公开(公告)号：WO1993021064A1

公开(公告)日：1993-10-28

申请号：PCT/US1993003486

申请日：1993-04-14

Applicant: UNITED TECHNOLOGIES CORPORATION

Inventor： UNITED TECHNOLOGIES CORPORATION ,  YOERKIE, Charles, A. ,  WELSH, William, A. ,  SHEEHY, Thomas, W.

IPC: B64C27/00

CPC classification number: F16F15/00 ,  B64C27/001 ,  B64C2220/00 ,  Y10T74/2186

Abstract: An active noise control (ANC) system (10) for a helicopter that is operative to effectively nullify one or more high frequency vibrations emanating from the main transmission gearbox thereof at the gearbox/airframe interface, thereby significantly reducing the interior noise levels of the helicopter, that is design optimized to minimize the number of actuators required, and that is design optimized to minimize contamination forces arising from operation of the system actuators. The ANC system includes modified transmission beams (12) that are mechanically stiffened to function as rigid bodies with respect to the one or more of the high frequency vibrations, a plurality of actuators (20) disposed in combination with the modified transmission beams (12), a plurality of sensors (30) disposed in combination with the modified transmission beams (12) in a colinear, spaced apart functional correlation with respective actuators (20), and controllers (40) interconnecting individual actuators (20) with respective functionally correlated sensors (30). Each transmission beam (12) may be mechanically stiffened in its entirety or only at localized segments adjacent each mounting hardpoint (14) thereof. Each sensor (30) is operative to detect a single dimensional component of the one or more high frequency vibrations and to generate a signal representative thereof. Each controller (40) is operative in response to such signal to generate a command signal to control operation of the respective actuator (20). Each actuator (20) is operative in response to command signals to generate dimensional counterforces having a frequency, magnitude, and phase to effectively nullify the respective dimensional component of the one or more high frequency vibrations emanating from the transmission gearbox. Each actuator (20) is further operative in response to such command signals to generate cancelling forces to counteract contaminating forces arising from operation of the actuators (20).

Abstract translation: 一种用于直升机的主动噪声控制（ANC）系统，用于有效地消除在齿轮箱/机身接口处从其主变速箱发出的一个或多个高频振动，从而显着降低直升机的内部噪声水平，也就是说 优化的设计，以最小化所需的执行器的数量，并且这是优化的设计，以最小化由系统执行器的操作引起的污染力。 ANC系统包括机械加强以相对于高频振动中的一个或多个作为刚体的修改的传输梁，与修改的传输梁结合设置的多个致动器，多个传感器与 与各个致动器的共线，间隔的功能相关性的修改的透射束以及将各个致动器与相应的功能相关的传感器互连的控制器。

公开(公告)号：WO1993019926A1

公开(公告)日：1993-10-14

申请号：PCT/US1993002392

申请日：1993-03-17

Applicant: UNITED TECHNOLOGIES CORPORATION

Inventor： UNITED TECHNOLOGIES CORPORATION ,  JACARUSO, Gary, J. ,  DAVIS, Geoffrey, C. ,  MCINTIRE, Allen, J.

IPC: B29C65/34

CPC classification number: B29C65/3448 ,  B29C65/342 ,  B29C65/3444 ,  B29C65/3468 ,  B29C65/36 ,  B29C65/4815 ,  B29C65/5021 ,  B29C65/5057 ,  B29C66/112 ,  B29C66/1122 ,  B29C66/131 ,  B29C66/3034 ,  B29C66/43441 ,  B29C66/474 ,  B29C66/524 ,  B29C66/721 ,  B29C66/72525 ,  B29C66/73751 ,  B29C66/73771 ,  B29C66/73773 ,  B29C66/7392 ,  B29C66/73921 ,  B29C66/7394 ,  B29C66/73941 ,  B29C66/91221

Abstract: A heating element for providing localized heating during the thermoplastic bonding of thermoset composite structures is disclosed. Various construction details are developed which disclose an apparatus and method for uniformly heating a bond line. In one embodiment, a heating element (22) includes a resistance heating material (24) sandwiched between two layers of electrical insulation (25) and encased within a layer of thermoplastic material (26). Low resistance electrical leads (28), which extend across the width of the resistance heating material, and a power supply (30) provide electrical energy to raise the temperature of the resistance heating material.

Abstract translation: 公开了一种用于在热固性复合结构的热塑性粘合期间提供局部加热的加热元件。 开发了各种结构细节，其公开了用于均匀加热粘结线的装置和方法。 在一个实施例中，加热元件（22）包括夹在两层电绝缘层（25）之间并封装在一层热塑性材料（26）内的电阻加热材料（24）。 在电阻加热材料的宽度上延伸的低电阻电引线（28）和电源（30）提供电能以提高电阻加热材料的温度。

公开(公告)号：WO1993019920A1

公开(公告)日：1993-10-14

申请号：PCT/US1993002900

申请日：1993-03-26

Applicant: UNITED TECHNOLOGIES CORPORATION

Inventor： UNITED TECHNOLOGIES CORPORATION ,  HERTEL, Christopher, J. ,  WATSON, Charles, R. ,  LESHANE, Jeffrey, S.

IPC: B29C45/02

CPC classification number: B29C45/0005 ,  B29C45/0001 ,  B29C45/02 ,  B29C45/34

Abstract: A substantially microcrack- and blister-free composite can be made by drying an addition-type polyimide molding compound under suitable conditions to remove excess moisture. The molding compound includes a mixture of a polyimide resin and a plurality of carbon reinforcing fibers less than 3 mm long. The molding compound is placed into a heated material reservoir and transferred to a heated molding tool with a heated transfer ram. The ram establishes a molding pressure in a mold cavity in the molding tool sufficient to cure the molding compound into the desired composite. The molding compound is transferred to the mold cavity such that the molding compound is heated to a molding temperature at a rate of at least about 85 °C/min. The molding pressure and temperature are maintained in the mold cavity for a time sufficient to cure the molding compound into the desired composite. The composite is cooled and then heated to a suitable post-cure temperature at a rate sufficient to permit residual volatiles in the composite to diffuse out of the composite. The composite is held at the post-cure temperature for a sufficient time and then cooled. The invention also includes an article made by this method and a vented molding tool used in the method.

公开(公告)号：WO1993018320A1

公开(公告)日：1993-09-16

申请号：PCT/US1993001191

申请日：1993-02-10

Applicant: UNITED TECHNOLOGIES CORPORATION

Inventor： UNITED TECHNOLOGIES CORPORATION ,  HAYDUK, Matthew, T. ,  JACOBS, Eric, W.

IPC: F16H55/08

CPC classification number: F16H55/0806 ,  B64C27/12 ,  F16H55/088 ,  F16H55/0886 ,  F16H57/0006 ,  Y10T74/19963 ,  Y10T74/19972 ,  Y10T74/2186

Abstract: A transmission is provided wherein selected configurational parameters of interacting spur gearing are modified to abate the vibration levels thereof due to the effects of differential thermal expansion of the gearbox housing. The chordal addenda of the gear teeth of the interacting spur gearing are extended by a predetermined amount, based upon the computed relative radial displacement of the centerlines thereof due to the differential thermal expansion effects, to provide modified interacting spur gearing having increased outside diameters. Such modified spur gearing provides an effective centerline spacing for the transmission such that the interacting spur gearing thereof has an operating contact ratio greater than the design contact ratio at engine start up. As the transmission reaches stabilized operating conditions the operating contact ratio of the modified spur gearing is substantially equal to the design contact ratio due to the effects of differential thermal expansion on the transmission gearbox housing. In addition, the helix angle of the interacting spur gearing is substantially increased to counteract the effects of differential thermal expansion on the gearbox housing.

公开(公告)号：WO1993011448A1

公开(公告)日：1993-06-10

申请号：PCT/US1992009844

申请日：1992-11-19

Applicant: UNITED TECHNOLOGIES CORPORATION

Inventor： UNITED TECHNOLOGIES CORPORATION ,  MEINZER, Richard, A. ,  ZEPKE, Bruce, E.

IPC: G01S17/32

CPC classification number: G01S17/32 ,  G01S7/481

Abstract: A laser diode distance measurement device includes a laser diode (10) which emits light (20) to a lens (22) which provides focussed light (24) incident on a target (26). The light (24) is reflected from the target (26) back to the laser diode (10) which causes the laser diode (10) to emit a light (28) which exhibits intensity pulses (due to coherent interference) related to the distance (L) to the target (26). A photodetector (30) provides a feedback signal indicative of the intensity of the light (28) to a distance measurement circuit (18). The laser diode (10) is driven by an up-ramp signal that reduces electronic processing and at a frequency that reduces speckle noise. The distance measurement circuit (18) blanks out a portion of the feedback signal during discontinuities of the laser diode drive signal to minimize associated noise from distorting the distance measurement.

公开(公告)号：WO1993011447A1

公开(公告)日：1993-06-10

申请号：PCT/US1992009851

申请日：1992-11-19

Applicant: UNITED TECHNOLOGIES CORPORATION

Inventor： UNITED TECHNOLOGIES CORPORATION ,  LAPINTA, Leonard, T. ,  EPLER, J., David ,  GAMBARDELLA, John, F.

IPC: G01S13/72

CPC classification number: G01S13/723 ,  H01Q1/18

Abstract: A vehicle mounted radar tracking system (25) monitors vehicle heading rate (203), vehicle heading acceleration (215), vehicle roll rate (222) and vehicle pitch rate (231), and provides a turn detect signal (240) in response to heading rate, heading acceleration, roll rate or pitch rate being in excess of corresponding enable threshold magnitudes (218, 205, 225, 235). In response to the turn detect signal, the tracking system dead reckons (300) the positions of targets being tracked, and tracking system parameters (93, 105) are varied to make it more responsive to target motion. The turn detect signal is removed in response to heading rate, heading acceleration, roll rate and pitch rate being less than corresponding disable threshold magnitudes, and the tracking system is returned to normal operation.

公开(公告)号：WO1993010571A1

公开(公告)日：1993-05-27

申请号：PCT/US1992009939

申请日：1992-11-12

Applicant: UNITED TECHNOLOGIES CORPORATION

Inventor： UNITED TECHNOLOGIES CORPORATION ,  COLLIER, Donald, C. ,  KRUG, Kevin, J. ,  KUSTOM, Brittan

IPC: H01Q03/44

CPC classification number: H01Q3/44

Abstract: An arrangement of adjacent blocks (52-70) of ferroelectric material is disposed in the path (72) of electromagnetic radiation. A plurality of conductive electrodes (88-108) are provided, each pair of adjacent blocks having a corresponding electrode disposed therebetween. The electrodes are provided with voltage levels in a selected pattern. A bias electric field results across each block such that the electric field is in a direction both normal to the propagation and parallel to the polarization direction of the radiation. A change in the bias electric field can produce a change in the extraordinary wave propagation constant (i.e., the refractive index, ne) of the ferroelectric blocks. Such change produces a phase shift in the radiation which is varied across the face of the aperture, resulting in a controllable alteration of the emanating radiation direction.

Abstract translation: 铁电材料的相邻块（52-70）的布置设置在电磁辐射的路径（72）中。 提供多个导电电极（88-108），每对相邻的块之间设置有相应的电极。 电极以选定的图案提供电压电平。 每个块之间产生偏置电场，使得电场处于垂直于辐射并平行于辐射的偏振方向的方向。 偏置电场的变化可以产生铁电体块的异常波传播常数（即，折射率，ne）的变化。 这种变化产生在孔的表面上变化的辐射中的相移，导致发射辐射方向的可控变化。

公开(公告)号：WO1993007519A1

公开(公告)日：1993-04-15

申请号：PCT/US1992008541

申请日：1992-10-07

Applicant: UNITED TECHNOLOGIES CORPORATION

Inventor： UNITED TECHNOLOGIES CORPORATION ,  HOCKADAY, Bruce, D.

IPC: G02B06/12

CPC classification number: G02B7/008 ,  G02B6/30

Abstract: A package for an IOC fabricated from an anisotropic material, such as X-cut lithium niobate or lithium tantalate, having identical thermal expansion coefficients in the X and Y directions and a different thermal expansion in the Z direction, or for an IOC fabricated from an isotropic material, such as gallium arsenide or silicon, includes an IOC enclosure having a planar mounting surface which has identical thermal expansion coefficients in the X and Y directions. The coefficients of the planar mounting surface are relatively similar to the thermal expansion coefficients of a planar surface of the IOC. A planar surface of the IOC is attached to the planar mounting surface of the package.

公开(公告)号：WO1993005463A1

公开(公告)日：1993-03-18

申请号：PCT/US1992007236

申请日：1992-08-26

Applicant: UNITED TECHNOLOGIES CORPORATION

Inventor： UNITED TECHNOLOGIES CORPORATION ,  WRIGHT, Stuart, C. ,  DRYFOOS, James, B.

IPC: G05D01/08

CPC classification number: B64C13/503 ,  G05D1/0825 ,  G05D1/0858

Abstract: An aircraft flight control system including model following control laws includes improved logic and algorithms to limit the error between a desired parameter value from the output of a model and an actual parameter value. Such logic is operable to sense the amount of said parameter error and to limit the amount of the error if it exceeds a predetermined value. The difference between the predetermined limit and the actual error is fed back to the model such that the output of the model is adjusted so that the error between the desired and actual parameter values does not exceed the predetermined value.

公开(公告)号：WO1993005460A1

公开(公告)日：1993-03-18

申请号：PCT/US1992006436

申请日：1992-07-31

Applicant: UNITED TECHNOLOGIES CORPORATION

Inventor： UNITED TECHNOLOGIES CORPORATION ,  GOLD, Phillip, J. ,  FAULL, Walter, R.

IPC: G05D01/08

CPC classification number: G05D1/085 ,  G05D1/0858

Abstract: A helicopter flight control system (21) includes a model following control system architecture which automatically provides a coordinating yaw command signal to the helicopter tail rotor to coordinate helicopter flight during a low speed banked turn. The control system processes information from a variety of helicopter sensors (31) in order to provide the coordinating yaw command signal on an output line (72) to the tail rotor (20) of the helicopter.