某型越野车悬架系统优化设计研究

发布时间：2018-08-20 19:07

【摘要】：悬架系统作为汽车关键部件之一,其对越野车的平顺性和操稳性有较大影响。因此,开展悬架系统的结构改进与性能优化设计研究具有非常重要的意义。本文以某越野车悬架系统为研究对象,通过对前悬架硬点坐标和悬架性能参数(刚度和阻尼)进行优化设计,以改善越野车的性能。首先,基于Adams软件建立越野车前后悬架系统、转向系统、横向稳定杆、车身、轮胎、制动系统与动力系统等子系统模型,将上述子系统模型装配为整车模型。然后,根据相关国际和国家标准,对整车模型进行随机路面输入和脉冲路面输入的平顺性仿真。仿真结果表明,该越野车在沙石路面上行驶时,平顺性不理想；在三角形脉冲输入路面行驶时,平顺性较好。比较分析仿真结果与整车道路试验结果,对整车仿真模型的正确性进行验证。最后,对前悬架进行仿真分析,根据仿真结果,得到前轮定位参数变化范围均较大,不利于整车操纵稳定性；通过对前悬架硬点坐标进行优化设计,车轮定位参数的变化范围更为合理,同时改善了整车的操纵稳定性。对悬架刚度和阻尼参数进行优化设计,通过合理匹配悬架刚度和阻尼参数,使驾驶员座椅处垂向加权加速度均方根值有所降低,改善了该越野车在沙石路面行驶的平顺性。
[Abstract]:As one of the key parts of vehicle, suspension system has great influence on ride comfort and stability of off-road vehicle. Therefore, it is of great significance to study the structure improvement and performance optimization design of suspension system. In this paper, the suspension system of an off-road vehicle is taken as the research object. The optimization design of the hard point coordinates of the front suspension and the suspension performance parameters (stiffness and damping) is carried out in order to improve the performance of the off-road vehicle. Firstly, based on Adams software, the models of rear and rear suspension system, steering system, lateral stabilizer, body, tire, braking system and power system of off-road vehicle are established, and the above subsystem models are assembled into the whole vehicle model. Then, according to the relevant international and national standards, the simulation of the ride comfort of the vehicle model with random road input and impulse road surface input is carried out. The simulation results show that the ride comfort of the off-road vehicle is not ideal when it is travelling on the sand and stone pavement, and the ride comfort is better when the triangle pulse input is used. The correctness of the vehicle simulation model is verified by comparing the simulation results with the road test results. Finally, the simulation analysis of the front suspension, according to the simulation results, the results show that the front wheel positioning parameters are large, which is not conducive to the vehicle handling stability; through the front suspension hard point coordinate optimization design, The range of wheel positioning parameters is more reasonable, and the handling stability of the whole vehicle is improved. The optimum design of suspension stiffness and damping parameters is carried out. By reasonably matching suspension stiffness and damping parameters, the root mean square value of vertical weighted acceleration at the driver's seat is reduced, and the ride comfort of the off-road vehicle on sand and stone pavement is improved.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U463.33

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