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492 条记录 (耗时 0.022 秒)

    Diffusor without any pulsation of the shock boundary layer, and a method for suppressing the shock boundary layer pulsation in diffusors
    81.
    发明申请
    Diffusor without any pulsation of the shock boundary layer, and a method for suppressing the shock boundary layer pulsation in diffusors 失效
    没有冲击边界层的任何脉动的扩散器，以及用于抑制扩散器中的冲击边界层脉动的方法

    公开(公告)号：US20020018714A1

    公开(公告)日：2002-02-14

    申请号：US09930404

    申请日：2001-08-15

    发明人： Peter Kraus

    IPC分类号： F03B011/00

    CPC分类号： F01D25/30 ,  F01D25/04 ,  F05D2250/191 ,  Y10S415/914

    摘要： A diffuser for slowing down a fluid and a method for operating a diffuser is described. A channel of the diffusor has an inlet with a smaller flow cross section than a flow cross section of an outlet and at least one opening for receiving an energizing fluid to be transported selectively into the channel. Pulsations of the impact interface are suppressed effectively at all of the operating points by injecting the energization fluid. Pressures of the fluid moving in the diffusor are measured, and amplitudes and frequencies of the measured pressures are evaluated. Energizing fluid is fed into the diffusor if the amplitudes within a predetermined frequency band exceed a threshold value. The utilization ratio of the inventive diffuser is considerably improved as a result of such a measure.

    摘要翻译： 描述了用于减慢流体的扩散器和用于操作扩散器的方法。 扩散器的通道具有比出口的流动横截面更小的流动横截面的入口和用于接收有选择地输送到通道中的通电流体的至少一个开口。 冲击界面的脉冲通过注入通电流体在所有操作点被有效地抑制。 测量在扩散器中移动的流体的压力，并且评估所测量的压力的幅度和频率。 如果预定频带内的振幅超过阈值，则激励流体被馈送到扩散器中。 作为这种措施的结果，本发明的扩散器的利用率得到了显着改善。

    Vibration damper for rotor housings
    83.
    发明授权
    Vibration damper for rotor housings 失效
    转子外壳的减振器

    公开(公告)号：US5429477A

    公开(公告)日：1995-07-04

    申请号：US295265

    申请日：1994-08-24

    申请人： Siegfried Sikorski ,  Reinhold Schoenacher ,  Michael Schober ,  Wolfgang Diepolder

    发明人： Siegfried Sikorski ,  Reinhold Schoenacher ,  Michael Schober ,  Wolfgang Diepolder

    IPC分类号： F01D21/04 ,  F01D25/04 ,  F04D29/66

    CPC分类号： F01D25/04 ,  F01D21/045 ,  Y02T50/672

    摘要： A vibration damper for rotor housings includes a rubber-elastic damping band (6) that encircles the outer circumference of the rotor housing (4) in a contour fitting manner. A clamping band (7) encircles the damping band (6) and secures the damping band to the housing (4). The clamping band is made of a material having a different modulus of elasticity than the material of the rotor housing, which achieves a detuning of the vibrational system including the rotor housing and the vibration damper as components. Such a detuning reduces the vibrational tendency of the rotor housing. Frictional rubbing between the damping band and the housing surface, and between the damping band and the clamping band effectively damps or dissipates the energy of any vibration that does occur. The clamping band includes a tension adjustment element that is adjustable and releasable so that the clamping band and the entire vibration damper may easily be removed from the housing for carrying out maintenance and inspection procedures.

    摘要翻译： 用于转子壳体的减震器包括以轮廓拟合方式围绕转子壳体（4）的外圆周的橡胶弹性阻尼带（6）。 夹紧带（7）围绕阻尼带（6）并将阻尼带固定到壳体（4）上。 夹紧带由具有与转子壳体的材料不同的弹性模量的材料制成，其实现包括转子壳体和振动阻尼器作为部件的振动系统的失谐。 这种失谐降低了转子壳体的振动趋势。 在阻尼带和壳体表面之间以及阻尼带和夹紧带之间的摩擦摩擦可有效地抑制或消散确实发生的任何振动的能量。 夹紧带包括可调节和可释放的张力调节元件，使得夹紧带和整个减震器可以容易地从壳体移除以进行维护和检查程序。

    Active control of aircraft engine noise using vibrational inputs
    84.
    发明授权
    Active control of aircraft engine noise using vibrational inputs 失效
    使用振动输入主动控制飞机发动机噪声

    公开(公告)号：US5370340A

    公开(公告)日：1994-12-06

    申请号：US51810

    申请日：1993-04-21

    申请人： Frederic G. Pla

    发明人： Frederic G. Pla

    IPC分类号： F01D25/04 ,  G10K11/178 ,  G10K11/16 ,  F01D5/26

    CPC分类号： G10K11/1788 ,  F01D25/04 ,  F05D2260/962 ,  G10K2210/107 ,  G10K2210/121 ,  G10K2210/1281 ,  G10K2210/3212 ,  G10K2210/32291 ,  Y02T50/671

    摘要： An active noise control system which minimizes noise output by creating a secondary, cancelling noise field using vibrational inputs. The system includes one or more piezoceramic actuators mounted to the inner surface of the shroud of an aircraft engine. The actuators can be either mounted directly to the shroud or to one or more noise cancelling members which are resiliently mounted the shroud. Transducers are also provided for sensing the noise generated by the engine and producing an error signal corresponding to the level of noise sensed. A controller sends a control signal to the actuators in response to the error signal, thereby causing the actuators to vibrate and generate a noise field which minimizes the total noise emanating from the engine. The piezoceramic actuators can be thin sheets of piezoceramic material or can be in the form of a piezoelectric-driven mechanical lever arrangement.

    摘要翻译： 一种主动噪声控制系统，通过使用振动输入产生次级的消除噪声场，使噪声输出最小化。 该系统包括一个或多个安装在飞行器发动机罩的内表面上的压电陶瓷致动器。 致动器可以直接安装在护罩上，也可以安装在弹性地安装护罩的一个或多个噪音消除构件上。 还提供了用于感测由发动机产生的噪声并且产生与所感测的噪声水平相对应的误差信号的传感器。 控制器响应于误差信号向致动器发送控制信号，从而使致动器振动并产生使从发动机发出的总噪声最小化的噪声场。 压电陶瓷致动器可以是薄的压电陶瓷材料，或者可以是压电驱动的机械杆装置的形式。

    Gas turbine engine motor assembly
    85.
    发明授权
    Gas turbine engine motor assembly 失效
    燃气轮机发动机电机总成

    公开(公告)号：US4973221A

    公开(公告)日：1990-11-27

    申请号：US338704

    申请日：1989-04-17

    申请人： Bernard J. Anderson ,  Melvin Bobo

    发明人： Bernard J. Anderson ,  Melvin Bobo

    IPC分类号： F01D5/06 ,  F01D5/10 ,  F01D25/04 ,  F02C3/06 ,  F02C7/275 ,  F02C7/32 ,  F16C27/04

    CPC分类号： F16C27/04 ,  F01D25/04 ,  Y10T464/50

    摘要： A gas turbine engine rotor assembly has an inertial damper loosely surrounding a portion of the main rotor shaft. The damper is axially compressed between facing abutment surfaces provided on a nut and bevel gear. The damper has two axially spaced rows of circumferentially spaced slots, with the interrupting web portions of each row being circumferentially staggered with respect to one another. The damper is configured and dimensioned so that the axial force exerted by the damper on the nut and bevel gear, the polar moment of inertia of the damper, and the coefficient of friction between the damper end faces and the abutment surfaces, cooperate to effectively damp the excitation of the fifth-stage blades in response to application of a source of vibrations at a particular frequency to the bevel gear.

    摘要翻译： 燃气涡轮发动机转子组件具有松散地围绕主转子轴的一部分的惯性阻尼器。 阻尼器在设置在螺母和锥齿轮上的相对的邻接表面之间被轴向压缩。 阻尼器具有两个轴向间隔开的一排周向间隔开的槽，每排的中断腹板部分相对于彼此周向交错。 阻尼器的构造和尺寸使得阻尼器在螺母和锥齿轮上施加的轴向力，阻尼器的极性惯性力矩以及阻尼器端面和邻接表面之间的摩擦系数配合，以有效地阻尼 响应于将特定频率的振动源施加到锥齿轮，第五级叶片的激励。

    Method and apparatus for selective cancellation of subsynchronous resonance
    86.
    发明授权
    Method and apparatus for selective cancellation of subsynchronous resonance 失效
    用于选择性消除次同步谐振的方法和装置

    公开(公告)号：US4513240A

    公开(公告)日：1985-04-23

    申请号：US502374

    申请日：1983-06-08

    申请人： Thomas H. Putman

    发明人： Thomas H. Putman

    IPC分类号： H01F30/12 ,  F01D25/04 ,  H02J3/18 ,  H02J3/24 ,  H02M5/12 ,  G05F1/70

    CPC分类号： F01D25/04 ,  H02J3/1878 ,  H02J3/24 ,  H02M5/12 ,  Y02E40/12 ,  Y02E40/30

    摘要： Apparatus and process for the selective cancellation of harmonic frequencies of current produced in a multiphase dynamic stabilizer. A plurality of multiphase dynamic stabilizers providing electrical stabilization are interconnected to a multiphase AC electrical network via a coupling transformer. The leakage reactances and turns ratios of the windings of the transformer are such that the phases of selected harmonic frequencies of current produced in each of the stabilizer means are rotated with respect to those of the other stabilizer means with the selected harmonic frequencies being substantially cancelled in each of the stabilizer means. The harmonics are not the cause of subsynchronous resonance. The cancelled harmonic frequencies are dependent upon the number of dynamic stabilizers used. Where a dual stabilizer system is utilized, the coupling transformer is forked wye transformer having the primary windings connected in delta with the principal secondary windings connected in wye and each principal secondary winding having two auxiliary secondary windings connected thereto. By forming the auxiliary secondary windings such that the ratio of the number of turns therein with respect to the principal secondary winding is about the ##EQU1## and the leakage reactance of the principal secondary winding being equal to about twice the common leakage reactance of the auxiliary secondary windings, the phases of the harmonic currents produced in each stabilizer rotates by approximately 30 electrical degrees with respect to one another leading to the substantial cancellation of harmonic currents of each stabilizer characterized by the series 5, 7, 17, 19 . . . n, p where n=5+z; p=7+z; and z=multiples of 12. Addition of shunt capacitors across each of the primary windings creates a static VAR generator having the same harmonic current cancellation attribute.

    摘要翻译： 用于选择性消除在多相动态稳定器中产生的电流的谐波频率的装置和过程。 提供电稳定性的多个多相动态稳定器通过耦合变压器互连到多相交流电网络。 变压器的绕组的漏电抗和匝数比使得在每个稳定装置中产生的电流的选定谐波频率相对于其他稳定装置的相位相对于所选择的谐波频率基本上被消除 每个稳定装置。 谐波不是次同步谐振的原因。 取消的谐波频率取决于使用的动态稳定器的数量。 在使用双稳定器系统的情况下，耦合变压器是分叉式母线变压器，其初级绕组以三角形连接，主次级绕组连接在叶片中，每个主次级绕组具有连接到其上的两个辅助次级绕组。 通过形成辅助次级绕组，使得其中相对于主次级绕组的匝数比约为“IMAGE”，主次级绕组的漏电抗等于辅助次级绕组的常见漏电抗的两倍 次级绕组中，在每个稳定器中产生的谐波电流的相位相对于彼此旋转大约30电角，导致基本上消除了以系列5,7,17​​,19为特征的每个稳定器的谐波电流。 。 。 n，p，其中n = 5 + z; p = 7 + z; 并且z = 12.的倍数。在每个初级绕组上添加并联电容器产生具有相同谐波电流消除属性的静态VAR发生器。

    Stator vane with variable center of gravity
    89.
    发明授权
    Stator vane with variable center of gravity 有权

    公开(公告)号：US12044135B1

    公开(公告)日：2024-07-23

    申请号：US18502161

    申请日：2023-11-06

    申请人： PRATT & WHITNEY CANADA CORP.

    发明人： Marco Convertini ,  Piotr Szczesnowicz ,  Ernest Adique

    IPC分类号： F01D25/04 ,  F01D9/04

    CPC分类号： F01D25/04 ,  F01D9/04 ,  F05D2220/323 ,  F05D2240/12 ,  F05D2260/96

    摘要： A stator assembly for an aircraft engine, has: vanes distributed about a central axis, a vane having: an airfoil extending from a first end to a second end along a span and from a leading edge to a trailing edge along a chord, the airfoil having a pressure side and a suction side opposed to the pressure side; a slot within the airfoil, the slot extending in a direction having a component along the chord, the slot located between the pressure side and the suction side; a port at the leading edge, the port fluidly communicating with the slot and with the gaspath; a mass located within the slot, the mass movable within the slot to shift a center of gravity of the vane in a chordwise direction; and a biasing member biasing the mass in a direction opposite a pressure force generated by the flow of fluid.