Title:
OFFSHORE CRANE
Document Type and Number:
WIPO Patent Application WO/2019/190314
Kind Code:
A3
Abstract:
Offshore crane (2) compensating for local water movement. The crane has a substructure (3), a boom (5, 6), and a heave device (7, 8, 9) comprising a winch (7), a hoisting cable (8), and a gripper (9) for carrying a load (28). The boom has a fixed end supported by the substructure and a free end. The hoisting cable extends from the winch, along the boom to the free end of the boom, and suspends from the free end of the boom freely to the gripper. At the fixed end, the boom is configured for slewing with respect to the substructure around a slewing axis (13) and for luffing with respect to the substructure around a luffing axis (15), the luffing axis being perpendicular to the slewing axis. In order to compensate for local water movement, an x-axis translational movement, y- axis translational movement, z-axis translational movement, x- axis rotational movement, y-axis rotational movement and z- axis rotational movement are measured; on the basis of these measurements an x-, y-, and z-translation, experienced by the free end of the boom due to movement of the substructure, are determined; and these determined x-, y-, and z-translations are neutralized by correspondingly actuating the actuator system such that the position of the gripper is kept motionless. The invention further relates to a method for compensating such crane for local water movement.
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Inventors:
VAN DOMMELEN JORRIT LENNART (NL)
Application Number:
PCT/NL2019/050184
Publication Date:
April 02, 2020
Filing Date:
March 25, 2019
Export Citation:
Assignee:
BARGE MASTER IP B V (NL)
International Classes:
B66C13/02; B63B27/10; B66C23/52
Domestic Patent References:
| WO2014123414A1 | 2014-08-14 | |||
| WO2017103139A1 | 2017-06-22 | |||
| WO2014200354A1 | 2014-12-18 | |||
| WO2015199543A1 | 2015-12-30 | |||
| WO2013070080A1 | 2013-05-16 |
Attorney, Agent or Firm:
GROENEVELD, Y.G. (NL)
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