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30results about How to "Computing speed advantage" patented technology

Method for acquiring parameters of electric power harmonic waves by using Hanniing window function continuous frequency spectrum interpolation

The invention relates to a method for acquiring parameters of electric power harmonic waves by using Hanning window function continuous frequency spectrum interpolation, applicable to harmonic analysis and monitoring on voltage and current of a power network. Firstly, chirp Z transform (CZT) is utilized to accurately extract fundamental wave signal parameters (amplitude, frequency and phase) froman electric signal containing harmonic waves. Then the fundamental wave signal is subtracted from the analyzed electric signal and a Hanning window function is added to cut off the electric signal, and FFT (fast Fourier transformation) is utilized to calculate frequency spectrum of the residual signal. And then frequency values of all the harmonic waves are accurately calculated according to the frequency of a fundamental wave. And finally interpolation is carried out on the Hanning window function in the frequency domain according to each harmonic wave frequency, and the parameter of each electric power harmonic wave is accurately calculated. The method provided by the invention has estimated value accuracy basically equivalent to that of an addition Hanning window FFT bispectrum line interpolation fitting analysis method of electric power harmonic waves, and calculated amount of the method provided by the invention is about 1 / 2 of that of the addition Hanning window FFT bispectrum line interpolation fitting analysis method of electric power harmonic waves.
Owner:CHINA UNIV OF MINING & TECH

Method for analyzing electric network waveform distortions and automatically monitoring electric power harmonic parameters

The invention discloses a method for analyzing electric network waveform distortions and automatically monitoring electric power harmonic parameters, and is applicable for analyzing and monitoring harmonic waves of voltage and current of an electric network. The method comprises the following steps of: firstly, highly-precisely extracting fundamental wave signal parameters (amplitude, frequency and phase) from electric power signals containing harmonic waves by using linear frequency modulation Z transform (Chirp-ZTransform or CZT); secondly, subtracting fundamental wave signals from the analyzed electric power signals, adding Blackman window function interception electric power signals, and calculating the frequency spectrum of remaining signals by using fast Fourier transform (FFT); thirdly, precisely calculating the frequency value of each harmonic wave according to the fundamental wave frequency; and finally, interpolating a Blackman window function in a frequency domain accordingto each harmonic wave frequency, and precisely calculating parameters of each electric power harmonic wave. Compared with a method for analyzing the electric power harmonic waves by adding Blackman window FFT double spectral line interpolation fitting, the method provided by the invention has basically equivalent estimated value precision, and the amount of calculation is about 1 / 2.
Owner:CHINA UNIV OF MINING & TECH

Method for searching for sliding window based on layered segmentation

InactiveCN103870834ANumber of advantagesDominant recallCharacter and pattern recognitionFeature extractionSlide window
The invention discloses a method for searching for a sliding window based on layered segmentation. According to the method, firstly, superpixel segmentation is conducted on an image; secondly, a layered segmentation algorithm of the image is run on the basis of a superpixel segmentation result of the image and a definition of region similarity; thirdly, initial windows are generated according to the layered segmentation result of the image, and the windows are screened according to the priori knowledge of a target; lastly, target candidate windows are collected densely around the remaining windows. By means of the method, on the premise that the target is not missed, only a small number of candidate target positions are generated, and the problem of a large calculated amount of feature extraction and classifier judgment in a target detection task can be effectively relieved.
Owner:WUCHANG INST OF TECH

Method for obtaining continuous frequency spectrum interpolation power harmonic parameter of Nuttall window function

The invention discloses a method for obtaining continuous frequency spectrum interpolation power harmonic parameter of Nuttall window function, and is suitable for harmonic analysis and monitoring of voltage and current of power grid. The method comprises the following steps: performing chirp Z transform (CZT) to extract a fundamental wave signal parameter (amplitude, frequency and phase) at high precision from a power signal containing harmonic; subtracting the fundamental wave signal from the analyzed power signal and adding a cutoff power signal of Nuttall window function, and calculating the frequency spectrum of the residual signal by FFT (fast Fourier transform); calculating the frequency value of each harmonic accurately according to the frequency of the fundamental wave; and finally, interpolating the Nuttall window function in the frequency domain according to the frequency of each harmonic, and accurately calculating the parameter of each power harmonic. The method disclosed by the invention has basically equivalent estimation precision as the method for analyzing power harmonic through FFT double-spectral-line interpolation fitting with Nuttall window, while the calculation quantity is about half of the latter one.
Owner:CHINA UNIV OF MINING & TECH

Wind power output typical scene generation method based on BIRCH clustering and Wasserstein distance

The invention discloses a wind power output typical scene generation method based on BIRCH clustering and a Wasserstein distance, and the method comprises the steps: firstly obtaining an optimal quantile of a wind power probability through the minimization of the Wasserstein distance, and discretizing a continuous probability density function into a plurality of probability density points; performing iterative reduction, splicing and re-reduction on the initial scene set by applying BIRCH clustering to obtain a typical scene set. According to the method, the wind power output scene can be quickly and accurately reduced, and compared with other algorithms, the algorithm has great advantages in calculation time and storage scale.
Owner:STATE GRID JIANGSU ELECTRIC POWER CO LTD NANTONG POWER SUPPLY BRANCH

Method for testing water content and distribution of cellular levels in fruit and vegetable tissues based on Raman spectrum

The invention discloses a method for testing the water content and distribution of cellular levels in fruit and vegetable tissues based on the Raman spectrum. The method comprises: carrying out samplepretreatment; carrying out imaging spectrum acquisition and pretreatment; carrying out Gaussian peak separation fitting on the imaging spectrum and carrying out pseudo color imaging based on a fitting result, and carrying out visualization on the water content and combination state distribution of the cellular levels. According to the invention, the visualization of the distribution of the watercontent and the combination state of the cellular levels in the fruit and vegetable tissues is completed for the first time; and relatively reliable water content quantitative analysis results of different combination states are obtained by visual imaging. The disclosed method can be used as a novel testing method for the water contents of the cellular levels in fruit and vegetable tissues. Therefore, a problem that the water changes of the cellular levels can not be detected in the existing fruit and vegetable processing process is solved; and thus the method has the broad prospects in studying the fruit and vegetable processing.
Owner:SOUTH CHINA UNIV OF TECH

Motor load transient process calculation method suitable for electromagnetic transient simulation

The invention relates to the technical field of power grid transient simulation calculation and specifically relates to a motor load transient process calculation method suitable for electromagnetic transient simulation. The method can quickly calculate load transient characteristics of an induction motor under symmetrical and asymmetrical fault voltage sag of a power system, and is characterizedby (1) firstly, solving a first-order mechanical transient equation of a rotor to obtain changes in speed and slip of the rotor after disturbance; (2) solving a transient potential differential equation in the form of a rotor phasor to obtain change in transient potential; and (3) obtaining current and power response of the motor after the disturbance. Compared with PSCAD / EMTDC electromagnetic transient simulation results, the result of the calculation method verifies effectiveness of the algorithm; and compared with PSD / BPA electromechanical transient simulation results, the result of the calculation method shows the advantages of the algorithm under asymmetric voltage sag. An analytical method explicitly gives computation expressions of mechanical and electrical parameters of the induction motor after the disturbance; and in addition to being used to quickly evaluate mutual influence of the induction motor and the voltage sag, the method can also be used in stability analysis of thepower system.
Owner:GUANGDONG POWER GRID CO LTD +1

Biomechanics modeling method for subcutaneous adipose tissues based on linear elasticity and superelasticity models

The invention relates to a biomechanics modeling method for subcutaneous adipose tissues based on linear elasticity and superelasticity models. According to the biomechanics modeling method, the problems that an existing subcutaneous adipose tissue model is low in simulation accuracy and speed are solved. The biomechanics modeling method comprises the following steps: (1) establishing a geometric model, and dividing grids; (2) establishing a linear elasticity biomechanics model; (3) establishing a superelasticity biomechanics model; (4) carrying out finite element simulation on the superelasticity biomechanics model according to the step (1) and the step (2); (5) carrying out finite element calculation on the linear elasticity model; and (6) carrying out finite element simulation on a mixed linear elasticity and superelasticity model. By virtue of comparison on a simulation result and an experimental result, the accuracy of the biomechanics modeling method is verified. By virtue of comparison on simulation time of the single linear model and superelasticity model, high efficiency of a simulation algorithm of the mixed linear elasticity and superelasticity model is verified. The biomechanics modeling method is applied to the field of biomedical engineering.
Owner:HARBIN UNIV OF SCI & TECH

Logging method of ultrasonic logger system

The invention discloses a logging method of an ultrasonic logger system. An underground gauge of the ultrasonic logger system is of a cylinder shape, m ultrasonic transducers with included angles of theta are evenly distributed at the bottom of the underground gauge, the underground gauge is perpendicularly hung in a well by a cable, the cable is connected with a logging winch by a depth gauge, the logging winch is connected with a well workstation, and the well workstation is connected with a printer. The underground gauge is dropped perpendicularly by the depth gauge, the underground gauge measures the well diameter, the depth gauge measures the dropping length of the cable to obtain the well depth data, and the well diameter data and the well depth data are transmitted to the well workstation. The logging method includes that the well workstation processes the received well diameter data by means of quadratic Bezier curve, or rational quadratic Bezier curve fitting horizontal section algorithm to obtain a well diameter which can correctly reflect the actual shape of a horizontal section.
Owner:SHANDONG UNIV OF SCI & TECH

Transient modeling method for hydrogen circulating pump in fuel cell system

The invention discloses a transient modeling method for a hydrogen circulating pump in a fuel cell system, and the method comprises the steps: carrying out the fitting of a model based on a polynomial regression method, obtaining a relation function of the flow, rotating speed and outlet pressure of the hydrogen circulating pump, coupling an inertia link of a drive motor, and constructing a complete transient centrifugal hydrogen circulating pump model; and finally, performing PID control on the control voltage of the driving motor, obtaining the transient response of the hydrogen circulating pump through coupling calculation of the three models, controlling the hydrogen circulating pump to meet the tail gas recycling requirement of the fuel cell stack, and therefore, the purpose of controlling the hydrogen circulating pump is achieved. The model obviously improves the calculation rate on the premise of ensuring the simulation accuracy, can be used for calculating the working condition of the fuel cell stack in a steady state, can also simulate and calculate the real-time transient response during the variable load of the electric pile under the actual road working condition, can better carry out linkage simulation with the fuel cell system, and the method has important significance for optimizing the control strategy of the fuel cell system.
Owner:TIANJIN UNIV

Single image defogging method and device based on bilateral filtering and median filtering

The invention discloses a single image defogging method and a single image defogging device based on bilateral filtering and median filtering. The single image defogging method comprises the steps of:estimating an atmospheric light value of an original foggy image based on dark channel priori; adopting bilateral filtering for estimating ambient light roughly according to the atmospheric light value; performing median filtering on the ambient light to obtain improved ambient light; and restoring the original foggy image based on the atmospheric light value and the improved ambient light. The single image defogging method combines the advantages of bilateral filtering and median filtering, can fully avoid color oversaturation of the image and a halo effect of image edges, and can effectively deal with the foggy image impurities at the edges and corners.
Owner:QILU UNIV OF TECH

Renewable energy output power probability modeling method based on orthogonal series

The invention discloses a renewable energy output power probability modeling method based on orthogonal series. The method includes the following steps of S1, obtaining a renewable energy output power value through a monitoring system, and selecting a group of standard orthogonal bases to write a function in the form of the orthogonal series; S2, selecting a shrinkage coefficient for the orthogonal series form in the step S1 through a trimming estimator method, minimizing the deviation and variance of a risk function and a balance function to obtain a cut-off point, and finally determining a probability density function; S3, judging whether the probability density function can reflect the true distribution of renewable energy output power or not through test of goodness of fit. The selection of a bandwidth value does not need to be considered, the model calculation process is simple, and the calculation speed is higher; compared with the prior art, the difference of model output value and actual-measurement data is the smallest. Meanwhile, the method is not restrained by time and space conditions and has the advantages of being high in fitting precision, stability and applicability.
Owner:SOUTHEAST UNIV +3

Water resource optimal allocation method and system based on genetic algorithm

The invention provides a water resource optimal allocation method based on a genetic algorithm, and the method achieves the normalization of an economic target, a social target and an ecological target, enables all targets to be subjected to weighted calculation under the same dimensional condition, and enables the weights of all targets to have more practical significance after normalization. Meanwhile, the constructed water resource optimization model has the characteristics of multiple variables, multiple targets, multiple constraints and the like, when the model is solved, a genetic algorithm is adopted, and compared with a traditional solving method, the provided method has great advantages in the aspects of calculation speed, precision, convergence, adaptability and mobility.
Owner:QILU UNIV OF TECH +1

Node current injection based single three-phase hybrid tide calculation method

The invention relates to a node current injection based single three-phase hybrid tide calculation method. The technical feature of the method is that the method includes steps of 1, constructing a single three-phase hybrid model used for power distribution network tide calculation; 2, performing power distribution network calculation by adopting a node current injection method based on the singlethree-phase hybrid model used for power distribution network tide calculation constructed in step 1. According to the invention, influence due to zero sequence and negative sequence components are taken into account, and calculation precision is ensured at the same time of ensuring the calculation speed.
Owner:ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO +2

A prce-based online identification method for low-frequency oscillation modes

The invention discloses a PRCE-based low-frequency oscillation mode online identification method, which belongs to the field of low-frequency oscillation of power systems. Including: first read the angular velocity measurement signals of multiple generators after a power system disturbance; then construct the Hankel matrix from the free oscillation signal, and then solve the column vector by the least square method; finally construct the matrix polynomial to solve the eigenvalue matrix and the right eigenvector Matrix, so as to obtain the oscillation frequency, damping ratio and oscillation mode of the system. The method of the present invention is based on multi-channel signals, can identify oscillation modes, and the identification results are more stable; compared with the TLS-ESPRIT method and the SSI method, the identification results of the method of the present invention are better in terms of identification accuracy and efficiency.
Owner:SOUTHWEST JIAOTONG UNIV

Biomechanical modeling method of subcutaneous adipose tissue based on linear elastic and hyperelastic models

InactiveCN106021977BVerify efficiencyAccuracy VerificationSystems biologySpecial data processing applicationsMechanical modelsBiomechanics
The invention relates to a biomechanics modeling method for subcutaneous adipose tissues based on linear elasticity and superelasticity models. According to the biomechanics modeling method, the problems that an existing subcutaneous adipose tissue model is low in simulation accuracy and speed are solved. The biomechanics modeling method comprises the following steps: (1) establishing a geometric model, and dividing grids; (2) establishing a linear elasticity biomechanics model; (3) establishing a superelasticity biomechanics model; (4) carrying out finite element simulation on the superelasticity biomechanics model according to the step (1) and the step (2); (5) carrying out finite element calculation on the linear elasticity model; and (6) carrying out finite element simulation on a mixed linear elasticity and superelasticity model. By virtue of comparison on a simulation result and an experimental result, the accuracy of the biomechanics modeling method is verified. By virtue of comparison on simulation time of the single linear model and superelasticity model, high efficiency of a simulation algorithm of the mixed linear elasticity and superelasticity model is verified. The biomechanics modeling method is applied to the field of biomedical engineering.
Owner:HARBIN UNIV OF SCI & TECH

A method for checking the fixed value of relay protection distance based on measured impedance

ActiveCN106385014BGuaranteed accuracyMeet the requirements for online verificationParameter calibration/settingOperation modeElectrical impedance
The invention discloses a relay protection distance setting value check method based on measured impedance, comprising the following steps: determining a line to be checked and setting fault points; obtaining the measured impedance of protection related to the line after a minimum short-circuit fault occurs to the fault points of the line, and comparing the measured impedance with the setting value of each section of protection to get the action result of each section of protection; testing the selectivity of protection according to the action result of each section of protection and the time setting value thereof; setting fault points at the head and tail ends of the line to be checked, and checking the sensitivity of protection according to the measured impedance of protection after the minimum short-circuit fault occurs to the fault points of the line; calculating the minimum load impedance under the current operation mode, and testing whether the setting value of section-III protection can avoid the minimum load impedance value; and selecting next line to be checked, and repeating the steps. Compared with the common method at present, the proposed scheme has certain advantages in speed of calculation and accuracy of the check result, and can be better used in distance setting value online checking of a large grid.
Owner:HUAZHONG UNIV OF SCI & TECH +1

Method for simulating and optimizing echo signal intensity of moving surface ship

The invention discloses a method for simulating and optimizing the echo signal intensity of a moving surface ship, which comprises the following steps of: establishing a three-dimensional ship body model below the water surface according to a ship model line graph, subdividing a triangular surface grid, solving a moving posture of the three-dimensional ship body model and a two-dimensional rough sea surface complex reflection coefficient in combination with different sea condition parameters, and according to the established four-path echo model of the water surface ship and four-path echo signals of the moving water surface ship, superposing the echo signal intensity of each path, and simulating the echo signal intensity of the moving water surface ship. The method disclosed by the invention has a remarkable advantage in calculation speed, and the average error between the theoretical simulation result and the actual measurement result of the echo signal intensity is less than 2dB, so that the echo signal intensity of the moving surface ship can be accurately and quickly simulated.
Owner:JIANGSU UNIV OF SCI & TECH

A 3D Adversarial Network Based Medical CT Image Segmentation Method

The invention discloses a medical CT image segmentation method based on a 3D confrontation network, comprising the following steps: collecting medical CT image samples, performing standardized preprocessing; establishing a final segmentation network; putting any given medical CT image to be identified into the final In the segmentation network, the final segmentation result is obtained. In the present invention, the structural form of the 3D confrontation network is designed as a whole, and the segmentation network is used as the generation network G of the 3D confrontation network, and the pre-trained VGG11 is used as the discrimination network D of the 3D confrontation network. The invention uses the confrontation network to increase the labeling data, and through similarity calculation and cyclic random screening, the credibility of the image is enhanced to generate high-quality labeling image collections in batches, and finally the segmentation is updated through the confrontation training of the discriminant network D and the segmentation network Network parameters and discriminant network D parameters, so as to optimize the segmentation network and improve the segmentation accuracy. The method of the invention is simple in design and easy to implement.
Owner:SHENZHEN INST OF FUTURE MEDIA TECH

Image fuzzy classification method applying image correlation

The invention discloses an image fuzzy classification method applying image correlation. The method comprises the steps of 1, for to-be-classified images, calculating fractal dimension characteristicsand energy characteristics of the images, and according to the values of the fractal dimension characteristics and the energy characteristics, classifying the images into three types; 2, marking thetotal image quantities in the three types of the images as n1, n2 and n3 respectively, calculating texture characteristic mean values of the characteristics of the three types of the images, and marking the texture characteristic mean values as mean1, mean2 and mean3 respectively; 3, calculating differences between each image and the texture characteristic values of the three types of the images;4, calculating the correlations between each image and the three types of the images; 5, calculating a mean value of the correlations of the three types of the images in the respective types; and 6, determining whether the images belong to the current type of the images or not.
Owner:句容沣润塑料制品有限公司

Object deformation control method based on connection relationship

The invention provides an object deformation control method based on a connection relationship. The method comprises the following steps: preprocessing: before transformation, solving a polygon closest to each connected domain of a control object and a controlled object at a binding position, storing the normal information of the binding position of the polygon, and recording the association relationship between the polygon on the control object and each connected domain of the controlled object at the same time; performing deformable animation, when teach object is controlled to deform; acquiring normal and position information of all polygons associated with all connected domains of the controlled object, then calculating a transformation matrix according to the normal and position information bound with the polygons, substituting the transformation matrix of each polygon into the vertex of each connected domain according to the associated information of the connected domains to acquire a final deformation result. According to the method, optimization is carried out for the problems that when model additional deformation operation is carried out, a traditional deformation tool isprone to distortion, parameter control is tedious, and the calculation speed is low.
Owner:江苏原力数字科技股份有限公司

Method for acquiring parameters of electric power harmonic waves by using Hanniing window function continuous frequency spectrum interpolation

The invention relates to a method for acquiring parameters of electric power harmonic waves by using Hanning window function continuous frequency spectrum interpolation, applicable to harmonic analysis and monitoring on voltage and current of a power network. Firstly, chirp Z transform (CZT) is utilized to accurately extract fundamental wave signal parameters (amplitude, frequency and phase) froman electric signal containing harmonic waves. Then the fundamental wave signal is subtracted from the analyzed electric signal and a Hanning window function is added to cut off the electric signal, and FFT (fast Fourier transformation) is utilized to calculate frequency spectrum of the residual signal. And then frequency values of all the harmonic waves are accurately calculated according to the frequency of a fundamental wave. And finally interpolation is carried out on the Hanning window function in the frequency domain according to each harmonic wave frequency, and the parameter of each electric power harmonic wave is accurately calculated. The method provided by the invention has estimated value accuracy basically equivalent to that of an addition Hanning window FFT bispectrum line interpolation fitting analysis method of electric power harmonic waves, and calculated amount of the method provided by the invention is about 1 / 2 of that of the addition Hanning window FFT bispectrum line interpolation fitting analysis method of electric power harmonic waves.
Owner:CHINA UNIV OF MINING & TECH
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