In-flight monitoring of composite structural components such as

Details In-flight monitoring of composite structural components such as In-flight monitoring of composite structural components such as

1983-02-07

1985-06-25

Myracle, Jerry W.

Measuring and testing

Vibration

By mechanical waves

73583, 416 61, G01N 2904, G01M 500

Patent

active

045246203

ABSTRACT:
The apparatus comprises one or more acoustical transducers associated with a particular interchangeable rotor blade for monitoring acoustic emissions emitted by the rotor blade under operating stress. The output of the transducers is connected to a computer associated with the particular aircraft. The transducer output signals are processed by the computer and filtered to allow real time stress return level readings so as to accumulate a count of critical acoustic emissions which are indicative of progressive irreversible structural fatigue or damage to the interchangeable rotor blade.

REFERENCES:
patent: 3713127 (1973-01-01), Keledy et al.
patent: 3744300 (1973-07-01), Fleury
patent: 4106332 (1978-08-01), McKeown
patent: 4297885 (1981-11-01), Hein et al.
patent: 4336595 (1982-06-01), Adams et al.
Burkhardt et al., "Acoustic Methods for Obtaining Barkhausen Noise Stress Measurements", Materials Evaluation, 40, May 1982, pp. 669-675.

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