摘要
针对某SUV车抗点头和抗抬头性能较差,运用虚拟样机技术,建立其前后悬架虚拟样机模型。通过虚拟仿真,揭示了各自的运动学和动力学规律。在较少改动零部件的前提下,对模型中前悬架导向机构的硬点进行了调整。结果表明:将下控制臂与车架前安装点向下调整20 mm,抗点头和抗抬头性能分别提高约80%和30%。为了考察此改动对操纵稳定性的影响,建立了整车虚拟样机模型,并按照国标对稳态回转特性进行了虚拟和实车试验,结果两者吻合较好,从而验证了虚拟样机模型的正确性。此外,对前悬架改进前后的整车虚拟样机模型分别进行了转向回正及阶跃输入虚拟试验。结果表明,该改动对整车性能影响很小,前悬架导向机构硬点的调整方案,是可以接受的。
In the light of the prototype models of its front poor anti-dive and anti-lift performances of a certain SUV, virtual and rear suspension systems were built using the virtual prototype technique. Their kinematic and dynamic behaviors were revealed through simulations. The hardpoint of the guide mechanism of the front suspension system in the simulation model was modified under the condition of minimal possible modification of the components. The simulation results show that when the connection point of the lower control arm with the front body is pulled down by 20 mm, the vehicle anti-dive and anti-lift performances are improved by 80% and 30% respectively. In order to check the effect of the modification on the vehicle handling and stability,a complete virtual prototype model was built for the vehicle, the virtual prototype and real vehicle tests about the vehicle steady-state circular response were performed according to the China national standard, and both results were in a good agreement, validating the proposed virtual prototype model. Furthermore, the virtual tests of the steer release and step steer were performed on the complete vehicle virtual prototype model before and after the hardpoint modification of the front suspension system, showing that the modification has little effect on these performances. Therefore, the proposed modification on the front suspension hardpoint is acceptable.
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2007年第3期499-503,共5页
Journal of Jilin University:Engineering and Technology Edition
基金
吉林省科技发展计划重点项目(20040332-2)
关键词
车辆工程
虚拟样机
悬架
抗点头性能
抗抬头性能
vehicle engineering
virtual prototype
suspension
anti-dive performance
anti-lift performance
