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Author White, Darris.

Title Evaluation of the new B-REX fatigue testing system for multi-megawatt wind turbine blades [electronic resource] : preprint / D. White, W. Musial, and S. Engberg.

Imprint Golden, Colo. : National Renewable Energy Laboratory, [2005]

Copies

Location Call No. OPAC Message Status
 Axe Federal Documents Online  E 9.17:NREL/CP-500-37075    ---  Available
Description 14 p. : digital, PDF file.
Series Conference paper ; NREL/CP-500-37075
System Details Mode of access: Internet from the NREL web site.
Note Title from title screen (viewed on June 8, 2006).
"December 2004."
Summary The National Renewable Energy Laboratory (NREL) recently developed a new hybrid fatigue testing system called the Blade Resonance Excitation (B-REX) test system. The new system uses 65% less energy to test large wind turbine blades in half the time of NREL's dual-axis forced-displacement test method with lower equipment and operating costs. The B-REX is a dual-axis test system that combines resonance excitation with forced hydraulic loading to reduce the total test time required while representing the operating strains on the critical inboard blade stations more accurately than a single-axis test system. The analysis and testing required to fully implement the B-REX was significant. To control unanticipated blade motion and vibrations caused by dynamic coupling between the flap, lead-lag, and torsional directions, we needed to incorporate additional test hardware and control software. We evaluated the B-REX test system under stable operating conditions using a combination of various sensors. We then compared our results with results from the same blade, tested previously using NREL's dual-axis forced-displacement test method. Experimental results indicate that strain levels produced by the B-REX system accurately replicated the forced-displacement method. This paper describes the challenges we encountered while developing the new blade fatigue test system and the experimental results that validate its accuracy.
Subject Fatigue testing machines -- Evaluation.
Wind turbines -- Testing.
Turbines -- Blades -- Testing.
Indexed Term 14 SOLAR ENERGY
17 WIND ENERGY
ACCURACY
EVALUATION
EXCITATION
HYDRAULICS
NATIONAL RENEWABLE ENERGY LABORATORY
OPERATING COST
RESONANCE
STRAINS
TESTING
WIND TURBINES
Added Author Musial, Walter D.
Engberg, Scott.
National Renewable Energy Laboratory (U.S.)
White, D.
Musial, W.
Engberg, S.
Other Form: White, Darris. Evaluation of the new B-REX fatigue testing system for multi-megawatt wind turbine blades 14 p. (OCoLC)58726010
Standard No. DOX 15015118
Gpo Item No. 0430-P-04 (online)
Sudoc No. E 9.17:NREL/CP-500-37075

 
    
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