current practices in railway track analysis and design are reviewed and discussed in this paper. the mechanical behavior of railway track structure comprising of various components has not been fully understood due to the railway track structural complexity. although there have been some improvements in the accuracy of current track design methods in recent decades, there are still considerable...

Times of downturn in economy, tough competition, high costs, and large amounts of capital required for replacements have created growing need for cost cutting measures and for seeking better return on investment. This has also placed an increasing emphasis on maintenance practices to extend the service life of existing railroad bridges. This paper outlines the various factors which playa role i...

The complexity in design and dimensioning of electric traction fixed installations necessitates the development of a methodology for dimensioning based on numerical simulation models. This solution gives faster and more reliable results than those obtained by the empirical and inaccurate methods previously used. A computer aided design tool implementing this methodology is presented in this pap...

The development of electrical railway systems leads to critical power quality problems in the power grid. This paper discusses a kind of half-bridge-based railway power quality compensator system (HBRPQC) that can compensate negative sequence currents, harmonics, and reactive power simultaneously. In order to keep the HBRPQC performance efficient for the different kinds of transformers used in ...

The paper deals with condition monitoring of electric switch machines for railway points. The proposed detection system is based on off-line processing of armature current and voltage sampled as the machine operates a switch of railway tracks. The system, consisting of an algorithm tuned on a model of the machine as both the rails are driven towards their rest positions, allows detection of fau...

The aim of the project is to suggest an investment planning program where the welfare of the society is to be maximized. In order to be able to decide on a wise investment plan, one needs to know the consequences of different choices of power system configurations. Therefore the impacts of different future traffic demands are of interest for a railway power system owner. Since investments are s...

1.1 Railway vehicle virtual prototyping In recent years, knowledge-based new product competition has become the mainstream of manufacturing competitiveness. As an important way to simulate various problems of complex mechanical systems, virtual prototyping technology is being widely used. It supports concurrent engineering and emphasizes the overall product performance, and strives to simulate ...

As railway signalling systems hardware improved from mechanical switches and electrical relays to electronic tubes and semiconductors, the software improved from direct control and event-driven approach to object and agent-oriented programming. This paper aims at the use of agent-oriented programming for railway applications. In order to do that some agent basic concepts such as organizations (...

This paper presents the designing of a power quality compensator to solve the power quality problem of negative-sequence and harmonic currents in high-speed railway traction systems. The proposed power quality compensator is constituted by railway static power conditioner (RPC), two thyristor-controlled reactors and two thyristor-controlled 3filters. The RPC contains two converters which are co...