UNIVERSITAET DER BUNDESWEHR HAMBURG (GERMANY F R) FACHBEREICH ELEKTROTECHNIK

Direct Calculation of Short Circuit Reactance, Winding Strength, and Inherent Forms of Output Transformers (Direkte Berechung der Kurzschlussreaktanzen, Wicklungskraefte und Eigenformen von Leistungstransformatoren)

2001

Authors: Christian Bollman; UNIVERSITAET DER BUNDESWEHR HAMBURG (GERMANY F R) FACHBEREICH ELEKTROTECHNIK

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The dissertation seeks to employ boundary-element methods (regarding finite elements and differences) in determining how detailed the modeling of an output transformer must be in order to deliver sufficiently precise results. A two-dimensional transformer model, from which the unwinding of the transformer shall take place, is suitable for the calculation of magnetic fields, and yields valuable clarifications. The mathematical components to the study are described in terms of boundary- value ...

Zum Lernverhalten von Backpropagation-Netzen auf der Basis stochastischer Rechentechnik (On the Learning Process of Back-Propagation Nets on the Basis of Stochastic Computation)

JUN 2000

151 pages

Authors: Liyun Zhu; UNIVERSITAET DER BUNDESWEHR HAMBURG (GERMANY F R) FACHBEREICH ELEKTROTECHNIK

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The dissertation entails a detailed examination of the adaptive or learning process of a back-propagation net, used for the building of massive parallel neural networks, and based on the level of mathematical induction, stochastic computation, and software simulation. Firstly are the introductory bases of the back-propagation new discussed. Parameters and an adaptive process are then selected, followed by limitations and countermeasures. The results of the examination and software simulation demonstrate ...

Lebensdauerabschaetzung von Loetverbindugen oberflacechenmontierter Bauteile be thermischer Wechselbeanspruchung unter Beruechtigung der Bedeutung elastischer, plastischer und Kreichdehnungsanteile (Longevity of Taft Joints of Superficially Mounted Constr

1999

166 pages

Authors: Andreas Warnke; UNIVERSITAET DER BUNDESWEHR HAMBURG (GERMANY F R) FACHBEREICH ELEKTROTECHNIK

The goal of this study is the refinement of the technique of low- frequency fatigue analyses of a Taft joint through computer simulation, in order to obtain, in the shortest time possible, a more precise expression of their longevity. To answer the central query, 'how long does the Taft joint hold?', there exists a series of concomitant questions, around which the study centers: on what kind of Taft joint longevity ...

Additive Pulse Mode-Coupling of a Nd: YAG Laser: Attempts at a Self- Stabilizing System

1999

128 pages

Authors: Hinrich Groninga; UNIVERSITAET DER BUNDESWEHR HAMBURG (GERMANY F R) FACHBEREICH ELEKTROTECHNIK

Using a numerical model, the dissertation describes, "an Additive- Pulse Mode Locked (APM) Nd:YAG-Laser" in various configurations. The relationship between the photon density and the occupational density of the laser's upper level represents the basis for the numerical treatment of the strengthening in the laser-active medium (chapter 2). The nonlinear medium of an APM-laser, the glass fiber, is described in chapter three. Chapter four treats the principle of mode-coupling, with ...