Active heave compensation

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What is Active Heave Compensation (AHC)?

Active heave compensation is used in the marine and offshore industry to compensate the motion of a ship without using a fixed reference point. Instead, a Motion Reference Unit (MRU) enables the Active Heave Compensator to compensate the waves by measuring the roll, pitch, yaw and heave motion.

What is the difference between AHC and PHC?

First, Active Heave Compensators do not use a fixed reference point where Passive Heave Compensators do. Second, one of the major differences between Active Heave Compensation and Passive Heave Compensation lies in power consumption. AHC requires an external power source while PHC does not. A control system actively attempts to accurately compensate wave movement by using power.

When to use Active Heave Compensation?

The AHC is the best solution when there is no fixed reference point. Typical areas of application are (active) heave compensated cranes, launch and recovery systems, on/off loading systems, helicopter platforms and many other solutions in need of stable operations.