Study On Design Methodology Of Vehicle Body Structure Framework

The developing process of automobile industry in China generally follows the vehiclebody reverse development and the traditional forward development methods. Reversedevelopment is the early development techniques of the automobile industry, and we canlearn and absorb foreign technology development, design techniques to avoid vacancies andblindness. But the reverse structural defect itself may result that the new developed structureis not optimal and does not meet the requirement of its own regulations and market. Andreverse technology has some limitations, so there is a certain deviation between the newstructure and the reverse, affecting the structural performance. The traditional forward methodmodifies the structure to lightweight the body under the premise of preserving the previousgeneration models, meeting the requirement of regulatory and market. This method cangreatly shorten the development cycle and reduce cost. However, the traditional forwarddevelopment belongs to the later stages of the structural design. Because the space of designmay be inadequate, the defect of structure cannot be changed fundamentally. Overa ll, thereverse development and the traditional forward development methods cannot meet therequirement of automotive industry nowadays. We must develop a new vehicle body designmethodology to achieve the goal of shorter development cycles, excellent performance, highdegree of lightweight.As the future development trend of vehicle body, implicit parametric modeling of thewhole vehicle body is based on the multi-objective performance analysis early in the designof body to determine the optimal structural parameters of the models. Vehicle bodyframework is the main part of the body, and how to get a high-performance and high degreeof lightweight early is the most crucial step of the development process. Under thisbackground, study on the performance-driven vehicle body framework design for the wholebody forward parametric design, and present the technology roadmap of the research on thevehicle body framework structure design. On this basis, establish the structural performanceevaluation system, the implicit parametric model of the critical vehicle framework structureand build automotive optimization integrated platform on iSIGHT software platform. Under the premise of performance, achieve the optimal structure through the design of vehicle frameshape structure and the key cross-sectional shape driven by the performance. Present theinitial database management of the vehicle body framework to achieve developing vehiclebody rapidly, reducing labor cost and time. Discrete section of the feasible region and implicitparametric technology can change optimum design into searching the best positions of thecontrol points in the feasible region, driven by performance, and satisfying the conditionsrequired by the sectional shape.In this paper, study the design methodology of vehicle body structure framework,considering the performance evaluation, parametric modeling techniques and the applicationof performance-driven design platform, to obtain the optimum vehicle body structureframework before the detailed design stage. The new method of model parameters is of greatimportant reference to the future design.