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61 results about "Mesh optimization" patented technology
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Tetrahedral mesh generation method and device for three-dimensional solid model
ActiveCN104063903AGenerate efficientlyGeometric Boundary Feature Preservation3D modellingComputer graphics (images)Tetrahedral mesh generation
The invention provides a tetrahedral mesh generation method and device for a three-dimensional solid model. The method comprises the steps that coarse sampling is carried out on the solid model boundary, an initial tetrahedral mesh is built based on sampling points, and the corresponding relation between solid model information and initial tetrahedral mesh information is built; parallel domain partition is carried out; mesh subdivision and mesh optimization are carried out on parted areas in parallel, wherein the mesh optimization is used for keeping the model boundary according to the solid model information; sub-area meshes are combined into a whole mesh. According to the tetrahedral mesh generation method and device, coarse sampling is carried out in the model boundary sampling stage, and three-dimensional model information is brought in the tetrahedral mesh generation process, so that geometric boundary characteristics of the model is dynamically recovered in the parallel process, and model boundary sampling can be efficiently achieved; due to the fact that mesh subdivision and mesh optimization are carried out in the follow-up parallel process, the model boundary characteristics can be kept, and meanwhile the tetrahedral mesh is efficiently generated.
Owner:TSINGHUA UNIV
Method and system for constructing personalized avatars using a parameterized deformable mesh
A method and apparatus for generating a 3D personalized mesh of a person from a depth camera image for medical imaging scan planning is disclosed. A depth camera image of a subject is converted to a 3D point cloud. A plurality of anatomical landmarks are detected in the 3D point cloud. A 3D avatar mesh is initialized by aligning a template mesh to the 3D point cloud based on the detected anatomical landmarks. A personalized 3D avatar mesh of the subject is generated by optimizing the 3D avatar mesh using a trained parametric deformable model (PDM). The optimization is subject to constraints that take into account clothing worn by the subject and the presence of a table on which the subject in lying.
Owner:SIEMENS HEALTHCARE GMBH
Dynamic grid optimization-based LOF (Local Outlier Factor) clustering data anomaly point detection method and detection system
InactiveCN107256237AWide range of applicationsReduce computing timeRelational databasesSpecial data processing applicationsLocal outlier factorData space
The invention discloses a dynamic grid optimization-based LOF (Local Outlier Factor) clustering data anomaly point detection method and detection system. The detection method comprises the following steps: 1, obtaining an optimal unit grid vector Mopt according to an initial unit grid vector M0 and a growth vector delta p; 2, dividing data space into a dense region Rd, a sparse region Rs and a transition region Rt according to the optimal unit grid vector Mopt; 3. dividing all grids in the transition region Rt, which is obtained in the step 2, into dense region grids G'd and sparse region grids G's according to grid periphery density ratio vectors F, and adding the sparse region grids G's into the sparse region Rs to form a sparse region Regions of the data space; and 4, applying an LOF algorithm to detect anomaly points of the sparse region Regions of the data space. According to the method, the operation data amount of the LOF algorithm is reduced through the dynamic grids, and the computation time of the LOF algorithm is greatly reduced.
Owner:THE 28TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
Full mesh optimization for spanning tree protocol
ActiveUS20130111048A1Multiplex system selection arrangementsMultiple digital computer combinationsTraffic capacityMesh optimization
An optimized spanning tree protocol (OSTP) minimizes latency and provides high throughput in a full-mesh portion of a network, and is compatible with external networks where a standard spanning tree protocol is used. The OSTP enables traffic traversing the full-mesh portion to take a shortest path from source to destination through use of full-mesh connectivity. In some embodiments, a cluster includes a plurality of servers connected in a full mesh, and the OSTP is used on internal ports of the servers. In some embodiments, the OSTP is configured on a per-VLAN basis. In some embodiments, the servers exchange special messages enabling determination of full-mesh connectivity. In further embodiments, sending of the special messages is suppressed on certain port types, such as external ports. In some embodiments, determination of the full-mesh connectivity disables use of a standard spanning tree protocol and / or enables use of OSTP on the full-mesh portion.
Owner:ORACLE INT CORP
Optical-field-camera-based realization method for three-dimensional scene recording and broadcasting
InactiveCN105791881ARealize free transformationAdjust rendering distanceSelective content distributionSteroscopic systemsData synchronizationPoint cloud
The invention discloses an optical-field-camera-based realization method for three-dimensional scene recording and broadcasting. A plurality of optical-field cameras with multiple angles collect optical field information simultaneously; a main control computer collects the information and converts the optical field information into depth point clouds with RGB colors; the main control computer carries out synchronous fusion on data of the multiple optical-field cameras to reconstruct dynamic 3D scene data, wherein the data are scenes described in a point cloud mode; the main control computer carries out mesh optimization on the point cloud data to obtain a 3D model and chartlet information; the main control computer transmits the 3D model data to a user client; and user client software constructs a virtual 3D scene based on the data and carries out rendering. According to the invention, the main control computer collects the information and converts the optical field information into the depth point cloud data with the RGB colors to realize 3D scene reconstruction and then the virtual camera carries out 3D scene rendering again. Therefore, free changing at any angle is realized; and a rendering distance and an illumination direction can be adjusted.
Owner:SHENZHEN LIMBOWORKS TECH CO LTD
Frequency domain optimization mixture staggered grid finite difference forward modeling method
InactiveCN103823239AHigh precisionReduce anisotropySeismic signal processingFourier transform on finite groupsMesh optimization
Owner:中国石油集团西北地质研究所有限公司
Iteration interpolation method based on face triangle mesh adaptive subdivision and Gauss wavelet
InactiveCN105678252AAvoid the disadvantages of not being able to storeAvoid the disadvantages of low authenticity and the inability to store the data point cloud structureThree-dimensional object recognitionTriangulationMesh optimization
The invention discloses an iteration interpolation method based on face triangle mesh adaptive subdivision and Gauss wavelet. First, performing triangulation to a face model through a mesh optimized face subdivision method to obtain an optimal triangle; determining whether a spatial triangle is intersected or not, calculating depth information of an interpolation point through a two-dimension Gauss wavelet function on the basis of status of three vertexes of the spatial triangle to obtain a complete three-dimension coordinate of the interpolation point; obtaining the two-dimension coordinate (x, y) of the interpolation point, after finishing determining the two-dimension coordinate (x, y) of the interpolation point, performing recovery to a z axis of the interpolation point through the two-dimension Gauss wavelet function; determining the value of the interpolation point at the z axis and determining the optimal value of m according to the three vertexes of x, y, and z. The beneficial effects of the invention are: failure in shaping a recognizable three-dimension face model due to insufficient three-dimension characteristic points is effectively avoided, and modeling effect is impressive.
Owner:ANYANG NORMAL UNIV
Fixed node discharge curve approximation and curved surface mesh generation optimizing technology
InactiveCN102831648AMaintain surface shapeAnti-aliased malformed mesh3D modellingEngineeringMesh optimization
The invention relates to a fixed node discharge curve approximation and curved surface mesh generation optimizing technology which obviously improves the quality of a curved surface mesh and can be applied to the boundary discrete optimization and visualization technology when generating a body-fitted mesh. The technology comprises the following steps of: (1.1) establishing a curved surface model by a computer according to the curved surface to be analyzed, and determining the curved surface boundary, shape, mesh number and mesh step; (1.2) projecting the curved surface to a plane, generating a two-dimensional body-fitted mesh according to the projection area, and projecting the body-fitted mesh to the original curved surface; (1.3) optimizing the boundary node of the curved surface mesh according to the length maximization rule; (1.4) optimizing the internal node of the curved surface mesh according to the area maximization rule; and (1.5) optimizing the mesh step according to the optimization algorithm defining the mesh step, and finally generating a high-quality curved surface mesh. The technology provided by the invention realizes the boundary discrete optimization in generation of a body-fitted mesh of a complicated boundary as well as the mesh optimization in the visualization technology.
Owner:邢学军
Manufacturing method of individual hip joint percutaneous puncture guide plate
InactiveCN105796160AReduce radiation doseAccurate guidanceAdditive manufacturing apparatusSurgical needlesSkin surfaceModeling software
The invention discloses a manufacturing method of an individual hip joint percutaneous puncture guide plate. The manufacturing method comprises the following steps that 1, a three-dimensional geometric model is built, wherein thin-layer chromatographic scanning data of the hip joint of a patient is obtained, and three-dimensional models of skeleton, soft tissue, skin and important blood vessels are built and exported and stored in a stl format; 2, a puncture channel is determined, wherein in modeling software, a puncture target point and the needle entering direction and angle are determined, the puncturing needle form is extracted, a puncture channel is formed through fitting, and then the puncture channel is reversely prolonged to puncture out of skin to form a body surface marker to be exported and stored in an stl format; 3, the guide plate is designed, wherein in software, mesh optimization is carried out on the three-dimensional models of skeleton, soft tissue, skin and important blood vessels, a skin surface mesh is extracted, reverse offset thickening is performed to form a guide plate panel, a bone mark is marked, and the guide plate panel is in fit with the reverse puncture channel to obtain a guide plate model; 4, a guide plate entity is obtained through 3D printing. The manufacturing method has the advantages of being individual, accurate, rapid, low in cost and efficient.
Owner:GUIZHOU NORMAL UNIVERSITY +1
Simulation method for funnel breast orthopaedic surgery
InactiveCN101488236AIncrease success rateInternal osteosythesisDiagnostic recording/measuringMechanical modelsElement analysis
The invention discloses a funnel chest orthopaedic surgery simulation method; chest three-dimension visualization bone models and costal cartilage models are respectively processed by face mesh division, and the mesh is optimized; a mesh conversion is used on the basis of mesh optimization, and a chest model is converted into a body mesh from a face mesh; rib, costal cartilage and breast bone are respectively material-evaluated, and skeleton body mesh model of each part is assembled so as to obtain a complete chest three-dimensional mechanical model; boundary conditions and loading force moment are determined, and the chest model is processed by finite element analysis so as to obtain the stress, strain and displacement conditions of each skeleton part under the action of different external forces; the incision position, support plate material, fixing method and supporting force moment of funnel chest surgery are simulated so that the success ratio of funnel chest surgery is increased to over 98% from 70-90% of the prior art.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Method, device and system for optimizing performance of cardiac valve prosthesis
InactiveCN106845020AImprove performanceReduce gapImage enhancementImage analysisStress distributionElement analysis
The invention relates to a method, a device and a system for optimizing performance of a cardiac valve prosthesis. The method comprises steps as follows: a cardiac valve image acquired through a scanning device is obtained; an aorta section model is extracted from the cardiac valve image; a primary valve model is obtained through mesh optimization; an artery is established, and an artery blood model is obtained; a solid valve model and a solid arterial wall model are obtained through model optimization; a cardiac valve prosthesis design result is obtained through finite element analysis. A finite element method is combined with biological science, and the difference between the cardiac valve prosthesis and a natural cardiac valve is narrowed by using a real body scan image to re-establish a biovalve model. The re-established model is subjected to materialized processing, key features of valve appearance are extracted, the model is subjected to secondary reestablishment, and a three-dimensional model closer to the reality is obtained. The model can present the appearance of the cardiac valve prosthesis really and can also perform finite element analysis on the stress distribution of the valve impacted by blood, and accordingly, the performance of the cardiac valve prosthesis is improved.
Owner:SHANDONG UNIV
High-quality meshing and optimization method applied to cutting of virtual surgery
The invention provides a high-quality meshing and optimization method applied to the cutting of a virtual surgery. The novel meshing and optimization method is provided to solve the problem of partialcutting in the cutting operation of the virtual surgery and instable simulation caused by poor mesh quality. The method includes the following steps of: 1, separation surface construction: a separation surface is constructed according to the contact position of a cutting tool and a mesh model; 2, mesh splitting: mesh splitting is carried out according to the separation surface constructed in thestep 1, so that an incision can be generated; and 3, mesh optimization: mesh optimization is performed on meshes formed after meshing, so that the quality of the meshes can be further improved.
Owner:HARBIN UNIV OF SCI & TECH
Triangular mesh optimization method for denture model
ActiveCN105243687AEasy to readDoes not involve deletionSpecial data processing applications3D modellingGraphicsDentures
The invention provides a triangular mesh optimization method for a denture model. The triangular mesh optimization method comprises the following steps: importing a model, obtaining an offset point, calculating a projection direction of the offset point, calculating a projection point distance [delta], determining [delta] of all peaks, sorting the peaks from large to small, translating and freezing the peaks, sequentially translating all points for carrying out mesh optimization, and the like. The invention belongs to the technical field of computer graphics processing. According to the triangular mesh optimization method for the denture model provided by the invention, a long-narrow trianglecan be removed on the premise that the shape of an original model does not greatly change and does not contract along with an increase of iterative times; and the optimization process does not involve element deletion to ensure that the optimization effect is not limited by the number of the peaks or the mesh density.
Owner:FOSHAN NANHAI GUANGDONG TECH UNIV CNC EQUIP COOP INNOVATION INST +2
Heavy-load AGV frame lightweight design method based on finite element analysis
PendingCN111460711AImprove optimization efficiencyGuaranteed accuracyGeometric CADDesign optimisation/simulationCommercial softwareElement analysis
The invention discloses a heavy-load AGV frame lightweight design method based on finite element analysis, and the method comprises the steps: carrying out t mid-plane extraction of an original framemodel, carrying out geometric cleaning in order to simplify the model and reduce the calculation amount, and carrying out grid optimization of a bigger hole; and finally, conducting automatic mesh generation on the whole frame, mesh quality inspection and further conducting processing on meshes with the quality not meeting the requirement; applying a material and component connection mode meetingindustrial requirements to the frame model; after the above model is established, applying a static load to the model, analyzing rigidity and strength changes under different working conditions and providing a basis for lightweight design; under the condition that the frame meets the strength and rigidity requirements, selecting independent variables, constraint conditions and a target function, and finally performing size optimization by using INSIGHT commercial software. The lightweight design of an AGV frame is realized based on finite element analysis, and the manufacturing cost is saved under the condition of meeting the industrial actual application scene.
Owner:SOUTH CHINA UNIV OF TECH
Survey mesh optimization method, electronic device and computer readable storage medium
The invention discloses a survey mesh optimization method. The method comprises the steps of extracting car insurance case report information pre-stored in a database; performing clustering analysis for the extracted car insurance case report information to obtain a hot region and a hot time period of a car insurance case; and according to the hot region and the hot time period of the case, obtained by the clustering analysis, adjusting a survey region mesh preset in the database. An existing survey mesh can be optimized and the overall survey working efficiency can be improved.
Owner:PING AN TECH (SHENZHEN) CO LTD
A real-time water droplet simulation method based on surface mesh
The invention discloses a real-time water droplet simulation method based on a surface grid. The method simplifies the three-dimensional fluid motion model into a surface grid model; iterates and implicitly calculates the average curvature flow at each step to generate the effect of surface tension; The contact angle calculation changes the shape of the water drop when it touches the solid surface; the invention realizes the fusion and splitting of the grid by performing a series of grid optimization and connectivity tests, improves the quality of the grid, and obtains real-time data related to a variety of real physical experiments. Approximate droplet motion effects, including wavelets when droplets collide, truncation of water columns, and flow of droplets on solid surfaces.
Owner:ZHEJIANG UNIV
A topological mesh generation method and electronic device based on boundary constraints
ActiveCN109408870AEasy to divideEasy to optimizeDesign optimisation/simulationSpecial data processing applicationsMetric tensorMesh optimization
The invention discloses a topological mesh generation method and an electronic device based on boundary constraints. The method comprises: according to the load condition of a geometric component to be analyzed and the geometric characteristic of the geometric component, the boundary of the geometric component is constrained, and a discrete node about the constraint is set; connecting the discretenodes and meshing to obtain an initial discrete triangular mesh; as for that initial discrete triangular mesh, an optimized triangular mesh is obtain by utilizing a topological mesh optimization method and a metric tensor and optimize the initial discrete triangular mesh by an iterative method based on a boundary constraint condition. The invention makes the process of mesh division and optimization very simple, fast and accurate, and only needs to restrict the boundary to generate a triangular mesh satisfying the calculation precision and saving the calculation resources.
Owner:INST OF IND TECH GUANGZHOU & CHINESE ACADEMY OF SCI
Feature constraint-based triangular mesh optimization method
ActiveCN113689566AQuality improvementPreserve detailed features3D modellingTheoretical computer scienceMesh optimization
The invention relates to the technical field of computer graphics and virtual reality, and discloses a feature constraint-based triangular mesh optimization method. The method comprises the following steps: reading and initializing mesh model data; setting a simplified target and the number of iterations; calculating edge influence factors of the triangular mesh model; weighting to the edge shrinkage cost; determining a retractable edge, and finding the most suitable folding vertex position; sorting the new folding cost and the most suitable vertex position folding cost; folding the edge with the minimum cost, and updating the vertex position; calculating the percentage of the shrinkage edge in the initial model, and if the percentage is satisfied, performing a grid optimization module; otherwise, recalculating and sorting the folding cost; using an improved Laplacian operator and average curvature operator combination method during grid optimization; optimizing an inferior triangle for the simplified triangular mesh model; and calculating an error between the initial model and the optimized model, and ending the algorithm when a threshold value is reached.
Owner:HUAIYIN INSTITUTE OF TECHNOLOGY
Finite element mesh optimization method and device based on deep reinforcement learning and medium
ActiveCN113221403AQuality improvementImprove efficiencyInternal combustion piston enginesCharacter and pattern recognitionAlgorithmTheoretical computer science
The invention relates to the field of grid division, in particular to a finite element grid optimization method and device based on deep reinforcement learning and a medium, and the method comprises the steps: obtaining initial finite element grid data of a geometric model; generating a three-dimensional model of the geometric model according to the initial finite element grid data; performing feature recognition and classification on the three-dimensional model by adopting a detection network to obtain local features of the three-dimensional model and a classification result of the local features; inputting the unreasonable local features into an optimization network so as to enable the grid quality of the adjusted finite element grid data to meet a set requirement; capturing a readjustment strategy of a user on the adjusted finite element grid data, and performing reinforcement learning on the optimization network by taking the readjustment strategy as forward excitation so as to update the optimization network; and continuing to optimize the adjusted finite element grid data by adopting the updated optimization network. According to the embodiment of the invention, the accuracy of grid division can be improved.
Owner:中汽数据(天津)有限公司
Image splicing method and splicing system based on grid optimization and readable storage medium
ActiveCN112801870ARun fastGood effectImage enhancementImage analysisPattern recognitionComputer graphics (images)
The invention discloses an image splicing method and splicing system based on grid optimization and a readable storage medium; the method comprises the steps: S1, obtaining a to-be-spliced image, and screening out feature points in the to-be-spliced image; s2, performing grid division on each single-row image, and calculating to obtain a transformation matrix of each grid on the image by at least combining region similarity transformation and local homography transformation; and S3, performing recursion of grid transformation based on the transformation matrix of each grid in the single-row images and by using the adjacent relation between the single-row images, thereby splicing the images in different rows. According to the method, the problem of inconsistent transverse overlapping rate is solved, and the method can be widely applied to aerial image splicing and infrared image splicing.
Owner:CENT SOUTH UNIV
RAR grid optimization method and system based on CAD model
PendingCN114329668AShorten the timeWill not interfere with each otherGeometric CADDesign optimisation/simulationAlgorithmTheoretical computer science
The invention discloses an RAR mesh optimization method and system based on a CAD model, and the method comprises the steps: carrying out the feature calculation of a CAD mesh model which is subjected to triangular mesh discretization and is stored according to a surface, obtaining a feature edge and a target edge length, and then carrying out the optimization of the RAR mesh according to the obtained feature edge and target edge length. A CAD mesh model which is subjected to triangular mesh discretization and stored according to surfaces is subjected to mesh optimization surface by surface, the surfaces are subjected to mesh optimization operation in parallel at the same time by utilizing the characteristic edge and the target edge length, the surfaces do not interfere with each other during mesh optimization, the mesh optimization time can be greatly saved, the mesh model is approximated with an original CAD model, and the mesh optimization efficiency is improved. According to the method, the accuracy of initial grid features is guaranteed, original grid optimization operators are further constrained by introducing feature edges and boundary edges of faces, and the features of an original CAD model cannot be eliminated in the grid optimization process under the condition that the grid optimization quality is guaranteed.
Owner:XI AN JIAOTONG UNIV
Anti-noise three-dimensional grid optimization method based on Mumford-Shah algorithm framework
InactiveCN111640188APrecisely becomeGood effectImage enhancementImage analysisAlgorithmTheoretical computer science
The invention provides an anti-noise three-dimensional grid optimization method based on a Mumford-Shah algorithm framework, and the method specifically comprises the steps: constructing a Mumford-Shah model, and discretizing the Mumford-Shah model; obtaining a vertex set, an edge set and a surface set of a triangular mesh model of the CAD model; calculating domain information of the vertex set, the edge set and the surface set; calculating a surface normal vector of a triangular mesh model of the CAD model; setting an optimization target of a surface normal vector according to the discretizedMumform-Shah model; converting the optimization target into an N-subproblem and a v-subproblem; adopting a direction alternating method and a variable fission method to iteratively solve the N-subproblem and the V-subproblem to obtain an optimized surface normal vector; updating the vertex position of the triangular mesh model of the CAD model by adopting a mesh reconstruction algorithm to obtaina denoised triangular mesh model of the CAD model; the method provided by the invention has the beneficial effects that the geometrical characteristics of the triangular mesh of the CAD model can bereserved to the greatest extent while various types of noises are processed.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)
Ansys Ls-Dyna-based ball load service module falling analysis method
PendingCN114722671ARealize analysisEasy to buildSustainable transportationDesign optimisation/simulationElement modelCoarse mesh
According to the method, on the basis of an Ansys software platform, the finite element model of the ball load service module is established for falling analysis, coarse mesh division is used during primary analysis, the mesh division time can be shortened, the whole analysis time can be saved, the finite element analysis rate can be increased, and an analysis result can be obtained quickly; and when the analysis result meets the falling requirement, grid optimization is carried out on the whole model according to a finite element grid inspection standard, so that the accuracy of the analysis result is improved. According to the method, the problems that in the prior art, the analysis period is long, the experiment cost is high, the requirement for building a test model and an environment is high, and effective analysis cannot be carried out due to the fact that simulation of the falling process of the load cabin is difficult are solved.
Owner:AEROSPACE INFORMATION RES INST CAS
Simulation method for funnel breast orthopaedic surgery
InactiveCN101488236BIncrease success rateInternal osteosythesisDiagnostic recording/measuringThoracic boneMechanical models
The invention discloses a funnel chest orthopaedic surgery simulation method; chest three-dimension visualization bone models and costal cartilage models are respectively processed by face mesh division, and the mesh is optimized; a mesh conversion is used on the basis of mesh optimization, and a chest model is converted into a body mesh from a face mesh; rib, costal cartilage and breast bone arerespectively material-evaluated, and skeleton body mesh model of each part is assembled so as to obtain a complete chest three-dimensional mechanical model; boundary conditions and loading force moment are determined, and the chest model is processed by finite element analysis so as to obtain the stress, strain and displacement conditions of each skeleton part under the action of different external forces; the incision position, support plate material, fixing method and supporting force moment of funnel chest surgery are simulated so that the success ratio of funnel chest surgery is increasedto over 98% from 70-90% of the prior art.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Device for simulating soft tissue deformation and simulation system
PendingCN114241156AMeets requirementsIncrease success rateComputer-aided planning/modelling3D modellingMorphingSoft tissue deformation
The invention discloses a device for simulating soft tissue deformation and a simulation system. The real-time performance and the rendering authenticity of the simulation system are well balanced through a local deformation algorithm and operation area grid optimization, puncture and cutting simulation of any area of soft tissue can be achieved, and therefore the effect that puncture sites and cutting paths are free is achieved; and the soft tissue deformation process generated by the virtual operation is quickly simulated, so that vivid visual rendering and mechanical feedback are realized, and the requirements of the virtual operation are met.
Owner:SHANGHAI NINTH PEOPLES HOSPITAL AFFILIATED TO SHANGHAI JIAO TONG UNIV SCHOOL OF MEDICINE
Tetrahedral mesh generation method and device for three-dimensional solid model
ActiveCN104063903BDelaunay properties ensureEfficient repair3D modellingComputer graphics (images)Tetrahedral mesh generation
The invention provides a tetrahedral mesh generation method and device for a three-dimensional solid model. The method comprises the steps that coarse sampling is carried out on the solid model boundary, an initial tetrahedral mesh is built based on sampling points, and the corresponding relation between solid model information and initial tetrahedral mesh information is built; parallel domain partition is carried out; mesh subdivision and mesh optimization are carried out on parted areas in parallel, wherein the mesh optimization is used for keeping the model boundary according to the solid model information; sub-area meshes are combined into a whole mesh. According to the tetrahedral mesh generation method and device, coarse sampling is carried out in the model boundary sampling stage, and three-dimensional model information is brought in the tetrahedral mesh generation process, so that geometric boundary characteristics of the model is dynamically recovered in the parallel process, and model boundary sampling can be efficiently achieved; due to the fact that mesh subdivision and mesh optimization are carried out in the follow-up parallel process, the model boundary characteristics can be kept, and meanwhile the tetrahedral mesh is efficiently generated.
Owner:TSINGHUA UNIV
Optimization method and device for finite element triangular mesh
PendingCN113792458AIncrease minimum angleReduce the maximum angleDesign optimisation/simulationSpecial data processing applicationsProduct modelingStructural engineering
The invention discloses an optimization method and device for a finite element triangular mesh, and relates to the technical field of product modeling analysis. According to the method, internal nodes of a mesh are traversed, and angle-based local mesh optimization is carried out on each internal node, wherein according to the angle-based local mesh optimization, a polygon formed by all adjacent nodes of the internal nodes serves as a to-be-optimized local mesh block, and positions of optimized internal nodes are determined again according to positions of intersection points of angle equipartition lines of all internal angles of the polygon. According to the invention, the local mesh optimization is carried out on the internal nodes, so that integral optimization of a finite element triangular mesh is realized; and the positions of the internal nodes are updated by adopting the intersection points of the angle equipartition lines, so that the minimum angle in the mesh can be increased, and the maximum angle in the mesh can be reduced. The invention is easy to realize in parallel, has relatively high efficiency, and can greatly improve the overall quality of a mesh.
Owner:THE SECOND ACAD OF CASIC
Offshore culture area image splicing method based on non-uniform precision
ActiveCN113160052AImprove stitching accuracyStitching natureImage enhancementImage analysisGraphicsFishery
The invention discloses an offshore culture area image splicing method based on non-uniform precision, and the method comprises the following steps: image preprocessing: completing the image uniform light operation, and obtaining a net cage area mask; image sub-region division: dividing the image into a plurality of sub-regions according to the characteristics of a graph overlapping region; sub-region optimization splicing: using a feature point-based DLT algorithm and a photometric alignment-based grid optimization algorithm, and combining a net cage mask search suture line to perform high-precision splicing on the sub-regions; and panoramic optimization splicing: projecting the plurality of sub-regions to a panoramic plane by using the pose information, and realizing splicing among the sub-regions to obtain a panoramic image. According to the characteristics of the offshore culture area, the high-precision splicing algorithm is used in the sub-areas, the low-precision splicing algorithm is used between the sub-areas, and natural splicing of the offshore culture area is achieved.
Owner:SOUTH CHINA UNIV OF TECH
Scatterer three-dimensional finite element mesh optimization method based on neural network
PendingCN113722951AImprove calculation accuracyCharacter and pattern recognitionDesign optimisation/simulationElement modelTest sample
The invention provides a scatterer three-dimensional finite element mesh optimization method based on a neural network. The method comprises the implementation steps: obtaining a training sample set and a test sample set; establishing a mapping relation from the A-dimensional grid characteristic variable to a far-field radar cross section root-mean-square error by using a neural network; solving an optimal grid characteristic variable value by adopting a differential evolution algorithm; and obtaining an optimization result of the scatterer three-dimensional finite element mesh. According to the method, a neural network is utilized to establish a mapping relation from an A-dimensional grid characteristic variable to a far-field radar cross section root-mean-square error, and then the optimal value of the A-dimensional grid characteristic variable is solved by taking reduction of the far-field radar cross section root-mean-square error as a target; and the three-dimensional finite element mesh of the scatterer is optimized through a node insertion or node movement method, so that the calculation precision of the three-dimensional finite element model of the scatterer is improved.
Owner:XIAN CETC XIDIAN UNIV RADAR TECH COLLABORATIVE INNOVATION INST CO LTD +1
Digital-twin modeling method for automated testing pipeline for circuit breakers
PendingUS20210116505A1Centralized managementProgramme controlSimulator controlVirtual locomotionControl engineering
A digital-twin modeling method for an automated testing pipeline for circuit breakers involves acquiring a three-dimensional digitalized model of each mechanical installation in the testing pipeline; modeling hierarchy according to an actual production process and motion states; performing mesh optimization on the resulting model; designing movements of each said mechanical installation, so as to obtain mechanical movement tracks of the models; combining actual movement logic and cooperative relationship among the movements to edit the mechanical movement tracks of the models; and introducing motion control, so as to conduct motion simulation in a digital-twin scene, thereby implementing virtual movements synchronous with movements of the actual testing pipeline. The method realizes centralized management of production data of the pipeline and realizes remote visualized operation, management and maintenance of the testing pipeline, thereby providing a basic platform for digitalized production of miniature circuit breakers.
Owner:WENZHOU UNIVERSITY
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