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Many slender structures in practical engineering can be considered as slender beams such as the deck of a bridge, the wing of an airplane, and the antenna of a satellite etc.How to set up the dynamical model of such a beam is the key step to analyze the dynamic characters of those slender structures.The beam which is assumed to undergo flexure about two principal axes, torsion and extension are described by nonlinear geometrical relationships including the large displacement and rotating angle.