Patent ID: 11970370
Assignee: ITREC B.V.
Field: Handling (Mechanical engineering)
Classification: CPC B  Y | IPC B

Claim 16:
17. A motion compensating crane, for use on an offshore vessel having a hull with a design waterline, wherein the crane comprises:
a main boom pivotally connected at an inner end thereof about a substantially horizontal boom pivot axis, said main boom having a tip end remote from said inner end;
a main boom luffing assembly adapted to set an angle of the main boom within a main boom working angle range,
wherein the main boom has a length and a main boom working angle range such that the tip end thereof is positionable in a position wherein the tip end is at least 100 meters above the design waterline of the hull of the vessel,
a mobile hoist cable suspension member,
a hoist winch and a hoist cable driven by said hoist winch, which hoist cable depends from said mobile hoist cable suspension member, wherein an object suspension device is suspended from said hoist cable,
wherein the mobile hoist cable suspension member is supported by a motion compensating support device that is fitted to the tip end of the main boom, which motion compensating support device comprises one or more motor powered motion displacement actuator assemblies and a motion compensating support device controller,
wherein the motion compensating support device is configured to provide motion compensation in one or more directions,
wherein the crane is provided with an inertial measurement device that is mounted in proximity of the tip of the main boom,
and wherein said one or more inertial measurement device is configured to provide one or more reference signals on the basis of which control signals for said motor powered motion displacement actuator assemblies are computed and provided by the motion compensating support device controller.