Active noise control system for a helicopter gearbox mount

B - Operations – Transporting – 64 – C

Patent

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Details

B64C 27/00 (2006.01) F16F 7/10 (2006.01) F16F 15/00 (2006.01) F16F 15/02 (2006.01) G10K 11/178 (2006.01)

Patent

CA 2316243

An active noise control system (12) for a helicopter (10) for minimizing undesirable acoustic noise in a cabin (14, 15), wherein said noise is generated by high frequency structural vibrations emanating from a gearbox (16), and wherein the gearbox has a plurality of attachment feet (18) structurally coupling the gearbox to a cabin structure. The active noise control system comprises a sensor subsystem (26) disposed in combination with the cabin for sensing the said noise in the cabin, or in combination with the gearbox, an actuator subsystem (28) disposed in combination with at least one of said attachment feet, and a controller (30) functionally interconnecting the sensor subsystem to the actuator subsystem, the controller being operative to receive input from the sensor subsystem and to transmit command signals to the actuator subsystem in response thereto for generating at least one high frequency counter-vibration that is interactive with the high frequency vibrations to minimize said noise in the cabin.

Système (12) de lutte active contre le bruit destiné à un hélicoptère (10), qui permet de minimiser le bruit acoustique indésirable dans une cabine (14, 15) dans laquelle ledit bruit est produit par les vibrations structurelles haute fréquence émanant de la boîte de vitesses (16). Celle-ci comporte une pluralité de pieds de fixation (18), qui la couplent structurellement à une structure cabine. Le système de lutte active contre le bruit comprend un sous-système capteur (26) associé à la cabine, qui détecte le bruit acoustique indésirable dans la cabine, ou associé à la boîte de vitesses; un sous-système actionneur (28), associé à au moins un desdits pieds de fixation; et un dispositif de commande (30), qui relie fonctionnellement le sous-système capteur au sous-système actionneur. Le dispositif de commande reçoit les entrées provenant du sous-système capteur et transmet des signaux de commande au sous-système actionneur en réponse auxdites entrées, de façon à générer au moins une contre-vibration haute fréquence qui interagit avec les vibrations haute fréquence et minimise ainsi ledit bruit dans la cabine.

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