Multi-objective optimization design method based on vehicle body section parameterization

Abstract

The invention discloses a multi-objective optimization design method based on vehicle body section parameterization. The multi-objective optimization design method comprises vehicle body section parameterization modeling and vehicle body section multi-objective optimization. The method comprises: according to cross-section input of a vehicle body, establishing a lap joint of a main section of a vehicle body parameterized model, establishing an external characteristic model of the parameterized vehicle body according to modeling CAS data, establishing a detailed parameterized vehicle body modelby means of a previous generation of vehicle body finite element model or competitive vehicle body data, and recording variables of the main section of the vehicle body to complete vehicle body parameterized modeling; parameterization model, finite element mesh division of the DOE test matrix is completed. solving the test matrix finite element model one by one to obtain the mass, modal, torsional rigidity and bending rigidity of the vehicle body, establishing a response surface approximation model, and carrying out optimal solution on the size of the main section of the vehicle body on the premise of ensuring that the weight is not increased according to the approximation model to obtain the optimal rigidity performance of the vehicle body.

Description

technical field [0001] The invention relates to an optimal design method, in particular to an optimal design method for the cross-sectional size of a passenger car body. Background technique [0002] The traditional body development process is generally as follows: the shape designer determines the CAS shape of the body, the body design engineer designs the section and body structure, the CAE performance analysis engineer conducts performance analysis and evaluation of the structure, and for unreasonable structures, the body design engineer improves the structure, and then Carry out CAE analysis and verification, so many rounds of analysis and improvement, and finally carry out the actual vehicle trial production of the approved plan, and carry out road and bench test verification. The entire process works serially and requires a long cycle. [0003] In recent years, with the shortening of the development cycle of passenger cars, severe challenges have been posed to the dev...

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Problems solved by technology

[0004] However, in order to optimize the design of the main section of the car body in the early stage of car body development, for the traditional CAE method, it is only possible to evaluate the performance of the section itself. The impact of changes on the overall performance of the car body cannot be accurately judged

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