In this paper, we propose a method to estimate the missing part of data and show effectiveness. We describe the number of appropriate modes for improving estimation accuracy, the number of iterative calculations, and how to determine the initial value.In recent years, there have been lots of attention in the use of membranes for large space structure applitions. Typical applications include sunshields, parabolic reflector, solar concentrators, and solar sails. In order to predict the membrane dynamics precisely, it is necessary to use the on-orbit measurement data. However, the on-orbit sail membrane measurement data are incomplete(missing spatio-temporal data) because of sensor placement limitations and sunlight reflection. This paper proposes an estiomation method in which current incomplete measurement data are used to estimate membrane dynamics. Further, the applocabillty of the proposed estimation method is evaluated via microgravity experiments and numerical model data. The experimental model used comprises a spin deployable space membrane structure consisted of a square membrane, a center hub, and tethers.
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