关键词: 挤压铝；副车架；轻量化；性能目标；有限元

Abstract: For the purpose of performance and lightweight optimization, this paper establishes the finite element model of the steel subframe, obtains its constraint mode, and carries out strength analysis on the typical working conditions of forward emergency braking, limit steering, and single-side deep pit crossing, and carries out dynamic stiffness analysis on the installation point of swing arm. Then, based on the hard point of the steel front subframe of the vehicle model, through the global optimization strategy of genetic algorithm. The lightweight scheme of extruded aluminum front subframe was designed, and the weight was successfully reduced by 34%, which has certain reference significance.

Key words: Extruded aluminium; Subframe; Lightweight; Performance objectives; Finite element