Vehicle body structure steady design method based two uncertain saloon cars

Abstract

The invention discloses an approximation model uncertainty state salon car body structure steady design method in the technical field of automobile manufacturing, based on parameter uncertainty of vehicle body design variable, and taking vehicle body performance to respond a Kriging model. The salon car body structure steady design method aims at overcoming the defects that at present, a vehicle steady design method just considers parameter uncertainty to obtain steady solving which easily generates big forecast error, and even generates failure constraints, vehicle body parameter uncertainty can be reduced, and approximation model uncertainty affects vehicle body structural performance. The salon car body structure steady design method improves accuracy of design scheme target performance of a vehicle body structure and effectiveness of restraint performance.

Description

technical field [0001] The invention relates to a method in the technical field of automobile manufacturing, in particular to a robust design method for a car body structure based on uncertain parameters of body design variables and an approximate model uncertainty state in which each body performance responds to a Kriging model. Background technique [0002] In the process of car body structure design, body parameters (such as plate thickness, section size, material parameters, etc.) Affects the robustness of the body performance. The robust design method improves the performance of the body product and ensures the stability of the performance under the consideration of the influence of the uncertainty of the body parameters. At present, in the robust design of the body, in order to reduce the calculation time of the optimal design samples of the body and realize the accurate convergence of the optimization process, the approximate model is widely used instead of the simul...

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Problems solved by technology

[0008] Aiming at the above-mentioned deficiencies in the prior art, the present invention proposes a robust optimization design method based on two kinds of uncertain car body structures, aiming at the robust solution obtained by the current robust design method only considering uncertain parameters, which tends to produce large prediction errors , and even the defect of constraint failure, can reduce the influence of body parameter uncertainty and approximate model uncertainty on the body structure performance, and improve the accuracy of the target performance of the body structure design scheme and the effectiveness of constraint performance

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