Quasi-static data recovery for dynamic analyses of structural systems

Data recovery is a post-processing procedure employed in dynamic analyses t o recover the physical response from the modal responses obtained using the mode-displacement method. An enhanced data recovery process can improve ac curacy by compensating for the modal truncation errors. The mode-accelerati on method is a well-known data recovery technique. However, its domain of a pplication is restricted to problems having a low-frequency band of interes t. In this paper, new data recovery methods, the quasi-static data recovery methods, are presented. These new methods are based upon a quasi-static co mpensation technique that is applicable for any banded frequency domain of interest, with both high- and low-frequency modes truncated. Numerical exam ples are given to demonstrate the improvements on accuracy and applicabilit y of the proposed method compared with traditional data recovery. (C) 2001 Elsevier Science B.V. All rights reserved.