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...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 8186948 | Wind energy plant with a central control device and a control unit in the rotor and method for the operation of such a wind energy plant A wind energy plant with a nacelle, a rotor, which features at least one rotor blade adjustable in its blade pitch angle, a central control device for controlling the wind energy plant and a control unit disposed in the rotor for controlling the blade pitch angle of... | 05/29/2012 |
| 8182221 | Turbine blade with tip sealing and cooling A turbine rotor blade with a tip region cooling and sealing circuit that includes a squealer tip with a continuous tip rail, the pressure side tip rail being offset from the pressure side wall, the pressure ad suction side tip rails both include concave shaped defle... | 05/22/2012 |
| 8177505 | Method for measuring a rotational position of a rotor blade of a wind turbine and measuring device The present disclosure is related to a method and a measuring device adapted for determining a rotational position of at least one rotor blade of a wind turbine. The method includes a step of measuring a gravity induced blade moment of the at least one rotor blade. ... | 05/15/2012 |
| 8172530 | Pitch change actuation system for a counter-rotating propeller A system for adjusting the pitch of a counter-rotating propeller has a propeller shaft, a forward propeller driven by the propeller shaft, and an aft propeller connected with the forward propeller. The forward propeller has a hub, blades mounted within the hub, and ... | 05/08/2012 |
| 8172529 | Method of operation of a high-efficiency turbine with variable attack angle foils Operations of a turbine to generate energy from a relatively slow fluid flow, such as wind and water, are described. The turbine has a plurality of foils rotating about a central axis at a rotational velocity, each of the foils having a length and a foil axis parall... | 05/08/2012 |
| 8167553 | Electrical system for driving a propeller pitch change mechanism A system adjusts the pitch of a variable pitch propeller having a non-rotating side and a rotating side. The rotating side of the propeller has a hub, a propeller blade mounted to the hub, a propeller shaft that rotates the hub and propeller blade, and an actuation ... | 05/01/2012 |
| 8162606 | Helicopter hub mounted vibration control and circular force generation systems for canceling vibrations A rotary wing aircraft including a vehicle vibration control system. The vehicle vibration control system includes a rotating hub mounted vibration control system, the rotating hub mounted vibration control system mounted to the rotating rotary wing hub with the rot... | 04/24/2012 |
| 8157521 | Wind turbine generator and method of controlling the same There is provided a wind turbine generator and a method of controlling the same which can prevent the decline in power generation efficiency even when the generator is located where the wind is not always strong. The wind turbine generator mainly includes an anemome... | 04/17/2012 |
| 8152463 | Method for impingement air cooling for gas turbines In impingement air cooling of gas turbine components, cooling air velocity packs of a certain amplitude and a given frequency are applied to impingement air openings, with intervallic annular swirl structures being formed which penetrate a cross-flow and hit a compo... | 04/10/2012 |
| 8142153 | Turbine vane with dirt separator A turbine stator vane with a cooling circuit that improves the cooling effectiveness of the airfoil as well as collects any dirt particles before passing the clean cooling an through the cooling circuit. The airfoil includes a 3-pass aft flowing serpentine circuit w... | 03/27/2012 |
| 8133023 | Wind turbine with variable area propeller blades An apparatus and method for reducing wind turbine damage includes a propeller having a plurality of blades projecting radially from a hub. The blades may be adjustably combined to form variable cross-sections that either increase or decrease propeller rotation speed... | 03/13/2012 |
| 8133024 | Turbine blade with root corner cooling The turbine rotor blade with an aft flowing serpentine flow cooling circuit that discharges into a trailing edge cooling circuit and then into a row of exit cooling slots to cool the trailing edge, in which a vortex cooling chamber is formed in the blade platform an... | 03/13/2012 |
| 8128362 | Method of operating a wind turbine, a wind turbine and a cluster of wind turbines A method of operating a wind turbine above a predefined wind velocity comprising the step of operating a control parameter of the wind turbine within a tolerance band from a reference set-point curve of that control parameter. A wind turbine and a cluster of wind tu... | 03/06/2012 |
| 8128361 | Control modes for extendable rotor blades A wind turbine may be controlled in a variety of manners to optimize operating parameters. In one arrangement, for example, the length or the pitch of a wind turbine rotor blade may be adjusted to avoid harmonic resonance frequencies. In another example, the length ... | 03/06/2012 |
| 8123478 | Systems and methods for monitoring a condition of a rotor blade for a wind turbine A method for monitoring a condition of a rotor blade of a wind turbine is provided. The method includes transmitting, from a sensor to a controller, at least one monitoring signal indicative of a vibration of the rotor blade. The condition of the rotor blade is calc... | 02/28/2012 |
| 8123476 | Method for regulating a wind energy installation A method of operating installations (10), in particular wind energy installations (10), having a component (22) which endangers flying animals, in which the component assumes a first state which endangers animals to a greater extent and a second... | 02/28/2012 |
| 8123477 | Control of rotor during a stop process of a wind turbine A method for controlling a wind turbine rotor during a stop process by pitching the rotor blades fast, e.g. with an angular rate of 10-15°/s to a no-thrust position, after which the rotor blades are pitched to maintain the no-thrust or a thrust against the directio... | 02/28/2012 |
| 8118552 | Apparatus and method for manipulating a component of a wind turbine A wind turbine includes a tower member a yaw system, and a wind energy collection system. The wind energy collection system includes a central hub and a plurality of blade members. The wind turbine further includes a component manipulating system operatively coupled... | 02/21/2012 |
| 8113776 | Reduced-impedance cooling system with variable pitch blade and hot-swappable spare A method of operating variable pitch fans in series to cool an operating computer system. The method comprises running a first variable pitch fan with blades positioned at an operational pitch to induce airflow through the computer system and through a second variab... | 02/14/2012 |
| 8109722 | Turbine and system for generating power from fluid flow and method therefor A turbine for use with a turbine generator, the turbine including at least one turbine blade for positioning in a flowpath, a hub mounting the at least one turbine blade, and a rotatable shaft in operational communication with the hub via a hinge assembly, an axis o... | 02/07/2012 |
| 8105028 | Systems and methods for mitigating the effects of wind turbines on radar A control system for mitigating the effects of a wind turbine on a radar system is disclosed. The control system includes a sensor configured to detect an operating condition of the radar system; a processor configured to receive an operating condition of the wind t... | 01/31/2012 |
| 8100648 | Submersible rotor design An improved rotor blade used in combination with a submersible electrical generator comprises a rotor base with width BW, a leading edge, a tip, and a trailing edge. The leading edge and the trailing edge are defined as elliptical curves having a radius of 8.0 BW. T... | 01/24/2012 |
| 8100647 | Method for operating a wind turbine, a wind turbine and use of the method A method for operating a wind turbine having a rotor with a number of wind turbine blades, wherein the rotor's axis of rotation is tilted in relation to the direction of the incoming wind, includes the steps of determining the azimuth angle (A) of the blades and adj... | 01/24/2012 |
| 8096761 | Blade pitch management method and system A method for operating a wind turbine. The method includes providing a wind turbine having at least one blade having adjustable pitch angle that is adjusted according to an operational parameter schedule. A blade efficiency parameter is determined in response to a w... | 01/17/2012 |
| 8096762 | Wind turbine with pitch control arranged to reduce life shortening loads on components thereof A wind turbine is presented where the operation lifetime of the main bearing is extended by relieving the main bearing by reducing the mean bending moment on the bearing by means of individual pitch control of the blades of the rotor so as to create an aerodynamic m... | 01/17/2012 |
| 8092172 | Method for operating a wind turbine with reduced blade fouling A method of operating a wind turbine is provided. The wind turbine has at least one rotor blade and an active flow control (AFC) system. The at least one rotor blade has at least one aperture defined through a surface thereof, and the AFC system is configured to mod... | 01/10/2012 |
| 8092173 | Wind turbine control method A method of controlling a wind turbine, where a control signal for a controllable parameter of the wind turbine is determined repeatingly at successive time steps, and a control history including respective control values derived from or included in past control sig... | 01/10/2012 |
| 8092171 | Systems and methods for assembling a pitch assembly for use in a wind turbine A method of assembling a wind turbine. The method includes coupling a pitch bearing to a hub that includes a wall. The pitch bearing includes a plurality of sets of pitch bearing teeth. At least one blade is coupled to the pitch bearing such that the blade is rotata... | 01/10/2012 |
| 8083481 | Method for siting and operating a crop protection wind machine array A system for arranging and operating an array of wind machines to protect crops from damaging weather conditions, such as freezing frost, rain and heat. The method includes a wind machine positioned to force air across the crop. The wind machine is preferably a prop... | 12/27/2011 |
| 8070436 | Cooling airflow modulation A gas turbine engine airfoil (22) has a wall (42) provided with a cooling effusion hole (40) therein to facilitate film cooling of the external surface (52) of the wall (42). A member (46) attached to the internal surface ( | 12/06/2011 |
| 8070437 | Method for damping edgewise oscillations in one or more blades of a wind turbine, an active stall controlled wind turbine and use hereof A method for damping edgewise oscillations in one or more blades of a wind turbine includes the steps of detecting if one or more of the blades oscillates edgewise during operation of the wind turbine, and substantially cyclically generating a pitch angle difference... | 12/06/2011 |
| 8066478 | Preventing hot-gas ingestion by film-cooling jet via flow-aligned blockers A system for cooling includes a surface to be cooled, at least one film-cooling hole within the surface for allowing a film cooling jet of coolant to reach the surface, each of the at least one film-cooling hole having a diameter and at least two spaced apart flow-a... | 11/29/2011 |
| 8066479 | Non-integral platform and damper for an airfoil A section of a gas turbine engine includes a damper which extends from a disk between a first blade and a second blade to provide a dissipating vibratory motion energy in the form of friction heating. ... | 11/29/2011 |
| 8047784 | Lift device for rotor blade in wind turbine A lift device for a rotor blade and a method for increasing the lift of a rotor blade for a wind turbine are disclosed. The rotor blade has exterior surfaces defining a pressure side and a suction side extending between a leading edge and a trailing edge. The lift d... | 11/01/2011 |
| 8047783 | Systems and method for operating an active flow control system A method performed by a control system for operating a wind turbine includes operating a flow control system of the wind turbine in a first mode, and operating the flow control system in a second mode different than the first mode to facilitate removing debris from ... | 11/01/2011 |
| 8043054 | Method and system for monitoring wind turbine A monitoring system for a wind turbine includes at least one acoustic sensor configured to measure an acoustic emission generated by at least one component of the wind turbine, and a control system configured to calculate at least one wear characteristic of the comp... | 10/25/2011 |
| 8043053 | Self locking trim tab A trim tab assembly includes first and second shape memory alloy (SMA) actuators and a trim tab substrate which provide elastic/plastic locking in response to an induced strain actuation. ... | 10/25/2011 |
| 8038396 | Vortex generator assembly for use with a wind turbine rotor blade and method for assembling a wind turbine rotor blade A method of manipulating a boundary layer across a wind turbine rotor blade. The method includes coupling at least one vortex generator to the rotor blade. The vortex generator includes at least one sidewall that extends outwardly a radial distance from an outer sur... | 10/18/2011 |
| 8038394 | System and method of damping a 1P motion A rotor system includes a multiple of rotor blade yokes mounted to a rotor hub. A lead/lag damper is mounted to each of the rotor blade yokes and to a damper hub. An actuator system is operable to shift a damper hub axis of rotation relative the rotor axis of rotati... | 10/18/2011 |
| 8038395 | Pulsed torque control of wind turbine pitch systems A wind turbine pitch control system is disclosed that provides a pulsed torque to the blade pitch actuator if continuous torque fails to adjust the blade pitch angle to a commanded pitch angle. This invention provides a cost-effective way to increase peak torque cap... | 10/18/2011 |
