Table 1.

Parameters of REB model.

Parameters	Value
Number of balls	9
Stiffness of ball	5.96 × 107 ($\raisebox{1ex}{$\mathrm{N}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{m}$}\right.$)
Mass of outer (Kg)	2.7 (Kg)
Stiffness of outer	1.31 × 105 ($\raisebox{1ex}{$\mathrm{N}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{m}$}\right.$)
Mass of shaft (Kg)	1.36 (Kg)
Stiffness of Shaft	23.3 × 106 ($\raisebox{1ex}{$\mathrm{N}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{m}$}\right.$)
Damping	654 ($\raisebox{1ex}{$\mathrm{NS}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{m}$}\right.$)
Ball diameter	$7.940 (\mathrm{mm})$
Pitch diameter	$39.04 (\mathrm{mm})$
Defect size	$7 (\mathrm{mm})$
Defect depth	$2 (\mathrm{mm})$