229 results about "Wind shear" patented technology

The invention provides a side wind resistance landing flight track tracking control method based on side direction guide, which belongs to the flight track tracking control technology of airplanes landed under the side wind condition. The flight track tracking control method based on side direction guide is adopted, and comprises the following steps: calculating the inner ring posture control commands through a side direction guide law by the flight track tracking side direction deviation; generating steering engine control commands by an inner ring posture controller for controlling the airplane posture; and calculating the current side direction deviation by the flight line switching logics according to the current state of the airplane for the side direction guide law calculation. A transverse side direction movement model of the airplane is used for simulating the dynamic and kinematic model of the airplane. When being adopted, the side direction flight track control system based on the ground speed guide has better inhabitation effect on the side wind phenomena such as side direction gust wind, air turbulence, side direction wind shear and the like when the airplane is landed. At the same time, the side direction flight line switching logics can also meet the requirement of approach flight of the airplane under the side wind condition.

Embodiments of the present invention automatically compensate control of an aircraft for an environmental condition, such as turbulence or wind shear. A sensor is configured to sense speed of air relative to an aircraft at a predetermined distance in front of the aircraft. A processor is coupled to receive the sensed speed of air from the sensor. The processor includes a first component configured to determine whether the speed of the air at the predetermined distance is indicative of an environmental condition, such as turbulence or wind shear. A second component is configured to automatically generate control signals for controlling the aircraft such that the environmental condition is automatically compensated by a time the aircraft enters the environmental condition.

The invention discloses a blower fan load high-efficiency assessment system. The blower fan load high-efficiency assessment system includes a querying module of a load simulation database, wherein the querying module can query and manage simulation input data and load data of all types of research and development machines, such as a unit boundary condition, tower size, blade design data, a complete machine Bladed model, and load data of main parts, blades, and a tower; a load comparison and sensitivity analysis module which can perform comparison analysis on boundary conditions, main part loads, and blade and tower loads of different projects, and perform sensitivity analysis on loads of identical projects with different boundary conditions; and a unit load strength applicability assessment module which can interpolation-calculate a load corresponding to a specific site based on mass load simulation data change for boundary condition parameters such as the air density, the annual average wind speed, the turbulence intensity, wind shear, and the inflow angle, and can perform strength assessment on parts according to strength assessment margin of a reference project. The blower fan load high-efficiency assessment system can improve the calculation efficiency of a blower fan generator unit load, can shorten the life period, and can save cost.

The invention provides a distributed wind power plant fan optimized arrangement system and a method and belongs to the technical field of distributed wind power generation programs. The system comprises a data collection module, a topographic map data acquisition module, a digital signal processor (DSP) controller, a load flow calculation module, a maximum switched-in capacity analysis module, a fan optimized arrangement and calculation module and a graphic display module. The method comprises the steps of determining a region for a to-be-established distributed wind power plant, a location for the to-be-established distributed wind power plant to access to a power distribution network, the capacity of the to-be-established distributed wind power plant and the fan number of the to-be-established distributed wind power plant; establishing at least one anemometer tower in the region for the to-be-established distributed wind power plant, calculating the wind shear coefficient and the wind profile function of the anemometer tower to figure out the wake loss so as to obtain the actual wind speed and finally calculating the Weibull distribution function; establishing a constraint condition and an objective function for fan optimized arrangement; optimizing the positions of fans based on the taboo invasive weed algorithm to obtain a fan arrangement optimized solution; finely tuning the positions of fans, and displaying a final topographic map containing the region for the to-be-established distributed wind power plant equipped with fans.

A power generating system wherein a turbine (34) is mounted on top of a tower (30) or tethered underwater. The turbine (34) includes a rotor having a main blade (20) connected to a rotor hub (40) and an extender blade tip (22, 22′) attached to the main blade (20). During manufacture, the optimum energy-capture is determined using site-specific conditions of one or more of air density, wind speed, extreme wind, wind shear, noise and turbulence intensity. The extender blade tip (22, 22′) is chosen from a number of extender blade tips having a length that is the closest to the determined optimum energy-capture. The chosen extender blade tip is attached to the main blade either during manufacture or on-site. Alternatively, a one piece blade is produced based on information determined from the site specific conditions. The tip of such one piece blade can be customized based on the information obtained.

A low level wind shear velocity estimation method based on compressed sensing comprises the following steps: 1), utilizing Doppler vectors to establish a redundant dictionary so as to achieve sparse representation of an echo signal; 2), establishing a measurement matrix; 3), computing a measured value after the signal is compressed; 4), utilizing a regularization orthogonal matching pursuit algorithm to reconfigure a sparse signal; 5), utilizing a non-zero value in a complex amplitude estimation value to obtain Doppler frequency estimation of the radar echo signal; 6), computing a position of a maximum value in the complex amplitude estimation value after clutter rejection is performed, namely a velocity estimation result of a wind shear signal; and 7), repeating the step 3) to the step 6), judging whether the velocity estimation is accomplished according to the number of range units, and sequentially performing velocity estimation on echo data of all the range units within the scope. Aiming at the problem that velocity estimation precision is poor when the number of pulses is small and a signal to noise ratio (SNR) is low, the low level wind shear velocity estimation method based on the compressed sensing is provided. The low level wind shear velocity estimation method based on the compressed sensing can enable frequency spectrum resolution to be greatly improved while the accurate velocity estimation can be obtained, namely, the wind shear signal and the ground clutter signal can be well distinguished, wherein an interval between a frequency domain of the wind shear signal and a frequency domain of the ground clutter signal is very close.

A monitoring system for a wind turbine generator comprises: a wind speed obtaining unit for obtaining a wind speed; a wind condition identifying unit for identifying a wind condition parameter which includes at least one of a wind shear or an upflow angle of a wind which acts on a rotor of the wind turbine generator based on the wind speed obtained by the wind speed obtaining unit and at least one of a power output or a pitch angle of the wind turbine generator measured upon occurrence of the wind speed; and a fatigue load calculating unit for calculating a fatigue load of a component of the wind turbine generator based on at least the wind condition parameter identified by the wind condition identifying unit and a wind turbulence intensity of the wind which acts on the rotor.

The invention relates to an airborne meteorological radar ground clutter suppression method based on double threshold control. The airborne meteorological radar ground clutter suppression method comprises the following steps of: 1) reading inertial navigation parameters and a radio altitude value from an airborne navigation equipment; 2) compensating a clutter frequency spectrum center nearby a zero doppler frequency by utilizing prior information to obtain a clutter region and a spectrum width evaluation initial value; 3) calculating an echo power of each distance unit; 4) evaluating a clutter spectrum center and a spectrum width by utilizing a polar coordinate centroid method; 5) setting a control factor according to the echo powers; 6) calculating a spectrum width threshold and an amplitude control threshold by utilizing the control factor; 7) calculating the number of doppler channels (exceeding the thresholds) in the clutter region of each distance unit; and 8) utilizing the number of the ultralimit channels to design a self-adaptive notch filter, so that the aim that an airborne meteorological radar ground clutter can be realized. The airborne meteorological radar ground clutter suppression method is suitable for airborne meteorological radar ground clutter suppression in a wind shear mode and is simple; and with the adoption of the airborne meteorological radar ground clutter suppression method, the clutter suppression effect is good, and influences on target signal albefaction during the clutter suppression and influences of a residual clutter on a wind shear signal can be reduced.

The invention provides a crankshaft cleaning machine. The crankshaft cleaning machine comprises a rack as well as a first surface cleaning system, a surface ultrasonic cleaning system, a second surface cleaning system, an oil duct cleaning system, a surface rinsing system, a surface blow-drying system, a hot air drying system, an ultrasonic oil immersion system and a wind-shear oil blowing system which are arranged on the rack sequentially, a workpiece conveying system for conveying workpieces is further arranged on the rack and comprises a lifting and conveying mechanism and a tool adjusting mechanism. The crankshaft cleaning machine is designed for cleaning an automobile crankshaft and integrates advanced combined means such as ultrasonic waves, high-pressure spray, ultrahigh-pressure spray, rotation, flexible robot hole alignment, ultrasonic oil immersion, oil blowing and the like so as to be applied to crankshaft cleaning, drying and rustproofing processes, and the tool adjusting mechanism of the conveying system can adjust the width automatically to adapt to cleaning of products in various specifications.

An Airborne Windshear Detection System measures wind during the Take off and Landing phase by determining the Doppler Shift of backscattered radiation that is transmitted by an on-board laser system. The collected, scattered light is mixed with a sample from the transmitting Laser using a Dual Differential Mach-Zehnder Interferometer technique. The resulting frequency shift determines the presence of dangerous windshear in the anticipated trajectory of the aircraft.

The invention relates to a low-altitude wind shear wind speed estimating method based on a space-time optimal processor and belongs to the field of airborne meteorological radar signal processing. The low-altitude wind shear wind speed estimating method based on the space-time optimal processor comprises the following steps of 1) reading aeroplane state parameters, radar antenna scanning parameters and the like from associated airborne equipment as prior information; 2) selecting a distance unit to be detected, and correcting the distance dependence of ground clutter through a space-time interpolation method; 3) compensating aeroplane speed through the prior information; 4) estimating the ground clutter covariance matrix of the distance unit to be detected; 5) suppressing the ground clutter and performing wind speed estimation through the space-time optimal processor; 6) repeating the steps of 2)-5) and sequentially performing wind speed estimation on the echo data of all the distance units. The low-altitude wind shear wind speed estimating method based on the space-time optimal processor is used for solving the problem of poor wind speed estimation precision under the background of heavy clutter and imports space-time information into an airborne meteorological radar. Simulation results prove the effectiveness of the low-altitude wind shear wind speed estimating method based on the space-time optimal processor.

A wind turbine rotor load control. The pitch of the blades is controlled in a conventional manner by a command component, a rotor blade pitch command signal. A storage contains stored values of a set of moments for various wind speeds. A moment sensor provides a moment signal output. An instantaneous wind speed indicator provides an instantaneous wind speed value output. A conversion logic connected to the moment signal and to the instantaneous wind speed value, provides a calculated pitch modulation command. Combining logic connected to the calculated blade pitch modulation command and to the collective pitch command, provides a combined blade pitch command, which includes compensation for instantaneous moment deviations of the wind turbine.

The invention discloses a printed circuit board assembly (PCBA) on-line cleaning machine which comprises a machine body. A mesh belt for transmitting a PCBA board is arranged in the machine body, and a chemical pre-cleaning room, a chemical cleaning chamber, a chemical diaphragm chamber, a digitally integrated (DI) water pre-cleaning chamber, a DI water rinsing chamber, a spraying chamber, a wind shear drying chamber and a hot air drying chamber are arranged above the mesh belt and sequentially arranged along the operation direction of the mesh belt. The PCBA on-line cleaning machine drives the PCBA board through the mesh belt to sequentially perform chemical pre-cleaning, chemical cleaning, chemical isolation, DI water pre-rinsing, DI water rinsing, spraying, wind shear drying, hot air drying and the like from left to right, achieves full-automatic on-line cleaning of the PCBA board, enables the PCBA board to be comprehensively cleaned and rinsed and improves the cleaning and rinsing quality.

The present invention relates to a cleaning device and its use method, and aims to provide a workpiece cleaning machine and its use method to solve the problems in the prior art that the manual cleaning efficiency is low and some chemical substances in the cleaning process are easy to cause damage to the human body . The workpiece cleaning machine includes a frame; a conveyor belt on the frame; a spray system on the frame; an air cutting system on the frame. In the cutting system, the workpiece is first washed by the liquid spray head in the spray system, and then cleaned by the air spray head in the wind cutting system, and finally sent to the rear end of the conveyor belt. The batch cleaning of the workpieces is carried out in an assembly line, which improves the work efficiency, avoids direct contact between personnel and chemical substances such as cleaning fluids, and reduces the damage to the human body.

The invention relates to a detection method and system for low-altitude wind shear at an airport. The detection method comprises: S01, wind profile radar data of a boundary layer and wind sensor data of an airport runway are collected in real time to obtain wind field information; S02, wind shear information is extracted and outputted; and when the wind shear information exceeds a system threshold value, an early-warning signal inside a system is triggered; and S03, the early-warning signal is determined. Besides, the detection system is composed of a data acquisition module for collection data to obtain wind field information, wind shear data processing module for extracting wind shear feature information, and the wind shear early-warning data output module for determining and outputting an early-warning signal. According to the invention, the air field above the air port is detected in real time based on the wind profile radar data of the boundary layer and early warning of wind shear in a horizontal direction and a horizontal direction is carried out according to the obtained actual meteorological observation data, so that the identification and early-warning capabilities of the wind shear weather of the air port can be enhanced well. Therefore, the method and system have the broad application prospects.

An eddy carrier type wind power collection device includes a floating body and two air guiding tubes. The floating body including a compartment filled with an uprising gas having a density lower than that of air. The floating body includes a wind shear portion. The floating body further includes a floating assembly for controlling the pressure and temperature of the uprising gas. The air guiding tubes extend through the compartment of the floating body. Each air guiding tube has an air inlet and an air outlet. The air outlet includes a peripheral wall having a windward section and a guiding section. The peripheral wall of the air outlet has a cutout portion formed between the windward section and the guiding section. An air channel is formed between and in communication with the air inlet and the air outlet. A wind power generating assembly is mounted in each air channel.

The invention provides a method of controlling noise emission from a wind turbine comprising at least one rotor blade (1, 2, 3). The inventive method comprises steps of: Providing wind shear data comprising wind shear values as a function of height over ground; Determining an expected noise emission based on the wind shear data; and Controlling the wind turbine to reduce noise emission from the wind turbine in accordance with the expected noise emission.

Embodiments of the present invention automatically compensate control of an aircraft for an environmental condition, such as turbulence or wind shear. A sensor is configured to sense speed of air relative to an aircraft at a predetermined distance in front of the aircraft. A processor is coupled to receive the sensed speed of air from the sensor. The processor includes a first component configured to determine whether the speed of the air at the predetermined distance is indicative of an environmental condition, such as turbulence or wind shear. A second component is configured to automatically generate control signals for controlling the aircraft such that the environmental condition is automatically compensated by a time the aircraft enters the environmental condition.

In accordance with one embodiment, a uniform total body cryotherapy method and apparatus operative to allow an individual in a cryotherapy chamber to be subjected to the same cold temperatures on their entire body at the same time. In use, the apparatus allows active dissemination of cold air in a confined space without the undesired consequence of wind shear commonly caused by forced movement of cold air.

A control system for a wind turbine includes a detecting system configured to determine at least one of a rotor load, a wind shear, a wind speed, and a load imbalance due to wind shear. An adjusting system is configured to adjust a shaft moment set point correction value based on at least one of the rotor load, the wind shear, the wind speed, and the load imbalance. A compensating system is configured to compute a shaft moment correction command based on the shaft moment set point correction value output from the adjusting system. A pitch system is configured to adjust a pitch of at least one blade of the wind turbine based on the shaft moment set point correction command, or a yaw system is configured to adjust the yaw position of a rotor based on the shaft moment set point correction command.

The invention relates to an emulation method of high fidelity onboard foresight weather radar low-altitude wind shear signals, which belongs to the technical field of emulation of radar echo signals and comprises the following steps of: (1) establishing a wind shear wind field model by using wind field emulation software; (2) computing reflectivity factors of wind shear wind fields according to density information of an emulation wind field; (3) initializing an emulation scene; (4) determining opposite position information of scattering particulates in the scanning orientation and an airplane; (5) computing the amplitude and the phase position information of echo signals of the scattering particulates of the wind field; (6) superposing echoes of the scattering particulates to form an echo signal in the scanning orientation; and (7) updating a scanning angles of an antenna, and judging scanning range, if the scanning range is exceeded, outputting emulation results, and otherwise, repeating the steps. The invention has the advantages of simple method, good emulation effect, echo emulation of onboard foresight weather radar wind shear targets at high fidelity, and the like.

The invention discloses a low-altitude wind shear three-dimensional backscattering wave simulation method for an airborne meteorological radar. The low-altitude wind shear three-dimensional backscattering wave simulation method comprises the following steps: establishing a three-dimensional meshed computational domain by utilizing scene parameters including a scene range and boundary conditions; performing fluid simulation on the computational domain to generate original wind field data; correcting the original wind field data; establishing an simulation scene and reading the corrected wind field data according to settings of the scene parameters; according to the simulation scene, simulating low-altitude wind shear of the airborne meteorological radar, and performing coherence stack on scattering points within a radar beam to form a radar backscattering wave signal of a scanning direction; respectively updating airplane position information, corrected wind field data and radar beam angle scanning information by utilizing the airborne parameters, the scene parameters and the scanning parameters; judging whether the scanning is completed or not according to a scanning range of the radar parameters. The method can be used for truly reflecting meteorological characteristics of the wind shear three-dimensional backscattering wave signal, so that the simulation data is effective and reliable.

The invention provides a novel stretching rotary manipulator. The novel stretching rotary manipulator comprises a stretching mechanism component, a rotary mechanism component and a clamping jaw mechanism component, wherein the stretching mechanism component comprises a linear guide rail, hinges and a hinge driving cylinder, and the junctions of cross joints of the hinges are connected with the linear guide rail through connection blocks; the rotary mechanism component comprises a plurality of rotary seats and rotary seat driving cylinders, and the rotary seats are fixed on the connection blocks through rotating shafts; and the clamping jaw mechanism component comprises a plurality of independent clamping jaw units. By adoption of the design, a plurality of batteries can be grabbed at a time, directional rotation of the plurality of batteries can be finished at a time, and the distance between every two batteries is increased, so that remarkable shortening of loading and unloading time for cleaning of the batteries is facilitated, and the production efficiency is improved. Water drops on the surfaces of the batteries can be blown off when the batteries are subject to upper-order wind shearing; the distances between the batteries are increased in the way that the cylinder drives the hinges, so that the intervals between the batteries can be the same; and the clamping jaw driving cylinders are adjustable in position to adapt to loading and unloading of the batteries with different widths.

A wind turbine blade instrumentation structure and method is provided for fluid dynamic polymer-based contact sensors measuring ambient pressure based on the resistivity changes across the sensor. The pressure sensors may applied in predetermined patterns to airfoil structures, such as wind turbine blades, without impacting the blade structure and fluid dynamic characteristics. The pressure sensors measure blade performance with high fidelity. The pressure measurements are transmitted to processing to determine blade characteristics and environment including flow separation, stagnation point, angle of attack, lift and drag and wind speed. Further processing of the pressure distribution may identify wind shear, up-flow and yaw error.

The invention provides a three-dimensional wake numerical simulation method based on a 2D_k Jensen model, which can obtain a novel three-dimensional wake model. The method is characterized in that: step 1, calculating an inflow wind shear curve u0 (z) and the turbulence intensity distribution I0 (z) in the vertical direction; 2, calculating that expansion coefficients kx, z of the wake; 3, predicting that wake wind speed based on the original Jensen model to obtain the initial wake wind speed u* (x, z); 4, calculating that expansion radius rx, r of the wake; 5, utilizing that wake expansion radius rx, r obtained in the step 4, based on the cosine-type velocity distribution proposed by the 2D_kJensen model, three-dimensionally modifying the initial wake wind speed u* (x, z) obtained in thestep 3 to obtain the corrected wake wind speed distribution u (x, y, z). The three-dimensional wake model obtained by the invention inherits the advantages of the engineering model, and has good prediction accuracy for the wake velocity deficit in the direction of flow direction, the cross wind direction and the vertical direction, and can effectively reflect the asymmetric characteristics of thevelocity deficit in the vertical direction, and the calculation accuracy is even better than the numerical simulation result based on the CFD method.

The invention relates to a combined space-time main channel adaptive processing-based low-altitude wind shear wind speed estimation method. The method includes the following steps that: aircraft and radar parameters are read; the parameters are used to perform phase compensation on radar echo signals; distance-dependent correction is performed on echo signals obtained after phase compensation is performed on the distance units of a radar, and the clutter covariance matrix of a distance unit to be measured is estimated; a dimensionality reduction joint space-time transformation matrix is constructed so as to perform dimensionality reduction adaptive processing on the radar echo signals; the dimensionality reduction joint space-time transformation matrix and the clutter covariance matrix areadopted to solve the optimal weight vector of a combined space-time main channel adaptive dimensionality reduction processor; and the optimal weight vector is utilized to construct a cost function, and the maximum value of the cost function is searched, so that the wind speed of the unit to be measured can be estimated. In order to solve the problems of the reduction of clutter suppression performance and the inaccuracy of low-altitude wind shear wind speed estimation under a condition that an airborne weather radar is affected by amplitude and phase error, the combined space-time main channel adaptive processor is applied to the low-altitude wind shear wind speed estimation, so that ground clutter suppression and wind speed estimation can be effectively achieved.

The invention discloses a low altitude wind shear wind speed estimation method based on space-time amplitude and phase estimation. The method includes the following steps that (1) flight parameters and radar parameters are read from related airborne equipment to be used as apriori information; (2) distance units to be detected are selected, a clutter spectrum registration method is used for processing received data, and accordingly a plurality of independent identically-distributed samples are obtained; (3) the airplane speed is compensated through the apriori information; (4) a space-time APES filter is constructed, ground clutter is restrained in a self-adaptive mode, and the wind speed is estimated; (5) the steps from (2) to (4) are executed again, echo data of all the distance units within the radar working range are processed sequentially, and wind speed curves changed along with the distances are obtained through estimation. By the adoption of the method, the ground clutter can be effectively restrained under the high clutter condition, and the wind field speed can be estimated accurately.

The present invention discloses an electric fan module and an airflow conduction structure thereof, wherein the airflow conduction structure is coupled to an electric fan and guides the central airflow to fan blades to reduce wind resistance and wind shear. The airflow conduction structure has an airflow conduction body and at least one airflow conduction groove arranged axially on the airflow conduction body. The airflow conduction body has a first end face and a second end face, and the first end face is greater than the second end face. The airflow conduction grooves are arranged between the first and second end faces.

The invention relates to a method for detecting dust retention. The method comprises the following steps: 1, starting a fan to enable the fan to rotate at a preset rotating speed to generate airflow to pass through a condenser, and simultaneously transmitting the preset rotating speed value to a controller; 2, detecting an actual rotating speed of the fan and transmitting the actual rotating speed value to the controller; 3, calculating the difference between the actual rotating value and the preset rotating speed value, taking an absolute value of the difference, and judging whether the absolute value is larger than a set value, and if so, sending a dust retention amount alarm signal. The invention also discloses a system for detecting dust retention. The invention also discloses an air conditioner adopting the method for detecting the dust retention. The method and the method disclosed by the invention have the beneficial effects that the method is better in universal performance and accuracy. The increase of extra assemblies cannot be caused, the heat dissipation performance of the condenser can be improved, and the wind shear noise caused by increase of the rotating speed is avoided.

The wind force power generator includes one vertical tubular body with upwards reduced inner diameter, at least one air inlet in the great diameter part in the bottom and one air outlet in the small diameter part in the top to produce wind shear effect of the outer air; and one electricity generator set on the air outlet side and with one blade aligned to the air outlet. By means of the wind shear effect at the outlet, the Bernoulli's negative pressure effect of the blade connected to the electricity generator to suck air in the outlet, and the Venturi speeding effect of the tubular body to speed the air flow to the outlet, the blade is blown and the electricity generator is driven to generate electricity.