Research on Adaptive/Smart Space Structures.

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To extend and to improve our theoretical studies of smart structures, i.e., soft docking of space structures, damping capacity of hybrid composite lamina embedded with shape memory alloy (SMA) wire, and optimal control of unstable motion of tethered satellite system on an orbit around the earth, we performed the following researches.1. In regard to the soft docking of the space truss-type variable geometry structure, we proposed an improved artificial potential method, in which an end effector takes a pathe along an assigned straight line to the contact point, having an final attitude and tracking an assigned velocity change of the effector, keeping an assigned attitude of the main structure.2. We examined the mechanical behaviors of SMA,especially the stress-strain-temperature relations and stress induced martensitic transformation. We estimated the damping capacity of SMA and analyzed the effect of the embedded SMA wire upon the damping capacity of hybrid composite lamina and the vibration problems of a sandwich plate with SMA skin and of SMA beams. We also investigated the constitutive relation of SMA and proposed a new theory in which we derived theoretically the pseudoelastic stress-strain relation of SMA introducing an interaction energy.3. We performed reconsideration of the nonlinear vibration of the tethered satellite and improved the optimal control of the length of the tethered satellite system.