Search for dissertations about: "Railway Traction Systems"
Showing result 6 - 10 of 12 swedish dissertations containing the words Railway Traction Systems.
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6. Railway Power Supply Models and Methods for Long-term Investment Analysis
Abstract : The aim of the project is to suggest an investment planning programwhere the welfare of the society is to be maximized. In order to beable to decide on a wise investment plan, one needs to know theconsequences of different choices of power system configurations. READ MORE
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7. Effects of top-of-rail friction modifiers on the friction, wear and cracks of railway rails
Abstract : The railway is an economical and environmentally friendly mode of transport for long distances and heavy loads. The demands on the operators are increasing with increased competition in the market, and therefore they are currently demanding more track capacity. In the short term, the existing network is expected to deliver the increased capacity. READ MORE
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8. Combined thermal and mechanical loading of railway wheel treads. A numerical study of material response and cracking under braking conditions
Abstract : The scope of the thesis is prediction of the material response owing to combined thermal and mechanical loading of a railway wheel tread. The long-term objective is to improve models for prediction of surface-initiated Rolling Contact Fatigue (RCF) under the combined effect of mechanical loading due to rolling (and sliding) contact and thermal loading due to braking and/or wheel--rail friction. READ MORE
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9. Multi-conductor transmission line model for electrified railways: A method for including responses of lumped devices
Abstract : For studying the response to transients caused by lightning and other electromagnetic disturbance sources, electrified railway systems can be represented as a system of multiconductor transmission lines (MTL) above a finitely conducting ground. The conductors present in this system would be wires for traction power supply, auxiliary power, return conductors for traction current, the tracks, and finitely conducting ground. READ MORE
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10. A method for including the responses of lumped devices into multi-conductor transmission line model for electrified railways
Abstract : The electrified railway system consisting of overhead lines for traction power supply, auxiliary power, return conductors for traction current and the tracks can be modeled as a system of multiconductor transmission lines (MTL) above a finitely conducting ground. There are several lumped devices connected in series or in parallel along this MTL and the response of the MTL to electromagnetic transients need to be solved along with the device response. READ MORE