Search for dissertations about: "Railway track"

Showing result 11 - 15 of 134 swedish dissertations containing the words Railway track.

2. 11. Mechanical track deterioration due to lateral geometry irregularities

   Author : Kalle Karttunen; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; rolling contact fatigue; track maintenance; track irregularities; wear; multibody dynamics simulations; Railway track geometry;

   Abstract : This thesis deals with how a degraded track geometry influences further degradation of the geometry and the formation of rolling contact fatigue (RCF) and wear of rails. The overall objective is optimisation of railway maintenance. For this, further understanding and quantification of the deterioration of track components are needed. READ MORE

4. 12. Data-driven models for railway track geometry maintenance

   Author : Hamid Khajehei; Alireza Ahmadi; John Andrews; Luleå tekniska universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Data-driven models; degradation; maintenance; tamping; track geometry; planning and scheduling; railway infrastructure; Drift och underhållsteknik; Operation and Maintenance;

   Abstract : Railways are currently experiencing higher demands on safety, infrastructure performance, network capacity and service quality, etc. As a result, a high level of track availability, service quality and infrastructure robustness against unexpected events is required, at reduced cost, to meet the demands. READ MORE

5. 13. Optimisation of horizontal alignments for railways - Procedures involving evaluation of dynamic vehicle response

   Author : Björn Kufver; KTH; []
   Keywords : Railway; track geometry; alignment; cant; climbing ratios; clothoids; guiding forces; passenger comfort; Pct; superelevation ramps; simulation; track shift forces; track vehicle interaction; transition curves; vehicle dynamics; wheel rail forces;

   Abstract : This doctoral thesis summarises and deepens eightpublications on a project concerning railway alignments.The thesis presents an approach to definingequally costlyalignment alternatives. READ MORE

6. 14. Sound attenuation in railway track

   Author : Robert Hildebrand; KTH; []
   Keywords : ;

   Abstract : .... READ MORE

7. 15. Wheel–Rail Impact Loads and Track Settlement in Railway Crossings

   Author : Xin Li; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; vehicle--track dynamics; wheel--rail contact; track settlement; material modelling of ballast; Switches and crossings; turnout; cyclic loading; Green s functions;

   Abstract : Turnouts (Switches & Crossings, S&C) are critical components of a railway track requiring regular maintenance and generating high life cycle costs. A main driver for the high maintenance costs is the need to repair and replace switch rails and crossings as these components are subjected to a severe load environment. READ MORE