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• W2330115447 abstract "Pliant membrane materials have significant interest for applications in micro air vehicles flexible wings. This paper presents an experimental characterization of a latex hyperelastic membrane in static and dynamic conditions as a validation tool for finite element analysis (FEA) models. The membranes are attached to a circular steel ring and set at different pre-tension levels and loaded using steel spheres of different sizes placed at the center of the membrane. The pre-strain elastic energy and the deformation at the center of the membrane are measured by visual image correlation, a non-contact measurement system. A good correlation is found among the deflection and strain energy of the membrane computed by experimental and FEA models, although discrepancy is expected among experimental and FEA model results within reasonable limits due to the variation of the thickness of the membrane. The membrane structural dynamics characteristics are analyzed performing experimental modal analysis imposing a structural excitation to the ring in ambient pressure conditions and in reduced pressure in a vacuum chamber. The three-dimensional shape of the membranes during a burst-chirp excitation at different pre-tension levels is dynamically measured and recorded and the natural frequencies are computed by performing the fast Fourier transform of the out-of-plane displacement at several points of the circular membrane. Experimental results show that the natural frequencies increase with mode and pre-tension of the membrane, but decrease at higher ambient pressure. The natural frequencies of the membrane at different pre-tension levels are computed at vacuum by the preliminary FEA model." @default.
• W2330115447 created "2016-06-24" @default.
• W2330115447 creator A5021905493 @default.
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• W2330115447 date "2010-04-12" @default.
• W2330115447 modified "2023-09-25" @default.
• W2330115447 title "Experimental and Finite Element Modal Analysis of a Pliant Membrane for Micro Air Vehicles Wings" @default.
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• W2330115447 doi "https://doi.org/10.2514/6.2010-2710" @default.
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