대형 풍력발전기용 복합재 블레이드의 후단 및 스파-웹 부위 디본딩 손상에 따른 고유주파수 특성 평가
Evaluation for of the Natural Frequency according to the Debonding Damage at the Trailing Edge and Spar-Web Joint of Large-scale Wind Turbine Composite Blade
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The wind turbine blades is are becoming larger due tobecause of its their energy efficiency, resulting in serious weight increasing problem. and toTo solve this, the blades areis manufactured using the composite materials with high specific strength and stiffness. HoweverOn 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 the structural integrity of the blade in operation, the data build-up that can be used to detect these this damage is necessary. Therefore, this paper investigated 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 through by modifying the contact conditions. T and 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.
Abstract
The wind turbine blades is are becoming larger due tobecause of its their energy efficiency, resulting in serious weight increasing problem. and toTo solve this, the blades areis manufactured using the composite materials with high specific strength and stiffness. HoweverOn 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 the structural integrity of the blade in operation, the data build-up that can be used to detect these this damage is necessary. Therefore, this paper investigated 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 through by modifying the contact conditions. T and 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.
참고문헌 (20)
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