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 19 of 19 for “"Rail vehicle"”.
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Identifiability and parameter estimation in rail vehicle dynamics
Rail vehicle designers and analysts can benefit from the results of vehicle parameter estimation. Using this technique, they can determine the effects of suspension design decisions, and they can reduce the amount of on-track testing required to qualify new designs for service. This work addresses …
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The application of statistical linearization to nonlinear rail vehicle dynamics
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1980.
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The influence of finite bandwidth actuators on rail vehicle active suspensions
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1982.
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Model based methods for sensor fault-tolerant control of rail vehicle traction
… of modem fault-detection methods to electric rail traction drives. Such drives consist of three main components, induction motors, power inverters and the control system. The power electronics are relatively simple so the scope for fault-tolerance is limited, whilst fault-detection techniques …
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Analytical and experimental investigation of a 1/5 scale rail vehicle simulator
Rail vehicle dynamicists Frequently employ roller rigs to study the complex dynamic response of vehicles and trucks. This work presents the analytical and experimental investigation of a one-fifth scale model of a typical North American three-piece Freight truck running on a roller rig. The roller …
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Machine Learning from Computer Simulations with Applications in Rail Vehicle Dynamics and System Identification
… example, modeling a train with a large number of rail vehicles). Since the sampling plan greatly influences the overall accuracy and efficiency of the stochastic predictions, various sampling plans are investigated, and a space-filling Latin Hypercube sampling plan based on the traveling salesman …
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Statistical Characterization of Vehicle and Track Interaction Using Rail Vehicle Response and Track Geometry Measurements
… study evaluates the dynamic 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 …
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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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Nonlinear Investigation of the Use of Controllable Primary Suspensions to Improve Hunting in Railway Vehicles
Hunting is a very common instability exhibited by rail vehicles operating at high speeds. The hunting phenomenon is a self excited lateral oscillation that is produced by the forward speed of the vehicle and the wheel-rail interactive forces that result from the conicity of the wheel-rail contours …
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Investigation of the finite element method for computing wheel/rail contact forces in steady curving
The understanding of rail vehicle steady-state and dynamic curving has increased substantially in the last few years. Contemporary curving models include such nonlinear effects as two-point contact, creep force saturation, and rail flexibility. The usual approximation concerning the contact …
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Active suspension co-design for lateral stability of rail vehicles
Railroad transportation is one of the most cost-effective and energy-efficient modes of land transportation. With an eye toward improving these efficiencies, many efforts have focused on developing high speed railways. Traditionally railways have utilized passive suspension systems, but maintaining …
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Estimations of rail irregularities
Inspection cars that have been used to measure rail irregularities are costly and need operators. This thesis proposes a method to estimate rail irregularities by measuring accelerations of a passenger car instead of direct measurement by using a conventional inspection car. Using a System …
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Multiple model based real time estimation of wheel-rail contact conditions
… issue of low adhesion between the wheel and the rail has been a problem for thedesign and operation of the railway vehicles. The level of adhesion can be influenced bymany different factors, such as contamination, climate, and vegetation, and it isextremely difficult to predict with certainty. …
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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 …
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Monitoring railway rail roughness using on-train vibration measurements
The growth of roughness on the rails of railway tracks is a significant problem that leads to increased noise and vibration emissions that affect residents near the railway. This study is devoted to a novel method of measuring rail roughness to inform maintenance operations. Unlike existing …
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Fault tolerant strategy for actively controlled railway wheelset
Traditionally, solid axle railway wheelsets are stabilised by using passive suspensions on a conventional rail vehicle, but such additional stiffness affects the pure rolling action of the wheelset around the curve. It has been theoretically proven that this design conflict between stability and …
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Analysis on actuator dynamics in active wheelsetcontrol
… control systems, for primary suspensions of the railway vehicles, and the effects of actuator dynamics on the overall active control system. The research is focused on the use of electric–mechanical (EM) actuators and it addresses on two main aspects when designing active control systems for this …
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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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Application of Optical Detection Methods for Top-of-Rail (TOR) Lubricity Evaluation on a Moving Platform for Revenue Service Track
… revenue service track from a moving platform for railroad applications. A literature review is presented that covers the rail vehicle dynamics that drive the need of Top-of-Rail lubrication and directly affect the manner in which the Top-of-Rail Friction Modifiers (TORFM) and flange grease both …