Dynamic Compensation for the Vibro-Active Forces in the Vibrating Systems

Abstract

The paper presents an active system for isolation of vibration, which compensates for the dynamic forces on the ground arising from the fluctuations of the elastically suspended mass with a vibro-active element by using the inertial forces in the antiphase. As the dynamic forces' compensator an electrodynamic drive is used, in which the linear movement of the rotor with an additional weight is carried out according to the information coming from a force sensor or accelerometer. The principle of the dynamic inertial compensation for the vibratory force boils down to the following: an oscillating mass actuator (compensator) with a mass on a movable body is mounted on the main body and with the reciprocating movement of the mass in an antiphase together with the motion of the elastically suspended vibro-active mass an additional inertial power is created, compensating for the vibro-active force at a given frequency. A possibility of mounting of an electrodynamic compensator is considered in this paper. The compensator is mounted on the oscillating weight, or on the body near the elements of the passive vibration isolation system. The active vibration isolation system with an electrodynamic compensator considered in this work can ensure an effective reduction of the power transmission to the base of the oscillation of the elastically suspended mass by 20-50 dB in the low frequency range.