F02 Passive compensation.zip (4.7 MB) – Description PDF
During the lowering process the heave of the vessel can result in severe motions of the payload and/or high loads on the crane.
To reduce these effects, heave compensation devices are often used. These can be active systems that adjust winch payout to keep the payload at a constant depth or passive systems where the payload is allowed to move but there is additional compliance with damping to reduce the loads on the crane when it heaves upwards.
This example considers the passive system, using a CRANEMASTER device as an example. The principles can also be applied to other devices.