Research And Application On Top-down Technology In High-speed Carbody Design

The design of high-speed carbody is featured with complex referencing relations, massof design data, large numbers participaters and frequently model modified. Top-down designcan adjust to above-mentioned features in origin effectively. However, engineer with richexperience can only ensure data transfer of this method smoothly. And the business transfermay lead to the loss of experience design causing the waste of enterprise resource and theserious affection to product design cycle. Therefore, it has been an emergency to develop ahigh-speed carbody design system based top-down technology which could increase productdesign development speed and achieve series design.Taking a high-speed carbody as an example，in this thesis, a car-body design templatewhich intergrated enterprise design specification and optimal practical experience is builtbased on the top-down design method and the parametric variant technology. Thecorresponding high-speed carbody design system has been developed based Windows system,which used Pro/Toolkit and Database management technology under the Visual C++.Netdevelopment environment and built on the platform of the Pro/E wildfire3.0. The main issuesin this thesis are investigated as follows:(1) The key technologies of top-down design system are analyzed including the assemblymodel based top-down design, variant design based parametric technology. and the methodsof Pro/E secondary development, which proved the theoretical and methodological foundationfor the realization of high-speed carbody design system.(2) The framework of the system has been built based on the high-speed carbodystructural features as well as the system requirements are analyzed in detail. Then，keytechnologies of system implementation have been discussed such as creating a parametricdesign template based on TBS model, building an Access database of design parameters anddeveloping application program which including the system interactive interface, databaseaccess and parameter-driven.(3) The availability of the system has been verified successfully by taking a X-model asan example. The result indicates that the system can build new models rapidly satisfyingdesign requirements, which realized the series design.The system has effectively integrated optimal practical experience. It has accomplishedthe collaborative design and improved the design efficiency and the model quality as well,which has a great value of practicality and potential replication. This proposed method can be used to other design of high-speed carbody with similar structure.