High Precision Simulation of Large Deployable Membrane Space Structure and Formulation of Similarity Rule

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Membrane has excellent property for deployable light structure, and has been expected as large deployable space structure. If membrane is applied to the large deployable space structure, there are several structural design problems as follows; (a) very small wrinkles and plastic fold lines, and the frictional self-impact of the membrane will be possibly give undesirable influence on the dynamics of the large membrane, (b) the dynamic stability of the membrane after the deployment is not guaranteed, (c) there is no appropriate similarity rule on the dynamics of membrane between the flight model (〜100m) and the experimental model that is available on the ground (〜20m). This research has aimed at proposing the method to get the valuable knowledge quantitatively about these three problems. The research results are summarized as follows;(1) Formulation of similarity rule : The equation of motion is formulated which includes the effect of the disturbances applied to the membrane on orbit or in the ground experiment. Using the equation, the similarity rule was derived. The validity of the formulated similarity rule was shown by the experimental results.(2) Parametric study of the membrane motion : The investigator had developed a highly precise FEM code "NEDA" to simulate the deployment of membranes. The investigator conducted the simulation by using the commercial software "ABAQUS" as well as "NEDA", and evaluated the influence of the mass-distribution, fold-pattern on the deployment and the stability after the deployment.(3) Verification of the wrinkle model: The investigator proposed the numerical model of the wrinkle that enables us the efficient simulation of the membrane. The validity of the proposed wrinkle model is shown by comparing the proposed model and the shell element model.(4) Evaluation of the folding and deploying method : The synthetic evaluation method was proposed concerned with the folding and deploying method.