产品几何技术规范(GPS)-群体规范(ISO 18391:2016)

[中文适用范围]： 本国际标准建立了建立和指定总体规格的规则，用于指定根据从工件总体中的每个工件获得的一组特征值确定的总体特征的条件。 总体规范（因为它适用于被视为集合而不是单个项目的工件总体）可以被视为对单个规范的补充要求（因为它适用于被视为单个项目的每个工件） 。 总体规格表达了用于工件总体的统计假设。 注 1：人口规范是单个 GPS 规范的补充。 注2：本国际标准无意规定任何特定的公差方法或规定计算公差值的方法。 他们的目的是定义允许制定人口规格的工具。 [外文原描述]： ISO 18391:2016 defines rules to establish and to indicate population specifications, which are used to specify conditions on population characteristics, which are established from a set of characteristic values obtained one on each workpiece of a population of workpieces. A population specification (as applied to a population of workpieces considered as a collection and not as individual items) can be seen as a complementary requirement to the individual specification (as applied to each workpiece considered as individual items). Population specifications express the statistical hypotheses used on the population of workpieces. NOTE 1 A population specification is a complement to an individual GPS specification. NOTE 2 ISO 18391:2016 is not intended to mandate a given tolerancing method or how to calculate tolerance values. Its intent is to specify tools to allow the expression of population specifications.