Grain-Size Distributions and Their Conversion Formula Under Different Processing Methods

Wear particle concentration, as important numerical information available in Ferrography, is one of the key indexes in wear diagnosis. Previous studies have shown the concentrations of wear particles and the connotations of concentration are usually not clear enough. This usually leads to large errors or even mistakes in analysis. Generally speaking, the connotations of the particle concentration can be grouped into three categories—the frequency of different wear sizes, the coverage area of different wear sizes, and the mass of different wear sizes. Under condition that grain-size distribution obeys to the Weibull distribution: (1) Discussing the practical significances of three Weibull distribution parameters in oil analysis; (2) Supplying further analyses on the grain-size distribution; (3) Analyzing the similarities and differences between the three types of distributions under different connotations and figuring out the conversion formula of them; (4) Describing the efforts on the grain-size distribution between different methods to obtain equivalent diameter.