基于铺层设计特征的碳纤维增强复合材料悬架控制臂结构优化
发布时间：2018-07-25 18:37
【摘要】：基于铺层设计特征,提出一种使用碳纤维复合材料对承载结构件进行结构优化设计的方法和流程.该方法综合考虑结构几何特征、材料铺层方式、铺层厚度及铺层角度在设计环节中的序列关系,通过几何设计空间构建、离散变量多目标优化、基于工艺可行性的最优决策等方法实现结构设计.以碳纤维增强复合材料悬架控制臂的轻量化设计为例:首先,以钢质控制臂结构为参考建立复合材料控制臂的几何设计空间;然后,以复合材料铺层便利性为原则对其进行结构设计,采用准各向同性铺层对控制臂的铺层厚度进行设计;进而,以提高控制臂刚度和1阶固有频率为目标,使用优化算法对铺层角度进行多目标优化设计;最后,以工艺可行性为约束对优化结果进行筛选并最终完成结构设计.结果表明,所设计复合材料结构具有更大的刚度和1阶固有频率,并且与钢质结构相比减重47.9%.所提出的方法能够较好地兼顾结构特征和复合材料设计要求之间的关系,为复合材料结构优化设计理论与方法的发展提供有益参考.
[Abstract]:Based on the characteristics of layering design, a method and flow chart for structural optimization design of load-bearing structural parts using carbon fiber composite materials is presented. The method synthetically considers the sequence relation of structure geometry characteristics, material layering mode, layer thickness and layering angle in the design link. Through geometric design space construction, discrete variable multi-objective optimization is carried out. The structure design is realized by the method of optimal decision based on process feasibility. Taking the lightweight design of carbon fiber reinforced composite suspension control arm as an example: firstly, the geometric design space of composite control arm is established by reference to the structure of steel control arm. Based on the convenience of composite lamination, the structure is designed, and the thickness of the control arm is designed by using quasi isotropic layer, and the aim is to improve the stiffness and the first order natural frequency of the control arm. The optimization algorithm is used for multi-objective optimization design of layering angle. Finally, the optimization results are screened with the constraints of process feasibility and the final structural design is completed. The results show that the designed composite structure has greater stiffness and first order natural frequency, and the weight loss of the composite structure is 47.9% than that of the steel structure. The proposed method can take into account the relationship between the structural characteristics and the design requirements of composite materials, and provides a useful reference for the development of the theory and method of structural optimization design of composite materials.
【作者单位】： 湖南大学汽车车身先进设计制造国家重点实验室;
【基金】：国家自然科学基金面上项目(51575171) 中央高校基本科研业务费资助项目
【分类号】：U463.33;U465.6
[Abstract]:Based on the characteristics of layering design, a method and flow chart for structural optimization design of load-bearing structural parts using carbon fiber composite materials is presented. The method synthetically considers the sequence relation of structure geometry characteristics, material layering mode, layer thickness and layering angle in the design link. Through geometric design space construction, discrete variable multi-objective optimization is carried out. The structure design is realized by the method of optimal decision based on process feasibility. Taking the lightweight design of carbon fiber reinforced composite suspension control arm as an example: firstly, the geometric design space of composite control arm is established by reference to the structure of steel control arm. Based on the convenience of composite lamination, the structure is designed, and the thickness of the control arm is designed by using quasi isotropic layer, and the aim is to improve the stiffness and the first order natural frequency of the control arm. The optimization algorithm is used for multi-objective optimization design of layering angle. Finally, the optimization results are screened with the constraints of process feasibility and the final structural design is completed. The results show that the designed composite structure has greater stiffness and first order natural frequency, and the weight loss of the composite structure is 47.9% than that of the steel structure. The proposed method can take into account the relationship between the structural characteristics and the design requirements of composite materials, and provides a useful reference for the development of the theory and method of structural optimization design of composite materials.
【作者单位】： 湖南大学汽车车身先进设计制造国家重点实验室;
【基金】：国家自然科学基金面上项目(51575171) 中央高校基本科研业务费资助项目
【分类号】：U463.33;U465.6
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