Audible fan noise cancellation
    4.
    发明授权
    Audible fan noise cancellation 有权
    声音风扇噪音消除

    公开(公告)号:US08218781B1

    公开(公告)日:2012-07-10

    申请号:US11821281

    申请日:2007-06-22

    IPC分类号: A61F11/06 G10K11/16 H03B29/00

    摘要: The present examples provide for the cancellation, or substantial reduction, of fan noise typically encountered in equipment cooling applications. Local audio nulls may be created by adjusting fan velocity and/or phase to cancel the fan noise near an operator. In a first example, phase and velocity of the fan may be controlled by feedback techniques. This technique utilizes feedback provided by a microphone located in the proximity of the operator to create an area of audio nulling of the fan noise. Local audio nulls may also be created by manipulating fan, phase and velocity by a controller that implements a process to create local audio nulls using the fixed position of equipment and the operator in the determination.

    摘要翻译: 本示例提供了在设备冷却应用中通常遇到的风扇噪声的消除或显着降低。 可以通过调整风扇速度和/或相位来消除操作员附近的风扇噪音来创建本地音频零点。 在第一个例子中,风扇的相位和速度可以通过反馈技术来控制。 该技术利用位于操作者附近的麦克风提供的反馈,以产生风扇噪声的音频零陷区域。 也可以通过控制器来操纵风扇,相位和速度来创建本地音频零点,所述控制器实现使用设备的固定位置和操作者在确定中创建本地音频零点的过程。

    Method and apparatus for synchronizing rotating machinery to reduce noise
    5.
    发明授权
    Method and apparatus for synchronizing rotating machinery to reduce noise 失效
    用于同步旋转机械以减少噪音的方法和装置

    公开(公告)号:US5221185A

    公开(公告)日:1993-06-22

    申请号:US740221

    申请日:1991-08-05

    摘要: A system for reducing noise created by multiple rotating machines by synchronizing the machines so as to establish a phase relationship between the machines which minimizes the noise. One or more feedback sensors, such as microphones, are placed so as to sense the noise to be reduced. The noise signals from the microphones are sent to a controller. Tachometer signals of the rotational speed of each machine are also sent to the controller. The controller generates an output signal in response to the inputs from the microphones and the tachometers that is fed to one or more of the rotating machines in order to establish the desired phase relationships.

    摘要翻译: 一种用于通过同步机器来减少由多台旋转机器产生的噪音的系统,以便建立最小化噪声的机器之间的相位关系。 放置一个或多个反馈传感器,例如麦克风,以便感测要降低的噪声。 来自麦克风的噪声信号被发送到控制器。 每台机器转速的转速信号也发送到控制器。 控制器响应于来自麦克风和被馈送到一个或多个旋转机器的转速计的输入而产生输出信号,以便建立期望的相位关系。

    VEHICLE NOISE CONTROL AND COMMUNICATION
    6.
    发明申请
    VEHICLE NOISE CONTROL AND COMMUNICATION 有权
    车辆噪声控制与通信

    公开(公告)号:US20160083073A1

    公开(公告)日:2016-03-24

    申请号:US14494032

    申请日:2014-09-23

    发明人: Brian C. Beckman

    IPC分类号: B64C1/40 G09F13/00 G09F9/33

    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.

    摘要翻译: 本公开涉及自动航空器(“AAV”)以及与消除噪声,产生可听通信和/或产生可视通信有关的系统,设备和技术。 AAV可以包括一个或多个螺旋桨,其部分地用于产生消除由一个或多个其它螺旋桨产生的噪声的声音。 另外或替代地,AAV可以利用一个或多个螺旋桨来产生可听和/或可见的通信。

    VARIABLE HUB-TO-HUB PHASING ROTOR SYSTEM
    7.
    发明申请
    VARIABLE HUB-TO-HUB PHASING ROTOR SYSTEM 有权
    可变的HUB-TO-HUB相位转子系统

    公开(公告)号:US20150217863A1

    公开(公告)日:2015-08-06

    申请号:US14174004

    申请日:2014-02-06

    IPC分类号: B64C27/00 F16F15/22

    摘要: An aircraft includes a first rotor assembly, a second rotor assembly, and a rotor phase angle control system. The system includes a phase adjustor operably associated with the first rotor assembly and the second rotor assembly. The method includes sensing vibrations exerted on the aircraft and offsetting a phase angle of the first rotor assembly and the second rotor assembly to minimize the vibrations.

    摘要翻译: 飞机包括第一转子组件,第二转子组件和转子相位角控制系统。 该系统包括可操作地与第一转子组件和第二转子组件相关联的相位调节器。 该方法包括感测施加在飞行器上的振动并抵消第一转子组件和第二转子组件的相位角以最小化振动。

    Method for reducing noise and/or vibration from multiple rotating
machines
    8.
    发明授权
    Method for reducing noise and/or vibration from multiple rotating machines 失效
    减少多台旋转机械噪音和/或振动的方法

    公开(公告)号:US5789678A

    公开(公告)日:1998-08-04

    申请号:US734825

    申请日:1996-10-22

    IPC分类号: B64C11/50 G10K11/178 G01N1/00

    摘要: A method for reducing the total operating noise and/or the total vibration of at least two generally-identical rotating machines. In one embodiment, the noise (or vibration) contribution of each machine at a predetermined reference relative phase angle is estimated. Optimum phase angles are calculated by minimizing a cost function which includes such estimated noise (or vibration) contributions and each rotating machine's relative phase angle. In another embodiment, the gradient of a weighted sum of a measure of the magnitude of the acoustic pressure amplitude of the total operating noise (or the amplitude of the total vibration) is measured. Each machine phase angle is adjusted by a predetermined increment opposite in sign to its associated gradient. The measuring and adjusting are repeated until the gradient is within a limit.

    摘要翻译: 一种用于减少至少两个大致相同的旋转机器的总操作噪声和/或总振动的方法。 在一个实施例中,估计每个机器在预定的参考相对角度下的噪声(或振动)贡献。 通过最小化包括这种估计噪声(或振动)贡献和每个旋转机器的相对相位角的成本函数来计算最佳相位角。 在另一个实施例中,测量总操作噪声(或总振动的振幅)的声压幅度的幅度的量度的加权和的梯度。 每个机器相位角度按照与其相关联的梯度相反的预定增量进行调整。 重复测量和调整直到梯度在极限内。

    Multiple source self noise cancellation
    10.
    发明授权
    Multiple source self noise cancellation 失效
    多源自噪声消除

    公开(公告)号:US5692054A

    公开(公告)日:1997-11-25

    申请号:US411785

    申请日:1995-06-30

    摘要: A repetitive noise cancellation system for multiple noise sources employing a controller (36) which senses radiated noise by reference sensors (35) and the status of the noise sources by position sensors (37, 38) and automatically controls one of the noise sources so that the noises being emitted from the multiple sources cancel one another.

    摘要翻译: PCT No.PCT / US92 / 08400 Sec。 371日期:1995年6月30日 102(e)日期1995年6月30日PCT提交1992年10月8日PCT公布。 公开号WO94 / 09483 日期1994年04月28日一种采用控制器(36)的多个噪声源的重复噪声消除系统,其通过参考传感器(35)感测辐射噪声,并通过位置传感器(37,38)检测噪声源的状态,并自动控制 噪声源,使得从多个源发射的噪声彼此抵消。