道路车辆摩擦阻力的测量

[中文适用范围]： 本 SAE 推荐实践为用于获取和记录测量值以及分析和呈现在给定道路位置完全踩下制动器的车辆的摩擦阻力测试结果的程序和实践提供了指南。适用于事故现场和试验场，适用于客车、轻卡、货车等车辆在全制动状态下的直线停车，包括传统制动系统车辆和全制动车辆的锁轮打滑情况。或部分防抱死制动系统（ABS）。给定系列测试产生的平均减速度旨在代表进行测试的条件（例如车辆类型、轮胎类型和状况、道路材料和道路表面状况）的摩擦阻力系数。摩擦阻力系数旨在符合方程式 1 中所述的停车距离公式（Fricke，1990）。其中包括两种方法： 停车距离法（测量车辆从静止状态完全停止所需的距离）。已知初始速度）和平均加速度测量（使用加速度测量装置和数据分析来确定平均阻力系数）。推荐做法适用于完全制动状态下停车的车辆。通过其他方式获得的道路摩擦阻力值不一定与整车测试一致或相关（Lock 等，1982），因此不推荐。 [外文原描述]： This SAE Recommended Practice provides guidelines for procedures and practices used to obtain and record measurements and to analyze and present results of frictional drag tests of a vehicle with its brakes fully applied at a given roadway location. It is for use at accident sites and test sites and is applicable to straight-line stopping of vehicles such as passenger cars, light trucks and vans under fully braked conditions including locked-wheel skids for vehicles with a conventional braking system and for vehicles with full or partial antilock braking systems (ABS). The average deceleration resulting from a given series of tests is intended to be representative of a frictional drag factor for the conditions under which the test was conducted such as the type of vehicle, type and condition of tires, roadway material and roadway surface conditions. The frictional drag factor is intended to conform to use with the stopping distance formula (Fricke, 1990) as stated in Equation 1 . Two methods are included: Stopping Distance Method (measurement of the distance required to bring a vehicle to a complete stop from a known initial speed) and Average Acceleration Measurement (using acceleration measuring devices and data analysis to determine the average drag factor). The Recommended Practice applies to vehicles stopping in a fully braked condition. Values of roadway frictional drag obtained by other means do not necessarily agree or correlate (Lock, et al., 1982) with full vehicle testing and are not recommended.Cross Reference: 940722,940918,ASTME274,ASTME445/E445M,ASTME456,ASTME503/E445M,ASTMF403,ASTMF811,J2909_201806,J299,TSB003