Abstract
Rubber is applied to highly-elastic couplings installed in geared diesel propulsion system. Taking advantage of its high elasticity and large damping effect, torque fluctuations transmitted to gear can be diminished. However, the dynamic behaviour of the shafting system including rubber is not comprehended exactly because of their complex characteristics and scant examples of detailed measurement under actual operation.In order to make clear the dynamic characteristics, the authors did comprehensive full-scale measurement on two ships and have been analizing the results. The aim of this study is to show the actual torsional vibration of rubber damping system and to present a practical calculation method by modal analysis applicable to the system. This paper, which is the 1 st report of the study, is devoted to the illustration of the results of the full-scale measurement. At first, the framework of the measurement is explained. Then the dynamic response at each parts of rubber couplings is showed as well as general features of the rubber damping system.
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