Fak. 5 Verkehrs- und Maschinensysteme

1230 Items

Recent Submissions
Experimentelle und numerische Untersuchung des strukturdynamischen und strömungsmechanischen Verhaltens einer piezoadaptiven Verdichterschaufel zur Strömungsbeeinflussung

Phan, Tien Dat (2019)

In der vorliegenden Arbeit wurde eine Piezo-Elastomer-Adaptive-Verdichterschaufel zur aktiven Beeinflussung instationärer Strömungen aufgrund der periodischen Inzidenzwinkeländerung infolge der zur signifikanten Erhöhung des Gasturbinenwirkungsgrades im Sonderforschungsbereich 1029 untersuchten druckerhöhenden pulsierenden Verbrennung entwickelt. Basierend auf numerischen Voruntersuchungen der...

Data for A Tutorial on the Proper Orthogonal Decomposition

Weiss, Julien (2019-06-19)

Experimental database from AIAA Paper 2019-3333 (A Tutorial on the Proper Orthogonal Decomposition) presented at the AIAA Aviation Conference 2019 in Dallas, Texas, on June 19th, 2019. The database consits of 2D velocity fields measured by PIV that are used to generate the figures in the paper.

A Tutorial on the Proper Orthogonal Decomposition

Weiss, Julien (2019)

This tutorial introduces the Proper Orthogonal Decomposition (POD) to engineering students and researchers interested in its use in fluid dynamics and aerodynamics. The objectives are firstly to give an intuitive feel for the method and secondly to provide example MATLAB codes of common POD algorithms. The discussion is limited to the finite-dimensional case and only requires knowledge of basic...

Toolbox - Transforming the Failure Mode and Effects Analysis for community-based product development

Schwandt, Sophie (2019-06-11)

Open source product development is an arising alternative to standard industrial development practices. Communities of voluntary members engage in decentralized development practices that are open to anyone interested to collaboratively foster innovation. However, the lack of tools and missing knowledge of methods that are standard practice in industrial product development issue challenges for...

Evaluating system of rice intensification using a modified transplanter: A smart farming solution toward sustainability of paddy fields in Malaysia

Shamshiri, Redmond R. ; Ibrahim, Bala ; Balasundram, Siva K. ; Taheri, Sima ; Weltzien, Cornelia (2019-03)

This paper presents the study reports on evaluating a new transplanting operation by taking into accounts the interactions between soil, plant, and machine in line with the System of Rice Intensification (SRI) practices. The objective was to modify planting claw (kuku-kambing) of a paddy transplanter in compliance with SRI guidelines to determine the best planting spacing (S), seed rate (G) and...

Effect of elastic grading on fretting wear

Willert, Emanuel ; Dmitriev, Andrey I. ; Psakhie, Sergey G. ; Popov, Valentin L. (2019-05-24)

We consider fretting wear in elastic frictional contact under influence of oscillations of small amplitude and investigate the question, how wear damage can be influenced by the introduction of material gradients. To achieve a general understanding we restrict our consideration to media with a power-law dependency of the elastic modulus on depth. In this case, a complete analytical solution can...

Numerical prediction of ship manoeuvring performance in waves

Uharek, Sebastian Alexander (2019)

This thesis presents a method to predict rudder manoeuvres of ships in waves, which is purely based on numerical simulations. For this purpose, a mathematical model of Abkowitz type has been expanded to take the forces and moments due to waves into account. Under the assumption that oscillating wave forces and moments of first order do not influence the trajectory of the manoeuvring ship, only ...

Methodische Entwicklung von nachhaltigen Innovationen in Start-Ups als Beitrag zur produktionstechnischen Wertschöpfung

Stock, Tim Erwin (2019)

Im heutigen Zeitalter des Anthropozäns stehen die Industrie-, Schwellen- und Entwicklungsländer vor vielfältigen Nachhaltigkeitsherausforderungen, die durch globale Trends im Handlungsfeld umweltbezogener, gesellschaftlicher und wirtschaftlicher Dimension menschlichen Wirkens hervorgerufen werden. Dazu zählen die steigende sozio-ökonomische Ungleichheit, der Klimawandel, die zunehmende Umweltbe...

Numerical study of the hydraulic excavator overturning stability during performing lifting operations

Mitrev, Rosen ; Marinković, Dragan (2019-05-02)

This article presents a numerical study of the stability of a hydraulic excavator during performing lifting operations. A planar dynamic model is developed with six degrees of freedom, which considers the base body elastic connection with the terrain, the front digging manipulator links, and the presence of the freely suspended payload. Differential equations describing the excavator dynamic be...

Should autonomous shared taxis replace buses? A simulation study

Leich, Gregor ; Bischoff, Joschka (2018)

The introduction of shared autonomous vehicles (SAV) will likely reduce operation cost per vehicle and might thereby allow to enhance conventional public transit systems with numerous small SAVs offering exible ridesharing-like feeder services. These demand-responsive services could replace conventional bus lines limited by their fixed routes and their fixed schedules. This simulation study exp...

Handbook of contact mechanics

Popov, Valentin L. ; Heß, Markus ; Willert, Emanuel (2019-04)

This open access book contains a structured collection of complete solutions of all significant axially symmetric contact problems. It provides solutions for classical profiles such as the sphere, cone or flat cylindrical punch as well as a multitude of other technically relevant shapes, e.g. the truncated cone, the worn sphere, rough profiles, hollow cylinders, etc. Normal, tangential and tors...

Microphone Array Benchmark b11: Rotating Point Sources

Herold, Gert (2017-07-28)

This benchmark case is part of a collection of synthetic and experimental array data sets compiled by the microphone array community for testing and comparing different microphone array methods. It consists of two simulated data sets featuring rotating point sources in a resting medium. Sound pressure time data are generated at 64 microphones, which are arranged evenly on a circle. The data are...

Mobility as a service and the transition to driverless systems

Bischoff, Joschka Felix (2019)

On-demand transport modes have developed over the last decades and are now often integrated into Mobility as a Service (MaaS) systems. Their current scope stretches from classical taxi and paratransit services to ride-hailing and ride-sharing and also includes free-floating car sharing systems. In the future, the ongoing trend towards a sharing-economy and improving autonomous driving capabilit...

Trust in highly automated driving

Stephan, Amelie (2019)

The automotive industry is on the verge of a new technology: self-driving vehicles. Such highly automated driving vehicles are more and more technically feasible, and corporations and research institutes all over the world are investing time and money to bring the once futuristic vision on the road. The technology is developed with the goal to release the driver from the manual task of controll...

Aktive Schwingungstilgung der horizontalen Schwingungen eines landwirtschaftlichen Spritzgestänges

Borchert, Anna-Gret (2019)

Die vorliegende Dissertation befasst sich mit der Optimierung des horizontalen Schwingungsverhaltens eines landwirtschaftlichen Spritzgestänges durch den Einsatz einer aktiven Schwingungstilgung.In Fahrtrichtung auftretende Gestängeschwingungen erzeugen Über- und Unterdosierungen beim Ausbringen von Pflanzenschutzmitteln oder Flüssigdünger. Daraus können ein inhomogener Pflanzenbewuchs und Ertr...

Untersuchung von PIO-Tendenzen bei plötzlichen Umschaltungen in der Flugdynamik

Schönfeld, Andrej (2019)

Bisher wurden Kopplungsphänomene des Gesamtsystems Pilot-Flugzeug (Piloteninduzierte Schwingungen, PIO) nach einer Umschaltung im Flugregelungssystem nur unzureichend systematisch untersucht. In den letzten Jahren traten jedoch einige Vorfälle in der zivilen Luftfahrt auf, die zeigten, dass schwere Vorfälle entstehen können, wenn Umschaltungen der Flugregelungsgesetze involviert sind. Die vorli...

Eine analytisch-numerische Betrachtung zu thermoelastischen Schwingungen von schnelldrehenden Rotoren beim Anstreifen an Bürstendichtungen

Fay, Robert (2019)

Bürstendichtungen brauchen gegenüber den im Turbomaschinenbau meist verwendeten Labyrinthdichtungen einen wesentlich geringeren axialen Bauraum bei gleichem Druckgefälle. Diesen zusätzlichen Bauraum kann der Entwickler nutzen, um seine Maschine zu optimieren - beispielsweise um die Eigenfrequenzen des Systems auf den Betriebsbereich anzupassen. Ein Risiko, welches sich aus dem Einsatz mit Bürst...

Numerical simulation and parametric investigation of the mechanical properties of fabric nap core sandwich

Ha, Giap Xuan (2019)

This research deals with the finite element (FE) simulation and the validation of FE models for a new type of sandwich-structured composite, the so-called nap-core sandwich. The nap-core is made of a two-dimensional knitted fabric impregnated with a thermosetting resin, which underwent deep drawing and curing processes to adopt a permanent three-dimensional shape. The nap-core can be considered...

Methodische Entwicklung einer modularen Lasersintermaschine zur Herstellung von bioresorbierbaren Implantatmatrizen

Kautz, Clemens Kolja (2019)

Eine aus dem Bereich der regenerativen Medizin stammende visionäre Anwendung der AM-Technologie ist die Fertigung von individuell angepassten Implantaten und Organen. Werden zur Herstellung von Implantatmatrizen, dem Gerüst zum Gewebeaufbau, bioresorbierbare Werkstoffe mittels Lasersintern verarbeitet, verbleibt das erzeugte Implantat nach der Transplantation im Körper des Patienten und wird do...

Adhesive Strength of Contacts of Rough Spheres

Li, Qiang ; Pohrt, Roman ; Popov, Valentin L. (2019-03-26)

The adhesive contact between a parabolic indenter with superimposed roughness and an elastic half space is studied in the JKR-limit (infinitely small range of action of adhesive forces) using the boundary element method with mesh-dependent detachment criterion suggested in 2015. Three types of superimposed roughness are considered: one- and two-dimensional waviness and randomly rough roughness....