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Open Access Publications from the University of California

A remark about the decoupling approximation of damped linear systems

  • Author(s): Morzfeld, M;
  • Ajavakom, N;
  • Ma, F
  • et al.

A common approximation in the analysis of non-classically damped systems is to ignore the off-diagonal elements of the modal damping matrix. This procedure is termed the decoupling approximation. Contrary to widely accepted beliefs, it is shown numerically that over a finite range, errors due to the decoupling approximation can continuously increase at any specified rate while the modal damping matrix becomes more and more diagonal. © 2008 Elsevier Ltd. All rights reserved.

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