摘要
道路平整度是影响行驶舒适性的重要因素,不平整路面会增强行驶车辆的车身振动,降低车辆行驶质量。该研究针对城市道路的行驶舒适性预估问题,提出一种基于离散平整度指数(discrete roughness index,DRI)的城市道路舒适性预估模型和方法。依托MATLAB/Simulink构建8自由度整车仿真模型,提取驾驶员座椅的垂直加速度,并计算最大瞬时振动指标(maximum transient vibration value,MTVV)对舒适性水平进行量化。以某代表车型为试验对象,采用实测路面高程数据进行仿真,解析速度、时长、轮迹等因素对行驶舒适性的影响程度,采用幂函数构建基于DRI的瞬时舒适性预估模型。结果表明,相对于传统采用的国际平整度指数(international roughness index,IRI),DRI与瞬时舒适性的关联性更好,其拟合优度超出IRI达0.1以上;车速对舒适性影响显著,车速越大,MTVV对路面局部平整性敏感度越高。最后,选用2 s-MTVV对应的舒适性预估模型,基于ISO 2631-1(国际标准:机械振动与冲击人体处于全身振动的评价)中提出的舒适性等级标准,提出了可表征瞬时舒适性等级的离散平整度指数阈值。结果可为城市道路舒适性评估,车辆驾驶辅助提供可靠决策支持。
Road roughness is a key factor affecting driving comfort,an uneven road enhances vehicle vibration,reducing driving quality.In this paper,a prediction method of driving comfort on urban road was proposed by using the discrete roughness index(DRI).Based on MATLAB/Simulink,an 8-degree-of-freedom vehicle simulation model was developed to solve the vertical acceleration on the driver’s seat.The maximum transient vibration value(MTVV)was calculated to quantify the driving comfort level.Taking a representative vehicle as the test subject,simulations were conducted on many urban roads with different roughness values.During the simulations,the effects of speed,time duration,and wheel path were investigated.The power function regression model was adopted to develop the correlations between MTVV and DRI.The simulation results reveal that DRI performs better on driving comfort prediction than international roughness index(IRI).The R-square of DRI-MTVV exceeds that of IRI-MTVV by more than 0.1.Vehicle speed has significant impact on driving comfort prediction,and MTVV is more sensitive to pavement roughness at higher speed.Finally,the correlation between 2 s-MTVV and DRI is adopted for driving comfort prediction.The thresholds of DRI representing the comfort levels were proposed based on the standard comfort level in ISO 2631-1.The results can support the driving comfort prediction on urban road and vehicle driving assistance reliably.
作者
关丽敏
汪贵平
朱进玉
吴荻非
GUAN Limin;WANG Guiping;ZHU Jinyu;WU Difei(School of Electronics and Control Engineering,Chang’an University,Xi’an 710064,China;Key Laboratory of Road and Traffic Engineering of Ministry of Education,Tongji University,Shanghai 201804,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2021年第24期236-242,共7页
Journal of Vibration and Shock
基金
国家重点研发计划项目(2019YFB1600100)
陕西省重点研发计划项目(2019ZDLGY15-04-02,2019GY-059,2019GY-083)。
