1.1 本规程描述了根据试验方法获得的基本磨损数据的基本线性回归分析 F421 和试验方法 F762 . 1.2 通过试验方法中所述的程序测量沟槽深度损失，获得基本的磨损数据 F421 根据试验方法进行一系列试验循环（规定条件下的试验距离）后 F762 . 1.3 对平均轮胎花纹深度与安装测试轮胎的测试车辆行驶的测试距离之间的关系进行线性回归分析。通过该分析确定了磨损率:单位距离的槽深损失。 1.4 线性磨损定义为磨合后基本恒定的磨损率，其导致线性回归确定系数， R 2. ，等于或大于0。 95当获得数据集时，其中测量间隔的数量， n ，至少为3。每个测量间隔代表一个特定的测试距离。 1.5 本规程不适用于非线性或不规则胎面磨损轮胎的胎面寿命预测。 1.6 给出了SI和英寸磅单位的评估参数；两者均可使用。定义的评估参数是轮胎测试行业中通常使用的参数，没有特别声明这些参数和术语相对于可能开发的其他术语和参数的优越性。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 本规程的目的是规范一些常用于表征脚面磨损的术语和指标的含义和推导。 5.1.1 我们无意推荐两个耐磨性能指标中的任何一个:单位距离的胎面深度损失或单位距离的胎面深度损失。

1.1 This practice describes the elementary linear regression analysis of basic treadwear data as obtained according to Test Method F421 and Test Method F762 . 1.2 The basic treadwear data are obtained as groove depth loss measurements by procedures described in Test Method F421 after a series of test cycles (test distances under specified conditions) according to Test Method F762 . 1.3 A linear regression analysis is performed for the relationship between average tire tread depth and the test distance traveled by the test vehicle, on which the test tires are mounted. From this analysis a rate of wear is determined: groove depth loss per unit distance. 1.4 Linear treadwear is defined as an essentially constant rate of wear, after break-in, which results in a linear regression coefficient of determination, R 2 , equal to or greater than 0.95 when obtained for a data set where the number of measurement intervals, n , is at least 3. Each measurement interval represents a specific test distance. 1.5 This practice is not applicable to the prediction of treadlife for tires that exhibit non-linear or irregular treadwear. 1.6 Evaluation parameters are given for both SI and inch-pound units; either may be used. The evaluation parameters as defined are ones typically used in the tire testing industry and no special claim is made for superiority of these parameters and terms over other terms and parameters that may be developed. 1.7 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 The purpose of this practice is to standardize the meaning and derivation of some terms and indexes that are commonly used to characterize treadwear. 5.1.1 There is no intent to recommend either of the two treadwear performance indexes: distance per unit loss of tread depth or loss of tread depth per distance unit.