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268 results about "Triangle mesh" patented technology
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A triangle mesh is a type of polygon mesh in computer graphics. It comprises a set of triangles (typically in three dimensions) that are connected by their common edges or corners. Many graphics software packages and hardware devices can operate more efficiently on triangles that are grouped into meshes than on a similar number of triangles that are presented individually. This is typically because computer graphics do operations on the vertices at the corners of triangles. With individual triangles, the system has to operate on three vertices for every triangle. In a large mesh, there could be eight or more triangles meeting at a single vertex - by processing those vertices just once, it is possible to do a fraction of the work and achieve an identical effect. In many computer graphics applications it is necessary to manage a mesh of triangles. The mesh components are vertices, edges, and triangles. An application might require knowledge of the various connections between the mesh components. These connections can be managed independently of the actual vertex positions. This document describes a simple data structure that is convenient for managing the connections. This is not the only possible data structure. Many other types exist and have support for various queries about meshes.
Real-time three-dimensional graph rendering optimization method and device based on deep learning
ActiveCN120088382AInternal combustion piston enginesGeometric image transformationAlgorithmGenerative adversarial network
The invention relates to the technical field of computer graphics, in particular to a real-time three-dimensional graphic rendering optimization method and device based on deep learning, and the method comprises the steps: carrying out the feature extraction of the geometric, texture and illumination information of a graphic through a multi-modal deep neural network, and generating a high-dimensional feature vector; dynamically adjusting the resolution of the triangular mesh by adopting a graph neural network, and outputting an optimized geometric mesh structure; predicting global illumination of the graph by using a neural radiation field model, and generating an optimized illumination map through a variational auto-encoder; performing fusion analysis on the illumination map and the texture data by using a visual Transform model to generate an adaptive texture mapping scheme; and in combination with a rendering scheduling strategy of deep reinforcement learning and a super-resolution reconstruction method of a generative adversarial network, a rendering result is optimized, and a rendered image is post-processed. According to the method, multiple deep learning technologies are comprehensively utilized, and the quality and efficiency of real-time three-dimensional graph rendering are remarkably improved.
Owner:BEIJING WEISHIWEI INFORMATION TECH CO LTD
Method and system for three-dimensional (3D) imaging of underground goaf, and readable storage medium
A method for three-dimensional (3D) imaging of an underground goaf includes: obtaining a video image and point cloud data of an underground goaf; determining a posture transformation matrix, and aligning the video image and the point cloud data; identifying a material texture based on the video image to obtain material texture information; dividing the point cloud data into triangular meshes to form an initial 3D model of the underground goaf; mapping the material texture information onto the 3D model to form a target 3D model with a material texture attribute; calculating a bidirectional reflectance distribution function (BRDF) of the target 3D model based on the material texture attribute; simulating global illumination, and constructing a rendering equation; and making a setting to emit ray from a viewpoint, and performing ray tracing based on the rendering equation to obtain a high-brightness real scene image of the underground goaf.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN) +1
RMIP: fast tessellation-free GPU displacement ray tracing via inversion and oblong bounding simulation
A system generates, based on a displacement bounds data structure and a triangle mesh modeling a surface of a 3D virtual object within a 3D virtual scene, a displaced triangle mesh including one or more displaced surface bounding prisms, each of the one or more displaced surface bounding prisms displaced from a respective base triangle of a plurality of base triangles of the triangle mesh structure based on displacement bounds defined in a displacement bounds data structure for an area of a 2D texture space corresponding to a location of the respective base triangle defined by the 3D virtual scene. The system performs, using the displaced triangle mesh structure, a ray tracing process for a ray associated with a pixel of a 2D image of the virtual scene including determining, responsive to determining the ray intersects the particular displaced surface bounding prism, a location of an intersection of the ray.
Owner:ADOBE INC
Long-distance pipe-jacking tunnel construction method based on three-dimensional stability analysis
PendingCN119616494AAccurately predict instabilityprevent subsidenceGeometric CADPipe laying and repairAnalytic modelNumerical models
A long-distance pipe-jacking tunnel construction method based on three-dimensional stability analysis comprises the following steps: constructing a three-dimensional numerical model based on geological exploration data; performing high-precision discretization processing to form an infinitesimal triangular mesh; assigning physical and mechanical parameters to the soil body in the model; deducing a pipe-jacking tunnel excavation face supporting force calculation formula by applying a limit analysis upper limit theorem; developing an integrated calculation program, and performing comparative analysis with measured data; the accuracy of a calculation program is verified through actual measurement data, the jacking force is dynamically optimized by integrating construction parameters, and the influence of additional stress of the upper structure on construction stability is evaluated; the three-dimensional stability analysis model is optimized and updated, and accurate control over the construction process is achieved; and according to the optimization model and a data analysis result, a construction scheme is adjusted in real time to adapt to stratum change and construction deviation. Compared with a traditional method, the stability analysis precision of pipe-jacking tunnel construction is improved, the construction scheme is optimized, and the method has remarkable engineering application value and popularization prospects.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Image registration method based on improved ORB feature extraction and grid feature matching
The invention discloses an image registration method based on improved ORB feature extraction and grid feature matching. The method comprises the following steps: inputting an image to be extracted; using an improved FAST algorithm to extract feature points of the to-be-spliced image; establishing a BRIEF descriptor, and obtaining a BRIEF descriptor with a direction; according to the feature point set of the to-be-spliced image, establishing a Delaunay triangular grid taking the feature points as vertexes; judging the similarity of triangles, and obtaining similar triangles formed by the feature points; matching the similar triangle vertexes by using a Hamming distance to obtain an optimal matching feature point pair; obtaining affine matrix parameters by using an SVD method; according to the image registration method provided by the invention, the image quality is ensured, the feature extraction efficiency and the extraction precision can be improved, wrong matching is reduced, the stability is improved, the real-time performance of video stitching is improved, the waste of memory resources is reduced, the equipment cost is reduced, the working efficiency is greatly improved, and the method is suitable for popularization and application. And a better method is provided for image splicing.
Owner:63963 TROOP OF THE PLA
Intelligent photocuring 3D printing model optimization method
ActiveCN119388758Aquality improvementhigh strengthAdditive manufacturing apparatusManufacturing data aquisition/processingAlgorithmGenerative adversarial network
The invention provides an intelligent photocuring 3D printing model optimization method, and relates to the technical field of photocuring 3D printing, and the method comprises the following steps: obtaining a 3D printing model file uploaded by a user; analyzing geometric information in the model file, and extracting a triangular grid structure, normal vector information and a surface area; key feature areas of curved surfaces, corners and edges in the model are identified, printing parameter data are collected, and a target model summary file is generated; an optimization printing target is defined, an optimization model is generated based on the generative adversarial network, model quality is evaluated through a discriminator network, a multi-target optimization result is analyzed, and an optimal balance point among different targets is found; and testing the optimized model and the printing parameters by using virtual reality, and performing self-adaptive correction according to a simulation test result to adjust to the optimal printing parameters. According to the method, the geometric features and the material attributes of the 3D model are automatically analyzed, potential weaknesses in the model are identified, and the 3D printing model is intelligently optimized.
Owner:SHENZHEN ELEGOO TECH CO LTD
Three-dimensional scene simulation method and system based on 3D Gaussian sputtering
ActiveCN119903705AGeometric CADSustainable transportationComputational physicsMechanical engineering
The invention provides a three-dimensional scene simulation method and system based on 3D Gaussian sputtering in the technical field of physical simulation. The method comprises the steps that S1, an initial point cloud model is obtained based on reconstruction of all object images; s2, based on the initial point cloud model, mask label reconstruction is carried out to obtain a triangular mesh model, and a tetrahedral mesh model is obtained through expansion; s3, creating a 3D Gaussian sputtering model based on the triangular mesh model through a 3D Gaussian kernel function; s4, through implicit integration and finite element modes, controlling the tetrahedral mesh model to simulate the deformation and motion effect of the simulation target based on physical attributes, and collecting the deformation gradient and vertex coordinates of each tetrahedral mesh in the deformation process; s5, synchronously deforming the 3D Gaussian sputtering model based on the deformation gradient; and S6, the deformed 3D Gaussian sputtering model is mapped to the tetrahedral mesh model based on the vertex coordinates, and a simulation result is obtained through rendering. The method has the advantage that the three-dimensional scene simulation precision is greatly improved.
Owner:XIAMEN UNIV
Road slope three-dimensional visual modeling method, device, medium and equipment
The invention discloses a road slope three-dimensional visualization modeling method and device, a medium and equipment, and relates to the technical field of three-dimensional visualization. Comprising the following steps: collecting point cloud data of a road slope, and obtaining a feature vector of each point based on the point cloud data; dividing each point into a plurality of different classes based on the similarity of the feature vectors, wherein each class comprises a plurality of sub-clusters dispersed in geographic space positions; obtaining a confusion feature value used for representing the confusion degree of the point cloud data in each sub-cluster and the number of sub-clusters belonging to other categories in the neighborhood of each sub-cluster; setting the number of triangular meshes in direct proportion to the disordered feature value and the number of the sub-clusters belonging to other categories for each sub-cluster; and on the basis of the set number of the triangular meshes, using a triangulation method to connect the midpoints of the sub-clusters into non-overlapping triangular meshes, and obtaining a road slope three-dimensional model.
Owner:安康市公路局 +1
Rapid conversion method and system from explicit geometry to implicit geometry
The invention relates to a rapid conversion method and system from explicit geometry to implicit geometry, and the method comprises the steps: constructing a linear boundary body hierarchical structure for an input triangular grid, and constructing an octree structure; nodes of the octree structure are used as sampling points, and an adaptive grid unsigned distance field is calculated in parallel for each sampling point; calculating a pseudo normal of the triangular mesh by using an angle weight pseudo normal algorithm, and calculating a symbol of the unsigned distance field of the adaptive mesh by using the pseudo normal of the triangular mesh; and determining data of the sign distance field according to the adaptive grid unsigned distance field and the sign of the adaptive grid unsigned distance field, and completing conversion from implicit geometry to explicit geometry. According to the method, the conversion from implicit geometry to explicit geometry can be quickly realized, the conversion efficiency is greatly improved while high precision is kept, and the performance of graphic processing, physical simulation and application scenes can be improved.
Owner:WUHAN UNIV
Universal 3D intelligent modeling method for multi-view coupling constraint
PendingCN120088427AInternal combustion piston engines3D-image renderingDimensional simulationAlgorithm
The invention provides a universal 3D intelligent modeling method for multi-view coupling constraint, belongs to the technical field of three-dimensional simulation modeling, and solves the problems that an existing intelligent three-dimensional modeling generation method is poor in generalization ability, a generation result is easy to over-fit, and multi-view geometric inconsistency is easy to occur. Comprising the following steps: optimizing learnable three-dimensional representation through a pre-trained text generation image diffusion model and a fine-adjusted multi-view generation diffusion model, and generating initial three-dimensional representation which is completely consistent with text semantics; according to the transparency prediction information of each point in the preliminary three-dimensional representation and the multi-view rendering graph of the preliminary three-dimensional representation, extracting and converting into a rough three-dimensional grid representation containing geometric structure and texture information; a geometry and texture decoupling optimization method is adopted, multi-view coupling constraints are combined, the geometrical shape and the surface texture of the triangular mesh are finely adjusted and optimized respectively, and a three-dimensional triangular mesh model with high-quality geometrical morphology and realistic texture is generated.
Owner:HARBIN INST OF TECH
Hierarchical object modeling and rapid reconstruction method based on NeRF
ActiveCN119600199Aaccurate captureImprove sampling efficiencyImage analysis3D modellingPattern recognitionReconstruction method
The invention discloses a hierarchical object modeling and rapid reconstruction method based on NeRF, and the method comprises the following steps: image preprocessing: initially obtaining an image video frame through a camera, carrying out the related processing of an input image, including semantic segmentation, depth estimation, normal estimation and internal and external parameter calibration, and generating a corresponding semantic graph, a depth graph, a normal graph and camera parameters; space partitioning: partitioning the scene according to the semantic graph information and defining a bounding box; adaptive sampling: performing adaptive sampling by combining the depth map, the normal map and the camera parameters, and determining a sampling point set; and performing hierarchical vectorization SDF reconstruction, performing hierarchical vectorization SDF reconstruction by using the sampling points to obtain hierarchical SDF representation describing the shape of the object, converting the hierarchical SDF into a triangular mesh model, and completing three-dimensional object modeling and rapid reconstruction. The invention provides a hierarchical object modeling and rapid reconstruction method based on NeRF, objects in a scene are rapidly reconstructed, and downstream editing tasks, interaction and other applications are supported.
Owner:TSINGHUA SHENZHEN INTERNATIONAL GRADUATE SCHOOL +1
Three-dimensional Gaussian splashing and rasterization pipeline fused view synthesis system and method
The invention discloses a three-dimensional Gaussian splashing and rasterization pipeline fused view synthesis system and method. The method comprises the following steps of: 1, acquiring two-dimensional Gaussian primitives; 2, converting the two-dimensional Gaussian primitive into two triangular grids, and converting the two triangular grids into a world coordinate system; 3, baking the spherical harmonic coefficient of the color and the opacity data in a texture form; 4, enabling each Gaussian primitive to correspond to a texture block on the texture image set, enabling a triangle to cover the texture block in a UV space, and obtaining a Gaussian weight; 5, based on the obtained Gaussian weight, simulating an alpha mixing behavior in the three-dimensional Gaussian splashing pipeline by using a time-based jitter anti-aliasing method; and 6, training a symbol vector field SDF branch while training, and mutually supervising and constraining the output of the symbol vector field and the output of the two-dimensional Gaussian. The three-dimensional Gaussian splash can be rendered in a traditional rasterization pipeline of the unreal engine 4, and the fidelity equivalent to that of a special training pipeline is kept.
Owner:XIDIAN UNIV +1
Electromagnetic field simulation boundary absorption method and system based on triangular prism grid-FDTD
The invention discloses an electromagnetic field simulation boundary absorption method and system based on triangular prism grid-FDTD. The method comprises the following steps: constructing an initial triangular prism grid FDTD; virtual points are added in the triangular prism grid FDTD, and MurABC is constructed; and completing boundary absorption in the electromagnetic field simulation process by using MurABC. In the triangular grid, boundary absorption is carried out by intelligently designing the grid structure and the algorithm, the reflection effect can be effectively reduced, and the simulation accuracy is improved. In this way, unnecessary boundary interference can be avoided, and the whole simulation is closer to the actual situation.
Owner:ANHUI UNIV
Multi-axis numerical control machining tool path generation method based on part model
The invention relates to the technical field of program control, in particular to a multi-axis numerical control machining tool path generation method based on a part model. The method comprises the following steps: acquiring three-dimensional model data of a part; constructing a triangular mesh model based on the three-dimensional model data of the part, and performing adaptive mesh generation on the triangular mesh model to generate a refined triangular mesh model; calculating the normal vector of each triangle based on the refined triangular mesh model to obtain triangular mesh normal vector data; according to the refined triangular mesh model, preliminary tool path design is carried out, and preliminary tool path data are obtained. According to the method, through refined path design, cutter posture optimization, collision detection and path smoothing, the precision, safety and efficiency of multi-axis numerical control machining are improved, and reliable guarantee is provided for machining of complex parts.
Owner:SHENZHEN ZHENGGONG PRECISE HARDWARE&PLASTIC CO LTD
A rapid modeling method for large-size composite material structures with varying thickness solid meshes based on yarn model
This invention discloses a rapid modeling method for large-size composite structures with variable thickness solid meshes based on a yarn model, belonging to the field of finite element modeling of fiber-reinforced composite materials. Its core process includes: for a large-size component S to be analyzed, generating yarn models for each ply partition using composite material design software and batch-dividing triangular meshes; similarly, extracting smooth surface profiles from the three-dimensional geometry of the overall component S and generating a structured shell mesh as the base carrier; then, using a voxel hash-accelerated spatial Boolean intersection algorithm to automatically identify the element sets of each ply partition between each yarn mesh and the overall shell mesh, generating a stepped solid mesh through normal offset, ensuring interface compatibility through node merging, and finally assigning material properties and generating an analysis model that can be directly submitted for solution. This invention significantly reduces manual workload and error risk, providing an efficient and reliable preprocessing solution for the curing deformation and strength analysis of composite material structures.
Owner:BEIHANG UNIV
Generating partitioned images using differentiable mesh generation pipelines
PendingCN119540375ARepeatable and rationally designedReasonable digital designDrawing from basic elementsBiological modelsComputer graphics (images)Text entry
The present disclosure relates to systems, methods, and non-transitory computer readable media that provide a differentiatable partitioning system that uses fully automated generative methods of machine learning and text guidance to generate aesthetically reasonable, periodic, and partitioned non-square images. That is, given a textual description of an object and a symmetric pattern of 2D planes, the system produces a textured 2D mesh that is visually similar to the textual description, follows geometric rules that ensure that it can be used to block the plane, and contains only foreground objects. In effect, the disclosed system generates a rationalized textured 2D triangular mesh that visually matches the text input and optimizes the texture and shape of the mesh and satisfies overlap conditions and partitioning conditions. Using the described methods, a differential partitioning system may generate a grid such that edges and vertices are aligned between repeatable instances of the grid.
Owner:ADOBE INC
Rapid self-adaptive re-gridding method for triangular mesh without self-intersection
The invention discloses a rapid self-adaptive re-gridding method for a triangular mesh without self-intersection. According to the method, intersection detection is executed only in a key region by dynamically identifying the key region in a region with a complex structure. A flipping sensing energy mechanism is introduced, and triangular flipping and generation of irregular sharp edges are effectively avoided by constraining an optimization space of local re-gridding operation. On the basis of a discrete curvature initialization size field, in combination with Laplacian smoothing and quasi-geometric adjustment algorithms, smooth transition of the size field is rapidly achieved, the strip phenomenon is eliminated, and the grid quality is improved. The method is suitable for high-defect, non-manifold and multi-component input, and can quickly generate a high-quality triangular mesh on the premise of ensuring no intersection. Experiments show that when the method is used for processing complex models, the efficiency is improved by one order of magnitude compared with that of a traditional method, non-intersecting grids can be generated on all test models, and the method is suitable for computer graphics application such as numerical simulation, modeling and animation.
Owner:ZHEJIANG UNIV
Method and system for real-time rendering of hydrodynamic data
The invention provides a method and system for real-time rendering of hydrodynamic data, and the method comprises the steps: obtaining hydrodynamic result data, carrying out the standardized processing of the hydrodynamic result data according to a target format, and obtaining a standardized result; reading vertex coordinate data and triangular grid index data of the standardized result, traversing a vertex coordinate data set based on values of the triangular grid index data, and further constructing a grid; the hydrodynamic result data of the current time period are packaged and transmitted to the water body grid models, and then grid vertex coordinate data of the water body grid models of the two different time periods are stored into a plurality of UV channels; creating a shader, reading vertex coordinate data in the UV channel and forming three-dimensional vector coordinate data; and constructing the texture of the water body to obtain a rendering result. According to the method, through a mode of reading the hydrodynamic data of multiple time periods in real time and rendering the data, the time for scientific calculation is shortened, and real-time rendering is supported.
Owner:ECCOM NETWORK SYST CO LTD
Cutting simulation blank surface reconstruction method and device and readable storage medium
PendingCN119578030AImprove efficiencyreduce computationDetails involving processing stepsDesign optimisation/simulationVoxelDexel
The invention belongs to the technical field of cutting machining, and relates to a cutting simulation blank surface reconstruction method and device and a readable storage medium. Discretizing the tool and the blank to obtain a tool Tri-Dexel model and a blank Tri-Dexel model, and extracting a tool Dexel chain set and a blank Dexel chain set; boolean operation is conducted on the tool Dexcel chain and the blank Dexcel chain, a blank surface voxel model and the cutting condition of the tool Dexcel on all edges of blank surface voxels are obtained, then the state value of all angular points of the blank surface voxels is obtained, and whether the voxels are boundary voxels containing contour surfaces or not is judged; taking the voxel containing the contour surface as a to-be-cut voxel, obtaining a triangular mesh formed by intersection points of the to-be-cut voxel and the contour surface, and calculating vertex coordinates and a normal vector of the triangular mesh; and obtaining a surface grid based on the vertex coordinates and the normal vectors of all the triangular grids so as to perform surface reconstruction on the blank.
Owner:SUZHOU QIANJI INTELLIGENT SOFTWARE CO LTD
Four-side surface re-topology method based on frame field prediction and electronic equipment
The invention provides a quadrilateral surface re-topology method based on frame field prediction and electronic equipment. The quadrilateral surface re-topology method based on frame field prediction comprises the following steps: inputting a triangular mesh model into a frame field neural network model, and carrying out direction regression and amplitude diffusion taking the direction as the condition to obtain a corresponding frame field; performing deformation based on the frame field to obtain a deformed grid model; performing isotropic quadrilateral re-mesh division on the deformed mesh model to obtain an initial quadrilateral mesh model; and performing inverse deformation on the initial quadrilateral mesh model to obtain a quadrilateral mesh model corresponding to the triangular mesh model. Through the steps of frame field inference, deformation, isotropic quadrilateral grid re-division and inverse deformation, the quality of the finally generated quadrilateral grid is ensured, so that the purpose of improving the quality of the quadrilateral grid is achieved.
Owner:BEIJING WAZIDA TECH CO LTD
Three-dimensional geological section real-time cutting method and system and storage medium
The invention relates to the technical field of computer graphics, in particular to a three-dimensional geological section real-time cutting method and system and a storage medium, and the method comprises the steps: constructing a BVH tree to accelerate the cutting of a three-dimensional geological model, and calculating the projection of intersecting line segments on a cutting surface two-dimensional coordinate system to obtain a projection line segment set; constructing an undirected graph structure based on the projection line segment set; and extracting a closed profile contour based on the undirected graph structure, subdividing a triangular grid, and rendering and displaying. The implementation of the scheme can break through the traditional preprocessing dependence, and improve the profile generation efficiency and the visualization integrity.
Owner:WUHAN DIDA KUNDI TECH CO LTD
Liquid rocket engine lattice regenerative cooling structure thrust chamber and design method thereof
InactiveCN119222066Aeffective absorptionGuaranteed stabilityGeometric CADAdditive manufacturing apparatusSelective laser meltingDesign software
The invention discloses a liquid rocket engine thrust chamber with a lattice regenerative cooling structure and a design method thereof, and belongs to the field of engines, and the design method comprises the following steps: determining the overall structure of the liquid rocket engine thrust chamber according to the project general situation; determining the lattice regenerative cooling structure as a truss lattice structure, selecting the truss lattice structure, and determining a layout mode; designing the determined three-dimensional model of the thrust chamber by using computer aided design software; exporting the three-dimensional model as an STL (Standard Template Library) file, and representing the surface of the three-dimensional model by using triangular grids by the STL file, so as to facilitate subsequent 3D printing treatment; and performing selective laser melting and printing to form a thrust chamber product, and performing post-treatment after printing is completed. The lattice regeneration cooling structure is directly arranged between the inner wall and the outer wall of the thrust chamber, so that the weight is greatly reduced, the effective heat transfer coefficient of the cooling channel is increased, the strength of the inner wall and the cooling channel is improved, and the service life of the thrust chamber is prolonged.
Owner:XIANGTAN UNIV
Transformer substation twinborn model construction method based on VR virtual reality technology
ActiveCN120495574AInput/output for user-computer interactionImage analysisComputational scienceTransformer
The invention relates to the technical field of twinborn model construction, in particular to a transformer substation twinborn model construction method based on a VR virtual reality technology, and the method comprises the steps: obtaining dense point clouds of transformer equipment in a transformer substation scene, carrying out the meshing of all dense point clouds, and recording the vertexes of all obtained triangular grids as triangular point clouds; calculating a steep coefficient, a coplanar representation value, local complexity, a degradation evaluation value and a degradation contribution degree of each triangular grid; determining a distortion evaluation value; and for the distribution position of each trigonometric point cloud on the transformer equipment, determining the reconstruction weight of each trigonometric point cloud, performing three-dimensional reconstruction on the transformer equipment in the transformer substation scene, and constructing a transformer substation twinborn model. The transformer equipment twinborn model in the transformer substation scene is closer to the original condition, small and medium-sized equipment in the transformer substation scene is modeled more finely, and the visualization effect of the transformer substation twinborn model is improved.
Owner:UHV CO OF STATE GRID HEILONGJIANG ELECTRIC POWER CO LTD +1
Concrete construction joint acceptance method and equipment
The invention provides an acceptance method and equipment for a concrete construction joint, and the method comprises the steps: obtaining the point cloud data of the surface of the construction joint after the concrete construction joint is coated with a retarder and is subjected to roughening in a final setting stage, and reconstructing a three-dimensional surface topography model of the surface of the construction joint according to the point cloud data; performing triangular meshing on the three-dimensional surface topography model to obtain the area of each triangular mesh surface and the projection area of each triangular mesh surface on the concrete construction joint plane; the ratio of the total area and the total projection area of all the triangular mesh faces is obtained to serve as a current roughness evaluation index of the surface of the construction joint; and according to the current roughness evaluation index and a preset construction quality requirement, generating an acceptance opinion of the construction joint. The quantitative roughness evaluation index is obtained based on the point cloud data of the surface of the construction joint, and acceptance is performed according to the roughness evaluation index, so that whether the construction joint treatment meets the requirement can be quickly and accurately judged, and the construction quality of the concrete construction joint and the stability and reliability of the structural performance are ensured.
Owner:BEIJING ORIENTAL YUHONG WATERPROOF TECH CO LTD
Grouting subgrade water-vapor-heat coupling simulationmethod and system, device and medium
PendingUS20260087211A1Geometric CADDesign optimisation/simulationThermal insulationPartial differential equation
Provided are a grouting subgrade water-vapor-heat coupling simulation method and system, a device and a medium, including: constructing a subgrade water-vapor-heat coupling geometric model; acquiring a partial differential equation of a subgrade water-vapor-heat coupling process, and establishing a relationship between physical fields; setting a temperature and water boundary condition; performing mapping and free triangle mesh generation on the subgrade water-vapor-heat coupling geometric model to obtain a meshing model; selecting initial data, and performing a simulation solution on the meshing model to obtain a water-vapor-heat coupling simulation result; and analyzing the impact of a double-layer polyurethane grouting thermal insulation structure on a temperature distribution, a freeze-thaw cycle depth, and water migration of a subgrade.
Owner:SUN YAT SEN UNIV
Anisotropic triangular mesh generation method
The invention belongs to the technical field of computer graphics geometric processing, and particularly relates to an anisotropic triangular mesh generation method, which comprises the following steps of: acquiring triangular mesh data of an object model, and expanding the triangular mesh data from a three-dimensional space to a two-dimensional plane by adopting a mesh parameterization method; based on the expanded triangular mesh data, inputting the set data of each vertex into a trained deep neural network model to obtain an anisotropy measurement parameter and a predicted sampling point coordinate of each vertex; constructing an ACVT energy function according to the anisotropy measurement parameters and the predicted sampling points, and minimizing the ACVT energy function to obtain optimized triangular grid data on a two-dimensional plane; mapping the optimized triangular mesh data from a two-dimensional plane to a three-dimensional space through barycentric coordinates; the method can guarantee the quality of the generated grid and improve the operation efficiency at the same time.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Aircraft simulation design method based on tetrahedral mesh secondary boundary layer generation
ActiveCN119272420AImprove production efficiencyImprove robustnessGeometric CADSustainable transportationFlight vehicleClassical mechanics
The invention relates to an aircraft simulation design method based on tetrahedral mesh secondary boundary layer generation. The method comprises the following steps: reading an aircraft geometric model file, establishing a far field bounding box by taking an aircraft as a center, and generating a tetrahedral mesh of an external flow field by using an unstructured mesh generation technology; generating an integral grid with a boundary layer between the triangular grid and the tetrahedral grid of the specified curved surface, wherein the integral grid has a specified layer number, a specified first layer height and a specified growth rate; exporting the integral grid with the boundary layer as a universal grid file in a cgns format, storing, solving and calculating to obtain a numerical result of viscous flow near the boundary layer in the shape of the aircraft; and according to a numerical result, analyzing a physical phenomenon existing near the boundary layer region in the current aircraft appearance, and when the aircraft appearance reaches a required aerodynamic performance index, outputting a final aircraft geometrical shape. By adopting the method, the robustness can be improved, and the simulation design period of the aerodynamic configuration of the aircraft can be shortened and optimized.
Owner:NAT UNIV OF DEFENSE TECH
Vector field guidance-based variable grid method grid automatic division method and device
The invention discloses a variable grid method grid automatic division method and device based on vector field guidance. The method comprises the following steps: extracting boundary feature points according to geometric features of an input model boundary so as to construct a feature polygon of a model, and dispersing the feature polygon into a triangular mesh model; constructing a vector field based on a Laplacian operator by using the triangular mesh model; starting from the geometric center of the model, setting an initial quadrilateral grid as an initial paving layer, paving the quadrilateral grid outwards layer by layer, and if the paving layer exceeds the boundary of the model, stopping paving; when each layer of quadrilateral grid deforms, uniform transition is achieved through a size transition template; and finally, generating a boundary quadrilateral mesh of the model by adopting a mapping method, mapping discrete points on the boundary of the feature polygon back to the boundary of the input model, and outputting a generated quadrilateral mesh model. According to the method, full-automatic generation of the quadrilateral mesh can be realized, and the method is particularly suitable for mesh generation in finite element simulation pretreatment.
Owner:JIANGNAN UNIV
RCS solving method of uniaxial anisotropic medium based on moment method
The invention provides an RCS (radar cross section) solving method of a uniaxial anisotropic medium based on a moment method. The method comprises the following steps of: modeling a uniaxial anisotropic scatterer or a target model to be simulated in COMSOL; the surface of the scatterer is subjected to triangular mesh generation, and the size of a mesh is determined according to the wavelengths of electromagnetic waves inside and outside the scatterer; after the parameters of the scatterer and the background medium thereof are set, the grid is imported into the moment method for solving, and compared with a finite element method for solving the problem, the background medium of electromagnetic wave radiation and the interior of the scatterer do not need to be subjected to grid subdivision, and the degree of freedom only exists on the surface of the scatterer; the degree of freedom and memory used for solving the integral equation are far smaller than those used by a finite element method, and the method shows excellent calculation efficiency and calculation precision in actual examples.
Owner:TANGSHAN TECH (NINGBO) CO LTD
Grouting roadbed water-steam-heat coupling simulation method, system, equipment and medium
ActiveCN119272504AImprove stabilityIncreased durabilityGeometric CADDesign optimisation/simulationInsulation layerRoad engineering
The invention relates to the technical field of road engineering, in particular to a grouting roadbed water-steam-heat coupling simulation method, system, equipment and medium, and the method comprises the following steps: constructing a roadbed water-steam-heat coupling geometric model; obtaining a partial differential equation of a roadbed water-steam-heat coupling process, and establishing a mutual relation between physical fields; setting temperature and moisture boundary conditions; performing mapping and free triangular mesh division on the roadbed water-steam-heat coupling geometric model to obtain a mesh model; initial data are selected, simulation solution is conducted on the gridding model, a water-steam-heat coupling simulation result is obtained, and the influence of the double-layer polyurethane grouting heat preservation structure on roadbed temperature distribution, freezing and thawing cycle depth and water migration is analyzed. According to the invention, through comprehensive simulation of the double-layer polyurethane grouting thermal insulation structure roadbed under the water-steam-heat coupling effect, the influence of the polyurethane thermal insulation layer on the roadbed performance is quantitatively analyzed, and a theoretical basis is provided for road engineering technology research and roadbed optimization.
Owner:SUN YAT SEN UNIV