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
1. Department of Mechanics & Engineering Science,Fudan University, Shanghai,200433,China;2. Shanghai Institute of Astronautical Systems Engineering,Shanghai,201108,China
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.
2012, Vol. 31 
