Sökning: "track geometry"

Visar resultat 1 - 5 av 43 avhandlingar innehållade orden track geometry.

  1. 1. Optimization of track geometry maintenance a study of track geometry degradation to specify optimal inspection intervals

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Iman Arasteh khouy; [2011]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Drift och underhållsteknik; Operation and Maintenance;

    Sammanfattning : Railway infrastructure is a complex system which comprises different subsystems. Long useful life span is one of the important aspects of this prime mode of transport. The useful life length of its assets is highly dependent on the maintenance and renewal strategy used during its life cycle. LÄS MER

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

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Kalle Karttunen; [2012]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; rolling contact fatigue; track maintenance; track irregularities; wear; multibody dynamics simulations; Railway track geometry;

    Sammanfattning : 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. LÄS MER

  3. 3. Predictive Models for Railway Track Geometry Degradation

    Detta är en avhandling från Luleå : Luleå University of Technology

    Författare :Iman Soleimanmeigouni; Alireza Ahmadi; Nalinaksh S. Vyas; [2019]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Data-driven models; Degradation; Inspection; Maintenance; Predictive analytics; Tamping; Track geometry; Railway infrastructure; RAMS; Drift och underhållsteknik; Operation and Maintenance;

    Sammanfattning : Railways are a vital and effective means of mass transportation and play a vital role in modern transportation and social development. The benefits of the railway compared to other transportation modes are a high capacity, high efficiency and low pollution, and owing to these advantages, railways are nowadays experiencing a higher demand for the transportation of passengers and goods. LÄS MER

  4. 4. Railway Track Stiffness Dynamic Measurements and Evaluation for Efficient Maintenance

    Detta är en avhandling från Stockholm : KTH

    Författare :Eric Berggren; Mats Berg; Laurent Schmitt; [2009]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Railway track stiffness; maintenance; soil dynamics; measurement; simulation; vibration; TECHNOLOGY Engineering mechanics Vehicle engineering; TEKNIKVETENSKAP Teknisk mekanik Farkostteknik;

    Sammanfattning : Railway track stiffness (vertical track load divided by track deflection) is a basic parameter oftrack design which influences the bearing capacity, the dynamic behaviour of passing vehiclesand, in particular, track geometry quality and the life of track components. Track stiffness is abroad topic and in this thesis some aspects are treated comprehensively. LÄS MER

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

    Detta är en avhandling från Institutionen för farkostteknik

    Författare :Björn Kufver; [2000]
    Nyckelord :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;

    Sammanfattning : This doctoral thesis summarises and deepens eightpublications on a project concerning railway alignments.The thesis presents an approach to definingequally costlyalignment alternatives. LÄS MER