Study & Implementation On Visual Hydro-structure Analysis System For 3D Reinforcement CAD System

Visualization techniques on structural analysis are widely used in industry applications, such as hydro-structure, architecture, automobile, and shipping. The effective integration of structure design and visualization on structure analysis is very important to the efficiency and quality of design. The traditional hydro-structure design process is of low efficiency because 3D hydro-structure model design, structure analyzing, reinforcing steel bar designing and graphing are different isolated systems. In order to improve the efficiency of design, a visual hydro-structure analysis system for 3D reinforcement CAD system is developed in this paper. This system is developed to visualize the analytical result of any cross-section of the 3D hydro-structure model. The traditional method for cross-section generation which computes the intersection by traversing searching mesh of model is time-consuming. An oct-tree space segmentation based algorithm for cross-section generation is proposed in this paper. Compared with the conventional traverse searching algorithm, the proposed method is proved to be able to save much computing time, thereby is more efficient. In order to visualize the analytical result of cross-section, the mesh cell structure of cross-section and the topology relationship of these cells must be constructed. A new algorithm for cross-section triangularization is proposed based on the structure feature of tetrahedron mesh cells of 3D model. Considering the feature that there are common points and lines between the adjacent triangular cells, an algorithm for setting up topology relationship of triangular cells of section is proposed. And by the arithmetic, the data needed for drawing isoline map and nephogram is provided. The conventional way for visualizing the analysis result of cross-section is drawing isoline map or nephogram. Considering the actual need of hydro-structure design, one algorithm for drawing isoline map or nephogram is proposed in this paper. Compared with other algorithms, this algorithm is easy to implemente, and the increase of series of isoline will not result in the observable increase of the time for computing the isoline. Based on the above study, a visual hydro-structure analysis system for 3D reinforcement CAD system is developed with VC++ 6.0 and OpenGL. As a sub-system, this system is integrated into the 3D integrated reinforcing bars CAD system for hydraulic architecture, thus realized the whole integrated system of 3D hydro-structure modeling design, structure analyzing, reinforcing steel bar designing and graphing. The system has been successfully applied in hydro-structure design, and the design efficiency is improved by 10%.