37 results about "Mesh geometry" patented technology

A method of constructing an enveloping mesh geometry (EMG) for a plurality of sample mesh geometries (MG). The enveloping mesh geometry is a geometric representation of the mean of the probability distribution underlying the sample space from which the enveloping mesh geometry (MG) have been drawn. The method is based on estimating probability densities f_j using the kernel density method. The method further comprises constructing, based on the enveloping mesh geometry (EMG) so constructed, further enveloping mesh geometries (EMG-α) related to the α-Quantiles of the probability distribution. The enveloping mesh geometries (EMG, MG-α) are suitable for development and test procedures in aircraft and automotive manufacturing processes.

The invention relates to an arrangement and a corresponding planetary gear for increasing the rotation speed including a sun wheel (12), a gear rim (10), a planet gear (14), a power input shaft (46), and a planet carrier. A construction (40) allowing flexing is placed between the support length (f) of the first fastening end (62) of the shaft (20) of the planet wheel (18) and the closest bearing for dynamically adapting the mesh geometry.

The present invention discloses a method of evolutionary optimization algorithm for structure design which comprises steps of: meshing a geometric structure with applied geometric boundary conditions; analyzing the meshed geometric structure by finite element analysis to determine the relative stress distribution of the structure; and evolving the geometric structure by migrating geometric boundary nodes. During evolution, meshing and finite element analysis are repeated to perform structural optimization evolutionally till the evolving design converged to an optimum. The present invention overcomes the mesh-dependency problem in most of structural optimization algorithms in the field of structure topology optimization. In addition, the optimized design of the present invention possesses smooth geometric boundaries. Moreover, structure topology resolutions can be controlled and capable of producing designs that are very close to exact theoretical analysis.

A process, computer program product, and apparatus provide color and shape stylization for a captured hairstyle. The process, computer program product, and apparatus receive a plurality of images of a hairstyle in an n dimensional space at a plurality of different angles. Further, the process, computer program product, and apparatus generate a mesh surface in an n−1 dimensional space. In addition, the process, computer program product, and apparatus combine color data from the plurality of images at the plurality of different angles with mesh geometry data of the mesh surface. The process, computer program product, and apparatus also stylize the color data with an n dimensional filter that projects the color data to the n−1 dimensional space of the mesh surface. The process, computer program product, and apparatus may also stylize the geometric shape details in a coherent manner with the color.

Method for generating a 3D grid, and for defining a material property model on the grid, to use, for example, in a reservoir simulator. A mapping is defined (61,71) to a design space in which the material property is described as a piecewise smooth implicit or explicit function in three dimensions. Grid geometry is constructed only in the physical space of the model (62-65,73-76), and no grid is required in the design space. The material property, for example permeability, is sampled in the design space (66,77) to populate the cells in the grid constructed in the physical domain. Prismatic grid cells may be truncated based on faults and horizons (65), or maybe conformed to fault surfaces using a 3D parameterization of the model (76). Only forward mapping, i.e. from the physical domain to the design space, is required.

The invention discloses a multi-block structure grid data compression and storage method. The method comprises the following steps: extracting block information and grid geometric data of a pluralityof block structure grids; outputting the number nblocknum of the grid blocks to a file; extracting logic surface information and logic surface geometric data of six logic surfaces of a single grid block; sequentially outputting the logic surface information and the logic surface geometric data of the six logic surfaces of the single grid block to a compressed file, and completing output of the logic surface information and the logic surface geometric data of the single grid block; and completing output of logic surface information and logic surface geometric data of all grid blocks of the plurality of structural grids, and generating a compressed storage file of the plurality of structural grids. According to the method, the logic surface information and the logic surface geometric data ofthe single-block structure grid are extracted, the geometric data of the original grid are encoded and compressed, and then the logic surface information and the logic surface geometric data of the grid are stored, so that the storage space of the grid data is reduced, all grid geometric data can be recovered in a lossless manner, the storage space is small, and the storage efficiency is high.

Embodiments of the present disclosure provide a grid creation method and apparatus, and a distribution method and apparatus. The mesh building method comprises the following steps of: determining attribute information of a mesh geometric unit according to characteristics of a geographic region, and filling the geometric region with the mesh geometric units adjacent to each other; at least two meshes being obtained by dividing the geographic region composed of the mesh geometric elements adjacent to each other according to a preset mesh division rule; generating a mesh geometry cell identification of the mesh geometry cell and a mesh identification of the mesh; based on the mesh geometric unit identification of the mesh geometric unit and the mesh identification of the mesh, the corresponding relationship between the mesh geometric unit and the mesh being established, thereby saving the tedious operation of manually selecting points to construct a mesh, improving the efficiency of constructing a mesh, and saving a lot of labor costs. The mesh geometric unit identification of the mesh geometric unit and the mesh identification of the mesh are used to establish the corresponding relationship between the mesh geometric unit and the mesh. Moreover, each mesh geometric element is adjacent to each other, thus solving the problem that the mesh has gaps and providing a solution for 100%coverage of the business.

The coupling of geomechanics to reservoir simulation is essential for many practical situations in the exploitation of hydrocarbons. Such coupling requires cross-mapping block-centered data in reservoir model to nodal data in geomechanical finite element model. If different grid geometries and grid densities between two models are used, this data mapping will become considerably challenging. In this invention, an innovative method is proposed to achieve remarkable accuracy of data mapping from reservoir model to the geomechanical model with ease and quite efficiently using least squares finite element method. The achievement of accurate data mapping will enable efficient simulation coupling between reservoir simulation and geomechanical simulation to investigate some engineering problems in the exploitation of hydrocarbons.

An inverted tooth chain and sprocket drive system in which the initial contact distance ICD, the meshing impact angle Sigma (s), the link plate entrance angle Beta (ss), and other aspects of the meshing geometry are controlled and optimized to reduce noise and vibration by using a particular chain link plate form and, in preferred cases, by modifying the sprocket tooth pressure angle. The system can include first and second sprockets for which the pressure angle can be controlled to ensure that the desired values for the initial contact distance ICD, the meshing impact angle Sigma (s), and the link plate entrance angle Beta (ss) are equal for both sprockets even though the sprockets have different tooth counts. For a chain pitch P in the range of 6.35mm to 7.7mm, the initial contact distance IC0 is controlled such that 0.49P = IC0 = 0.53P, the meshing impact angle Sigma (s) is controlled such that s < 34 DEG , and the link plate entrance angle Beta (ss) is controlled such that ss = 9 DEG . For certain chain and sprocket configurations, s < 31 DEG and ss < 7 DEG .

The invention discloses a system and a method for numerical simulation based on a Lagrange integral point finite element. The system for numerical simulation comprises: a modeling module which is usedfor sequentially generating a calculation domain, a calculation grid, a geometric model and a physical model according to data inputted by a user, and storing numerical model data; a solver module which is used for receiving the numerical model data, establishing a unit matrix and a large sparse total stiffness matrix according to input geometric physical parameters and boundary conditions, performing total numerical calculation and local calculation, and storing and outputting a simulation analysis result; and a post-processing module which is used for drawing a cloud chart and a curve chartaccording to the output simulation analysis result, and storing text data. Finite element analysis of fluid and incompressible materials can be carried out, the calculation efficiency is greatly improved, and the calculation cost is reduced.

The invention discloses a structured grid division method for a rod bundle assembly with a wire winding function. The method comprises the following steps: building a three-dimensional geometric modelof a flow channel of the rod bundle assembly with the wire winding function, and dividing the three-dimensional geometric model into a near-rod channel containing a wire winding feature and a main flow channel not containing the wire winding geometric feature; establishing a two-dimensional plane topological structure for the flow section of the near-rod channel, setting grid node parameters, dividing a two-dimensional structure grid, and performing rotary stretching to obtain a three-dimensional structure grid of the near-rod channel; dividing the flow cross section of the main flow channelinto two-dimensional structure grids and stretching to obtain three-dimensional structure grids of the main flow channel; and finally, splicing the three-dimensional structure grids of the near-rod channel and the main flow channel to finish the structure grid division of the rod bundle assembly with the winding wire. According to the method, the problems of low geometric reduction degree, poor grid quality, difficulty in controlling the number of grids and the like of non-structural grids of the rod bundle assembly with the winding wires are solved; meanwhile, the number and distribution of grids are easy to adjust, and high-quality grids can be provided for CFD calculation of the rod bundle assembly with the winding wires.

The embodiment of the invention discloses a finite element grid geometric structure contour recognition method and device and a medium. The method comprises the following steps: acquiring three-dimensional geometrical characteristics of a plate shell structure part from CAE software; projecting the three-dimensional geometric features to a maximum plane in the three-dimensional geometric features to obtain two-dimensional geometric features; determining a two-dimensional convex hull of the two-dimensional geometric feature as a contour point loop of the two-dimensional geometric feature; sequentially determining and inserting missing contour points between each contour point and the next contour point in the contour point loop along the direction of the contour point loop to obtain a final contour point loop; wherein the direction of the contour point loop comprises a clockwise direction and an anticlockwise direction. According to the embodiment, the contour of the complex geometric feature is automatically identified.

The invention relates to a method for transferring a stress state of an FE simulation result to a new FE mesh geometry of a simulated construction system, such as a component for motor vehicles that has a 3-D shape, in a simulation chain of production operations, comprising: a) providing a first data set, which describes the FE simulation result with a stress state of the FE simulation of the construction system or component of a first production operation, b) creating the new FE mesh geometry of the simulated construction system or component, which new FE mesh geometry is associated with a second production operation, c) transferring the stress state of the provided first data set to the new FE mesh geometry of the construction system or component, d) performing an equilibrium calculation by using the stress tensor in the FE mesh geometry, wherein deformation of the construction system or component results, which deformation differs from the deformation in the FE mesh by a shape alteration u>tolerance value ε, e) iteratively repeating the equilibrium calculation as a cyclic equilibrium iteration in the new FE mesh geometry (in the new target FE mesh) of the construction system or component, wherein, in each cycle, a new stress state is applied to the FE mesh geometry of the construction system or component and stress components that lead to undesired shape alterations are decreased until a displacement/termination criterion of shape alteration u<tolerance value ε is achieved, and f) displaying the fulfilled condition of u<ε.

The invention provides an interactive self-penetrating grid deformation method based on proxy geometries, which comprises the following steps: generating a corresponding proxy geometry according to manually selected patches on active collision grid geometries; taking the proxy geometry as an active collision geometry, and recording the initial three-dimensional space position of the active collision geometry as an initial position, wherein the vertexes of the surface patches, facing the direction of a passive collision geometry, of the proxy geometry emit rays towards all directions, and interpenetration calculation is carried out between the vertexes and the passive collision geometry; and when interpenetration is calculated, recording the three-dimensional space displacement of the active collision geometry, and applying the displacement to the vertexes of the surface of the passive collision geometry, so that a real-time deformation process is realized. The limitation of a self-penetrating problem is effectively and reasonably avoided, and the calculation speed is greatly improved.