• 제목/요약/키워드: Helicopter noise

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공력 Buffet 하증을 고려한 헬리콥터 탐색등의 구조진동해석 (Structural Vibration Analysis of Helicopter Search Light Considering Aerodynamic Buffet Load)

  • 김요한;김동만;김동현;최희주;박용석;김종건
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2008년도 추계학술대회논문집
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    • pp.175-179
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    • 2008

  • In this study, computational structural vibration analysis of helicopter search light exposing unsteady buffet load have been conducted using combined advanced numerical methods. Unsteady CFD method based on Navier-Stokes equations is used to predict viscous buffet load due to flow separation effects. Full three-dimensional finite element model is constructed in order to conduct static and structural dynamic analyses of the search light model for two different typical flight speeds. Also, the correct performance of the search light can be physically estimated to examine the actual lighting area considering the effects of structural deformations.

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무베어링 헬리콥터 주 로터의 허브 파라미터 변화에 따른 로터 안정성 특성 해석 (Hub Parametric Investigation of Main Rotor Stability of Bearingless Helicopter)

  • 윤철용;기영중;김태주;김덕관;김승호
    • 한국소음진동공학회논문집
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    • 제22권8호
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    • pp.784-790
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    • 2012

  • This paper describes a stability and dynamic characteristics of bearingless helicopter main rotor in hover. Baseline rotor configuration is defined and modal analysis for the configuration is taken to verify the dynamic characteristics. The kinematic pitch-lag couplings through ways of pitch link installation are analyzed to know effects on loads, frequencies and stability. The effects of pitch link attachments in spanwise direction and chordwise direction as well as pitch link inclination on thrust, power, flpa-lag-pitch mode frequencies and inplane damping are examined. Pitch link at trailing edge location in chordwise direction has influence on aeroelastic stability of the rotor. Also, the pitch link with negative inclination angle makes inplane damping increase.

  • https://doi.org/10.5050/KSNVE.2012.22.8.784 인용 PDF KSCI