Vibration and noise in the environment or industry are caused by partic-ular processes where dynamic forces excite structures. The effects of noise andvibration range from annoyance, fatigue and reduced comfort, safety problems andeven health hazard. On machines, vehicles and buildings the effect may be wear,faulty operation or any degree of irreversible damage. Friction-induced vibrationis a serious problem in many industrial applications. It can cause excessive wear ofcomponents, surface damage, fatigue failure, and noise. As a trial to understandthe problem of friction, noise and vibration, this study investigates the relation be-tween friction and noise under self-excited vibration and with external excitation.In the experimental part of this study, a new set-up of a pin-on-disc apparatus isconstructed to give a basic understanding of friction-induced noise and vibration.For the particular pin-on-disc apparatus considered here, an attempt was madefor a simple dynamic model based on linear, undamped rigid bodies in terms ofa three degree-of-freedom analysis. It was found that, the average normal forceis one of the parameters which cause instability to the system beside the systemphysical stiffnesses parameters. The noise levels are recorded up to frequenciesof 6.4 kH z under different loads and speeds, with and without external vibrationexcitation. Time trace of the average normal and friction forces are recorded atdifferent conditions. A statistical analysis of the experimental results is performedunder different test conditions. The results indicate that the average normal forcehas a significant effect on generating noise under self-excited vibration; differentnoise levels are observed as the average normal force is changed. For the sameaverage normal force range the~xperimental data demonstrated that, introducingexternal excitation to the system decreased both the average coefficient of frictionand sound pressure levels in comparison with the results of self-excited vibrationcase.