An optimization method of upper body structure based on mdo technology

Abstract

The invention relates to an upper body structure optimization method based on MDO technology, comprising the following steps: step 1, establishing a finite element model of the body to realize multidisciplinary performance simulation analysis of the body; step 2, establishing a joint cavity based on the upper body and the upper body The parametric model with the material thickness of the key sheet metal parts of the car body as the design variable; Step 3, according to Step 2, build a simulation optimization process based on the upper body joint cavity and the material thickness of the key sheet metal parts as the design variables; Step 4, according to Step 3, carry out the DOE sampling calculation of each design variable; Step 5, construct a response surface approximation model that meets the accuracy requirements according to the DOE sampling calculation results in Step 4; The limit of the subject performance index is used as the constraint condition, and the lightest vehicle body weight is taken as the optimization objective to carry out the optimal design and obtain the optimal solution. The invention can quickly find out the lightweight optimization scheme that meets the multidisciplinary performance requirements of the vehicle body.

Description

technical field [0001] The invention relates to the technical field of automobile CAE simulation, in particular to an upper vehicle body structure optimization method based on MDO technology. Background technique [0002] At present, the development of CAE simulation technology in major automobile manufacturers is quite mature, and the accuracy of single-disciplinary simulation is also increasing. Although the traditional single-discipline simulation analysis can achieve the "optimal" performance of each discipline through advanced optimization methods and means, it does not fully consider the coupling and restrictive relationship between the various properties, and the optimization scheme lacks globality. Therefore, in order to overcome the drawbacks of single-disciplinary optimization design, the optimization method of car body structure based on MDO technology has been continuously developed and improved. [0003] The upper body is an important part of the body, and its ...

AI Technical Summary

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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