Active vibration-extinguisher containing magneto or electrorheological fluids, method for reducing vibrations and uses thereof

Present invention relates to a device (1) for reducing vibrations of a vibrating object (1') as well as a method for reducing vibrations, wherein the perturbing vibrations are reduced drastically by induction of counter-forces. In general, vibrations of equal frequency (counter-vibration) as the perturbing vibration are generated. The force generated by the counter-vibration acts onto the vibrating object (1'), whose amplitude of vibration is to be reduced. The phasing of the counter-vibration is antipodal to the vibration to be reduced, preferably the force of the generated counter-vibration is greater than the force being necessary for compensation of the perturbing vibration. The transfer of the force of the counter- vibration onto the vibrating object (1') is affected by means of a magnetorheological or electrorheological material (5), whereby the absolute value of the transmitted force is adjusted by the magnitude of an applied magnetical or electric field. With increasing strength of the magnetical or electric field, the magnetorheological or electrorheological material (5) is stiffened increasingly. With optimal adjustments of the strength of the electric or magnetic field, the transmitted force equals the perturbing force and the perturbing vibration is compensated.