A refined one-dimensional beam formulation based on a mixed approach has been developed for structural dynamics analyses of rotating and nonrotating composite beams and blades of general section shape with open- or closed-section contours. The theory uses a mixed variational approach and accounts for the effects of elastic coupling, shell-wall thickness, warping, warping restraint, and transverse shear deformations. The analysis is validated against experimental data and other analytical results for composite cantilevered beams of various cross sections. Good correlation is achieved for all of the cases considered. The influence of wall thickness and transverse shear on the free vibration characteristics of composite beams with either bending-torsion or extension-torsion coupling is investigated. For a bending-torsion coupled beam, the influence of wall thickness becomes important when the thickness-to-depth ratio of the beam reaches about 30 %. The frequency error in neglecting transverse shear fIexibility is about 50 % for a bending-torsion coupled composite box beam with a slenderness ratio of 5.
Refined structural dynamics model for composite rotor blades
Ein verfeinertes strukturdynamisches Modell für Verbund-Rotorblätter
AIAA Journal ; 39 , 2 ; 339-348
2001
10 Seiten, 15 Bilder, 7 Tabellen, 32 Quellen
Article (Journal)
English
Rotor (Drehflügel) , Verbundbauweise , Simulationsmodell , dynamisches Verhalten , numerische Analysis , geometrische Form , Variationsrechnung , elastische Eigenschaft , Wanddicke , Schubverformung , Theorie-Experiment-Vergleich , Kragträger , Validierung , Korrelation , Verwindung (Torsion) , Frequenzbereich , Fehlerbetrachtung , Strukturdynamik
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