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- W48640877 abstract "In the field of stochastic structural dynamics, perturbation methods are widely used to estimate the response statistics of uncertain systems. When large built up systems are to be modelled in the mid-frequency range, perturbation methods are often combined with finite element model reduction techniques in order to considerably reduce the computation time of the response. Existing methods based on Component Mode Synthesis(CMS) allow the uncertainties in the system parameters to be treated independently in each of the substructures and the perturbation in the local parameters to be propagated to the full system global parameters. However, local treatment of damping uncertainty is usually avoided by assuming proportional damping. Here, a perturbation method that includes local modal damping uncertainty and its propagation to the global response is proposed. Local damping is accounted for in the CMS model by use of complex modes. A perturbation relationship between local and global modal properties is stated for non-classically damped systems. In this way, the response statistics for uncertain systems with localized damping can be computed at a low computational cost. A numerical example is presented to illustrate the performance of the proposed method." @default.
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- W48640877 date "2012-09-18" @default.
- W48640877 modified "2023-09-27" @default.
- W48640877 title "Uncertainty propagation in locally damped dynamic systems" @default.
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