Title page for ETD etd-04182009-041114


Type of Document Master's Thesis
Author Hendricks, David Gerard
URN etd-04182009-041114
Title The experimental determination of rotor blade dynamic bending moments of a 10-kw wind turbine
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Moses, Hal L. Committee Chair
O'Brien, Walter F. Jr. Committee Member
Vaughan, David H. Committee Member
Keywords
  • Rotors
Date of Defense 1991-05-05
Availability restricted
Abstract

A l0-kW horizontal axis wind turbine was studied to determine the effects of wind shear and gravity on rotor blade bending moments.

A drag sphere based wind measuring system was designed to measure rapid fluctuations in wind velocity at two different heights. However, severe power line noise problems with the low level signals forced the use of standard rotating cup anemometry.

Rotor blade bending moments were obtained with strain gages mounted on blade extenders near the root of the instrumented blade. Rotor angular position data were obtained with a photocell arrangement.

The one per revolution primary bending moment frequency was caused mostly by gravity-induced bending. Also present is the 6 Hz blade natural frequency. A logarithmic atmospheric boundary layer (ABL) profile was used to estimate wind conditions at the upper level. Examination of the bending moment data revealed good agreement with values predicted from the ABL profile (within 4% in the mean) indicating the profile was a good mean approximation.

A logarithmic atmospheric boundary layer (ABL) profile was used to estimate wind conditions at the upper level. Examination of the bending moment data revealed good agreement with values predicted from the ABL profile (within 4% in the mean) indicating the profile was a good mean approximation.

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