Fak. 5 Verkehrs- und Maschinensysteme

1281 Items

Recent Submissions
Wear Analysis of a Heterogeneous Annular Cylinder

Li, Qiang ; Forsbach, Fabian ; Schuster, Maximilian ; Pielsticker, Daniel ; Popov, Valentin L. (2018-03-18)

Wear of a cylindrical punch composed by two different materials alternatively distributed in annular forms is studied with the method of dimensionality reduction (MDR). The changes in surface topography and pressure distribution during the wear process is obtained and validated by the boundary element method (BEM). The pressure in each annular ring approaches a constant in a stationary state wh...

Numerical Assessment of Virtual Control Surfaces for Load Alleviation on Compressor Blades

Motta, Valentina ; Malzacher, Leonie ; Peitsch, Dieter (2018-01-17)

Virtual control surfaces for the optimization of steady and unsteady airloads on a compressor cascade are assessed numerically. The effects of mechanical surfaces are realized with plasma actuators, located both on the pressure and on the suction side of the blade trailing edge. Suction side plasma actuation is thought to reproduce the effects of mechanical wing spoilers, whereas pressure side ...

Excitation of the precessing vortex core by active flow control to suppress thermoacoustic instabilities in swirl flames

Lückoff, Finn ; Oberleithner, Kilian (2019-07-04)

In this study, we apply periodic flow excitation of the precessing vortex core at the centerbody of a swirl-stabilized combustor to investigate the impact of the precessing vortex core on flame shape, flame dynamics, and especially thermoacoustic instabilities. The current control scheme is based on results from linear stability theory that determine the precessing vortex core as a global hydro...

Education for sustainable development within the engineering sciences - design of learning outcomes and a subsequent course evaluation

Baier, André (2019)

This dissertation is an an educational design research project (Plomp 2013) which follows the classical research steps: research clarification, description of a problem area, analysis, design and evaluation. Each step is described in a separate chapter and the research project: Research Clarification - This chapter describes the research function along with the characteristics of an educationa...

Präzisere Echtzeit-Flugsimulation kleiner Nutzflugzeuge durch Integration feingranularer Teilmodelle

Meyer-Brügel, Wolfram (2019)

Die Technologien und Anwendungsgebiete für UAV und kleine Nutzflugzeuge haben im zivilen Bereich in letzter Zeit eine rasante Entwicklung erfahren. Da der Betrieb dieser Systeme mit erheblichen Sicherheitsrisiken für den Luftverkehr verbunden ist, wird für die Soft- und Hardwareentwicklung der erforderlichen komplexen und sicherheitskritischen Avioniksysteme ein Prozess benötigt, der eine vergl...

Untersuchung der Verknüpfungsmöglichkeiten zwischen dem Rad- und Busverkehr in ländlichen Gebieten am Beispiel des Landkreises Barnim

Böhme, Uwe (2019)

Die Verknüpfung von Verkehrsmitteln erlangt vor allem im ländlichen Raum eine zunehmend stärkere Bedeutung. Der intermodalen Verbindung aus Fahrrad und Bus wurde bislang nur vereinzelt im Freizeitverkehr Beachtung geschenkt, für den Alltagsverkehr wurde sie bislang noch nicht untersucht. Ob diese Mobilitätsform auch im Alltagsverkehr und insbesondere für die Gestaltung von Arbeitswegen eine sin...

An extended modal approach for nonlinear aeroelastic simulations of highly flexible aircraft structures

Ritter, Markus Raimund (2019)

Some classes of aircraft are characterized by highly flexible wings undergoing large structural deformations in steady and maneuvering flight. In most cases this flexibility is the result of a high aspect ratio, which is in turn forced by dedicated design criteria such as the reduction of the induced drag. Prominent examples for such configurations are High Altitude Long Endurance (HALE) aircra...

Comprehensive Thermodynamic Analysis of the Humphrey Cycle for Gas Turbines with Pressure Gain Combustion

Stathopoulos, Panagiotis (2018-12-18)

Conventional gas turbines are approaching their efficiency limits and performance gains are becoming increasingly difficult to achieve. Pressure Gain Combustion (PGC) has emerged as a very promising technology in this respect, due to the higher thermal efficiency of the respective ideal gas turbine thermodynamic cycles. Up to date, only very simplified models of open cycle gas turbines with pre...

Thermodynamik der deformierbaren Festkörper unter Einfluss des Elektromagnetismus und die numerische Berechnung multiphysikalischer Prozesse

Abali, Bilen Emek (2019)

Die mathematische Beschreibung und zugehörige Simulation deformierbarer Festkörper unter mechanischer, thermischer und elektromagnetischer Belastung werden dargestellt. Ein solches multiphysikalisches System wird durch Bilanzgleichungen im Verbund mit konstitutiven Gleichungen berechenbar. Die Bilanzgleichungen inklusive Elektromagnetismus werden diskutiert und motiviert. Die konstitutiven Glei...

In Silico Optimization of Femoral Fixator Position and Configuration by Parametric CAD Model

Korunovic, Nikola ; Marinković, Dragan ; Trajanovic, Miroslav ; Zehn, Manfred ; Mitkovic, Milorad ; Affatato, Saverio (2019-07-22)

Structural analysis, based on the finite element method, and structural optimization, can help surgery planning or decrease the probability of fixator failure during bone healing. Structural optimization implies the creation of many finite element model instances, usually built using a computer-aided design (CAD) model of the bone-fixator assembly. The three most important features of such CAD ...

Configuration Equilibrium Model of Product Variant Design Driven by Customer Requirements

Yang, Qin ; Bian, Xianjun ; Stark, Rainer ; Fresemann, Carina ; Song, Fei (2019-04-08)

In view of the dynamic change of customer requirements (CRs) during the process of product use, in this paper we propose a Bayesian Nash equilibrium configuration model for product variant design driven by CRs. By analyzing CRs, the complete variant requirements of the products can be obtained. Combined with modularization and parameterization variant design methods, a parametric variant instan...

Leveraging Circular Economy through a Methodology for Smart Service Systems Engineering

Halstenberg, Friedrich A. ; Lindow, Kai ; Stark, Rainer (2019-06-27)

Product Service Systems (PSS) and Smart Services are powerful means for deploying Circular Economy (CE) goals in industrial practices, through dematerialization, extension of product lifetime and efficiency increase by digitization. Within this article, approaches from PSS design, Smart Service design and Model-based Systems Engineering (MBSE) are combined to form a Methodology for Smart Servic...

Dealing with Nap-Core Sandwich Composites: How to Predict the Effect of Symmetry

Ha, Giap ; Zehn, Manfred ; Marinković, Dragan ; Fragassa, Cristiano (2019-03-15)

The behavior of nap-core sandwiches was investigated with a special focus on the effect of symmetry in nap cores. A nap-core is, in general terms, a 3D-formed hollow structure made of knitted textile impregnated by a thermosetting resin. The molding process determines if the nap-core is double-sided (symmetric) or single-sided. The sandwich with nap-core owns various remarkable properties of a ...

Numerical Simulation on the Origin of Solidification Cracking in Laser Welded Thick-Walled Structures

Bakir, Nasim ; Artinov, Antoni ; Gumenyuk, Andrey ; Bachmann, Marcel ; Rethmeier, Michael (2018-06-01)

One of the main factors affecting the use of lasers in the industry for welding thick structures is the process accompanying solidification cracks. These cracks mostly occurring along the welding direction in the welding center, and strongly affect the safety of the welded components. In the present study, to obtain a better understanding of the relation between the weld pool geometry, the stre...

Is Tribology Approaching Its Golden Age? Grand Challenges in Engineering Education and Tribological Research

Popov, Valentin L. (2018-11-19)

In spite of its obvious importance, the subject of tribology has relatively low visibility in the engineering community and among the general public. The author's hypothesis is that this problem is at least partly due to the poor “availability” of tribology. In other words, there are practically no simple methods or concepts having high predictive power for tribological problem-solving. That si...

Improvement of Filler Wire Dilution Using External Oscillating Magnetic Field at Full Penetration Hybrid Laser-Arc Welding of Thick Materials

Üstündağ, Ömer ; Avilov, Vjaceslav ; Gumenyuk, Andrey ; Rethmeier, Michael (2019-05-23)

Hybrid laser-arc welding offers many advantages, such as deep penetration, good gap bridge-ability, and low distortion due to reduced heat input. The filler wire which is supplied to the process is used to influence the microstructure and mechanical properties of the weld seam. A typical problem in deep penetration high-power laser beam welding with filler wire and hybrid laser-arc welding is a...

An Accurate Finite Element Method for the Numerical Solution of Isothermal and Incompressible Flow of Viscous Fluid

Abali, Bilen Emek (2019-01-08)

Despite its numerical challenges, finite element method is used to compute viscous fluid flow. A consensus on the cause of numerical problems has been reached; however, general algorithms—allowing a robust and accurate simulation for any process—are still missing. Either a very high computational cost is necessary for a direct numerical solution (DNS) or some limiting procedure is used by addin...

Boehmite Nanofillers in Epoxy Oligosiloxane Resins: Influencing the Curing Process by Complex Physical and Chemical Interactions

Topolniak, Ievgeniia ; Hodoroaba, Vasile-Dan ; Pfeifer, Dietmar ; Braun, Ulrike ; Sturm, Heinz (2019-05-09)

In this work, a novel boehmite (BA)-embedded organic/inorganic nanocomposite coating based on cycloaliphatic epoxy oligosiloxane (CEOS) resin was fabricated applying UV-induced cationic polymerization. The main changes of the material behavior caused by the nanofiller were investigated with regard to its photocuring kinetics, thermal stability, and glass transition. The role of the particle sur...

Short- and Long-Range Mechanical and Chemical Interphases Caused by Interaction of Boehmite (γ-AlOOH) with Anhydride-Cured Epoxy Resins

Ghasem Zadeh Khorasani, Media ; Elert, Anna-Maria ; Hodoroaba, Vasile-Dan ; Agudo Jácome, Leonardo ; Altmann, Korinna ; Silbernagl, Dorothee ; Sturm, Heinz (2019-06-04)

Understanding the interaction between boehmite and epoxy and the formation of their interphases with different mechanical and chemical structures is crucial to predict and optimize the properties of epoxy-boehmite nanocomposites. Probing the interfacial properties with atomic force microscopy (AFM)-based methods, especially particle-matrix long-range interactions, is challenging. This is due to...

Identifizierung leistungsrelevanter Merkmale der Teamkommunikation in der Domäne Flugsicherung

Papenfuß, Anne (2019)

Die Arbeit von Teams ist ein Einflussfaktor auf die Leistungsfähigkeit des Luftverkehrssystems. In dieser Arbeit wird ein Ansatz zur Analyse der Teamkommunikation vorgestellt, um Teamarbeit und den Einfluss neuartiger Flugführungskonzepte in High-Fidelity-Simulationen zu erfassen. Hierzu wurde der Einfluss der situativen Faktoren Kommunikationsmedium und Erfahrung auf das Kommunikationsverhalte...