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위상배열 초음파탐상기술을 이용한 풍력 복합소재 블레이드의 박리 부위 검출
지수정(Su Chung Chi),조범진(Bum Jin Cho),남문호(Mun Ho Nam),임선(Sun Lim) 한국비파괴검사학회 2017 한국비파괴검사학회지 Vol.37 No.3
풍력발전기의 복합소재 블레이드는 풍력발전 시스템 전체에 중요한 구성요소 임에도 불구하고 제작과정 중 블레이드의 신뢰성을 평가할 수 있는 적절한 비파괴검사 시스템이 구축되지 않았다. 블레이드의 결함에 의해 사고가 발생하게 되는 경우에는 상당한 손해가 예상되기 때문에 블레이드의 안정성 강화를 위하여 블레이드의 제작 중 검사가 필수적이라고 할 수 있다. 본 연구에서는 이러한 복합소재 블레이드의 접합부 검사를 위하여 검사 데이터 저장성과 검사 진행 속도가 뛰어난 위상배열 초음파검사법을 이용하여 블레이드 접합부에서 주로 발생하는 박리의 검출 가능성 유무를 확인하였다. Although blades are one of the most important parts of a wind generation system, there is no established inspection system to assess the soundness of a composite wind blade during the fabrication stage. In the case of an accident caused by a defect on the blade, the possible damage could be more than expected; therefore, it is necessary to evaluate blades during production. In this study, it was verified that the phased array ultrasonic testing, employing inspection of stored data and high inspection speed, is an effective technique to reveal delamination in the bonds of composite wind blades.
위상배열 탐상검사법을 이용한 풍력발전용 블레이드의 일정가압 메커니즘 신뢰성 평가
남문호(Mun Ho Nam),지수정(Su Chung Chi),임선(Sun Lim),임승환(Seung Hwan Lim),정예찬(Ye Chan Jeong) 한국신뢰성학회 2017 신뢰성응용연구 Vol.17 No.3
Purpose: There is no established inspection system for composite wind blade during the fabrication stage even though the blades are one of the most important part at wind generation system, but phased array ultrasonic testing method has been continuously studied about wind turbine blade with composite. When wind turbine blade with complex shape by phased array probe is inspected, it is necessary to study for system keeping constant pressure using pressure device. Methods: In this paper, we propose constant pressure device for inspecting wind turbine blade by phased array ultrasonic test method. Design of the device controller is based on Hunt-Crossley model. We evaluate reliability of phased array ultrasonic inspection result that applicated constant pressure device. Result: Defect indication is precise and its error is small when constant pressure mechanism based on Hunt-Crossley model was used. Conclusion: When inspection is progressed using constant pressure mechanism, the reliability of composite wind blade inspection can be improved.
풍력 발전용 블레이드 접합부의 결함 검출을 위한 일정가압 메커니즘 설계 및 실험
임선(Sun Lim),임승환(Seung Hwan Lim),정예찬(Ye Chan Jeong),지수정(Su Chung Chi),남문호(Mun Ho Nam) 한국신뢰성학회 2017 신뢰성응용연구 Vol.17 No.3
Purpose: Reliability is the most important factor to detect defects as wind turbines are deployed in large blades. The methods of detecting defects are various, such as non-destructive inspection and thermal imaging inspection. We propose the phased array ultrasonic testing method of non-destructive testing. Methods: We propose the active pressure mechanism for wind power blade. The phase array ultrasonic inspection method is used for fault detection inner blade surface. Controlled pressure of mechanism with respect to z-axis is important for guarantee the result of phase array ultrasonic inspection. The model based control and proposed mechanism are utilized for overall system stability and effectiveness of system. Result: The result of proposed pressure mechanism B is more stable than A. Convergence speed is also faster than A. Conclusion: We confirmed the performance of the proposed constant pressure mechanism through experiments. Non-destructive testing was applied to the specimen to confirm the reliability of detecting defects.