Global ETD Search
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 13 of 13 for “"Train Speed"”.
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Multi-Function LIDAR Sensors for Non-Contact Speed and Track Geometry Measurement in Rail Vehicles
… is studied for the application of measuring train ground speed in a non-contacting manner, as an alternative to the current train speed measurement devices such as wheel-mounted tachometers or encoders. The ability to accurately measure train speed and distance is a critical part of …
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Dynamic Braking Control for Accurate Train Braking Distance Estimation under Different Operating Conditions
… of Model Reference Adaptive Control (MRAC) for train dynamic braking is investigated in order to control dynamic braking forces while remaining within the allowable adhesion and coupler forces. This control method can accurately determine the train braking distance. One of the critical factors …
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Regional seismic risk of railway system including derailment consequences
… fatality rates for passengers as a function of train speed and includes two sub-models. The first sub-model, which is for the case when the train remains in its own track after derailment, was developed using historical accident data. The casualty and fatality rates are estimated using a linear …
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Field test program of the concrete crosstie and fastening system
… freight tonnages and development of its high speed rail program, the design and performance of concrete crossties and elastic fastening systems must be upgraded. As a part of a study aimed at improving concrete crossties and fastening systems, field experimentation was performed at the …
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Finite element analysis of railway track under vehicle dynamic impact and longitudinal loads
… railway tracks. The capacity of longitudinal restraint of existing rail fastening system and its dependency on track parameters affects the future design of rail fastening system. This thesis focuses on investigating numerically these two problems using finite element (FE) method. An FE model …
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Train-induced dynamic response of railway track and embankments on soft peaty foundations
… magnitudes of displacement of the track under train loading appear to be increasing gradually over time and train speeds have had to be reduced.This thesis is based on the research done to monitor the response of these railway track and embankment structures to dynamic train loading. The …
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Optimal train control on various track alignments considering speed and schedule adherence constraints
… This study presents an approach to optimize train motion regimes for various track alignments, which minimizes total energy consumption subject to allowable travel time, maximum operating speed, and maximum acceleration/deceleration rates. The research problem is structured into four cases …
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Optimal Communications Systems and Network Design for Cargo Monitoring
… seek to offload cargo from ships directly onto trains destined for an inland intermodal traffic terminal. Once at the terminal, the freight can then be processed by Customs and then distributed within the United States. For such an effort to succeed shippers must have "visibility" into rail …
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Task modeling and assessment for human-system interaction in freight rail operations
… Abstraction Hierarchy. This included controlling train speed, train forces, and dispatcher communications, while maintaining awareness of train and signal states, track conditions, and nearby traffic. Hierarchical Task Analysis was used to identify the lower level tasks of the engineer and …
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A Polynomial Chaos Approach for Stochastic Modeling of Dynamic Wheel-Rail Friction
… among others. Simulations are performed at train speed of 20 m/s for 4 sec using rail roughness as a unique excitation source. The dynamic simulation has been performed for the deterministic model and for the stochastic model. The dynamics results of the deterministic model provide the …
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Characterisation of bridge-track interaction of a multi-span viaduct subjected to heavy haul loading
… forces. The research focused on categorizing the trains crossing the ORV into six (A-F) categories; the categorization was based on the train length and the commodities being hauled. The research also studied the speed variations of each train crossing the bridge. The speeds were analyzed using …
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Reliability based live loads for structural assessment of bridges on heavy-haul railway lines
… African iron ore line currently operates long trains of length 4.1km with 30 tonne per axle wagons on a narrow gage (1065mm) line over a distance of 861km. The operation of heavy haul lines require close monitoring and structural performance evaluation of existing bridges. This study covered …
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Dynamic distributed monitoring of masonry railway bridges
… of a damaged masonry viaduct under applied train loading. It is found that the impact of damage on the viaduct response is primarily local, while common ‘single-point’ measurements, such as the crown vertical displacements, can be well matched by the simplified models. Furthermore, relative …