الفهرس 
chapter 1Only 14 pages are availabe for public view
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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.