This paper presents mainly a research in the field of active damping augmentation of a four-bay, four-longern space truss structure in cantilever condition, using one active member placed at various locations in the truss structure based on the desired damping control requirements. The load-carrying active member consists of a stack of concentric piezoelectric wafers as a piezoelectric actuator and a collocated impedance head. Active damping control conducted on the truss structure was realized using collocated velocity feedback around the active member. In this paper, active member placement was determined by introducing modal dissipation energy ratio as an optimal index. Experiments were then performed to evaluate both the effectiveness of the active damping control and active member placement. Comparing the closed-loop response to the open-loop response with respect to various placements of the active member, the experimental results show that it is difficult to find a suitable location to place active member for active modal damping control effective to all modes of interest by using or placing only one active member as a controlling actuator in the truss structure. So, a multi-active-member control scheme is suggested in future research work for improvement of structural performance.
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