摘要
对由矩形管梁拼焊而成的客车骨架结构进行轻量化研究.首先计算了矩形管梁单元的截面特性,并定义了客车骨架的静态弯扭刚度响应与动态频率刚度响应.其次建立了客车结构优化数学模型:目标函数是车身骨架质量;设计变量是矩形管截面宽度、高度与厚度;约束是弯扭刚度与频率刚度.然后推导了响应对设计变量的灵敏度信息,并采用序列线性规划求解了该非线性优化模型.最后通过数值算例验证了该模型能在满足约束条件的前提下高效地获得轻量化的客车最优结构.
In order to achieve a lightweight structure of the bus frame consisting of reccross-sectional properties of the rectangular tubes are calculated, and the responses of static torsional stiffness, and dynamic frequency stiffness are respectively defined. Next, a structural optimization modelof the bus frame is constructed. In the model, the objective function is the structural mass, the design variables arethe cross-sectional breadth, height, and thickness of the rectangular tubes, and the cotorsional and frequency stiffness. Then, the sensitivity information of the responses with respect to the design varia-bles is derived, and the nonlinear optimization model is solved through the sequential linear programming. Finally, by a numerical example, it is proved that the proposed method can efficiently acquire the optimal bus frame that satisfies the constraint conditions.
出处
《华南理工大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2017年第8期7-12,共6页
Journal of South China University of Technology(Natural Science Edition)
基金
国家自然科学基金面上项目(51575226)
吉林省科技发展计划项目(20140101071JC)~~
关键词
客车骨架
轻量化设计
弯扭刚度
频率刚度
优化设计
bus frame
lightweight design
bending and torsional stiffness
frequency stiffne