TY  - BOOK
ED  - National Aeronautics and Space Administration
ED  - Energy Research and Development Administration
TI  - Vibration characteristics of a large wind turbine tower on non-rigid foundations / 
T2  - ERDA/NASA
PY  - 1977///
CY  - Cleveland : 
PB  - National Aeronautics and Space Administration, 
KW  - ENERGIA EOLICA
KW  - TURBINAS EOLICAS
KW  - PRODUCCION DE ENERGIA
KW  - CONVERSION DE ENERGIA
KW  - VIBRACIONES
KW  - CIMIENTOS NO RIGIDOS
N1  - Informe/número de patente ERDA/NASA-1004/77/1; NASA TM X-73670; Vibration characteristics of the Mod-OA wind turbine supported by nonrigid foundations were investigated for a range of soil rigidities. The study shows that the influence of foundation rotation on the fundamental frequency of the wind turbine is quite significant for cohesive soils or loose sand. The reduction in natural frequency can be greater than 20 percent. However, for a foundation resting on well graded, dense granular materials or bedrock, such effect is small and the foundation can be treated as a fixed base
UR  - https://ntrs.nasa.gov/citations/19770019669
ER  -