Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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Control of torsional vibration for propulsion shafting with delayed engine acceleration by optimum design of a viscous-spring damper

점성-스프링 댐퍼 최적화 설계를 이용한 엔진 증속지연 특성을 갖는 추진축계 비틀림진동 제어

  • Kim, Yang-Gon (Korea Register of Shipping) ;
  • Hwang, Sang-Jae (STX Heavy Industries Co., Ltd.) ;
  • Kim, Young-Hwan (Graduate School of Refrigeration and Air-Conditioning Engineering, Korea Maritime and Ocean University) ;
  • Kim, Sang-Won (ATS Co., Ltd.) ;
  • Cho, Kwon-Hae (Department of Offshore Plant Management, Korea Maritime and Ocean University) ;
  • Kim, Ue-Kan (Division of Mechanical Engineering, Korea Maritime and Ocean University)
  • Received : 2016.05.04
  • Accepted : 2016.08.10
  • Published : 2016.09.30
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Abstract

The ultra-long stroke engine was developed to generate greater power at lower speeds than previous designs to enhance the propulsion efficiency. The torsional exciting force, on the other hand, was increased significantly. Therefore, it is possible to control the torsional vibration of its shaft system equipped with the fuel efficient ultra-long stroke engine by adopting a damper although the torsional vibration could be controlled adequately by applying tuning and turning wheels on the engine previously. In this paper, the dynamic characteristics of a viscous-spring damper used to control the torsional vibration of the corresponding shaft system are reviewed and then examined to determine what vibration characteristics might be used to optimize the viscous-spring damper. In some cases, operators of eco-ships have recently experienced the problem of delayed RPM acceleration. It has been suggested that the proper measures for controlling the torsional vibration in the shaft system should involve adjusting the design parameters of its damper determined by the optimum damper design theory to avoid the fatigue damage of shafts.

추진효율 향상을 위해 개발된 초장행정 엔진은 저속에서도 큰 출력을 낼 수 있는 장점이 있는 반면에 이전에 비해 비틀림진동의 기진력은 상당히 증가하였다. 따라서 이전에는 튜닝 휠 또는 플라이휠만으로도 제어가 가능하였던 선박들도 연료절약형 초장행정 엔진이 탑재되는 경우에는 비틀림진동 댐퍼를 적용해야만 제어가 가능하다. 본 논문에서는 비틀림진동 제어를 위해 적용된 점성-스프링 댐퍼의 동특성을 확인하고 해당 축계에 최적 동특성을 갖는 점성-스프링 댐퍼를 설계하여 비틀림진동 특성을 검토하였다. 또한, 일부 엔진증속 지연현상을 지닐 우려가 있는 선박의 경우에는 대상축계의 진동 특성을 고려하여 최적댐퍼 설계이론에 따라 선정된 파라미터를 적절히 조정함으로써 과도한 피로누적에 따른 축 절손현상을 방지할 수 있는 축계 비틀림진동 제어 방안을 제시하였다.

Keywords

References

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