Measuring and testing – Vibration – By mechanical waves
Patent
1991-09-11
1994-01-04
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73600, 73634, 73639, G01N 2908, G01N 2918, G01N 2920
Patent
active
052750515
ABSTRACT:
A method and system for nondestructively testing in a continuous sequence a multiplicity of railroad track crossties of wood or concrete to determine the condition and life expectancy of each of the crossties and of the track as a whole. The system includes an electric pulse generator and a pair of transmitting and receiving transducers, which transducers are adapted to be brought into moving contact with the crossties at respective locations straddling desired test regions thereof, for example, the regions under a tie plate, for sending sonic mechanical pulses through that region of the crosstie from one transducer to the other. If desired, three pairs of transducers may be provided for simultaneously straddling both tie plates and a medial reference zone on each crosstie. The transducers and the pulse generator are carried by a vehicle riding on the track rails, along with a computer for processing/evaluating/storing/reproducing the test data. Devices for sensing the presence of each crosstie, for sweeping the same clear of ballast and debris at each of the transducer contact locations, and for marking each crosstie determined to be defective are also provided on the vehicle.
REFERENCES:
patent: 4593569 (1986-06-01), Joy
patent: 4932618 (1990-06-01), Davenport et al.
"PANLOGGER.RTM. A Revolutionary New Device to Test Timber Sleepers in Track", Brochure by Pandrol Limited, 1989, pp. 1-2.
"James V-Meter Material Testing", Brochure by James Instruments Inc. Nondestructive Testing Systems, pp. 1-4.
"USL 33 Low Frequency Ultrasonic Instrument with High Penetration Power", Brochure by Krautkramer--A Krautkramer Branson Company, Apr. 1986, pp. 1-6.
Finley Rose M.
Holler Norbert P.
Tiescan, Inc.
Williams Hezron E.
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