DESIGN OF A SYSTEM TO MEASURE TRACK MODULUS FROM A MOVING RAILCAR

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Manuela
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DESIGN OF A SYSTEM TO MEASURE TRACK MODULUS FROM A MOVING RAILCAR

Mensagem por Manuela » 05 Set 2016, 11:37

Autores: Chris Norman, Shane Farritor, Richard Arnold, S.E.G. Elias, Mahmood Fateh, Magdy El-
Sibaie.

ABSTRACT:
Track modulus is an important parameter in track quality or performance. Modulus is
defined as ratio between the rail deflection and the vertical contact pressure between the rail base
and track foundation. This paper describes the design of a system for on-board, real-time, noncontact
measurement of track modulus.
Measuring track modulus from a moving rail car is non-trivial because there is no stable
reference for the measurements. The proposed system is based on measurements of the relative
displacement between the track and the wheel/rail contact point. A laser-based vision system is
used to measure this relative displacement. A mathematical model is then used to estimate track
modulus.
A mathematical analysis is presented to evaluate the design and sensitivity of the
proposed system. A simulation of a moving railcar is used to show the effectiveness of the
system. Finally, the results of field tests are presented for a slow (< 10 mph ~ 16.1 km/hr)
moving railcar over various sections of track including road crossings, rail joints, and bridges.
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