November 1, 2016 Thesis Open Access

Aklilu Bekele

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    "description": "<p>The purpose of this thesis is concerned with the comparison of FLT and RHEDA2000 ballast-less Track-form with respect to their dynamic performances. The comparison is done based on the analysis of the simulation results and it would be achieved via FEM software (ABAQUS). The analysis have been done in time domain at various Speed of the moving Load and the mode of vibration as well as natural frequencies of both track-forms were extracted from frequency domain analysis.<br>\nThe analysis is done by varying the speed of the rotating wheel from 120 to 420 Km/hr and keeping track stiffness\"s constant. As the speed of the moving load increases from 120 to 420 Km/hr, the vertical displacement of the rail in FLT is increasing to nearly 8mm, in contrast the vertical displacement of Rheda2000 is slightly increasing to 3mm throughout their time domain. With similar manner, the comparisons of these Tracks\" with respect to peak value of stresses variation on the Rail have been done and in FLT this value vary from 130Mpa to 250Mpa in its time domain. Then again, the maximum stresses on Rheda2000 ballast-less Track varies from 136Mpa to 160Mpa in its\" time domain. Besides, it is possible to understand that the vertical acceleration level of Rail in FLT is comparatively less than the vertical acceleration of Rail in Rheda2000 ballast-less Track. The maximum acceleration level of Rail in FLT is 70m/s2 and maximum acceleration level of Rail in Rheda2000 is about 200m/s2.</p>", 
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    "title": "Comparison of Floating Ladder Track and RHEDA2000 Ballast-less Track for Dynamic responses", 
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