某越野车车架固有频率优化及轻量化  

Optimization of the Natural Frequency and Lightweight of a Sport Utility Vehicle Frame

作　　者：丁玲[1] 朱雄[1] 

机构地区：[1]合肥工业大学机械与汽车工程学院,合肥230009

出　　处：《上海汽车》2013年第2期22-25,共4页Shanghai Auto

摘　　要：以某越野车车架为研究对象,进行初步的刚度和模态分析,验证了该车车架弯曲刚度和扭转刚度符合设计要求,并发现该车架一阶模态频率和发动机怠速运转频率非常接近容易引起共振这一问题。针对这一问题,进行了以车架零部件厚度为设计变量,保证车架弯曲刚度和扭转刚度不降低的前提下,以一阶模态频率大于27 Hz为约束条件,以车架质量最小为目标函数的尺寸优化。优化结果表明:车架的总质量下降2.14%,同时弯曲刚度提高显著,扭转刚度略有提高,一阶模态频率从24.616 Hz提高到26.970 Hz,避开了发动机的怠速运转频率,优化效果较为显著。Taking a sport utility vehicle frame as the research object, after the preliminary anal- ysis of stiffness and lower modal frequency of the frame, we find that the frame bending stiffness and tor- sion stiffness meet the design requirements, but we also discover the problem that it easily lead to reso- nance for the frame first order modal frequency is very close to the engine idle speed frequency. In order to solve this problem, taking the frame parts thickness as the design variables, an size optimization is conducted with a constraint of meeting the requirements of bending stiffness, torsion stiffness, the first order modal frequency not less than 27Hz and an objective of minimizing the mass of the frame. The re- suits show that the total mass of the frame reduced by 2.14%, at the same time the bending stiffness in- creased significantly, the torsion stiffness increased slightly and the first order modal frequency increased from 24.616 Hz to 26.970 Hz, it effectively avoid the engine idle speed frequency.

关 键 词：车架 越野车 轻量化 

分 类 号：U463.32[机械工程—车辆工程]