关键词: 商用车；后防护装置；轻量化；Nastran

Abstract: Based on engineering materials science and finite element theory, Nastran simulation software is used in this paper. According to the requirements of the national standard, the structural optimization design and comparative analysis are carried out for the lightweight schemes of steel rear protection and aluminum rear protection of a commercial light truck. The CAE stiffness analysis of the lightweight scheme of aluminum alloy rear protection structure meets the target requirements. Compared with steel rear protection, the weight of aluminum alloy rear protection is reduced by 6.1 kg, and the lightweight effect is remarkable. On the one hand, the application scope of aluminum alloy lightweight materials in commercial light truck models is promoted and applied. On the other hand, the weight reduction of 6.1 kg is achieved, which has a significant lightweight effect, helps to reduce the curb weight of light truck, promotes the achievement of the requirements of vehicle Blue Brand Regulations, and provides a strong support for the energy conservation and consumption reduction of commercial light truck.

Key words: Light truck; Rear protection; Lightweight; Nastran