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[학술저널]

대형 풍력발전기용 복합재 블레이드의 후단 및 스파-웹 부위 디본딩 손상에 따른 고유주파수 특성 평가

  • 학술저널

대형 풍력발전기용 복합재 블레이드의 후단 및 스파-웹 부위 디본딩 손상에 따른 고유주파수 특성 평가

Evaluation of the Natural Frequency according to the Debonding Damage at the Trailing Edge and Spar-Web Joint of Large-scale Wind Turbine Composite Blade

김학근(Kunsan National University) 장윤정(Kunsan National University) 김배성(Kunsan National University) 강기원(Kunsan National University)

DOI : 10.7849/ksnre.2019.3.15.1.018

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초록

The wind turbine blades are becoming larger because of their energy efficiency, resulting in serious weight increasing problem. To solve this, the blades are manufactured using the composite materials with high specific strength and stiffness. On the other hand, damage modes, such as delamination, cracking, and de-bonding may occur inside depending on the constituents, fabrication process and operating conditions of the composite blades. Therefore, to ensure structural integrity of the blade in operation, the data build-up that can be used to detect this damage is necessary. Therefore, this paper examined the changes in the blade natural frequency characteristics resulting from debonding damage of the trailing edge and the spar-web joints. To this end, the FE model for the 5MW wind turbine blade was generated using geometry, layup information and material properties reported by SANDIA Lab. In addition, the debonding damage that exists at the rear end and on the spar-web joint was modeled by modifying the contact conditions. The modal analysis was performed according to the debonding damage length. Through these, the natural frequency change characteristics according to the size and location of the damage were evaluated.

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ABSTRACT
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4. 결론
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