Active damping enhancement of flexible intelligent truss structures

Abstract

An Modal filter based Independent Modal Space Control (IMSC) method is proposed for active damping enhancement of a flexible space intelligent truss structure. Modal Filter (MF) is used to extract modal states from response measurement. The MF is developed for the structures with closely spaced modes, or even repeated frequencies. Modal acceleration can then be extracted form physical acceleration measurements via MF. A modified Leunberger observer is adopted to estimate modal displacement and modal velocity from modal acceleration. The MF-based IMSC method is employed to enhance damping of the space intelligent truss structure with active members. A real- time computer control system is developed to implement the MF- based IMSC strategy. Experimental results demonstrate that the intelligent structure design is successful and the active control method is effective.