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Title: Structural Testing of 9 m Carbon Fiber Wind Turbine Research Blades: Preprint

Abstract

This paper outlines the results of tests conducted on three 9-m carbon fiber wind turbine blades designed through a research program initiated by Sandia National Laboratories.

Authors:
; ;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
898138
Report Number(s):
NREL/CP-500-40985
TRN: US200705%%599
DOE Contract Number:
AC36-99-GO10337
Resource Type:
Conference
Resource Relation:
Conference: To be presented at the AIAA 2007 Wind Energy Symposium, 8-11 January 2007, Reno, Nevada
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; CARBON FIBERS; RESEARCH PROGRAMS; SANDIA NATIONAL LABORATORIES; TESTING; WIND TURBINES; TURBINE BLADES; WIND ENERGY; WIND TURBINE BLADES; AIRFOILS; CARBON FIBER; TWIST-BEND COUPLING; Wind Energy

Citation Formats

Paquette, J., van Dam, J., and Hughes, S.. Structural Testing of 9 m Carbon Fiber Wind Turbine Research Blades: Preprint. United States: N. p., 2007. Web.
Paquette, J., van Dam, J., & Hughes, S.. Structural Testing of 9 m Carbon Fiber Wind Turbine Research Blades: Preprint. United States.
Paquette, J., van Dam, J., and Hughes, S.. Mon . "Structural Testing of 9 m Carbon Fiber Wind Turbine Research Blades: Preprint". United States. doi:. https://www.osti.gov/servlets/purl/898138.
@article{osti_898138,
title = {Structural Testing of 9 m Carbon Fiber Wind Turbine Research Blades: Preprint},
author = {Paquette, J. and van Dam, J. and Hughes, S.},
abstractNote = {This paper outlines the results of tests conducted on three 9-m carbon fiber wind turbine blades designed through a research program initiated by Sandia National Laboratories.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

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  • Abstract not provided.
  • Fatigue testing was conducted on Carbon Experimental and Twist-Bend Experimental (CX-100 and TX-100) 9-m wind turbine research blades. The CX-100 blade was designed to investigate the use of a carbon spar cap to reduce weight and increase stiffness while being incorporated using conventional manufacturing techniques. The TX-100 blade used carbon in the outboard portion of the skin to produce twist-bend coupling to passively alleviate aerodynamic loads. In the fatigue tests, the CX-100 blade was loaded by a single hydraulic cylinder while the TX-100 blade was loaded via a hydraulically-actuated resonant loading system called the Universal Resonant Exciter. The blades weremore » outfitted with approximately 30 strain gages as well as displacement and load sensors. Both blades survived to cycle counts sufficient to demonstrate a 20-year operational life. The CX-100 blade failed at approximately 1.6 million cycles because of a buckle and crack that formed and grew just outboard of max-chord. The TX-100 blade failed because of a crack that grew from the termination point of the spar cap at the midspan of the blade. This paper covers the results of the fatigue tests.« less
  • Abstract not provided.
  • Abstract not provided.
  • 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 themore » 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.« less