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가변 속도 유도 전동기에서 발생한 펄스 토크에 의한 회전축계의 비틀림진동 현상
이돈출(Donchool Lee),버광다오(QuangDao Vuong),남택근(Taekkun Nam) 한국소음진동공학회 2015 한국소음진동공학회 논문집 Vol.25 No.6
Recently, commercial ships and other specialized vessels with electric propulsion system employ variable speed induction motor as its prime mover. The wide application of electrical motors also includes being the main drive system in most industrial machineries. However, during its start-up, shutdown, and brake switch operation, excessive torque variation are generated. As such, flexible coupling are installed in order to reduce the transmitted torque fluctuation to the driven side. In this paper, the pulse torque generated by an variable speed induction motor was analyzed theoretically and through measurement of torsional vibration. Induction motor with inverter on marine propulsion system and industrial compressor were used as experimental subjects. The study confirmed that pulse torque are generated regardless of motor speed and interpreted as a vibration source of the whole system. Results presented herein can be adopted as the basis in future amendment of inspection classifying body regulations.
고속 4행정 디젤엔진을 갖는 선박 추진시스템에서 토크변동에 의한 감속기어 안정성 평가
김인섭(InSeob Kim),윤현우(Hyunwoo Yoon),김준성(Junseong Kim),버광다오(QuangDao Vuong),이돈출(Donchool Lee) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.10
Maritime safety has been more critical recently due to the occurrence of shipboard accidents involving prime movers. As such, the propulsion shafting design and construction plays a vital role in the safe operation of the vessel other than focusing on being cost-efficient. Smaller vessels propulsion shafting system normally install high speed four-stroke diesel engine with reduction gear for propulsion efficiency. Due to higher cylinder combustion pressures, flexible couplings are employed to reduce the increased transmitted torque. In this paper, an actual vibration measurement and theoretical analysis was carried out on a propulsion shafting with V18.3L engine installed on small car-ferry and revealed higher torsional vibration resonance. Hence, a rubber-block type flexible coupling was installed to attenuate the transmitted vibratory torque. Considering the flexible coupling application factor, reduction gear stability due to torque variation was analyzed in accordance with IACS M56 and the results are presented herein.
고속 4행정 디젤엔진을 갖는 선박 추진시스템에서 토크변동에 의한 감속기어 안정성 평가
김인섭(InSeob Kim),윤현우(Hyunwoo Yoon),김준성(Junseong Kim),버광다오(QuangDao Vuong),이돈출(Donchool Lee) 한국소음진동공학회 2015 한국소음진동공학회 논문집 Vol.25 No.12
Maritime safety has been more critical recently due to the occurrence of shipboard accidents involving prime movers. As such, the propulsion shafting design and construction plays a vital role in the safe operation of the vessel other than focusing on being cost-efficient. Smaller vessels propulsion shafting system normally install high speed four-stroke diesel engine with reduction gear for propulsion efficiency. Due to higher cylinder combustion pressures, flexible couplings are employed to reduce the increased vibratory torque. In this paper, an actual vibration measurement and theoretical analysis was carried out on a propulsion shafting with V18.3L engine installed on small car-ferry and revealed higher torsional vibration. Hence, a rubber-block type flexible coupling was installed to attenuate the transmitted vibratory torque. Considering the flexible coupling application factor, reduction gear stability due to torque variation was analyzed in accordance with IACS(International Association of Classification Societies) M56 and the results are presented herein.