engleski

Transient Vibration of the Ship Power Train in Polar Conditions

The transient vibration of the ship power propulsion system in polar conditions is considered from numerical analysis point of view. Besides linear components the models of the ship power propulsion includes damper components that typically leads to the models that are non- classically damped. Additionally, some components have relatively high ratio of the stiffness and mass and that push higher frequencies to the very high level. That is why implementation of classification rules than impose very small time step which as consequence has low numerical efficacy. The direct integration and modal superposition are compared and implemented to the practical example of the ship power propulsion. The procedure for handling non-classical damping and load which depend on position in modal superposition approach is developed, implemented and compared with direct approach. It is demonstrated that nonlinearities due to non- classical damping and displacement/position dependent forces can be efficiently handled with proposed procedure. The paper includes a case study of the electrically powered propulsion system that includes coupling and gear reducer.

Torsional vibration ; Non-classical damping ; Modal superposition ; Transient vibration

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