Abstract: In the design and active vibration control of adaptive truss structures, the determination of active members locations is a very important issue. In order to find the optimal placements of active members in adaptive truss structures, a concept of closed modal dissipation energy ratio is developed in this paper, which can be used to evaluate the distribution of the active damping introduced in the active members vibration control to structural modal damping. On the basis, a multi objective optimization problem is built for the active members placements. The optimal computation of a planar adaptive truss structure demonstrates that the method presented here is feasible and available.

Key words: optimal placement, active vibration control active member, adaptive truss structure