374 results about "Icing conditions" patented technology

A method for detecting ice on a wind turbine having a rotor and one or more rotor blades each having blade roots includes monitoring meteorological conditions relating to icing conditions and monitoring one or more physical characteristics of the wind turbine in operation that vary in accordance with at least one of the mass of the one or more rotor blades or a mass imbalance between the rotor blades. The method also includes using the one or more monitored physical characteristics to determine whether a blade mass anomaly exists, determining whether the monitored meteorological conditions are consistent with blade icing; and signaling an icing-related blade mass anomaly when a blade mass anomaly is determined to exist and the monitored meteorological conditions are determined to be consistent with icing.

Methods for controlling an aircraft turbofan engine during icing of a temperature probe and devices for carrying out such methods are described. The methods may comprise: using one or more signals representative of temperature received from a heated temperature probe to generate one or more control signals for use in controlling the engine; determining that an icing condition associated with the probe exists; and using data representing one or more substitute signals in place of signals representative of temperature received from the heated temperature probe to generate the one or more control signals for use in controlling the engine.

An apparatus for detecting icing conditions on an aircraft includes a laser system configured to direct a light signal into a cloud, a lens component configured to collect echo signals from a cloud caused by the light signal directed into the cloud, a beam splitter component configured to redirect signals received and passing through the lens component into at least first and second paths and a supercooled large droplet (SLD) detector to receive the redirected signals. The SLD includes a first signal detector component configured to perform a first color measurement on the first redirected signal, and a second signal detector component configured to perform a second color measurement on the second redirected signal. The SLD detector is configured to use the first and second color measurements to determine liquid water content and droplet diameter distribution for the cloud.

A detecting device for detecting icing by an image includes an image acquiring system (1-A) and an image processing system (2-A). The image acquiring system (1-A) can acquire an image of an object's surface. The image processing system (2-A) can analyze the image and obtain an icing condition of the object's surface. The detecting device is simple and reliable. It can identify the category of the icing effectively. So, it can improve the accurateness of the icing detection significantly and can accomplish the detection of the object's whole surface. Furthermore, it can detect an icing condition of a super-cooled large droplet. A method for detecting an icing condition of an object's surface using the detecting device is also provided.

An apparatus for determining air temperature such as an air temperature sensor suitable for use on an aircraft, such as on an aircraft engine, and where the air temperature sensor may be exposed to adverse conditions including high Mach numbers and icing conditions as well as water and debris and be capable of providing accurate temperature readings.

The invention discloses an icing detection method and device for an air conditioner indoor unit, and belongs to the technical field of air conditioners. The icing detection method comprises the stepsthat the outdoor environment temperature and the suction temperature of a compressor when an air conditioner operates in a refrigeration mode or a dehumidification mode are acquired; and when the outdoor environment temperature and the suction temperature meet preset icing judgment conditions, the air conditioner is triggered to enter an icing protection mode, wherein the icing conditions refer tothat the outdoor environment temperature is higher than or equal to a first outdoor temperature threshold value and the suction temperature is smaller than or equal to a first suction temperature threshold value. According to the icing detection method for the air conditioner indoor unit, whether or not the indoor unit has the icing tendency can be judged according to outdoor unit relevant parameters such as the outdoor environment temperature and the suction temperature of the compressor, and corresponding protection is triggered in time, so that the problem of detection failures caused whenan indoor unit coil is affected by the factors such as refrigerant deficiency or indoor distribution variations is avoided, and the phenomenon that the air conditioner indoor unit is damaged due to icing is avoided.

The invention provides an intelligent circulation anti-icing method which can be applied to two to twelve and more split lead power transmission lines to transmit current. The method can be applied to any icing tension line section of a power transmission line and can accurately judge whether the icing prevention needs to be started or not automatically according to the line icing condition to realize the automation and the intellectualization of the whole anti-icing process. The method comprises the following steps of: mounting a control device; detecting the environmental parameter and judging whether the current environment needs to start the icing prevention or not by the control device; grouping sub-leads of the split lead; and when the anti-icing operation needs to be started, sequentially converging currents of all split leads at the transmitting end of the anti-icing section on each group of sub-leads according to preset interval time by the control device. The invention increases the transmission current of the sub-leads, achieves the aim of icing prevention by joule heat and can realize the automation and the intellectualization of the local or whole anti-icing process without adding an ice thawing power supply and the icing detection on the line and damage the icing condition before the generation of ice.

The invention discloses a power transmission line icing detecting and early-warning device. Filtering and edge detection are performed on image information transmitted through a network and acquired by a camera, coordinates of boundary contour points in an image are recorded through binarization processing and boundary tracking, finally, coordinates of boundary points before and behind a power transmission line are compared comprehensively, and the icing thickness of the power transmission line at the moment is obtained through calibration by the aid of the diameter of the power transmission line; data analysis is performed according to micro-meteorological parameters acquired by a data acquisition module, under the assistance of a lead tension change trend diagram and an icing thickness change trend diagram in a set time period, in combination with stored historical icing thicknesses, icing conditions and icing thicknesses in the next three to five days are predicted according to meteorological parameter conditions under which icing is formed easily, the line designed icing thickness and the actually measured icing thickness, and early-warning signals are sent out. With the adoption of the device, online detection is performed on icing of the power transmission line, meanwhile, dynamic early-warning can be realized, and analysis and early-warning can be performed on icing information timely.

A windfarm including a plurality of wind turbines, an ice detection sensor adapted to detect an icing condition of at least one of said plurality of wind turbines, and a main controller connected to said ice detection sensor and to at least two of said wind turbines, wherein the main controller is adapted to control the operation of said at least two wind turbines based on an icing condition detected by said ice detection sensor. A method for controlling the wind farm is also disclosed.

The invention discloses a computing method of model parameters in an icing wind tunnel experiment under a supercooled large droplet condition and aims at solving the problems that an existing parameter selecting method for a supercooled small droplet icing experiment does not function well if being applied to a supercooled large droplet icing experiment and that the real icing condition cannot be reflected by icing on a scale model of the airplane. The computing method of the model parameters in the icing wind tunnel experiment under the supercooled large droplet condition is capable of orderly giving the experimental parameters of a wind tunnel test section such as air velocity, average droplet grain diameter, air pressure, liquid water content, icing time and low supercooled water temperature corresponding to real icing flying conditions by use of a theoretical derivation and numerical computation method after determining the scale relation of the model and the real airplane. An aircraft icing wind tunnel experiment is performed according to the converted test parameters, and the experimental result and the real result are capable of meeting the similarity requirement on the major characteristics of the icing process. As a result, the computing method of the model parameters in the icing wind tunnel experiment under the supercooled large droplet condition is capable of obtaining the model parameters for the icing wind tunnel experiment; the corresponding parameters are capable of reflecting the real icing condition in the icing wind tunnel experiment.

The invention provides a method and system for monitoring an icing condition of an overhead power transmission line. The method comprises the following steps of: collecting current information of a power transmission line in real time; establishing a Makkonen model according to the collected current information and carrying out data analysis processing to obtain icing condition data of the power transmission line; and making an alert to the data exceeding a warning value. In the technical scheme, the Makkonen model is established through collecting all state information of the power transmission line and is used for carrying out real-time protection and monitoring on an icing load, an icing thickness, a tower rod stress and a lead stress of the power transmission line; and once a monitoring value exceeds an early-warning value, an alert is given out to show that the power transmission line has an icing fault and the power transmission line needs to be monitored and repaired. By utilizing the technical scheme provided by the invention, the automatic monitoring of the icing condition of the power transmission line is realized; and meanwhile, compared with the traditional manual patrol and monitoring, the method and device provided by the invention have the advantages that the accuracy of the line icing monitoring is effectively improved and the labor intensity is effectively reduced.

The invention discloses a blade deicing system of a wind generating set. The blade deicing system comprises an image detection element (1), a control element (2) and an deicing element (3); the image detection element (1) is used for detecting the icing condition of a blade (4) of the wind generating set in real time and converting the icing condition into an image signal; the control element (2) is used for receiving the image signal and controlling the action of the deicing element (3) according to the image signal and a predetermined image signal; and the deicing element (3) is used for clearing an ice layer on the blade (4) under the control of the control element (2). High precision degree of the image signal ensures timely discovery of the icing problem; and the data of the icing condition can be directly acquired from the image signal, so the error is small and the timely discovery of the icing problem is further ensured.

A method for ice detection for a wind turbine is provided. The method includes providing an ice condition threshold parameter adapted for distinguishing a condition during which icing may occur and a condition during which icing may not occur, measuring a wind velocity with a first anemometer, wherein the first anemometer being of a first type, measuring a wind velocity with a second anemometer, wherein the second anemometer being of a second type, and wherein the second type is different from the first type, evaluating, for a condition during which icing may occur, a deviation of the wind velocity measured with the first anemometer and the wind velocity measured with the second anemometer, and determine whether the deviation exceeds a limit value based on a calibration conducted under a condition during which icing may not occur.

An anti-icing composition including a chemically-bound nano-layer based on a multivalent atom such as silicon or titanium, and whiskers of hydroxyls, polyols, polyethers, polyamines, poly-acids or mixtures of such hydrophilic functionalities. This base layer may be used as such or have an additional coating overlying it, e.g., comprising a polymeric polyol such as polyvinylalcohol or polyglycol. The second layer may also be chemically bonded to the surface or to the first layer. Surface treatment with such composition prevents small droplets of water from freezing on the surface and reduces dramatically their friction with the surface. The result is the prevention of icing of the surface, reduction in the adhesion of ice to the surface and reduction in the accumulation of ice layers. The anti-icing composition also makes removal of ice from the surface much easier once accumulated, and is useful in reducing de-icing requirements of aircraft and in retarding in-flight ice formation. Other applications include coating window panels and vehicles exposed to icing conditions and preventing bulk particles from adhering to each other in icy conditions.

In a first aspect the invention relates to a sensor system (10) for determining a proximity to icing conditions of an environment. The system includes a sensor having a sensor surface (12) for exposure to the environment, an electrically powered heat pump means (16) for cooling and/or heating the surface (12), and a temperature detector (14) for providing a signal representative of the temperature of the surface (12). An environment temperature is determined, and a processor determines, from the temperature detected by the temperature detector (14) and the environment temperature, a proximity to icing conditions of the environment to which the surface (12) is exposed. In a second aspect of the invention the sensor system includes a power monitor for determining an amount of power required to heat or cool the surface through a temperature indicative of ice formation. The processor determines the proximity to icing conditions from the detected temperatures and the amount of cooling or heating power.

An aircraft wing (12) comprising a structural member (20) forming the wing's leading edge skin, a Kreuger flap (16) which moves relative to the structural member (20) between a stowed position and a deployed position, and an electrothermal device (34) mounted (e.g., internally mounted) to the structural member (20). An aft portion (30) of the structural member (20) is curved inwardly to form a recess (32), and a fore portion (18) of the flap (16) fits within the notch (32) to form a joggle therebetween. The electrothermal device (34) is a deicing and/or anti-icing device which continuously provides heat to the curved aft portion (30) of the structural member (20) during icing conditions so as to prevent deployment-inhibiting ice buildup on the flap (16).

The invention discloses a method for predicting icing meteorological parameters MVD based on a BP neural network. According to the relationship among the liquid water content LWC listed in the appendix C of the airworthiness standard [CCAR-25-R4] of Chinese transportation aircrafts, the average effective water drop diameter MVD and the ambient air temperature T, icing conditions under different flight conditions are calculated, and an icing thickness database with the ice thickness changing along with time is established; a BP neural network model is trained by using an icing thickness database, and icing meteorological parameters MVD are predicted by taking flight conditions (flight attack angle and flight speed) and temperature provided in real time and a mapping relationship between icing thickness and icing time as input. The method for predicting the MVD by combining the real-time flight parameters and the icing thickness based on the BP neural network is high in precision, smallin error, short in response time, capable of realizing real-time measurement, capable of providing effective and reliable technical support for icing airworthiness certification and considerable in application prospect.

The invention discloses an image icing detector, which comprises an image acquiring system (1-A) and an image processing system (2-A), wherein the image acquiring system (1-A) can be used for acquiring an image of an object surface; the image processing system (2-A) can be used for analyzing the image so as to acquire the icing condition of the object surface; and the image acquiring system (1-A) comprises an image transmitting optical fiber bundle (104). By the detector, application requirements under a special spatial requirement can be met without the miniaturization design of the image acquiring system (1-A).

The invention discloses an automatic spiral elevating active ice-resisting device, comprising a fixed support which is arranged around and fixed with the outside of a leg of a protected object, a hydraulic self-elevating system fixed with the fixed support, a cylinder-type movable support which is fixed with a plunger of the hydraulic self-elevating system and is arranged around the outside of the leg of the protected object, and an ice-resisting cone which is arranged around and connected with the outside of the cylinder-type movable support. The ice-resisting cone is a combined body of a positive cone and an inverted cone; the inner surface of the combined of the positive cone and the inverted cone is in threaded connection with the outer surface of the cylinder-type part of the cylinder-type movable support; a propeller is arranged on the lower end face of the combined of the positive cone and the inverted cone. The device can automatically adapt to tidal range changes, can realize the functions of breaking ice actively, operating fully automatically, reducing the threat to a platform from the accumulation and climbing phenomena of ice sheets, is especially suitable for the sea areas under serious ice conditions, and can effectively protect ocean engineering structures in iced sea areas.

The embodiments of the invention provide a blade icing model building method and an icing condition monitoring method and device. The method comprises the steps: acquiring a variety of sample data reflecting an icing condition, and generating a correlation coefficient matrix for all the sample data according to the sample data; carrying out factor analysis on the correlation coefficient matrix so as to obtain a factor loading matrix, which aims at contribution of a plurality of preset common factors, of each sample datum, wherein each factor loading matrix serves as a blade icing model of a wind generating set, and each common factor is a icing type. By adopting the embodiments of the invention, the accuracy of monitoring icing conditions of blades of the wind generating set can be improved.