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| Number | Title | Issue Date |
| 8105029 | Method and apparatus for prediction-based wind turbine control A method an apparatus of automatically controlling a wind turbine re provided. of: A time-series of measurement values of the aerodynamic flow property of the wind turbine rotor blade is determined; a predictive wind field model representing a structure of a wind fi... | 01/31/2012 |
| 7988414 | Method and system for operating a wind turbine generator A method of operating a wind turbine generator having at least one wind turbine blade includes increasing a pitch angle of the at least one wind turbine blade as the at least one wind turbine blade rotates through a first range of blade azimuth values. Such increasi... | 08/02/2011 |
| 7530787 | Rotor hub fairing system for a counter-rotating, coaxial rotor system A rotor hub fairing system includes an upper hub fairing, a lower hub fairing and a shaft fairing therebetween. The rotor hub fairing system reduces the total drag on a dual, counter-rotating, coaxial rotor system. Other aerodynamic structures may be mounted to the ... | 05/12/2009 |
| 7293959 | Wind turbine blade with lift-regulating means Wind turbine blade (10) including adjustable lift-regulating means (12, 13, 15, 17, 19, 21) arranged on or at the surface of the wind turbine blade (10), said lift-regulating means being provided with activating means by means of which they can ... | 11/13/2007 |
| 7229251 | Rotor hub fairing system for a counter-rotating, coaxial rotor system A rotor hub fairing system includes an upper hub fairing, a lower hub fairing and a shaft fairing therebetween. The rotor hub fairing system is sized and configured to reduce the overall drag on a dual, counter-rotating, coaxial rotor system. Preferably, the rotor h... | 06/12/2007 |
| 7223071 | Device for providing assistance to the pilot of a rotorcraft in the event of engine failure The present invention provides a device enabling the collective pitch of the blades of the main rotor of a single-engined rotorcraft to be reduced automatically in the event of an engine failure. The device comprises an actuator which increases the collective pitch ... | 05/29/2007 |
| 7210651 | Compact co-axial rotor system for a rotary wing aircraft and a control system therefor A dual, counter rotating, coaxial rotor system provides an upper and lower rotor system, with a reduced axial rotor separation distance along a common axis by way of rotor tip position sensing and rotor position controls to avoid tip contact. ... | 05/01/2007 |
| 7204673 | Method of controlling a wind power installation A method for controlling a wind power installation at very high wind speeds, in which there is predetermined a first wind speed at which the rotor blades of the wind power installation are put into a first predetermined setting. In addition, the method includes cont... | 04/17/2007 |
| 7165746 | Vibration motor primary flight control actuator The invention provides an actuator for a control surface (7), in particular for a primary flight control of an aircraft, the actuator including a main actuator (3) in a main control line (1) for actuating the control surface (7), the actu... | 01/23/2007 |
| 7160083 | Method and apparatus for wind turbine rotor load control Vertical and horizontal wind shears, yaw misalignment and/or turbulence act together to produce asymmetric loading across a wind turbine rotor. The resultant load produces bending moments in the blades that are reacted through the hub and subsequently to the low-spe... | 01/09/2007 |
| 7083142 | Compact co-axial rotor system for a rotary wing aircraft and a control system thereof A dual, counter rotating, coaxial rotor system provides an upper and lower rotor system, with a reduced axial rotor separation distance along a common axis by way of rotor tip position sensing and rotor position controls to avoid tip contact. ... | 08/01/2006 |
| 7004724 | Method and apparatus for wind turbine rotor load control based on shaft radial displacement Vertical and horizontal wind shears, yaw misalignment and/or turbulence act together to produce asymmetric loading across a wind turbine rotor. The resultant load produces bending moments in the blades that are reacted through the hub and subsequently to the main sh... | 02/28/2006 |
| 6998729 | Wind energy plant having an observation platform The invention concerns a wind power installation comprising a rotor which is coupled to a generator within a machine housing. Such wind power installations have already long been known, for example the wind power installations of types E-40 and E-66 from Enercon, Au... | 02/14/2006 |
| 6361275 | Wind energy installation A wind power installation is disclosed comprising a rotor having at least one rotor blade for converting the kinetic energy of the wind into mechanical energy, an adjusting device for individually adjusting at least one rotor blade, a generator for conver... | 03/26/2002 |
| 6099254 | Helicopter rotor blade control device In a helicopter having three or more rotor blades, and with mechanical actuation of the rotor blades by a swash plate and a superimposed electrohydraulic active control system, in addition to three regulating units (18) is an actuator (4) between a rotata... | 08/08/2000 |
| 5921752 | Flat spine scorer and saddle stitcher An improved saddle stitching apparatus has dual scoring disks which cooperate with a scoring drum to create a flat spine on a cover. In one embodiment, a split ring is provided with two clamp arms, so that the ring can be releasably secured to the scoring... | 07/13/1999 |
| 5551649 | Propeller blade position controller System for reducing vibrations in the cabin of an aircraft driven by two or more propellers each having n blades (n being an integer equal or larger than 2) of which the relative phase angle can be adjusted, said system comprising synchrophase means for a... | 09/03/1996 |
| 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 |
| 5295641 | Propeller blade position controller System for reducing vibrations in the cabin of an aircraft driven by two or more propellers each having n blades (n being an integer equal or larger than 2) of which the relative phase angle can be adjusted, said system comprising synchrophase means for a... | 03/22/1994 |
| 5150855 | Propeller blade position controller System for reducing vibrations in the cabin of an aircraft driven by two or more propellers each having n blades (n being an integer equal or larger than 2) of which the relative phase angle can be adjusted, said system comprising synchrophase means for a... | 09/29/1992 |
| 5058824 | Servo control system for a co-axial rotary winged aircraft A servo control system for a radio controlled co-axial rotor helicopter includes a receiver 4 to provide signals indicative of operator desired pitch, yaw, roll, and collective commands to an electronic mixer unit 30 which translates these command signals... | 10/22/1991 |
| 4952119 | Tip brake mechanism for a wind generator blade A tip brake is described for use on the blade of a wind generator so that the tip will be rotated relative to the remainder of the blade to slow the rotation of the rotor. The tip of the blade is rotatable, about its longitudinal axis, with respect to the... | 08/28/1990 |
| 4772179 | Aircraft thrust control An integrated control system for coaxial counterrotating aircraft propulsors driven by a common gas turbine engine. The system establishes an engine pressure ratio by control of fuel flow and uses the established pressure ratio to set propulsor speed. Pro... | 09/20/1988 |
| 4772180 | Aircraft thrust control An integrated control system for coaxial counterrotating aircraft propulsors driven by a common gas turbine engine. The system establishes an engine pressure ratio by control of fuel flow and uses the established pressure ratio to set propulsor speed. Pro... | 09/20/1988 |
| 4772181 | Bladed rotor assembly and a control system therefor A counterrotatable bladed rotor assembly drivable by a rotatable shaft comprises a leading propeller, a trailing propeller, and a gearbox located axially between the two propellers and enclosed by a non-rotatable casing having an end for attachment to a s... | 09/20/1988 |
| 4514142 | Power management process A power management system is disclosed for an advanced helicoptor having h lift and thrust propulsion units and at least one power plant which comprises, a signal generator for generating a first signal which is proportional to the power available from t... | 04/30/1985 |
| 4488851 | Power management system A power management system is disclosed for an advanced helicopter having h lift and thrust propulsion units and at least one power plant which comprises, a signal generator for generating a first signal which is proportional to the power available from t... | 12/18/1984 |
| 4411595 | Control system for gas turbine engine A gas turbine engine control system is provided. In a preferred control system for use in combination with a helicopter, input signals respectively representative of power turbine speed error, power turbine shaft torque, and compressor shaft speed are emp... | 10/25/1983 |
| 4272041 | Model helicopter device A model helicopter device wherein a countertorque generated in the helicopter body by changes in the revolution of a main rotor is canceled by substantially detecting the acceleration of the revolution of the main rotor and automatically adjusting the pit... | 06/09/1981 |
| 4008979 | Control for helicopter having dual rigid rotors A control for a helicopter having dual, coaxial, counterrotating rigid rotors which varies the cyclic control phase angle of each rotor in flight as a function of vehicle forward speed to thereby control the coupling of lateral cyclic pitch with longitudi... | 02/22/1977 |
| 3963372 | Helicopter power plant control A control system for a helicopter power plant with three power units driving the lifting rotor system. Each power unit comprises a gas-coupled gas turbine engine, a hydromechanical fuel control receiving electrical inputs to set a gas generator governor, ... | 06/15/1976 |
