SOME THEORETICAL ASPECTS REGARDING ACTIVE VIBRATION CONTROL.

An active control of vibration for a mechanical system involves the introduction an external source to perform its function to reduce vibration and noise level, such as for example, use of hybrid absorbers with controlled force to reduce the influence of seismic waves or wind power on buildings or mechanical structures, noise reduction in the cabin of an aircraft by reducing vibration of the large panels and thin metal forming booth walls; reduction of vibrations level using piezoelectric or electromagnetic devices mounted on the trailing edge of helicopter blades, devices tuning cars, etc. In this paper we are presented main active vibration control techniques currently employed to control of natural frequency in aim to reduce the effects of vibration by changing damping, stiffness or inertia of the system. [ABSTRACT FROM AUTHOR]