회전익항공기 진동저감장치 장착부 구조 개선 연구 = Improvement Study of Helicopter Vibration Reduction Device Support Structure

다국어 초록 (Multilingual Abstract)

Cracks have been detected on the left and right floor shelves of the center fuselage during periodic rotorcraft inspections, and temporary inspections have shown that they are only detected in rotorcraft equipped with an active vibration-damping device. In this study, we analyzed the causes of these cracks and devised a means of detecting and reducing their frequencies. Fracture surface analysis, stress analysis, and instrument flight tests were performed to determine the causes of these cracks. Fracture surface stresses were calculated using strain data to evaluate floor shelf life. In addition, we propose a means of improving the design of the floor shelf to prevent crack formation. Structural integrity of the modification was verified by stress analysis and performing instrumentation flight tests. Aircraft operation rates were increased by implementing the design improvement. Furthermore, we expect that the study could be used as a reference for future studies on cracks attributed to similar causes.

참고문헌 (Reference)

1 김도형 ; 김태주 ; 백승길 ; 곽동일 ; 정세운, "헬리콥터 능동진동제어시스템의 수리온 적용 및 성능 분석" 한국항공우주학회 43 (43): 557-567, 2015

2 정세운 ; 곽동일 ; 김세희 ; 최종호 ; 심대성, "한국형기동헬기 진동저감장치" 한국항공우주학회 41 (41): 987-993, 2013

3 김남조 ; 곽동일 ; 강우람 ; 황유상 ; 김도형 ; 김찬동 ; 이기진 ; 소희섭, "소형민수헬기 능동진동제어시스템 개발" 한국항공우주학회 50 (50): 181-192, 2022

4 이예린 ; 김도영 ; 김도형 ; 홍성부 ; 박재상, "능동 진동 제어 시스템을 이용한 UH-60A 헬리콥터 기체의 진동 감소 시뮬레이션" 한국항공우주학회 48 (48): 443-453, 2020

5 U.S. Department of Defense, "MIL-HDBK-5J"

6 Loewy, "Helicopter Vibrations : A Technological Perspective" 29 (29): 4-30, 1984

7 Reichert, G., "Helicopter Vibration Control a Survey" 5 (5): 1-20, 1981