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Joosten, Sebastiaan (author), Radaelli, G. (author), Vallery, H. (author)Inspired by phenomena in the plant world, a meteoro-sensitive rotational actuator is developed. The design uses a hygro-active shell, whose water-based swelling is restricted at selective locations to form a helicoid structure. The influence of geometrical parameters on the performance is investigated using a numerical analysis of various...journal article 2021