确定贮箱流固耦合纵向振子模型参数的有限元方法  

Finite Element Method in Determining Coefficients of Fluid-Solid Coupling Longitudinal Oscillator Model for Propellant Tanks

作　　者：韦笑[1] 杨琼梁 张美艳[1] 唐国安[1] 

机构地区：[1]复旦大学力学与工程科学系,上海200433 [2]上海宇航系统工程研究所,上海201109

出　　处：《上海航天》2015年第6期39-42,共4页Aerospace Shanghai

基　　金：国家自然科学基金资助(11202052)

摘　　要：为突破复合材料、非均质和加筋壁等结构复杂因素对经典无矩壳理论解析分析运载火箭贮箱箱体变形时的制约,将有限元计算用于确定振子刚度系数,通过高斯公式将三维体积分转为二维面积分,提高了计算效率。算例表明:该法的精度与解析法相当,但应用范围不再受结构复杂性的限制。In order to eliminate the constraint conditions of complex factors such as composite material, heterogeneity and reinforcing steel bars during analysis of the propellant tank deformation in rocket vehicle using classic analytical calculation, a method using finite element calculation to determine the spring constants of the oscillator was proposed in this paper, which could be used to calculate the location of the changed liquid surface. With the help of Gauss formula, volume integrals were transferred into surface integrals, and the efficiency was greatly improved. Calculation example was showed that this finite element method had the same level of precision as the analytical way, but the range of application was no longer limited by the structure complexity.

关 键 词：运载火箭 推进剂贮箱 振动 流固耦合 

分 类 号：V414.19[航空宇航科学与技术—航空宇航推进理论与工程]