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Shape characteristics of granular materials precisely classified by a shape separator

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The shape separator previously reported consists of a rotating tilted cylinder with a row of blades. It can separate various shapes of granular materials according to the critical rotational frequency. In the present study, a test sample is precisely classified into particle groups according to the critical rotational frequency and the shape characterization is conducted for individual particles of each group by measuring their shapes from orthogonal three directions. It is found that the test sample is so precisely classified that one cannot distinguish the particle groups from each other by average shape descriptors; Mahalanobis' distance in the discriminant analysis is useful for this purpose. The critical rotational frequency is more sensitive to the multi-variate shape descriptors than the single-variate ones in the case of the geometric shape.

Affiliations: 1: Department of Energy Engineering, Toyohashi University of Technology, Tempaku-cho, Toyohashi 440, Japan


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