推进剂与贮箱液固耦合振动的动力学分析

朱琳;唐国安;柳征勇;刘靖华;狄文斌

振动与冲击 ›› 2012, Vol. 31 ›› Issue (5) : 139-143.

PDF(1386 KB)
PDF(1386 KB)
振动与冲击 ›› 2012, Vol. 31 ›› Issue (5) : 139-143.
论文

推进剂与贮箱液固耦合振动的动力学分析

  • 朱琳1,唐国安1,柳征勇2,刘靖华2,狄文斌2
作者信息 +

Dynamics Analysis of Fluid-structure Coupled Vibration for Propellants and Fuel Tank

  • Zhu Lin1, Tang Guo-an1, Liu Zheng-yong2, Liu Jing-hua2, Di Wen-bin2
Author information +
文章历史 +

摘要

分析液体燃料运载火箭的推进剂及贮箱的耦合振动时,为了精确建模、工程化快速计算及为火箭整体系统提供液固耦合燃料系统等效模态参数,根据有限元方法得到包含液体节点压力和结构节点位移的非对称形式的耦合动力学方程组,将表征液体运动的节点压力缩聚到液体自由面,使得方程对称化。通过等价Laplace方程边值问题的求解,得到耦合动力学方程中液体对结构的附加质量矩阵、附加刚度矩阵及耦合项。简易贮箱液固耦合模态分析的算例结果表明,该分析方法能够精确、快速地获得液固耦合系统的模态频率等动力学特性。从而使得高效率的液固耦合动力学分析在工程上应用成为可能,并为运载火箭等复杂液固耦合结构的有限元建模由简化模型向三维精确模型建立和工程化应用建立了基础。

Abstract

The analysis of fluid-structure coupled vibration for propellants and fuel tank in launch vehicle,in order to achieve accurate modeling, efficient calculation and providing modal parameter to the launch vehicle system,based on the asymmetrically dynamic formulas which contained fluid node pressure and structure node displacement in finite element method. Model reduction method is used on fluid node pressure,and get symmetrically dynamic formulas. According to solving the boundary value problems in equivalent Laplace formulas,get the additional mass matrix, additional stiffness matrix and coupling matrix which are equivalent from fluid to structure in coupled dynamic formulas.The example of the modal analysis for propellants and fuel tank demonstrate that this method can get the modal frequency accurately and rapidly in fluid-structure coupled vibration system.This method means efficient dynamics analysis of fluid-structure coupled vibration in engineering,and means the change for simple modelling to 3-Dimension accurate modeling and engineering application for fluid-structure coupled vibration in launch vehicle.

关键词

液固耦合 / 推进剂 / 贮箱 / 模态分析 / 动力学分析

Key words

fluid-structure coupled vibration / propellants / tank / modal analysis / Dynamics analysis

引用本文

导出引用
朱琳;唐国安;柳征勇;刘靖华;狄文斌. 推进剂与贮箱液固耦合振动的动力学分析[J]. 振动与冲击, 2012, 31(5): 139-143
Zhu Lin;Tang Guo-an;Liu Zheng-yong;Liu Jing-hua;Di Wen-bin. Dynamics Analysis of Fluid-structure Coupled Vibration for Propellants and Fuel Tank[J]. Journal of Vibration and Shock, 2012, 31(5): 139-143

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