한국해양대학교

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디젤기관에 직결된 발전기의 비틀림진동에 관한 연구

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dc.contributor.author 李昌勳著 -
dc.date.accessioned 2017-02-22T06:01:00Z -
dc.date.available 2017-02-22T06:01:00Z -
dc.date.issued 2001 -
dc.date.submitted 56797-10-27 -
dc.identifier.uri http://kmou.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002173837 ko_KR
dc.identifier.uri http://repository.kmou.ac.kr/handle/2014.oak/8956 -
dc.description.abstract The abundant research on the torsional vibration of propulsion shafting system have been reported, but a research on shafting system of a generator driven diesel engine has hardly been reported. The reason is that a generator driven diesel engine is driving at a constant speed differently from that of the propulsion engine, therefore it seems to be unnecessary to consider deeply the torsional vibration condition of the generator shaftings as of the main engine at the design stage. However, due to increase of the power of engine, being compact of generator and improving ofperformance, the torsional vibration of a generator driven diesel engine is increasing. It causes the excessive additional torsional stress on the shafting system, which lead to the break-down of the shaft. Consequently it become necessary to exactly analyze the torsional vibration of the generator shafting and estimate the safety of the relevant shafting system. In general, the natural frequency of the generator shafting is analyzed using a equivalent mass-elastic model. As a generator shafting has the long keyed armature shaft, the natural frequency varies significantly according to the modeling methods for transferring the stiffness of generator shafting to equivalent mass-elastic system. Therefore, in this study the adequate modeling methods for assessing the determination of stiffness of the long keyed armature shafts is firstly investigated. Also these methods are applied to shafting system of a generator driven diesel engine for analyzing of natural and forced torsional vibration in whole operating range using the transfer matrix method. As the measurement of forced torsional vibration of diesel engine coupled to generator was conducted at no load conditions, torsional vibratory amplitude was analyzed in view of the ratios of excitation force for diesel engine. It was confirmed from the analysis that the exciting force when the measurement of forced torsional vibration of diesel engine coupled to generator was conducted at no load condition is 15%. And the method for transforming the vibratory amplitude measured at the fore-end of crankshaft to the additional stress of the shaft with nodal point was presented. The reliability of the computer program used in this study was confirmed by comparing the measured with the calculated results for the torsional vibration of the generator shafting. -
dc.description.tableofcontents Abstract 1. 서론 = 1 2. 발전기축의 모델링 = 3 2.1 발전기축의 모델링 = 3 2.2 발전기축의 강성계수 = 5 2.2.1 커플링의 강성계수 = 6 2.2.2 단이 있는 축의 강성계수 = 8 2.2.3 긴 키이?㉯? 갖는 회전자축의 강성계수 = 9 3. 전달매트릭스법에 의한 축계의 비틀림진동 해석 = 11 3.1 자유진동 해석 = 11 3.2 고유진동수 및 진동모드 해석 = 15 3.3 비틀림진동 기진력 = 19 3.4 강제진동 해석 = 24 4. 발전기 축계의 비틀림진동 해석 및 고찰 = 28 4.1 발전기 축계의 구성 = 29 4.1.1 축계의 모델링 = 31 4.1.2 축계의 강성계수 = 32 4.2 발전기 축계의 비틀림진동 측정 = 33 4.3 측정결과와 해석결과의 비교 및 고찰 = 36 4.3.1 비틀림 고유진동수 비교 = 37 4.3.2 비틀림 진동진폭의 비교 = 39 4.3.3 발전기축의 부가응력 계산 = 42 5. 결론 = 48 참고문헌 = 49 -
dc.publisher 한국해양대학교 대학원 -
dc.title 디젤기관에 직결된 발전기의 비틀림진동에 관한 연구 -
dc.title.alternative A Study on the Torsional Vibration for Diesel Generator Shaftings -
dc.type Thesis -
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기계공학과 > Thesis
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