Siyang Piao1, Huajiang Ouyang1, 2, Yahui Zhang1, *
CMES-Computer Modeling in Engineering & Sciences, Vol.122, No.2, pp. 571-591, 2020, DOI: 10.32604/cmes.2020.08789
Abstract A beam approximation method for dynamic analysis of launch vehicles
modelled as stiffened cylindrical shells is proposed. Firstly, an initial beam model of the
stiffened cylindrical shell is established based on the cross-sectional area equivalence
principle that represents the shell skin and its longitudinal ribs as a beam with annular
cross-section, and the circumferential ribs as lumped masses at the nodes of the beam
elements. Then, a fine finite element model (FE model) of the stiffened cylindrical shell
is constructed and a modal analysis is carried out. Finally, the initial beam model is
improved through model updating against the natural… More >
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