本文選題：大型天線座　切入點(diǎn)：輪軌　出處：《杭州電子科技大學(xué)》2013年碩士論文

【摘要】：射電天文學(xué)的發(fā)展，使射電望遠(yuǎn)鏡得到了越來越廣泛的應(yīng)用。隨著射電天線規(guī)模、重量越來越大，輪軌接觸副在重載荷作用下接觸變形，會影響天線軌道的水平度和天線指向精度。因此對大型射電天線輪軌系統(tǒng)的接觸力學(xué)分析、運(yùn)行仿真分析和現(xiàn)場測量具有一定的工程應(yīng)用意義。 本文首先從非赫茲接觸理論入手，建立了大型射電天線輪軌非赫茲彈塑性接觸力學(xué)模型。從理論上對天線輪軌的載荷、接觸應(yīng)力、接觸變形等方面進(jìn)行了全面分析，得到了天線滾輪與軌道接觸區(qū)的接觸應(yīng)力分布，并給出了輪滾接觸應(yīng)力的數(shù)值解，為輪軌接觸仿真分析中參數(shù)設(shè)置提供精確的指導(dǎo)，并為仿真模型的簡化提供理論支持。 其次，在理論分析的基礎(chǔ)上，運(yùn)用Msc.Patran有限元分析軟件建立了天線輪軌接觸力學(xué)仿真模型，分析了輪軌接觸區(qū)的接觸載荷分布、應(yīng)力分布、應(yīng)變以及變形情況。針對軌道彈塑性接觸應(yīng)力和變形隨輪軌接觸區(qū)到軌道接縫距離變化這一情況，建立了大型天線軌道接頭處輪軌彈塑性接觸有限元模型并進(jìn)行分析計算。 最后，通過對國家天文臺五十米口徑射電天線輪軌接觸變形的現(xiàn)場測試，進(jìn)一步驗(yàn)證仿真模型和非赫茲彈塑性接觸理論的準(zhǔn)確性，主要包括：提出一種天線座軌道水平度偏差測量方案，利用高精度數(shù)字全站儀測量系統(tǒng)對軌道面進(jìn)行了現(xiàn)場測試，提出一種可行的軌道水平度調(diào)整方法；針對軌道接頭處剛度不足，易引起射電天線指向精度下降這一問題，探索了一種現(xiàn)場測試方案，，對靠近軌道接頭不同距離的接觸情況，進(jìn)行測試。通過測試，初步得到了天線輪軌低速運(yùn)行時實(shí)際的接觸變形量，同時也驗(yàn)證了仿真分析模型與測試方法的準(zhǔn)確性。 本文所建立的輪軌接觸力學(xué)分析模型，有利于天線輪軌非赫茲接觸問題的深入研究與現(xiàn)場測試，為大型輪軌式天線座架設(shè)計提供一定的參考與指導(dǎo)。
[Abstract]:With the development of radio astronomy, radio telescopes are more and more widely used. It will affect the flatness of antenna track and the precision of antenna pointing. Therefore, it has a certain engineering application significance for the contact mechanics analysis, running simulation analysis and field measurement of the large radio antenna wheel-rail system. Based on the theory of non-hertz contact, a non-Hertz elastoplastic contact mechanics model of large radio antenna wheel / rail is established in this paper. The load, contact stress and contact deformation of antenna wheel-rail are analyzed in theory. The contact stress distribution between the antenna roller and the track contact region is obtained, and the numerical solution of the wheel roller contact stress is given, which provides accurate guidance for the parameter setting in the wheel-rail contact simulation analysis, and provides theoretical support for the simplification of the simulation model. Secondly, on the basis of theoretical analysis, the simulation model of wheel-rail contact mechanics of antenna is established by using Msc.Patran finite element analysis software, and the contact load distribution and stress distribution in wheel-rail contact area are analyzed. The finite element model of elastic-plastic contact between track and track is established and calculated according to the change of elastic-plastic contact stress and deformation with the distance from wheel-rail contact zone to rail joint. Finally, the accuracy of the simulation model and the non-Hertz elastoplastic contact theory is further verified by field testing of the wheel / rail contact deformation of the 50-meter aperture radio antenna at the National Observatory. The main contents are as follows: a measurement scheme of track flatness deviation of antenna pedestal is put forward, the track surface is tested by high precision digital total station measuring system, and a feasible method of adjusting track flatness is put forward. Aiming at the problem that the stiffness of the rail joint is insufficient and the pointing precision of the radio antenna tends to decrease, a field test scheme is explored. The contact conditions near the rail joint at different distances are tested. The actual contact deformation of the antenna wheel-rail running at low speed is preliminarily obtained, and the accuracy of the simulation analysis model and the test method is also verified. The wheel-rail contact mechanics analysis model established in this paper is beneficial to the further research and field test of the wheel-rail non-Hertz contact problem of antenna, and provides some reference and guidance for the design of large wheel-rail antenna seat frame.
【學(xué)位授予單位】：杭州電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：P111;TN820

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本文編號：1657510