Theoretical and Experimental Study on an Active–Passive Integrated Variable Stiffness Vibration Isolator

다국어 초록 (Multilingual Abstract)

Optical imaging spacecraft needs adaptable vibration isolators to convey maneuvering forces stably and attenuate disturbances effectively, especially under multiple-level on-orbit working conditions. This paper proposes an active–passive integrated variable stiffness vibration isolator (API-VSVI), which employs a heterogeneous-signal fixed-step least mean square (HS- FSLMS) algorithm, to provide the necessary adaptability. Furthermore, the actuator’s capacity requirements can be further optimized based on the stiffness adjustment method. The API-VSVI prototype was firstly introduced, and the dynamic model was subsequently developed based on the derived equation of the stiffness. Then, the HS-FSLMS algorithm was proposed to simultaneously process the displacement and force signals for two different goals concerning different frequency bands.
Through the comparative study of parameters, the appropriate range of the dynamic and control parameters was analyzed, following which one stiffness adjustment method was proposed according to the discussion on multilevel input modes. Finally, it was demonstrated by experiment results that the API-VSVI outperformed the VSVI in shaping the transmitted force. It appears that the maneuvering force amplification is actively regulated at less than 4%, and the disturbance suppression is improved to 92.7% by lowering the stiffness and then actively controlled to 98.5%.