Guaranteed Performance Hierarchical Control for Space Microgravity Vibration Isolation System

To address the demands of dynamic and steady-state performance and vibration suppression in a microgravity environment，a performance-guaranteed hierarchical control vibration isolation strategy is proposed. First， for the control layer of the vibration isolation system，an error transformation function based on prescribed performance and predefined time control is employed，ensuring that the position and attitude errors of the vibration isolation system remain within specified boundaries and effectively suppress microgravity acceleration vibrations. Secondly，for issues of actuator control communication and control allocation in the vibration isolation system，a hysteresis quantizer and a dual neural network quadratic optimizer are introduced. This strategy optimizes the efficiency of control signal transmission，improves the accuracy of actuator output signals，and reduces energy consumption at the execution level. Experimental results indicate that this control strategy significantly enhances the system’s fast response capability and stability，effectively suppressing vibrations in the 0. 1～50 Hz frequency range，with a decay rate of approximately −23. 53 dB per decade.