加速度变化对道路平面线形行车舒适性评价方法

An Evaluation Method of Riding Comfort of Road Alignment with Acceleration Change

公路行车舒适性与平面道路线形密切相关,在分析车辆在不同道路线形下运行特性的基础上,提出采用加速度和加速度变化对道路平面线形舒适性评价的方法,阐述横向加速度、轴向加速度与舒适性的关系及评价指标。通过分析加速度的变化对舒适性的影响,建立加速度变化率模型和加速度干扰模型。用加速度干扰表示速度摆动大小和变化频繁度,给出在直线、缓和曲线、圆曲线路段上加速度干扰的离散化模型。通过对不同道路线形的实例仿真,定量分析加速度变化率对舒适性的影响,以加速度干扰大小分析不同线形路段条件对行车舒适性的影响程度及变化趋势,并针对不同道路线形给出提高舒适性的改善方法。仿真结果表明,该评价方法为检验道路平面线形舒适性提供了参考依据。

Highway ridding comfort and road alignment are closely related. A new method that evaluatesthe comfortableness of highway plane alignment with acceleration and acceleration change is put forwardbased on the analysis of the vehicle running characteristic under different road alignment. The relatioshipamong the axial acceleration, lateral acceleration and comfortableness and the evaluation index are ex-pounded. The acceleration changing rate model and acceleration noise model are deduced through the a-nalysis of the influence of change acceleration to ridding comfort. The acceleration noise is used to meas-ure the change size and oscillation frequency of speed, and the discretization model of acceleration noiseon the straight, cyclotron and circular curve segment are deduced. A simulation example with differentroad alignment is given, and the influence of acceleration changing rate to the ridding comfort is ana-lyzed. The changing trend of the acceleration noise is also analyzed on the different plane alignmentroads, and the methods of improving the riding comfort are given. Results show that it is a new evalua-tion method for riding comfort, which provides a reference for the inspection and evaluation of the com-fortableness of roacl geometric alignment.