Researches On Fundamental Technologies Of Finite Element Pre-processing Based On STEP/SDAI--Information Extracting And Model Render

In recent years, The Finite Element Analysis (FEA) method has been employed hi industry more and more widely. It helps the corporation to reduce cost and shorten the time of product development. The FEA session consists of three main stages, namely the pre-processing stage, the solution stage, and the post-processing stage. The pre-processing stage includes geometry and model definition, specifying boundary and initial conditions and mesh generation. The geometry and model definition is the basis of other two processes.The research of this paper is mainly about the information exchange and solid re-display. The main idea of this paper is to find a way to reduce the work of development of solid modeling for FEA software by exchanging information with CAD software. There are two prerequisites to this research: One is that the CAD software hi market can provide excellent solid modeling functions; The other is that the widely adopted standard STEP can help us to easily exchange information with CAD software.The main researches hi this paper include:1. Studying and implementation of the advanced boundary representation in STEP/AP203;2. Studying and implementation of the Standard Data Access Interface(SDAI) hi STEP. In this paper, the SDAI is implemented by the early binding of C++. An early binding base class Library named SCL and a schema translator is developed successfully hi this paper;3. Re-display of the solid by OpenGL using the solid's geometry and topology information extracted from SDAI. This paper adopts the NURBS to represent all lands of surfaces and uses the OpenGL to display all the solid's faces.This paper has successfully realized the information exchange with CAD software and solid re-display. The SDAI also unproved the FEA software's portability by hi using different storage systems.