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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"Track Geometry"”.
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The Application of Doppler LIDAR Technology for Rail Inspection and Track Geometry Assessment
… the lateral and vertical irregularities of the track itself and to evaluate the rail track quality. Using two pairs of lenses to capture speed signals from both rails individually, the track speed, curvature, and lateral and vertical geometry variations on each side are determined. LIDAR lenses …
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Multi-Function LIDAR Sensors for Non-Contact Speed and Track Geometry Measurement in Rail Vehicles
… and distance is a critical part of monitoring track geometry conditions. Wheel-mounted tachometer speed measurements often fluctuate due to wheel vibrations, change in wheel diameter, or wheel slip affecting the measurement accuracy. Frequent calibrations are needed to account for changes in …
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Statistical Characterization of Vehicle and Track Interaction Using Rail Vehicle Response and Track Geometry Measurements
… interaction between rail vehicles and the track on which they travel. The measurements were analyzed in the time and frequency domain. The effects of external parameters such as the vehicle design, subgrade stiffness, and degree of curvature were analyzed and compared for both the vehicle …
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Railway track condition change detection: A data-driven approach to track geometry and component degradation modeling
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-12-01
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Evaluation of a methodology for detecting railroad track geometry anomalies and determining rail vehicle fatigue loads
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1993.
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Application of Multifunctional Doppler LIDAR for Non-contact Track Speed, Distance, and Curvature Assessment
… sensors as non-contact means for measuring track speed, distance traveled, and curvature. Speed histories, currently measured with a rotary, wheel-mounted encoder, serve a number of useful purposes, one significant use involving derailment investigations. Distance calculation provides a …
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Mitigation of differential movements at railroad bridge transition zones
Railroad transitions are track locations that experience a rapid change in track structure, such as a bridge or crossing. These locations are prone to differential movement and require frequent resurfacing to maintain an acceptable track geometry for both passing freight and high-speed passenger …
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Railway ballast permeability
… structural and drainage component of railroad track, but is known to degrade over time. This progressive degradation increases the amount of finer particles within the ballast over time, called fouling material, which decreases its drainage capacity and strength. Railroads commonly remove the …
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The Analysis and Creation of Track Irregularities Using TRAKVU
… dynamic model is dependent on the realism of the track input to the model. An important part of the track input is the irregularities that exist on actual track. This study analyzes the irregularities inherent in railroad track geometry data, and provides an analytical method for creating track …
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Performance of Fouled Railroad Superstructure Subjected to Traversing Heavy Haul Trains
… which lead to surface deviation of the railroad tracks. Correspondingly, railroad maintenance is necessary to sustain track geometry alignment and to prevent deterioration of the sub-structure over time, which can increase operating costs significantly. Therefore, this thesis evaluates the …
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Effect of Wheel and Rail Conditions on Contact Dynamics and Mechanics
… Furthermore, the study explores how curved-track geometry affects the wheel-rail contact patch through pressure-sensitive film tests and CONTACT (software) simulations. Both conformal and two-point contacts are analyzed in experiments and simulations, showing similar contact shapes. The …
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Integrated computational and experimental framework for the assessment of railroad ballast life-cycle behavior
… gradation, is an essential layer in the railroad track substructure. Functions of ballast include facilitating load distribution and drainage, maintaining track geometry and track stability, and providing track resilience and noise absorption. Throughout its service life, ballast goes through …
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Class III / short line system inventory to determine 286,000 lb (129,844 kg) railcar operational status in Kansas and determination of ballast fouling using ground penetrating radar
… Class III / short line railroad operation and track maintenance costs. Class III railroads earn less than $38.1 million in in annual revenue and generally operate first and last leg shipping for their customers. In Kansas, Class III railroads operate approximately 40 percent of the roughly …
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Development of relationships and trending methodologies for railroad track component and geometry data
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-03-01 without embargo terms
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Rekonstrukce železniční tratě Bludov - Hanušovice mezi km 56,165 a km 59,105 včetně návrhu technologie prací
Bakalářská práce se zabývá úpravou geometrických parametrů koleje a návrhem vhodné skladby železničního svršku v úseku železniční tratě Bludov – Hanušovice. Při návrhu jsou zohledněny stávající objekty a to, propustky, přejezd, nástupiště a mostní objekty. V rámci celé práce je řešen návrh …
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Návrh rekonstrukce traťového úseku Kunovice - Staré Město u Uherského Hradiště v km 0,3 - 2,0
Cílem bakalářské práce je návrh úpravy geometrických parametrů koleje a návrh rekonstrukce železničního svršku v úseku Kunovice - Staré Město u Uherského Hradiště v km 0,3 - 2,0. Úsek začíná napojením na výhybku v železniční stanici Kunovice a končí v železniční stanici Uherské Hradiště. Součástí …