33 results about "Stability result" patented technology

The invention discloses a device and a method for detecting the heat radiation performance stability of an automobile air conditioner heat exchanger. A constant-temperature water tank is connected with a water inlet of a high-temperature-resistance safe water pump through a water quantity regulation valve and is simultaneously connected with the outlet end of the heat exchanger, a water outlet of the water pump is connected with the inlet end of the heat exchanger through a flow rate meter, and a plurality of temperature sensors are placed around the heat exchanger and are connected with a data processing center after being connected with a data collecting system. A fan is placed right in front of the windward side of the heat exchanger. The constant-temperature water tank provides constant hot water, the water pump boosts the pressure of hot water, the temperature sensors test the temperature of the water and the air after and before passing through the heat exchanger, the flow rate meter measures the flow rate of the water while passing through the heat exchanger, the fan simulates the actual work state, the data collecting system converts signals collected by the temperature sensors and the flow rate meter into data, and the data processing center analyzes the collected data and obtains the heat transfer factor and the heat radiation performance stability results of the heat exchanger. The device and the method can be used for detecting the heat radiation performance stability of the automobile air conditioner heat exchanger, and the detection is reliable.

A feature extraction and clustering analysis method for a transient stability result of a power system comprises the following steps: 1) carrying out normalized preprocessing on transient stability feature data to cluster the data; 2) performing feature extraction and abnormal point judgment on the preprocessed data by using an improved clustering algorithm; 3) carrying out effectiveness evaluation on the clustering effect; And 4) analyzing the data features extracted from the transient stability in combination with geographic position information. The objective of the invention is to solve the technical problems of low normalization degree, untight connection between different parameters and slow network convergence in the existing method for extracting and clustering the transient stability result characteristics of the power system. System data features can be effectively and accurately extracted, and help is provided for electric power system planners to identify system responses.

The invention discloses an overall evaluation method for a normal-pressure storage tank containing a defect. The method is characterized by including the following steps: measuring a property, a sizeand a position of the defect on the storage tank; establishing a storage tank model of the defect in Ansys software according to a storage tank structure and the defect position, size and property; using the Ansys software for loading actual loads to calculate storage tank structure strength and a storage tank stress strength factor, and loading unit loads for stability calculation; and evaluatingcalculated and obtained storage tank structure strength, the storage tank stress strength factor and a stability result to comprehensively evaluate safety status of the storage tank. According to themethod, deficiencies and shortcomings on the aspect of current domestic storage tank safety evaluation standards are solved, the safety status of the storage tank is evaluated from multiple angles ofstructural mechanics, fracture mechanics and the like through a method of combining non-destructive earlier-stage detection and calculation of the finite-element software Ansys, and a calculation result has higher reliability.

A binder for a battery electrode comprising a vinyl fluoride-based copolymer. The vinyl fluoride-based copolymer preferably comprises about 25 to about 85 mol % vinyl fluoride and about 75 to about 15 mol % of at least one other fluorine-containing monomer. In a preferred embodiment, the binder comprises a mixture of at least two types of vinyl fluoride-based copolymers. In another embodiment the binder comprises a vinyl fluoride-based copolymer and at least one other fluorine-based polymer. The binder can be dispersed in water or organic solvent to form a paste for binding electrode materials to current collectors for battery electrode fabrication. Battery electrodes with improved adhesion strength and electrochemical stability result.

A binder for a battery electrode comprising a vinyl fluoride-based copolymer. The vinyl fluoride-based copolymer preferably comprises about 25 to about 85 mol% vinyl fluoride and about 75 to about 15 mol% of at least one other fluorine-containing monomer. In a preferred embodiment, the binder comprises a mixture of at least two types of vinyl fluoride-based copolymers. In another embodiment the binder comprises a vinyl fluoride-based copolymer and at least one other fluorine-based polymer. The binder can be dispersed in water or organic solvent to form a paste for binding electrode materials to current collectors for battery electrode fabrication. Battery electrodes with improved adhesion strength and electrochemical stability result.

The invention discloses a dissolved oxygen measurement method and application based on the principle of fluorescence quenching, which belongs to the technical field of dissolved oxygen measurement in water bodies, and comprises the following steps: (1) measuring the phase of the excitation light and the phase of the reference light to obtain the phase difference ( 2) Use the calculation obtained in step (1) to obtain the partial pressure of oxygen Δp; (3) use the obtained Δp to calculate the oxygen saturation S; (4) use the oxygen saturation S obtained in step (3) to calculate the dissolved oxygen Concentration [O2], the dissolved oxygen concentration calculated by the method of the present invention has high accuracy and good stability of the result.

The invention discloses an aircraft holder stability testing device and an aircraft holder stability testing method based on a digital camera. A fixed bracket is arranged on the periphery of an aircraft, the top part of the aircraft is fixed to the lower end of a supporting rod through a universal joint and is positioned at the center of the fixed bracket, an oilcloth is horizontally arranged at the bottom surface of a frame of the fixed bracket, a logo image is arranged on the oilcloth, the digital camera is in rigid connection with a body of the aircraft, and the aircraft and the digital camera are connected with a PC upper computer on the ground through a picture data transmission system; and the digital camera is calibrated firstly, a relation between a pixel position of an image of the digital camera and a logo point position on the oilcloth is established, the fixed bracket and the oilcloth are kept in parallel to the ground horizontally in flight, exterior orientation parameters are obtained through processing picture data acquired in real time, and the stability result of an aircraft holder is obtained through variance calculation. The aircraft holder stability testing device adopts the scientific and effective aircraft holder stability testing method for detection stability of the aircraft holder, is simple and reasonable in structure, high in universality and convenient to disassemble, and can be suitable for various kinds of aircraft holders.

The invention discloses a motor servo system error symbol integral robust adaptive control method comprising the following steps of establishing a motor position servo system model; designing an error symbol integral robust adaptive controller; based on the error symbol integral robust adaptive controller, conducting stability proving of the stability of the motor servo system through utilization of the Lyapunov stability theory; and using the Barbalat lemma to obtain the global asymptotic stability result of the system. According to the invention, an error symbol integral robust adaptive anti-interference controller based on parameter self-adaptation is proposed for the parameter uncertainty and unknown non-linear factors in a motor servo system. The parameter adaptive rate can effectively estimate unknown parameters in the system, and error symbol integral robust terms are adopted to overcome other uncertain nonlinear factors in the system, thereby ensuring the control precision in the motor servo system.

The invention discloses a high-stability dye transferring device which comprises a dye transferring device body. A motor is arranged on the back face of the inner wall of a bottom box which is fixedlyconnected to the bottom of the dye transferring device body, and a moving rod is fixedly connected to the top of the front face of a rotating plate which is fixedly connected to an output end of themotor. By joint use of a motor, the rotating plate, the moving rod, a connection block, a moving plate, a transmission groove, a transmission column, a transmission frame, a slide rod, slide grooves,a transmission rod, a transverse plate and moving grooves, the problem of poor stability resulted from proneness to moving or shaking in use of the dye transferring device due to failure in roller storage is solved, the high-stability dye transferring device has advantages of realization of roller storage and high stability, proneness to moving or shaking in use of the dye transferring device is prevented, pedestrians or users can be protected from injuries, and practicality of the dye transferring device is improved.

The present invention provides a gender recognition method and device based on human face images, wherein the gender recognition method based on human face images includes: obtaining gender recognition results of consecutive N frames of human face images, and the gender recognition results are used to represent the identity of the observed person Gender attribute, N is a natural number greater than 1 and less than the preset number of frames; judge whether the gender recognition results of consecutive N frames of human face images are consistent; when the gender recognition results of the continuous N frames of human face images are consistent, the The gender attribute of the observer is determined as the gender attribute represented by the gender recognition result. In this way, the selected number of image frames is smaller than the number of image frames selected by the average method when obtaining consecutive N frames of human face images with consistent gender recognition results, so as to improve the recognition rate. And the stable result can be expressed by the power of the recognition accuracy of a single frame face image under the number of selected image frames, so when the number of selected image frames is small, a higher stable result can be obtained, that is, a relatively stable gender recognition result.

The invention discloses a throttling valve, which comprises a valve body, a valve core and a driving part installed on the valve body. An accommodation cavity and a first passage and a second passage connecting the accommodation chamber and the outside world are opened in the valve body. The valve core can It is rotatably installed in the accommodating cavity; the valve core is driven by the driving member to rotate on its own, so that the first passage is connected with the second passage or shut off. The invention also discloses an air conditioner with the throttle valve. The throttling valve provided by the invention has the effects of not being easily stuck by impurities and having better stability.