Proof of Concept Test for Dual-Axis Resonant Phase-Locked Excitation (PhLEX) Fatigue Testing Method for Wind Turbine Blades
| العنوان: | Proof of Concept Test for Dual-Axis Resonant Phase-Locked Excitation (PhLEX) Fatigue Testing Method for Wind Turbine Blades |
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| المؤلفون: | Beckwith, Jenna Austin |
| تفاصيل مُضافة: | White, Darris, advisor Embry-Riddle Aeronautical University. Department of Mechanical Engineering. Beckwith, Jenna Austin |
| Call Numbers: | TJ828 .B43 2014eb |
| وصف مادي: | 1 online resource (99, 18 leaves) : illustrations (chiefly color) |
| مستخلص: | he installed capacity of wind turbines has grown steadily for the past decade with wind energy now providing 3.6-percent of the U.S.’s electricity supply [13]. This trend can be attributed to advancements in wind turbine technology and the ability to increase wind turbine sizes. As wind turbines grow in size, so do the loads experienced by the turbine. One of the most significant load increases is in the lead-lag direction of the wind turbine blades. The increase in lead-lag load is due to the increase in weight of the larger blades. Current wind turbine blades have lead-lag and flapwise loads on the same order of magnitude. The blades of wind turbines are critical components, and full-scale blade fatigue testing is a necessary step to validate blade designs. A collaborative effort between the National Renewable Energy Laboratory (NREL) and Embry-Riddle Aeronautical University (ERAU) has resulted in the development of the dual-axis resonant Phase-Locked Excitation (PhLEX) fatigue test method. The PhLEX method fatigues wind turbine blades by loading both flapwise and lead-lag directions simultaneously at the leadlag fundamental frequency while controlling the phase between the directional loadings. The PhLEX method offers a load distribution that accurately resembles field operation loads while decreasing test duration. A proof-of-concept test of the PhLEX method was conducted at the National Wind Technology Center (NWTC) in July of 2012. It was found that a dual-axis resonant test running at the lead-lag fundamental frequency could be run in a controlled manner, with both the lead-lag and flapwise directions demonstrating first mode deflections. The PhLEX proof-of-concept test set-up and the results and conclusions of the proof-of-concept test are presented in this thesis. |
| الموضوعات: | Wind turbines Testing., Turbines Blades Testing., Fatigue testing machines., Matériaux Fatigue Machines d'essai., Fatigue testing machines, Turbines Blades Testing |
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| الإتاحة: | Open access content. Open access content |
| ملاحظة: | Also available in print. "Daytona Beach, FL, December 3, 2014." Includes bibliographical references (leaves 76-82). pt. I. Introduction to wind turbines. Historical review of wind machines ; Modern wind industry. Industry growth - Cost of energy - Cost of investment - The modern wind turbine ; Wind turbine blade properties. Blade nomenclature - Blade geometry - Materials and manufacture of blades ; Wind turbine blade loads. Aerodynamic loads - Inertial loads - Load phase angle -- pt. II. Fatigue testing of wind turbine blades. Full - scale blade testing. Static testing - Fatigue testing - The effect of the load phase angle of fatigue testing ; Current dual - axis fatigue test methods. Forced displacement - Resonant testing - Resonant and forced displacement testing - Quantum resonant testing ; PhLEX test method ; PhLEX development. Phase I - Phase II - Phase III ; PhLEX model predictions. Power requirements of PhLEX actuator - Test duration ; Scope of thesis -- pt. III. Proof - of - concept test. Test scope ; Test article ; Test set - up. Facility configuration - Blade orientation - Load introduction - Instrumentation of blade ; Control strategy -- pt. IV. Test performed during proof - of - concept test. Feedback signal disturbance ; Overview of tests. Control diagram - Dual compensation control - Force control and displacement control -- pt. V. Proof - of - concept test data post - processing results. Signal disturbance filter ; Dual - axis PhLEX test. PhLEX applied moments - PhLEX phase angle ; Quantum resonance test. Quantum resonance applied moments - Quantum resonance phase angle -- pt. VI. Discussion of results. Applied moments ; Phase angle -- pt. VII. Conclusions -- pt. VIII. Future work -- Appendix A. Individual tests performed during proof - of - concept -- Appendix B. MATLAB scripts. Main script ; PlotFFT function ; Butterworth filter ; Peak / valley detection ; Curve fit polynomial to data ; Integrate acceleration to deflection -- Appendix C. Test plan. |
| أرقام أخرى: | FER oai:commons.erau.edu:edt-1261 1014343166 |
| المصدر المساهم: | From OAIster®, provided by the OCLC Cooperative. |
| رقم الأكسشن: | edsoai.on1014343166 |
| قاعدة البيانات: | OAIster |
| الوصف غير متاح. |