Abstract
Equations of motion of a flexible body system, combined with finite element information of components, are derived by the Lagrange method, using virtual rotations. The combinations of static correction modes, Ritz vectors, and vibration normal modes are used in this paper to capture the effect of concentrated loads such as joint reaction forces and suspension forces. In order to obtain well-conditioned equations of motion, deformation modes derived from the consistent mass matrix are orthonormalized with respect to the lumped mass matrix in an optimal way. An example is used to demonstrate the results.
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