宇宙用伸展ブームの非線形振動特性

抄録

Since the size and weight of spacecraft structures installed on the spacecrafts are strictly limited, various types of extendable booms have been developed. To devise the weight reduction and simplification of the mechanisms, recent extendable booms can be stowed by elastically flattening the cross sections and wrapping around hubs and can be deployed by the restoring forces. These booms exhibit nonlinearity due to large deflections as well as nonlinearity in bending stiffness due to the changes of the cross-sections. In this paper, examples of space lightweight extendable booms are briefly explained and braided bi-convex booms developed in Japan and examined in this study are introduced. Then the results of measurements of the nonlinear bending stiffness and nonlinear vibration characteristics and the deployment experiment of the booms wrapped around a hub are summarized. Then the modeling of the nonlinear bending stiffness and deployment simulation employing the multiple particle approximation method are explained.