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 9 of 9 for “"rail track"”.
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Novel monitoring system to diagnose rail track foundation problems
… monitoring system has been developed to diagnose rail track subgrade failures. The portable monitoring system consists of five liquid vertical settlement probes, one piezometer, a small data acquisition system and laptop, and an Internet communication with remote control capabilities. The probes …
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Finite element analysis of railway track under vehicle dynamic impact and longitudinal loads
Impact loads caused by flat spots on railcar wheels impose a major maintenance burden on railroads and can cause severe damage to both railcar and rail track components. In addition, the increasing tractive power of locomotives leads to significant increase in the longitudinal load demand in …
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Fiber Bragg Gratings Strain Sensors for Railway Applications
… infrastructures, such as bridges, oil rigs, and railroads. Due to the reduction in cost of fiber-optic components and systems, fiber optical sensors have been studied extensively for their higher sensitivity, precision and immunity to electrical interference compared to their electrical …
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Discrete Element Modeling of Railway Ballast for Studying Railroad Tamping Operation
… development of Discrete Element Model (DEM) of railway ballast for the purpose of studying the behavior of ballast particles during tamping is addressed in a simulation study, with the goal of optimizing the railroad tamping operation. A comprehensive literature review of applicability of DEM …
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The Application of Doppler LIDAR Technology for Rail Inspection and Track Geometry Assessment
… Ranging) system to measure the speed of a moving rail vehicle in a non-contacting manner is extended to capture 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 …
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Thermomechanical and Vibrational Fatigue Life Assessment of Railway Wheels
Rail wheel failures can lead to derailment of trains, cost lives and billions of dollars to the railway industry. Therefore, it is important to understand the failure behavior of critical components of the train, especially the ones which are exposed to extreme weather conditions. This …
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Design, Modeling and Tests of Electromagnetic Energy Harvesting Systems for Railway Track and Car Applications
… to harvest the mechanical energy present in railcar suspensions and railroad tracks to generate electricity that is suitable for onboard or trackside electronics, using electromagnetic generators. Compact electromagnetic energy harvesters that can be installed onboard railcars or wayside on …
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Investigación sobre el comportamiento de los distintos tipos de balasto ante la aplicación de los criterios de las diferentes normativas
… sobre el vuelo del balasto. At present the railroad is one of the systems of transport in continue development and expansion, due to the new requirements, the different administrations of the different countries have come adapting the norms to the new requirements. In case of Spain, as …
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The Analysis and Creation of Track Irregularities Using TRAKVU
The accuracy of the results from a rail vehicle 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 …