Lightweight hierarchical optimization design method for automobile structure

Abstract

The invention relates to a lightweight hierarchical optimization design method for an automobile structure, which comprises the following steps of: firstly, building a finished automobile finite element model, and then carrying out first-level optimization and second-level optimization based on the finished automobile finite element model; whereinaccording to the first-level optimization, firstly,a soft constraint model is constructed, then topological optimization analysis is carried out, material distribution of a research object is optimized, then the structural shape of the research object is optimized, an area with concentrated strain energy in the soft constraint model is found out, and the area with concentrated strain energy is optimized; and in the second-level optimization, thefinished automobile finite element model is taken as an analysis object, simulation analysis is executed, then a transfer function of the control factor and the output performance is established, optimization of the control factor is completed based on the transfer function, and an optimal solution is obtained. According to the lightweight hierarchical optimization design method for the automobilestructure, the problem of design redundancy or performance insufficiency can be relieved through moderate lightweight; the performance of the finished automobile can be fully associated and improved,and the structure optimization effect is more obvious.

Description

technical field [0001] The invention relates to the technical field of lightweight automobiles, in particular to a hierarchical optimization design method for lightweight automobile structures. Background technique [0002] Automobile lightweight means to make the lightest weight under the premise of ensuring relevant performance, so as to reduce the weight of the whole vehicle and fuel consumption. There are three main ways to achieve lightweight: 1. Lightweight structure, that is, to adopt a more reasonable structural design, which is also a more economical and practical way; 2. Lightweight materials, that is, to use light metal or non-metal with high strength and low density Materials; 3. Process lightweight, that is, through more advanced process technology. [0003] Existing lightweight technologies for automobile structures all take the modal, stiffness and other properties of the research object (closing parts, body-in-white) under the "hard constraint state" (the bo...

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Problems solved by technology

[0004] Aiming at the problem that the existing lightweight technology of automobile structure cannot effectively correlate and reflect the performance of the whole vehicle, resulting in design redundancy or insufficient performance, the present invention proposes a hierarchical optimization design method for lightweight automobile structure, which can realize forward development of lightweight automobile structure , and can take into account the vehicle performance and quality

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