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A pulse size estimation method for reduced-order models*

Published online by Cambridge University Press:  21 November 2016

L.M. Griffiths ,
A.L. Gaitonde ,
D.P. Jones  and
M.I. Friswell
L.M. Griffiths
Affiliation:
University of Bristol, Department of Aerospace Engineering, Bristol, UK
A.L. Gaitonde
Affiliation:
University of Bristol, Department of Aerospace Engineering, Bristol, UK
D.P. Jones*
Affiliation:
University of Bristol, Department of Aerospace Engineering, Bristol, UK
M.I. Friswell
Affiliation:
University of Swansea, College of Engineering, Swansea, UK
*
[email protected]
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Abstract

Model-Order Reduction (MOR) is an important technique that allows Reduced-Order Models (ROMs) of physical systems to be generated that can capture the dominant dynamics, but at lower cost than the full order system. One approach to MOR that has been successfully implemented in fluid dynamics is the Eigensystem Realization Algorithm (ERA). This method requires only minimal changes to the inputs and outputs of a CFD code so that the linear responses of the system to unit impulses on each input channel can be extracted. One of the challenges with the method is to specify the size of the input pulse. An inappropriate size may cause a failure of the code to converge due to non-physical behaviour arising during the solution process. This paper addresses this issue by using piston theory to estimate the appropriate input pulse size.

Keywords

reduced order modelseigensystem realisation algorithmpulsesCFD
Type
Research Article
Information
The Aeronautical Journal , Volume 120 , Issue 1234 , December 2016 , pp. 1891 - 1916
Copyright
Copyright © Royal Aeronautical Society 2016 

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Footnotes

*

Electronic supplementary information (ESI) available: Figure data can be found in a data repository (DOI: 10.5523/bris.mjzvu4runkof1eb3sy8sd28j8)

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