Multi-Degree-of-Freedom Active Isolation Platform for Microvibrations

Abstract

Reaction wheels are widely used in the attitude control of spacecraft due to their capability of applying control torques, greatly reducing the propellant requirements and limiting its use to reaction wheel desaturation. However, the presence of unavoidable mechanical imperfections results in significant mechanical disturbances, being applied to the spacecraft, which can severely impact the operation of sensitive payloads. These microvibrations are broadband in nature, and therefore the effective mitigation of their effects requires a high isolation factor throughout a wide frequency range. This paper presents the development and experimental verification of a six-degree-of-freedom active isolation platform for a reaction wheel, integrating a soft suspension and active control using self-sensing actuators. A reduction in the transmitted forces of 65 dB at 270 Hz was experimentally demonstrated, while exhibiting negligible amplifications by its suspension resonance, which constitute very attractive performances.

Research on a novel strategy of vibration isolation for time-variant payload

“…However, inflating to compensate the overloaded force leads to the rise of the gas stiffness, and it will weaken the performance of vibration isolation [6], especially for condition with immense overload. Hence extra actuator and control strategy should be introduced to overcome the problem and electromagnetic actuator is the choice of most condition [7][8][9]. In the field of vibration control, the SHD control can realize a satisfy performance and it is utilized to apply for various equipment.…”