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48 results about "Sum squared error" patented technology

The sum of the squares errors is a measure of the variance of the measured data from the true mean of the data. The sum of the errors is zero, on the average, since errors can be equally likely positive or negative.

Ship autopilot composite neural network PID control method

The invention relates to a ship autopilot composite neural network PID control method. The method comprises the following steps: providing a composite neural network four-layer structure which comprises an error sequence input layer, a network algorithm hidden layer, a network output layer and a network identification layer; determining the number of neurons and parameter values of each layer through open-loop test training learning, wherein the output layer is composed of three adjustable PID control parameters with non-negative values larger than zero; taking a performance index function ofthe error quadratic sum to set a gradient steepest descent method of a weighting coefficient, and adding an inertia term to prevent local convergence; increasing jacobian information of the output course of the ship to the input steering angle, improving the learning capacity and sensitivity to control characteristics, and achieving PID control parameter online self-adaptive adjustment. Accordingto the control method disclosed in the invention, the course keeping control performance of the ship uncertain motion can be improved; a neural network algorithm improved by Jacobian information identification based on a gradient steepest descent method and ship course keeping and embedding of a radial basis Gaussian function into a back propagation hyperbolic function can be used to solve the problems of large course deviation amplitude and high course reciprocating crossing frequency, and energy conservation and consumption reduction are realized.
Owner:SHANGHAI MARITIME UNIVERSITY

Method and device for checking model feature significance based on multi-party security calculation

The embodiment of the invention provides a method and device for checking the feature significance of a linear regression model based on multi-party security calculation. The method is executed by equipment of a first data holder in a plurality of data holders. N samples and model parameters of the model are jointly stored in respective devices of a plurality of data owners. The method comprises the steps of jointly executing matrix addition and matrix multiplication based on secret sharing with devices of other data owners to obtain an error quadratic sum of the N samples; jointly executing matrix addition and / or matrix multiplication based on secret sharing with other data holder equipment to obtain the value of the jth item on the diagonal line of the first matrix; calculating a secondnumerical value corresponding to the jth t test value; and executing matrix addition based on secret sharing in combination with equipment of other data owners to obtain the jth t test value, so as todetermine the significance of the corresponding characteristics of the linear regression model based on the jth t test value.
Owner:ALIPAY (HANGZHOU) INFORMATION TECH CO LTD

Traveling-wave tube internal temperature soft-measurement method based on finite element model

ActiveCN104915493ALow implementation costIntegrity and reliability of temperature valuesSpecial data processing applicationsElement modelEngineering
The invention discloses a traveling-wave tube internal temperature soft-measurement method based on a finite element model. With multi-point temperature values of the shell of a traveling-wave tube as auxiliary variables, the finite element soft-measurement thermal model of the traveling-wave tube is created; with heat source distribution as independent variables, a target function of an error sum of squares between the multi-point temperature measurement values of the shell and corresponding point temperature simulation values of the finite element thermal model of the traveling-wave tube is derived, and is solved by an iterative algorithm, so that an optimal heat source distribution solution is obtained, finally, the optimal heat source distribution solution is loaded into the finite element thermal model of the traveling-wave tube, and an internal temperature soft-measurement value of the traveling-wave tube is obtained by finite element stimulation calculation. The traveling-wave tube internal temperature soft-measurement method based on the finite element model breaks through the limitation of conventional detection, and prevents a series of complex problems brought about by temperature sensors placed in traveling-wave tubes, measurement is convenient, the implementation cost is low, and the traveling-wave tube internal temperature soft-measurement method based on the finite element model can be applied in the mass testing of traveling-wave tubes.
Owner:SOUTHEAST UNIV

Data fitting-based law research method for content of rare earth elements in rare earth ore tailings

The invention discloses a data fitting-based law research method for content of rare earth elements in rare earth ore tailings. According to collected data on the change of the rare earth content along with the change of the depth, the rare earth elements retained in the tailings are analyzed by adopting a curve fitting method. Firstly, a scatter diagram is drawn according to original data, then alocal weighted linear regression algorithm is adopted for giving certain weights to all points near all to-be-predicted points, and regression is carried out on the basis of a minimum mean square deviation, so that a basic regression curve trend of the data is obtained. Then, according to the obtained basic curve trend, and in combination with a final curve obtained by a least square method, an optimal curve is obtained by minimizing a quadratic sum error, so that a retention law of the rare earth elements in the tailings is obtained.
Owner:NANJING UNIV OF INFORMATION SCI & TECH

Block-based texture synthesis method and device

InactiveCN103440618ASolve the problem that the error calculation takes a long timeGuaranteed synthetic effectGeometric image transformationPattern recognitionFast Fourier transform
The invention discloses a block-based texture synthesis method and device. The method comprises the following steps of: searching an overlapped area of each candidate texture block in a candidate texture block set and synthesized texture blocks in a target texture map; marking the overlapped areas in the synthesized texture blocks with B1ov, marking the overlapped regions in the candidate texture blocks with B2ov, calculating the square and errors of every pixel value of the overlapped parts between the candidate texture blocks and a synthesized texture area, and calculating the multiplication dot and errors of every pair of corresponding pixels in the overlapped areas between the candidate texture blocks and the synthesized texture area; calculating the square and errors by adopting an integral image method, and calculating the multiplication dot and errors by adopting FFT (fast Fourier transform); determining optimal texture blocks according to SSD (sum-of-squared differences) corresponding to every candidate texture block; and synthesizing the optimal texture blocks and the synthesized texture blocks in the target texture map, and repeating the steps until the texture synthesis of the target texture map is finished. The method and device accelerate the texture synthesis speed.
Owner:YUNNAN UNIV

K-means three-dimensional clustering algorithm-based wind pressure coefficient rapid partitioning method and system and storage medium

The invention discloses a K-means three-dimensional clustering algorithm-based wind pressure coefficient rapid partitioning method and system, and a storage medium. The method comprises the steps of firstly obtaining wind pressure coefficient data of building surface points; establishing a K-means clustering algorithm model, and dividing the K-means clustering algorithm model into K clusters; respectively calculating the distance between each cluster center and the cluster center; minimizing an error quadratic sum of the clusters; calculating a clustering number K value range; finally, calculating a unified index parameter value and determining an optimal K value; and outputting cluster results. According to the wind pressure coefficient rapid partitioning method provided by the invention,on the basis of one-dimensional clustering of wind pressure extreme value gradient information, a certain weight is given to each parameter in a K-means clustering algorithm, the influence of spatialposition information is considered to assist wind pressure partitioning, and a k value selection range is reduced according to a method based on error sum of squares and contour coefficients. And anoptimal k value is determined by adopting a series of clustering indexes and engineering indexes. By means of the method, the wind pressure coefficient partitioning work can be well completed.
Owner:CHONGQING UNIV

State estimation method based on combination of BP neural network and D-S evidence theory

The invention discloses a state estimation method based on combination of a BP neural network and a D-S evidence theory. The state estimation method comprises the steps of: (1) constructing evidence of the D-S evidence theory by using an output result of the BP neural network; (2) proposing a way of using the output result of the BP neural network after normalization as evidence for determining basic credibility assignment in the D-S evidence theory since the D-S evidence theory is a powerful method for processing uncertain information; (3), and carrying out evidence combination calculation toobtain an estimated state. The state estimation method is simple, has good stability of estimation results, uses a value of a sum of square error function (SSE) of the BP neural network to representuncertainty evidence, and forms a plurality of BPA by adopting a plurality of BP networks.
Owner:JIANGSU MARITIME INST

Combined prediction method based on double-cycle Holt-Winters model and SARIMA (Spatial ARIMA Model Architecture) model

The invention discloses a combined prediction method based on a double-period Holt-Winters model and a SARIMA model, and belongs to the field of wireless network flow prediction and network optimization. The method comprises the following steps: firstly, extracting m pieces of wireless network flow data of a base station, carrying out double-period Holt-Winters model prediction and SARIMA model prediction with a prediction step length of k by utilizing first m-k items of data, respectively storing the data into an array, respectively comparing original flow data at m-k-m moments with prediction result sums, and calculating error quadratic sums EDHW and ESA; determining weight coefficients of the DHW model and the SARIMA model by using an error quadratic sum reciprocal method; and similarly, carrying out double-cycle Holt-Winters model prediction and SARIMA model prediction on the first m items of data, storing prediction results at m + 1 to m + k moments into arrays yDHW and ySA, and carrying out weighted combination on the prediction results at the corresponding moments by utilizing weight coefficients wDHW and wSA to obtain prediction results ycombine [i] of subsequent k time granularities. And finally, the change condition of the flow data in the next k hours is observed by utilizing a prediction result. The method is high in calculation efficiency, and improves the stability and accuracy.
Owner:BEIJING UNIV OF POSTS & TELECOMM

Modeling method for support vector machine for bridge crane through bulged ring crossover operation RNA-GA

ActiveCN108341342AReflect nonlinear characteristicsGeometric CADTravelling cranesSupport vector machineModel method
The invention discloses a modeling method for a support vector machine for a bridge crane through bulged ring crossover operation RNA-GA, and belongs to the field of intelligent modeling. The modelingmethod comprises the following steps: 1) acquiring the sampling data input and output by a bridge crane system through an experiment or field acquisition, and taking the error square sum of the expected output and the actual output as the target function of the RNA-GA; 2) abstracting out the modeling method for the support vector machine for the bridge crane through the bulged ring crossover operation RNA-GA through the enlightening of the molecular bulged ring structure of RNA; 3) setting the running parameters of an algorithm; and 4) running the bulged ring crossover RNA-GA to acquire the optimal values of the parameter estimation of a support vector machine model with the least square estimation model for the position of the bridge crane and a support vector machine model with the least square estimation model for the oscillating angle of the bridge crane separately, and substituting the optimal values into the support vector machine models with the least square estimation models to form a bridge crane model. The modeling method for the support vector machine has the advantages of being high in convergence rate, high in accuracy, and the like, and is also applicable to modelingfor other complex systems.
Owner:ZHEJIANG UNIV

IM/DD-OFDM/OQAM-PON system channel estimation method based on ANN_LS

The invention discloses an IM / DD-OFDM / OQAM-PON system channel estimation method based on ANN_LS, and the method comprises the steps: firstly collecting time domain data, and carrying out the forward propagation through the time domain data; carrying out reverse propagation by using a gradient descent algorithm to continuously adjust W and b of the algorithm so as to minimize the sum of squares of errors of the whole algorithm and further obtain a transfer function (TF) of the system; and finally, carrying out channel estimation by using LS in a frequency domain. Simulation results show that when the optical fiber transmission distance is long, compared with an algorithm based on ANN channel estimation, higher CE precision can be obtained based on the ANN_LS algorithm, and better system optimization performance is achieved.
Owner:XIAN UNIV OF POSTS & TELECOMM

Automatic route network evaluation method, electronic equipment and storage medium

The invention discloses an automatic route grid evaluation method, electronic equipment and a storage medium, and the method comprises the steps: reading and processing data source information and travel data, and storing the data source information and travel data to a big data platform; for the travel data, selecting indexes capable of describing the aviation market, analyzing the aviation market in a clustering mode, dividing the aviation market, and calculating parameters of an air route network evaluation market by combining Logistic regression and a deep neural network method in each obtained classification; calling the parameters and the flight plan, and calculating the market share of the journey and the passenger rate of the flight; if the information of a certain flight is manually adjusted, recalculating the index of the flight route aviation market where the flight is located; and judging the category of the cluster of the route network evaluation market where the route islocated in an error quadratic sum mode and storing the category. From the perspective of automation, an original mode based on subjective experience is converted into a calculation mode based on a model, manual intervention is reduced, the transport capacity arrangement of airlines is better adjusted, and high fault tolerance is achieved.
Owner:中国南方航空股份有限公司

Electric steering engine simulation modeling method based on parameter identification

PendingCN113688474AAvoid the problem of large simulation deviationShort build cycleGeometric CADDesign optimisation/simulationModelSimSimulation
An electric steering engine simulation modeling method based on parameter identification aims at solving the problems that accurate simulation data is not easy to obtain due to the fact that friction link analysis is complex and rotational inertia influence factors are many in actual modeling; instead of analysis step by step, an overall equivalent mode is adopted, wherein the rotational inertia and the friction coefficient of the multi-stage links are concentrated on two parameters for overall conversion. In this way, the rising time Tr and the overshoot sigma of a typical input signal are used as target values, and a Matlab M script file is used for programming simulation. Then, according to mechanism analysis of the electric steering engine, through Laplace transformation derivation, a preliminary simulation model is built, an iterative calculation program is written, and the rise time Tr and the overshoot sigma which are calculated through simulation each time are compared with target values; and the deviation degree is calculated by adopting an error sum of squares minimum principle, and the rotational inertia and the friction coefficient meeting the error range requirement are searched, so that the purpose of establishing an accurate model is achieved.
Owner:北京航天飞腾装备技术有限责任公司

Differential privacy protection clustering method based on K-means

The invention discloses a differential privacy protection clustering method based on Kmeans. The method comprises the steps of data preprocessing, clustering iteration and differential privacy; wherein each iteration needs to be carried out as follows: setting a privacy budget, calculating noise, calculating the sum of data points of each cluster and the number of points, and then adding the calculated noise to the data points; for each iteration, maintaining the upper bound and the lower bound of one privacy budget, selecting adaptive privacy budget allocation between the upper bound and thelower bound according to the availability and the privacy protection degree, and repeating the steps until the sum of squares of errors converges or reaches the upper limit of the number of iterations. According to the method, in the iteration process of the Kmeans clustering algorithm, through adaptive privacy budget allocation, data privacy is protected on the basis of data distortion, and dataavailability is guaranteed.
Owner:NANJING UNIV OF POSTS & TELECOMM

Combined evaluation method based on feedback adjustment weight

PendingCN113947280AStrong combination resultsEasy to combineResourcesEvaluation resultAlgorithm
According to the combined evaluation method based on the feedback adjustment weight, the difference characteristics and the similarity characteristics between different objects to be evaluated can be fully reflected, and scheme decision making and sorting are facilitated. The evaluation method comprises the following steps: obtaining an initial weight value based on a deviation maximization combined evaluation method; adjusting the initial weight by taking the weighted error sum of squares as an optimization target to obtain a final weight combination; using the final weight combination for combined evaluation, obtaining a comprehensive evaluation result, so that the difference characteristics between different objects to be evaluated are fully reflected; and meanwhile, enabling the sum of squares of weighted errors to be minimum, thus, the similarity characteristics between different objects to be evaluated are fully reflected. According to the evaluation method, the combination result consistency is higher, and the combination effect is better. The whole evaluation process is clear in concept and definition, and the calculation method is simple and convenient to apply.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY

Autocorrelation function processing method at zero time delay of radar based on damping fitting

The invention discloses a method for processing the autocorrelation function at the zero-time-delay point of radar based on damping fitting, which mainly solves the problem that the existing incoherent scattering radar cannot accurately obtain the information at the zero-time-delay point when detecting the ionosphere. The implementation plan is: 1) use the algorithm to calculate the combined measured autocorrelation value L; 2) establish the damping function model, and set the value range and search step size of each parameter in the model; 3) obtain the combined fitting according to the damping function model Autocorrelation value S expression, select parameters multiple times within the parameter value range, calculate the corresponding residual error sum of squares by L and S, and compare to obtain the minimum residual error sum of squares; 4) The parameters corresponding to the minimum residual error sum of squares The value determines the final damping function model, so that the zero-time-delay fitted autocorrelation value is calculated. The processing process of the invention is simple and easy to realize, and the data information at the zero time delay is reserved, and the deficiency of the existing non-coherent scattering radar in the processing of the zero time delay autocorrelation function is made up.
Owner:XIDIAN UNIV

Fuel cell optimization modeling approach with adaptive genetic strategy rna-ga

The invention discloses a fuel cell optimization modeling method with an adaptive genetic policy RNA-GA. The method comprises the steps of 1) obtaining sampling data of an input current and an output voltage of a proton exchange membrane fuel cell through field operation or experiment; 2) taking an error square sum of sampling data of an estimated output and an actual output of a fuel cell model as an objective function during RNA-GA optimization search; 3) setting algorithm running parameters; and 4) running the RNA-GA to estimate unknown parameters in the fuel cell model, obtaining estimated values of the unknown parameters in the model by minimizing the objective function, and substituting the estimated values of the unknown parameters into the fuel cell model, thereby forming a mathematic model. According to the method, a decision is made to execute crossover or mutation operation by applying the adaptive genetic policy, so that the population diversity is effectively kept and the convergence speed of an algorithm to a global optimal solution is increased; the obtained fuel cell model parameters are reliable; and the method is also suitable for optimization modeling of other complex chemical reaction processes.
Owner:ZHEJIANG UNIV

Pairing transaction co-integration relationship acceleration verification method based on E-G two-step method

The invention discloses a pairing transaction co-integration relationship accelerated verification method based on an E-G two-step method. The method comprises the steps of obtaining two time sequences of a to-be-verified co-integration relationship; carrying out augmented Dickey-Fuller test on a residual error and a difference of the residual error, wherein a regression analysis result corresponding to the maximum lag order is solved by utilizing an LDLT decomposition method; obtaining regression analysis results corresponding to all lag orders according to the regression analysis result corresponding to the maximum lag order, and obtaining a corresponding error quadratic sum; utilizing an optimized akaike information criterion formula to calculate akaike information criterion function values corresponding to all the lag orders; selecting the lag order corresponding to the minimum akaike information criterion function value as the optimal lag order; and obtaining a regression coefficient corresponding to the optimal lag order. According to the invention, algorithm intensity reduction and approximate calculation are performed by applying a common least square method algorithm for many times in a traditional algorithm, and a verification speed of the co-integration relationship of the two time sequences is increased.
Owner:NANJING UNIV

A large-scale data distributed clustering processing method based on mapreduce

ActiveCN107291847BReduce the number of clustering iterationsImprove accuracyVisual data miningStructured data browsingAlgorithmLarge scale data
Provided by the present invention is a MapReduce-based distributed cluster processing method for large-scale data, which comprises: sampling large-scale data according to an equal-scale non-repetition principle; inputting the sampled data into a MapReduce distributed parallel framework, and calculating the local density and average density of the sampled data; finding all sampled data having a local density greater than the average density to serve as a candidate point set of initial cluster center points for each cluster, and feeding the candidate point set back to a master node, wherein every two adjacent candidate points at a distance from each other which is greater than twice that of a set range are selected to serve as the initial cluster center points; using the MapReduce distributed parallel framework to perform a parallel clustering task, wherein an average value of the distance between the data is calculated for each cluster in order to update the cluster center points; child nodes applying an error sum of squares criterion function so as to determine whether to continue iteration; the child nodes performing clustering on the large-scale data according to the cluster center points. By means of the present invention, parallel clustering is implemented, thereby reducing the number of clustering iterations, while increasing clustering accuracy and the efficiency of parallel clustering.
Owner:北京点为信息科技有限公司

A method of image target detection based on dc-spp-yolo

The invention discloses an image target detection method based on DC-SPP-YOLO. Firstly, a data enhancement method is used to preprocess the training image samples and a training sample set is constructed, and a k-means clustering algorithm is used to select a target bounding box prediction The prior candidate frame of the YOLOv2 model; then the convolutional layer connection method of the YOLOv2 model is improved from layer-by-layer connection to dense connection, and at the same time, spatial pyramid pooling is introduced between the convolution module and the target detection layer to establish DC-SPP-YOLO target detection Model; finally, the loss function is constructed by the sum of squared errors between the predicted value and the real value, and the weight parameters of the model are updated iteratively to make the loss function converge, and the DC‑SPP‑YOLO model is obtained and used for target detection. The present invention considers the "gradient disappearance" caused by deepening the convolutional network and the YOLOv2 model does not fully use the multi-scale local area features, and constructs the improved DC-SPP-YOLO target detection model based on the dense connection of the convolutional layer and the spatial pyramid pooling. Improved object detection accuracy.
Owner:BEIJING UNIV OF CHEM TECH

Bridge crane support vector machine modeling method for protruding ring crossing operation rna-ga

ActiveCN108341342BReflect nonlinear characteristicsGeometric CADTravelling cranesAlgorithmIntelligent modeling
The invention discloses a modeling method for a support vector machine for a bridge crane through bulged ring crossover operation RNA-GA, and belongs to the field of intelligent modeling. The modelingmethod comprises the following steps: 1) acquiring the sampling data input and output by a bridge crane system through an experiment or field acquisition, and taking the error square sum of the expected output and the actual output as the target function of the RNA-GA; 2) abstracting out the modeling method for the support vector machine for the bridge crane through the bulged ring crossover operation RNA-GA through the enlightening of the molecular bulged ring structure of RNA; 3) setting the running parameters of an algorithm; and 4) running the bulged ring crossover RNA-GA to acquire the optimal values of the parameter estimation of a support vector machine model with the least square estimation model for the position of the bridge crane and a support vector machine model with the least square estimation model for the oscillating angle of the bridge crane separately, and substituting the optimal values into the support vector machine models with the least square estimation models to form a bridge crane model. The modeling method for the support vector machine has the advantages of being high in convergence rate, high in accuracy, and the like, and is also applicable to modelingfor other complex systems.
Owner:ZHEJIANG UNIV

Earth pressure balance shield tunneling machine propelling speed control method, modeling method and device

PendingCN114063455APropulsion speed automatic controlHigh precisionAdaptive controlAutomatic controlSum squared error
The invention discloses an earth pressure balance shield tunneling machine propelling speed control method, a modeling method and a modeling device. Aiming at a propelling speed subsystem of an earth pressure balance shield tunneling machine, with a propelling speed control quantity used as a control input variable, a soil bin pressure, a total propelling force and a cutter head rotating speed used as measurable interference variables, and the actual propelling speed of the shield tunneling machine used as an output variable, an RBF-ARX model of the propelling speed subsystem is constructed. The optimal RBF-ARX model parameters and structure for describing the dynamic characteristics of the propelling speed of the shield tunneling machine are obtained by minimizing the sum of squares of errors between predicted output of the RBF-ARX model and the actual value of the propelling speed under the constraint condition of a propelling speed dynamic response mode through utilizing actual sampling data of the propelling system of the earth pressure balance shield tunneling machine. A propelling speed prediction controller is designed based on the RBF-ARX model, and technical support is provided for achieving automatic control over the propelling speed of the earth pressure balance shield tunneling machine.
Owner:CENT SOUTH UNIV

Transfer equipment consumption optimal combination prediction method based on uncertain weight

The invention relates to a turnover equipment consumption optimal combination prediction method based on an uncertain weight. The method comprises the following steps: respectively constructing single prediction models by adopting a three-term moving average method, a four-term moving average method, a primary exponential smoothing method, a secondary exponential smoothing method, a cubic exponential smoothing method, a grey system prediction method and a unary regression analysis method; constructing a combined prediction model by using different numbers of single prediction models; performing optimization combination on the seven different single prediction models, comparing weighting coefficients which are respectively solved by adopting an arithmetic average method, a simple weighted average method and a quadratic programming method, and selecting an optimal weighting coefficient as a weighting coefficient of the combined model; and comprehensively evaluating the combined prediction model by adopting the error sum of squares, the mean square error and the Hille unequal coefficient, selecting one group with the minimum prediction error as an optimal combined prediction model, and predicting the consumption of the turnover equipment according to the optimal combined prediction model. The method is high in precision of predicting the consumption quantity of the turnover equipment.
Owner:中国人民解放军海军航空大学青岛校区

Wind direction clustering method and device and electronic equipment

ActiveCN113052256ASolve the shortcomings of not being suitable for periodic wind direction data clusteringGuaranteed reliabilityCharacter and pattern recognitionEngineeringCluster based
The invention provides a wind direction clustering method and device and electronic equipment, and the method comprises the steps: obtaining the periodic wind direction data of each fan of a wind power plant; determining a similarity measurement index suitable for the periodic wind direction data according to the periodic wind direction data; based on a similarity measurement index, selecting k clustering centers, and dividing the periodic wind direction data into k clusters; determining an error sum-of-squares criterion function based on the periodic wind direction data; and evaluating the clustering effect of the k clusters based on an error sum of squares criterion function, and determining a final clustering effect. The similarity measurement index and the error sum of squares criterion function suitable for the periodic wind direction data are determined through the periodic wind direction data, so that the defect that a traditional K-means algorithm is not suitable for clustering the periodic wind direction data is overcome, and the reliability and authenticity of a clustering result are ensured; and reliable and reasonable fan division can be obtained according to a clustering result, so that the subjectivity of manual sector division is avoided.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1

Method for processing measured data of multispectral radiation thermometer

The invention discloses a method for processing measured data of a multispectral radiation thermometer, solves the problem that an existing data processing method of the multispectral radiation thermometer is only suitable for a few materials, and belongs to the technical field of spectral data processing. The invention relates to a method for processing measured data of a multispectral radiation thermometer. The method comprises the following steps: S1, acquiring measured data xk of the multispectral radiation thermometer and a corresponding real temperature yk; s2, according to xk and yk, fitting by using y = a0 + a1x +... + amxm to obtain a residual error sum of squares Q; s3, removing the mth term, and fitting by using y = a0 + a1x +... + am-1xm-1 to obtain a residual error sum of squares Q '; and S4, acquiring a variance ratio Fm according to the Q and the Q ', judging whether the Fm is greater than a critical value Falpha, if so, determining that m is equal to m + 1, and turning to S2, otherwise, according to the value of the current m, adopting y = a0 + a1x +... + am-1xm-1 as a fitting curve model of the measurement data of the multispectral radiation thermometer.
Owner:天合(无锡)仪器有限公司

Transformer area line loss data processing method and device based on Canopy-Kmedoids algorithm, and medium

The invention provides a transformer area line loss data processing method and device based on a Canopy-Kmedoids algorithm, and a medium, and the method comprises the steps: collecting basic data information of a power distribution network transformer area, wherein the basic data information comprises static parameters of the transformer area, and screening a transformer area sample set with a stable line loss rate based on the static parameters; and analyzing transformer area line loss rate influence factors based on the basic data information, selecting transformer area static parameters with a large influence degree, adopting a Canpoy algorithm to carry out coarse clustering on a data set, taking a central point of a Canpoy subset as an initial central point of a K-medoids algorithm to carry out fine clustering, calculating the sum of squared errors (SSE) of each clustering scheme, making an elbow diagram according to the sum of squares of errors of each clustering scheme, selecting a K value at an inflection point of the elbow diagram as an optimal K value as an optimal result, performing line loss calculation of the transformer area by using the optimal result, and controlling a power grid according to a line loss calculation result. The method improves the clustering effect, and enables the line loss calculation to be accurate and objective.
Owner:STATE GRID JIBEI ELECTRIC POWER COMPANY +2

A fitting method of lamb wave spatial sampling signal based on morlet mother wavelet

The invention discloses a Lamb wave spatial sampling signal fitting method based on a Morlet mother wavelet, and belongs to the technical field of engineering structure health monitoring. This method first sets the center frequency, sampling frequency, and sampling time of the Morlet mother wavelet; then constructs the Lamb wave excitation simulation signal according to the number of Lamb wave excitation signal peaks; secondly, according to the Morlet mother wavelet fitting waveform and Lamb wave Excite the correlation coefficient of the simulated signal to obtain the frequency bandwidth parameter of the Morlet mother wavelet; finally, according to the error sum of the squares of the Morlet wavelet function fitting waveform and the Lamb wave spatial sampling signal under different scale factors and displacement factors, obtain the Morlet wavelet function approximation At this time, the corresponding Morlet wavelet function fitting waveform is the Morlet wavelet function fitting waveform of the Lamb wave spatial sampling signal. The invention improves the spatial resolution and length of the Lamb wave spatial sampling signal, thereby helping to promote the application of the space-wavenumber domain signal processing method in the field of engineering structure health monitoring.
Owner:中国人民解放军空军勤务学院
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