本文解释了其它变量 u,v,w…对函数 Y=f(x)的建立所产生的影响 ,即相关性的概念。这些变量是在机加工过程中 ,由于原材料或加工工艺自身变化而导致的 ,是不可避免的。在对相关性进行解释时 ,值得关注的问题是 :机加工过程输出的不仅仅是个体零件 ,还有一系列与工件以及加工工艺有关的、可以测量的本征的或非本征的变量。为达到设计物理性能以及至少两个与该物理性能相关的、可以测定的性能 ,应设计一种测量材料物理性能的工艺模型。模型进一步假设 :一种测量方法是对材料设计性能进行测定的常规方法 ,另一种是基于现代化技术发展起来的检测方法。这种检测方法 (NDT)对材料是无损的 ,且检测速度更快。文章谈及了以全新的无损检测方法取代常规测定方法时所遇到的问题 ;应用这种 NDT测量方法以建立 NDT指标与设计物理性能或是与常规的测量方法之间的相关性 ;文章还从概念和工作模式两方面对工业生产中的实例进行了分析 ;阐述了建立相关性的最佳程序 This paper explains the effect of other variables u, v, w ... on the establishment of the function Y = f (x), ie the concept of relevance. These variables are inevitable in the machining process due to changes in the raw materials or processing technology itself. An interesting issue to be drawn in the explanation of the correlation is that the machining output outputs more than just individual parts, but also a series of measurable intrinsic or extrinsic variables related to the part and the machining process. To achieve design physical properties and at least two properties that can be measured in relation to the physical properties, a process model should be designed to measure the physical properties of the material. The model further assumes that one measurement method is a conventional method of measuring material design performance and the other is a detection method developed based on modern technology. This method of detection (NDT) is non-destructive to materials and provides faster inspection. The article addresses the problems encountered when replacing conventional measurement methods with new nondestructive testing methods; the application of this NDT measurement method to establish the correlation between NDT indices and design physical properties or with conventional measurement methods; An analysis of examples in industrial production from both conceptual and working models; elaborates on the best procedure for establishing relevance