Stability analysis of flexible wind-turbine blades using finite-element method
Static vibration and flutter analysis of a straight elastic axis blade was performed based on a finite element method solution. The total potential energy functional was formulated according to linear beam theory. The inertia and aerodynamic loads were formulated according to the blade absolute acceleration and absolute velocity vectors. In vibration analysis, the direction of motion of the blade during the first out-of-lane and first in-plane modes was examined; numerical results involve NASA/DOE Mod-0, McCauley propeller, north wind turbine and flat plate behavior. In flutter analysis, comparison cases were examined involving several references. Vibration analysis of a nonstraight elastic axis blade based on a finite element method solution was performed in a similar manner with the straight elastic axis blade, since it was recognized that a curved blade can be approximated by an assembly of a sufficient number of straight blade elements at different inclinations with respect to a common system of axes. Numerical results involve comparison between the behavior of a straight and a curved cantilever beam during the lowest two in-plane and out-of-plane modes.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge (USA). Aeroelastic and Structures Research Lab.
- DOE Contract Number:
- AI01-76ET20320
- OSTI ID:
- 5612444
- Report Number(s):
- DOE/NASA/3303-2; NASA-CR-168107; ON: DE84002747
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
170602* -- Wind Energy Engineering-- Turbine Design & Operation
AERODYNAMICS
FINITE ELEMENT METHOD
FLEXIBILITY
FLUID MECHANICS
MACHINERY
MECHANICAL PROPERTIES
MECHANICAL VIBRATIONS
MECHANICS
NUMERICAL SOLUTION
STABILITY
TENSILE PROPERTIES
TURBINE BLADES
TURBINES
TURBOMACHINERY
WIND TURBINES