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피치계 탄소섬유를 적용한 풍력발전기용 복합재 블레이드의 구조 안전성 평가
현영빈(Hyun-Young Bin),김학근(Hak-Geun Kim),전병욱(Byung-Wook Jeon),곽성종(Sung-Jong Kwak),강기원(Ki-Weon Kang) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
최근 신재생에너지 발전량 확대에 따라 풍력발전기 효율을 극대화하고 있다. 이를 위해 주요 부품인 복합재 블레이드에 대한 설계 및 생산이 이루어지고 있다. 이러한 복합재 블레이드는 비강성, 비강도를 확보하기 위해 주로 Pan 계 탄소섬유를 적용하고 있다. 이는 발전단가 경쟁력이 취약할 수 있다. 이러한 발전 단가를 확보하기 위해서 Pan 계 탄소섬유보다 비강성이 높고, 유리섬유보다 비강도가 높은 저렴한 Pitch 계 탄소섬유 블레이드 설계 기준이 필요하다. 본 논문에서는 군산대학교가 자체 개발한 고유익형을 기반으로 한 KA-2 20kW 급 Pitch 계 블레이드 구조 안전성 평가를 위해서 구조 해석 및 구조 시험을 수행하였다. 이를 위한 하중 산출은 IEC61400-2 규정의 단순하중산출기법(simplified load calculation method)을 사용하였다. 블레이드의 구조 설계를 위해 좌굴 해석, 정적 해석, 모달 해석을 수행하여 구조안전성을 평가하였다. 이의 해석 검증을 위해 구조 시험을 진행하였으며 최대 설계하중조건에 대해 블레이드의 안전성 확보와 파손 특성을 평가하였다 The efficiency of wind turbines is being maximized according to the recent expansion of renewable energy generation. for this purpose the design and production of composite blades, which are major components being conducted. These composite blades mainly apply Pan-based carbon fiber to secure Specific Stiffness and Specific strength. This can weaken the competitiveness of the unit price of power generation. In order to secure these power generation unit prices, it is necessary to have blade design standards for Pitch-based carbon fiber blade which is more Specific Stiffness than Pan-based carbon fiber and has a more Specific strength than glass fiber. In this paper, structural analysis and structural tests were conducted to evaluate the structural safety of the KA-2 20kW class Pitch blade based on the original airfoil developed by kunsan national university. For the load calculation used the simplified load calculation method specified in IEC61400-2. Buckling analysis, static analysis, and modal analysis were performed for the structural design of the blade to evaluate the structural stability. A structural test was conducted to verify its analysis, and the stability and Breakage characteristics of the blade regarding for the maximum design load case.
Puck 이론 기반 Type 4 비정형 수소압력용기의 점진적 파손해석
전병욱(Byung-Wook Jeon),현영빈(Young-Bin Hyun),최찬웅(Choi-Woong Choi),강기원(Ki-Weon Kang) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In this paper, Analysis of Progressive Failure of Type 4 Atypical Conformal Hydrogen Storage Vessel based on the Puck Theory was performed. To this end, first, finite element modeling was performed on a 70 MPa atypical conformal hydrogen pressure vessel having a Type 4 shape, and stacking design was performed using ABAQUS to consider the stacking method. In addition, a boundary condition was applied to the part where the boss was joined, and a load was applied until the atypical hydrogen pressure vessel ruptured. Through this, structural safety evaluation was performed, and the location of the initial failure was derived based on the failure criterion Puck theory. In addition, the failure tendency was analyzed by performing a gradual failure analysis in which the damage increases afterwards.