A Dynamic Finite Element (DFE) formulation for coupled Flap - Lead-Lag bending free vibrations of rotating pre-twisted propeller blades is presented. The weighted residual approach, together with analytical expressions of uncoupled bending dynamic shape functions, are used to obtain the frequency dependent stiffness matrix corresponding to the coupled vibration of a blade element. The dynamic shape functions are found based on the dynamic basis functions, which are the homogeneous solution of the uncoupled uniform axially loaded beam element differential equations of motion. Numerical verification has demonstrated the practical applicability of the theory by the coupled natural frequencies obtained for a scaled cantilever propeller blade.
Dynamic Finite Element (DFE) formulation for coupled flap-lag vibrations of propeller blades
2000
9 Seiten, 17 Quellen
Aufsatz (Konferenz)
Englisch
A Dynamic Finite Element (DFE) Formulation for Coupled Flap-Lab Vibrations of Propeller Blades
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