Measurement of track modulus from a moving railcar

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George Rangel
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Measurement of track modulus from a moving railcar

Mensagem por George Rangel » 22 Jan 2015, 10:50

Autor: Christopher D. Norman (Norman, C. D.)

Orientador: Professor Shane Farritor

Instituição: University of Nebraska
Departamento: Mechanical Engineering
Cidade: Lincoln, Nebraska
Ano: Maio, 2004
Norman - 2004 .pdf
Abstract:
The safety of vehicles traveling on railroad track is subject to the condition and quality of the track. Track modulus is one of several indicators for the quality and performance of railroad track. It is the ratio of vertical rail deflection and the contact pressure between the rail base and track foundation. Track modulus describes the vertical support condition of the track and is affected by all components of the track structure under the rail. The measurement of track modulus from a moving railcar is difficult because of a lack of a stable reference frame to make the measurements. A stable reference frame was created by measuring the rail displacement with respect to the contact point of the wheel and rail. The sensor system uses a laser based vision system to measure this relative rail displacement. After measuring the rail displacement, a mathematical model is used to calculate track modulus from the sensor measurements. Modeling and simulation of the proposed sensor system is presented. These simulations show the sensitivity and effectiveness of the sensor system. Field-testing of the sensor system was conducted and the results are presented.
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