In this paper, the dynamic modeling of high-speed flexible links is studied. By using a stretch variable, the foreshortening deformation is introduced to the longitudinal deformation of each link, therefore, the geometric stiffening effect is naturally taken into account. The equations of motion of flexible links are obtained based on the virtual work principal. Simulation of a high-speed double-link system shows the stiffening effect on large overall motions as well as deformation of the flexible multibody system. Furthermore, the applicability of the conventional modeling method without consideration of the stiffening effect is also discussed.

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