Measuring and testing – Vibration – By mechanical waves
Patent
1982-03-24
1984-02-14
Birmiel, Howard A.
Measuring and testing
Vibration
By mechanical waves
73660, 73801, G01N 2904
Patent
active
044308965
ABSTRACT:
An apparatus for detecting cracks possibly produced in a workpiece whose distortion is being removed under pressure exerted by a pressing rod of a distortion removing machine. A detection signal produced by a sensor embedded in the pressing rod during a first predetermined period is compared with a first predetermined signal level for determining whether or not the cracking occurs in the workpiece. A detection signal produced by the acoustic emission sensor during a second predetermined period in which the workpiece is subjected to the pressure of the pressing rod without involving cracks is compared with a second predetermined signal level to determine whether or not the detecting apparatus itself operates normally.
REFERENCES:
patent: 4036057 (1977-07-01), Morais
patent: 4344326 (1982-08-01), Kahn
"Utilization of Acoustic Emission for In-Service Inspection", Schofield, Conference on Periodic Inspection of Pressure Vessels, London, England, Institution of Mech. Engineers, May 9-11, 1972, Paper No. S3045 0056, pp. 76-82.
"Acoustic Emission System for Monitoring Components and Structures in a Severe Fatigue Noise Environment," Horak et al., Materials Evaluation, May 1977, pp. 59-63.
Banno Akira
Fujimori Kazuo
Birmiel Howard A.
Toyota Jidosha Kogyo Kabushiki Kaisha
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