Dynamic rail longitudinal stress measuring system
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United States of America Patent
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-
Aug 30, 1994
Grant Date -
N/A
app pub date -
Jun 2, 1992
filing date -
Jun 2, 1992
priority date (Note) -
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Abstract
A system and method for dynamically and non-destructively measuring the longitudinal stresses in a rail of a continuous rail track includes an ultrasonic transmitter which transmits coded focused shear pulses through a rail which are subsequently received by a linear array of sensors. A displacer adjusts the separation between the transmitter and the sensors to maximize the signal intensity received by a centrally located one of the sensors. A data processor, in conjunction with a rail height detector, a rail temperature detector, and a rail splice detector, dynamically determines the longitudinal stresses in the rail as a function of the velocity of propagation of the pulses, the stress free temperature (SFT) of the rail, and activates a rail marker to mark portions of the rail having unacceptable longitudinal stresses. Stress and related data is recorded on a data log. A video camera provides observed rail separation data to the data processor. A modified embodiment alters the angle of incidence of the transmitted pulses to adjust for changes in velocity of propagation caused by changes in longitudinal stress.
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