الفهرس | Only 14 pages are availabe for public view |
Abstract Shafting torsional vibrations may become a cause of serious damages, even fractures of the shaft. The need is 10 maintain torsional vibration stresses below values, recommended by the classification societies. A new design approach for propulsion shafting sys1m1 is proposed in this thesis. On the other hand, a vibration problem may be originated from the machinery system 10 the ship structure by its supporting foundation. For this reason the Finite Element concept in predicting the dynamic properties of a certain design is discussed. A case study of a 2-stroke, 6 cylinder marine diesel engine illustrates the vibration aspects of an actual marine propulsion system is presented. The analysis bas been carried out according 10 the proposed design approach with a developed computer program and compared with the basic design approaches. A finite element model for the engine foundation bas been built to analyze and to evaluate its d:ynamie prosperities. The exciting forces and moment for the propulsion machinery, its incompatibility with hull and the vibration n:sponse of the system are also investigated. |