Fusion and Optimization Method of Mesh Model of Ship and Wake

An optimization method and grid model technology, applied in design optimization/simulation, 3D modeling, instrumentation, etc., can solve the problems that the fusion results of positioning accuracy are greatly affected, and it is difficult to determine the fusion boundary.

Active Publication Date: 2020-05-12
FUDAN UNIV
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Problems solved by technology

This type of method needs to specify an accurate boundary, and the positioning accuracy of the boundary has a great influence on the fusion result; however, it is often difficult to determine the precise fusion boundary for the splicing of large-scale complex overlapping areas

Method used

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  • Fusion and Optimization Method of Mesh Model of Ship and Wake
  • Fusion and Optimization Method of Mesh Model of Ship and Wake
  • Fusion and Optimization Method of Mesh Model of Ship and Wake

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Embodiment Construction

[0060] The method of finding the intersecting area of ​​the sea surface The intersecting area of ​​the sea surface is a circle of points that make up the bottom of the ship. Since their z coordinates are close to each other, the z coordinates of these circles are ignored, and they are approximately regarded as two-dimensional points. These points are connected in turn to form a polygon, which is called the bottom polygon, such as figure 1 Indicated by the gray solid line. Scale the bottom polygon of the ship to get two similar polygons, one large and one small, respectively, such as figure 1 Shown in black solid line (large) and black dashed line (small). Clipping the part of the sea whose coordinates are between two polygons is used for precise fusion.

[0061] figure 2 is the rotation of the 3D point cloud: r is the rotation axis, and α is the rotation angle. The subdivision is completed in two steps: First, rotate all scattered points on the same plane counterclockwise...

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Abstract

The invention belongs to the technical field of ocean remote sensing monitoring and specifically a ship and wake mesh model merging and optimization method. The invention relates to computational fluid mechanic and computational electromagnetic technologies. The method comprises the specific steps of (1), determining an overlapping area of the ship model and the wake model through utilization of prior knowledge for ship and wake models; (2), solving intersection points of triangular surface elements of the ship model and the wake model in the overlapping area; (3), carrying out two-dimensional Delaunay partition on a scattered point cloud, thereby obtaining an initial mesh merging model; and (4), eliminating deformed triangular surface elements, thereby optimizing the mesh model. The merging test of a series of complicated models indicates that the algorithm provided by the invention is applied to the fusion of the mesh models of ship and rough sea surface, and ship and wake with different mesh densities and different structures. The algorithm can be operated stably without an additional condition, the number of the mesh units is reduced, and the deformed triangular surface elements are removed completely.

Description

[0001] field of invention [0002] The invention belongs to the technical field of marine remote sensing monitoring, and in particular relates to a fusion and optimization method of grid models of ships and wakes. Background technique [0003] Triangular surfel meshes are often used in numerical modeling, and are widely used in many fields such as computational fluid dynamics and computational electromagnetics. The triangular mesh modeling of a single model has been engineered, and there are a large number of mature software from mesh generation to optimization. However, in some fields, it is often necessary to splice and fuse any two or more grid models to generate an integrated grid for subsequent numerical calculations. The junction of different models is generally the coupling area of ​​the physical field. Therefore, in order to ensure the accuracy and stability of the calculation, there are often higher requirements on the shape of the cells at the mesh junction. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06T17/30
CPCG06F30/20G06T17/30
Inventor 丁娟娟苏欢孙玉鑫刘鹏任维君
Owner FUDAN UNIV
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