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육상에 설치된 저속 7실린더 디젤엔진의 폭발 기진력 및 고진동 현상

High Vibration Phenomena due to Cylinder Explosion Pressure of Low-speed Diesel Engine with 7 Cylinders installed on Land

  • 김연환 (한전 전력연구원 수화력발전연구소) ;
  • 배용채 (한전 전력연구원 수화력발전연구소) ;
  • 배춘희 (한전 전력연구원 수화력발전연구소) ;
  • 이영신 (충남대학교 기계설계공학과)
  • 발행 : 2007.09.20

초록

A 7K60MC-S low speed diesel engine in a power plant has frequently experienced high vibration since the unit completed construction works. Up to date, no fundamental vibration solutions were reached. Hence, several vibration tests and analyses were conducted to identify the root cause of this high vibration and to suggest the optimal countermeasures for diesel engine. The 9.25 Hz and 25.4 Hz vibrations have been observed on main body during operation. The magnitude of engine upper structural vibration is generally similar in horizontal transverse direction. However, differences in the 'Fore' and 'After' vibration magnitude with the same vibration phase angle at 9.25 Hz occur due to the explosion pulsations of 7 cylinders and the Inertia momentum added by the SCR (selective catalytic reduction) duct system. It was analyzed that the excess structural vibration occurred when the natural frequency of engine body is affected by the exciting sources due to the explosion pressure and the discharge pulsation of the seven cylinders in resonance range.

키워드

참고문헌

  1. Park, J.-P. and Shin, E.-T., 2000, 'Structural Vibration Analysis of a Large Two-stroke Engine and Foundation System for Stationary Power Plants', Journal of KSNVE, Vol. 10, No. 3, pp. 493-499
  2. Lee, D. C. and Kim, S. H. 2006, 'A Study on Shaft Fatigue Strength due to Torsional Vibrations in Two Stroke Low Speed Diesel Engines', Proceedings of the KSNVE Annual Autumn Conference, KSNVE06A-22-04
  3. Park, J.-P., 2001, 'Vibration/Structural Integrity Analysis for Large Diesel Engines' , Proceedings of the KSNVE Annual Spring Conference, pp. 41-49
  4. ISO, 1991, Reciprocating Internal Combustion Engine Driven Alternating Current Generating Sets-Part 9 : Measurement and Evaluation of Mechanical Vibrations (ISO 8528-9)
  5. KHIC, 'Instruction Book for KHIC-MAN B&W Main Diesel Engine'
  6. MAN B&W, 1997, 'MAN B&W Diesel Two-stroke Uniflow Engine for Power Generation Type 7K60MC-S'

피인용 문헌

  1. Study on the Vibration of Diesel Engine Generator of Drill Ship vol.33, pp.4, 2009, https://doi.org/10.5916/jkosme.2009.33.4.502