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Motion compensator

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A motion compensator is a device that decreases the negative impact of the relative movement of two objects on the connection between these objects. In general a motion compensator is built in the connection between a floating object and the connection to the seabottom, or the connection to another vessel, or a fixed structure. The motion compensator does not compensate the motion, but tries to eliminate the negative influence of the movement (difference).

The simplest motion compensator is the anchor chain of a floating object. The shape of the chain makes that in case of moving of the ship, the forces on the anchor and the ancher chain remain acceptable. In general however a motion compensator is a "spring". For large forces this spring is in general a hydro pneumatic spring: a plunger cylinder connected to a gas volume.

Fine examples of motion compensators are:

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