Abstract
MSC NASTRAN introduced residual vectors in 2005. They are used to improve solution accuracy by representing the static contributions of truncated modes in transient and frequency response calculations. This formulation is convenient because the residual vectors are added to the modal vectors to form an augmented basis set, where the residual vectors are orthogonal to each other and to the original mode set. Modal frequency response calculations then proceed as usual only with a few extra vectors in the basis set. This talk will focus on evaluating the improvements in accuracy that can be achieved using residual vectors for modal frequency response problems where two structures with truncated mode sets are joined together.
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