Two-step optimization design method for automotive body section shape

Abstract

The invention discloses a two-step optimization design method for an automotive body section shape. A box-type section is adopted as an intermediate variable to establish two-step collaborative optimization design. The first step of optimization design includes: taking weight of an automotive body as an objective function and high stiffness performance as a constraint condition to build an optimization model in regard to dimension parameters of length, width and thickness of the box-type section; adopting serial linear programming based on component sensitivity information to solve the optimization model so as to obtain the optimal dimension of the box-type section, and further obtaining optimal geometric features of the section. The second step of optimization design includes: taking a minimum sectional area as an objective as well as bending inertia moment, torsional moment of inertia and manufacturing process obtained through first-step optimization as constraint conditions, performing section shape optimization study on sheet thickness and node coordinates of a beam section; adopting a genetic algorithm to solve a polynomial of discrete-continuous variables. By the optimization design method, the complex section shape of the automotive body is determined rationally, and the problem troubling the field of automotive body structure design is solved.

Description

technical field [0001] The invention belongs to the field of automobile body design, and relates to an optimal design method for a body section, which is mainly used for determining the geometric shape of a car body section so as to realize the goal of "light weight and high rigidity" of the overall performance of the body structure. Background technique [0002] When solving the most important proposition of the automobile industry, energy saving and environmental protection, new energy vehicle technology is one path, and the other path is automobile structure lightweight technology—that is, how to make the car "slim down" under the premise of ensuring the safety of the car . Reducing the body weight can increase output power, reduce noise, improve handling, reliability, increase vehicle speed, reduce fuel consumption, and reduce exhaust emissions. [0003] The lightweight design of car body structure can be divided into three steps. The first step is to use topology opti...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the above-mentioned problem of optimizing the section geometry of the automobile body, and provide a two-step optimization design method for the section shape of the automobile body

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