An investigation of methods for reducing blade and system loads for two-bladed teetering-hub horizontal-axis wind turbines
- National Renewable Energy Laboratory, Golden, CO (United States). Wind Technology Division
Designing low cost wind turbines having long fatigue lifetimes and low cyclic component and system loads is a major goal of the Federal Wind Energy Program and the wind industry. To achieve this goal, predictions derived from analytical models of complex and dynamically coupled systems are necessary. These models are necessary in order to capture the complex kinematic and dynamic couplings exhibited by the HAWT (Horizontal Axis Wind Turbine). In this paper interaction between the rotor and tower for a two-bladed teetering hub wind turbine are examined. Several turbine design parameters including a tip-brake mass, blade structural pretwist, tower shadow intensity, and system natural frequencies directly affect the predicted blade and system loads. Figure 1 for example shows the effects blade-tip-brake mass might have on predicted blade-root edgewise-bending moments for a particular two-bladed teetering hub turbine under study. The authors use the ADAMS (Automatic Dynamic Analysis of Mechanical Systems) software and the Oregon State University FAST (Fatigue, Aerodynamics, Structures, and Turbulence) codes to show these parameters on predicted rotor and system loads.
- OSTI ID:
- 93015
- Report Number(s):
- CONF-950116--; ISBN 0-7918-1294-4
- Country of Publication:
- United States
- Language:
- English
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