Marine Traffic-Seminar in Marine Traffic System Design,Maritime Safety,Live Vessels

It is a known fact that every running machine has a tendency to vibrate because of several moving parts incorporated within it. When in motion, the machine will have an oscillatory motion around an equilibrium point. This is the basic definition of vibration, a phenomenon common with all kinds of mechanical equipment.

In a 2 stroke marine propulsion engine there are basically 3 types of vibrations that act on the engine when it is in operating condition:
1. Longitudinal Vibration
This type of vibration occurs as a result of guide forces resulting from transverse reaction forces on the crossheads. The transverse reaction forces are generated when connecting rod and crankshaft mechanism converts reciprocating motion in to rotary motion. Such vibrations move the engine top athwart ship causing rocking or twisting.
2. Axial Vibration
Axial vibration is a kind of longitudinal shafting vibration which occurs in the crankshaft because of the radial as well as tangential forces.
3. Torsional Vibration
Torsional Vibration occurs in the crankshaft of the engine mainly because of the tangential forces acting on the crankshaft when rotating at some RPM.

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Marine Traffic Seminar