Fak. 5 Verkehrs- und Maschinensysteme

1383 Items

Recent Submissions
Contacts With Negative Work of “Adhesion” and Superlubricity

Popov, Valentin L. (2020-01-22)

Van der Waals forces between solids in vacuum are always attractive and are considered as the main source of adhesion. However, in the presence of an intermediate medium, they can also be repelling (Dzyaloshinskii et al., 1961) which means that the “work of adhesion” becomes negative. Similarly to the case of adhesion, the interaction range of these forces can be either comparable (or larger) t...

Electrification of Urban Freight Transport – a Case Study of the Food Retailing Industry

Martins-Turner, Kai ; Grahle, Alexander ; Nagel, Kai ; Göhlich, Dietmar (2020)

Decarbonisation is a major challenge for the coming decades, for all industries, including the transport sector. Battery electric vehicles are a potential solution for the transport sector to reduce its carbon impact. Asides from the question whether there is sufficient supply of electric vehicles for freight transport, it is also unclear whether battery-powered trucks meet the practical requir...

Numerical and experimental investigation of the assessment of rail damper parameters with a new lab-scaled model

Jahan Tigh Kuchak, Alireza (2020)

One of the major problem in the development of railway network is track noise. Control of the noise pollution is an important environmental concern in urban areas. Rolling noise is one of the major sources of noise, and rail dampers as an extra installed-mass on the rail are a common method to reduce the rail vibration and consequently rail noise. In most cases, the experimental results from fi...

On the discretization of a bistable cantilever beam with application to energy harvesting

Noll, Max-Uwe ; Lentz, Lukas ; Wagner, Utz von (2019)

A typical setup for energy harvesting is that of a cantilever beam with piezoceramics excited by ambient base vibrations. In order to get higher energy output for a wide range of excitation frequencies, often a nonlinearity is introduced by intention in that way, that two magnets are fixed close to the free tip of the beam. Depending on strength and position of the magnets, this can either resu...

Case Study on Aircraft Noise Reduction by Variation of Departure Profiles during Night Flights

Mitzkat, Mathias ; Strümpfel, Christoph (2020-02-12)

Since the civil air transportation sector has been growing significantly, with an increase not only in number of flights, but also with regards to their environmental impact, emissions have been growing to the same degree. Residents in areas around airports are therefore exposed to an increasing strain of noise pollution. Past scientific research has identified large potential through the imple...

Heat metering with glycol-water-mixtures

Baack, Sebastian (2020)

Due to its physical properties, glycol-water-mixtures cause typical heat meters to measure with increased deviations. Both the volume flow measurement and the fluid’s heat coefficient are affected. For the determination of the exchanged energy, for example in cooling or solar thermal installations, heat meters which are suitable for commonly used glycol-based heat conveying media are necessary....

Coupling and computation of electromagnetism and mechanics

Abali, Bilen Emek (2019-09-04)

Accurate coupling of electromagnetism and mechanics is of interest in computations of transducers such as piezoelectric, pyroelectric, electromagnetic sensors and actuators. Balance equations in mechanics as well as the MAXWELL equations for electromagnetism have been established in science. However, if the coupling between these governing equations are necessary, several difficulties arise. He...

Thin‐layer inertial effects in plasticity and dynamics in the Prandtl problem

Georgievskii, Dmitri V. ; Müller, Wolfgang H. ; Abali, Bilen Emek (2019-10-23)

Especially in metal forming, large plastic deformation occurs in thin plates. The problem of compressing dies is analyzed to evaluate the spreading of a thin layer in between. The velocity of dies is a given function in time so that the kinematics of the process is known. This problem can be considered as a generalization of the classical Prandtl problem by taking inertial effects into account ...

Data Mining to Uncover Heterogeneous Water Use Behaviors From Smart Meter Data

Cominola, Andrea ; Nguyen, K. ; Giuliani, Matteo ; Stewart, Rodney A. ; Maier, Holger R. ; Castelletti, Andrea (2019-11-19)

Knowledge on the determinants and patterns of water demand for different consumers supports the design of customized demand management strategies. Smart meters coupled with big data analytics tools create a unique opportunity to support such strategies. Yet, at present, the information content of smart meter data is not fully mined and usually needs to be complemented with water fixture invento...

A note on couette flow of nematic crystals according to the Ericksen–Leslie theory

Rickert, Wilhelm ; Vilchevskaya, Elena N. ; Müller, Wolfgang H. (2019-12-12)

In order to model the flow of nematic crystals, the theoretical framework according to Ericksen and Leslie is applied. The essentials of the theory are compiled and then specialized to Couette flow. The profiles for linear velocity and orientation angle will be computed and, in particular, we shall also study the rise in temperature due to viscous dissipation, which is frequently ignored by mec...

nxControl: Ein Beitrag zum reglergestützten manuellen Fliegen

Schreiter, Karolin (2020)

In der vorliegenden Arbeit wird die Entwicklung des Vorgabereglers nxControl für das longitudinale Lastvielfache nx zur effektiven Unterstützung des manuellen Fliegens von Verkehrsflugzeugen beschrieben. Das Lastvielfache nx ist äquivalent zum Gesamtenergiewinkel und damit zur spezifischen zeitlichen Änderung der Gesamtenergie des Flugzeugs. Das Lastvielfache ist direkt proportional zur Differe...

Beitrag zur Einarbeitung in ereignisdiskrete Simulation zur Neu- und Umplanung von Materialflusssystemen

Schumacher, Bastian Clemens (2020)

Die vorliegende Arbeit zeigt Wege auf, wie Studierende in handelsübliche flexible ereignisdiskrete Simulationsinstrumente zur Durchführung von Simulationsstudien im Anwendungsbereich der Neu- und Umplanung von Materialflüssen eingearbeitet werden können. Materialflüsse in Produktionssystemen werden durch Informationsflüsse gesteuert. Eine Vielzahl an Elementen wie Produkte, Maschinen oder Betr...

Dauerwahrnehmung und Nutzererleben in der Mensch-Computer-Interaktion

Trukenbrod, Anna Katharina (2020)

Im Kontext von Mensch-Computer-Interaktionen wird die Interaktionsdauer häufig als objektiver Indikator für die Effizienz oder die Verständlichkeit eines Systems genutzt. Die Dauer wird jedoch auch vom Nutzer subjektiv wahrgenommen. Vor diesem Hintergrund ist es das Ziel der vorliegenden Arbeit zu untersuchen, (1) wie Nutzer Interaktionsdauern wahrnehmen und (2) wie diese Wahrnehmung mit andere...

Virtual Worlds—Real Decisions: Model- and Visualization-based Tools for Landscape Planning in Switzerland

Walz, Ariane ; Gloor, Christian ; Bebi, Peter ; Fischlin, Andreas ; Lange, Eckart ; Nagel, Kai ; Allgöwer, Britta (2008-05)

Prominent construction projects in Switzerland, such as the Sawiris luxury resort in Andermatt planned by Orascom Hotels & Development, Cairo (Egypt), or the idea of a hotel and apartment tower at Schatzalp, Davos, demonstrate how rapidly Alpine landscapes may undergo major changes. Decisions on whether or not such changes are supported by policymakers should be based on the best information av...

Mechanical Properties Characterization of Welded Automotive Steels

Javaheri, Ehsan ; Lubritz, Janot ; Graf, Benjamin ; Rethmeier, Michael (2019-12-18)

Among the various welding technologies, resistance spot welding (RSW) and laser beam welding (LBW) play a significant role as joining methods for the automobile industry. The application of RSW and LBW for the automotive body alters the microstructure in the welded areas. It is necessary to identify the mechanical properties of the welded material to be able to make a reliable statement about t...

Performance metrics for ultrasound-guided needle placements, using a conventional monitor and an augmented reality head-mounted display

Rüger, Christoph (2019)

Purpose Augmented reality (AR) and head-mounted displays (HMD) are current subjects of investigation in medical practice. A commonly proposed use-case of AR-HMDs is to display data in image-guided interventions. Although technical feasibility has been thoroughly shown, effects of AR-HMDs on interventions are not yet well researched, hampering clinical applicability. Therefore, the goal of this...

Using Multi-Agent Transport Simulations to Assess the Impact of EV Charging Infrastructure Deployment

Márquez-Fernández, Francisco J. ; Bischoff, Joschka ; Domingues-Olavarría, Gabriel ; Alaküla, Mats (2019-08-08)

Over the last two decades, electrification has gained importance as a means to decarbonise the transport sector. As the number of Electric Vehicles (EVs)increases, it is important to consider broader system aspects as well, especially when deciding the type, coverage, size and location of the charging infrastructure required. In this article, a Multi-Agent model depicting long distance transpor...

Self-Sensing Control for Soft-Material Actuators Based on Dielectric Elastomers

Hoffstadt, Thorben ; Maas, Jürgen (2019-12-13)

Due to their energy density and softness that are comparable to human muscles dielectric elastomer (DE) transducers are well-suited for soft-robotic applications. This kind of transducer combines actuator and sensor functionality within one transducer so that no external senors to measure the deformation or to detect collisions are required. Within this contribution we present a novel self-sens...

Precise Relative Navigation and Separation Assurance of UAS and Manned Aircraft during Low Altitude Airfield Operations

Schuster, Eric ; Strümpfel, Christoph ; Huschbeck, Svenja ; Göbel, Bastian ; Berth, Christian ; Uijt de Haag, Maarten (2020-01-05)

This paper discusses the flight test setup and preliminary results of a precise relative navigation and separation assurance system to support safe simultaneous operation of general aviation aircraft and UAS at low altitudes in the vicinity of an uncontrolled airfield. With an increased use of UAS for a wide variety of applications, such as law enforcement, search and rescue, agriculture, infra...

Assured Multi-Mode Navigation for Urban Operations of Small UAS

Strümpfel, Christoph ; Schuster, Eric ; Huschbeck, Svenja ; Berth, Christian ; Uijt de Haag, Maarten (2020-01-05)

The paper discusses the preliminary analysis of an urban availability tool required for preflight flight planning. In this tool, areas in an urban environment are assessed with respect to GNSS availability, separation to traffic and obstacles, impact of UAS noise, and various other criteria. GNSS availability will drive the necessity to include alterna-tive navigation sensors such as laser scan...