Crack detecting means for rotor blades of rotary wing aircrafts

Details Crack detecting means for rotor blades of rotary wing aircrafts Crack detecting means for rotor blades of rotary wing aircrafts

1976-04-13

1977-05-31

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

With measuring, testing, signalling or inspection means

416226, B64C 2732

Patent

active

040266605

ABSTRACT:
Rotary wing aircrafts include one or more rotors having a plurality of rotary blades. Each of the rotor blades has crack sensor in the form of an induction coil or conductive wire. The crack sensor is connected with a further induction coil to form a circuit of which inductance is changed when a crack is produced in the associated rotor blade. On a stationary part such as a stationary swash plate of the rotorcraft, there is provided a stationary induction coil which is brought into cyclical and electromagnetical co-operation with the further induction coil on the rotor as the rotor rotates. The stationary induction coil is connected with a load resistor and an oscillator in such a way that cracks in the rotor blades can be detected in the form of a voltage change at the load resistor.

REFERENCES:
patent: 3517900 (1970-06-01), Roussel
patent: 3547555 (1970-12-01), Jensen
patent: 3573520 (1971-04-01), Dorshimer
patent: 3912200 (1975-10-01), Foral
patent: 3981611 (1976-09-01), Jensen

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