Renewal of a fixed railway track using UHPFRC - first use worldwide of UHPFRC in rail track construction, part 1

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Weight and Efficiency Optimized DC/DC Converter based on Multiple Interleaved Channels

Alfred Rufer, Yannick Louvrier

Today, energy saving is one of the main objectives for engineers. In the case of mobile applications, energy can be saved by two different ways. First, decreasing the total masse of the system, and second, increasing the efficiency of the overall system. T ...

2011

Comportement du ballast sous l'action du bourrage et du trafic ferroviaire

Chiara Paderno

The geometry of the railway track is degraded under traffic load, and must be maintained periodically. This degradation is due to the arrangement of ballast particles under loads and vibrations, which results into irreversible plastic settlements. Tamping ...

EPFL2010

Performance and Coherence in Network Industries

Matthias Finger, Marc Laperrouza, Nicolas Crettenand, Christof Lorenz Duthaler

Network industries, such as electricity, railways and air transport, are very complex technical, economic, and political systems in which the interplay of technology and institutions has a significant impact on performance. While the performance of the net ...

2010

Modelling degradation processes of switches & crossings for maintenance & renewal planning on the Swiss railway network

Willem-Jan Zwanenburg

Approximately 25 percent of the budget for the maintenance and renewal of railway tracks –in Switzerland more than a billion Swiss Francs– is used for the switches (points) and crossings (S&C). While in the mean time the budget expenditure for the maintena ...

EPFL2009

Defining Degradation Processes of Switches Crossings for Maintenance Renewal Planning

Willem-Jan Zwanenburg

Approximately 25 percent of the budget for the maintenance and renewal of railway tracks is used for the switches (points) and crossings (S&C). While in the mean time the budget expenditure for the maintenance and renewal of plain track is optimized with e ...

2008

Reinforced concrete bridges under increased railway traffic loads : fatigue behaviour and safety measures

Andrin Herwig

The aim of this thesis is to provide rational engineering methods for the fatigue safety examination of existing railway bridges. Increasing railway traffic loading and enhanced structural analysis allow for higher exploitation of the capacity of bridge el ...

EPFL2008

Accurate fatigue stress determination in concrete railway bridges considering rail track - structure interaction

Eugen Brühwiler, Andrin Herwig

So-called “non-load bearing” parts of (railway) bridges increase the stiffness and decrease the stresses in short span bridge structures. The rail track, consisting of ballast, sleepers and rails, has a non-linear behaviour and its rigidity depends on the ...

2006

Multisource DC-DC converter for the supply of hybrid multilevel converter

Alfred Rufer

The asymmetrical multilevel inverters allow to obtain a high resolution together with a good efficiency thanks to the switch hybridization. Nevertheless, the supplies of the cells must be insulated one from each other, which increases the converter complex ...

2006

Alimentation d'onduleurs multiniveaux asymétriques : analyse des possibilités de réalisation et méthodes de répartition de la puissance

Martin Veenstra

The investigated asymmetrical multilevel inverters consist of series-connected inverter cells with different characteristics. They allow to obtain a very good output-voltage resolution. The feeding of the cells is a delicate point which can increase the in ...

2004

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Alimentation d'onduleurs multiniveaux asymétriques : analyse des possibilités de réalisation et méthodes de répartition de la puissance

Martin Veenstra

2004