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동적하중을 받는 항공기 외부장착물의 피로수명 예측에 대한 연구
정회인(Hoein Jeong),박지환(Jihwan Park),손동훈(Donghun Son),장종윤(Jongyoun Jang) 한국소음진동공학회 2019 한국소음진동공학회 논문집 Vol.29 No.4
In this article, we evaluate the fatigue life of an aircraft external store under real dynamic loads of a helicopter. For estimation of fatigue life of an aircraft external store, we first measured the vibration after mounting an aircraft external store on the actual helicopter and analyzed the PSD. Then, the PSD for accelerated life test was calculated using VRS and time scaling. The natural frequency obtained from the ODS test was compared with the natural frequency of the FEM analysis. Moreover, the response PSD of the ODS test and the response PSD of the FEM analysis were compared. The stress cycle through the SN curve of the material was analyzed. The cumulative damage factor was analyzed via Miner’s rule. Finally, the fatigue life was predicted.