Non-uniform temperature field and effects of Shanghai 65 m radio telescope

QIAN Hong-liang; LIU Ye; FAN Feng; JIN Xiao-fei

doi:10.3788/OPE.20142204.0970

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Non-uniform temperature field and effects of Shanghai 65 m radio telescope

Micro/Nano Technology and Fine Mechanics | 更新时间：2020-08-13

- Non-uniform temperature field and effects of Shanghai 65 m radio telescope
- Optics and Precision Engineering Vol. 22, Issue 4, Pages: 970-978(2014)
- 作者机构：
  
  1. 哈尔滨工业大学(威海) 土木工程系,山东威海,264209
  2. 哈尔滨工业大学土木工程学院,黑龙江哈尔滨,150090
  3. 中国建筑股份有限公司技术中心北京,101300
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20142204.0970
  CLC： TH753.3
- Received：05 November 2013，
  
  Revised：20 January 2014，
  
  Published：25 April 2014
- 稿件说明：
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钱宏亮, 柳叶, 范峰等. 上海65m射电望远镜非均匀温度场及其效应[J]. 光学精密工程, 2014,22(4): 970-978

QIAN Hong-liang, LIU Ye, FAN Feng etc. Non-uniform temperature field and effects of Shanghai 65 m radio telescope[J]. Editorial Office of Optics and Precision Engineering, 2014,22(4): 970-978
钱宏亮, 柳叶, 范峰等. 上海65m射电望远镜非均匀温度场及其效应[J]. 光学精密工程, 2014,22(4): 970-978 DOI： 10.3788/OPE.20142204.0970.

QIAN Hong-liang, LIU Ye, FAN Feng etc. Non-uniform temperature field and effects of Shanghai 65 m radio telescope[J]. Editorial Office of Optics and Precision Engineering, 2014,22(4): 970-978 DOI： 10.3788/OPE.20142204.0970.

摘要

在最不利气候条件下（7月15日）研究了上海65 m射电望远镜的非均匀温度场及其效应，以掌握其主反射面面型精度在不同风速下受非均匀温度场的影响规律。研究了考虑构件尺寸效应的空气对流、天空辐射以及地面辐射等温度场关键影响因素的计算方法，并建立了温度场分析的有限元模型；对3种典型风速下的非均匀温度场进行分析，并将所得到的非均匀温度场施加到主反射面上，研究了不同风速下反射面精度受非均匀温度场的影响规律，即各节点实际坐标拟合抛物面误差均方根（RMS）随时间的变化规律。结果表明：在年平均风速3.2 m/s条件下，射电望远镜结构的RMS最大值为0.44 mm。当风速由1.0 m/s增大到10.0 m/s时，RMS最大值由0.56 mm减小到0.35 mm，且风速越大非均匀温度场对反射面精度的影响越小。该研究成果可为此类望远镜结构的温度场监测、传感器布设、以及热变形控制措施的选取提供参考信息。

Abstract

The non-uniform temperature field and correspond effects of Shanghai 65 m radio telescope were explored in detail on July 15th (one of the worst-case weather conditions) to understand the effect of non-uniform temperature field on the surface precision of main reflector under different wind speeds. By taking member's specific sizes into consideration

the calculation methods for key factors on temperature fields like convection heat transfer coefficient

sky radiation and ground radiation and so on were researched and an integral parametric thermal finite element model was established using thermal analysis module of ANSYS. The non-uniform temperature field was analyzed under three kinds of typical wind speeds. Temperature field results were loaded on main reflector to investigate the effect of non-uniform temperature field on surface precision caused by different wind speeds

which was assessed by the Root Mean Square(RMS) values of actual coordinates of each node fitting with an ideal parabolic main reflector. The results indicate that RMS led by thermal deformation can be up to 0.44 mm under a local annual average wind speed of 3.2 m/s. When the wind speed rises from 1.0 m/s to 10.0 m/s

the maximum RMS value falls from 0.56 mm to 0.35 mm and the higher the wind speed

the lower the RMS value. Research results can provide effective references for the temperature field monitoring

sensor arrangement and the thermal control selection of the telescopes.

关键词

Keywords

references

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