1.1 本实施规程描述了创建统计预测轮廓仪的程序，该轮廓仪可用于识别径向充气轻型卡车（LT）轮胎直径为1.707 m的实验室车轮表面与平坦或公路表面之间的等效测试严重性条件。 1.1.1 对于这两种测试条件，定义为某些特定内部轮胎位置的运行或运行温度的轮胎运行严重程度是不同的。由于曲率效应，在相同负载、速度和充气压力条件下，对于实验室车轮，它通常更高。 1.1.2 本实施规程适用于轻型卡车轮胎在载重范围E以上的特定运行条件，适用于在具有车辆额定总重(GVWR)的车辆上使用的此类轮胎 ≤ 4536公斤（10,000磅）。1.1.3 第节完整概述了实践程序有效和有用的具体操作条件 6 、本标准的（限制）。 1.2 预测轮廓仪基于经验开发的线性回归模型，该模型是从大型数据库的分析中获得的，该数据库是从典型子午线轻型卡车（LT）轮胎的车轮和平表面测试的综合实验测试计划中获得的。见第节 7 以及研究报告 2 了解更多详情。 1.3 对于本标准，除非另有说明，否则应使用SI单位。 1.4 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ======意义和用途====== 5.1 历史上，轮胎已经通过各种测试方法进行耐久性测试。一些典型的测试方案是: (1) 试验场或高速公路测试范围内的速度、负载和充气， (2) 对车队进行长时间测试，以及 (3) 对装载在直径为1.707米的旋转车轮上的轮胎进行室内（实验室）测试；然而，直径为1.707米的车轮的曲面导致轮胎行为与在平坦或公路表面上观察到的明显不同。5.1.1 本实施规程解决了在直径为1.707米的车轮表面之间的一系列典型轮胎运行条件下提供等效测试严重性的需要（实施规程 F551 )和平坦表面。当加载到弯曲表面与平坦表面上时，轮胎足迹存在不同的变形，导致不同的足迹力学、应力/应变循环和显著不同的内部工作温度。由于轮胎内部温度是在典型使用条件下影响轮胎耐久性或操作特性的关键参数，因此能够针对一系列负载、充气压力和转速（速度）计算弯曲表面和平坦表面之间的内部温差是重要的。 5.2 将来自实验室和道路轮胎温度测量试验的数据结合起来，进行统计分析，并得出轮胎温度预测模型。2 5.2.1 模型对数据的拟合显示为决定系数R 2 ，对于关键皮带边缘: R 2 =0.90 两个标准偏差（2-sigma）=3.2°C （即与平均值的95%变化 在±3.2°C范围内） 5.2.2 这些预测模型用于开发第节中概述的预测剖面仪 7 和 附件A1 .

1.1 This practice describes the procedure to create statistical prediction profilers which can be used to identify equivalent test severity conditions between a 1.707-m diameter laboratory roadwheel surface and a flat or highway surface for radial pneumatic light truck (LT) tires. 1.1.1 Tire operational severity, as defined as the running or operational temperature for certain specified internal tire locations, is not the same for these two test conditions. It is typically higher for the laboratory roadwheel at equal load, speed and inflation pressure conditions due to the curvature effect. 1.1.2 The practice applies to specific operating conditions of light truck tires up through load range E for such tires used on vehicles having a gross vehicle weight rating (GVWR) ≤ 4536 kg (10 000 lb). 1.1.3 The specific operating conditions under which the procedures of the practice are valid and useful are completely outlined in Section 6 , (Limitations) of this standard. 1.2 The prediction profilers are based on empirically developed linear regression models obtained from the analysis of a large database that was obtained from a comprehensive experimental test program for roadwheel and flat surface testing of typical radial light truck (LT) tires. See Section 7 and the research report 2 for more details. 1.3 For this standard, SI units shall be used, except where indicated. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 Historically, tires have been tested for endurance by a variety of test methods. Some typical testing protocols have been: (1) proving grounds or highway testing over a range of speeds, loads, and inflations, (2) testing on fleets of vehicles for extended periods of time, and (3) indoor (laboratory) testing of tires loaded on a rotating 1.707-m diameter roadwheel; however, the curved surface of a 1.707-m diameter roadwheel results in a significantly different tire behavior from that observed on a flat or highway surface. 5.1.1 This practice addresses the need for providing equivalent test severity over a range of typical tire operating conditions between a 1.707-m diameter roadwheel surface (Practice F551 ) and a flat surface. There are different deformations of the tire footprint when loaded onto curved surfaces versus flat surfaces resulting in different footprint mechanics, stress/strain cycles, and significantly different internal operating temperatures. Since tire internal temperatures are key parameters influencing tire endurance or operating characteristics under typical use conditions, it is important to be able to calculate internal temperature differentials between curved and flat surfaces for a range of loads, inflation pressures and rotational velocities (speeds). 5.2 Data from lab and road tire temperature measurement trials were combined, statistically analyzed, and tire temperature prediction models derived. 2 5.2.1 The fit of the models to the data is shown as the coefficient of determination, R 2 , for the critical belt edge: R 2 = 0.90 Two Standard Deviations (2-sigma) = 3.2°C (that is, 95 % of the variation from the means is within ±3.2°C) 5.2.2 These prediction models were used to develop the prediction profilers outlined in Section 7 and Annex A1 .