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    • 75. 发明授权
    • Directed energy off-body heating for supersonic vehicle shockwave and sonic boom control
    • 用于超音速车辆冲击波和声波控制的定向能量离体加热
    • US07641153B2
    • 2010-01-05
    • US11284337
    • 2005-11-21
    • Philip Smereczniak
    • Philip Smereczniak
    • B64C23/00
    • B64C30/00B64C2220/00
    • Methods and apparatus for suppressing noise. The present invention provides a method that includes directing a laser at a first volume of gas and directing microwave radiation to a second volume. The method includes selecting the location of the second volume so that it is overrun by a shockwave system of a supersonic vehicle. Preferably, the directing of the radiation is from a vehicle that flies at high altitude and is of practical length (e.g., 100-400 feet or more). The radiation may be pulsed and steered. The present invention also provides a system including a laser and microwave antenna for controlling the noise of a supersonic vehicle. The laser is directed at a first volume while the antenna is pointed at a second volume that envelops the first volume. The location of the second volume is such that it will be overrun by the shockwave system of the vehicle.
    • 抑制噪音的方法和装置 本发明提供了一种方法,其包括将激光器引导到第一体积的气体并将微波辐射引导到第二体积。 该方法包括选择第二体积的位置,使其由超音速车辆的冲击波系统超速。 优选地,辐射的引导来自在高空飞行且具有实际长度(例如,100-400英尺或更大))的车辆。 辐射可以是脉冲和转向的。 本发明还提供了一种包括用于控制超音速车辆的噪声的激光和微波天线的系统。 当天线指向包围第一体积的第二体积时,激光被定向在第一体积上。 第二卷的位置使得它将被车辆的冲击波系统超载。
    • 78. 发明申请
    • Flow-driven oscillating acoustic attenuator
    • 流动振荡声衰减器
    • US20090045289A1
    • 2009-02-19
    • US12008134
    • 2008-01-09
    • Alan J. BilaninTodd J. QuackenbushPavel V. Danilov
    • Alan J. BilaninTodd J. QuackenbushPavel V. Danilov
    • B64C23/00
    • B64C23/005B64C2230/08B64C2230/24F15D1/10Y02T50/166
    • An apparatus for attenuating acoustic resonance generated by flow over a cavity in a surface comprises a plurality of flat flaps proximate to an upstream edge of the cavity. The flaps are disposed in an array spaced in a width direction of the cavity edge, and are oscillated by the flow in two degrees of freedom solely by the flow, independent of an actuation mechanism. Each flap includes a first hinge generally coextensive with the surface for enabling oscillation in a first degree of freedom and a second hinge orthogonal to the first hinge and forming a tab for enabling oscillation in a second degree of freedom. The hinges are constructed with torsional spring constants that provide predetermined oscillation frequencies and magnitudes. The apparatus can include a deployment mechanism for moving each flap between a stowed position wherein it is generally flush with the surface and a deployed position wherein the flap can be oscillated by the flow.
    • 用于衰减由表面上的腔体上的流动产生的声共振的装置包括靠近空腔的上游边缘的多个平板。 翼片被设置成在空腔边缘的宽度方向上间隔开的阵列中,并且仅通过流动而以两个自由度的流动振荡,而与致动机构无关。 每个翼片包括通常与表面共同延伸的第一铰链,用于使得能够在第一自由度中摆动,而第二铰链与第一铰链正交并形成用于使第二自由度摆动的翼片。 铰链由扭转弹簧常数构成,提供预定的振荡频率和幅度。 该装置可以包括一个展开机构,用于在收集位置之间移动每个折板,其中它与表面大致齐平,并且展开位置,其中翼片可以被流动摆动。