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Finite Element Model Reduction of Thermal Systems with Conductive and Radiative Heat Transfers
Jacques, Lionel; Masset, Luc; Kerschen, Gaëtan
2015
 

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Keywords :
Space; Thermal; Reduction; Finite Element
Abstract :
[en] The Lumped parameter method (LPM) is the main method used for space structures thermal design. It is very versatile and allows easy integration of user-defined components but the computation of the conductive links is error-prone and still too often computed by hand. Widely used in structural design, the finite element method (FEM) is however not yet often used for thermal analysis. One of the main reasons is that the radiative exchange factors, usually computed through Monte Carlo ray tracing, are extremely expensive to compute due to the large number of elements composing a FE model. A new global approach for FE model reduction of thermal systems is presented. The method is based on an automated FE mesh partitioning leading to super-faces and super-nodes. It is tailored for radiative exchange factors computation, taking into account selected quadric recognition and material constraints. The method also provides accurate conductive links computation and enables a direct mapping of the reduced temperatures back onto the detailed FE mesh (for e.g. thermo-elastic analyses). The application to two instruments developed at the Centre Spatial de Liège in Belgium will be presented, namely the Extreme Ultraviolet Imager (EUI) onboard Solar Orbiter and the Back Telescope Assembly (BTA) onboard Meteosat Third Generation.
Research center :
Space Structures and Systems Laboratory
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Jacques, Lionel  ;  Université de Liège > CSL (Centre Spatial de Liège)
Masset, Luc ;  Université de Liège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
Kerschen, Gaëtan  ;  Université de Liège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
Language :
English
Title :
Finite Element Model Reduction of Thermal Systems with Conductive and Radiative Heat Transfers
Publication date :
24 March 2015
Event name :
Spacecraft Thermal Control Workshop
Event organizer :
The Aerospace Corporation
Event place :
El Segundo, California, United States
Event date :
from 24/03/2015 to 26/03/2015
Audience :
International
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 15 August 2015

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