A method for optimizing the cross-sectional shape of forward conceptual design of automobile body

Abstract

A method for optimizing the cross-sectional shape of forward conceptual design of automobile body is disclosed. A top-down multi-cross-sectional shape optimization step is adopted to optimize the cross-sectional shape of automobile body, and high calculation precision and lightweight design effect of automobile body structure are obtained. According to the optimization method of automobile body section shape in forward conceptual design, aimed at the characteristics of thin-walled beam, an improved dynamic stiffness matrix considering poisson effect is adopted. The proportional vector method and the thickness parameter of thin-walled beam are used as optimization variables to reduce the optimization variables and ensure the feasibility of multi-section optimization. Considering bending stiffness, torsional stiffness and first-order free vibration frequency as design constraints, three kinds of manufacturing and assembly constraints are included to ensure the manufacturability of the optimized structure. Using distributed parallel optimization technology, the overall optimization speed of the vehicle body is significantly improved. The method of the invention is accurate in solution, fast in calculation and practical and reliable.

Description

Technical field [0001] The invention relates to the field of automobile body design, in particular to a method for designing optimization of structural cross-section shapes in a conceptual design phase of a body. Background technique [0002] Conceptual design is an important part of the car body design process, and reverse conceptual design is a design method widely adopted by automotive companies. However, reverse conceptual design is often overly restricted by the limitations of benchmark car models, with long design cycles, low efficiency, and low quality, making it difficult to achieve performance-oriented body design. In the forward conceptual design, the important performance indicators of the car body, such as static bending stiffness, torsional stiffness and first-order free vibration characteristic frequency, are considered at the beginning of the design, which is conducive to the realization of the performance-oriented car body conceptual design, improving design effic...

AI Technical Summary

Problems solved by technology

This method uses the coordinates of the control points of the section as the optimal design variable, and is suitable for the analysis of the section at a specified position of the vehicle body. When there are more than a dozen or even dozens of vehicle body sections that need to be optimized, it is difficult to work

In addition, the manufacturing and assembly constraints of load-carrying thin-walled beams are not fully considered, which makes it difficult for the current body section shape optimization method to

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