Two-stage active vibration isolation system with electrodynamic compensator of vibro active forces

Abstract

The principle of constructing the two-stage active vibration isolation system is considered. In this system the electrodynamic compensator of the vibro active forces is installed on the intermediate frame. The movable mass motion control of compensator is carried out according to information from the absolute displacement sensor of the intermediate frame. The principle of dynamical inertial compensation of force consists in the fact that in the reciprocating motion of the mass of the movable assembly of the compensator the additional inertial force compensating for given frequency the vibro active force will be created. The principal scheme for the electrodynamic compensator control is given, the stability is evaluated. It is shown that the application of the electrodynamic compensator reduce the force transfer to the base by 20–30 dB and shifts the range of vibration isolation effective to the low frequency range (0,5–10 Hz).