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Description
In modern ship power plants with electric propulsion motors, the main ship power system consists of powerful multi-cylinder diesel generators. The engine and the generator are mounted on a common frame, which is attached to the ship's hull through resilient (elastic) elements.
Minimizing the vibrations induced in the ship's hull is achieved by refining the mechano-mathematical models. In the present work, this is performed using a mechano-mathematical model in which the diesel-generator-frame system is modeled as an elastic body with distributed parameters.
A model has been developed in which the ship's power plant undergoes vibrations in a single plane. The resulting system of differential equations describes the forced vibrations of the proposed dynamic model.
The natural frequencies of free vibrations have been obtained. Forced vibrations excited by the imbalance of the generator rotor are investigated.
Results from experimental studies of a nine-cylinder diesel generator are presented.
The presented theoretical and experimental results demonstrate the necessity of accounting for bending vibrations when investigating the overall vibrations of resiliently mounted multi-cylinder diesel generators.