Airflow modifying element for suppressing airflow noise
US-2015064003-A1 · Mar 5, 2015 · US
Resonant blades using an aperture for cancellation of propeller generated noise
US9701394B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9701394-B2 |
| Application number | US-201514631403-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 25, 2015 |
| Priority date | Feb 25, 2015 |
| Publication date | Jul 11, 2017 |
| Grant date | Jul 11, 2017 |
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Abstract
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An exemplary apparatus minimizes an aircraft propeller noise having an associated frequency and a corresponding wavelength. A resonant tone produced on the propeller blade elicits a sound with substantially the same frequency as the associated frequency of the offending source. The resonant tone is powered by an inflow of air in or across an aperture of a resonant structure during the rotation of the blade and the aperture has an opening from which the sound is emitted. The resonant structure is dimensioned to generate a sound with substantially the same frequency as the offending source. The aperture is located on the blade with the opening a distance from a target origin of the noise that is substantially one half of the wavelength of the noise so that the sound arrives at the target origin of the noise substantially 180 degrees out of phase with the noise.
First claim
Opening claim text (preview).
The invention claimed is: 1. An apparatus for minimizing noise generated by blades of an aircraft propeller where the noise has a target origin and an associated frequency with a corresponding wavelength, the apparatus comprising: a mechanism disposed on the blade that produces a sound having a first frequency that is substantially the same frequency as the associated frequency of the noise; an aperture defining an opening that is part of the mechanism; a hollow vessel that is…
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Operations & Transport · mapped topic
Cross-Sectional Technologies · mapped topic
Operations & Transport · mapped topic
Operations & Transport · mapped topic
- B64C11/20Primary
Operations & Transport · mapped topic
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Frequently asked questions
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- What does patent US9701394B2 cover?
- An exemplary apparatus minimizes an aircraft propeller noise having an associated frequency and a corresponding wavelength. A resonant tone produced on the propeller blade elicits a sound with substantially the same frequency as the associated frequency of the offending source. The resonant tone is powered by an inflow of air in or across an aperture of a resonant structure during the rotation …
- Who is the assignee on this patent?
- Northrop Grumman Systems Corp
- What technology area does this patent fall under?
- Primary CPC classification B64C11/20. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Jul 11 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).