考虑气压效应平流层平台柔性飞艇变形分析方法与特征研究  

Deformation analysis method and performance evaluation for flexible airship of stratospheric platform considering pressure effects

作　　者：高海健[1] 陈务军[1] 付功义[1] 何艳丽[1] 

机构地区：[1]上海交通大学空间结构研究中心,上海200030

出　　处：《应用力学学报》2012年第4期374-379,483,共6页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(50808122)

摘　　要：为研究气压对平流层飞艇变形性能的影响,基于铁木辛柯梁分析理论,将低阻尼流线形飞艇假设为分段等截面充气梁,采用叠加法推导了考虑气压效应的柔性飞艇总体挠度计算式。同时,将柔性飞艇作为预应力薄膜结构,应用ANSYS软件,采用小杨氏模量法进行充气预应力找形,并基于找形结果进行载荷下非线性变形分析。在此基础上计算了飞艇外气囊在不同头部荷载与气压下的总体挠度并比较了两种方法的计算值,发现两者变化趋势一致。最后,建立了25 m验证飞艇的计算模型,得到了控制点应力和总体变形;给出了飞艇下腹线在不同气压下的位形,将其与测量值进行比较表明:计算值和测量值基本相等,误差小于5%。本文对大型柔性飞艇设计分析具有一定的参考价值。On the basis of Timoshenko beam theory,low-damping streamline airship is assumed to be segmented inflatable fabric beam with same cross-section,superposition method is adopted to deduce the formula of flexible airship deflection and pressure effect was considered.Meanwhile,flexible airship is regarded as pre-stressed membrane structure,the form-finding is realized with small Yung’s modulus in ANSYS package,and static nonlinear analysis is performed accordingly in sequence.Then the tip deflections of airship envelope are investigated with different end loads or pressures,and the results are contrasted for two methods respectively,the trend curves are similar.Eventually,the FEM model of 25-meter airship is established,the stress and deformation of reference points are achieved,the bottom configuration of flexible airship in different pressures are calculated and compared with measurements,the results are almost the same and the error was less than 5%.The presented work is valuable to structural analysis and design of flexible airship.

关 键 词：大型柔性飞艇 铁木辛柯梁理论 非线性有限元 充气找形方法 预应力薄膜结构 

分 类 号：V274[航空宇航科学与技术—飞行器设计]