發(fā)布時間：2018-05-29 04:15

  本文選題：地基反射面天線 + 溫度場�。� 參考：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：隨著科學(xué)技術(shù)的快速發(fā)展,大口徑地基反射面天線在航空航天和現(xiàn)代通訊等領(lǐng)域使用越來越廣泛,隨著對天線的性能要求越來越高,其口徑也隨之越來越大,太陽輻射溫度場產(chǎn)生的熱變形對天線電性能的影響也與日俱增。故而,對地基天線結(jié)構(gòu)溫度分布的研究在工程中是很有價值的。由于太陽輻射溫度場是非常復(fù)雜的,而且影響因素眾多,所以要用實驗、仿真及其相結(jié)合的方法進(jìn)行大量的研究。本文便是針對實驗天線及實際工程中的天線,搭建溫度及環(huán)境風(fēng)速風(fēng)向測量平臺,再結(jié)合仿真計算,對測試系統(tǒng)的搭建過程及天線結(jié)構(gòu)溫度場進(jìn)行研究。首先針對某7.3m實驗天線,搭建一套能夠?qū)崟r監(jiān)測天線結(jié)構(gòu)溫度的測試系統(tǒng),并著重對傳感器的選擇和傳感器接線方法以及這套測試系統(tǒng)測量過程中產(chǎn)生誤差的原因和對這些誤差的修正補(bǔ)償方法進(jìn)行研究,提出改進(jìn)意見和測量誤差的修正算法,然后用該測試系統(tǒng)對該天線進(jìn)行長時間不間斷的監(jiān)測,在一年多的測量數(shù)據(jù)中找出極端高溫、極端低溫和最大溫度梯度這三種極端工況,并對極端工況的預(yù)測方法提出改進(jìn)意見。其次推廣在7.3m實驗天線上搭建的測試平臺,將其運用到實際工程中,在某35m天線上搭建測試平臺,并建立該天線的模型,確定仿真邊界條件,對該天線進(jìn)行多個工況下的仿真與實驗分析,根據(jù)分析結(jié)果進(jìn)一步分析產(chǎn)生誤差的原因。最后借助單片機(jī)及Lab VIEW、SQL SERVER等軟件工具,開發(fā)一套能夠?qū)崟r測量天線所在環(huán)境風(fēng)速風(fēng)向的測量系統(tǒng),然后通過長時間不間斷的測量,尋求該地區(qū)風(fēng)的規(guī)律,并對風(fēng)速對天線結(jié)構(gòu)溫度梯度的影響進(jìn)行初步研究。
[Abstract]:With the rapid development of science and technology, large-caliber ground-based reflector antenna is more and more widely used in the fields of aerospace and modern communication. The influence of thermal deformation caused by solar radiation temperature field on the electrical properties of antenna is also increasing. Therefore, it is very valuable to study the temperature distribution of the ground antenna structure. Because the temperature field of solar radiation is very complicated and there are many factors affecting it, a lot of research should be done by means of experiment, simulation and its combination. In this paper, the temperature and wind velocity and wind direction measurement platform is built for the experimental antenna and the antenna in the actual engineering. Then, the process of the test system and the temperature field of the antenna structure are studied in combination with the simulation calculation. For a 7.3m experimental antenna, a testing system is built to monitor the temperature of antenna structure in real time. In addition, the selection of sensors, the connection method of sensors, the causes of errors in the measurement process of the test system and the correction and compensation methods of these errors are emphatically studied, and the improved opinions and correction algorithms of measurement errors are put forward. Then the antenna is monitored continuously for a long time by using the test system, and three extreme conditions, namely, extreme high temperature, extreme low temperature and maximum temperature gradient, are found in the measurement data for more than a year. Some suggestions for improving the forecasting method of extreme working conditions are put forward. Secondly, the test platform built on the 7.3m experimental antenna is extended, and applied to the practical engineering, the test platform is built on a 35m antenna, and the model of the antenna is established, and the simulation boundary condition is determined. Simulation and experimental analysis of the antenna are carried out under several operating conditions, and the causes of the errors are further analyzed according to the analysis results. Finally, with the help of single chip computer and Lab VIEWN SQL SERVER, a real-time measuring system is developed to measure the wind speed and direction in the environment where the antenna is located, and then the rule of wind in this area can be found by continuous measurement for a long time. The effect of wind speed on the temperature gradient of antenna structure is studied.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN823.27

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