误差允许范围内。极端温度环境中跟踪望远镜机架的方位转轴、俯仰转轴及光路视准轴基本没有发生偏斜,跟踪望远镜的指向精度几乎没有受到影响。
In order to study the effect of extreme temperature environment on pointing accuracy of tracking telescope,the finite element analysis software ANSYS Workbench is used to establish finite element model of tracking telescope frame.By steady-state thermal analysis,the temperature field distribution of frame is obtained under the action of solar radiation,air convection,heat generation of electric device,and heat conduction in high and low temperature environment,while the thermal deformation of frame under the action of the corresponding temperature field is obtained by static structural analysis.The results show that the slant angle of the frame set of axes are all less than 30″ under high and low temperature working condition,which is within the allowable error range.It is indicated that the azimuthal rotating axis,pitching rotating axis and collimation axis of tracking telescope frame do not deflect basically,and pointing accuracy of tracking telescope is almost unaffected in extreme temperature environment.
In order to study the effect of extreme temperature environment on pointing accuracy of tracking telescope,the finite element analysis software ANSYS Workbench is used to establish finite element model of tracking telescope frame.By steady-state thermal analysis,the temperature field distribution of frame is obtained under the action of solar radiation,air convection,heat generation of electric device,and heat conduction in high and low temperature environment,while the thermal deformation of frame under the action of the corresponding temperature field is obtained by static structural analysis.The results show that the slant angle of the frame set of axes are all less than 30″ under high and low temperature working condition,which is within the allowable error range.It is indicated that the azimuthal rotating axis,pitching rotating axis and collimation axis of tracking telescope frame do not deflect basically,and pointing accuracy of tracking telescope is almost unaffected in extreme temperature environment.
引文
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[2]Guo Liang,et al. Thermal analysis and verification of CCD components in spectral imagers at steady and transient states[J].Optics and Precision Engineering(光学精密工程),2010,18(11):2375-2383(in Chinese).
[3]Wang Fei.Study on 120T Electroslag Furnace Arm's Combined Heat Transfer Temperature Field(120T电渣炉支臂的复合换热温度场的研究)[D].Shenyang:Master Thesis of Northeastern University,2011:18-19(in Chinese).
[4]Yang Shiming,Tao Wenshuan.Heat Transfer(传热学)[M].Beijing:Higher Education Press,2006:4-11(in Chinese).
[5]Jin Xiaofei,et al.Effect of non-uniform temperature field under sunshine on the structure supporting the reflector of a large radio telescope-FAST[J].China Civil Engineering Journal(土木工程学报),2008,41(11):71-77(in Chinese).
[6]Shi Yaohui.Research on Pointing Accuracy Stability of Vehicle-borne Photo-electronic Theodolite(车载光电经纬仪指向精度稳定性研究)[D].Chengdu:Master thesis of Institute of Optics and Electrics,Chinses Academy of Sciences,2014:39-41(in Chinese).
[7]Chen Zhihua,et al.Experimental research on solar radiation absorptance of commonly uesd coatings for steel structures[J].Journal of Building Structures(建筑结构学报),2014,35(5):81-87(in Chinese).
[8]Guo Liang,et al.Thermal design and simulation analysis of electronic controlling cabinet in space camera[J].Chinese Optics(中国光学),2011,4(2):129-138(in Chinese).
[9]Xu Jingjin.ANSYS Workbench Engineering Project Detailed Annotation(ANSYS Workbench工程实例详解)[M].Beijing:Posts&Telecom Press,2015:280-283(in Chinese).