基于虚拟耐久路面的动态载荷分解方法研究

Method of the dynamic load cascading based on virtual durable road

提出了基于虚拟耐久路面动态载荷分解技术的关键路线,路面模型是通过激光扫描后获取与实际路面相同的高精度虚拟路面,结合精确的整车动力学模型与FTire柔性环轮胎模型,可获取与实车状态非常接近的零部件动态载荷,用于汽车零部件耐久性能的分析与优化设计。通过对比实车测试与虚拟仿真的轮心六分力数据,识别影响虚拟仿真精度的敏感因素,并通过虚拟验证最终获得较为精确的轮心六分力动态载荷结果。最后,以汽车底盘副车架为例,分别以试验与仿真的动态载荷进行耐久寿命分析,结果表明,基于虚拟耐久路面的动态载荷分解方法具有良好的应用前景,可根据不同的企业路试标准以及不同的质量保证的要求,对零部件疲劳寿命的虚拟仿真结果设定安全系数。虚拟耐久路面的应用可使零部件疲劳寿命预测提前,提高设计成熟度,降低开发成本,减少实车验证风险。

The key route is proposed based on dynamic load cascading technology in virtual durability road spectrum. The road spectrum model is a high-precision virtual road spectrum obtained by laser scanning the actual road spectrum combined with the precise vehicle dynamics model and FTire model. This method can obtain dynamic load of parts very close to the real car. And dynamic load is used to analyze and optimize the durability of auto parts. The sensitivity factors that affect the simulation precision are identified by comparing the vehicle test with the virtual simulation of the forces and moments on wheel center. M ore accurate dynamic load is obtained through virtual validation. Finally,by taking the chassis sub-frame as an example,the fatigue durability analysis is carried out through the dynamic load of test and simulation. The results showthat the dynamic load cascading method based on virtual durable road model has better application foreground.The fatigue life of parts are evaluated by using appropriate safety factors according to different enterprise test standard and requirements of quality assurance. The application of virtual durability road spectrum can make the fatigue-life prediction of parts in advance,improve design maturity,reduce development costs and test risk.