Shafting vibration primer

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All onboard machines, devices and structures are more or less subjected to the influence of vibrations. The vibration movement, or vibrations, is a special type of object movement in which the object (machine, device or structure) oscillates around some neutral position (equilibrium state).

Propeller shaft torsional stress as a function of crank angle and engine speed

There are various sources of vibrations, as well as various kinds of vibration movement.

The consequences of a vibration movement vary greatly, from mere inconvenience for a human body, to the fatigue and stress that arise in the parts of machines, devices or structures.

Unacceptably high vibration levels may become the source of pain for the human bodies and the cause of malfunction or even the collapse of machines, devices and structures.


When propulsion shafting vibrations are involved, there are three distinct types of vibration movement, each with specific sources, characteristics and consequences. These tree kinds of shafting vibrations are torsional, axial and lateral vibrations.

To learn more, please select:


Shafting torsional vibrations

Shafting axial vibrations

Shafting lateral vibrations

Questions & answers

Intermediate shaft single harmonic torsional stress as a function of engine speed

   


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The contents of this and the subsequent pages are partly based on the text published in the article: G. Magazinovic, "On Torsional Vibrations of the Propulsion Plant Shafting", Ukorak s vremenom (1998)18, 11-14 (in Croatian). Copyright 1998, Marine Engineers Association, All rights reserved.
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