射电望远镜日照非均匀温度场试验研究

发布时间：2018-08-13 14:49

【摘要】：射电望远镜是人类探索宇宙的重要工具,为了实现更高的工作性能,射电望远镜正向大口径、高精度的趋势发展。受日照非均匀温度场的影响,射电望远镜反射面会产生不规则形变,严重影响射电望远镜的型面精度。因此本文将采用试验与数值模拟相结合的方法,对射电望远镜主、副反射面的日照温度场进行研究,为日后射电望远镜的设计建造及其精度控制提供参考。本文研究工作主要从下述4个方面展开:1、主反射面温度场试验研究对射电望远镜模型的主反射面进行日照非均匀温度场试验。为确保试验效果及试验数据的准确性本文对试验进行了详细设计,包括选择试验场地及仪器、确定试验工况、布置温度传感器等;根据16种工况的试验结果,对射电望远镜主反射面的温度场分布规律及时变规律进行研究。2、主反射面温度场试验模拟总结日照温度场分析计算方法,运用ANSYS有限元软件建立主反射面的数值模型;基于射电望远镜主反射面的日照温度场试验,对各试验工况进行全过程数值模拟;分析试验结果与模拟结果的误差率,评估射电望远镜温度场数值模拟方法的有效性。3、副反射面温度场试验研究根据射电望远镜副反射面“太阳灶”效应的形成原理设计副反射面日照温度场试验;分析试验结果研究副反射面温度场分布规律及“太阳灶”效应;对副反射面“太阳灶”效应试验进行数值模拟,通过对比试验结果与数值模拟结果,研究副反射面温度场的数值模拟方法。4、典型参数对温度场的影响射电望远镜日照非均匀温度场形成原因复杂、影响因素较多;本文对大气浑浊度、太阳辐射吸收率、板材厚度3个影响反射面温度场的关键因素进行参数分析,研究各参数对射电望远镜反射面日照温度场的影响规律。
[Abstract]:Radio telescope is an important tool for human beings to explore the universe. In order to achieve higher working performance, radio telescope is developing towards large aperture and high precision. Under the influence of the inhomogeneous temperature field of sunlight, the reflector of the radio telescope will produce irregular deformation, which seriously affects the accuracy of the shape plane of the radio telescope. Therefore, in this paper, the solar temperature field of the main and secondary reflectors of the radio telescope will be studied by means of the combination of experiment and numerical simulation, which will provide a reference for the design, construction and precision control of the radio telescope in the future. In this paper, the temperature field of the main reflector is studied from the following four aspects: 1: 1. The inhomogeneous temperature field of the main reflector of the radio telescope model is tested. In order to ensure the test effect and the accuracy of the test data, this paper designs the test in detail, including selecting the test site and instrument, determining the test condition, arranging the temperature sensor and so on, according to the test results of 16 kinds of working conditions, The temperature field distribution and time-varying law of the main reflector of radio telescope are studied. Secondly, the temperature field of the main reflector is simulated and the calculation method of sunshine temperature field is summarized, and the numerical model of the main reflector is established by using ANSYS finite element software. Based on the solar temperature field test of the main reflector of the radio telescope, the numerical simulation of the whole process of each test condition is carried out, and the error rate between the test results and the simulation results is analyzed. To evaluate the effectiveness of numerical simulation method for the temperature field of radio telescope, the temperature field test of the accessory reflector is designed according to the formation principle of the "solar stove" effect of the secondary reflector of the radio telescope. The distribution of temperature field and the effect of "solar stove" on the accessory reflector are studied by analyzing the experimental results, and the numerical simulation of the "solar stove" effect experiment on the accessory reflector is carried out, and the results are compared with the results of the numerical simulation. The influence of typical parameters on the temperature Field of Radio-Telescope is complicated and the influence factors are many. The atmospheric turbidity, solar radiation absorptivity, atmospheric turbidity, solar radiation absorptivity, atmospheric turbidity, solar radiation absorptivity, atmospheric turbidity, solar radiation absorptivity, atmospheric turbidity, solar radiation absorptivity, Three key factors affecting the temperature field of the reflector are analyzed and the influence of the parameters on the temperature field of the reflecting surface of the radio telescope is studied.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P111.44;TU317

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