Acoustic reflector for a microphone configured to measure flyover noise generated by an aircraft
AssigneeAirbus Operations GmbH
InventorsPhilippe Bousquet, Vincent Blandeau
Life of this patent
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Abstract
An acoustic reflector for a microphone to measure flyover noise generated by an aircraft. The microphone is configured to measure flyover noise generated by an aircraft flying on a preset path. The acoustic reflector includes at least a central portion having the shape of an ellipse having a major axis and a plurality of peripheral portions distributed around the central portion. The acoustic reflector allows edge effects to be attenuated at the low frequencies of the noise to be measured.
Claims14
An acoustic reflector for a microphone, the microphone being configured to measure flyover noise generated by an aircraft flying on a preset path, the acoustic reflector comprising at least:
- a central portion comprising a housing configured to receive the microphone;
- and
- a plurality of peripheral portions comprising at least a first series of peripheral portions and a second series of peripheral portions, which are distributed around the central portion and are each joined to the central portion by a near end and extend to a far end;
- wherein the central portion has a shape of an ellipse, the ellipse having a center, a major axis and a minor axis;
- wherein each peripheral portion of the first series of peripheral portions has a first length, as measured from the far end thereof to the near end thereof;
- wherein each peripheral portion of the second series of peripheral portions has a second length, as measured from the far end thereof to the near end thereof;
- and
- wherein the first length is larger than the second length.
An acoustic reflector for a microphone, the microphone configured to measure flyover noise generated by an aircraft flying on a preset path, the acoustic reflector comprising at least:
- a central portion comprising a housing configured to receive the microphone;
- and
- a plurality of peripheral portions distributed around the central portion, each of the peripheral portions being joined to the central portion by a near end and extending to a far end;
- wherein the central portion has a shape of an ellipse, the ellipse having a center, a major axis and a minor axis;
- wherein each of the peripheral portions has two curved edges that are symmetric with respect to each other, each of the two curved edges having a first end and a second end, the two curved edges meeting at their respective first end, the second end being substantially coincident with a second end of a curved edge of an adjacent peripheral portion;
- and
- wherein each of the two curved edges is defined by a following polar equation of:
- R
- =
- R
- 1
- +
- 2
- π
-
- (
- R
- 2
- -
- R
- 1
- )
-
-
- cos
- -
- 1
-
- 1
- -
- 8
- π
-
- θ
- in which:
- R corresponds to a radius between the center of the ellipse and each of the two curved edges,
- R1 corresponds to a distance of the second end with respect to the center of the ellipse,
- R2 corresponds to a distance of the first end with respect to the center of the ellipse, and
- θ corresponds to a variable angle.
A method for measuring flyover noise generated by an aircraft flying on a preset path, comprising:
- providing an acoustic reflector for a microphone, the microphone being configured to measure flyover noise generated by an aircraft flying on a preset path, the acoustic reflector comprising at least:
- a central portion comprising a housing configured to receive the microphone;
- and
- a plurality of peripheral portions comprising at least a first series of peripheral portions and a second series of peripheral portions, which are distributed around the central portion and are joined to the central portion by a near end and extend to a far end,
- wherein the central portion has a shape of an ellipse, the ellipse having a center, a major axis and a minor axis;
- wherein each peripheral portion of the first series of peripheral portions has a first length, as measured from the far end thereof to the near end thereof;
- wherein each peripheral portion of the second series of peripheral portions has a second length, as measured from the far end thereof to the near end thereof;
- and
- wherein the first length is larder than the second length;
- positioning the acoustic reflector and a microphone accommodated in the housing of the central portion of the acoustic reflector on a piece of ground;
- and
- measuring noise generated by the aircraft when the aircraft flies over the acoustic reflector on the preset path.
Dependencies are inferred from the claim text.