Investigation of drilling parameters on hybrid polymer composites using grey relational analysis, regression, fuzzy logic, and ANN models: a critical note

Abstract

In the 40th volume of the Journal of the Brazilian Society of Mechanical Sciences and Engineering, a paper entitled “Investigation of drilling parameters on hybrid polymer composites using grey relational analysis, regression, fuzzy logic, and ANN models” was published. The current study identifies a discrepancy between the grey relational analysis (GRA)’s formula used in that paper. The study identifies the incorrect definition of GRA to be the source of the discrepancy.