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| Number | Title | Issue Date |
| 7397211 | Motor control apparatus A motor control apparatus includes a first FG pattern for generating a first induced voltage attendant upon rotation of the rotor of a motor; a second FG pattern for generating a second induced voltage due to noise; a differential amplifier for differentially amplif... | 07/08/2008 |
| 7348741 | Method and device for controlling fan for cooling vehicle-mounted battery A vehicle which uses an internal combustion engine and a motor generator as drive sources is provided with a battery disposed under a seat and a fan for cooling the battery. Power is exchanged between the motor generator and battery via an inverter. An electronic co... | 03/25/2008 |
| 7303377 | Apparatus and method of balancing a shaft An apparatus for balancing a shaft of an aircraft engine preferably includes a plate and the use of standard fasteners. The plate provides mounting for a nose cone, and the balancing apparatus may be accessed from the front of the assembled engine. ... | 12/04/2007 |
| 7100868 | Method for the control of aero gas turbine engines The exchange, removal or addition, as applicable, of media and/or power between the individual shafts of an engine, between individual engines and between the engines and the aircraft provides for additional degrees of freedom, enabling engine parameters to be addre... | 09/05/2006 |
| 6956339 | Multiple hoist synchronization apparatus and method A hoist synchronization apparatus and method using a master controller operating software that provides a pulse reference to a slave controller. The slave commands its motor to rotate at the speed conveyed by that pulse reference. The slave controller monitors the p... | 10/18/2005 |
| 6905091 | System and method for controlling the acoustic signature of a device A system receives information regarding current flight conditions of a device such as an aircraft and determines the acoustic level of the sonic boom and/or other noise generated by the device during operation. The current acoustic level is compared to a desired lev... | 06/14/2005 |
| 6712314 | Method for the control of aero gas turbine engines The exchange, removal or addition, as applicable, of media and/or power is provided between the individual shafts of an engine, between individual engines and between the engines and the aircraft. Thus, additional degrees of freedom are provided, enabling engine par... | 03/30/2004 |
| 5789678 | Method for reducing noise and/or vibration from multiple rotating machines 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... | 08/04/1998 |
| 5715162 | Correlative filter for a synchrophaser A synchrophaser for a multi-engine, propeller-driven aircraft including a filter that automatically compensates for misalignment of blade position sensor tabs through derivation and application of a correlation coefficient. The correlation coefficient is ... | 02/03/1998 |
| 5453943 | Adaptive synchrophaser for reducing aircraft cabin noise and vibration An "adaptive synchrophaser" is disclosed for modifying the phase angle relationship between aircraft propellers to reduce cabin noise and/or vibration. Rather than use a constant pre-selected angle for a specific passenger cabin configuration during a par... | 09/26/1995 |
| 5362205 | Method and apparatus for synchronizing the speed and phase of plural propellers of an aircraft A propeller control system (1) includes a propeller controller (6) the gain of which is set by a look up table (2) in response to airspeed data supplied by an airspeed detector (4). By varying the gain of the propeller controller (6) an overall system gai... | 11/08/1994 |
| 5352090 | System for determining aerodynamic imbalance A system is provided for determining tracking error in a propeller or rotor driven aircraft by determining differences in the aerodynamic loading on the propeller or rotor blades of the aircraft. The system includes a microphone disposed relative to the b... | 10/04/1994 |
| 5335175 | Propeller control system A propeller control system comprises a phase controller (11) having a phase control gain to control a propeller phase relationship, free air turbulence detection means (7, 9) and a gain controller (8) for varying the phase control gain in response to dete... | 08/02/1994 |
| 5331559 | Apparatus for preventing propeller overshoot To prevent propeller overshoot, a propeller governor control generates a signal which modifies a speed command issued to a propeller governor. The signal causes the propeller governor to change blade pitch before the propeller reaches its commanded speed.... | 07/19/1994 |
| 5290147 | Variable pitch marine propeller with shift biasing and synchronizing mechanism A marine propeller includes a hub rotatable about a longitudinal axis and having a plurality of blades extending radially outwardly therefrom and pivotable about respective radial pivot axes between a low pitch position and a high pitch position. A disc h... | 03/01/1994 |
| 5291410 | Circuitry for synchronizing the speed of a plurality of engines by sequentially averaging phase difference with a reference phase representing a desired speed A control circuit for synchronizing the speed of a plurality of engines of an aircraft. The control circuit includes first and second counters for counting pulses in a reference pulse train and an engine speed pulse train over a predetermined time interva... | 03/01/1994 |
| 5221185 | Method and apparatus for synchronizing rotating machinery to reduce noise 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 ... | 06/22/1993 |
| 5148402 | Method for reducing aircraft cabin noise and vibration The rotation of N-bladed propellers of a multi-engine aircraft is controlled by phase angle synchronizer 30 such that a predetermined phase angle offset $c;3 is maintained between the blades of a first propeller 10 and the blades of a second propeller ... | 09/15/1992 |
| 5129785 | Automatic variable discrete pitch marine propeller A self-actuating variable pitch marine propeller which incorporates two or more blades having cylindrical shafts which are rotatably connected to a central hub via cylindrical joints; the blades rotate about and translate radially, relative to the hub cen... | 07/14/1992 |
| 5093791 | Variable gain synchrophasing An aircraft engine propeller synchrophasing system (4) has a gain stage (8) which varies the gain of the system (4) according to the magnitude of the difference between the preferred propeller relative phase and the measured propeller relative phase.... | 03/03/1992 |
| 5042965 | Propeller synchrophaser control with trajectory logic An apparatus for controlling the phase of a slave propeller relative to that of a master propeller is shown and described. A logic means having a trajectory function, F($c;E), which defines the region for phase holding, i.e. where the error ... | 08/27/1991 |
| 5027277 | Method for synchrophaser measurement and synchrophaser control A method and apparatus for providing improved phase error measurement as shown and described. The measured phase error ($c;E) is used as an input to a SYNCHROPHASER.RTM. control which provides for phase control of a slave propeller with resp... | 06/25/1991 |
| 4934825 | Propeller phase control apparatus Propeller phase control apparatus for use on multi-engine aircraft having, for each engine, an electronic engine control (EEC) for providing an EEC command speed and phase (S/P) signal to control propeller phase and shaft speed, and a speed and phase cont... | 06/19/1990 |
| 4928241 | Aircraft propeller control In the invention, the speeds of both propellers in a counterrotating aircraft propeller pair are measured. Each speed is compared, using a feedback loop, with a demanded speed and, if actual speed does not equal demanded speed for either propeller, pitch ... | 05/22/1990 |
| 4659283 | Propeller Synchrophaser.RTM. device and mode logic An improved slave propeller SYNCHROPHASER.RTM. device and mode logic for a multi-propeller aircraft is disclosed. A designated master propeller has at least one associated slave propeller which has its speed and phase controlled with respect to the master... | 04/21/1987 |
| 4653981 | Propeller synchrophaser An improved slave propeller synchrophaser (10) includes a first control (14) responsive to a phase difference signal (28) and a phase difference reference signal (26) for providing a phase error signal (112) and for providing a propeller speed reference b... | 03/31/1987 |
| 4245955 | Phase and speed control system A phase and speed control system for synchronizing the speed and controlling the phase relationship between a pair of aircraft engines, each engine having associated therewith a centrifugal governor, includes a phase comparator circuit which provides a pu... | 01/20/1981 |
| 4142697 | Mechanism for synchronously varying diameter of a plurality of rotors and for limiting the diameters thereof A plurality of variable diameter rotors with mechanism for varying the diameter of the rotors synchronously, and including mechanism to limit the diameter of the rotors.... | 03/06/1979 |
