Abstract
ABSTRACT This paper analyzes the effects of mode selection, scaling, and orthogonalization on dynamic analysis of flexible mechanical systems. The effects of mode selection are investigated by combining attachment modes and constraint modes with vibration normal modes to represent elastic deformations of flexible components. Four sets of input data that depend on the options for mode scaling and orthogonalization are generated. The dynamic response and computer simulation times for each set are compared. Two examples are chosen: (1) a cantilever beam and (2) a vehicle with a flexible chassis. With vibration normal modes and attachment modes, it was found that mode scaling was helpful for efficient simulation, while the effect of mode orthogonalization was problem-dependent. With vibration modes and constraint modes, however, mode scaling had no effect or detracted from numerical efficiency.
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