Design of Marine Diesel Propulsion System Including Highly-Elastic Rubber Couplings

概要

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In the marine propulsion system with geared diesel engine, highly-elastic elements such as rubber couplings are installed between main engine and reduction gear mainly to prevent the chattering of gear wheel. The failures of rubber couplings are, in many cases, found in the shafting system with large engine, and sometimes occur in a short period of time. Most of the failures are caused by the torque fluctuations due to torsional vibration of shafting system. Continuous running of main engine at peak of torsional vibration particularly increases the possibility of failures because of the heat generation within rubber elements. This paper shows the investigated results on service period of rubber couplings and the causes of failure. In terms of the torsional vibration calculations, the outline of calculating method using modal analysis technique is described. And, as the guidelines for shafting design, allowable vibratory torques, allowable power loss and fatigue curves for rubber couplings are described.
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