Sökning: "ballast track"

Visar resultat 21 - 25 av 29 uppsatser innehållade orden ballast track.

  1. 21. Equivalent Dynamics Model of Ballasted Track Bed

    Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Författare :Said Daoud; Xie Guowei; Liu Xiaoming; [2012]
    Nyckelord :ABAQUS; Ballast; modeling; simulation; train-track; fracture mechanics;

    Sammanfattning : Increase of track maintenance costs and change of track geometry are due to the vibration of ballasted railway. The aim of this thesis work is to model train-track system as a multiply degree of freedom systems by Lump Parameter Method. LÄS MER

  3. 22. 3D-models of railway track for dynamic analysis.

    Master-uppsats, KTH/Transportvetenskap

    Författare :Huan Feng; [2011]
    Nyckelord :track dynamics; railway track modelling; finite element analysis; receptance;

    Sammanfattning : In recent decades, railway transport infrastructures have been regaining their importance due to their efficiency and environmentally friendly technologies. This has led to increasing train speeds, higher axle loads and more frequent train usage. LÄS MER

  4. 23. Failure analysis of railway switches and crossings for the purpose of preventive maintenance.

    Master-uppsats, KTH/Transportvetenskap

    Författare :Seyedahmad Jalili Hassankiadeh; [2011]
    Nyckelord :Turnout; Rail; Sleeper; Ballast; Sub grade; Failure Mode and Effect Analysis FMEA ; Rectification; Risk Priority Number RPN ; ;

    Sammanfattning : In the Swedish railway network there are about 12000 units of track switches and crossings, which at 13000 Km, make up about 5.5 percent of the total track length. However, the maintenance cost for S&C is more than 13 percent of the total maintenance cost which is high in comparison with their proportion. LÄS MER

  5. 24. Parametric study of bridge response to high speed trains, ballasted track on concrete bridges

    Master-uppsats, KTH/Bro- och stålbyggnad

    Författare :Shahbaz Rashid; [2011]
    Nyckelord :Ballast stiffness; transition zones; Railway bridges; the Swedish X2000 train; vertical deck acceleration; MATLAB-ABAQUS model; Finite element analysis.;

    Sammanfattning : When a train enters a bridge, passenger sitting inside will feel a sudden bump in the track, which not only affect the riding comfort of the passengers but also put a dynamic impact on the bridge structure. Due to this impact force, we have very serious maintenance problems in the track close to the bridge structure. LÄS MER

  7. 25. Train-Bridge Interaction on Freight Railway Lines

    Uppsats för yrkesexamina på avancerad nivå, KTH/Bro- och stålbyggnad

    Författare :Davide Martino; [2011]
    Nyckelord :train-bridge interaction; dynamics; acceleration; freight train models; track models;

    Sammanfattning : This study investigates the dynamic response of a railway bridge under train passage. Three load models designed around the Swedish Steel Arrow freight train are tested and compared. A series of Concentrated Forces, a succession of single degree of freedom Sprung-Masses, and a sequence of complex multi-degree of freedom Train Wagons. LÄS MER