Fak. 5 Verkehrs- und Maschinensysteme

856 Items

Recent Submissions
Unified Information Access in Product Creation with an Integrated Control Desk

Wrasse, Kevin ; Diener, Holger ; Hayka, Haygazun ; Stark, Rainer (2017)

Customers demand for individualized products leads to a large variety of different products in small series and single-unit production. A high flexibility pressure in product creation is one result of this trend. In order to counteract the pressure, the information steadily increasing by Industry 4.0 must be made available at the workplace. Additionally, a better exchange of information between...

Direct electron irradiation of DNA in a fully aqueous environment. Damage determination in combination with Monte Carlo simulations

Hahn, Marc Benjamin ; Meyer, Susann ; Schröter, Maria-Astrid ; Seitz, Harald ; Kunte, Hans-Jörg ; Solomun, Tihomir ; Sturm, Heinz (2016)

We report on a study in which plasmid DNA in water was irradiated with 30 keV electrons generated by a scanning electron microscope and passed through a 100 nm thick Si3N4 membrane. The corresponding Monte Carlo simulations suggest that the kinetic energy spectrum of the electrons throughout the water is dominated by low energy electrons (<100 eV). The DNA radiation damage, single-strand breaks...

High Speed Cutting of Carbon Fibre Reinforced Plastics

Uhlmann, Eckart ; Richarz, Sebastian ; Sammler, Fiona ; Hufschmied, Ralph (2016)

The effects of high speed cutting (HSC) on metallic workpiece materials have been widely studied and the benefits are commonly employed in the machining industry. However, in the machining of composite materials, these effects have not yet been a focus of significant research work and core questions such as what impact HSC cutting parameters have on tool wear, process forces and workpiece quali...

Towards an Agent-based, Integrated Land-use Transport Modeling System

Ziemke, Dominik ; Nagel, Kai ; Moeckel, Rolf (2016)

This paper reports on initial steps of an integration of the microscopic land-use simulation system SILO (Simple Integrated Land- Use Orchestrator) and the agent-based transport simulation system MATSim (Multi-Agent Transport Simulation). It is shown how information can be transferred from the land-use model to the transport model in an agent-oriented fashion and how MATSim can be used as a tra...

Braess's Paradox in an Agent-based Transport Model

Thunig, Theresa ; Nagel, Kai (2016)

Braess's paradox states that adding a link to the network can increase total travel time in a user equilibrium. In this paper, Braess's paradox is analyzed in the agent-based transport simulation MATSim. It can be observed, that two different types of the paradox occur: In the absence of spill back effects, the delay per agent caused by adding a new link is bounded, i.e. the delay per agent wil...

Agent-based Congestion Pricing and Transport Routing with Heterogeneous Values of Travel Time Savings

Kaddoura, Ihab ; Nagel, Kai (2016)

An existing agent-based simulation framework and congestion pricing methodology is extended towards a consistent consideration of non-linear, user- and trip-specific values of travel time savings (VTTS). The heterogeneous VTTS are inherent to the model and result from each agent's individual time pressure. An innovative approach is presented which accounts for the non-linear, user- and trip-spe...

Simulation of City-wide Replacement of Private Cars with Autonomous Taxis in Berlin

Bischoff, Joschka ; Maciejewski, Michał (2016)

Autonomous taxi (AT) fleets have the potential to take over a significant amount of traffic handled nowadays by conventionally driven vehicles (CDV). In this paper, we simulate a city-wide replacement of private cars with AT fleets of various sizes. The simulation model comprises microscopic demand for all private car trips in Berlin (including incoming and outgoing traffic), out of which the i...

An Elegant and Computationally Efficient Approach for Heterogeneous Traffic Modelling Using Agent Based Simulation

Agarwal, Amit ; Zilske, Michael ; Rao, K. Ramachandra ; Nagel, Kai (2015)

For developing nations, where mixed traffic conditions prevail, it becomes necessary to develop a heterogeneous traffic flow model which is able to model all vehicle types of different static and dynamic characteristics and equally efficient in computational performance. For this purpose, in this study, an agent based framework is used which uses a queue model in its mobility simulation. In fir...

Agent-based Simultaneous Optimization of Congestion and Air Pollution: A Real-World Case Study

Agarwal, Amit ; Kickhöfer, Benjamin (2015)

The exclusion of external costs from the behavioral decision making process of individuals yields travel demand beyond the system optimum which implies inefficiencies in the transport system. The present study investigates the effect of congestion optimization on emissions levels and vice versa while considering heterogeneity in individual attributes and choice behavior. In consequence, the res...

Why closing an Airport May not Matter – The Impact of the Relocation of TXL Airport on the Bus Network of Berlin

Neumann, Andreas (2015)

This paper investigates the closure of TXL airport and its impact on the bus network of Berlin. The results of the scenario are based on a co-evolutionary algorithm for public transit network design. The algorithm is integrated in a multi-modal multi-agent simulation. In the simulation, competing minibus operators start exploring the public transport market offering their services. With more su...

Seepage of Smaller Vehicles under Heterogeneous Traffic Conditions

Agarwal, Amit ; Lämmel, Gregor (2015)

In the direction of complex heterogeneous traffic modeling, the present study proposes a model to simulate the behavior of smaller vehicles in the congested regime called seepage action. As the name suggests, in congested part of links, smaller vehicles like motorbikes and bikes do not stop at the end of queue. Instead, they move continuously across the gaps between the stationary congested veh...

A Simulation-based Approach for Constructing All-day Travel Chains from Mobile Phone Data

Zilske, Michael ; Nagel, Kai (2015)

The purpose of this work is to investigate replacing travel diaries with sets of call detail records (CDRs) as inputs for an agent-oriented traffic simulation. We propose constructing an agent population directly from a CDR dataset and fusing it with link volume counts to reduce spatio-temporal uncertainty and correct for underrepresented traffic segments. The problem of finding a set of travel...

The Working Posture Controller: Automated Adaptation of the Work Piece Pose to Enable a Natural Working Posture

Nguyen, The Duy ; Bloch, Christian ; Krüger, Jörg (2016)

We present a novel approach to prevent awkward working posture by automatically assessing and optimising the work place for a given task. Our system is called the Working Posture Controller (WPC) and enables to accomplish tasks in a natural posture by adapting the pose of work piece to be processed. Unlike other approaches to prevent posture-related Musculo-skeletal Disorders (MSDs), our system...

How to Make People Make a Change – Using Social Labelling for Raising Awareness on Sustainable Manufacturing

Roeder, Ina ; Scheibleger, Matthias ; Stark, Rainer (2016)

Raising awareness on sustainable manufacturing, especially when it comes to low qualified target groups, remains a challenge. After a decade of considerable campaigning work, the majority of German population still does not understand the holistic concept of a sustainable development, let alone its manufacturing aspects. More effective communication methods are required. The main challenge lies...

Adapting Ergonomic Assessments to Social Life Cycle Assessment

Chang, Ya-Ju ; Nguyen, The Duy ; Finkbeiner, Matthias ; Krüger, Jörg (2016)

In Social Life Cycle Assessment (SLCA), the health and safety aspect of workers is usually evaluated by considering the numbers of injuries and accidents; however, the work related musculoskeletal disorders (MSDs), which dominate occupational diseases, are often neglected in SLCA since the effects do not occur immediately. Thus, the MSDs lead to increased working absences and compensation costs...

Advances in Tool Grinding and Development of End Mills for Machining of Fibre Reinforced Plastics

Uhlmann, Eckart ; Schröer, Nikolas (2015)

The extensive use of lightweight construction materials in the aerospace industry poses a great challenge for tool manufacturers. Materials like carbon fibre reinforced plastics (CFRP) are difficult to machine and therefore put high demands on cutting tools in terms of the cutting material as well as the macro- and microscopic design. In this paper two approaches for the improvement of CFRP mil...

Investigation of the Global Mode in Swirling Combustor Flows: Experimental Observations and Local and Global Stability Analysis

Terhaar, Steffen ; Paredes, P. ; Oberleithner, Kilian ; Theofilis, V. ; Paschereit, Christian Oliver (2015)

Self-excited helical flow oscillations are frequently observed in gas turbine combustors. In the present work a new approach is presented tackling this phenomenon with stability concepts. Three reacting swirling flows are investigated. All of them undergo vortex breakdown, but only two of them show self-excited global flow oscillations at well-defined frequencies. The oscillations feature a pre...

Stability Analysis of Time-averaged Jet Flows: Fundamentals and Application

Oberleithner, Kilian ; Paschereit, Christian Oliver ; Soria, Julio (2015)

We report on experimental and theoretical investigations of shear flow instabilities in jet flows. Linear stability analysis is applied to the time-averaged flow taken from experiments, contrasting the ‘classic’ stability approach that is based on a stationary base flow. To some extend, mean flow stability eigenmodes may deal as a model for instability waves at their nonlinearly saturated state...

High Power Laser Beam Welding of Thick-walled Ferromagnetic Steels with Electromagnetic Weld Pool Support

Fritzsche, André ; Avilov, Vjaceslav ; Gumenyuk, Andrey ; Hilgenberg, Kai ; Rethmeier, Michael (2016)

The development of modern high power laser systems allows single pass welding of thick-walled components with minimal distortion. Besides the high demands on the joint preparation, the hydrostatic pressure in the melt pool increases with higher plate thicknesses. Reaching or exceeding the Laplace pressure, drop-out or melt sagging are caused. A contactless electromagnetic weld support system wa...

The Working Posture Controller - automated adaptation of the workpiece pose to enable a neutral working posture

Nguyen, The Duy (2018)

The human worker plays a vital role on the production line. Although modern automation technology has succeeded in replacing much of the workforce in factories, there are scenarios where full automation cannot be realised. For example, enterprises offering a broad portfolio of varying products can often not afford the reconfiguration costs of frequently changing manufacturing facilities. Moreov...