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금속재와 복합재 허브 Flexure를 갖는 무힌지 허브시스템의 공력탄성학적 안정성에 관한 실험적 연구
송근웅(Keun-Woong Song),김준호(Joune-Ho Kim),김덕관(Deog-Kwan Kim),이욱(Wook Rhee) 한국항공우주학회 2005 韓國航空宇宙學會誌 Vol.33 No.2
본 논문은 복합재 패들형 블레이드를 장착한 무힌지 허브 시스템의 정지 및 전진 비행시 공력탄성학적 안정성 시험에 대한 것이다. 블레이드와 허브 flexure의 리드래그 감쇠비를 측정하기 위해 무힌지 허브시스템을 한국항공우주연구원의 GSRTS(General Small-scaled Rotor Test System)에 장착하여 가진 시험을 실시하였다. 리드래그 모드의 감쇠비를 산출하기 위해 MBA(Moving Block Analysis)기법을 사용하였다. 먼저 금속재 flexure를 장착하여 시험을 수행한 후, 로터시스템의 동력학적 특성이 같도록 설계된 복합재 flexure를 장착하여 시험하였다. 시험은 정지 및 전진비행 조건에 따라 지상 및 풍동에서 수행하였다. 비회전 시험을 통해 복합재 flexure의 감쇠특성이 금속재보다 향상됨을 확인하였으며, 모든 시험 조건에 대해 복합재 flexure가 금속재보다 무힌지 허브시스템에 대한 공력탄성학적 안정성이 향상됨을 확인하였다. This paper presents the result of the aeroelastic stability test of the small-scaled hingeless hub system with composite paddle blades in hover and forward flight conditions. Excitation tests of hingeless hub system installed in GSRTS(General Small-scale Rotor Test System) at KARI(Korea Aerospace Research Institute) were carried out to get lead-lag damping ratio of blades with flexures as hub flexure. MBA (Moving Block Analysis) technique was used for the estimation of lead-lag damping ratio. First, blades with metal flexures, then with composite flexures of the same dynamic properties of rotor system as metal one were tested. Tests were done on the ground and in the wind tunnel according to the test conditions of hover and forward flight, respectively. Composite flexures were found to have better damping characteristics over metal ones in the non-rotating vibration test, and it was confirmed that the use of composite flexures would give observable improvement in aeroelastic stability compared to metal ones in all test conditions.
균등 및 비균등 배열 헬리콥터 반토오크 시스템 성능 및 소음특성
송근웅(Song, Keun-Woong),정기훈(Chung, Ki-Hoon),강희정(Kang, Hee-Jung),김승범(Kim, Seung-Bum),이제동(Lee, Je-Dong) 한국소음진동공학회 2006 한국소음진동공학회 논문집 Vol.16 No.8
This paper described the performance test and sound characteristics of helicopter 'Tail-Fan' anti-torque system. In this research, Korea Aerospace Research Institute(KARI) developed 'Tail-Fan' anti-torque system for a helicopter and carried out performance and sound capturing tests of even and uneven tail fans. The performance test is carried out and the noise signals which are generated during the test are saved with microphones at the same time. The performance test's results meet the design requirements. Tone-corrected perceived noise level is reduced by replacing the even product with the uneven one.
송근웅(Song Keun Woong),이재하(Lee Jae Ha),김승호(Kim Seoung Ho) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.10
Small-scaled Rotor Test facility(GSRTS, General Small-scaled Rotor Test Facility) in KARI could not use the test because facility aging and parts discontinued. Also in order to perform a joint international research, GSRTS modifications should be needed. So requirements of GSRTS modifications were established and according to the requirements, GSRTS modifications were conducted. Facility operation test, 6-component fixed balance calibration, Small-scaled OLS rotor performance test were performed to verify the results of GSRTS modifications. Reasonable results were obtained in comparison to calculation results. Then GSRTS ready was completed to conduct international collaborative research and wind tunnel test.
차세대 블레이드(NRSB-1M/2M)의 마하 스케일 성능시험
송근웅(Keun-Woong Song),김준호(Joune-Ho Kim),김승호(Seung-Ho Kim) 한국항공우주연구원 2006 항공우주기술 Vol.5 No.2
본 논문에서는 차세대 블레이드인 NRSB-1M과 NRSB-2M의 성능시험 절차 및 결과에 대해 기술하였다. 축소 블레이드 성능시험으로 공력 성능 시험과 소음 시험을 수행하였다. 공력 성능시험은 회전발란스를 이용하여 로터 추력 및 토오크를 측정하였고, 소음 측정시험은 마이크로폰을 이용하여 1.64D 위치에서 소음을 측정하였다. 측정된 성능 데이터는 무차원화하여 분석하였고, 두 블레이드 결과를 서로 비교하여 NRSB-2 블레이드가 더 좋은 블레이드 임을 확인하였다. This paper describes the performance test procedures and results of NRSB-1M and NRSB-2M. Not only aerodynamic performance test but also sound measurement test were performed for the small-scaled blades in the ground. Total thrusts and torques of the rotor were measured using rotating balance for aerodynamic performance test. Sound pressure levels were measured using microphone in 1.640 distance for sound measurement test. Non-dimensionalized test data are compared and analyzed Consequently, It was confirmed that NRSB-2 was better than NRSB-1.