In this study, the integrated MSOT (M-Multi-dimensional factor autobody model, S-Screening autobody component, O-Optimization of plate thickness, T-Testing, and validation) integration method is adopted to optimize the automobile body structure design for weight reduction. First, a multi-dimensional factor body model is established, then components of the vehicle are screened for the most important targets related to weight reduction and performance, and a multi-objective optimization is performed. Virtual experiments were carried out to validate the analysis and the MSOT method were proposed for lightweight design of the automobile body structure. A multi-dimensional performance model that considers stiffness, modality, strength, frontal offset collision, and side collision of a domestic passenger car body structure. Components affecting the weight of the vehicle were identified. Sheet metal thickness was selected as the main optimization target and a multi-objective optimization was carried out. Finally, simulations were performed on the body structure. The comprehensive performance, in terms of fatigue strength, frontal offset collision safety, and side collision safety, was verified using the optimized Pareto solution set. The results show that the established MSOT method can be used to comprehensively explore the weight reduction of the body structure, shorten the development process, and reduce development costs.

在这项研究中，采用集成的MSOT（M多维因子车身模型，S-Screening车身部件，O-优化板厚，T-Testing和验证）集成方法来优化车身结构的重量减少。首先，建立多维因子车身模型，然后针对与减重和性能相关的最重要目标筛选车辆部件，然后执行多目标优化。进行了虚拟实验以验证分析结果，并提出了MSOT方法用于车身结构的轻量化设计。多维性能模型，考虑了家用乘用车车身结构的刚度，模态，强度，正面偏移碰撞和侧面碰撞。确定了影响车辆重量的组件。选择钣金厚度作为主要的优化目标，并进行了多目标优化。最后，对人体结构进行了模拟。使用优化的Pareto解决方案集验证了疲劳强度，正面偏置碰撞安全性和侧面碰撞安全性方面的综合性能。结果表明，所建立的MSOT方法可用于全面探索车身结构的减轻重量，缩短开发过程，降低开发成本。在疲劳强度，正面偏置碰撞安全性和侧面碰撞安全性方面，使用了优化的Pareto解决方案集进行了验证。结果表明，所建立的MSOT方法可用于全面探索车身结构的减轻重量，缩短开发过程，降低开发成本。在疲劳强度，正面偏置碰撞安全性和侧面碰撞安全性方面，使用了优化的Pareto解决方案集进行了验证。结果表明，所建立的MSOT方法可用于全面探索车身结构的减轻重量，缩短开发过程，降低开发成本。