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An efficient finite element approach to examine the free vibration characteristics of liquid tankages in space launch vehicles
روش المان محدود کارآمد برای بررسی ویژگی ارتعاش آزاد tankages مایع در وسایل نقلیه پرتاب فضا-2015 This paper deals with the development of
an efficient finite element method to study the dynamic
characteristics of structures containing fluid. Structural
and fluid domains are discretized with 8-node
plate/shell element and 20 node brick element respectively.
The inviscid incompressible fluid is assumed
under irrotational motion. Proper care is taken to
eliminate the pressure at fluid–structure interfaces.
Mass due to fluid–structure interaction is merged with
structural mass and expressed the added mass in terms
of inverted fluid stiffness matrix with pre- and postmultiplication
of area coefficient matrix. An appropriate
node numbering scheme is adopted for idealizing
the structural domain and subsequently the fluid
domain to gain the computational efficiency and
reduction in the storage required for the added mass
matrix. The adequacy of the present approach is
demonstrated by considering the free vibrations of
clamped cantilever plate and clamped-free openended
cylindrical tanks and partially filled liquid
tankages having common bulk head.
Keywords Finite elements Fluid–structure
interaction Free vibrations Frequency Liquid
tankages |
مقاله انگلیسی |