881 results about "Grid partition" patented technology

The invention relates to a grid thunder-threat distribution confirming method. The confirming method adopts a computer to process thunder automatic monitoring data and establish a databank, and adopts a grid method to carry out statistical analysis to the thunder parameter while taking a geographic information system and the databank as an analysis platform, and then adopts the computer to carry out the statistical analysis to the thunder data according to typical criterion so as to obtain the thunder-threat distribution of corresponding objects. The method has the following basic steps: firstly, the thunder automatic monitoring data is stored in the databank by the computer; then grid distribution is carried out to selected zones on a digital map; the data of each grid is analyzed statistically to obtain the statistical thunder parameter; and then the current-amplitude value of threatening thunders which can cause the flashover of insulator strings of power transmission lines is adopted as judging evidence according to a grid insulation structure to make the statistical analysis to the attribute of the thunder current-amplitude value and eliminate the useless data; special attribute data of happened flashover accidents caused lightning-strike on the power transmission lines is stored in the computer; finally, the computer is used for figuring out corresponding geographic distribution layers so as to obtain the grid electronic thunder-threat distribution chart. The method has the advantages that the method is easy and intelligible with better operability and practicability.

A curved surface meshing method is provided. The method meshes a three-dimensional curved surface by meshing a parameter plane, mapping triangles generated on the parameter plane to triangles in a three-dimensional space to get a 3D meshed curved surface. The method may generate substantially well-proportional distributed triangles on curved surfaces of three-dimensional models of objects.

The invention discloses a grid partitioning method which comprises the following steps: partitioning a point module and a linear module, and distributing points in the point module and the linear module; partitioning a horizontal two-dimensional plane into at least one independent region, and carrying out point distribution on the independent region according to a radial distributing rule; removing mutually-overlapped points; partitioning the points so as to obtain grids; after invalid grids are deleted, setting all the remaining grids as two-dimensional variable PEBI (perpendicular bisection) unstructured grids; and carrying out vertical expansion on each grid until the expanded grids are three-dimensional variable PEBI (perpendicular bisection) unstructured grids. By applying the schemedisclosed by the invention, when point distribution is carried out on the independent region, the point distribution is implemented according to the radial distributing rule, and the radial distributing rule is as follows: according to the value of distance between a distributed point and a well point in the independent region, the grid scale of the distributed point is increased, then the added value of the grid scale of a point adjacent to the distributed point is gradually increased, and the grid scales of the points (the distances between the points and the well point in the independent region are same) are same. Through using the point distribution mode, the number of the points in the independent region is reduced; and when grid partitioning is carried out on the points, the number of the grids is reduced, the calculation efficiency is improved, the calculation time is shortened, and the user burden is reduced.

The triangular mesh generating portion divides the surface of geometry model to be meshed in a meshed manner according to a target element dimension and generates a triangular mesh on the surface of geometry model. The regular mesh generating portion assumes a shaped parallelpiped enclosing the shape to be meshed. The parallelpiped is divided in a meshed manner by the hexahedral element whose distance between the nodes has the substantially same density as the triangular mesh on the surface. The resulting regular mesh located inside the triangular mesh on the surface of geometry model is divided into a tetrahedral meshed manner. The shell meshing area extracting portion extracts a shell-like space between the inner tetrahedral mesh and the triangular mesh on the surface of geometry model. The shell mesh generating portion generates the tetrahedral mesh in the overall shape to be meshed.