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선박 추진축계의 2절 비틀림 진동에 기인한 주 기관 상부 구조 진동 현상과 방진 대책
이돈출(Donchool Lee),김준성(Junseong Kim),김진희(Jinhee Kim) 한국소음진동공학회 2013 한국소음진동공학회 학술대회논문집 Vol.2013 No.4
For the past years, higher power rating 2 stroke super long stroke diesel engines having more than 8 cylinders and larger cylinder bore are installed mainly on very large containerships to save on fuel consumption. However, these engines are prone to X-mode vibration due to 2nd node torsional vibration or the X-type moment, particularly because of the increase in total length and height. Recently, cases of excessive X-mode vibration often occurred on engine’s major components. This vibration is manifested also as secondary vibration causing failure in engine-mount large structures. This study investigated the excitations caused by the 2nd node propulsion shafting torsional vibration that influence X-mode vibration of the main engine and practical countermeasures are proposed. An 8RT-82RT-flex 8 cylinder engine and 11S90S-ME 11 cylinder engine for a container ship was used as research model.
55피트급 세일링 요트의 프로펠러 유기 소음·진동 현상
이돈출(Donchool Lee),김호빈(Hobin Kim),엄기탁(Gitak Eam) 한국소음진동공학회 2013 한국소음진동공학회 학술대회논문집 Vol.2013 No.10
The demand for sailing yacht is increasing in consonance the improvement of people’s live. These yachts can be dually propelled by wind and by diesel engine power. A singing (humming, whistling) phenomenon induced on the propeller was discovered on a 55-foot catamaran sailing yacht. As a result, an increase in the structural vibration of the stern tube room and propulsion system with abnormal noise was detected due to this flow. In this study, the cause of the phenomenon is investigated and its possible countermeasures proposed.