Measuring and testing – Vibration – By mechanical waves
Patent
1985-03-11
1986-08-26
Ciarlante, Anthony V.
Measuring and testing
Vibration
By mechanical waves
73646, 73660, 381 71, G01N 2900
Patent
active
046075283
ABSTRACT:
A method of determining in a propeller-driven aircraft a propeller pressure ignal from a combined signal derived from the propeller and from the engine exhaust during flight. Where the propeller driven aircraft is powered by a four-stroke internal combustion engine, pressure signals from the propeller and the engine exhaust coincide where the number of propeller blades corresponds to half the number of cylinders in the engine. In order to determine the clean propeller signal from a propeller/engine exhaust combined signal, a succession of combined signals are detected by means of a microphone arranged on the wing of the aircraft behind the plane of rotation of the propeller. In addition to this, the exhaust signals of the individual engine cylinders are measured at the mouth of the exhaust pipe. Both the combined and the cylinder exhaust signals are recorded synchronously on a multi-track tape recorder. In order to determine the clean propeller pressure time history, the combined and/or cylinder exhaust signals are adjusted to a correct amplitude, similar edges of the combined signals and the cylinder exhaust signals corresponding to respective combined signals are brought into coincidence and the cylinder exhaust signals of the engine are subtracted from the combined signals by electronic means.
REFERENCES:
patent: 3844175 (1974-10-01), Hixson
patent: 4061041 (1977-12-01), Fletcher et al.
Ciarlante Anthony V.
Deutsche Forschungs -und Versuchsanstalt fur Luft -und Raumfahrt
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