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60results about How to "Improve build precision" patented technology
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Human anatomic structure model and implant rapid forming method
ActiveCN105224759AHigh speedHigh precisionSpecial data processing applicationsAnatomical structuresStructure analysis
The present invention disclose a human anatomic structure model and implant rapid forming method. The method is characterized by comprising: firstly, obtaining three-dimensional digital models of an implant, an anatomic structure or parts and layers of the anatomic structure by software processing; secondly, performing inward or outward cavity, hollowing and thin wall processing on all or part of the models by the software to form an internal frame structure or add an internal tube cavity structure, thereby obtaining a printing model; thirdly, directly adding a supporting structure to a structure small in size and low in printing cost and performing printing; fourthly, performing 3D supporting structure analysis on a bulky, branch or netty structure, performing segmentation, printing the segmented model, and obtaining the model by assembling and bonding; and finally, further processing the model. According to the method provided by the present invention, the modeling precision can be improved, printing materials can be reduced, the costs and time are saved, and certain technological bottlenecks are avoided, so that the method is practical and easy to generalize.
Owner:佛山市三水区人民医院
Elastic migration seismic wave field construction method and elastic migration seismic wave field construction device
ActiveCN103149585AFew grid pointsImprove build precisionSeismic signal processingReverse timeSource function
The invention provides an elastic migration seismic wave field construction method and an elastic migration seismic wave field construction device. The method includes computing a finite difference coefficient of extended compact staggered grids according to an elastic wave velocity stress equation; computing a finite difference operator matrix of the extended compact staggered grids; constructing forward direction extrapolation operator of a seismic source wave field, and a reverse-time extrapolation operator of a detection wave field; achieving forward direction extrapolation of a seismic wave field to obtain the seismic source wave field according to the forward direction extrapolation operator of the seismic source wave field, a preset medium model and a preset seismic source function; and achieving reverse-time extrapolation of the seismic wave field to obtain the detection wave field according to the reverse-time extrapolation operator of the detection wave field, a preset medium model and preset multi-component seismic data. Compared with an existing method for constructing an elastic deflection seismic wave field by utilization of a conventional finite difference method and a compact difference method, the number of difference base frame grid points is reduced under the condition of same difference orders, the construction precision of a complex medium wave field can be effectively improved, and therefore the imaging precision of reverse-time migration is improved.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Three-dimensional full waveform inversion energy weighted gradient preprocessing method
ActiveCN106526674AVelocity Depth Accuracy ImprovementsImprove build precisionSeismic signal processingTime correlationPretreatment method
The invention relates a three-dimensional full waveform inversion energy weighted gradient preprocessing method. The method comprises the steps of (1) carrying out time second-order space finite difference method 3D forward simulation, storing a boundary wave field, and storing the maximum amplitude of reaching each speed grid point at the same time, (2) carrying out source wavefield reconstruction and residual wave field backward spreading at the same time, and carrying out corresponding time correlation to obtain a gradient, (3) reading the information stored in the step (1) and obtaining an energy weighted operator to carry out preprocessing of the gradient, and (4) obtaining the gradient operator of an appropriate step length action after preprocessing, and obtaining speed update quantity iterative update speed. According to the method, in the premise of not increasing computing amount, the problem of gradient operator deep and shallow layer energy imbalance caused by spherical wave spreading geometric diffusion and the like is solved, and the precision of deep layer speed imaging by full waveform inversion is improved effectively.
Owner:CHINA PETROLEUM & CHEM CORP +1
Unmanned reconnaissance aerial vehicle synchronous positioning and picture compositing method based on self-adaption EKF
InactiveCN105333869AGet rid of dependenceComplete efficientlyNavigational calculation instrumentsProcess noiseUncrewed vehicle
The invention belongs to the technical field of unmanned aerial vehicles, and particularly relates to an unmanned reconnaissance aerial vehicle synchronous positioning and picture compositing method based on a self-adaption EKF. By means of the method, a graph model, a coordinative system, a feature model, an unmanned reconnaissance aerial vehicle movement model and a sensor measurement model of an unmanned reconnaissance aerial vehicle synchronous positioning and picture compositing system are established. Synchronous positioning of the unmanned reconnaissance aerial vehicle and design of a map establishment method frame are achieved through the EKF. The problems that due to the establishment inaccuracy of the unmanned reconnaissance aerial vehicle movement model and an observation model and the linearization of non-linear models, the models are not matched are researched. The uncertainty caused by establishment inaccuracy and linearization errors of the models is modeled into process noise and observation noise of the system with a time-varying mean and a covariance matrix, and the synchronous positioning and picture compositing method based on the self-adaption EKF with a time-varying noise estimator is designed. Statistical features of the process noise and observation of the system are estimated in real time and modified, and therefore model uncertainty is reduced and the estimation progress is improved.
Owner:TIANJIN JINHANG COMP TECH RES INST
Shallow underwater topography construction method integrating hyper-spectral data and sparse sonar data
The invention relates to a shallow underwater topography construction method integrating hyper-spectral data and sparse sonar data and belongs to the technical field of underwater topography reconnaissance. According to the shallow underwater topography construction method, dimensions of a hyper-spectral remote sensing image are reduced by aid of a clustering center of sonar data, area division is performed on a low dimensional remote sensing image after dimension reducing, and interpolation is performed on sonar data inside each of the areas to obtain the underwater topography. According to the shallow underwater topography construction method, the hyper-spectral remote sensing image and sparse sonar data are organically combined, in the whole process, and two kinds of data compensate to solve the problem of underwater topography construction well. The remote sensing image and the sonar data are provided with coordinate information after geometric correction, and a certain fuzzy corresponding relation exists between a grayscale of the remote sensing image and the water depth, so that water depth in each depth homogeneous area changes slightly in area-divided remote sensing image, and interpolation results of sonar data are authentic.
Owner:NANJING UNIV
Medium-resolution remote sensing image discrete point DEM (Digital Elevation Model) construction method based on medium value filtering
InactiveCN102436679AHigh precisionImprove elevation accuracy3D modellingImage resolutionSatellite image
The invention belongs to the field of a medium-resolution remote sensing image discrete point DEM (Digital Elevation Model) construction method, which discloses a medium-resolution remote sensing image discrete point DEM construction method based on medium value filtering. The medium-resolution remote sensing image discrete point DEM construction method comprises the following steps of: 1. calculating tidal height information at a satellite imaging moment; 2. dispersing a vector waterline extracted at the satellite imaging moment; 3. combining equidistant tidal level points dispersed in the above steps, building the reference grid of the median filtering according to a remote sensing image resolution ratio, labeling all dispersed equidistant tidal level points, and marking the ID (Identity) of the grid to which the equidistant tidal level points belong; 4. traversing all grids; and 5. on the basis of a median filtering result, building a final DEM result by linear interpolation. In the method disclosed by the invention, the method of median filtering effectively utilizes the elevation information of all discrete points falling in the grids to improve the elevation precision of the discrete point.
Owner:NANJING UNIV
Urban ramp driving condition construction method and application
PendingCN111008505AMeet performance requirementsMeet the performance requirements of drivingDesign optimisation/simulationSystems engineeringPrincipal component analysis
The invention discloses an urban ramp driving condition construction method and application. The method comprises the steps: firstly, selecting an urban road containing a ramp as a test route and acquiring speed and slope angle information on the test route; preprocessing the acquired data to obtain effective data, then performing short-stroke division and principal component analysis according tothe effective data, performing short-stroke clustering analysis by adopting an SOM neural network according to a principal component analysis result, screening short strokes according to a clusteringanalysis result, and finally combining the selected short strokes to form an urban ramp driving condition meeting requirements. The related parameters of the ramp are listed into the short-stroke characteristic parameters, and the urban ramp information is contained in the constructed driving working condition so that the constructed driving working condition contains urban ramp driving characteristics and can meet the requirements of an automobile urban ramp driving performance test and can be used as a reference working condition of the automobile urban ramp driving performance test in an automobile bench performance experiment and a performance simulation experiment.
Owner:XIHUA UNIV
Method for synchronously obtaining electric signals of any two ends of power transmission line
ActiveCN102955095AEliminate the effects of transmission delay assumptionsAccurate calculationCurrent/voltage measurementFault locationPower flowEngineering
The invention provides a method for synchronously obtaining electric signals of any two ends of a power transmission line. The method comprises the following steps of: collecting electric signals uM(t), iM(t), uN(t') and iN(t') of head and tail ports of the power transmission line; calculating a current calculation value iNj(t) of the tail end of the power transmission line at a t moment by voltage and current collection sequences uM(t) and iM(t) at the front end of the power transmission line according to a power transmission line distribution parameter circuit model; calculating a collection time deviation (t-t') of the two ends of the power transmission line according to the current calculation value iNj(t) of the tail end of the power transmission line at the t moment and a collection current sequence iN(t') of the tail end of the power transmission line at a t' moment; and judging whether a collection moment t' of the tail end of the power transmission line is adjusted or not by comparing with a collection time deviation adjusting setting value delta tset. Circularly, the synchronous collection of the electric signals of any two ends of the power transmission line is realized. The method disclosed by the invention eliminates the influences of inconsistency of transmission delay of a data channel of the power transmission line on synchronous collection of the electric signals; and a time block standard signal except for an electric power system does not need to be introduced so that the microsecond-grade synchronous collection precision of the power transmission line can be realized.
Owner:CHONGQING UNIV +2
Construction method of electromagnetic spectrum map
ActiveCN110445567AImprove build efficiencyExcellent construction accuracyTransmission monitoringMethod of undetermined coefficientsAffinity propagation clustering
The invention provides a method for constructing an electromagnetic spectrum map, which comprises the following steps of defining the spatial similarity between any two sensors by using a negative square distance, and updating an attraction degree matrix and an affiliation degree matrix through an iterative process so as to determine the clustering center of the sensors; kriging estimation groupsof different unknown points are established through classes of sensors; calculating an experimental variation function for different Kriging estimation groups, fitting theoretical variation functionsin the different Kriging estimation groups, calculating common Kriging weights of measured values of all sensing points in the Kriging estimation groups, and further calculating common Kriging estimated values; repeating the above steps for many times to estimate the observation value of any position where no sensor is arranged in the area, thereby obtaining the distribution condition of the observation value in the whole area, and achieving the construction of an electromagnetic spectrum map. According to the method, affinity propagation clustering is applied to randomly arranged sensor clustering, so that the electromagnetic spectrum map construction precision and construction efficiency are greatly improved.
Owner:NAT UNIV OF DEFENSE TECH
Electromagnetic spectrum map construction method based on ordinary kriging interpolation
ActiveCN110346654AImprove build precisionReduce in quantitySpectral/fourier analysisElectromagentic field characteristicsSpatial correlationFrequency spectrum
The invention belongs to the field of electromagnetic spectrum monitoring, and relates to an electromagnetic spectrum map construction method based on ordinary kriging interpolation. The electromagnetic spectrum map construction method based on ordinary kriging interpolation comprises the steps of: (1), calculating an experimental variation function according to an observation value obtained by asensor; (2), fitting the value of the experimental variation function on discrete h; (3), calculating the ordinary kriging weight and the lagrangian multiplier at the position s<o>; (4), calculating an observation value at the position s<o> without the sensor; and (5), repeating the step (1) to the step (4) till an observation value at any position without the sensor in an area is estimated, wherein the distribution condition of the observation values in the whole area is obtained; and electromagnetic spectrum map construction is completed. By means of the electromagnetic spectrum map construction method provided by the invention, a relatively high-precision electromagnetic spectrum map construction result can be obtained under the conditions of the same sensor number and deployment by utilization of the spatial correlation of monitoring data.
Owner:NAT UNIV OF DEFENSE TECH
Electromagnetic spectrum map construction method and device, computer equipment and storage medium
ActiveCN112698112AImprove build precisionBuild fastCharacter and pattern recognitionElectromagentic field characteristicsPrior informationElectromagnetic spectrum
The invention relates to an electromagnetic spectrum map construction method and device, computer equipment and a storage medium. The method comprises the following steps: acquiring monitoring data and a to-be-estimated point position, and acquiring path attenuation component estimation by using a trend surface fitting algorithm; subtracting the monitoring data from the path attenuation component estimation value of the corresponding position, performing position clustering on the obtained residual monitoring data, and estimating a clustering result in an optimal neighborhood by adopting a Kriging method to obtain shadow fading component estimation; and obtaining an estimation result according to the path attenuation component and the shadow fading component. Electromagnetic spectrum map construction is decomposed into estimation of path attenuation and shadow fading components, so that the electromagnetic spectrum map construction precision is effectively improved; through monitoring data clustering and optimal neighborhood selection, the calculated amount is reduced under the condition of ensuring the construction precision, and the electromagnetic spectrum map construction speed is effectively improved; and the method does not need prior information such as a radiation source and a propagation model, and has good adaptability.
Owner:NAT UNIV OF DEFENSE TECH
Mobile robot synchronous positioning and map building method
PendingCN110895146AImprove position estimation accuracyImprove estimation accuracyNavigational calculation instrumentsElectromagnetic wave reradiationState predictionEngineering
The invention provides a mobile robot synchronous positioning and map construction method which comprises the following steps: (1) establishment of system models including a robot motion model, an observation model and an environmental characteristic model; conversion of the colored process noise model into a white Gaussian noise model; (2) setting of initial parameters of a mobile robot synchronous positioning and map building algorithm, wherein the initial parameters comprise dead reckoning system parameters and laser radar parameters; (3) state prediction; (4) observing; (5) data association; (6) updating; and (7) state augmentation. The method is characterized by comprising the step (6), in the measurement updating process of standard volume Kalman filtering, an adaptive factor is selected, an autocorrelation covariance matrix and a cross-correlation covariance matrix are adaptively adjusted, the updating process is completed, and meanwhile, the weight ratio between system model prediction information and measurement information can be balanced, so that the positioning precision and the map construction precision are improved.
Owner:SHANDONG UNIV OF TECH
Skin crushed surface reconstruction method based on characteristics
ActiveCN104407567AIntegrity guaranteedImprove integrityNumerical controlNumerical controlMirror image
The invention discloses a skin crushed surface reconstruction method based on characteristics. The method comprises the steps that searching is performed firstly according to the selected technological curved surfaces so that a combined curved surface is acquired; then external contour line of the combined curved surface is extracted and fitting is performed the contour line; a guide line is automatically established according to the complete contour line, and the curved surface is formed via fitting; and whether the curved surface meets the precision requirement is judged, and the curved surface is expanded and extended if the curved surface meets the precision requirement and an expansion surface is established. If precision cannot meet the requirement, precision is doubled and the expansion surface is established again. The expansion surface is cut by the complete contour line, and the maintained curved surface is the reconstructed curved surface. The complete curved surface completely overlapped with the original technological curved surface is reconstructed by the method by aiming at the skin component crushed curved surface, and the complete fitting boundary is obtained so that fitting precision is high, skin mirror image milling numerical control programming can be directly used, processing time is saved, processing efficiency is enhanced and the processing process is enabled to be more stable.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Dense height map construction method suitable for leg-foot robot planning
ActiveCN111596665AEasy to planEasy to handlePosition/course control in two dimensionsRobot planningHeight map
The invention discloses a dense height map construction method, and belongs to the technical field of dense height map construction. The construction method specifically comprises the following steps:using the Gaussian distribution model to estimate the measurement value of the laser radar, and mapping the same to corresponding grids of a local map so as to perform multi-frame data fusion; updating map grid covariance according to the robot pose information, correspondingly moving the local map, and clearing dynamic obstacles so as to form a complete local dense map. The method overcomes thedefects that an existing dense map is large in data size, large in construction calculation amount and not timely in updating, has the advantages of being convenient to construct, high in constructionprecision and the like, can complete real-time construction, and can be directly used for navigation tasks of the legged robot.
Owner:ZHEJIANG UNIV
Method and device for constructing semantic position history
ActiveCN106840165ASolve operational problemsSolve technical problems that consume a lot of manpower and material resourcesNavigational calculation instrumentsMaterial resourcesData mining
The invention discloses a method and a device for constructing a semantic position history. The method at least comprises the following steps: expanding a certain region outwards based on coordinates of interest points, so as to form an original interaction region; acquiring a moving track of a user; screening staying points in the original interaction region from the moving track according to a construction condition; and assigning semantic information of the interest points corresponding to the staying points to the staying points on the moving track, so as to obtain the semantic position history. Compared with the prior art, the method has the advantages that the manual operation is omitted, or additional equipment does not need to be mounted, so that the technical problems the manual operation is required, and a large number of manpower and material resources are consumed in the prior art are solved, the time and the labor are saved, and the construction precision is further improved.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)
Systems and methods for automated identification of surfaces for building of geologic hydrodynamic model of oil and gas deposit by seismic data
ActiveUS20140156245A1Improve build precisionSeismic signal processingAnalogue processes for specific applicationsMedia designComputerized system
The invention generally relates to methods of modeling and building models of oil-and-gas deposits. More particularly, the invention relates to a computer-implemented method, a computerized system, and a computer-readable medium designed for automated identification of surfaces for building a geologic-hydrodynamic model of an oil and gas deposit based on seismic data. A technical result is the improvement of the accuracy of building a geological-hydrodynamic model of an oil-and-gas deposit. The objective of embodiments of the invention is to provide a method, device, and a non-transitory computer-readable medium designed for the implementation of stages accounting for a considerable part of the entire problem of building a geological-hydrodynamic model, namely, automated (that is, requiring the user to participate only in the stage of initial data input) building of a set of surfaces based on input seismic data. The output surfaces can be used, without additional processing, to construct a geological-hydrodynamic grid.
Owner:OOO ROCK FLOW DYNAMICS
Method for determining q-axis current compensation value of permanent magnet synchronous motor and pulsation suppression metho
ActiveCN110880895AAvoid time lagAccurate calculationTorque ripple controlAC motor controlFast Fourier transformTime domain
The invention discloses a method for determining a q-axis current compensation value of a permanent magnet synchronous motor and a pulsation suppression method. The method comprises the following steps: synchronously acquiring a q-axis current feedback signal iq and a rotor position signal theta m, determining a position interval of a rotor based on the theta m, accumulating the interval times by1 and performing synchronous averaging on the iq, and repeatedly acquiring until the accumulated value of the interval times is greater than a threshold value and all the intervals are not overlappedto form a circle of the rotor; performing fast Fourier transform on the synchronous average value corresponding to each interval arranged in sequence to obtain frequency domain characteristic information, determining the amplitude and the phase angle of a to-be-compensated spatial frequency component from the frequency characteristic information, and constructing a q-axis current compensation function; and obtaining a q-axis current compensation value based on the position of the actual compensation moment of the motor rotor and the current compensation function. Time domain information is converted into a space domain, time lag is avoided, the whole process does not affect the dynamic performance of the system, extra devices are not needed, structures and parameters of all control links do not need to be adjusted, and operation is easy.
Owner:HUAZHONG UNIV OF SCI & TECH
Discrete manufacturing workshop digital twin model adaptive dynamic updating method
PendingCN114398049AAddress performance degradationImprove build precisionSoftware deploymentCorrection algorithmData set
The invention discloses an adaptive dynamic updating method for a digital twinborn model of a discrete manufacturing workshop, which comprises the following steps of: firstly, acquiring data of a virtual workshop and an actual workshop, selecting a characteristic data set, respectively calculating a precision error of a true value of a performance index and a theoretical value predicted by the model, and then, carrying out adaptive dynamic updating on the digital twinborn model of the discrete manufacturing workshop based on a Mann-Kendall precision error trend analysis method. Taking the result as a triggering condition for dynamic correction of the twin model; then, DNN and LSTM are selected as base learners, continuous iterative training is carried out by adopting an integrated learning method, a weight updating mode of the base learners is improved from two perspectives of data importance and performance importance, a twinborn model dynamic correction algorithm based on Adaboost-DNN-LSTM is formed, and dynamic correction of the twinborn model is completed by adopting a difference base learner optimization method. The digital twinning model adaptive dynamic updating method provided by the invention provides a model updating method for accurate application of digital twinning of a discrete manufacturing system, and has an important value for improving the workshop production management and control intelligence level.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Topmark map building and robot positioning method
PendingCN109612468AReduce accumulationImprove build precisionNavigational calculation instrumentsAutomatic controlTransition matrices
The invention belongs to the technical field of automatic control, and provides a topmark map building and robot positioning method. The topmark map building and robot positioning method comprises thesteps: S1, whether a positioning mode is entered currently or not is judged, if yes, the positioning mode is entered, the step S2, the step S3 and the step S4 are executed, and if not, a mapping modeis entered, and the step S2 to the step S6 are executed; S2, topmarks in a current map are extracted, ID of the topmarks is obtained, and the positions of the topmarks in the map are calculated; S3,the known and unknown topmarks in the current map are extracted; S4, the pose of a robot in the current road sign map is calculated based on the three or more known topmarks; S5, a transition matrix R' and a translation vector t' from a topmark coordinate system to a map coordinate system are calculated; and S6, coordinates x<w> of the unknown topmarks in the road sign map are calculated based oncoordinates x<map> of the unknown topmarks in the topmark coordinate system, and the road sign map is updated. Positions of the unknown topmarks in the road sign map are calculated based on the transition matrix and the translation vector from the current topmark coordinate system to the map coordinate system, that is, the road sign map is built, and accumulation of errors can be weakened.
Owner:WUHU HIT ROBOT TECH RES INST
Automatic library book taking and placing robot based on ROS
PendingCN113084777AImprove fusion efficiencyImprove build precisionProgramme-controlled manipulatorPublic placeMaterial resources
The invention relates to an automatic library book taking and placing robot based on an ROS. The automatic library book taking and placing robot comprises a movable chassis, a lifting platform, a grabbing device, a multi-grid storage box, a touch screen and a power supply unit. The lifting platform, the multi-grid storage box, the touch screen and the power supply unit are all arranged on the movable chassis, and the grabbing device is arranged on the lifting platform. The power supply unit is in circuit connection with the movable chassis, the lifting platform, the grabbing device, the multi-grid storage box and the touch screen. The robot can create a map in a library, conduct automatic navigation and grab and place targets on all bookshelf layers, manpower and material resources needed by workers for placing books are saved, needed books are automatically found for readers and given to the readers, the time consumed for searching for books is shortened, the reading experience is enhanced, the contact between people in the public place is effectively reduced, and the probability of epidemic disease infection is reduced.
Owner:JIANGXI NORMAL UNIVERSITY
Space tangent vector-based power system static-state voltage stability domain boundary approximation method
ActiveCN108493931AImprove build precisionImprove build efficiencyAc network circuit arrangementsSaddle-node bifurcationPower flow
The invention discloses a space tangent vector-based power system static-state voltage stability domain boundary approximation method. The method comprises the following steps of taking ground state power flow as the starting point, adopting a continuous power flow method to search a series of power system saddle-node bifurcation points and tangent vectors thereof, and obtaining boundary points inan active power injection space of a static-state voltage stable domain, namely the saddle-node bifurcation points; based on the space tangent vectors, primarily dividing the static-state voltage stable domain formed by the boundary points into several regions, and calculating the distances from the boundary points to corresponding line sections through a method of bisection, and obtaining a two-dimensional approximation boundary which satisfies certain distance error threshold value requirements; and on the basis of the two-dimensional approximation boundary, establishing a three-dimensionalapproximation boundary according to a triangular establishment principle, then obtaining a triangular approximate plane equation, calculating the maximum distance error from all SNB points in the approximate region corresponding to S triangular approximate planes to the plane, and when the error threshold value is satisfied, completing approximation to obtain a three-dimensional SVSR triangular approximate boundary.
Owner:NORTHEAST DIANLI UNIVERSITY
Capillary pressure curve construction method and device
PendingCN111597764AImprove build precisionHigh precisionDesign optimisation/simulationRock corePressure curve
The invention relates to the technical field of oil and gas reservoirs, and discloses a capillary pressure curve construction method and device and a computer storage medium. The method comprises thefollowing steps: according to the displacement effect of air in core pores on fluid in the centrifugal process, calculating the centrifugal radius and the length of a fluid area, and calculating capillary pressure in different displacement states in the centrifugal process according to the centrifugal radius and the length of the fluid area; calculating the average capillary pressure of the core pores in different displacement states according to the capillary pressure in different displacement states; calculating an average capillary pressure formula of the rock core in different displacementstates in combination with the average capillary pressure of the rock core pores in different displacement states; and obtaining the water saturation in the rock core sample detected by the centrifugal experiment, and constructing a rock core capillary pressure curve in combination with an average capillary pressure formula of the rock core. According to the method and device, the displacement effect of air on the fluid is considered when the capillary pressure in the centrifugal process is calculated, and the constructed capillary pressure curve is higher in precision.
Owner:YANGTZE UNIVERSITY
Method and device for constructing elastic migration seismic wave field
ActiveCN103149585BFew grid pointsImprove build precisionSeismic signal processingReverse timeWave field
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Construction method of load spectrum of electric automobile speed reducer
ActiveCN113255081AImprove build precisionEnsure consistencyGeometric CADDesign optimisation/simulationLoad spectrumBench test
The invention relates to the technical field of automobiles, and particularly discloses a construction method of a load spectrum of an electric automobile speed reducer. The method comprises the following steps: acquiring total pseudo damage D corresponding to an existing load spectrum according to a load coefficient and a torque threshold value of the speed reducer, the maximum design torque Mmax of an input shaft of the speed reducer in the existing load spectrum and other parameter values corresponding to the speed reducer in the existing load spectrum; comparing the total pseudo-damage D corresponding to different existing load spectrums, and determining the basic load spectrum for constructing the new load spectrum, thereby solving the problem that the total pseudo-damage D is not associated with the structure of the speed reducer, enabling the determined total pseudo-damage D to truly reflect the load spectrum intensity of the applicable speed reducer, improving the construction precision of the basic load spectrum, improving the construction precision of the new load spectrum, achieving the effective prediction of the user use condition of the newly developed speed reducer, and ensuring the consistency of the speed reducer bench test and the user test result; moreover, the cost is low, and the period is short.
Owner:CHINA FIRST AUTOMOBILE
Three-dimensional reconstruction method based on point-line feature fusion and electronic equipment
ActiveCN114170366AImprove stabilityImprove efficiency3D-image rendering3D modellingPattern recognitionImaging processing
The invention discloses a three-dimensional reconstruction method based on point-line feature fusion and electronic equipment, and relates to the technical field of image processing, and the method comprises the steps that the electronic equipment can obtain a plurality of images including an object 1, and the plurality of images can be called an image set; each image in the set of images may display an object 1 in different states (e.g., angle, orientation, time, illumination, etc.). The electronic equipment can extract feature points (also called point features) and feature lines (also called line features) from the image set through a specified algorithm, and then the electronic equipment can match the feature points and the feature lines extracted between every two images in the image set. And a three-dimensional model of the object 1 is constructed based on the feature points and the feature lines with the established matching relationship.
Owner:HONOR DEVICE CO LTD
Label identification method and device, computer equipment and storage medium
PendingCN114495044AImprove build precisionRealize accurate identificationScene recognitionNeural learning methodsPattern recognitionEngineering
The invention provides a label identification method and apparatus, a computer device and a storage medium. The method comprises the steps of obtaining a to-be-detected image; based on a trained label identification detection model, performing label identification detection on the to-be-detected image to obtain a label identification in the to-be-detected image; obtaining a label image in the to-be-detected image according to the label identifier, and processing the label image to obtain a processed label image; based on a sign information identification model, sign information identification is carried out on the processed sign image, sign information in the to-be-detected image is obtained, and the sign information comprises a road number and a course value. By adopting the method, the identification accuracy of the sign can be improved, so that more accurate road numbers and history values can be obtained, the sign information of the road can be perfected, the construction precision of the map can be improved, and the labor cost can be saved.
Owner:SF TECH
Data construction method based on seismic feature transformation space
ActiveCN108387928AImprove build precisionMeet the transformation needsSeismic signal processingComputer scienceRate of convergence
The present invention provides a data construction method based on a seismic feature transformation space. The method comprises steps of: Step 1: inputting seismic data that needs to be reconstructed;Step 2: analyzing characteristics of the input seismic data, and determining an effective feature transformation space according to the analysis result; Step 3: performing feature sparse expression on the seismic data according to the feature transformation space by using the corresponding feature transformation; Step 4: performing data construction processing method initialization; Step 5: determining the threshold of each iteration; and Step 6: performing data construction algorithm iterative calculation. The data construction method based on the seismic feature transformation space can automatically select a reasonable and effective feature transformation space according to the geophysical information contained in the actual seismic data itself, and has the adaptability; the method canmeet the transformation requirements of different seismic data, and better realize the sparse expression of the earthquake signal in the feature transformation space; and the method is fast in iterative convergence speed, high in computational efficiency, and high in data construction accuracy.
Owner:CHINA PETROLEUM & CHEM CORP +1
Feature-based Skin Fragmentation Reconstruction Method
ActiveCN104407567BIntegrity guaranteedImprove integrityNumerical controlNumerical controlSkin surface
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Electromagnetic spectrum map construction method, device, computer equipment and storage medium
ActiveCN112698112BImprove build precisionBuild fastCharacter and pattern recognitionElectromagentic field characteristicsEngineeringFitting algorithm
The present application relates to a method, device, computer equipment and storage medium for constructing an electromagnetic spectrum map. The method includes obtaining monitoring data and the position of the point to be estimated, using a trend surface fitting algorithm to obtain an estimate of the path attenuation component; making a difference between the monitoring data and the estimated value of the path attenuation component at the corresponding position, and performing a position analysis on the obtained residual monitoring data Clustering, the clustering results are estimated in the optimal neighborhood by kriging method, and the shadow fading component estimation is obtained; according to the path attenuation component and the shadow fading component, the estimation result is obtained. The construction of the electromagnetic spectrum map is decomposed into the estimation of path attenuation and shadow fading components, which effectively improves the construction accuracy of the electromagnetic spectrum map; through monitoring data clustering and optimal neighborhood selection, the calculation amount is reduced under the condition of ensuring the construction accuracy, and the construction accuracy is effectively improved. The construction speed of the electromagnetic spectrum map; this method does not require prior information such as radiation sources and propagation models, and has good adaptability.
Owner:NAT UNIV OF DEFENSE TECH
Method for constructing comprehensive working condition vibration spectrum of armored vehicle and method for constructing long-life test spectrum of armored vehicle
ActiveCN113094816AImprove build precisionImprove accuracyGeometric CADSustainable transportationVibration spectraNerve network
The invention discloses a method for constructing a comprehensive working condition vibration spectrum of an armored vehicle and a method for constructing a long-life test spectrum of an armored vehicle, and relates to the field of data processing method. The method for constructing the comprehensive working condition vibration spectrum comprises the steps: obtaining a first relation and a second relation among a single working condition actual measurement spectrum, a first reserve coefficient and the comprehensive working condition actual measurement spectrum; obtaining the relation between the first reserve coefficient and the comprehensive working condition actual measurement spectrum according to the first relation and the second relation; training a first RBF neural network to obtain a current first reserve coefficient; obtaining a first relation and a second relation among the single working condition standard spectrum, the second reserve coefficient and the comprehensive working condition standard spectrum; obtaining the relation between the second reserve coefficient and the comprehensive working condition standard spectrum according to the first relation and the second relation; training a second RBF neural network to obtain a current second reserve coefficient; and obtaining a reserve coefficient according to the current first and second reserve coefficients, thereby obtaining an actual comprehensive working condition actual measurement spectrum and a standard spectrum. According to the invention, the accuracy is improved, and a real vibration environment can be simulated more effectively.
Owner:UNIT 63966 OF PLA
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