The NREL teetering hub rotor code: Final results and conclusions

Conference · Sat Nov 30 23:00:00 EST 1991

OSTI ID:5987602

Wright, A D; Butterfield, C P

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: DOE; 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
• Country of Publication: United States
• Language: English

Related Subjects

17 WIND ENERGY
170602* -- Wind Energy Engineering-- Turbine Design & Operation
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
COMPUTER CODES
COMPUTERIZED SIMULATION
DYNAMIC LOADS
EQUIPMENT
FLUID FLOW
FUNCTIONS
MACHINERY
POWER GENERATION
ROTORS
S CODES
SIMULATION
SPECTRAL DENSITY
SPECTRAL FUNCTIONS
TURBINES
TURBOMACHINERY
TURBULENT FLOW
WIND LOADS
WIND TURBINES