• 한국소음진동공학회논문집
• /
• 제19권9호
• /
• pp.870-875
• /
• 2009

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.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2008년도 추계학술대회논문집
• /
• pp.175-179
• /
• 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.

• 한국항공우주학회지
• /
• 제49권6호
• /
• pp.457-464
• /
• 2021

위성발사체에 심각한 진동하중을 발생시키는 버펫 현상을 해석하기 위하여, CFD 해석과 반경험식을 결합하여 천음속 영역 해머헤드 발사체에서 발생할 수 있는 압력섭동을 예측하였다. RANS 해석을 수행하여 충격파 진동 영역, 박리영역, 박리 재부착 지점 등을 확인하였으며, 경계층 두께, 배제 두께, 경계층 끝단에서의 유동 정보를 계산하였다. RANS 결과와 공간 분포를 고려한 반경험식을 결합하여 해머헤드 페어링 주위의 압력 섭동과 파워스펙트럼을 예측하였고 시험 결과와 비교하였다.