Inst. Land- und Seeverkehr (ILS)

132 Items

Recent Submissions
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...

Wollen wir Europa wirklich?

Heinze, G. Wolfgang (1987)

Man denkt an Friedrich List: an Verkehrsintegration, die Vergröße-rung eines Wirtschaftsraumes und hemmenden Zunftgeist. Auch jetzt wankt eine betagte Marktordnung. 56 Jahre alt und mit großen Verdiensten in schweren Zeiten. Aber es gehört zum Schicksal von Festungen, durch neue Techniken zu Belastungen zu werden und als Museen, Depots und Haftanstalten zu enden. Wie also lauten 1987 die Standa...

Benchmarking minimum passenger waiting time in online taxi dispatching with exact offline optimization methods

Maciejewski, Michał (2014)

This paper analyses the use of exact offline optimization methods for benchmarking online taxi dispatching strategies where the objective is to minimize the total passenger waiting time. First, a general framework for simulating dynamic transport services in MATSim (Multi-Agent Transport Simulation) is described. Next, the model of online taxi dispatching is defined, followed by a formulation o...

Multi-agent transport simulations and economic evaluation

Nagel, Kai ; Grether, Dominik ; Beuck, Ulrike ; Chen, Yu ; Rieser, Marcel ; Axhausen, Kay W. (2008)

Tolls are frequently discussed policies to reduce traffic in cities. However, road pricing measures are seldom implemented due to high investments and unpopularity. Transportation planning tools can support planning authorities by solving those problems if they take into account the following aspects: – Demographic attributes like income and time constraints – Time reactions to the policy – ...

Vergleichende Beschreibung im Verkehr am Beispiel des differenzierten Stadtschnellbahnverkehrs in Ballungsräumen

Blome, Christian (2017)

Der Öffentliche Personennahverkehr unterliegt zeitlich schwankender Nachfrage. In Zeiten erhöhter Nachfrage wird zur Befriedigung der Verkehrsbedürfnisse das Angebot ausgeweitet. Übliche Mittel dazu sind einerseits der Einsatz von Formationen mit größerer Kapazität, soweit dies systemtechnisch möglich ist, und andererseits eine Verdichtung des Fahrtenangebotes. Diese klassischen Verdichtungspri...

Verkehr schafft Verkehr : Ansätze zu einer Theorie des Verkehrswachstums als Selbstinduktion

Heinze, G. Wolfgang (1979)

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Determination of the isentropic turbine efficiency due to adiabatic measurements and the validation of the conditions via a new criterion

Zimmermann, Rainer ; Baar, Roland ; Biet, Clemens (2016)

The determination of the isentropic turbine efficiency under adiabatic and SAE boundary conditions is studied in this paper. The study is structured into two parts. The first part describes the possibility of measuring the isentropic turbine efficiency directly. Normally this is not possible in measurements conducted following the SAE J922 guidelines. Therefore, the experiments have been carrie...

Bidirectional flow measurement based on the differential pressure method for surge analysis on a small centrifugal compressor

Werner, Moritz ; Baar, Roland ; Haluska, P. ; Sandor, I. (2016)

To obtain a high temporal resolution of mass flow data, a flowmeter based on the differential pressure method has been developed. It is capable of detecting negative flow for investigations of dynamic effects in small centrifugal compressors used for turbocharging automotive internal combustion engines. Experiments were performed at a hot gas test bench focusing on the surge characteristics at ...

Validation of simulation models in the context of railway vehicle acceptance

Polach, Oldrich ; Böttcher, Andreas ; Vannucci, Dario ; Sima, Jürgen ; Schelle, Henning ; Chollet, Hugues ; Götz, Gernoth ; Garcia Prada, Mayi ; Nicklisch, Dirk ; Mazzola, Laura ; Berg, Mats ; Osman, Martin (2015)

The evaluation of a reliable validation method, criteria and limit values suitable for model validation in the context of vehicle acceptance was one of the objectives of the DynoTRAIN project. The presented investigations represent a unique amount of testing, simulations, comparisons with measurements, and validation evaluations. The on-track measurements performed in four European countries in...

Akustik wälzgelagerter Abgasturbolader

Biet, Clemens (2017)

Im Rahmen dieser Arbeit wurde die Wälzlagerung für Abgasturbolader mit besonderem Blick auf das akustische Verhalten experimentell untersucht. Die Motivation entstand aus dem theoretischen Potenzial dieser Innovation, welche durch die Verringerung der Reibleistung sowohl Vorteile im transienten als auch im stationären Betrieb ermöglicht. Der Fokus auf die Akustik resultiert aus der Herausforder...

Einfluss von Preissystemen auf die Verbindungsauswahl im Eisenbahnfernverkehr

Friedrich, Johannes (2017-04-10)

Die vorliegende Arbeit ergründet den Zusammenhang zwischen der Tarifierung und der Anzahl für Fahrgäste relevanter Verbindungen im Eisenbahnfernverkehr. Nach einer Abgrenzung des Untersuchungsraums auf Deutschland und wesentliche Strecken des angrenzenden europäischen Auslands sowie des Untersuchungsgegenstands auf Eisenbahn-Fernverkehre werden die wesentlichen Merkmale der Auswahl von Verbind...

Mitigating negative transport externalities in industrialized and industrializing countries

Agarwal, Amit (2017)

The ongoing urbanization process all around the globe is likely to increase transport-related negative externalities e.g., congestion, air pollution, climate change etc. The situation is severe in rapidly expanding cities where the demand for motorized transport is increasing. This has increased the pressure on the policy makers to devise policies to tackle the problem. Derived from the urbaniz...