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ABSTRACT
Computationally efficient, high fidelity flexible multibody dynamic simulation requires that a flexible body model be of low dimension, yet account for effects of interest. Model reduction methods are reviewed, and a new type of component: mode, called a system-level component mode, is extracted from results of analysis of the entire system. A system-level component mode is decomposed into two parts: deformation of the component and rigid-body motion. It is shown that the latter degrades simulation accuracy. Extraction of rigid-body modes from the system-level component modes is carried out by maximizing strain energy for unit displacement norm. Dependency, or near dependency, in the resulting set of deformation modes is identified and removed using a method based on singular value decomposition. Numerical examples are presented to demonstrate the effectiveness of the approach.
Notes
*Communicated by E. J. Haug