| The light-weight design of truck had many advantages, such as raising burning efficiency of fuel, improving transportation efficiency, and lowering rolling resistance. Hence lightening the frame dose a lot to bestead the Fuel Economy, Controllability and Stability of vehicle and Vehicle passive safety issue. Europe has already started to research on truck of light-weight design. In 2008, China Innovation Alliance started to run the task which is truck of light-weight design. The domestic alliance which is built by auto-mobile assembly factory, universities, Research institutes and material manufacturers are at the situation of China's own-brand car enterprises are under a big pressure at the domestic market. This indicates that R & D stage into the real paper.With the development of freight transportation market, the market competition becomes regulated and rational, trucks over loading become less and less. Currently; there are many approaches for truck owners to acquire profits such as improve transport efficiency, no more count on over loading. Ever before, trucks over loading and over strength frames become a limitation which restricts loaded freight wagons; those are gradually faded out the market. Therefore, it is necessary to reduce the frame weight by optimum design.The frame as one of important underlaying components on the vehicle, one hand it loads power assembly and goods, the other hand it loads force and moment from the road. The customer and manufacture are focused on the reliability of the frame. In the traditional design, in order to achieve the required strength, the frames are designed by heavy and consume a great deal of steel. This text will show how to reduce the frame's weight by using Optimization Design, at the same time, insure the performance parameters are satisfied the using requirements.The optimized design mentioned in this article adopts finite element method. The Hypermesh software was used for analysis and solution of vehicle frame's static analysis. This researching task aimed at vehicle frame and all of the assembly structure's calculation and analysis of dynamic and static characteristics, and optimized design of structures. The finite element theory, optimized design method which based on finite element, and topology optimized theory are used in this article's research. Using these theories and methods is to realize the light-weight design of structure, which achieved the performance design requirements premises in advance. Adopting advanced design theory and method in design of vehicle frame and components, and utilizing mechanical characteristic of materials could avoid blindness of structure design and realize rationalization and light-weight of structure design.The whole optimized design process talked about above includes four main steps listed below.First of all, establish the former of existing frame, actualize frame system's optimized design and bring forward light-weight improving methods using finite element method.Secondly, calculate frame's structure under diversified load using finite element analysis method, analysis frame's intensity and simulate frame's dynamic and static characteristics.Thirdly, make sample and test the characteristics according to analysis result. Also make use of patch for measuring frame's stress and strain evolution in real using process, then compare with the analysis result.Fourthly, optimize the process and result of original calculation and analysis by compare of academic calculation and testing result. Then make light-weight frame design criterion for academic gist of product exploitation in order to enhance product exploitation's efficiency.This article's research conclusion achieves the goal of reducing frame's self-weight, establishes the basic analysis steps of truck frame light-weight design, and also establishes the system working criterion of product exploitation. The calculation process using Hypermesh software also was showed in this article, which settles the basic of relative product exploitation. |
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