2014年第4期
文章编号：10094687(2014)040050-04
车辆与动力技术 Vehicle& Power Technology
某四轴越野车底盘平顺性试验研究
李宁，周跃良
（湖北航天技术研究院特种车辆技术中心，武汉430040）
总第136期
摘要：路面是汽车振动的主要激励源，除此之外还有一些其它影响因素。针对一款四轴越野车底盘开展平顺性道路试验，研究该底盘平顺性的主要影响因索。试验结果表明：车速为40km/h和70km/h时，该底盘平顺性较差，应用功率谱密度方法对试验数据进行频域分析，计算激励源的振动频率，计算结果表明：车轮不平衡质量是导致底盘行驶平顺性随车速变化的主要原因，
关键调：四轴越野车；平顺性；试验研究；车轮不平衡质量
中图分类号：U461.4
文献标识码：A
ExperimentResearchonRideComfortofa4-axle
Off-roadVehicle
ZHOU Yue-liang
LINing，2
(Hubei Space Technology Academic Special Vehicle Technology Center, Wuhan 430040, China) Abstract: Road surface roughness was considered as a major source of vehicle vibrations, but there were other factors causing the vibrations. A 4-axle off-road vehicle was tested on the road in order to find out the main influence factors on its ride comfort of the vehicle.The testing results showed that the poor performance on the ride comfort appeared at both about 40 km/h and 70 km/h of the vehicle speeds. The Power Spectral Density method was used to do frequency domain analysis of the test data, and then the frequency of each exciting source was calculated. The calculation results indicated that the unbalanced mass of the wheels was the main exciting sources to cause the deterioration of the ride comfort at different speeds.
Key words: 4-axle off road vehicle; Ride comfort; Experiment research; Wheel unbalance mass
-款四轴越野车前后悬架均采用平衡悬架形
式，车架前后位置分别只有一个位置与车桥连接，其结构特征及振动特征与两轴车近似，经过多年的发展，两轴汽车平顺性研究已经比较成熟，而且形成了比较明确的设计原则(13)：①前悬架偏频应比后悬架偏频低10%~15%；②汽车俯仰振动频率应比垂直振动频率低，垂直振动频率不大于1.2倍
收稿日期：2014-06-24
作者介：李宁（1983-），男，博士，研究方向为车辆工程万方数据
的俯仰振动频率；③汽车惯性系数1。应接近1，使车身俯仰中心在车桥附近，其中I=J/（m,ab）， J，为汽车俯仰转动惯量，m，为汽车簧载质量，a 为质心到前桥的距离，6为质心到后桥的距离；④ 汽车惯性系数1。小于1时，汽车俯仰振动频率将大于垂直振动频率，以俯仰振动为主，商用车及越野车轴距较长，一般情况I。小于1；③车轮不平衡质量、尺寸不均匀性及垂直刚度变化对汽车平顺性