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Simplified aeroelastic modeling of horizontal axis wind turbinesCertain aspects of the aeroelastic modeling and behavior of the horizontal axis wind turbine (HAWT) are examined. Two simple three degree of freedom models are described in this report, and tools are developed which allow other simple models to be derived. The first simple model developed is an equivalent hinge model to study the flap-lag-torsion aeroelastic stability of an isolated rotor blade. The model includes nonlinear effects, preconing, and noncoincident elastic axis, center of gravity, and aerodynamic center. A stability study is presented which examines the influence of key parameters on aeroelastic stability. Next, two general tools are developed to study the aeroelastic stability and response of a teetering rotor coupled to a flexible tower. The first of these tools is an aeroelastic model of a two-bladed rotor on a general flexible support. The second general tool is a harmonic balance solution method for the resulting second order system with periodic coefficients. The second simple model developed is a rotor-tower model which serves to demonstrate the general tools. This model includes nacelle yawing, nacelle pitching, and rotor teetering. Transient response time histories are calculated and compared to a similar model in the literature. Agreement between the two is very good, especially considering how few harmonics are used. Finally, a stability study is presented which examines the effects of support stiffness and damping, inflow angle, and preconing.
Document ID
19830013238
Document Type
Contractor Report (CR)
Authors
Wendell, J. H.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Date Acquired
September 4, 2013
Publication Date
September 1, 1982
Subject Category
Energy Production And Conversion
Report/Patent Number
DOE/NASA/3303-3
NASA-CR-168109
MIT-ASRL-TR-197-4
NAS 1.26:168109
Funding Number(s)
CONTRACT_GRANT: NSG-3303
CONTRACT_GRANT: DE-AI01-76ET-20320
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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