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353 results about "Fast evaluation" patented technology

Rock core logging

The invention is provides a method of logging rock core. A digital photograph of core from a borehole is taken and the image is first processed. This involves calibration and correction, or un-distortion, of the digital image. A reference frame is included in the photograph to facilitate processing. The two-dimensional image is then used as a virtual three-dimensional model of the core enabling length and angle measurements to be logged. These include linear rock interval measurements as well as angular measurements of geological structures. The method is implemented using a software program which enables suitable hardware. The software program will be provided on a suitable computer readable medium. Manually logged data of the same kind is imported for comparison to data logged using the software program. All of this data can be displayed on the image and incrementally on a Stereonet as it is logged. A permanent visual record and reliable means of rapidly assessing the accuracy and quality of the data is provided. The invention also provides for automation of a significant part of the image processing and logging. The reference frame is preferably provided by a rock core tray frame having suitable indicators with known dimensions. The frame is rectangular with orthogonal lines on an upper surface. The mid-points of these lines are marked and spaced apart brackets provide for elevated lines superimposed on the orthogonal lines.
Owner:GROUND MODELLING TECH

Digital-controlled finished circuit board reliability quick evaluation method under combined effects of environment

The invention discloses a digital-controlled finished circuit board reliability quick evaluation method under combined effects of environment. The digital-controlled finished circuit board reliability quick evaluation method includes (I) selecting temperatures and direct-current bias as accelerating stress, and building accelerating model for a circuit board to be evaluated; (II) determining accelerating stress level and stress combinatorial number, performing accelerating service life tests in groups, and recording test data; (III) selecting a service life distribution model, solving parameters according to the test data, and calculating characteristic service life values in varied combinations of accelerating stress; (IV) matching and determining model coefficients for the accelerating model of the circuit board according to the characteristic service life values, performing reliability evaluation, and obtaining reliability index of the digital-controlled finished circuit board under combined effects of environment. By the aid of the digital-controlled finished circuit board reliability quick evaluation method, the reliability index of the digital-controlled finished circuit board under combined effects of environment can be quickly and quantitatively determined, requirements of system reliability quick evaluation are met, the whole flow is convenient to operate and high in efficiency, and requirements of high reliability on a digital control system are met.
Owner:HUAZHONG UNIV OF SCI & TECH

Calibration method and device of back scattering coefficient of space-borne scatterometer

The invention provides a calibration method and device of the back scattering coefficient of a space-borne scatterometer. The calibration method comprises the following steps: obtaining a back scattering coefficient corresponding to a wind vector unit in the space-borne scatterometer, the observation geometry of the back scattering coefficient, and reanalysis wind field data matched with the back scattering coefficient and the observation geometry; according to the observation geometry and the reanalysis wind field data matched with the observation geometry, calculating a relative wind direction matched with the observation geometry; according to the relative wind direction, constructing the observation sample set of the obtained back scattering coefficients; and according to a preset standard sample set, calibrating the observation sample set to obtain a calibration result to show whether the back scattering coefficient measured by the space-borne scatterometer is correct or not. The reanalysis sea surface wind field data is used for developing a quick evaluation method of the back scattering coefficient of the dual-cosine distribution characteristics of the wind direction on the basis of the back scattering coefficient, the quick evaluation of the back scattering coefficient can be realized in short time, evaluation accuracy is high through the reanalysis data, and meanwhile, the evaluation method is high in universality.
Owner:NAT SATELLITE OCEAN APPL SERVICE +1

Rapid evaluation and optimization method for wind field adaptability of wind generating set based on sector distribution

The invention discloses a rapid evaluation and optimization method for the wind field adaptability of a wind generating set based on sector distribution. By building a wind resource parameter combination mode, sector control strategies are built, a wind generation set operation information database is built, interpolation calculation of the fatigue load and the generation power of the wind generation set is conducted, and the wind field adaptability is rapidly evaluated through an optimization algorithm. According to the characteristic that sector distribution of wind resource parameters is different, the corresponding sector control strategies are formulated and used as the input conditions for simulation of the wind generating set; and the wind generating set operation information database is built in a simulating mode in advance, and the optimization algorithm is adopted, so that rapid evaluation and optimization of the loads and the generating capacities of all machines in a wind field are achieved. The fatigue loads and the annual generating capacities of the machines in the wind field at the early design stage can be reasonably predicted, the design period is greatly shortened, the development cost of the wind field is saved, and fine design of the wind field is achieved.
Owner:CRRC WIND POWER(SHANDONG) CO LTD

Rock block stability fast evaluation method based on three-dimensional outdoor scene and stereographic projection

The invention relates to field of engineering geological exploration analysis and discloses a rock block stability fast evaluation method based on a three-dimensional outdoor scene and stereographic projection. According to the rock block stability fast evaluation method based on the three-dimensional outdoor scene and the stereographic projection, geological investigation personnel versatilely analyze blocks likely to slip conveniently and rapidly in the field environment, visually make an evaluation for a side slope stability state, and qualitatively analyze the stability situation after personnel excavate the side slope at the same time. The method comprises the steps of 1, collecting rock mass structure geological data information in an engineering area; 2, introducing the geological data information to a three-dimensional outdoor scene platform to form three-dimensional terrain; 3, determining a natural rock side slope to be analyzed; 4, in the range of the natural side slope, screening out all structural plane data information; 5, cutting blocks in the three-dimensional outdoor scene platform; 6, generating a side slope stability analysis report according to a polar stereographic projection method; 7, according to a construction scheme, inputting artificial side slope data; 8, according to the polar stereographic projection method, natural side slope data and artificial side slope data, generating a stability report.
Owner:POWERCHINA CHENGDU ENG +1

Method and system for estimating circuit board corrosion risk

The present invention relates to the testing technology field of electronic equipments, especially to a method and system used for assessing circuit boards corrosion risks. According to the method, the surface insulation resistance values of circuit boards are measured and are compared with the corrosion risks discrimination mapping of the circuit boards to get the corrosion risk levels of circuit boards. The present invention also provides a system used for quickly on-site assessing the circuit boards corrosion risks, which comprises a circuit board, a testing module and a discrimination module, wherein the testing module is used for measuring the surface insulation resistance value of the circuit board and sending the measured value to the discrimination module, the discrimination module is used for comparing the surface insulation resistance value measured with the corrosion risks discrimination mapping to get the corrosion risk level of the circuit board. By using surface insulation resistance values easily got on-site to indicate the circuit boards corrosion risks, the present invention is capable of quickly on-site assessing the corrosion risk of a circuit of a board, and then exhibits excellent effect about adopting some protection measures of the circuit board in time.
Owner:HUAWEI TECH CO LTD

Driving motor system performance evaluation method for electric vehicle

The invention discloses a driving motor system performance evaluation method for an electric vehicle. The driving motor system performance evaluation method analyzes from different dimensions such as motor control performance, motor body design and enterprise qualification and ability of the driving motor system according to performance characteristics of a driving motor used for the electric vehicle, adopts an analytic hierarchy process to determine a driving motor performance evaluation index system and index weights thereof, establishes a BP neural network model for driving motor system performance evaluation, organically integrates a bat algorithm with a particle swarm algorithm to form a bat-particle particle swarm hybrid algorithm, and optimizes parameters of the neural network structural model by adopting the bat-particle particle swarm hybrid algorithm. Simulation examples show that, through training and testing data samples, the driving motor system performance evaluation method which optimizes the neural network based on the analytic hierarchy process and the bat-particle particle swarm hybrid algorithm has the advantages of fast evaluation speed and high accuracy rate, achieves satisfying evaluation results, and has certain promotion value in evaluation, selection and application of a driving motor system for the electric vehicle.
Owner:WUXI OPEN UNIV

Method and device for rapidly evaluating electrical durability of relay contact based on machine vision

The invention relates to a method and a device for rapidly evaluating the electrical durability of a relay contact based on a machine vision. The method comprises the following steps of: respectively obtaining side face image sequences of two contacts of a relay and a surface image of a relay contact; obtaining an effective contact distance sequence of the two contacts of the relay contact, and extracting a texture characteristic parameter of the processed surface image of the relay contact; respectively building a BP (Back Propagation) neural network evaluation model and a time sequence evaluation model aiming at the electrical durability of the contact according to the texture characteristic parameter and the effective contact distance sequence; and combining prediction results of the BP neural network evaluation model and the time sequence evaluation model by using a B-spline associative memory network, so as to establish a multi-parameter model for predicting the electrical durability of the relay contact, and evaluate the electrical durability of the relay contact. The device comprises a processor, a first imaging module and a second image module. The method and the device provided by the invention can accurately predict the electrical durability of the relay contact under the condition of not damaging the relay.
Owner:DONGHUA UNIV

Multi-attribute decision tree power grid stability margin assessment method based on linear discrimination analysis

ActiveCN107274105AEasy to findPredictive stabilityResourcesRelational modelDecision taking
The present invention discloses a multi-attribute decision tree power grid stability margin assessment method based on linear discrimination analysis. a key variable discovery model is established based on the offline simulation data and the real-time monitoring data of a power grid to perform effective screening of historical sample data to reduce the data dimensions, a combination relation model among key variables is established to discover the association relation among the variables, extract combination features capable of reflecting important degree contrast of each variable, establish the association relation between the power grid operation state and the transient stability margin, determine the main reasons of system stability level changing, form a concise and accurate knowledge rule base and regulate the decision reference so as to rapidly assess the current stability level according to the system operation state, provide quantification information support for operators' auxiliary decisions and improve the standardization, the rapidity and the adaptive capability of the power grid stability assessment, and therefore the multi-attribute decision tree power grid stability margin assessment method based on the linear discrimination analysis has wide application prospects.
Owner:SHANDONG UNIV +3

Quick estimation algorithm for valve loss of modularized multi-level current converter

The invention discloses a quick estimation algorithm for the valve loss of a modularized multi-level current converter, and the algorithm comprises the steps: 1, building a MMC rapid simulation model according to system parameters and a control method; 2, enabling a submodule capacitor voltage, a switching device trigger pulse and a bridge arm current in the simulation results to be stored as a readable data file; 3, building a mathematic model for switching device loss calculation and PN junction temperature estimation according to the characteristic parameters of a switching device in an MMC submodule; 4, enabling the data file to be imported into a loss calculation program, and calculating the valve loss of a single IGBT and a diode at each data step; 5, carrying out superposition to obtain the valve loss power of the MMC through iterative computation according to the relation between the valve loss power of the IGBT and the diode and the junction temperature. The method solves a problem that the voltage and current of the MMC submodule and the working temperature of a converter valve cannot be calculated precisely through analysis, and can be widely used for the technical field of flexible DC power transmission.
Owner:CENT SOUTHERN CHINA ELECTRIC POWER DESIGN INST CHINA POWER ENG CONSULTING GROUP CORP

Rapid evaluation method for transient angle stability based on comprehensive causal analysis and machine learning

ActiveCN108876163AAvoid Time Domain SimulationCalculation speedResourcesOperation modeCluster based
The invention discloses a rapid evaluation method for transient angle stability based on a comprehensive causal analysis and machine learning, which comprises dividing a historical operation mode sample into several operation mode clusters based on historical data stored by a transient stability evaluation function of online security analysis applications, describing the transient angle stabilitymargin by linearization formula according to the difference between the modes, and extracting a key feature quantity of a power grid; constructing a deep learning model and using a historical data sample to train by taking the key feature quantity as an input quantity and taking a historical operation mode cluster classification as an output quantity, establishing a relationship between a currentreal-time operation mode and the historical operation mode, and estimating the transient angle stability of the current real-time operation mode. According to the rapid evaluation method for transientangle stability based on the comprehensive causal analysis and machine learning, the calculation time consumption can be effectively reduced, and the quantitative analysis results of the power grid transient angle stability can be quickly obtained while ensuring the accuracy of the transient angle stability analysis. This helps to detect the transient operation risks existing in the power grid and improve the safe operation level of the power grid.
Owner:NARI TECH CO LTD +2
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