The Study On 3d Parametric Cad System Of Passenger Train Body Steel Structure

With the development of three-dimensional graphic technique and computer technique, three-dimensional design has been already inevitable tendency of CAD application. At present , the application of three-demensional CAD technique on passenger train design mainly focuses on three-demensonal solid modeling finite element analysis building standardized component library, and so on. Overall three-demensional design on the whole passenger train is at the stage of searching. This thesis develops three-demensional parametric CAD system on the steel structure of passenger train body. It not only improves design efficiency and design quality, but also has certain practical value and referenced signficance for the finite element analysis of products. This also fits in with development require of modern technique.This thesis is three-dimensional parametric CAD system on the steel structure of passenger train body, which is developed and runs on Windows 2000 platform. It is secondary development to Pro/ENGINEER by using Pro/TOOLKIT, and VC++6.0 is used as a compiler. This thesis analyses the system, and divides parameter design modular to three submodulars, which are overall design modular component design modular and part design modular. Each modular has own submodulars. Design objects > design parameters and models are classfied by using object-oriented technique. The thesis puts forward two ways to realize parametric design, which are building parametric model library and parametric assembling models. It builds parametric part model library and assembly relation model library by using Pro/ENGINEER, and realizes parametric assembling model in the Pro/TOOLKIT application program. Secondary development technique onPro/ENGINEER is studied, and extended functional function library is built. A user-friend interface is developed by using VC++6.0 as developing tool.