Stochastic effects and uncertainties in assessing electromagnetic interactions with control systems

Electromagnetic compatibility, lightning, crosstalk surge voltages, Monte Carlo simulation, accident initiator

Analysis of complex microwave structures using suitable computational electromagnetic techniques

Complex Microwave Structures Wake Field Computatation PETRA III Generalized Multipole Technique Antenna Antennen Wakefelder Berechnung

Electron Beam Welding In-Process Control and Monitoring

This work presents the results of an investigation of processes in the melting zone during Electron Beam Welding(EBW) through analysis of the secondary current in the plasma.The studies show that the spectrum of the secondary emission signal during steel welding has a pronounced periodic component at a frequency of around 15–25 kHz. The signal contains quasi-periodic sharp peaks (impulses). These impulses have stochastically varying amplitude and follow each other inseries, at random intervals between series. The impulses have a considerable current (up to 0.5 A). It was established that during electron-beam welding with the focal spot scanning these impulses follow each other almost periodically. It was shown that the probability of occurrence of these high-frequency perturbation increases with the concentration of energy in the interaction zone. The paper also presents hypotheses for the mechanism of the formation of the high-frequency oscillations in the secondary current signal in the plasma.

Determinants of global color-based attention : insights from electromagnetic brain recording in humans

Otto-von-Guericke-Universität Magdeburg, Fakultät für Naturwissenschaften, Univ., Dissertation, 2015

Reduced basis approximations for electromagnetic applications

Otto-von-Guericke-Universität Magdeburg, Fakultät für Mathematik, Dissertation, 2016

Digital gesteuerte Stromquellen für das Lichtbogenschweißen

Digital control, power source, arc welding, process control, information management, transient behaviour, thermal impedance, simulation, duty cycle, system design

Controlled resolution reconstruction of one-dimensional permittivity profiles

Electromagnetic scattering inverse problems, microwave imaging, reconstruction of dielectric media, remote sensing, tomography

Erarbeitung eines Modells zur Entwicklung und Optimierung von Lichtbogenschweißbrennern

Electrical welding torch, MAG-torch, MIG-torch, TIG-torch

Entwicklung von Maßnahmen zur Heißrissvermeidung beim Einseitenschweißen langer Schweißnähte : [Rissproblematik am Schweißnahtende beim UP-Tandem-Schweißen im Schiffbau]

Hot crack, shipbuilding, FEM, run out plate, heating, cross displacement, speed of cross displacements, one-side welding

Untersuchungen über den Einfluss und die Wirkungen von Stickstoffzusätzen im Schutzgas auf das Heißrissverhalten ausgewählter heißrissempfindlicher Nickel-Basiswerkstoffe

Nickel-base alloys, hot-crack behaviour, nitrogenous shielding gas, PVR-test, TIG welding, pulsed gas metal-arc welding

Ungleichförmige und zufällig geführte Mehrfachleitungen in komplexen, technischen Systemen

Nonuniform transmission line, random multiconductor transmission line, electromagnetic topology, transmission line networks

Herstellung beschichteter Mehrblechverbindungen im Karosseriebau mit Hilfe der Hochleistungslasertechnik : [Laserschweißen von ZE sowie ZE-Mg beschichteten Blechen im Dreifachüberlappstoß]

Automotive, laser welding, coated sheet, multi joint

Grundlagen und Anwendungen von Modenverwirbelungskammern

Mode stirred chamber, reverberation chamber, electromagnetic compatibility (EMC), statistical electromagnetics

Schweißgerechte Struktur- und Prozessstrategien im Flugzeugbau

Aluminium, Fuselage,Fuselage Construction, Hot Cracking, Laser Beam Welding, Stringer, Weldability, Welding, Welding Process, Airbus, A318, A380, AA6013, AA6056

Erstellung einer Blitzschutzrichtlinie für die Produktpalette der FAM im Auftrag der "Gesellschaft für Prozeßautomation mbH" (GPA)"

On the basis of the global use of the FAM installations and systems, their location, type and height, a lightning protection system is required, which protects humans and machines from danger of a lightning. At the beginning the development, the threat and the potential for destruction of lightning are described. Besides the resulting solid normative calculation models and tables are presented. Then, the product portfolio of the FAM is characterized. From this demonstration models are selected; on the one hand a model for the totality of all portable devices and the other hand a model which defines the power plants. Subsequently, the risk management and a strengths and weaknesses analysis are performed. After that, with graphical and mathematical models, these weaknesses as well as the functional equipotential bonding and grounding system and its dimensioning are investigated and solutions are demonstrated. The following is a coordination of lightning protection standard with other directives and standards in order to classify the resulting internal lightning protection and protective measures against electromagnetic pulse and to generate a uniform protection and application platform. Furthermore, problems of the economy of protective circuit is shown and a solution is given. Finally, the indicated possible solutions are replaced by definitions. The main classification and structure of lightning protection directive are shown and exemplarily applied.