Experimental Investigation on the Friction-Induced Vibration with Periodic Characteristics in a Running-In Process under Lubrication

Table 1

The parameter values.

Parameter	Physical meaning	Values
k	The ellipticity parameter [32]	1
η	The absolute viscosity of the lubricant	0.139 Pa·s
μ	The mean velocity between the friction pairs	0.0333 m/s
P	The normal load	100 N
Ra	The radius of the ball specimen	3 mm
Rb	The radius of the disk specimen	Infinite
	Poisson’s ratio of the steel ball	0.3
	Poisson’s ratio of the disk	0.269
Ea	The elastic modulus of the ball	208 GPa
Eb	The elastic modulus of the disk	209 GPa