The NREL teetering hub rotor code: Final results and conclusions
Accurately predicting wind turbine blade loads and response is important for the proper design of wind turbines. The need to accurately predict both deterministic and stochastic blade loads is now widely recognized. Previous rotor code development and validation efforts at NREL have concentrated on prediction of deterministic and stochastic blade loads for rigid hub rotors. During the past year this effort was expanded for predicting blade and shaft loads for two-bladed teetering hub rotors. The NREL (formerly SERI) Teetering Rotor Analysis Program (STRAP), a derivative of the Force and Loads Analysis Program (FLAP), can include the effects of rotor undersling, delta-3 and the effects of a concentrated hub mass. The degrees of freedom include rotor teeter and symmetric and asymmetric rotor flap modes. A time-dependent, prescribed yaw motion can also be input to the code. Loads due to turbulent wind inputs are also calculated. In this paper, final code modifications, final comparisons of load predictions to test data, and finally, the direction for new code development activities at NREL will be described. 12 refs.
- Research Organization:
- National Renewable Energy Lab., Golden, CO (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC02-83CH10093
- OSTI ID:
- 5987602
- Report Number(s):
- NREL/TP-257-4517; CONF-920122-4; ON: DE92001187
- Resource Relation:
- Conference: American Society of Mechanical Engineers (ASME) energy sources technology conference and exhibition, Houston, TX (United States), 26-30 Jan 1992
- Country of Publication:
- United States
- Language:
- English
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