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480results about How to "Applicable" patented technology

Temperature rise analytical method for predicting temperature of permanent magnet in permanent magnet synchronous motor

InactiveCN101769797AAccurate predictionAvoid difficulties such as air gap temperature measurementThermometerDynamo-electric machine testingModel selectionPermanent magnet synchronous motor
The invention relates to a temperature rise analytical method for predicting temperature of a permanent magnet in a permanent magnet synchronous motor (PMSM), belonging to the application electrical engineering design field; the method is characterized in that: distributed heat source of a motor is analyzed by a filed-circuit compact coupling method, comprising eddy current loss in the permanent magnet, iron loss in an iron core and copper loss in armature; on the consideration of precision requirements, the coupling analysis of a magnetic field and a temperature filed can be realized by single-way coupling mode. A thermal model of the permanent magnet synchronous motor is built based on a mixing method of a novel equivalent heat network and a finite element, heat parameters are rationally selected by adopting a combining mode of experimental measurement and empirical formula, the heat transferring coefficient and cooling condition of the motor are described completely, a stator and a rotor can be systematically combined by adopting air gap joints in the heat network, the stator and rotor unified temperature rise model is formed, the difficulty of measuring air gap temperature is avoided, material parameters are adopted at the practical working temperature, so as to lead the analysis to be rational; the accurate and optical method for predicting the temperature of the permanent magnet is realized by special correction processing in experimental links; in addition, the design method is used to give suggestions for model selection of the permanent magnet material in the motor.
Owner:李虎

A comprehensive assessment method for the operation effect of a power grid side energy storage power station

The invention discloses a comprehensive assessment method for the operation effect of a power grid side energy storage power station, and the method comprises the steps: constructing an energy storagepower station operation effect assessment index system, and determining a to-be-assessed scheme set; According to the actual operation data of each power station, calculating and extracting evaluation indexes of all schemes in the scheme set to be evaluated of each power station to form an initial decision matrix, and performing standardized processing to obtain a normalized decision matrix; Adopting an analytic hierarchy process to obtain a subjective weight vector of the evaluation index, adopting an entropy weight method to determine an objective weight vector of the evaluation index, andobtaining a comprehensive weight vector of the evaluation index through a game theory combination weighting method; And comprehensively evaluating the operation effect of each power station. The constructed index system has scientificity, applicability and operability, the selected indexes are high in applicability, and calculation is easy; The actual operation effect of the power grid side energystorage power station is comprehensively evaluated from many aspects, and a basis is provided for planning construction, scheduling operation control and the like of a subsequent energy storage project.
Owner:STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +3

Login method, login system and cloud server

InactiveCN103152330AReduce or even completely eliminate input costsImprove experienceTransmissionComputer scienceLogin session
The invention provides a login method, a login system and a cloud server. The login method comprises the following steps that the cloud server receives a session request which is transmitted by a first terminal aiming at a preset address; the cloud server obtains first login session information between the cloud server and the first terminal; the cloud server generates a login two-dimensional code according to the first login session information and transmits the login two-dimensional code to the first terminal to display the two-dimensional code through the first terminal; the cloud server receives a login request which is transmitted by a second terminal after the second terminal resolves the login two-dimensional code, wherein the login request contains the first login session information; and the cloud server generates second login session information between the cloud server and the second terminal according to the first login session information, and transmits the second login session information to the second terminal. According to the method provided by the embodiment of the invention, the input cost in the user login process is reduced or even fully eliminated, the user experience is improved, and the rapidness, the security and the applicability are good.
Owner:BAIDU ONLINE NETWORK TECH (BEIJIBG) CO LTD

TFT LCD mura defect detection method based on hybrid self-adaptive level set model and multi-channel fusion

The invention discloses a TFT LCD mura defect detection method based on a hybrid self-adaptive level set model and multi-channel fusion, and belongs to the technical field of LCD mura defect machine vision detection technologies. The invention discloses a mura detection method based on a hybrid self-adaptive model with global information and local information fusion. The hybrid self-adaptive model can increase the curve evolution speed and effectively overcome the interference caused by non-uniformity of the background gray scale; furthermore, the hybrid self-adaptive model can be self-adaptively decreased when getting close to a target region so as to prevent over convergence and realize accurate partitioning of a weak edge. Meanwhile, the invention discloses a detection scheme based on multi-channel fusion of gray-scale maps and s channel images so as to be compatible with detection for different types of mura. According to the TFT LCD mura defect detection method, an ROI region can be accurately extracted, and a texture background of the ROI region is suppressed; the self-adaptive model is used for overcoming the interference caused by the non-uniformity of the background gray scale and solving the difficulty of extremely low contrast ratio of the weak edge, so that accurate partitioning for the edge of a mura defect can be realized.
Owner:南京汇川图像视觉技术有限公司

Clamping deformation resistant jig for machining large-diameter elbow

The invention discloses a clamping deformation resistant jig for machining a large-diameter elbow. Three combined clamping blocks are arranged on a clamping base plate, each combined clamping block consists of an upper clamping block, a lower clamping block, a base plate and connecting bolts, inner sides of the upper clamping blocks and the lower clamping blocks are provided with circular arc-shaped gaps and form a circle consistent with the outer circumference of an elbow to be machined after closed, the upper clamping blocks and the lower clamping blocks are connected and fastened by the connecting bolts, and the base plates are arranged at the bottoms of the lower clamping blocks and are provided with chutes. Lock bolts pass through the chutes on the base plates of the combined clamping blocks and fix the combined clamping blocks on the clamping base plate after being fastened. In the invention, the large-diameter elbow is clamped by adopting a way of directly clamping a pipe blank in a surface-contact manner, thus the elbow does not generate a radial compaction force in the clamping process and is not easy to generate the radial forced deformation and the torsional moment; in addition, the clamping deformation resistant jig disclosed by the invention is applied to machining of a large-diameter thin-wall elbow machine, thereby ensuring the machining precision of the elbow.
Owner:扬州华宇管件有限公司

Rotor non-trial-weight dynamic balancing method suitable for distributed unbalance

The invention discloses a rotor non-trial-weight dynamic balancing method suitable for distributed unbalance. The method includes the steps that firstly, on the basis of an established rotor finite element dynamic model, correction of the dynamic model is achieved through experiments and simulation, and then finite element node stress is used for describing the distributed unbalance of a rotor; secondly, dimensions of a dynamic transfer matrix in a describing equation of the distributed unbalance are extended through increase of the test rotating speed, reversibility of the transfer matrix is achieved, and then solution of the distributed unbalance is achieved through matrix inverse operation; finally, precise dynamic balance of the rotor is achieved through a concentrated correction method of the distributed unbalance. According to the rotor non-trial-weight dynamic balancing method suitable for the distributed unbalance, the distributed unbalance can be recognized integrally, and the dynamic balance precision is improved; no test weight is needed in the dynamic balance process, dynamic balance can be completed with the only requirement that the speed is lower than a critical rotating speed, safety of dynamic balance operation is guaranteed, and the requirements of the high-speed rotor are met; the dynamic balance process is concise, and automatic control of computers is achieved conveniently.
Owner:XIDIAN UNIV

Cyanobacterial bloom predicting method based on non-linear kinetic time-series model

The invention discloses a cyanobacterial bloom predicting method based on a non-linear kinetic time-series model, which belongs to the water environment predicting field. The method comprises the following steps: using the blue algae growth rate as a time-varying parameter; creating a non-linear kinetic time-series model for the cyanobacteria growth with double nutrient salt cycling; using the combination of the numerical algorithm and the intelligent evolutionary algorithm, optimizing the constant parameters in the non-linear kinetic time-series model for the cyanobacteria growth; through setting the multivariate time-series model to realize the prediction of the time-varying parameter and the cyanobacteria biomass and through using the bifurcation theory and the central manifold theory to make a nonlinear kinetic analysis of the cyanobacteria growth time-varying system, obtaining the outbreak conditions for a cyanobacteria bloom so as to make an early warning of the bloom outbreak. The method proposed by the invention not only determines the conditions for a cyanobacteria bloom outbreak, but also improves the bloom prediction accuracy, providing an effective reference for an environmental protection department and governance decisions for water environment treatment.
Owner:BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY

High-availability industrial Ethernet redundancy method

The invention relates to a high-availability industrial Ethernet redundancy method, which comprises the following steps: adding a link redundancy entity on an original data link layer of the Ethernet for managing the sending and receiving of data frames of the Ethernet; setting two network adapter drivers relative to an original protocol stack for managing two network adapter interfaces; connecting a double-connected node which comprises the link redundancy entity and the two network adapter drivers to two independent networks respectively through two network adapters; adding a redundancy control tracker for the data frames on the link redundancy entity for distinguishing the data frames with the same content; sending the data frames which have the same content and is provided with the redundancy control tracker to two mutually-independent networks by the double-connected node through the two network adapters; keeping effective frames and discarding copy frames; and setting up a node table. The method has the characteristics of transparency, self-healing property and compatibility and the like; and the reconstruction thereof is simple, and the safety performance of the system is increased so as to enable the system to have high usability.
Owner:MICROCYBER CORP

Method for obtaining parameter of overhead line subjected to creep elongation

The invention provides a method for obtaining a parameter of an overhead line subjected to creep elongation. The method comprises: fitting airborne laser LiDAR point cloud data under an instant working condition to obtain maximum arc sag of a power line under the instant working condition; according to a relation between the maximum arc sag of the power line and a lowest point stress as well as the maximum arc sag of the power line under the instant working condition, calculating the lowest point stress of the power line under the instant working condition; according to the obtained lowest point stress of the power line under the instant working condition, calculating a lowest point stress of the power line under a to-be-calculated working condition; and according to the obtained lowest point stress of the power line under the to-be-calculated working condition, a catenary equation of the power line and the airborne laser LiDAR point cloud data, obtaining a curve of the power line under the to-be-calculated working condition. The power line parameter obtained with the method is high in credibility; uniform standards are provided for measurement of the parameter after the creep elongation; and the method can be used in different working conditions.
Owner:SGCC GENERAL AVIATION +3

Multi-dimension SAR image edge detection method based on improved Wedgelet

The invention discloses an SAR image edge detection method based on the multi-scale Wedgelet transformation which relates to the image processing field. The SAR image edge detection method aims at solving the problem that the traditional edge detection method is difficult to suppress the noise and carry out complete and accurate positioning of the edge simultaneously. The procedure is as follows: 1. an SAR image is converted into a gray-scale image which is divided into a plurality of sub-images; 2. the multi-scale Wedgelet decomposition is self-adaptively carried out to each sub-image according to the scale from bottom to top, and the decomposition coefficients of various scales are stored by using a quadtree; 3. the multi-scale Wedgelet approximation is carried out to each sub-image according to the coefficient quadtree obtained by the decomposition, and the multi-scale Wedgelet approximation of the whole image is finally obtained; 4. the edge of the approximated image is detected through edge extraction of gradient operators according to the obtained multi-scale Wedgelet approximated image; 5. the interference of the miscellaneous edges with the length of less than the set threshold on the edge image in the edge image is removed. The SAR image edge detection method has the advantages of fast running time and good edge detection effect, thereby being capable of being used in the edge detection of the SAR image.
Owner:探知图灵科技(西安)有限公司

GPS synchronization method of distributed testing system

The invention discloses a GPS synchronization method of a distributed testing system. The problem that the distributed testing systems are hard to be mutually synchronized since the independent working of each testing point causes the physical dispersion and isolation in the transient signal testing is solved by use of the method oriented to an application of the current mainstream distributed testing system. The method comprises the step of precisely measuring a time difference between a PPS pulse signal produced by a designed GPS synchronization unit and a received tested signal, wherein the time differences respectively measured by the testing points and the UTC time are upload to a computer so as to establish the time unification taking the PPS pulse as the standard on the computer. The GPS synchronization unit designed by the invention comprises a GPS timing module, a control chip FPGA and high-precision clock source, an EEPROM memory, and a USB interface. The GPS synchronization method disclosed by the invention is suitable for the synchronization of the distributed testing system under the outdoor open environment. The prominent problems of low reliability and high work amount in the wire synchronization are solved in a wireless synchronization method; the method is high in precision, simple in operation and easy for engineering realization.
Owner:ZHONGBEI UNIV

A reverser for driving four electromotor asynchronization and realizing rotor frequency conversion speed-adjusting system

The invention relates to a system that an inverter drives four motors asynchronously and simultaneously to realize the speed regulation of a rotor by variable frequency. The system comprises a motor unit, a rectifier unit, a current limiter unit, a chopper unit, an isolator unit, an active inverter, an A / D converter unit, a signal processor unit, a current detector unit and a voltage detector unit and adopts the inverter control theory and the CPU control technique to conduct the on-line control to the four motors. The voltage output by one inverter is served as the additional counter-electromotive force for each motor; PWM signals outputted by each actuator are used for effectively realizing the continuity and the disconnection of each chopper so as to realize that a crane can fulfill four actions of lifting, variation of amplitude, revolving and traveling. The system provided by the invention simplifies the circuit, reduces the volume and the cost and improves the reliability; when the crane is on the rise, extra power can always be fed back to the motor through the same inverter so as to ensure that when the crane descends, the motor is in a state of power generation and the generated power energy is again fed back to the motor or a power grid through the same inverter, thus realizing energy recovery and conservation.
Owner:HUBEI CHUANGQUAN ELECTRIC CO LTD
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