【作者】 张林林；

【导师】 王芳林；

【作者基本信息】 西安电子科技大学 ， 机械制造及其自动化， 2011， 硕士

【摘要】 充气展开薄膜天线在结构技术方面与机械可展开天线相比,具有大口径、轻质量、低能耗等优点,是未来大口径甚至超大口径天线的理想选择。而天线工作状态的形面精度是天线最重要的结构指标,直接影响天线的电性能和使用情况。为提高天线的反射面精度,比较研究两种成型理论。对于平面-抛物面型充气展开天线反射面:利用弹性力学理论分析形面,研究天线在轨时温度变化对反射面的影响;对于拼接-抛物面型反射面:为使充气变形后反射面逼近理想抛物面,经过保形分析、裁剪设计、裁剪片拼接,经分析得充气变形前的曲面形状,并在充气气压作用下变形成最终的反射面。利用ANSYS对拼接-抛物面型反射面进行反射面精度的参数分析,包括内压、材料属性、厚度、内压、反射面焦距等。针对地面验证试验的三种实验姿态,分析重力对反射面形面的影响;对2米口径充气展开天线结构的工作状态,利用有限元软件ANSYS建立有限元模型,分析结构的固有频率和对应振型,分析中考虑充气气体和反射面薄膜之间的流固耦合作用,采用声音介质模拟充气气体对结构的振动。研究天线结构设计参数的选择对结构动力性能的影响。基于ANSYS对充气展开天线结构作优化分析,确定在一定气压作用下选择合适的材料,薄膜厚度与焦径比,使得充气成形抛物面与理想抛物面的绝对均方根误差达到最小值。因此研究充气展开天线形面精度的优化,对结构及其与电性能匹配设计具有非常重要的意义。更多还原

【Abstract】 Compared to mechanics deployment antenna, the inflatable Antenna structure technology has many advantages of large caliber, light weight, low-power and is one of the best choice for large antenna. The shape precision of reflector on orbit is the most important target of the antenna, which affects the electric and work performance of the antenna.To enhance precision of inflatable reflector,two kinds of figuration theories were investigated and compared. The first one is titled as plan-parabolic reflector. The elastic theory analysis was utilized. Based on these works,the influence that temperature variety affects on the reflector precision on orbit was researched . The second one is titled as seaming parabolic reflector. For the deformed surface is required to be ideal parabolic, the theoretical studies, conformal analysis,cutting-pattern,membrane film seaming and then inflatable were described. The seaming parabolic reflector was chose in the following research.Precision analysis of inflatable reflector by ANSYS were conducted,and all important design parameters such as inflation pressure,membrane thickness, material characteristics and Pre-tension stress of cable were investigated. The gravity influence in the reflector was compared under three postures and chooses one of them as final experiment posture. Analysis model of 2m antenna in ANSYS was built to analyze natural frequencies and corresponding modes of the inflatable reflector structure. The analysis work has considered fluid-structure interaction between inflatable gas and the membrane material in reflector structure. This dissertation employed the 3D solid acoustic elements of standard FE software to simulate the inflation gas influence. The effects of all important design parameters on the modes were investigated.Based on ANSYS inflatable antenna structure for optimization analysis, confirmed in certain pressure under the action of choosing appropriate materials, membrane film thickness and focal diameter ratio, making the inflatable forming parabolic and ideal parabolic error of RMS absolute minimum value.As a result,it is significant for suited design between structure and electricity performance to research the surface accuracy optimization analysis of inflatable deployable antenna.更多还原