Active Vibration Isolation Platform Based on Distributed Vibration Absorption

In order to reduce the impact of micro-vibration on the satellite’s imaging quality, this paper proposes an active vibration isolation platform (AVIP) based on distributed vibration absorption. The AVIP can constrain the relative movement between the upper and the lower platform benefiting from the six rigid connecting rods, and the inner movable assembly installed on each rod in parallel acts as the AVIP’s actuator. Based on the topology of the AVIP, the relationship between the distributed axial force of each rod and the disturbing force and torque on the upper platform was derived. On the basis of the Adaptive Notch Canceller (ANC) control method, a variable step Least Mean Square (LMS) algorithm with the step factor adjustment method is used to calculate the active force. The calculated control force is applied on each rod to counteract the distributed force, which considerably suppress the vibration transmitted from upper platform to the lower platform to a certain extent. Finally, the effectiveness of the AVIP together with the distributed vibration absorption method is significantly validated by the simulation results.