Sökning: "Railway catenary"
Visar resultat 1 - 5 av 6 avhandlingar innehållade orden Railway catenary.
1. Enablement of digital twins for railway overhead catenary system
Sammanfattning : Railway has the potential to become one of the most sustainable mediums for passenger and freight transport. This is possible by continuous updates to the asset management regime supporting Prognostics and Health Management (PHM). Railway tracks and catenaries are linear assets, and their length plays a vital role in maintenance. LÄS MER
2. Numerical study on multi-pantograph railway operation at high speed
Sammanfattning : Multi-pantograph operation allows several short electric multiple unit (EMU) trainsets to be coupled or decoupled to adapt to daily or seasonal passenger-flow variation. Although this is a convenient and efficient way to operate rolling stock and use railway infrastructure, pantographs significantly influence each other and even significantly change the dynamic behaviour of the system compared to single-pantograph operation in the same condition. LÄS MER
3. On Design of a Compact Primary Switched Conversion System for Electric Railway Propulsion
Sammanfattning : In this thesis, a compact and light primary switched conversion system for AC-fed railway propulsion is investigated. It is characterized by soft switching of all converter stages and a source commutated primary converter comprising series connected valves. LÄS MER
4. Measures to Enhance the Dynamic Performance of Railway Catenaries
Sammanfattning : The pantograph-catenary system is used in railways to transfer electric power from infrastructure to trainset. As the pantograph slides against the catenary, the contact between the two surfaces is not stable due to stiffness variation, propagating wave and other environmental perturbation, especially at high speeds or in multi-pantograph operation. LÄS MER
5. Increasing Energy Efficiency in Electric Trains Operation : Driver Advisory Systems and Energy Storage
Sammanfattning : Electric traction is the most efficient traction system in the railway transportation. However, due to the expensive infrastructure and high power demand from the grid, the share of electric trains in the railway transportation is still lower than other trains. LÄS MER