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아지무스 추진기의 감속 기어 윤활용 오리피스 파이프 진동특성과 방진대책
엄기탁(Gitak Eam),로날드 디 바로(Ronald D. Barro),이돈출(Donchool Lee) 한국소음진동공학회 2013 한국소음진동공학회 학술대회논문집 Vol.2013 No.4
A type of electric propulsion employed by specialized purpose vessels or offshore is the azimuth thruster. Azimuth thruster application had been increasing recently and resulted to excellent vessel maneuverability. However, this system is very complex and some of its major component being exposed under the seawater level presents difficulty in sealing design. For Polar class icebreaker operating in extreme sea condition, this requires a high level of reliability and safety. In this study, the characteristics of lubricating orifice pipe structural vibration installed at the lower reduction gear were investigated and analyzed through beam analysis theory and comparison of experiments. Propeller excitation and the resonant modes of vibration causing excessive vibration and suitable countermeasures to prevent damage due to vibration fatigue on the pipe are presented.
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.