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    • 5. 发明申请
    • Piezoelectric Actuators Optimized for Synthetic Jet Actuators
    • 压电致动器优化用于合成喷气致动器
    • US20160333904A1
    • 2016-11-17
    • US14712510
    • 2015-05-14
    • The Boeing Company
    • Edward A. WhalenSteven F. GriffinMarthinus Cornelius van SchoorConor Clery
    • F15D1/00H01L41/22
    • F15D1/008F04B43/046H01L41/22
    • A synthetic jet actuator and a method for optimizing a synthetic jet actuator to meet operating requirements and physical constraints may include estimating dimension and a resonance frequency of an air cavity of the synthetic jet actuator, and using the estimated resonance frequency to the estimate dimensions of a piezoelectric actuator of the synthetic jet actuator. Individual simulations of the air cavity and piezoelectric actuator, and a coupled simulation may be performed using the estimated dimensions, and the dimensions may be revised and simulations re-executed to match the resonance frequencies of the air chamber and the piezoelectric actuator. The method maybe yield a synthetic jet actuator having a resonance frequency of the piezoelectric actuator that is approximately equal to a quarter-wavelength resonance frequency of the air cavity.
    • 合成射流致动器和用于优化合成射流致动器以满足操作要求和物理约束的方法可以包括估计合成射流致动器的空气腔的尺寸和共振频率,并将所估计的共振频率用于估计的 合成射流致动器的压电致动器。 空气腔和压电致动器的单独模拟以及耦合模拟可以使用估计的尺寸进行,并且可以修改尺寸并重新执行模拟以匹配气室和压电致动器的谐振频率。 该方法可以产生具有近似等于空气腔的四分之一波长共振频率的压电致动器的共振频率的合成射流致动器。
    • 7. 发明申请
    • REDUCING FRICTION OF A VISCOUS FLUID FLOW IN A CONDUIT
    • 减少流体中粘度流体的摩擦
    • US20140360587A1
    • 2014-12-11
    • US14368065
    • 2013-02-07
    • COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEACH ORGANISATION
    • Jie WuLachlan GrahamGregory Mark ShortDean William Harris
    • F17D1/17
    • F17D1/17F15D1/008F15D1/06F17D1/16Y10T137/0391Y10T137/2076Y10T137/2082
    • A device for reducing friction of a viscous fluid flow in a conduit includes a body (10,110) positionable to define at least a segment of a flow path for the viscous fluid in or contiguous with the conduit, a cavity (40,140) in the body for retaining lubricating fluid, and at least one port (42,142) in the body for delivering lubricating fluid to the cavity. A fluid outlet arrangement (48,148) from the cavity delivers lubricating fluid to the flow path to form a downstream lubricating film about viscous fluid flowing therein. The fluid outlet arrangement comprises a substantially continuous opening or ring of close spaced openings about the flow path. The cavity comprises an array of passages in the body that includes a plurality of elongate passages (55,155) that extend about the flow path effective collectively to reduce the pressure variation and therefore velocity variation of the delivered lubricating fluid along the outlet arrangement. A corresponding method is also disclosed.
    • 用于减少导管中的粘性流体流的摩擦的装置包括主体(10,110),其可定位成限定用于粘性流体或与导管邻接的粘性流体的流路的至少一段,所述主体中的空腔(40,140) 保持润滑流体,以及至少一个端口(42,142),用于将润滑流体输送到腔体。 来自空腔的流体出口装置(48,148)将润滑流体输送到流动路径,以在其中流动的粘性流体形成下游润滑膜。 流体出口装置包括围绕流动路径的基本上连续的开口或环的密闭间隔的开口。 空腔包括主体中的通道阵列,其包括多个细长通道(55,155),所述多个细长通道围绕流动路径延伸,共同有效地降低压力变化并因此减小输送的润滑流体沿出口装置的速度变化。 还公开了相应的方法。
    • 8. 发明授权
    • Method and apparatus for aerodynamic flow control using compact high-frequency fluidic actuator arrays
    • 使用紧凑型高频流体驱动器阵列进行气动流量控制的方法和装置
    • US08382043B1
    • 2013-02-26
    • US12804225
    • 2010-07-16
    • Surya Raghu
    • Surya Raghu
    • B64C21/04
    • B64C21/04B64C2230/04B64C2230/18F15D1/008Y02T50/166
    • The present invention is directed to the manufacture of and the use of an aerodynamic flow control device having a compact array of a plurality of fluidic actuators in planar, curved, circular and annular configurations. The compact array of fluidic actuators of the invention may be designed to produce oscillating or pulsed jets at the exit ports with frequencies in the range of 1-22 kHz. They may be integrally manufactured along with the wing sections, flaps, tail and rudder of airplane, the inlet or exit geometries of a jet engine. When supplied with a source of fluid such as air, these arrays of actuators produce a set of fluid jets of random phase of high velocity and influence the main stream of air over the subject surface. The beneficial effects of modifying flow using the present invention include increased lift, reduced drag, improved performance and noise reduction in jet engines.
    • 本发明涉及一种具有平面,弯曲,圆形和环形构造的多个流体致动器的紧凑阵列的空气动力学流量控制装置的制造和使用。 本发明的流体致动器的紧凑阵列可被设计成在出口处产生振荡或脉冲射流,频率范围为1-22kHz。 它们可以与飞机的翼部,翼片,尾翼和方向舵,喷气发动机的入口或出口几何形状一体制造。 当供应诸如空气的流体源时,这些致动器阵列产生一组高速度的随机相的流体射流并影响主体表面上的主要空气流。 使用本发明改进流动的有益效果包括增加升力,降低阻力,提高喷气发动机的性能和降噪。
    • 9. 发明申请
    • System and method for closed loop control of boundary layer shear stress
    • 边界层剪切应力闭环控制系统与方法
    • US20050199052A1
    • 2005-09-15
    • US11076274
    • 2005-03-09
    • Siva Mangalam
    • Siva Mangalam
    • G01M9/00
    • G01M9/06B64C23/005B64D43/02F15D1/0065F15D1/008Y02T50/166
    • A system is provided for controlling boundary layer shear stress adjacent a surface over which a fluid stream has been established. The system comprises a boundary layer control device adapted for altering at least one flow characteristic within a boundary layer in a selected region of the surface. The system further comprises a shear stress measurement system comprising a hot film sensor arrangement having at least one hot film sensor element appliable to the surface in the selected region. The at least one hot film sensor element is connected to an anemometer circuit configured to provide a sensor signal corresponding to heat transfer from the associated hot film sensor to the fluid stream. The system also comprises a control module in communication with the anemometer arrangement and the boundary layer control device. The control module is adapted for receiving and processing sensor signals signal from the anemometer circuit and for providing input signals to the boundary layer control device.
    • 提供了一种用于控制邻近流体流已经建立的表面的边界层剪切应力的系统。 该系统包括边界层控制装置,其适于在表面的选定区域中改变边界层内的至少一个流动特性。 该系统还包括剪切应力测量系统,该系统包括热膜传感器装置,其具有可应用于所选区域中的表面的至少一个热膜传感器元件。 所述至少一个热膜传感器元件连接到风速计电路,所述风速计电路被配置为提供对应于从相关联的热膜传感器到所述流体流的热传递的传感器信号。 该系统还包括与风速计布置和边界层控制装置通信的控制模块。 控制模块适用于从风速计电路接收和处理传感器信号信号,并向边界层控制装置提供输入信号。