Class / Patent application number | Description | Number of patent applications / Date published |
416145000 | Self-shifting or selectively adjustable mass | 26 |
20090004008 | Blade mounting - Turboprop and propfan engines generally incorporate blades which have variable pitch to improve operational efficiency. Variable pitch is achieved through a pitch control mechanism at the root of the blade but such mechanisms may fail resulting in the blades turning to define a flat configuration with low drag and therefore the potential for engine damage through over-speeding. Traditional pitch lock and counter weight control mechanisms have disadvantages. By providing a helical bearing in which the mass and radial movement due to centrifugal radial force are utilised it is possible to generate a counter moment to the normal centrifugal turning moment (CTM) to ensure the blade remains in a configuration with at least some drag to limit engine rotational speed. The continuous helical bearing allows for a range of pitch angular positions to be used around a full 360° turn by providing a feathering counter moment from any of those angular positions. | 01-01-2009 |
20090035137 | Helicopter vibration control system and rotary force generator for canceling vibrations - Helicopter rotating hub mounted vibration control system for a rotary wing hub having periodic vibrations while rotating at an operational rotation frequency. The vibration control system includes a housing attachable to the rotary wing hub and rotating with the hub at the operational frequency. The housing is centered about the rotary wing hub axis of rotation and has an electronics housing cavity subsystem and an adjacent rotor housing cavity subsystem. The rotor housing cavity contains a first coaxial ring motor with a first rotor and imbalance mass and a second coaxial ring motor with a second rotor and imbalance mass. The electronics housing cavity contains an electronics control system which receives sensor outputs and electrically controls and drives the first motor and the second motor such that the first imbalance mass and the second imbalance mass are driven at a vibration canceling rotation frequency greater than the operational rotation frequency wherein the helicopter rotary wing hub periodic vibrations are reduced. | 02-05-2009 |
20090129926 | MASS POD TURBINE SYSTEM - A mass pod turbine device includes a rotating element configured to rotate about a shaft axis. A plurality of mass pods restrained about the periphery of the rotating element. The mass pods are restrained to the rotating element, but may be displaced relative to the center of rotation. During a rotational cycle of the rotating element, the mass center of each mass pod may be dynamically displaced relative to the center of rotation. The mass pods then generating a mass imbalance about the rotational axis and causing the device to rotate about the shaft axis. The system also provides a useful variable inertia member for the storing of the kinetic energy of a rotating assembly. | 05-21-2009 |
20090148289 | ACTIVE DAMPER AGAINST GENERATOR BASE FRAME VIBRATIONS - A damper system for damping base frame vibrations of a wind turbine having a tower, a nacelle, a frame in the nacelle, at least one rotor blade, and a generator, the damper system includes a mass for damping vibrations of the frame, wherein the mass is positioned outside a vibration center and at least one drive mechanism adapted for actively controlling a movement of the mass. A method for reducing frame vibrations of a wind turbine is provided. | 06-11-2009 |
20090169384 | METHODS AND SYSTEM FOR BALANCING TURBINE ROTOR ASSEMBLIES - A balancing system and method for reducing imbalance in a rotatable member of a machine is provided. The system includes a plurality of vibration sensors positioned about a stationary portion of the machine, a controller assembly communitively coupled to the plurality of vibration sensors, and a balancing assembly coupled to the rotatable member, said balancing assembly configured to wirelessly communicate with said controller assembly, said balancing assembly configured to modify the weight distribution of the rotatable member in response to a command wirelessly transmitted from the controller assembly. The controller assembly is configured to receive data from the plurality of vibration sensors and determine an imbalance in the rotatable member using the received data. | 07-02-2009 |
20100021302 | Blade Arrangement - A blade arrangement with a rotor and a plurality of blades which are arranged on the periphery of the rotor in a ring and a plurality of damping elements are provided. Between two directly adjacent blades at least two damping elements are arranged in series in the circumferential direction of the rotor. As a result of a centrifugal force, which acts in the radial direction, during a rotation of the rotor around a rotor axis adjacent damping elements come into contact with each other, and one of the two damping elements comes into contact with one of the two blades and the other of the two damping elements comes into contact with the other of the two blades. | 01-28-2010 |
20100021303 | Wind Turbine Comprising One Or More Oscillation Dampers - A wind turbine includes one or more oscillation dampers, each damper having one or more closed cavities arranged within a blade of the wind turbine and containing a large number of solid elements that are arranged to move freely within the cavities. | 01-28-2010 |
20100034655 | 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 rotating hub mounted vibration control system rotating with the rotating rotary wing hub. The vehicle vibration control system includes a rotary wing aircraft member sensor for outputting rotary wing aircraft member data correlating to the relative rotation of the rotating rotary wing hub member rotating relative to the nonrotating body, at least a first nonrotating body vibration sensor, the at least first nonrotating body vibration sensor outputting at least first nonrotating body vibration sensor data correlating to vibrations, at least a first nonrotating body circular force generator, the at least a first nonrotating body circular force generator fixedly coupled with the nonrotating body, a distributed force generation data communications network link, the distributed force generation data communications system network link linking together at least the first nonrotating body circular force generator and the rotating hub mounted vibration control system wherein the rotating hub mounted vibration control system and the first nonrotating body circular force generator communicate force generation vibration control data through the distributed force generation data communications network, the at least first nonrotating body circular force generator controlled to produce a rotating force with a controllable rotating force magnitude and a controllable rotating force phase, the controllable rotating force magnitude controlled from a minimal force magnitude up to a maximum force magnitude, and with the controllable rotating force phase controlled in reference to the rotary wing aircraft member sensor data correlating to the relative rotation of the rotating rotary wing hubrotating relative to the nonrotating body wherein the vibration sensed by the at least first nonrotating body vibration sensor is reduced. | 02-11-2010 |
20100296931 | DISTRIBUTED-MASS DEVICE FOR REDUCING VIBRATION GENERATED BY A ROTORCRAFT LIFT ROTOR, AND A ROTOR HUB FITTED WITH SUCH A DEVICE - A distributed mass device for reducing the vibration generated by a rotor, includes a support suitable for being constrained in rotation about an axis of rotation of the lift rotor. The distributed mass device further includes at least two main oscillating masses each provided with a through longitudinal recess, and each being connected to the support by respective deformable elements, the main oscillating masses being constrained to move solely in a horizontal plane by the deformable elements. The distributed mass device is provided with a secondary oscillating mass per main oscillating mass, each secondary oscillating mass being suspended inside the recess of the associated main oscillating mass by resilient elements. | 11-25-2010 |
20110027085 | AXIAL BALANCING CLIP WEIGHT FOR ROTOR ASSEMBLY AND METHOD FOR BALANCING A ROTOR ASSEMBLY - A balancing weight clip for balancing a rotor assembly of a gas turbine engine which includes a weight portion, and a first flange engaging portion and a second flange engaging portion extending from the weight portion. The weight portion and the first and second flange engaging portions define a flange receiving opening for receiving a flange of a disc of the rotor assembly. The first flange engaging portion is provided with a detent facing the second flange engaging portion and engageable with a mating groove provided on a face of the flange. At least one of the first and second flange engaging portions is elastically deformable so that the first and second flange engaging portions are elastically moveable away from one another to removably receive the flange in the flange receiving opening and engage the detent with the mating groove. | 02-03-2011 |
20110070085 | INTERNALLY DAMPED BLADE - A blade includes an airfoil portion which defines at least one cavity with a damper located within the cavity, the damper includes a corrugated surface. | 03-24-2011 |
20110164977 | VERTICAL-AXIS WIND TURBINE - A vertical axis wind turbine having a vertical rotating axle and a plurality of blades each attached to an upper portion to the rotating axle and at the bottom portion to a convex base dome attached to and rotable with the vertical axle. Each blade wraps around the vertical axle and has a radial width that increases from its upper portion to its lower portion while supporting an open brow section forming a cup-like space and a wedge-like stiffener section. | 07-07-2011 |
20110217171 | ACTIVE FORCE GENERATION SYSTEM FOR MINIMIZING VIBRATION IN A ROTATING SYSTEM - A method and device for reducing vibratory noise in a system with an integral rotating member includes independently operable drive systems for controlling the angular velocity of at least two independently rotatable masses. Control signals manipulate the drive system to rotate each mass at optimal speed, direction and phase to reduce noise induced in the system by the rotating member. | 09-08-2011 |
20110268573 | DEVICE FOR REDUCING THE VIBRATION GENERATED BY A ROTORCRAFT LIFT ROTOR, AND A ROTOR HUB PROVIDED WITH SUCH A DEVICE | 11-03-2011 |
20120107120 | COOLING FAN AND ROTOR OF COOLING FAN - A cooling fan includes a frame and a rotor received in the frame. The rotor includes a hub, blades extending outwardly and radially from the hub, and a cover plate connected with the hub. The hub includes a top wall and a sidewall extending from a circumference of the top wall. The top wall of the hub defines a plurality of blind holes on an outer surface thereof, and the blind holes are shaded by the cover plate. | 05-03-2012 |
20120128492 | ADJUSTMENT DEVICE FOR A ROTATING BODY AND ROTATING BODY - The invention relates to an adjustment device ( | 05-24-2012 |
20120207603 | TRAPPED SPRING BALANCE WEIGHT AND ROTOR ASSEMBLY - A balance weight for a turbine rotor includes: a block-like centerbody; a pair of resilient spring arms extending laterally from opposite sides of the centerbody, the centerbody and the spring arms collectively defining an arcuate shape; at least one locating structure extending from a radially outer surface of the balance weight; and a limit tab extending radially inward from a distal end of each of the spring arms. | 08-16-2012 |
20130011260 | VIBRATION REDUCTION DEVICE AND VIBRATION REDUCTION METHOD - A vibration reduction device according to the present invention includes: an elastic body; a dynamic mass; and a controllable mass. The dynamic mass is supported by an object of vibration reduction through the elastic body. The actuator causes the controllable mass to move with respect to the dynamic mass. Such a vibration reduction device can vary the frequency and the amplitude at which the dynamic mass vibrates with respect to the object of vibration reduction by causing the controllable mass to move appropriately with respect to the dynamic mass, thereby enabling the vibration of the object of vibration reduction to be reduced more reliably. In addition, such a vibration reduction device can reduce vibration of a certain frequency of the object of vibration reduction even when the controllable mass is fixed with respect to the dynamic mass. | 01-10-2013 |
20130039765 | AIRCRAFT PROPELLERS - An aircraft propeller taper bore insert apparatus includes an outer surface, the outer surface dimensioned and configured to fit within an aircraft propeller taper bore or an aircraft propeller balancing tube, and an inner surface, the inner surface defining an inner cavity configured to receive a balancing medium, the inner surface comprising a plurality of retention formations arranged thereon, and the plurality of retention formations being configured to support the balancing medium. | 02-14-2013 |
20130071245 | ROTOR WITH IMPROVED BALANCING FEATURES - A rotor assembly for a gas turbine engine including a circumferential array of regularly spaced apart features provided on the disk which are each configured for receiving a balancing weight. The circumferential array of features has an angular orientation relative to the circumferential array of blades such that the features are each located at an at least substantially same offset angle from a stacking line of a respective adjacent blade. | 03-21-2013 |
20130189105 | VIBRATION ABSORBING DEVICE FOR A WIND TURBINE AND METHOD OF ABSORBING VIBRATIONS IN A WIND TURBINE - A wind turbine is provided including a nacelle housing a power train of the wind turbine. The power train of the wind turbine includes a gearbox, a generator, and one or more rotatable shafts, each including a radial direction and an axial direction. Further, the wind turbine includes a vibration absorbing device being arranged on a shaft of the power train. The vibration absorbing device includes an energy storing arrangement, which includes a flexible element and a mass assembly. The vibration absorbing device is connected to the shaft in an axially symmetric way. | 07-25-2013 |
20130294913 | TURBINE BLADE WITH TUNED DAMPING STRUCTURE - A turbine blade is provided comprising: a root; an airfoil comprising an external wall extending radially from the root and having a radially outermost portion; and a damping structure. The external wall may comprise first and second side walls joined together to define an inner cavity of the airfoil. The damping structure may be positioned within the airfoil inner cavity and coupled to the airfoil so as to define a tuned mass damper. | 11-07-2013 |
20140086750 | ADJUSTABLE PAYLOAD ENCLOSURE FOR WING - An enclosure for carrying an adjustable payload. The enclosure is beneficially used on a rotorcraft blade or other similar structure. The enclosure has a first element having a first flange and an upper element. The first element has an upper surface which has a first angle with respect to a lower surface of the first flange in a direction extending from an inboard direction to an outboard direction. The upper element has a lower surface which has a second angle with respect to an upper surface of said upper element in a direction extending from an inboard direction to an outboard direction, the lower surface being in contact with the upper surface of said first element, the second angle being in a direction which is opposite to the direction of said first angle. The first element and the upper element define a cavity for holding a payload. | 03-27-2014 |
20150132131 | ROTOR BALANCING APPARATUS - A balancing apparatus for a rotary element is provided and includes a central hub portion and radial elements extending outwardly from the central hub portion. The balancing apparatus includes a conduit extending along the radial elements via the central hub portion, a mass movable within the conduit between the radial elements via the central hub portion and a mass balancing system which directs a movement of the mass within the conduit into and out of the central hub portion and along the radial elements. | 05-14-2015 |
20150132132 | ROTOR BALANCING APPARATUS - A balancing apparatus for a rotary element is provided and includes a central hub portion and radial elements extending outwardly from the central hub portion. The balancing apparatus includes a conduit extending along the radial elements via the central hub portion, a mass movable within the conduit between the radial elements via the central hub portion and a mass balancing system which directs a movement of the mass within the conduit into and out of the central hub portion and along the radial elements. | 05-14-2015 |
20150292478 | ROTOR BLADE ASSEMBLY HAVING INTERNAL LOADING FEATURES - Rotor blade assemblies and wind turbines are provided. A rotor blade assembly includes a rotor blade having exterior surfaces defining a pressure side, a suction side, a leading edge and a trailing edge each extending between a tip and a root, the rotor blade defining a span and a chord, the exterior surfaces defining an interior of the rotor blade. The rotor blade assembly further includes a loading assembly, the loading assembly including a weight disposed within the interior and movable generally along the span of the rotor blade, the weight connected to a rotor blade component such that movement of the weight towards the tip causes application of a force to the rotor blade component by the weight. Centrifugal force due to rotation of the rotor blade biases the weight towards the tip. | 10-15-2015 |