公开(公告)号：WO2016137745A1

公开(公告)日：2016-09-01

申请号：PCT/US2016/017249

申请日：2016-02-10

Applicant: NORTHROP GRUMMAN SYSTEMS CORPORATION

Inventor： LINCH, Jonathon J.

IPC: B64C11/00 ,  B64C11/18 ,  B64C21/02

CPC classification number: B64C11/20 ,  B64C11/00 ,  B64C11/18 ,  B64C21/02 ,  B64C2220/00 ,  B64C2230/14 ,  B64C2230/24 ,  Y02T50/166

Abstract: 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.

Abstract translation: 一种示例性装置使具有相关频率和相应波长的飞机螺旋桨噪声最小化。 在螺旋桨叶片上产生的共振音响引起具有与有害源的相关频率基本相同的频率的声音。 谐振音由在叶片旋转期间在谐振结构的孔内或横过谐振结构的孔的流入来驱动，并且孔具有从中发出声音的开口。 谐振结构的尺寸被设计成产生具有与有害源基本相同的频率的声音。 光圈位于叶片上，其开口距离噪声的目标原点的距离大致为噪声波长的一半，使得声音到达噪声的目标原点大致180度异相，与 噪声。

公开(公告)号：WO2016089569A1

公开(公告)日：2016-06-09

申请号：PCT/US2015/060197

申请日：2015-11-11

Applicant: NORTHROP GRUMMAN SYSTEMS CORPORATION

Inventor： LINCH, Jonathon J. ,  RAHRIG, Kyle M.

IPC: B64C11/00

CPC classification number: B64C11/001 ,  B64C11/08 ,  B64C11/18 ,  B64C39/024 ,  B64C39/10 ,  B64C2039/105 ,  B64C2201/028 ,  B64C2201/162 ,  B64C2220/00 ,  Y02T50/12

Abstract: A propeller includes a hub coaxially surrounding a longitudinal axis. A ring shroud coaxially surrounds the longitudinal axis and is spaced radially from the hub. At least one propeller blade is fixedly attached to both the hub and ring shroud and extends radially therebetween for mutual rotation therewith. At least one stub blade has a first stub end radially spaced from a second stub end. The first stub end is fixedly attached to a selected one of the hub and ring shroud. The second stub end is cantilevered from the first stub end and is radially interposed between the first stub end and the selected one of the hub and ring shroud.

Abstract translation: 螺旋桨包括同轴地围绕纵向轴线的轮毂。 环形护罩同轴地围绕纵向轴线并与轮毂径向间隔开。 至少一个螺旋桨叶片固定地附接到轮毂和环形护罩上并且在其间径向延伸以与其相互旋转。 至少一个短刀片具有与第二短截线径向间隔开的第一短截线端。 第一短截线端部固定地连接到轮毂和环形护罩中的所选择的一个。 第二短截线端部从第一短截线端部悬臂，并且径向插入在第一短截线端与轮毂和环形护罩中选定的一个之间。

公开(公告)号：EP3328729A2

公开(公告)日：2018-06-06

申请号：EP16829009.6

申请日：2016-07-06

Applicant: Northrop Grumman Systems Corporation

Inventor： LINCH, Jonathon J. ,  RAHRIG, Kyle M.

IPC: B64C11/00 ,  B64C39/02

CPC classification number: B64C11/001 ,  B64C39/024 ,  B64C39/10 ,  B64C2039/105 ,  B64C2201/028 ,  B64C2201/104 ,  B64C2201/165

Abstract: A propeller includes a hub coaxially surrounding a longitudinal axis. A ring shroud coaxially surrounds the longitudinal axis and is spaced radially from the hub. The ring shroud includes an inner ring surface and a radially spaced, oppositely facing outer ring surface. At least one propeller blade is fixedly attached to both the hub and the inner ring surface and extends radially therebetween for mutual rotation therewith. At least one extending blade has a first extending blade end radially spaced from a second extending blade end. The first extending blade end is fixedly attached to the outer ring surface. The second extending blade end is cantilevered from the first extending blade end and is radially spaced from the ring shroud.

公开(公告)号：EP3227180A1

公开(公告)日：2017-10-11

申请号：EP16709172.7

申请日：2016-02-10

Applicant: Northrop Grumman Systems Corporation

Inventor： LINCH, Jonathon J.

IPC: B64C11/00 ,  B64C11/18 ,  B64C21/02

CPC classification number: B64C11/20 ,  B64C11/00 ,  B64C11/18 ,  B64C21/02 ,  B64C2220/00 ,  B64C2230/14 ,  B64C2230/24 ,  Y02T50/166

Abstract: 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.

Abstract translation: 示例性装置使具有相关频率和相应波长的飞机螺旋桨噪声最小化。 螺旋桨叶片上产生的共鸣音产生的噪音频率与有害源的频率基本相同。 共振音由叶片旋转期间共振结构的孔中或跨过共振结构的孔的空气流入来驱动，并且孔具有用于发出声音的开口。 谐振结构的尺寸被设计为产生具有与有害源大致相同频率的声音。 孔位于叶片上，其开口与噪声的目标原点的距离基本上是噪声波长的一半，以便声音到达噪声的目标原点，与噪声的相位基本上相差180度 噪声。

公开(公告)号：EP3227180B1

公开(公告)日：2019-06-19

申请号：EP16709172.7

申请日：2016-02-10

Applicant: Northrop Grumman Systems Corporation

Inventor： LINCH, Jonathon J.

IPC: B64C11/00 ,  B64C11/18 ,  B64C21/02