Controlling the relative motion between floating objects has always been a challenge in naval and offshore applications. For many of us the jump ashore from ship is easy when distance is short and sea is calm. But what about teaching a machine to make the move at an indefinite distance in a storm? To conquer this challenge of motion control requires mastering the technologies for passive as well as active compensation.

Our first generations of Active Heave Compensation (AHC) were developed for offshore application in the early 1980s. Since then the resolution and sensitivity has increased dramatically (as well as expectations). Present Active Heave Compensation systems handle accelerations up to 4 m/s2 and speeds at 4 m/s. Applying this AHC technology in cranes, ramps and winches allows for the handling of cargo between dock and ship, ship and smaller floating objects as well as between ships. It also allows for life rescue operations with a hoist from a larger ship without involving the risk of injuring personnel.

With our AHC PLC algorithms supporting today’s pump technology or frequency converters, Lidan is able to supply high sensitivity and resolution AHC systems.