Car body light-weight design method

Abstract

The invention relates to a car body light-weight design method. The method comprises the steps of building a car body finite element model; 2, building a car body modal, bending and torsional rigidityanalysis model, and calculating and obtaining modal, bending and torsional rigidity values; 3, building a sensitivity analysis model and performing solution calculation; 4, performing finishing according a sensitivity analysis model calculating result, obtaining a sensitivity analysis result of a car body metal plate corresponding to the design variable; 5, building a car body light-weight optimizing calculation model, and performing solution calculation; 6, performing extraction on the calculation result, and modifying a thickness value of some metal plates so as to meet the requirement forengineering, and forming a novel BOM table; 7, judging whether the BOM table reaches a light-weight design target or not, if yes, completing designing, and if not, repeatedly executing the step 6 tillthe light-weight design goal is reached. Compared with the prior art, the requirement for the car body rigidity is met effectively, the car body weight is lowered, the high engineering practicabilityis achieved, and the applicability is high.

Description

technical field [0001] The invention relates to the technical field of lightweight automobiles, in particular to a lightweight design method for a vehicle body. Background technique [0002] According to statistics, for every 10% reduction in the total mass of a car, fuel consumption can be reduced by 6% to 8%, and emissions can be reduced by 5% to 6%. The body is an important part of the car, and its weight accounts for about 40% of the weight of the whole vehicle. The impact on vehicle development is of great significance. [0003] The lightweight design of automobiles has become the development direction of today's automobile industry. Automobile lightweight design is to achieve lightweight under the design goals of modal frequency and stiffness. It is the most effective and important design in the early stage of vehicle development. Traditionally, increasing part thickness to increase body bending, torsional modal frequencies and stiffness is counterproductive. Furth...

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Problems solved by technology

[0004] However, at present, during the project process, when the engineers carry out the lightweight optimization design of the vehicle body, due to the large number of body sheet metal parts, the processing of the sensitivity results and the lightweight design bring a huge workload, and the optimization analysis results are subject to the engineer's experience , different optimization results will be obtained due to the choice of engineers

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