公开(公告)号：US20150333721A1

公开(公告)日：2015-11-19

申请号：US14721751

申请日：2015-05-26

申请人： PRATT & WHITNEY CANADA CORP.

发明人： Poi Loon TANG ,  Teuvo SAARIO ,  Reza PEDRAMI

IPC分类号： H04B3/04 ,  H03H7/01

CPC分类号： H03H7/0153 ,  B64C27/001 ,  B64C2220/00 ,  G05B21/02

摘要： There is described herein a real-time scheme, implementable in software, hardware, or a combination thereof, to detect a resonating frequency of a structure from a sensed signal and dynamically set the center frequency of an adaptive compensator for effective attenuation of the resonating frequency.

摘要翻译： 这里描述了一种可在软件，硬件或其组合中实现的实时方案，以从感测信号中检测结构的谐振频率，并动态地设置自适应补偿器的中心频率以有效衰减谐振频率 。

公开(公告)号：US07407131B1

公开(公告)日：2008-08-05

申请号：US11288052

申请日：2005-11-14

申请人： Stephen Corda ,  Mark Stephen Smith ,  David Daniel Myre

发明人： Stephen Corda ,  Mark Stephen Smith ,  David Daniel Myre

IPC分类号： B64C1/40 ,  B64C23/00 ,  B64C15/00 ,  B64B1/00 ,  B64B1/36 ,  B64G1/26 ,  B64D1/00

CPC分类号： B64C23/005 ,  B64C2220/00 ,  B64C2230/16 ,  Y02T50/166

摘要： The present invention blocks and/or attenuates the upstream travel of acoustic disturbances or sound waves from a flight vehicle or components of a flight vehicle traveling at subsonic speed using a local injection of a high molecular weight gas. Additional benefit may also be obtained by lowering the temperature of the gas. Preferably, the invention has a means of distributing the high molecular weight gas from the nose, wing, component, or other structure of the flight vehicle into the upstream or surrounding air flow. Two techniques for distribution are direct gas injection and sublimation of the high molecular weight solid material from the vehicle surface. The high molecular weight and low temperature of the gas significantly decreases the local speed of sound such that a localized region of supersonic flow and possibly shock waves are formed, preventing the upstream travel of sound waves from the flight vehicle.

摘要翻译： 本发明使用高分子量气体的局部注入来阻止和/或衰减来自飞行车辆或以亚音速行驶的飞行车辆的部件的声学干扰或声波的上行行程。 还可以通过降低气体的温度来获得额外的益处。 优选地，本发明具有将高分子量气体从飞行器的鼻子，翼，部件或其他结构分配到上游或周围空气流中的手段。 用于分配的两种技术是从车辆表面直接喷射和升华高分子量固体材料。 气体的高分子量和低温显着地降低了本地的声速，从而形成了超音速流动和可能的冲击波的局部区域，从而防止来自飞行器的声波的上游行进。

公开(公告)号：US06915989B2

公开(公告)日：2005-07-12

申请号：US10136907

申请日：2002-05-01

申请人： Kioumars Najmabadi ,  Chuong B. Tran ,  John Koon-Hung Ho

发明人： Kioumars Najmabadi ,  Chuong B. Tran ,  John Koon-Hung Ho

IPC分类号： B64C13/16

CPC分类号： B64C13/16 ,  B64C2220/00

摘要： Vibrations due to excitation of the natural modes of an aircraft's body are suppressed by an active multi-axis modal suppression system. Dedicated sensors are positioned in the aircraft at optimal locations for sensing modal induced vibrations. The sensor produced signals are processed through control logic which, in response thereto, and in response to aircraft inertial, velocity and altitude related signals produces output control signals. The control signals effect control surface deployment creating forces to suppress the natural mode induced vibrations on multiple geometric axis's. More particularly, symmetric and anti-symmetric control surface deployments are used on one or more geometric axis's to damp lateral, longitudinal, vertical and most importantly torsional vibrational modes.

摘要翻译： 通过主动多轴模态抑制系统抑制由于飞机身体的自然模式的激发引起的振动。 专用传感器位于飞行器的最佳位置，用于感测模态诱发的振动。 传感器产生的信号通过控制逻辑进行处理，响应于此，响应于飞机惯性，速度和高度相关的信号产生输出控制信号。 控制信号影响控制表面部署，产生力以抑制多个几何轴上的自然模式引起的振动。 更具体地说，在一个或多个几何轴上使用对称和反对称的控制表面布置以阻止侧向，纵向，垂直和最重要的扭转振动模式。

公开(公告)号：US4845357A

公开(公告)日：1989-07-04

申请号：US154767

申请日：1988-02-11

申请人： Brian W. Brennan

发明人： Brian W. Brennan

IPC分类号： H02N2/00 ,  B64C3/48 ,  B64C27/00 ,  H01L41/04

CPC分类号： H01L41/042 ,  B64C27/001 ,  B64C3/48 ,  B64C2220/00

摘要： The method of the invention provides for actuating at least one actuator, such as a piezoelectric transducer in response to movement of a waveguide, such as an optical fiber. In a preferred embodiment of the invention, both the piezoelectric member and the optical fiber are connected to a structure. The connection is such that movement of the structure is detected by corresponding variations in and/or back scattering from light transmitted into the optical fiber. The piezoelectric member is actuated in response to the movement of the structural member as detected by the variations in the light in passing through the optical fiber. The actuation of the piezoelectric member may effect a dampening of the initial structural movement. Alternatively, monitoring the light passing through the fiber may be used as feed back on the position of the structural member, which in turn may be used to reposition the structural member by further actuation of a piezoelectric member.

公开(公告)号：US12000410B2

公开(公告)日：2024-06-04

申请号：US17826686

申请日：2022-05-27

申请人： Toyota Motor Engineering & Manufacturing North America, Inc.

发明人： Taehwa Lee ,  Tsuyoshi Nomura ,  Ercan Mehmet Dede

IPC分类号： F04D29/66 ,  B64C27/20 ,  B64C39/02 ,  B64U30/20

CPC分类号： F04D29/663 ,  B64C27/20 ,  B64C39/024 ,  B64C2220/00 ,  B64U30/20

摘要： A shroud for an air moving device includes a shroud body configured to at least partially surround one or more blades. The shroud body defines an annular cavity and an annular opening. The annular opening faces the one or more blades. The shroud also includes a Helmholtz resonator defined by the annular cavity and the annular opening. The Helmholtz resonator is configured to reflect sound generated by the one or more blades out of the shroud body.

公开(公告)号：US20240062660A1

公开(公告)日：2024-02-22

申请号：US18324610

申请日：2023-05-26

申请人： Joby Aero, Inc.

发明人： Ian Villa

IPC分类号： G08G5/00 ,  G06Q10/047 ,  B64C29/00 ,  G06Q10/0631 ,  G01C21/20 ,  G01C21/34 ,  G05D1/02

CPC分类号： G08G5/003 ,  G08G5/0013 ,  G06Q10/047 ,  B64C29/00 ,  G06Q10/06315 ,  G01C21/20 ,  G08G5/0034 ,  G08G5/0043 ,  B64C29/0016 ,  G01C21/3461 ,  G05D1/0202 ,  G08G5/0039 ,  B64C29/0025 ,  B64C29/0033 ,  B64C2220/00 ,  G05D1/102

摘要： Vertical take-off and landing (VTOL) aircraft can provide opportunities to incorporate aerial transportation into transportation networks for cities and metropolitan areas. However, VTOL aircraft may be noisy. To accommodate this, the aircraft may utilize onboard sensors, offboard sensing, network, and predictive temporal data for noise signature mitigation. By building a composite understanding of real data offboard the aircraft, the aircraft can make adjustments to the way it is flying and verify this against a predicted noise signature (via computational methods) to reduce environmental impact. This might be realized via a change in translative speed, propeller speed, or choices in propulsor usage (e.g., a quiet propulsor vs. a high thrust, noisier propulsor). These noise mitigation actions may also be decided at the network level rather than the vehicle level to balance concerns across a city and relieve computing constraints on the aircraft.

公开(公告)号：US20240034463A1

公开(公告)日：2024-02-01

申请号：US18257610

申请日：2022-01-25

申请人： NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS

发明人： Yongjie SHI ,  Taihang MA ,  Zhiyuan HU ,  Guohua XU ,  Yang LIU

IPC分类号： B64C27/00 ,  G10K11/178

CPC分类号： B64C27/001 ,  G10K11/17883 ,  G10K11/17875 ,  B64C2027/004 ,  B64C2220/00

摘要： A helicopter active noise suppression device integrating a sound array and on-propeller control, which relates to the technical field of helicopter noise reduction, includes an annular loudspeaker array, a plurality of force exciters, an error microphone, an Active Noise Cancellation (ANC) controller, a cockpit sensor, and an airborne computer. The annular loudspeaker array is arranged at a rotor hub and unsteady force exciters are arranged at each blade trailing edge to construct a sound field in an reversed phase to the sound wave of an original sound field with an ANC principle, thereby counteracting the noise and realizing the noise reduction of all-domain and all-type helicopter noise.

公开(公告)号：US11858619B2

公开(公告)日：2024-01-02

申请号：US17287744

申请日：2020-03-31

申请人： VINATI S.R.L.

发明人： Felice Vinati ,  Giacomo Vinati ,  Matteo Vinati ,  Mariachiara Vinati ,  Samuele Vinati

IPC分类号： B64C27/18 ,  B64C27/00 ,  B64D27/24 ,  B64D35/06

CPC分类号： B64C27/18 ,  B64C27/001 ,  B64D27/24 ,  B64D35/06 ,  B64C2220/00

摘要： An aircraft (100) with a rotary wing (40) is equipped with a propulsion system (10). The aircraft (100) includes a rotating mast (50) that rotates the rotor wing (40). The propulsion system (10) includes a pole (20) mechanically connected to the rotating mast (50) of the aircraft (100), where at least one end of the pole (20) is equipped with a motor (30) configured to rotate the pole (20) around the axis of the rotating mast (50) in such a way that the rotation of the pole (20) can be used to rotate the rotating wing (40). At each end of the pole (20) is placed a motor group (30), where each motor group (30) includes a pair of counter-rotating propellers (32,32), said pair of counter-rotating propellers (32,32′) being arranged in such a way as to generate a rotational torque to rotate the pole (20).

公开(公告)号：US10013900B2

公开(公告)日：2018-07-03

申请号：US14494032

申请日：2014-09-23

申请人： Amazon Technologies, Inc.

发明人： Brian C. Beckman

IPC分类号： G09F13/00 ,  G09F9/33 ,  G10K11/178

CPC分类号： G09F13/00 ,  B64C2201/027 ,  B64C2220/00 ,  G09F9/33 ,  G10K11/178 ,  G10K2210/123 ,  G10K2210/1281

摘要： This disclosure is directed to an automated aerial vehicle (“AAV”) and systems, devices, and techniques pertaining to canceling noise, generating audible communications, and/or generating visible communications. The AAV may include one or more propellers utilized, in part, to produce sound that cancels noise generated by one or more other propellers. Additionally or alternatively, the AAV may utilize one or more propellers to generate audible and/or visible communications.

公开(公告)号：US09959860B2

公开(公告)日：2018-05-01

申请号：US15725633

申请日：2017-10-05

申请人： Amazon Technologies, Inc.

发明人： Brian C. Beckman ,  Gur Kimchi

IPC分类号： G10K11/178 ,  B64C39/02 ,  G06N99/00 ,  G01S19/13

CPC分类号： G10K11/178 ,  B64C39/024 ,  B64C2201/024 ,  B64C2201/027 ,  B64C2201/108 ,  B64C2220/00 ,  G01S19/13 ,  G05D1/101 ,  G05D19/02 ,  G05D27/02 ,  G06N99/005 ,  G10K11/17823 ,  G10K11/17853 ,  G10K11/17873 ,  G10K2210/1281 ,  G10K2210/30231 ,  G10K2210/30351 ,  G10K2210/3038 ,  G10K2210/3045

摘要： Noises that are to be emitted by an aerial vehicle during operations may be predicted using one or more machine learning systems, algorithms or techniques. Anti-noises having equal or similar intensities and equal but out-of-phase frequencies may be identified and generated based on the predicted noises, thereby reducing or eliminating the net effect of the noises. The machine learning systems, algorithms or techniques used to predict such noises may be trained using emitted sound pressure levels observed during prior operations of aerial vehicles, as well as environmental conditions, operational characteristics of the aerial vehicles or locations of the aerial vehicles during such prior operations. Anti-noises may be identified and generated based on an overall sound profile of the aerial vehicle, or on individual sounds emitted by the aerial vehicle by discrete sources.