A Method of Editing and Optimizing CAD Body Mesh Model Based on Feature

Abstract

The invention discloses a feature based CAD mesh model editing and optimizing algorithm, which comprises the CAD mesh model editing and the CAD tetrahedral mesh model optimizing, both based on features. In editing, a user can select a set of surface areas that need to maintain the shape features of the model, and edit the model by operating the areas through translating, rotating, and etc. In optimizing, according to the region of model change, firstly, the tetrahedral mesh units with poor quality are evaluated; corresponding topological optimization operations are carried out to these units and finally the mesh smoothing operation is carried out. The whole optimization process is iteratively carried out so as to obtain optimized mesh model data. The algorithm of the invention can directly edit and optimize a finite element mesh model, and can exactly retain the original features of the model, making it fully meet the application requirements of relevant industrial fields.

Description

technical field [0001] The invention relates to the fields of computer-aided design and finite element analysis, in particular to a method for editing and optimizing CAD body mesh models based on features. Background technique [0002] Computer-aided design technology (Computer-Aided Design, CAD) refers to the technology that uses computers as auxiliary tools to help designers in the engineering field design products. It can effectively accelerate the speed of product design analysis, improve manufacturing efficiency and precision, and improve economic benefits. With the help of computer-aided design technology, engineers and technicians can realize "paperless" operations, and use the help of computers to efficiently complete product analysis, design, drawing and manufacturing. Using computer-aided design technology, while saving resources and reducing design costs, it also greatly speeds up product design and improves product quality. The Boeing Company of the United Stat...

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Problems solved by technology

However, most of these methods are aimed at surface mesh models, and there are relatively few related research works on the editing of volume mesh models

In addition, the applicable objects of these methods are basically graphics models and animation models, and most of the considerations are visual problems such as smoothness and detail before and after editing, although these methods can achieve better results for the deformation of many models , but the CAD models of mechanical parts in industrial applications often have many sharp features, and also have some local shapes with editing semantics. It is difficult to guarantee the semantics and features before and after editing by directly applying these existing methods

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