Measuring and testing – Vibration – By mechanical waves
Patent
1992-06-02
1994-08-30
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73610, 73624, 73636, 73639, G01N 2918, G01N 2924
Patent
active
053416830
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.
REFERENCES:
patent: 3364732 (1968-01-01), Sasaki
patent: 3442119 (1969-05-01), Cowan
patent: 3937068 (1976-02-01), Joy
patent: 3962908 (1976-06-01), Joy
patent: 4004455 (1977-01-01), McKee et al.
patent: 4044594 (1977-08-01), Owens et al.
patent: 4165648 (1979-08-01), Pagano
patent: 4167879 (1979-09-01), Pedersen
patent: 4174636 (1979-11-01), Pagano
patent: 4235112 (1980-11-01), Kaiser
patent: 4429576 (1984-02-01), Norris
patent: 4457178 (1984-07-01), Turbe et al.
patent: 4468966 (1984-09-01), Bradshaw
patent: 4662224 (1987-05-01), Turbe
patent: 4689995 (1987-09-01), Turbe
patent: 4700574 (1987-10-01), Turbe
patent: 4932618 (1990-06-01), Davenport et al.
patent: 5020371 (1991-06-01), Panetti
"Measurement of Applied and Residual Stresses Using an Ultrasonic Instrumentation System" by B. E. Gordon, Jr. (ISA Transactions-vol. 19, No. 2) (1980) pp. 33-40.
Finley Rose M.
Williams Hezron E.
LandOfFree
Dynamic rail longitudinal stress measuring system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dynamic rail longitudinal stress measuring system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamic rail longitudinal stress measuring system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-23848