Engineering lightweight method and system for vehicle body made of mixed materials

The invention relates to the technical field of rail transit, and provides an engineering lightweight method and system for a mixed material vehicle body. The material direction arrangement in a force transmission path is analyzed through free size optimization, and the problems that material selection in a vehicle body structure, especially selection arrangement of anisotropic composite materials and isotropic metal materials, component selection arrangement and arrangement are lack of systematic scientific methods, and lightweight concept optimization is difficult to engineer are solved. Materials with proper performance and cost are applied to the position with the proper structure, the light weight level of the vehicle body structure is greatly improved, and engineering realization of vehicle modularization and function integration is facilitated. 本发明涉及轨道交通技术领域，提供了一种混合材料车体工程化轻量化方法及系统；通过自由尺寸优化分析传力路径中材料方向布置，解决了车体结构中材料选型特别是各向异性复合材料和各向同性金属材料的选型布置、构件选型布置及布置缺乏系统科学方法及轻量化概念优化难以工程化的问题，将合适性能和成本的材料运用到结构合适的位置，极大的提高车体