35 results about "Types of mesh" patented technology

A targeted heterogeneous medium in the form of an underground layered formation is gridded into a layered structured grid or a layered semi-unstructured grid. The structured grid can be of the irregular corner-point-geometry grid type or the simple Cartesian grid type. The semi-unstructured grid is really unstructured, formed by arbitrarily connected control-volumes derived from the dual grid of a suitable triangulation; but the connectivity pattern does not change from layer to layer. Problems with determining fluid movement and other state changes in the formation are solved by exploiting the layered structure of the medium. The techniques are particularly suited for large-scale simulation by parallel processing on a supercomputer with multiple central processing units (CPU's).

The invention discloses a method for generating a tetrahedron gridding for a three-dimensional geological structure, which is used for geologic body attribute modeling and oil-deposit numerical simulation computation and analysis. The invention is characterized in that an automatic reliable recovering method for geologic restrained boundary segments and layering gridding is supplied and the tetrahedron gridding under the restraining of inputting a three-dimensional geological structured model is generated, on the basis of a standardized settling for inputting a three-dimensional geological surface gridding model and the Delaunay triangulation gridding generating method based on a point set, and by utilizing a topologic principle and detecting constraint conditions and crossing conditions of the elements such as edges, sides and bodies in an antithetical Voronoi diagram of a Delaunay tetrahedron gridding as well as establishing a corresponding point adding rule. The method is easily realized, has high reliability and has no specific demand on complexity of an initial surface model and the classification of the gridding. By using the method, the problem of gridding the tetrahedron under a complex geological structure is solved, thereby being convenient to perform further analysis and simulation computation on the three-dimensional geological model on such a basis.

The present invention relates to a screen for screen printing. More particularly, the structure of the screen can have different types of mesh or sheets joined together. The present invention also relates to a method of detachably spreading a screen to a screen frame.

An irregular mesh mapping method used in electromagnetic field-flow field-temperature field coupling calculation comprises the following steps of 1 establishing a flow field-temperature field calculation model; 2 reading node coordinate values of discrete units of the model; 3 re-establishing a geometric model of a research object in the electromagnetic field calculation, performing model discrete to form a triangular finite element mesh and performing electromagnetic field value calculation; 4 mapping power consumption onto units in a temperature field; 5 obtaining a mapping correction factor; using power consumption densities of the units as loads to be loaded into the temperature field for solution and calculation, and obtaining a temperature result; accordingly obtaining the power consumptions of the units in the temperature field. By adopting the irregular mesh mapping method used in the electromagnetic field-flow field-temperature field coupling calculation, data transfer of different types of meshes can be adopted in different physical fields, the mesh number is greatly decreased, and the calculation time and the calculation accuracy are shortened and improved.

The invention discloses a method and a device for classifying a traffic zone, which relates to the traffic information field, and is characterized in that a classified traffic zone can accurately reflect the intrinsic traffic characteristics in real time. A scheme is as follow: a zone to be classified is gridded according to a real road network; communication record quantity of each base station in each grid is acquired within a first preset time period, and a quantity discrete value corresponding to each base station is obtained; sum-and-square difference comparison is conducted for the quantity discrete value of each base station and a preset group of characteristic curves, and a minimal error characteristic curve with the minimal sum-and-square difference of the quantity discrete value of each base station is selected; the corresponding base station with the same minimal error characteristic curve is classified into the same base station type; the quantity ratio of base stations of the same base station type is calculated in each grid; the type of the grid is determined according to the base station type with the maximal quantity ratio of the base stations in the grid; and the adjacent grids with the same grid type are merged to form a traffic zone. The method and the device are used for classifying the traffic zone.

The invention teaches a new way to make mesh bags using adhesive labels and continuous mesh tubing. Using adhesive labels on continuous mesh tubing is made possible by guiding the mesh tubing both on the outside of the tubing and the inside of the tubing so that an adhesive label does not stick to the mesh surface on the other side of the mesh tubing. As a result the invention also teaches a new type of mesh bag made with this process and a new machine used for making mesh bags.

The invention teaches a new way to make mesh bags using adhesive labels and continuous mesh tubing. Using adhesive labels on continuous mesh tubing is made possible by guiding the mesh tubing both on the outside of the tubing and the inside of the tubing so that an adhesive label does not stick to the mesh surface on the other side of the mesh tubing. As a result the invention also teaches a new type of mesh bag made with this process and a new machine used for making mesh bags.

The invention provides a method and device for solving a static thermoelasticity problem of an isotropic solid material. The method comprises the steps of establishing a numerical model of a to-be-solved structure based on material parameters, gridding scores, grid types and boundary condition information of the actual to-be-solved structure, and adding the material parameters and the boundary condition information to nodes on each unit of the numerical model; establishing strain and stress equations including a relation equation between the total strain and stress of the isotropic elastomer material and a stress equation; further, establishing a displacement integral equation; establishing an internal stress integral equation; converting domain integrals in the displacement integral equation and the internal stress integral equation into boundary integrals; establishing a solving matrix throughout the integral equation, and performing discretization and integration to obtain a matrixequation; and then, obtaining change data of the boundary and the internal point of the model by utilizing a Gaussian elimination solution method, and taking the change data as change data of the boundary and the internal point of the to-be-solved structure.

Generation of a mesh model that can be analyzed with sufficient analysis accuracy for result evaluation and within a minimum possible calculation time even if a user does not grasp a tradeoff relation between analysis accuracy and analysis time due to mesh size is made possible. A mesh generation system designates an evaluation point (site) on an analysis target shape, analyzes plural analysis model data created with plural types of mesh size, stores a relation among mesh size, analysis result and calculation time in a mesh know-how DB, search for a mesh size which meets a required accuracy and calculation time limit, sets the mesh size that is found by the search to an analysis model. And displays the relation among mesh size, analysis result and calculation time.

The invention discloses a mesh transfer-based antenna electromechanical coupling method, and aims to provide a quick and accurate antenna electromechanical coupling method. The method is implemented by the following technical scheme: a displacement of each node of an antenna structure after deformation is obtained by utilizing ANSYS Workbench software, calculation is performed to obtain static deformation of an antenna panel, a mesh file before deformation is read by adopting an ANSYS Mechanical APDL (ANSYS Parametric Design Language), then a deformation amount of each mesh node is calculated for each mesh node, a deformation amount of each node of a finite element model is added into an original mesh to obtain a mesh of the antenna after deformation, and then the mesh is updated and a mesh file of the antenna after deformation is output by utilizing the ANSYS APDL; a CDB mesh model is read by using an ICEM CFD module, a mesh type is converted into a PAT format, a mesh file in the PAT format is imported into Hypermesh software, and a surface mesh is extracted and output; and finally a surface mesh file is imported into electromagnetic analysis software to perform simulation, and simulated electric performance of the antenna is compared with electric performance of the antenna before deformation to obtain electromechanical coupling performance of the antenna.

The invention belongs to the field of information storage, and discloses a data storage structure and a data storage method of an unstructured grid, and the data storage structure comprises geometrical information and topological information of a grid unit, geometrical information and topological information of a grid surface, geometrical information and topological information of grid points, anda grid surface area; wherein the grid surface area comprises an internal grid surface area and a boundary grid surface area; the data storage structure of the unstructured grid provides a detailed spatial discretization solution for software development of computational fluid mechanics and computational structural mechanics, can support various grid types involved in numerical calculation of a finite volume method and a finite element method, and can also support simulation calculation of two-dimensional and three-dimensional problems at the same time; the data storage method is simple, the data volume can be simplified, the calculated amount is reduced, and the method has remarkable advantages in adaptability of complex geometrical shapes.

Embodiments described herein comprise a mesh flag with symbols or colors upon them for the purpose of portraying them. The unique design utilizing a mesh structure enables persons within close proximity of the mesh object to see through it.The Udafan would be made up of a mesh fabric that is flexible and can have any dimensions for size, as well as any dimensions for the mesh holes. The mesh should be of a size that allows persons at close proximity (as example 0-10 ft) to view at some level of visibility past the flag to more distant objects, places, or things. The type of mesh, the fabric, and the size of the banner are all variables that can be adjusted without deviating from the purpose of the invention. The Front surface of the Udafan would portray a symbol, flag, image, or sign of whatever the user wishes portrayed.

The invention relates to a three-dimensional model simplification method and device, computer equipment and a storage medium. The method comprises the following steps: acquiring target information of vertexes on a triangular patch in an initial three-dimensional model; traversing all triangular patches in the initial three-dimensional model, and determining the grid type of the triangular patches according to the target information of the vertexes on the triangular patches; the grid type comprises a two-dimensional manifold grid and a non-two-dimensional manifold grid; determining a common edge between the triangular patch of the two-dimensional manifold grid and the triangular patch of the non-two-dimensional manifold grid, and simplifying an edge to be simplified in the triangular patch of the two-dimensional manifold grid to generate a simplified triangular patch; and constructing a simplified three-dimensional model based on the simplified triangular patch and the triangular patch of the non-two-dimensional manifold grid. By adopting the method, the problem of surface breakage occurring when the three-dimensional model is simplified can be solved.

In one embodiment, the invention provides a method and an apparatus for generating a way in a map, and solves the problems that in the prior art, way distribution status cannot be clearly presented in an electronic map. The method includes the steps of: 1) acquiring navigation data of at least two users in a target zone in a map, the target zone including at least two grid units; 2) according to the navigation data, determining moving status of all users passing through every grid unit in the target zone, wherein the moving status includes walking status and driving status; 3) according to the moving status, determining the grid type of every grid unit, the grid type including walking grid and driving grid; and 4) according to the grid units, which are adjacent to each other and belong to the type of walking grid, in the target zone, generating a sidewalk way, and / or according to the grid units, which are adjacent to each other and belong to the type of driving grid, in the target zone, generating a lane way.

The invention teaches a new type of mesh bag suitable for machine packaging. The first end of the mesh bag is a reserved opening for filling and sealing. The second end of the mesh bag includes a one-pull, easy-open mechanism and a re-closing mechanism. The re-closing mechanism is a drawstring perforating around the second end of the mesh bag. The one-pull, easy open mechanism is a line of easy open stitches which sews a small strip of hard paper with the wall of the mesh bag at its second end. The two mechanisms can be pre-set in parallel or integrated in a same line with the small strip of the hard paper overlaid on the drawstring.

The invention belongs to the technical field of aircraft fire prevention and extinguishing, and particularly provides an aircraft cabin liquid fire extinguishing agent concentration simulation methodwhich comprises the following steps: 1) adding a physical field and a research type; 2) importing a geometric model of the cabin and simplifying; 3) carrying out simulation equivalence on a fire extinguishing spraying position; 4) setting a grid type and a grid size, and dividing grids; 5) setting a simulation model; 6) setting Haron fire extinguishing agent material parameters and initial boundary conditions; 7) initializing the system; according to the method, the fluid fire extinguishing agent spraying process is simulated through the finite volume principle, waste of manpower and materialresources in a traditional concentration test is effectively avoided, and cabin fire extinguishing agent distribution data obtained through the method have certain guiding significance in actual airplane cabin fire extinguishing system design.

The invention discloses a method for generating a tetrahedron gridding for a three-dimensional geological structure, which is used for geologic body attribute modeling and oil-deposit numerical simulation computation and analysis. The invention is characterized in that an automatic reliable recovering method for geologic restrained boundary segments and layering gridding is supplied and the tetrahedron gridding under the restraining of inputting a three-dimensional geological structured model is generated, on the basis of a standardized settling for inputting a three-dimensional geological surface gridding model and the Delaunay triangulation gridding generating method based on a point set, and by utilizing a topologic principle and detecting constraint conditions and crossing conditions of the elements such as edges, sides and bodies in an antithetical Voronoi diagram of a Delaunay tetrahedron gridding as well as establishing a corresponding point adding rule. The method is easily realized, has high reliability and has no specific demand on complexity of an initial surface model and the classification of the gridding. By using the method, the problem of gridding the tetrahedron under a complex geological structure is solved, thereby being convenient to perform further analysis and simulation computation on the three-dimensional geological model on such a basis.

Generation of a mesh model that can be analyzed with sufficient analysis accuracy for result evaluation and within a minimum possible calculation time even if a user does not grasp a tradeoff relation between analysis accuracy and analysis time due to mesh size is made possible. A mesh generation system designates an evaluation point (site) on an analysis target shape, analyzes plural analysis model data created with plural types of mesh size, stores a relation among mesh size, analysis result and calculation time in a mesh know-how DB, search for a mesh size which meets a required accuracy and calculation time limit, sets the mesh size that is found by the search to an analysis model. And displays the relation among mesh size, analysis result and calculation time.

The invention provides a numerical simulation analysis method for dynamic stiffness of a loudspeaker basin stand. The method comprises the steps of firstly building a finite element simulation model comprising the sub-steps of 1, adding a physical field and a research type; 2, building a geometrical model of the loudspeaker basin stand; and 3, setting the physical field; setting an elastic material model, damping, a constraint condition and a loading force in a solid mechanics physical field; 3, setting a material parameter; and 4, setting grid types and sizes, and dividing grids to generate afinite element model; then solving the finite element model by using a frequency domain analysis method; and at last, performing postprocessing to acquire a change relationship of the dynamic stiffness of the loudspeaker basin stand along with frequency. A distribution diagram of the stress, strain and displacement on the basin stand and frequency responses of the displacement amplitude, speed amplitude and acceleration amplitude of any point on the basin stand also can be acquired under the sinusoidal loading effect at any frequency.

A special-shaped grid mapping method in electromagnetic field-flow field-temperature field coupling calculation, the method includes the following steps: 1) establishing a flow field-temperature field calculation model; 2) reading node coordinate values ​​of discrete units of each model; 3) Re-establish the geometric model of the research object in the calculation of the electromagnetic field, discretize the model into a triangular finite element grid, and perform numerical calculation of the electromagnetic field; 4) Map the power loss to each unit in the temperature field; 5) Obtain the mapping correction coefficient; 6) Load the corrected power loss density of each unit as a load into the temperature field for calculation, and obtain the temperature result; thus, the power loss of each unit in the temperature field is obtained. The special-shaped grid mapping method in the coupling calculation of electromagnetic field-flow field-temperature field provided by the present invention can realize data transfer between different physical fields using different types of grids, greatly reduce the number of grids, and improve calculation time and accuracy .

According to the geometric model non-rigid matching method and device using local and global information, left and right symmetrical parts of the shape can be distinguished, and the accuracy of pointmatching is obviously improved. The method comprises the following steps: (1) inputting a pair of geometric models representing different postures of the same object, wherein the data type of the models is a grid type or a point cloud type; (2) calculating the density of each point in the model, and cutting the geometric model according to the density of the points; (3) matching the segments obtained by segmentation by using inter-segment errors and intra-segment errors to obtain a segment matching result; and (4) maintaining a model through local global exchangeability, the model including segment-related descriptor constraints and segment-related operator exchangeability constraints of the geometric object, and outputting a point matching result by using segment matching information.

The invention provides a simulation checking method for anti-overturning capability of an overhead distribution line electric pole, and belongs to the field of electric pole stability checking.The method comprises the steps that firstly, geometric dimensions of an electric pole and a foundation computational domain are determined, and a geometric entity model of the electric pole and the foundation is established based on ANSYS software; secondly, determining a grid type and a grid size, establishing an electric pole and foundation numerical value grid model, and importing the model into FLAC3D software; then, selecting a proper constitutive model and a yield criterion, determining physical and mechanical parameters of the electric pole and a foundation rock-soil body, and setting initial conditions and boundary conditions of calculation; and finally, in combination with an external load condition, completing simulation solution of the model based on FLAC3D software, and in combination with a solution result, judging whether the electric pole of the overhead distribution line overturns or not. The method is low in cost, short in time consumption and high in repeatability, can directly observe the deformation and damage process of the rock-soil body, can effectively simulate the actual process of anti-overturning checking of the electric pole, provides a basis for prevention and treatment of electric pole overturning, and improves the extreme weather handling capacity of an urban and rural power distribution network.

The invention provides an analogue simulation method for a flow channel of a throwing system of a green feed harvester. The method comprises the following steps that: three-dimensional modeling is carried out on components of the throwing system of the green feed harvester, boolean operation is carried out on the model, polyhedral hybrid grid division is carried out on the obtained calculation model, a grid type used for CFD calculation is output, the output grid is calculated through a finite volume algorithm, a numerical value of the output grid is obtained, post-processing is carried out onthe calculated numerical value, and a corresponding data curve and a cloud picture are obtained. According to the invention, a lot of test time can be saved, and test material consumption and personnel cost are reduced; and a designer is guided to carry out optimization design on the material throwing system model through a calculation result until the design requirement is met.

The invention discloses a method for predicting the dynamic stiffness of a rubber mount, which comprises the following steps of: importing a three-dimensional model of the rubber mount into finite element pretreatment software; carrying out grid division on the rubber mount by adopting a grid to obtain a grid model of the rubber mount; importing the grid model into finite element analysis software, and setting material attributes; setting an analysis step; setting a contact step, loading preloading force, and setting constraint; assigning a grid type; and submitting operation to obtain a frequency-counterforce value, and obtaining the dynamic stiffness according to the frequency-counterforce. The error between the dynamic stiffness amplitude of the rubber mount dynamic stiffness simulation analysis curve and the actual test curve and the corresponding frequency is within 15%, and the error is small, so that the method is feasible and has certain engineering value and economic value.