Communications: electrical – Selective – Having indication or alarm
Patent
1980-09-11
1982-08-17
Brigance, Gerald L.
Communications: electrical
Selective
Having indication or alarm
244 1711, 416 61, G08B 2100
Patent
active
043452370
ABSTRACT:
The blades of a helicopter propeller are supervised by pressure-sensitive transducers operating a resonance circuit rotating therewith, for determining its frequency. The circuit includes a rotating secondary of a transformer, intermittently coupled to a stationary primary which is energized by a voltage having a frequency equal to the resonance frequency of the resonance circuit when there is no blade defect. An impedance senses the amplitude of these pulses which varies on detuning due to a blade defect. The pulses are processed to yield a warning. Scanning through a range of source frequencies permits identification of the defective blade. The circuit is supplemented for operational testing during flight as well as on the ground.
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Hartwig Siegfried
Lerche Ernst
Raschke Bernward
Brigance Gerald L.
Siegemund Ralf H.
Verenigte Flugtechnische Werke GmbH
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