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Effects of pretwist and presetting on coupled bending vibrations of rotating thin-walled composite beams. (English) Zbl 1044.74018
Summary: We present a refined dynamic theory of rotating blades modeled as anisotropic composite thin-walled beams, experiencing the flapping-lagging-transverse shear coupling. The structural model encompasses a number of non-standard features, such as anisotropy and transverse shear, pretwist and presetting angles, the presence of a rigid hub on which the beam is mounted, and the rotatory inertia. The developed theory and the methodology used to determine eigenfrequency characteristics are validated against the results available in the literature, and new results are given which emphasize the influence of ply-angle, pretwist and presetting, coupled with rotating speed, on blade free vibration characteristics.

74H45 Vibrations in dynamical problems in solid mechanics
74K10 Rods (beams, columns, shafts, arches, rings, etc.)
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