全承载式大客车车身结构多目标优化

建立了全承载式大客车车身骨架的有限元模型,对车身骨架结构进行了振动模态和静力学分析.然后对车身骨架结构进行设计参数灵敏度分析,得出车身骨架扭转刚度和一阶扭转频率对各部件设计参数的灵敏度.在此基础上,以车身骨架杆件厚度为设计变量,通过两阶段结构优化设计,在整车骨架质量增加很少的条件下,提高了整车结构的扭转刚度和一阶扭转频率值;同时,一轮悬空工况下的整车结构应力峰值明显下降,应力分布更加均匀,整车骨架结构设计更为合理.

Multi-objective Optimization on the Body Structure of Integral Bus

A finite element model for the body frame of integral bus is built and the vibration modal analysis and static analysis are performed on body frame structure. Then the sensitivities of torsional stiffness and first-order torsional vibration frequency to design parameters of body frame are obtained by sensitivity analysis. On this basis two stages of optimization design are performed with the section sizes of frame bars as design variables. As a result, the torsional stiffness and 1 st order torsional vibration frequency are raised with only slight increase in frame mass. In addition, the peak stress of the whole body structure in the condition of one front wheel suspended is greatly reduced with evener stress distribution and the design of whole body frame structure tends to be more rational.