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Computing Vibration-Mode Matrices From Finite-Element Output

Computing Vibration-Mode Matrices From Finite-Element Output

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Post-processing algorithms are given to compute the vibratory elastic-rigid coupling matrices and the modal contributions to the rigid-body mass matrices and to the effective modal inertias and masses. Recomputation of the elastic-rigid coupling matrices for a change in origin is also described. A computational example is included. The algorithms can all be executed by using standard finite-element program eigenvalue analysis output with no changes to existing code or source programs. NASA Tech Brief. 8.5" x 11"

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