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MEASUREMENT, SIMULATION, AND ANALYSIS OF THE MECHANICAL RESPONSE OF RAILROAD TRACK

Enviado: 08 Set 2016, 16:48
por Manuela
Autor: Curt Greisen

Orientador: Professor Shane M. Farritor

Instituição: University of Nebraska
Departamento: Mechanical Engineering
Cidade: Lincoln, Nebraska
Ano: 2010.

Abstract:
Increased railroad traffic volumes, speeds, and axle loads have created a need to
better measure track quality. Previous research has indicated that the vertical track
deflection provides a meaningful indicator of track integrity. The measured deflection
can be related to the bending stresses in the rail as well as characterize the mechanical
response of the track.
This investigation summarizes the simulation, analysis and development of a
measurement system at the University of Nebraska (UNL) to measure vertical track
deflection in real-time from a car moving at revenue speeds. The UNL system operates
continuously over long distances and in revenue service. Using a camera and two line
lasers, the system establishes three points of the rail shape beneath the loaded wheels and
over a distance of 10 ft. The resulting rail shape can then be related to the actual bending
stress in the rail and estimate the track support through beam theory.
Finite element simulations are used to characterize the track response as related to
the UNL measurement system. The results of field tests using bondable resistance strain
gages illustrate the system’s capability of approximating the actual rail bending stresses
under load.