摘要
为了研究公路路面不平整引起的汽车振动情况,以车辆振动系统为研究对象,开展路面不平整度影响下的车辆振动数值模拟研究。运用广义虚功原理建立四自由度汽车振动微分方程组。设定车辆模型在道路表面以某一设定速度匀速运动,引用国家标准GB/T7031—2005给出的路面不平整功率谱密度公式,运用傅氏逆变换获得时域模拟的不同等级公路路面不平整度。在此基础上,将路面不平整度序列输入到建立的汽车振动微分方程组中,建立了考虑路面不平整度因素的车辆振动数值模型,用以研究车辆的振动响应情况与车辆行驶速度和公路路面状况之间的关系。结果表明:(1)相同车速情况下,随着路面状况变差,车体振动强度呈现几何级数增大的趋势;(2)相同路面等级情况下,车体振动强度随车速增大而增加,但存在一个车速增大而车体振动强度不再增大的平缓区间。(3)考虑随机性路面不平整度影响,建立数值模型模拟的研究方法还可用于提高车辆行驶舒适性和稳定性、降低对运输货物损伤为目标的车辆设计参数优化设计等。
In order to study the vehicle vibration caused by road pavement roughness,taking vehicle vibration system as the research object,the vehicle vibration numerical model influenced by road pavement roughness is researched.The differential equations for 4-DOF vehicle vibration are established by generalized virtual work principle.Setting the vehicle model to move on road pavement at a given uniform speed,the values of timedomain simulated road pavement roughness of different road grades are obtained by using the formula of road pavement roughness power spectral density in GB/T7031—2005 and Fourier inverse transformation.On this basis,the road pavement roughness sequence is input into the vehicle vibration differential equations,and the vehicle vibration numerical model considering the road pavement roughness is established to study the relationship of vehicle vibration response with vehicle speed and road surface conditions.The result shows that(1)The vehicle vibration intensity increases by geometric progression with the increase of road pavement roughness at the same vehicle velocity;(2)under the same pavement grade,the vehicle vibration intensity increases with the increase of vehicle velocity,but there is a gentle interval in which the vehicle velocity increases while the vehicle vibration intensity no longer increases;(3)considering the influence of random pavement roughness,the research method of establishing numerical simulation model can also used in the vehicle parameter optimization such as improving the driving stability and comfort of vehicle,decreasing the damage of freights.
作者
张建莉
陈榕峰
姚岢
ZHANG Jian-li;CHEN Rong-feng;YAO Ke(South China Agricultural University,Guangzhou Guangdong,510642,China;Guangdong Provincial Transport Planning&Research Center,Guangzhou Guangdong 510101,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2019年第11期129-133,共5页
Journal of Highway and Transportation Research and Development
基金
国家星火计划(2015GA870063)
关键词
汽车工程
汽车振动
数值分析
振动强度
广义虚功原理
automobile engineering
vehicle vibration
numerical analysis
vibration intensity
generalized virtual work principle
