This study deals with the analysis and usefulness of the material ratio curve. The parameters obtained from this curve are presented. The most popular of these parameters include two groups that are derived from this curve and provided in the ISO 13565–2 (Rk) and ISO 13565–3 (Rq) standards. They are compared by considering their practical significance and sensitivity to measurement errors. The parameters in the Rk family can easily be calculated but are ambiguous, which leads to errors in their calculation. The Rq group, which is based more on theoretical logic, must be applied with great care because of the problems with the Rpq parameter calculation and approximation of the material ratio probability plot. The methods of obtaining the correct oil capacity and its relation with the transition point between the central and valley surface parts are presented. The application of the material ratio curve in low-wear assessment is discussed.

这项研究涉及材料比率曲线的分析和有用性。给出了从该曲线获得的参数。这些参数中最受欢迎的参数包括从该曲线得出的两组，并在ISO 13565-2（Rk）和ISO 13565-3（Rq）标准中提供。通过考虑它们的实际意义和对测量误差的敏感性进行比较。Rk系列中的参数很容易计算，但是模棱两可，从而导致计算错误。由于Rpq存在问题，因此必须格外小心地应用更多基于理论逻辑的Rq组参数计算和物料比率概率图的近似值。提出了获得正确的油容量的方法及其与中部和谷部之间的过渡点的关系。讨论了材料比曲线在低磨损评估中的应用。