Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Development Test for Flexible PTO Shaft Made of Ti Alloy for Aircraft

Ti 합금을 이용한 항공기용 Flexible PTO 샤프트 개발 시험

  • Lee, Joo Hong (Reliability Assessment Center, Korea Institute of Machinery & Materials) ;
  • Kang, Bo Sik (Reliability Assessment Center, Korea Institute of Machinery & Materials) ;
  • Yu, Hyun Seok (Reliability Assessment Center, Korea Institute of Machinery & Materials) ;
  • Lee, Ji Man (Iones Co., Ltd.) ;
  • Cho, Hae Yong (Dept. of Mechanical Eng., Chungbuk Nat'l Univ.)
  • 이주홍 (한국기계연구원 신뢰성평가센터) ;
  • 강보식 (한국기계연구원 신뢰성평가센터) ;
  • 유현석 (한국기계연구원 신뢰성평가센터) ;
  • 이지만 (아이원스(주)) ;
  • 조해용 (충북대학교 기계공학부)
  • Received : 2016.04.15
  • Accepted : 2016.06.15
  • Published : 2016.08.01
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Abstract

The PTO (Power Take-Off) shaft for aircraft, with welded construction using multiple thin membranes, was developed in the 1950s to improve the elasticity of the part. As it is lightweight, stable at high speeds, and has good flexibility, it is used in most of the fighter aircraft. It connects the AMAD (aircraft mounted accessory drive) gearbox with the EMAD (engine mounted accessory drive) gearbox and transmits the rotational power between them. It operates in the high speed range of 10,000-18,000 rpm. In this study, the safety of the PTO shaft made of Ti alloy was investigated using finite element analysis, and the ability to transmit power was demonstrated through a high-cycle fatigue test conducted in a laboratory. Further, the life of the ball joints of the aircraft under high-cycle fatigue test conditions was predicted, and the wear characteristics were analyzed.

항공기 등에 사용되는 Flexible PTO(Power Take-Off) 샤프트는 스프링 특성을 좋게 하기 위해 여러장의 얇은 멤브레인을 용접한 형태로 1950년대에 이미 개발됐으며, AMAD(Aircraft Mounted Accessory Drive) 기어박스와 EMAD(Engine Mounted Accessary Drive) 기어박스 사이에서 회전동력을 전달한다. 이런 종류의 샤프트는 가볍고 특히 스프링 특성이 좋기 때문에 축 정렬이 틀어진 고속회전 상태에서도 안정적으로 회전동력을 전달할 수 있어 대부분의 전투기에 사용된다. 이번 연구에서 티타늄 합금으로 개발된 Flexible PTO 샤프트의 구조해석을 통해 제품의 안전성을 확인하였고, 실제 실험실에서 진행된 고속회전 시험에서 굽힘과 비틀림 부하를 동시에 인가하여 샤프트의 고주기 피로에 대한 내성을 실증하였다. 또한, 고주기 피로 시험 조건에서 항공기용 볼 조인트의 마모 특성 분석을 통해 수명을 예측하였다.

Keywords

References

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