Helicopter blade vortex interaction noise reducing method and device
AssigneesKawada Industries, Inc., Japan Aerospace Exploration Agency
InventorsYasutada Tanabe, Takeshi Akasaka, Shigeru Saito, Noboru Kobiki
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Abstract
The present method is characterized by providing the rotor blade with a tab 3, which can advance and retreat with respect to rear of rotating direction of the rotor blade between a position where the tab protrudes from a trailing edge of the rotor blade and a position where the tab does not, and providing an actuator 4, which advances and retreats the tab 3, and operating the actuator 4 so that the tab advances and retreats in response to rotating timing of the rotor blade 2, when reducing the BVI noise of the rotor blade of a helicopter. Thus, the BVI noise of a helicopter can be reduced effectively.
Claims15
A BVI noise reduction method for a helicopter providing:
- a tab which can advance and retreat with respect to rear of rotating direction of a rotor blade between a position where said tab protrudes from a trailing edge of said rotor blade and a position where said tab does not;
- an actuator to advance and retreat said tab in a rotor system including said rotor blade rotating with respect to a body of the helicopter;
- wherein said actuator is operated to advance and retreat said tab in response to rotating timing of said rotor blade, when reducing the BVI noise of said rotor blade of a helicopter.
A BVI noise reduction apparatus for a helicopter to reduce the BVI noise of a rotor blade (2) of a helicopter comprising:
- a tab (3) which is provided in said rotor blade and can advance and retreat with respect to rear of rotating direction of said rotor blade between a position where said tab protrudes from a trailing edge of said rotor blade and a position where said tab does not;
- an actuator (4) which is provided in a rotor system (1) which includes said rotor blade and rotates with respect to a body of the helicopter and which advances and retreats said tab;
- and
- a control device (S) which is provided in said rotor system and operates said actuator so that said tab advances and retreats in response to rotating timing of said rotor blade.
Dependencies are inferred from the claim text.