Fax: (818) 393-4440 spano s@ c s i Abstract The paper presents analytical and experimental results with a 6-axis actively controlled vibration isolator. The isolator was designed to attenuate vibrations from reaction wheels, cryogenic coolers and other noisy machines located on board precision optical-class spacecraft. It consists of six active struts each of which includes an electromagnetic voice coil actuator in parallel with a soft spring. Six decoupled analog controllers were used to close broad-band feedback loops around six force sensors and the isolator multi-axis transmissibility was measured with twelve accelerometers (six on the noisy side and six on the quite side). Experimental results show a ten-fold improvement in performance over passive isolation alone.

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This paper describes the design and performance testing of a vibration isolation and suppression system (VISS) which can be used to isolate a precision payload from spacecraft borne disturbances. VISS utilizes six hybrid isolation struts in a hexapod configuration. Central to the concept is a novel hybrid actuation concept which provides both passive isolation and active damping. The passive isolation is provided using a flight proven D-strut design. The passive design is supplemented by a voice coil based active system. The active system is used to enhance the performance of the passive isolation system at lower frequencies, and provide the capability to steer the payload.

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