KR-20260064456-A - HYBRID MOORING LOAD REDUCTION DEVICE AND METHOD FOR HYBRID MOORING LOAD REDUCTION USING THE SAME

KR20260064456AKR 20260064456 AKR20260064456 AKR 20260064456AKR-20260064456-A

Abstract

A hybrid tensile load reduction device and a hybrid tensile load reduction method using the same are provided. According to embodiments of the present invention, during the process in which a tensile load is applied by a mooring chain, an upper spring, a lower spring, an electromagnetic structure, and a magnetorheological fluid interact to control the movement speed of the piston in the vertical direction, thereby enabling an improved tensile load reduction effect to be achieved in a limited space.

Inventors

김대환
김수한
고성운
유태성
신승철
김삼성

Assignees

주식회사 에이스이앤티

Dates

Publication Date: 20260507
Application Date: 20250429
Priority Date: 20241031

Claims (10)

A main body formed by extending in one direction and having a receiving space of a predetermined size inside, said receiving space filled with magnetorheological fluid; An up-and-down moving body comprising an upper plate provided on the upper part of the main body and moving up and down according to the tensile load applied to the mooring chain, and a piston having one end attached to the lower surface of the upper plate and the other end protruding to the outside of the lower side of the main body and connected to the mooring chain; and A tensile load reduction member comprising an upper spring provided at the lower part of the upper plate and arranged to surround the piston, an electromagnetic structure provided at the lower part of the upper spring, and a lower spring provided at the lower part of the electromagnetic structure and arranged to surround the piston, A hybrid tensile load reduction device in which power is applied to the electromagnetic structure as the displacement of the electromagnetic structure changes, thereby changing the viscosity of the magnetorheological fluid located between the electromagnetic structure and the inner wall of the main body.
In claim 1, The above electromagnetic structure is, An electromagnet formed to surround the above piston; and A hybrid tensile load reduction device comprising a coil wound around the above-mentioned electromagnet.
In claim 2, A groove of a predetermined size is formed in the above electromagnet, and A hybrid tensile load reduction device in which the coil is wound around the above-mentioned groove.
In claim 3, The above electromagnetic structure is composed of multiple layers, and A hybrid tensile load reduction device in which multiple grooves are formed at predetermined intervals for each layer.
In claim 3, A hybrid tensile load reduction device, wherein a gap of a predetermined size is formed between the outermost end of the electromagnet and the coil wound in the groove and the inner wall of the main body for the magnetorheological fluid to pass through.
In claim 3, A displacement measuring sensor provided on one side of the main body or the electromagnetic structure to measure displacement in the vertical direction of the electromagnetic structure; and A hybrid tensile load reduction device further comprising a power control unit connected to the coil and controlling the magnitude of the power applied to the coil according to the displacement measured by the displacement measuring sensor.
In claim 6, A hybrid tensile load reduction device in which the magnitude of the power applied to the coil increases as the position of the electromagnetic structure approaches the bottom of the main body, and the magnitude of the power applied to the coil decreases as the position of the electromagnetic structure moves away from the bottom of the main body.
In claim 7, A hybrid tensile load reduction device in which the movement speed of the piston is varied by the electromagnetic structure and the magnetorheological fluid according to the magnitude of the power applied to the coil.
In claim 8, A hybrid tensile load reduction device in which, as the magnitude of the power applied to the coil increases, the viscosity of the magnetorheological fluid located between the electromagnetic structure and the inner wall of the main body increases, thereby restricting the movement of the piston moving toward the lower side of the main body by the magnetorheological fluid, and as the magnitude of the power applied to the coil decreases, the viscosity of the magnetorheological fluid located between the electromagnetic structure and the inner wall of the main body decreases, and at the same time, the movement of the piston is induced toward the upper side of the main body by the lower spring.
A hybrid tensile load reduction method using a hybrid tensile load reduction device described in any one of claims 1 to 9, wherein A step of providing a main body that is extended in one direction and has a receiving space of a predetermined size inside; A step of providing an up-and-down moving body comprising an upper plate provided on the upper part of the main body and moving up and down according to a tensile load applied to a mooring chain, and a piston having one end attached to the lower surface of the upper plate and the other end protruding to the outside of the lower side of the main body and connected to the mooring chain; A step of providing a tensile load reduction member comprising an upper spring arranged to surround the piston at the lower part of the upper plate, an electromagnetic structure arranged at the lower part of the upper spring, and a lower spring arranged to surround the piston at the lower part of the electromagnetic structure; A step of filling the above receiving space with magnetorheological fluid; and A hybrid tensile load reduction method comprising the step of applying power to the electromagnetic structure as the displacement of the electromagnetic structure changes, thereby changing the viscosity of the magnetorheological fluid located between the electromagnetic structure and the inner wall of the main body.

Description

Hybrid Mooring Load Reduction Device and Hybrid Mooring Load Reduction Method Using the Same Embodiments of the present invention relate to a technology for reducing tensile loads caused by mooring chains that moor a floating body during the process of the floating body heaving. Generally, wind power generation is the process of converting wind energy into mechanical energy using devices such as wind turbines, and then using this energy to rotate a generator to produce electricity. Wind power generation is classified into onshore and offshore types depending on the installation location; recently, among offshore wind power generation, research and development is actively underway on floating offshore wind power, a type in which the lower floating structure floats on the seabed rather than being fixed to it. Unlike fixed-type offshore wind turbines that are anchored to the seabed, the offshore floating structures applied to such floating offshore wind power generation are subject to loads caused by the marine environment, such as wind, waves, and currents. Accordingly, mooring chains for stably mooring the offshore floating structures and fairleads for connecting the mooring chains to the offshore floating structures are installed together with the offshore floating structures. At this time, during the process of installing mooring chains and fairleads, it is common practice to design the appropriate capacity of the fairleads and mooring chains within the allowable range of the load offset caused by the marine environment; however, when the marine environment changes rapidly, the load offset caused by the marine environment often exceeds the allowable range. Measures to minimize the tensile load caused by such mooring chains include reducing the tensile load by adjusting the weight of the mooring chain through the connection of a buoyancy body to the mooring chain, or adjusting the tensile load of the mooring chain using an elastic body. FIG. 1 is a schematic diagram for explaining a hybrid tensile load reduction device according to a first embodiment of the present invention. FIG. 2 is a schematic diagram for explaining a hybrid tensile load reduction device according to a first embodiment of the present invention. FIG. 3 is a schematic diagram for explaining a hybrid tensile load reduction device according to a first embodiment of the present invention. FIG. 4 is a drawing showing the detailed configuration of a hybrid tensile load reduction device according to the first embodiment of the present invention. FIG. 5 is a drawing showing the detailed configuration of a hybrid tensile load reduction device according to the first embodiment of the present invention. FIG. 6 is a drawing for explaining the process of reducing the tensile load by a mooring chain in a hybrid tensile load reduction device according to the first embodiment of the present invention. FIG. 7 is a drawing for explaining the process of reducing the tensile load by a mooring chain in a hybrid tensile load reduction device according to the first embodiment of the present invention. FIG. 8 is a drawing for explaining the process of reducing the tensile load by a mooring chain in a hybrid tensile load reduction device according to the first embodiment of the present invention. FIG. 9 is a drawing for explaining the process of reducing the tensile load by a mooring chain in a hybrid tensile load reduction device according to the first embodiment of the present invention. FIG. 10 is a schematic diagram for explaining a hybrid tensile load reduction device according to a second embodiment of the present invention. FIG. 11 is a schematic diagram illustrating a hybrid tensile load reduction device according to a second embodiment of the present invention. FIG. 12 is a drawing showing the detailed configuration of a hybrid tensile load reduction device according to a second embodiment of the present invention. FIG. 13 is a drawing showing the detailed configuration of a hybrid tensile load reduction device according to a second embodiment of the present invention. FIG. 14 is a drawing showing the detailed configuration of a hybrid tensile load reduction device according to a second embodiment of the present invention. FIG. 15 is a drawing showing the detailed configuration of a hybrid tensile load reduction device according to a second embodiment of the present invention. FIG. 16 is a drawing for explaining the process of reducing the tensile load by a mooring chain in a hybrid tensile load reduction device according to a second embodiment of the present invention. FIG. 17 is a drawing for explaining the process of reducing the tensile load by a mooring chain in a hybrid tensile load reduction device according to a second embodiment of the present invention. FIG. 18 is a drawing for explaining the process of reducing the tensile load by a mooring chain in a hybrid tensile load reduction device according to a second embodiment of the present inventi