【作者】 张守海；

【导师】 马天飞；

【作者基本信息】 吉林大学 ， 车辆工程， 2010， 硕士

【摘要】 提高汽车运行过程中的平顺性、安全性、稳定性,减小汽车振动,已经成为了一个亟待解决的问题之一。各汽车制造商同时也认识到汽车的乘坐舒适性和操纵稳定性是产品竞争力的关键因素之一。本文针对WL2310P四轮汽车在40-60km/h时出现整车振动较大问题进行选题,运用有限元建模、分析,结合Matlab软件进行分析。以整车平顺性研究为基础,以优化设计理论为工具,尝试探索关于货车悬架系统参数匹配与结构设计合理实用的方法,并利用本公司自己生产的载货汽车对其可行性进行验证。本文在分析过程中主要做了如下工作:将汽车简化为六自由度振动模型,通过有限元分析振型,与实际驾驶情况进行对比。结果表明,模型的计算模态频率与试验结果非常接近,说明这个模型能够模拟原车的动力学特性,适用于车辆的平顺性分析。通过Matlab计算,输出各主要性能参数的变化曲线,然后对其分析,发现原悬架中存在的问题。可以发现降低前悬架刚度;增加前减振器阻尼、增加后减振器阻尼均可以有效改变车辆的平顺性。改变驾驶室橡胶垫的刚度,并不能有效改变车辆的平顺性。从车辆的实际使用条件出发,将该车的前悬架刚度降低、在后悬架处增加减振器,经过重新验证,得出的综合评价是该车的舒适性有了明显改善。这说明汽车舒适性仿真研究对汽车优化设计和汽车舒适性评估是有意义的,计算程序对汽车的设计和评估有一定的应用参考价值本文是生产、学习、研究的结合。采用生产经验与理论分析相结合,可指导实际生产和试验,为产品改进提供依据。课题研究成果将解决公司的整车振动的实际问题,并形成一套简易可行的整车平顺性研究方法和悬架系统匹配分析方法,使公司获得很大的经济和社会效益。更多还原

【Abstract】 Improve vehicle ride comfort during the operation, security, stability, reduce vehicle vibration, has become one of a serious problem. The car manufacturers also realize that the ride comfort and handling stability of vehicle is the product key factor in competitiveness. Contrapose a WL2310P truck appear obvious vibration at 40-60m/h, This text use FEM to build models to analysis,combine Matlab to calculate.based on the ride comfort of the whole truck,use the theory of optimize design,attempt to explore rational method about how to matching the suspension system of a truck.and use the truck made of my own company to validate the feasibility.This thesis majorly completed the following duties:The truck will be reduced to six degrees of freedom vehicle vibration model shapes by finite element analysis, compared with the actual driving conditions. The results show that the model calculations and experimental modal frequencies are very close, indicating that this model can simulate the dynamics of the original car for the ride of the vehicle. Calculated by MATLAB, The main performance parameters of the output curve, and its analysis, found that problems in the original suspension.we can find in the front suspension lower stiffness; increase before the shock absorber damping, increased damping can be effective in changing the vehicle ride comfort. Change the stiffness of the cab pads and can not effectively change the vehicle’s ride comfort. From the vehicle’s actual use conditions, the paper will reduce the stiffness of the car’s front suspension, add the shock absorber in the rear suspension, after re-verification, the comprehensive evaluation is obtained comfort of the car has improved significantly. This shows that simulation of vehicle comfort and vehicle optimization design of automotive comfort assessment is meaningful, computer program design and evaluation of the car has some application reference value.In all,this thesis is combination of production,study with research,analyzing experience.use the combination of production experience and analysis of theory,can prove theoretical direction for production advance.this thesis can resolve the true problem of the vibration of the truck. And the formation of a simple and feasible method for ride comfort and suspension system of matching methods, the company was great economic and social benefits.更多还原