Upper vehicle body structure optimization method based on MDO technology

Abstract

The invention relates to an upper vehicle body structure optimization method based on an MDO technology, and the method comprises the following steps: 1, building a vehicle body finite element model,and achieving the multidisciplinary performance simulation analysis of a vehicle body; step 2, establishing a parameterized model based on the upper vehicle body joint cavity and the upper vehicle body key sheet metal part thickness as design variables; 3, according to the step 2, building a simulation optimization process based on the upper vehicle body connector cavity and the key sheet metal part material thickness as design variables; 4, performing DOE sampling calculation of each design variable according to the step 3; 5, constructing a response surface approximation model meeting the precision requirement according to the DOE sampling calculation result in the step 4; and 6, according to the response surface approximation model in the step 5, taking the limit value of the multidisciplinary performance index of the vehicle body as a constraint condition, and taking the lightest weight of the vehicle body as an optimization target to carry out optimization design and obtain an optimization scheme. According to the method, the lightweight optimization scheme meeting the multidisciplinary performance requirements of the vehicle body can be quickly found.

Description

technical field [0001] The invention relates to the technical field of automobile CAE simulation, in particular to an MDO technology-based upper body structure optimization method. Background technique [0002] At present, the development of CAE simulation technology in major automobile manufacturers is quite mature, and the accuracy of single-subject simulation is also increasing day by day, and the level that simulation can replace experiment has been gradually realized. Although the traditional single-subject simulation analysis can achieve the "optimum" performance of each subject through advanced optimization methods and means, it does not fully consider the coupling and constraint relationship between various performances, and the optimization scheme lacks globality. Therefore, in order to overcome the disadvantages of single-subject optimization design, the method of car body structure optimization based on MDO technology has been continuously developed and improved. ...

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Problems solved by technology

Therefore, following the traditional single-discipline simulation analysis optimization method and meeting the performance requirements of various disciplines at the same time will lead to excessive body performance and heavy body, which will be a huge challenge to the development cycle and development cost of the body.

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