摘要
为提升某国产商用车车架可靠性、经济性设计水平,对其进行抗疲劳轻量化仿真研究。首先基于多体动力学软件ADAMS/Car建立整车刚柔耦合装配,模拟整车满载时在B级路面以50km/h速度行驶的工况,提取车架与悬架连接处的载荷-时间历程,结合惯性释放法得到的单位载荷下的应力响应,基于车架材料的S-N曲线对疲劳寿命进行预测;分析结果表明:车架疲劳寿命为62.99×10^4km,符合国家《机动车强制报废标准规定》关于中型商用车安全行驶里程为60×10^4 km的要求。其次结合Morris全局灵敏度分析进行商用车车架疲劳寿命显著因子的筛选。最后基于最优拉丁超立方法进行实验设计,Kriging近似模型进行拟合,ASA自适应模拟退火算法进行优化,使商用车车架在满足《机动车强制报废标准规定》疲劳寿命的基础上减轻其质量,达到轻量化的目标。
In order to improve the reliability and economic design level of a domestic commercial vehicle frame, the anti-fatigue and lightweight simulation is carried out. Firstly, because of the multi-body dynamics software ADAMS/Car, the rigid-flexible coupling assembly of the whole vehicle is established to simulate under the working condition of the B-level pavement at 50 km/h when the whole vehicle is fully loaded, and the load-time history of the joint between the frame and the suspension is extracted, combined with the stress response under the unit load at the joint between the frame and the suspension using the inertia release method,the S-N curve of the frame, the frame fatigue life can be predicted;The analysis result shows that the frame fatigue life is 629,900 kilometers, which meets the requirements of China’s "Standard for compulsory scrapping of motor vehicles" for medium-sized commercial vehicles with a safe driving range of 600,000 kilometers. Secondly, Morris global sensitivity analysis is used to screen the significant factors of fatigue life of commercial vehicle frames. Finally, based on the optimal Latin hypercube designing the variable factor of the frame fatigue life, the Kriging approximation model and the optimization of the ASA adaptive simulated annealing algorithm, domestic commercial vehicle frame meet the fatigue life of the "Standard for compulsory scrapping of motor vehicles" and achieve the goal of light weight.
作者
郭秋红
展新
王敏
林长波
黄伟
GUO Qiuhong;ZHAN Xin;WANG Min;LIN Changbo;HUANG Wei(College of Mechanical Engineering,Guangxi University,Nanning 530004,China;Guangxi Dongfeng Liuzhou Motor Company,Liuzhou Guangcxi 545000,China)
出处
《机械设计与研究》
CSCD
北大核心
2020年第1期210-215,共6页
Machine Design And Research
基金
广西创新驱动发展专项资金(科技重大专项,桂科AA18242033)。
关键词
商用车车架
疲劳寿命分析
刚柔耦合
Morris全局灵敏度
轻量化
Commercial vehicle frame
fatigue life analysis
rigid-flexible coupling
Morris global sensitivity
lightweight
