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회전 효과를 고려한 Active Gurney Flap 의 동특성 해석
기영중,김태주,김덕관,Kee, YoungJung,Kim, TaeJoo,Kim, DeogKwan 대한기계학회 2015 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.3 No.3
본 논문에서는 헬리콥터 로터 시스템의 진동과 소음을 저감시키기 위해 개발이 진행 중인 능동거니플랩(AGF, Active Gurney Flap)에 대해 유한요소법을 이용하여 수행된 동특성 해석결과를 소개하였다. 거니플랩은 평판의 형태로 블레이드 하부 표면에 수직인 방향으로 전개되며, 블레이드 뒷전(T/E, Trailing Edge) 부위에 장착된다. 거니플랩 조립체는 전기모터와 L-형 링키지 및 플랩 등의 부품들로 구성되어 블레이드 내부에 장착되며, 고정프레임에서의 진동 성분들을 감소시키기 위해 3~5/rev 범위로 능동적인 제어가 필요하다. 따라서 외연적 시간적분법을 통해 로터 회전에 의한 원심력과 제어입력이 적용되고 있는 상황에서 거니플랩의 동적 응답특성을 분석하였으며, 해석 결과를 통해 거니플랩의 하향변위 요구도를 만족시킬 수 있음을 확인하였다. In this study, the finite element analysis was carried out to investigate dynamic characteristics of the AGF(Active Gurney Flap) which is under development for reducing vibration and noise of the helicopter rotor system. The Gurney flap is a kind of small flat plate, mounted normal to the lower surface of the airfoil near to the trailing edge. An electric motor, L-shaped linkages and flap parts were integrated into a rotor bade, and 3~5/rev control was given to the AGF to reduce the vibration in the fixed frame. Thus, an explicit time integration method was adopted to investigate the dynamic response of the AGF with considering both centrifugal force due to the rotor rotation and active control input, and it can be seen that the vertical displacement of the AGF was satisfied to meet the design requirement.
기영중(Kee YoungJung),김덕관(Kim DeogKwan) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
The manufacturing processes for fiber reinforced polymer (FRP) composite blades have provided rotorcraft designers with the freedom to incorporate advanced planforms and airfoil geometries to improve the aerodynamic performance or alleviate the vibratory load and noise. An accurate analysis of such structures requires the use of a sophisticated three-dimensional finite element analytical model. In this paper, an eighteen-node solid shell element is employed in the relevant formulation, and the incremental total Lagrangian approach is adopted to allow the treatment of geometrical nonlinearity. The effects of tip shapes on the free vibration of the composite blades are examined for different blade configurations including rectangular, swept, tapered, and swept tapered anhedral tips. It is found that the analytical model developed in the current approach will be effectively applicable for predicting the vibratory behavior of composite rotor blades with advanced tips.
헬리콥터 주로터 블레이드 동적밸런싱을 위한 마스터 블레이드 선정 및 활용
송근웅(KeunWoong Song),김덕관(DeogKwan Kim),김수연(SuYon Kim),송재림(JaeRim Song) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.10
Dynamic balancing of Composite blades must be done to be sure to minimize vibrations before installation on helicopter. Iinitial production blades of KUH(Surion) was carried out by shipset unit, but dynamic balancing using master blade is need to secure the interchangeability of each blade in order to decrease maintenance costs and times in the second production phase. In this paper, master blade selection process and its application for second production phase of KUH main rotor blade are described.
헬리콥터 로터 소음 저감을 위한 능동거니플랩의 동해석 및 회전시험 시뮬레이션
기영중(Kee YoungJung),임규백(Lim KyuBaek),김덕관(Kim DeogKwan) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Dynamic behavior of AGF(Active Gurney Flap) for BVI(Blade Vortex Interaction) noise reduction of a helicopter rotor system was investigated. In addition, in order to simulate the rotational test of the AGF, a model-scale rotor system was considered; which is 2-bladed hingeless rotor with 2.3m diameter and NACA23012 airfoil. The Gurney flap is a kind of small flat plate, mounted normal to the lower surface of the blade near to the trailing edge. An electric motor, L-shaped linkages and flap parts were integrated into a dummy blade. The AGF and rotor system was modeled using Midas-NFX; which is the commercial FEA code. The natural frequencies and mode shapes of a model-scale rotor system were calculated, then the dynamic displacement of the AGF with considering both the centrifugal force and active control input was investigated. The analysis results showed that the 4㎜ dynamic stroke requirement of the AGF