Abstract
A method for modeling transient dynamics of rotating flexible components is presented. Such dynamic models are of practical importance for both design and control of several engineering applications. Examples are airplane propellers and flexible appendages of spinning spacecrafts. This method is based on a nonlinear formulation of the Lagrangian form in conjunction with the finite element technique. A mixed set of generalized coordinates that accounts for inertia coupling between reference motions and local elastic deformations is employed. Component mode substitution techniques are used for generating a finite set of selected modal coordinates. The formulation accounts for component mode changes due to the effect of the reference rotational speed of the elastic component. Base motion excitations due to impulsive forces are taken into consideration. Numerical results are presented for a simplified model of an aircraft propeller during touch-down impact.
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