Study On Quick FEM Of Shell And Deck Plate Girder Structure

To create a FEA(Finite Element Analysis) model usually undergoes these steps as follow: node creation, element generation, property entrusting, loads and boundary conditions adding, with the preceding three steps more strenuous and arduous among them. To counter the three steps, the thesis studies a method to create the FEM (Finite Element Model) of shell and deck quickly. The basic train of the method is as this-Firstly, based on the open system, AutoCAD, taking the advantage of VBA, a powerful re-exploitation tool of AutoCAD, to get 3-D FEM data of shell and deck structure from basic 2-D drawings such as folded shell drawing and deck drawing of hull, and to output FEM data files. Secondly, based on Patran, a large-scale FEM pre-process software to write data interface programs and transfer FEM data to FEA (Finite Element Analysis) model of Patran, by using PCL, the re-exploitation language of Patran.The whole article contains six chapters, which are Introduction, Brief Account of Developing Platform, Calculation of FEM Data, Realization of Data Interface Programs, Application Examples of Software and Summary and Prospect. The first chapter mainly introduces the basic knowledge about FEM, the development and the present condition of FEM of hull structure, and also introduces the main work in this research. The developing platform AutoCAD and Patran, together with their re-exploitation tools, are stated in chapter two. The third chapter tells about how to calculate and produce FEM data depending on 2-D hull structure drawings, including: introduction of main drawings, mesh generation method, mesh curve disposal, data-type definition, frame molded line and shape database creation, calculation methods of every FEM data and data files outputting. In chapter four, the realization of the transformation from FEM data to FEA model of Patran is presented. The introduction is divided into parts such as data files opening, data reading, node producing, element establishing, property entrusting and so on. In the fifth chapter, two application examples are given, and the effect of application is analyzed. Finally, a summary of the thesis is made, and a prospect for the future work is given.A program has been developed according to the research. The application results prove that this method is feasible and the program is fairly practical.