336 results about "Feathering" patented technology

A rotor for use on an aircraft has a plurality (N) of rotor blades mounted on a plurality (N) of concentric masts. Each of the rotor blades has a rounded leading edge and a tapered trailing edge. The plurality (N) of concentric masts each operably mount one of the plurality of rotor blades at N different elevations. A locking element selectively locks or unlocks the concentric masts together in a plane of rotation, enabling the angle between any two rotor blades to be variable from 0-360 degrees during flight. A feathering hinge is operably attached to each blade for changing the pitch of each blade with respect to the plane of rotation as controlled by a pitch control mechanism.

A receptor medium with a sheet having an embossed imaging surface as one major surface thereof The receptor medium can receive jettable materials, which include inks, adhesives, biological fluids, chemical assay reagents, particulate dispersions, waxes, and combinations thereof. The embossed medium unexpectedly solves such common inkjet printing problems as feathering, banding, and mudcracking in inkjet printing systems by controlling how an inkjet drop contacts and dries on an inkjet receptor medium. Clear lines of demarcation between adjoining colors of a pigmented inkjet image graphic can be obtained, Methods of making and using the inkjet receptor medium are also disclosed.

Multi-wing hovering and gliding flapping Micro Air Vehicles (“MAV”) are disclosed. The MAV can have independent wing control to provide enhance energy efficiency and high maneuverability. Power to each wing can be controlled separately by varying the amplitude of the wing flapping, the frequency of the wing flapping, or both. The flapping frequency can be controlled such that it is at or near the natural frequency of the wings for improved energy efficiency. The wings can be controlled by a gear train, coil-magnet arrangement or many other actuation systems that enable variable frequency flapping, variable amplitude flapping, or a combination of both. The gear train mechanism provides gyroscopic stability during flight. The wing flapping can include a rotation, or feathering motion, for improved efficiency. The wings can be transitioned between flapping flight and fixed wing flight to enable gliding and hovering in a single configuration.

A vehicle with wings and a mechanism for causing a flapping motion in wings. Each wing structure comprises a wing and a wing spar coupled to a follower via a resilient member. Each wing carrier is pivotally connected to the body and is configured to restrain lateral movement and permit rotation of the wing spar about a feathering axis. A biasing member provides torsional bias to each wing spar. A linkage, driven by an actuator, transmits cyclic motion that rotates the wing carrier about a flapping axis, which moves the follower along a follower path. A guide attached to the vehicle body lies in the path of each follower, and the follower and guide are shaped such that each wing spar has a first rotational position about its axis along a first portion of the follower path and a second rotational position along a second portion of the follower path.

In an ink jet recording method, a surface of a recording paper, in which a base paper contains a pulp fiber and a filler, one surface of the base paper being coated with a polyvalent metal salt in a coating amount of from 0.1 to 3 g/m², having a basis weight of from 63 to 100 g/m² and an internal bond strength of from 0.05 to 0.2 N·m is printed using an ink of at least one color made of at least a pigment, a water-soluble organic solvent, water and a surfactant and having a surface tension of from 25 to 37 mN/m. According to the method, the color reproduction is improved, the inter color bleeding and the feathering of characters are reduced, the double-sided printability is provided by reducing curling and cockling occurring immediately after printing, and curling and cockling occurring after allowing to stand and drying are also reduced.

In a wind turbine, an open loop control algorithm for incrementally or positively adjusting the pitch angles of individual rotor blades may be used to increase spacing between the base of the turbine tower and an approaching blade tip. As each rotating blade passes in front of the tower base, a minimum clearance distance may be assured to avoid blade tip strikes of the base. In accordance with at least one embodiment of the control algorithm, as each blade approaches the tower base, it may be feathered to reduce its power loading, and to facilitate increased clearance beyond the normal unloading or feathering produced by the so-called tower shadow effect. To offset resultant loss of torque, the remaining blades may be correspondingly pitched toward power, i.e. into the wind, to balance and/or smooth out the overall rotor torque curve, and thus to avoid torque ripples.

The present invention provides an ink set which includes a combination of a recording liquid including a resin-coated colorant, and a treatment liquid including a particle which has a reactivity with the resin-coated colorant. The ink set can obtain a high quality image free from feathering and color bleeding, can obtain a high quality image even when used for printing on a plain paper sheet, can obtain a print excellent in wear resistance, can obtain a high image density without causing a deep permeation of a recording liquid in the paper sheet, can perform a favorable double-sided printing with a low image density when the image is viewed from an opposite face of an image print face, can be free from an image stain attributable to drying failure of the recording liquid, and can provide the print with a proper glossiness.

Provided are ink jet ink excellent in dispersion stability and ejection stability and capable of forming images with fastness, abrasion resistance, color developability, and high density with little feathering; a microencapsulated pigment (MCP) providing the ink and a process of making the same; and an aqueous dispersion of the MCP. The MCP comprises pigment particles having a hydrophilic group on their surface (hydrophilized pigment particles) and coated with a polymer by emulsion polymerization. The process comprises emulsion polymerization in the presence of the hydrophilized pigment particles. The ink essentially contains the MCP and water.

The invention relates to an independent feathering control system and a control method for a wind driven generating set, wherein the control system comprises a sampling module, a control module and a driving module. A feathering motor in the driving module is connected with the blades of the wind driven generating set through a speed reducer. The sampling module is used to acquire the signals such as the wind driven generating set power, the boss rotating speed, the impeller position, the feathering angle, the paddle vibration, and the like, and to respectively send the acquired signals to the control module. The control module comprises a wind machine power controller for processing the wind driven generating set power signal and the boss rotating speed signal, a periodic unbalanced load compensation controller for processing the impeller position signal, the wind machine power signal and the boss rotating speed signal, a transient state impact load compensation controller for processing the feathering angle signal, the paddle vibration signal, the impeller position signal, the wind machine power signal and the boss rotating speed signal, and an output coupler for processing the signals outputted from the three controllers and comprehensively outputting the signals to the driving module.

The invention discloses a stand-by safety chain monitoring and protecting device for a wind power generation control system, comprising a power supply, a cable-twisting switch, an engine-room vibration protection switch, a grid protection switch, a converter protection switch, an engine room and tower support emergent stop button, a distributed heartbeat signal monitoring switch, a rotary speed protection switch and a safety chain relay, wherein the power supply generates power signals and is respectively connected in series with the cable-twisting switch, the engine-room vibration protection switch, the grid protection switch, the converter protection switch, the engine room and the tower support emergent stop button, the distributed heartbeat signal monitoring switch, the rotary speed protection switch and the safety chain relay. The monitoring and protecting device adopts an active safety design, runs independent of a PLC system and monitors relevant signals at real time; and when incidents endangering the safety of a machine set occur, the monitoring and protecting device actively controls a pitch system to realize full feathering, thereby achieving the safe shut-down of the machine set.

A starter strip shingle of a given vertical width is provided, having a severance line, from which a severance portion of the starter strip shingle may be removed, somewhat reducing the vertical width of the starter strip shingle, such that the installer of roofing material has an option to use full width starter strip shingles, or reduced width starter strip shingles, from the same package of uniform width starter strip shingles, to thereby enable a feathering of roofing shingles applied thereover, by means of a gentle transition zone, to avoid tears and punctures of the roofing shingles. Sealant areas on the starter strip shingles may be synchronized with the spacing and sizes of tabs of roofing shingles applied thereover, such that the sealant areas will always be under tabs of roofing shingles that are applied thereover, and not fall between the tabs into slots thereof.

The invention relates to a high gloss, non-feathering topical composition comprising at least one water-insoluble, fatty alcohol-soluble polysaccharide polymer and a liquid polymeric polyol ester.

The invention relates to a variable propeller pitch control system of a wind driven generator which is characterized in that the variable propeller pitch control system consists of a central control cabinet, a plurality of shaft cabinets connected in parallel and controlled by the central control cabinet as well as a group of DC motors and transmission devices which are singly controlled by each shaft cabinet; the central control cabinet includes a PLC control unit and a control interface. The PLC control unit of the system of the invention realizes the multiple functions of closing the loop at the rotating angle position of a blade, charge control for a battery, controlling the temperature of a box body, fault processing, etc. An upper computer transmits a single position signal to the PLC control unit; when an error does not happen or happens to the position signal, then the PLC control unit considers the error to be a fault and sends out a command duly to adjust the blade to a safe position, namely a feathering position, thereby simplifying the control procedure of the blade and increasing the running reliability of the blade; the driving of the blade is realized by the DC motor; the control characteristic is more stable due to linear control.

The invention discloses a wind turbine generator unit pitch system standby power supply online automatic detection method and device. The method comprises the following steps that A. detection parameter standards and relevant parameter standards for adopting standby power supply feathering are set, wherein the detection parameter standards comprise external constraint conditions and unit state conditions for starting detection; B. whether the external constraint conditions and the unit state conditions satisfy testing requirements or not is judged; C. if the external constraint conditions and the unit state conditions satisfy the testing requirements, standby power supplies start to be tested; D. a statistic analysis is conducted on detection data acquired by the step C, the detection data are compared with the set relevant parameter standards for standby power supply feathering, and if the detection data surpass the set standards, failure warning is carried out. The wind turbine generator unit pitch system standby power supply online automatic detection method and device can achieve performance detection of all wind turbine generator unit pitch system standby power supplies, are free of manual intervention and achieve online fault diagnosing or early warning through the modes of setting various parameter standards and time intervals of periodic detection.

A method for background replacement. The method takes an input image of one or more frames of video, or a still image, and performs an initial classification of the pixels (14) as foreground or background pixels. The classification is refined (16) using one of several techniques, including anisotropic diffusion or morphological filtering. After the refined classification is completed, a feathering process (18) is used to overlay the foreground pixels from the original image on the pixels of the new background, resulting in a new output image (20).

Disclosed a horizontal axis wind turbine including: a rotor; a nacelle; a tower; an independent pitch control device; and a yaw control device, wherein the horizontal axis wind turbine is an up-wind type one including a waiting mode, wherein (1) the independent pitch control device performs a first step of changing all the blades to be in feathering states when the wind speed exceeds the predetermined value, a second step of changing the blades to be in reverse feathering states one by one sequentially, and a third step of holding all the blades in the reverse feathering states, and (2) the yaw control device controls a yaw brake to take a braking value allowing the yaw rotation when the wind speed exceeds the predetermined value, wherein the rotor is allowed to swing a leeward of the tower by executing the control operations (1) and (2) as the waiting mode.

An aircraft's two wings and joined thruster propellers or turbines serve as rotary wings in helicopter mode and as fixed wings in airplane mode. The thrusters along the wingspans or at the wing tips drive both rotary wing rotation and airplane flight. Large-angle controlled feathering about the pitch change axes of the left and right wings and thrusters allows them to rotate, relative to each other, between facing and thrusting forward in the same direction for airplane flight or facing and thrusting oppositely for helicopter flight. Optional controls include: helicopter cyclic and collective pitch; airplane roll by differential wing pitch; yaw by differential prop thrust; fuselage pitch by wing pitch change and prop thrust change interacting with an underslung craft e.g.; and fuselage yaw control independent of rotor rotation via a powered rotary mast coupling or a tail responsive to rotor downwash. A teetering rotor hub is a further option.

A receptor medium with a sheet having an optically transmissive microembossed imaging surface as one major surface thereof. The receptor medium can receive jettable materials, which include inks, adhesives, biological fluids, chemical assay reagents, particulate dispersions, waxes, and combinations thereof. The microembossed medium unexpectedly solves such common inkjet printing problems as feathering, banding, and mudcracking in inkjet printing systems by controlling how an inkjet drop contacts and dries on an inkjet receptor medium and also Moire' effects but also provides sufficient optical transmissivity to be useful as overhead transparency media, backlit signage, and the like. Clear lines of demarcation between adjoining colors of a pigmented inkjet image graphic can be obtained without creation of the Moire' effects. Methods of making and using the inkjet receptor medium are also disclosed.

An ink which includes a first pigment, a second pigment, a polymer dispersant and an aqueous medium; wherein the first pigment is a self-dispersing pigment having on its surface at least one anionic group bonded to the surface directly or via an atomic group, the second pigment is dispersed in the aqueous medium by the polymer dispersant, and the polymer dispersant contains benzylmethacrylate as a monomer unit. Diffusion of this ink in the printing medium is suppressed in the cross-sectional direction but not horizontal direction. Thus, the ink can form an ink dot that has a proper dot size, uniform and high density in the dot, with little feathering or blur.

The invention discloses an all-digital testbed for an electric pitch control system of a wind generating set, which comprises a motor butting fixed platform, wherein a plurality of fixing positions for fixing a pitch control motor of the wind generating set are arranged on the motor butting fixed platform, a load assistant motor is detachably arranged on each fixing position and coaxially opposite to the pitch control motor, and the rotating shafts of the load assistant motors and the pitch control motor are connected together through couplers. The all-digital testbed further comprises a servo driver which connects and controls all the load assistant motors, a controller which controls the servo driver, and a host computer which contains a human-machine interaction interface and is provided for operators to input control commands. The all-digital testbed can effectively test the response condition of the electric pitch control system when the paddle load varies (i.e. when the wind speed is disturbed), and meanwhile, feathering, low voltage riding through and other functions of the standby power supplies of the pitch control system can be tested. The construction of the testbed provides an effective way for ground test research of the electric pitch control system.

The invention provides a multi-head ink jet printing method, a device, a device and a storage medium. The method obtains image data from a host computer and stores the image data in a first data storage module corresponding to a predetermined print channel structure in an FPGA. And then obtaining the feathering data generated according to the predetermined print channel structure from the host computer and storing the feathering data in the second data storage module of the FPGA; Further extracting the emergence data and the image data to a data processing module of an FPGA, and performing phase matching operation on the emergence data and the image data to obtain print data; The printing data is inputted into the corresponding printing channel for ink jet printing, and the feathering treatment is adopted, so that the mosaic error caused by manual installation of the nozzle diffuses with the feathering data, thereby eliminating the overlap existing in the printing image, ensuring thatthe printing image is not seriously distorted, and improving the quality and quality of the printing image.