Prediction of driving comfort on urban road based on discrete roughness index
GUAN Limin1, WANG Guiping1, ZHU Jinyu1, WU Difei2
1. School of Electronics and Control Engineering, Chang’an University, Xi’an 710064, China;
2. Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai 201804, China
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。本文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,并计算最大瞬态振动指标(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2s-MTVV对应的舒适性预估模型,基于ISO2631-1(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。
Abstract:Road roughness is a key factor affecting driving comfort, an uneven road will enhance the vehicle vibration, reducing the driving quality. In this paper, a prediction method of driving comfort on urban road is proposed by using the discrete roughness index (DRI). Based on Matlab/Simulink, an 8-degree-of-freedom vehicle simulation model is developed to solve the vertical acceleration on the driver’s seat. The maximum transient vibration value (MTVV) is calculated to quantify the driving comfort level. Taking a representative vehicle as the test subject, simulations are conducted on many urban roads with different roughness values. During the simulations, the effects of speed, time duration, wheel path are investigated. The power function regression model is 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 a significant impact on driving comfort prediction, MTVV is more sensitive to pavement roughness at a higher speed. Finally, the correlation between 2s-MTVV and DRI is adopted for driving comfort prediction. The thresholds of DRI representing the comfort levels are proposed based on the standard comfort level in ISO 2631-1. The results can reliably support the driving comfort prediction on urban road and vehicle driving assistance.
关丽敏1,汪贵平1,朱进玉1,吴荻非2. 基于离散平整度指数的城市道路舒适性预估方法[J]. 振动与冲击, 2021, 40(24): 236-242.
GUAN Limin1, WANG Guiping1, ZHU Jinyu1, WU Difei2. Prediction of driving comfort on urban road based on discrete roughness index. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(24): 236-242.
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