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A Contribution to the Solution of the Inverse Heat Conduction Problem in Welding Simulation

  • The present thesis provides a contribution to the solution of the inverse heat conduction problem in welding simulation. The solution strategy is governed by the need that the phenomenological simulation model utilised for the direct solution has to provide calculation results within short computational time. This is a fundamental criterion in order to apply optimisation algorithms for the detection of optimal model parameter sets. The direct simulation model focuses on the application of functional-analytical methods for solving the corresponding partial differential equation of heat conduction. In particular, volume heat sources with a bounding of the domain of action are applied. Besides the known normal and exponential distribution, the models are extended by the introduction of parabolically distributed heat sources. Furthermore, the movement on finite specimens under consideration of curved trajectories has been introduced and solved analytically. The calibration of heat sourceThe present thesis provides a contribution to the solution of the inverse heat conduction problem in welding simulation. The solution strategy is governed by the need that the phenomenological simulation model utilised for the direct solution has to provide calculation results within short computational time. This is a fundamental criterion in order to apply optimisation algorithms for the detection of optimal model parameter sets. The direct simulation model focuses on the application of functional-analytical methods for solving the corresponding partial differential equation of heat conduction. In particular, volume heat sources with a bounding of the domain of action are applied. Besides the known normal and exponential distribution, the models are extended by the introduction of parabolically distributed heat sources. Furthermore, the movement on finite specimens under consideration of curved trajectories has been introduced and solved analytically. The calibration of heat source models against experimental reference data involves the simultaneous adaptation of model parameters. Here, the global parameter space is searched in a randomised manner. However, an optimisation pre-processing is needed to get information about the sensitivity of the weld characteristics like weld pool dimension or objective function due to a change of the model parameters. Because of their low computational cost functional-analytical models are well suited to allow extensive sensitivity studies which is demonstrated in this thesis. For real welding experiments the applicability of the simulation framework to reconstruct the temperature field is shown. In addition, computational experiments are performed that allow to evaluate which experimental reference data is needed to represent the temperature field uniquely. Moreover, the influence of the reference data like fusion line in the cross section or temperature measurements are examined concerning the response behaviour of the objective function and the uniqueness of the optimisation problem. The efficient solution of the inverse problem requires two aspects, namely fast solutions of the direct problem but also a reasonable number of degrees of freedom of the optimization problem. Hence, a method was developed that allows the direct derivation of the energy distribution by means of the fusion line in the cross section, which allows reducing the dimension of the optimisation problem significantly. All conclusions regarding the sensitivity studies and optimisation behaviour are also valid for numerical models for which reason the investigations can be treated as generic.zeige mehrzeige weniger

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Metadaten
Autor*innen:Andreas PittnerORCiD
Dokumenttyp:Dissertation
Veröffentlichungsform:Eigenverlag BAM
Schriftenreihe (Bandnummer):BAM Dissertationsreihe (85)
Sprache:Englisch
Jahr der Erstveröffentlichung:2012
Veröffentlichende Institution:Bundesanstalt für Materialforschung und -prüfung (BAM)
Titel verleihende Institution:Technische Universität Berlin, Fakultät V – Verkehrs- und Maschinensysteme
Gutachter*innen:Michael RethmeierORCiD, Viktor Karkhin, Dietmar Weiß
Datum der Abschlussprüfung:01.07.2011
Verlag:Bundesanstalt für Materialforschung und -prüfung (BAM)
Verlagsort:Berlin
Jahrgang/Band:85
Erste Seite:1
Letzte Seite:213
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Industrielle Fertigung / Industrielle Fertigung
Freie Schlagwörter:Analytical Solution; Global Optimisation; Neural Networks; Temperature Field; Welding
URN:urn:nbn:de:kobv:b43-733
ISSN:1613-4249
ISBN:978-3-9815134-9-1
Verfügbarkeit des Dokuments:Datei für die Öffentlichkeit verfügbar ("Open Access")
Lizenz (Deutsch):License LogoAllgemeines Deutsches Urheberrecht
Datum der Freischaltung:23.01.2015
Referierte Publikation:Nein
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