INVESTIGATION OF NOISE CHARACTERIZATION OF COATED ROTORS.

In this study, four excessive worn brake rotors of a light commercial vehicle are coated using different thickness, methods and powder coatings. Coated rotors (R 1 , R 2 , R 3 and R 4) compared with OEM brake rotor (R 0) in terms of friction coefficient (μ) and braking noise. Three braking test procedures (bedding, hot judder I and II) are applied to five rotors using inertia brake dynamometer. Results in bedding testing procedures showed that R 0 rotor provided higher brake noise and higher μ compared with coated rotors. In hot judder I testing procedures, R 4 rotor provided higher μ and higher brake noise compared with the other coated rotors and R 0. Also, in hot judder II testing procedures, R 2 rotor provided higher μ compared with the other rotors, R 0 provided higher brake noise compared with the other coated rotors. In addition, based on experimental data, noise levels are estimated by multiple regression method with dummy variables. [ABSTRACT FROM AUTHOR]