面向大型面天线的太阳辐射影响耦合分析与补偿
发布时间：2018-11-20 09:26
【摘要】：当今,随着国内外在深空探测、雷达通讯、射电天文等众多领域的发展和深化,作为重要基础装备之一,大型反射面天线的口径越来越大,工作频段越来越高,从而,使得太阳热辐射对大型反射面天线性能的产生了越来越显著的影响,其中所带来的机电耦合问题尤为突出,使得人们在天线设计与补偿工作中迎接了越来越多的挑战。对此,本文对大型反射面天线在太阳辐射影响下的多场耦合与补偿问题进行了分析与研究,完成的主要工作如下:1.针对太阳辐射对大型反射面天线的影响,根据天体运动和地理信息,提出了面向大型反射面天线的太阳入射角计算方法。算例结果表明,根据已知的地理信息、时间信息和天线姿态信息,可以通过本文方法得到某天针对大型面天线的太阳入射角的变化曲线,并实时得到当前的太阳照射天线主面的太阳入射角结果。2.基于太阳入射角计算方法,提出了改进的大型反射面天线机电热耦合分析方法,使多物理场间复杂的分析模型与分析数据的匹配和传递问题得到简化,降低了大型及超大型反射面天线的机电热多场耦合的解算规模,提高了分析效率。基于此,可快速准确地对大型反射面天线进行了太阳热辐射分析、热变形分析以及电性能分析,并通过对得到的不同太阳入射角下的天线主面与背架的温度场云图和温度变化线、天线主面位移场云图和位移变化曲线,以及天线方向图和电性能分析曲线的分析,得出不同太阳入射角下的太阳热辐射对大型反射面天线的影响规律。3.通过对不同太阳入射角下的反射面天线热辐射问题的分析,提出了基于太阳入射角的大型反射面天线太阳辐射温度场快速计算方法,并结合大型反射面天线机电耦合理论思想,基于C++Builder环境自主开发面向大型面天线的太阳辐射影响耦合分析软件,简化了太阳照射下的大型反射面天线机电热多场耦合分析,并提高了分析效率。4.基于机电耦合理论,结合主动面板补偿技术,提出了一种大型反射面天线主反射面的主动面板补偿量计算方法,可针对天线受太阳照射导致的主面变形,对其主面偏差做出计算,并得到反馈给作动器的实际补偿量。其次,建立了针对变形赋形天线主动反射面补偿的机电耦合模型,并据此提出了基于机电耦合的主动反射面电性能补偿效果的检验方法。通过与电磁分析软件FEKO实体建模仿真的结果进行比较,验证了耦合模型的准确性和有效性。仿真实例也表明,本文得到的补偿量施加到变形反射面天线上后可以有效提升天线主面精度,从而降低副瓣电平,并提高指向精度,有效改善了天线电性能。
[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.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN823.27
本文编号：2344532
[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.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN823.27
【引证文献】
相关会议论文 前1条
1 宋建波;刘宏;王文俊;向喜琼;;大射电望远镜贵州选址项目简介及研究进展[A];贵州省岩石力学与工程学会2010年学术年会论文集[C];2010年
，本文编号：2344532
本文链接：https://www.wllwen.com/kejilunwen/wltx/2344532.html
