Car body structure optimum system based on solidity design

Abstract

The invention relates to car body design field in particular to car body structure optimization system which is based on the stable design. The invention is characterized in that CUI module is the graph user interface that the users use; the middle result and last result of the module in the interactive operation process is received; the variable definition module is responsible for the determination of designing variable and noise factors and transfer the results to CUI module; response face modeling module is responsible for buliding designing variable, noise factors and mathematical model of car body structure property index and then transfering to CUI module and stable optimization module; the stable optimization module builds stable desiging rule function and property probabiligy limiting relationship and completes the buliding of stable structure optimization mathematical model, then get the best stable designing result of the stable structure optimization mathematical model by optimization and transfer the best result to CUI module. The invention has the advantages that the invention relates to the influence that the designing variable and noise factors differences works on the structure property index; the propabiligy caculation of the property limiting function is accurate.

Description

technical field [0001] The invention relates to a system in the field of automobile body structure design, in particular to a car body structure optimization system based on robust design. Background technique [0002] At present, in the product design process of car body structure, optimization design technologies such as topology optimization, shape optimization and size optimization have been gradually applied, which shortens the product development cycle and provides the optimal design scheme for subsequent manufacturing. However, in the actual manufacturing process, random factors such as plate thickness, section size, material parameters (elastic modulus, yield limit, strength limit) and other random factors of the body structure parts have certain variations from the nominal design values, and the above factors are not considered The impact of variation will greatly reduce the reliability of the engineering application of the design scheme, or even lose its feasibilit...

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Problems solved by technology

[0003] It is found by retrieving documents of the prior art that, in terms of car body structure design, B.D.Youn published "Reliability-based design optimization for crashworthiness of vehicleside impact" ( The reliability design optimization based on the side crashworthiness of automobiles) only takes the geometric size of the parts as the design variable, and considers the variation of the design variables and the impact on the crash safety performance, but fails to consider the impact of the variation of material parameters on the crash performance. Influence; Bharatendra Rai published "Robust design of an interior hard trim to improve occupant safety in a vehicle crash" (interior of improving occupant safety in automobile crash) in "Reliability Engineering and System Safety" (Reliability Engineering and System Safety) 2005 Volume 89 Robust Design for Trim Parts), which considers the impact of the variation of the geometric dimensions of the parts and the elastic modulus of the material on the occupant safety performance, but the traditional Taguchi (Taguchi) robust design method adopted cannot establish the design variables and noise factors and performance. The mathematical model of the response index fails to establish an optimal mathematical model for robust design, so it cannot provide an overall optimal robust design solution

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