Dynamic Characteristics of Active Two-Loop Vibration Protection Devices with Suppressed Resonance of the Carrier Plate

The dynamic characteristics of active vibration protection devices, consisting of a carrier plate (mounted on elastic supports), a symmetrical group of accelerometers, service-propulsion devices, and electrical circuits that separately control six vibration modes of the plate, are studied. The system is characterized by a phase reduction of 180° in the field of mechanical resonance of the slab and the same phase decrease caused by the electromechanical resonance of the service propulsors. In order to ensure that phase limitations do not reduce the efficiency of the device (the width of the active frequency range, the transmission coefficient of vibrations), two-loop control circuits have been developed that suppress the resonance of the carrier plate. Such devices achieve the following parameters: noise transmission coefficient ≈–60 dB, active frequency range 0.2–400 Hz for terrestrial laboratory/shop applications and 0.02–200 Hz for spacecraft applications.