本文關(guān)鍵詞：上海65m射電望遠(yuǎn)鏡太陽(yáng)輻射作用分析　出處：《工程力學(xué)》2012年10期 　論文類型：期刊論文

  更多相關(guān)文章： 射電望遠(yuǎn)鏡 太陽(yáng)灶 非均勻溫度場(chǎng) 熱變形 型面精度

【摘要】：利用ANSYS熱分析模塊分別對(duì)天線主副反射面板結(jié)構(gòu)和天線的桿系結(jié)構(gòu)建立有限元模型,計(jì)算夏季7月15日晴天無(wú)云這一最不利氣候之一的天氣各時(shí)刻的空氣對(duì)流換熱、太陽(yáng)輻射、環(huán)境長(zhǎng)波輻射換熱以及陰影遮擋等各種邊界條件,研究分析了主面板、副面板在日照作用下的溫度場(chǎng)分布,特別是由于主面板反射太陽(yáng)輻射熱量并聚焦于副面板從而使副面板溫度劇增的"太陽(yáng)灶"現(xiàn)象;同時(shí)為獲取天線結(jié)構(gòu)在日照下指向誤差變化規(guī)律,還對(duì)天線桿系結(jié)構(gòu)進(jìn)行了日照非均勻熱變形分析,給出日照下主反射面型面精度隨時(shí)間的變化規(guī)律。結(jié)果表明:主副面板之間存在的"太陽(yáng)灶"效應(yīng)使的副面板最高溫度達(dá)135℃,由于日照非均勻溫度場(chǎng)的作用,桿系結(jié)構(gòu)中最大溫差達(dá)到10.8℃。太陽(yáng)照射引起的陰陽(yáng)面造成主反射面不均勻熱變形,在俯仰角90°工況下導(dǎo)致RMS(反射面表面各點(diǎn)誤差平方和均方根)最大增加0.35mm。這些數(shù)據(jù)為下一步結(jié)構(gòu)的施工、傳感器的布設(shè)以及局部溫度控制措施提供了參考信息。
[Abstract]:The ANSYS thermal analysis module is used to establish the finite element model of the antenna main and secondary reflection panel structure and the antenna bar structure respectively. The boundary conditions such as air convection heat transfer solar radiation environmental long wave radiation heat transfer and shadow occlusion are calculated for the cloudless weather of July 15th in summer. The temperature distribution of the main panel and the secondary panel under the action of sunlight is analyzed, especially the "solar stove" phenomenon in which the main panel reflects the solar radiation heat and focuses on the secondary panel so as to increase the temperature of the secondary panel. At the same time, in order to obtain the variation rule of the antenna structure pointing error under sunlight, the non-uniform thermal deformation analysis of the antenna rod structure is also carried out. The variation of the precision of the main reflector surface with time under sunlight is given. The results show that the maximum temperature of the secondary panel is 135 鈩，

本文編號(hào)：1400227