Rotor-stator blade interference noise reduction system and flying object
AssigneeKabushiki Kaisha Toshiba
InventorsTatsuhiko GOTO, Akihiko ENAMITO
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Abstract
According to one embodiment, a rotor-stator blade interference noise reduction system includes a plurality of rotor blades rotating around a center axis, a plurality of stator blades facing the plurality of rotor blades and being equal in number to the plurality of rotor blades, a plurality of speakers installed approximately along a rotor blade plane defined by the plurality of rotor blades rotating and generating control sound, and an evaluation microphone, in which a distance from the evaluation microphone to one of the plurality of speakers, a distance from the evaluation microphone to another of the plurality of speakers, and a distance from the evaluation microphone to the center axis, are approximately equal.
Claims16
A rotor-stator blade interference noise reduction system, comprising:
- a plurality of rotor blades rotating around a center axis;
- a plurality of stator blades facing the plurality of rotor blades, and being equal in number to the plurality of rotor blades;
- a plurality of speakers installed approximately along a rotor blade plane defined by the plurality of rotor blades rotating, and generating control sound;
- and
- an evaluation microphone,
- wherein a distance from the evaluation microphone to one of the plurality of speakers, a distance from the evaluation microphone to another of the plurality of speakers, and a distance from the evaluation microphone to the center axis, are approximately equal.
A rotor-stator blade interference noise reduction system, comprising:
- a plurality of rotor blades rotating around a center axis;
- a plurality of stator blades facing the plurality of rotor blades, and being equal in number to the plurality of rotor blades;
- a plurality of speakers installed approximately along a rotor blade plane defined by the plurality of rotor blades rotating, and generating control sound;
- and
- an evaluation microphone,
- wherein
- a distance from a point where the center axis intersects with the rotor blade plane to the evaluation microphone is approximately equal to a distance from the evaluation microphone to one of the plurality of speakers, and is approximately equal to a distance from the evaluation microphone to another of the plurality of speakers.
A rotor-stator blade interference noise reduction system, comprising:
- a plurality of rotor blades rotating around a center axis;
- a plurality of stator blades facing the plurality of rotor blades, and being equal in number to the plurality of rotor blades;
- a plurality of speakers installed approximately along a rotor blade plane defined by the plurality of rotor blades rotating, and generating control sound;
- a tubular duct surrounding the plurality of rotor blades and the plurality of stator blades;
- an evaluation microphone attached to the duct and acquiring noise generated from the plurality of rotor blades and the control sound generated from the plurality of speakers;
- and
- a controller performing control using a virtual microphone system to virtually locate the evaluation microphone at a first virtual point approximately along the rotor blade plane or a second virtual point on the center axis,
- wherein if the first virtual point is adopted, the first virtual point is set so that a distance from the first virtual point to one of the plurality of speakers, a distance from the first virtual point to another of the plurality of speakers, and a distance from the first virtual point to the center axis, are equal, and
- if the second virtual point is adopted, the second virtual point is set so that a distance from a point where the center axis intersects with the rotor blade plane to the second virtual point is approximately equal to a distance from the second virtual point to one of the plurality of speakers, and is approximately equal to a distance from the second virtual point to another of the plurality of speakers,
- the controller causing the plurality of speakers to generate the control sound having a same phase and a same amplitude.
Dependencies are inferred from the claim text.