A perturbation method for locally damped dynamic systems
A perturbation method for locally damped dynamic systems
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.
Cortes Mochales, Lluis
a513bd47-a791-447f-90f2-bf89b162a949
Ferguson, Neil Stuart
8cb67e30-48e2-491c-9390-d444fa786ac8
Bhaskar, Atul
d4122e7c-5bf3-415f-9846-5b0fed645f3e
10 July 2012
Cortes Mochales, Lluis
a513bd47-a791-447f-90f2-bf89b162a949
Ferguson, Neil Stuart
8cb67e30-48e2-491c-9390-d444fa786ac8
Bhaskar, Atul
d4122e7c-5bf3-415f-9846-5b0fed645f3e
Cortes Mochales, Lluis, Ferguson, Neil Stuart and Bhaskar, Atul
(2012)
A perturbation method for locally damped dynamic systems.
19th International Congress on Sound and Vibration, Vilnius, Lithuania.
08 - 12 Jul 2012.
Record type:
Conference or Workshop Item
(Other)
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.
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ICSV19LluisCortes.pdf
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Published date: 10 July 2012
Venue - Dates:
19th International Congress on Sound and Vibration, Vilnius, Lithuania, 2012-07-08 - 2012-07-12
Organisations:
Dynamics Group
Identifiers
Local EPrints ID: 338022
URI: http://eprints.soton.ac.uk/id/eprint/338022
PURE UUID: b8a60558-e160-422f-a014-a27db512514e
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Date deposited: 28 Aug 2012 15:40
Last modified: 15 Mar 2024 02:34
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Author:
Lluis Cortes Mochales
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