發(fā)布時間：2018-11-20 09:26

【摘要】：當今,隨著國內外在深空探測、雷達通訊、射電天文等眾多領域的發(fā)展和深化,作為重要基礎裝備之一,大型反射面天線的口徑越來越大,工作頻段越來越高,從而,使得太陽熱輻射對大型反射面天線性能的產生了越來越顯著的影響,其中所帶來的機電耦合問題尤為突出,使得人們在天線設計與補償工作中迎接了越來越多的挑戰(zhàn)。對此,本文對大型反射面天線在太陽輻射影響下的多場耦合與補償問題進行了分析與研究,完成的主要工作如下:1.針對太陽輻射對大型反射面天線的影響,根據天體運動和地理信息,提出了面向大型反射面天線的太陽入射角計算方法。算例結果表明,根據已知的地理信息、時間信息和天線姿態(tài)信息,可以通過本文方法得到某天針對大型面天線的太陽入射角的變化曲線,并實時得到當前的太陽照射天線主面的太陽入射角結果。2.基于太陽入射角計算方法,提出了改進的大型反射面天線機電熱耦合分析方法,使多物理場間復雜的分析模型與分析數據的匹配和傳遞問題得到簡化,降低了大型及超大型反射面天線的機電熱多場耦合的解算規(guī)模,提高了分析效率�；诖�,可快速準確地對大型反射面天線進行了太陽熱輻射分析、熱變形分析以及電性能分析,并通過對得到的不同太陽入射角下的天線主面與背架的溫度場云圖和溫度變化線、天線主面位移場云圖和位移變化曲線,以及天線方向圖和電性能分析曲線的分析,得出不同太陽入射角下的太陽熱輻射對大型反射面天線的影響規(guī)律。3.通過對不同太陽入射角下的反射面天線熱輻射問題的分析,提出了基于太陽入射角的大型反射面天線太陽輻射溫度場快速計算方法,并結合大型反射面天線機電耦合理論思想,基于C++Builder環(huán)境自主開發(fā)面向大型面天線的太陽輻射影響耦合分析軟件,簡化了太陽照射下的大型反射面天線機電熱多場耦合分析,并提高了分析效率。4.基于機電耦合理論,結合主動面板補償技術,提出了一種大型反射面天線主反射面的主動面板補償量計算方法,可針對天線受太陽照射導致的主面變形,對其主面偏差做出計算,并得到反饋給作動器的實際補償量。其次,建立了針對變形賦形天線主動反射面補償的機電耦合模型,并據此提出了基于機電耦合的主動反射面電性能補償效果的檢驗方法。通過與電磁分析軟件FEKO實體建模仿真的結果進行比較,驗證了耦合模型的準確性和有效性。仿真實例也表明,本文得到的補償量施加到變形反射面天線上后可以有效提升天線主面精度,從而降低副瓣電平,并提高指向精度,有效改善了天線電性能。
[Abstract]:Nowadays, with the development and deepening of many fields, such as deep space exploration, radar communication, radio astronomy and so on, as one of the important basic equipment, the aperture of large reflector antenna is becoming larger and larger, and the working frequency band is becoming higher and higher. Solar thermal radiation has a more and more significant effect on the performance of large reflector antenna, especially the electromechanical coupling problem, which makes people meet more and more challenges in antenna design and compensation. In this paper, the multi-field coupling and compensation problem of large reflector antenna under the influence of solar radiation is analyzed and studied. The main work is as follows: 1. In view of the influence of solar radiation on large reflector antennas, based on the motion of celestial bodies and geographical information, a calculation method of solar incident angle for large reflector antennas is proposed. The numerical results show that according to the known geographic information, time information and antenna attitude information, the curve of solar incident angle can be obtained by the method in this paper. The results of the solar incident angle on the main plane of the current solar irradiating antenna are obtained in real time. 2. 2. Based on the calculation method of solar incident angle, an improved electromechanical and thermal coupling analysis method for large reflector antenna is proposed, which simplifies the problem of matching and transferring the complex analysis model between multi-physical fields and the analytical data. The calculation scale of electromechanical thermal multifield coupling of large and super large reflector antennas is reduced, and the efficiency of analysis is improved. Based on this, the solar thermal radiation analysis, thermal deformation analysis and electrical performance analysis of large reflector antenna can be carried out quickly and accurately. Through the analysis of the temperature field cloud diagram and temperature change line of antenna main plane and back frame under different solar incident angles, the displacement field cloud diagram and displacement curve of antenna main plane, and the antenna pattern and electric performance analysis curve, the paper analyzes the temperature field cloud diagram and temperature change line of antenna main plane and back frame, as well as the analysis of antenna pattern and electric performance analysis curve. The influence of solar thermal radiation on large reflector antenna at different solar incident angles is obtained. Based on the analysis of the thermal radiation of reflector antenna at different solar incident angles, a fast calculation method for solar radiation temperature field of large reflector antenna based on solar incident angle is proposed, and combined with the theory of electromechanical coupling of large reflector antenna. Based on C Builder environment, the coupling analysis software of solar radiation effect for large-scale antenna is developed, which simplifies the electromechanical multi-field coupling analysis of large reflector antenna under solar irradiation, and improves the efficiency of analysis. Based on the electromechanical coupling theory and the active panel compensation technology, a method for calculating the compensation amount of the main reflector of a large reflector antenna is presented, which can be applied to the deformation of the main plane caused by solar radiation. The deviation of the main plane is calculated and the actual compensation quantity feedback to the actuator is obtained. Secondly, an electromechanical coupling model for active reflector compensation of deformed shaped antenna is established, and a test method for the compensation effect of active reflector based on electromechanical coupling is proposed. The accuracy and validity of the coupled model are verified by comparing the results with the electromagnetic analysis software FEKO solid modeling and simulation. The simulation example also shows that the compensation amount obtained in this paper can effectively improve the accuracy of the main plane of the antenna after it is applied to the deformed reflector antenna, thus reducing the sidelobe level, improving the pointing accuracy and effectively improving the electrical performance of the antenna.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN823.27

【引證文獻】

相關會議論文 前1條

1 宋建波;劉宏;王文俊;向喜瓊;;大射電望遠鏡貴州選址項目簡介及研究進展[A];貴州省巖石力學與工程學會2010年學術年會論文集[C];2010年

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本文編號：2344532