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Consistent structural linearisation in flexible-body dynamics with large rigid-body motion

by: Henrik Hesse, Rafael Palacios
Computers & Structures, Vol. 110-111 (November 2012), pp. 1-14, doi:10.1016/j.compstruc.2012.05.011  Key: citeulike:10866384

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Abstract

A consistent linearisation, using perturbation methods, is obtained for the structural degrees of freedom of flexible slender bodies with large rigid-body motions. The resulting system preserves all couplings between rigid and elastic motions and can be projected onto a few vibration modes of a reference configuration. This gives equations of motion with cubic terms in the rigid-body degrees of freedom and constant coefficients which can be pre-computed prior to the time-marching simulation. Numerical results are presented to illustrate the approach and to show its advantages with respect to mean-axes approximations. ⺠Beam kinematics with large rigid-body motions and small deformations. ⺠An assessment of all inertial couplings between degrees of freedom. ⺠Modal form of the equations of motion in terms with nonlinear rigid-body dynamics. ⺠Improvements shown with respect to mean axes approach used in flight dynamics.


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