双层充气式气动阻力锥力学特性分析  

Analysis of Mechanical Properties of the Double-layer Inflatable Aeroshell Structure

作　　者：卫剑征[1] 马瑞强[1] 张雯婷[1] 谭惠丰[1] 黄伟[2] 

机构地区：[1]哈尔滨工业大学复合材料与结构研究所,哈尔滨150080 [2]北京空间机电研究所,北京100094

出　　处：《航天返回与遥感》2014年第5期19-24,共6页Spacecraft Recovery & Remote Sensing

基　　金：CAST创新基金一般项目(NO.JSKFJ201409100005)

摘　　要：为了研究双层充气式气动阻力锥二级展开对其力学性能的影响,文章首先基于有限单元方法,利用Newton-Raphson非线性迭代计算方法分析并比较了二级展开前后的气动阻力锥结构充压变形特征,并获取二者最大应力随充气压力的变化规律;然后引入气动阻力锥结构预应力刚化效应,计算预应力下气动阻力锥结构的振动模态;最后,研究二级阻力面展开瞬时对气动阻力锥最大压力、最大温度以及气动阻力等特性的影响。结果表明:气动阻力锥二级展开,在某种程度上会引起结构强度的下降;也导致结构第三阶模态频率降低,使结构更容易受到外界激励而产生颤振,甚至导致结构破坏;但气动阻力锥的二次展开可以使得结构气动阻力增加两倍之多,可保证气动阻力锥安全抵达地面。因此,合理选择二级展开对应的飞行速度可以增加结构的安全性。In order to study the effect of the secondary deployment of double-layer inflatable aeroshell structure on its mechanical characteristics, first, the pressurized deformation of the structure before and after secondary inflation is analyzed and compared by using the Newton-Raphson iteration method in this paper based on finite element method , and the change of the maximum stresse with the inflation pressure is obtained. Then, based on the pre-stressed stiffening effect of the two inflatable aeroshell structures on the inflation pres-sure, the vibration modes are calculated. Finally, the influence of the secondary inflation on the maximum pressure, maximum temperature and the aerodynamic drag of the flow field around the structure are researched. The results show that both the structural strength and the third modal frequencies of this structure decrease when the structure achieves the secondary inflation, which implies the structures are easier to flutter due to ex-ternal excitation. However, the aerodynamic drag of the inflatable aeroshell structure has a more than three-fold increase due to the secondary inflation, which ensures the structure’s safe landing on the ground. Therefore, if a reasonable flight speed for the secondary unfolding is chosen, and the security of the structure will be increased to some extent.

关 键 词：气动阻力锥 充气结构 力学特性 再入 

分 类 号：TU352[建筑科学—结构工程]