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Model order reduction methods applied to a welding model

Fredrik Sikström (Institutionen för signaler och system, Automation) ; A. K. Christiansson ; Bengt Lennartson (Institutionen för signaler och system, Automation)
Proceedings of the Institution of Mechanical Engineers Part I-Journal of Systems and Control Engineering (0959-6518). Vol. 226 (2012), I7, p. 972-984.
[Artikel, refereegranskad vetenskaplig]

A finite element representation modelling transient heat conduction of gas tungsten arc welding of stainless steel is used to evaluate different methods for model order reduction. The focus is on establishing a linear low-order model of the dynamic relation between the welding current and the temperature measured by a radiation pyrometer. The objective of this low-order model is to design a model-based feedback controller and to investigate the consequences of applying feedback control of the process. Three different approaches for model reduction have been evaluated, namely the Krylov subspace method for moment matching, balanced truncation and parametric system identification. The study provides a knowledge base for the selection of model order reduction methods when dealing with large-scale systems like finite element models of transient heat conduction, and it recommends parametric system identification. It renders sufficient approximations for controller design, no linearization of the finite element model is required, and there is no limit on degrees of freedom of the finite element model.

Nyckelord: Finite element modelling, welding, model order reduction, moment matching, balanced truncation, proper orthogonal decomposition, heat-transfer, systems, mems, pod



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Denna post skapades 2012-11-09. Senast ändrad 2013-01-16.
CPL Pubid: 165762

 

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Institutioner (Chalmers)

Institutionen för signaler och system, Automation (2005-2017)

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Produktion
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Chalmers infrastruktur