A bidirectional hydraulic damping energy absorbing typhoon-resistant mooring system

Abstract

The present invention discloses a bidirectional hydraulic damping energy-absorbing typhoon-resistant mooring system, comprising an anchor chain and an anchor chain compartment. Two opposing windlass rollers are provided in the anchor chain compartment, two opposing bidirectional hydraulic dampers are provided between the two windlass rollers, and an anchor chain adjustment device is provided between the two bidirectional hydraulic dampers. The anchor chain adjustment device is used to adjust the stiffness of the anchor chain mooring line, the pre-tension applied thereto, and the length of the anchor chain out of the compartment. The two ends of the anchor chain serve as anchor points, and the anchor chain between the two ends passes through the windlass rollers, the bidirectional hydraulic dampers, and the anchor chain adjustment device. By providing a bidirectional hydraulic damper, the system overcomes the work performed by the hydraulic damper, reducing its displacement and speed, regardless of whether the floating structure moves in the direction of wave incidence or in the opposite direction. This prevents the mooring line from possessing a large potential energy converted from the kinetic energy of the floating body, causing the mooring line to approach a straightened state and thereby risking breakage.

Description

Technical Field

[0001] The present invention relates to the field of marine anchoring technology for marine vessels, floating structures and the like, and in particular to a bidirectional hydraulic damping energy absorbing typhoon-resistant mooring system. Background Art

[0002] The ocean holds enormous energy, including abundant reserves of oil and gas resources and new energy. Developing the vast ocean requires the construction of stable offshore floating structures. Currently, the world's deep-sea floating structures face the problem of typhoon resistance. Statistics show that mooring systems account for more than 30% of the total cost of offshore floating systems, and even as high as 70% for some projects. Designing a safe, reliable, and economical mooring system will greatly reduce the total cost of offshore floating structure systems and promote the development of the marine economy.

[0003] Traditional mooring systems for floating structures at sea are primarily catenary mooring systems, which utilize the gravitational potential energy of the catenary or the elastic potential energy of the material to resist the work done by environmental loads on the floating structure. However, in extreme sea conditions, floating structures are subject to significant forces from wind, waves, and currents, which drive the floating structure to oscillate rapidly over long distances. This results in significant kinetic energy being exerted on the structure, which often causes the catenary to straighten, leading to breakage.

[0004] There are two traditional methods to solve the problem of typhoon resistance of offshore floating structures. The first is to increase the capacity of the catenary to store gravitational potential energy, mainly through technical means such as increasing the strength of the anchor chain, increasing the chain diameter of the anchor chain, increasing the length of the anchor chain, and increasing the number of anchor chains. This method can improve the typhoon resistance of the mooring system to a certain extent, but it greatly increases the cost of the mooring system; the second method is to use a mooring line with multiple components, adding elastic materials, sinkers, buoys, etc. on the basis of the catenary mooring line, thereby improving the energy storage capacity of the entire mooring system. However, this method increases the difficulty of the deployment project of the mooring system, is costly, and has poor reliability. Summary of the Invention

[0005] In order to solve at least one technical problem existing in the above-mentioned background technology, the present invention provides a bidirectional hydraulic damping energy absorption anti-typhoon mooring system, which is designed to limit the movement of the floating body from the source, and reduces the total energy of the system by limiting the back-and-forth oscillation displacement and speed of the floating body. At the same time, the hydraulic system can be used to store the system energy in one direction, making the entire system a non-conservative field, further reducing the energy of the entire system.

[0006] To achieve the above object, the technical solution of the present invention is:

[0007] A bidirectional hydraulic damping energy absorbing typhoon-resistant mooring system comprises an anchor chain and an anchor chain compartment, and also comprises two opposing windlass rollers, two opposing bidirectional hydraulic dampers are provided between the two windlass rollers, and an anchor chain adjusting device is provided between the two bidirectional hydraulic dampers, the anchor chain adjusting device being used to adjust the stiffness and pre-tension of the anchor chain mooring line and the length of the anchor chain leaving the compartment;

[0008] Both ends of the anchor chain are used as anchor points, and the anchor chain between the two anchor points passes through an anchor windlass roller, a bidirectional hydraulic damper and an anchor chain adjusting device.

[0009] Furthermore, the anchor chain adjusting device includes an upper row of rollers and a lower row of rollers, the anchor chain passes through the upper row of rollers and the lower row of rollers in an alternating manner up and down, and the distance between the upper row of rollers and the lower row of rollers is adjustable.

[0010] Furthermore, the lower row rollers are fixed to the anchor chain compartment, and the upper row rollers are movable and adjustable.

[0011] Furthermore, the two anchor points are respectively designated as point A and point G, the windlass roller and hydraulic damper close to point A are regarded as point B and point C, and the hydraulic damper and windlass roller close to point G are regarded as point E and point F.

[0012] Furthermore, in the case of small waves, when the force on the anchor chain mooring line AB or FG does not reach the damping force opening threshold of the bidirectional hydraulic damper, the entire mooring system is in a catenary mooring conservative system.

[0013] Furthermore, when there are big waves, when the force on the anchor chain mooring line AB or FG reaches the damping force opening threshold of the two-way hydraulic damper, no matter whether the force on the anchor chain mooring line AB or FG reaches the damping force opening threshold, the system will simultaneously open the two two-way hydraulic dampers. At this time, the anchor chain drives the two two-way hydraulic dampers to rotate and overcome the hydraulic damping to do external work. The anchor chain mooring lines AB and FG complete the load transfer. At this time, the system is in an absorbing non-conservative mooring system.

[0014] Furthermore, the upper row of rollers is provided with three rollers.

[0015] Furthermore, the lower row of rollers is provided with four rollers.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This invention utilizes a bidirectional hydraulic damper to overcome the work performed by the damper, reducing displacement and velocity, regardless of whether the floating structure is moving in or out of the direction of wave incidence. This prevents the mooring line from acquiring significant potential energy, converted from the kinetic energy of the floating structure, which could cause the line to become stretched and break. Furthermore, the double-row pulleys within the anchor chain compartment adjust the anchor chain stiffness and length. When the anchoring forces are high, the distance between the double-row pulleys is reduced, reducing mooring line stiffness and allowing for more anchor chain length, thereby reducing mooring loads. This invention ultimately makes the floating structure mooring system typhoon-resistant. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the composition of a bidirectional hydraulic damping energy absorbing typhoon-resistant mooring system provided in an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the motion process of a bidirectional hydraulic damping energy absorbing typhoon-resistant mooring system provided by an embodiment of the present invention;

[0020] Figure 3 A second schematic diagram of the motion process of the bidirectional hydraulic damping energy absorbing typhoon-resistant mooring system provided by an embodiment of the present invention; DETAILED DESCRIPTION

[0021] Example:

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified or limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a signal connection; it can be a direct connection or an indirect connection through an intermediate medium, which can be said to be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific circumstances. The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0023] The low-frequency waves that float structures at sea experience are the primary cause of long-distance drift and oscillation, causing them to oscillate back and forth with enormous kinetic energy. When a floating structure is constrained by a mooring system, the entire system is in a conservative system where the kinetic energy of the floating object and the potential energy of the mooring line are converted back and forth. When the kinetic energy of the floating body is zero, the potential energy accumulated in the mooring line is at its maximum. If the environmental load at this moment drives the floating structure further in the direction of tensioning the mooring line, or in a trend toward movement, the mooring line will tend to straighten or produce material deformation until the anchor chain breaks. To address this technical challenge, this embodiment provides a bidirectional hydraulic damping, energy-absorbing, typhoon-resistant mooring system.

[0024] like Figure 1As shown, A and G represent anchor points, B and F represent windlass rollers, C and E are bidirectional hydraulic dampers (structured in roller form). Whether the anchor chain drives the bidirectional hydraulic resistance C and E to rotate forward or backward, the hydraulic damping needs to be driven to do work. D is the anchor chain compartment, L1 is the upper row roller, L2 is the lower row roller, L2 is fixed to the anchor chain compartment, and L1 is movable and adjustable. It can adjust the anchor chain mooring line stiffness and the pre-tension size as well as the length of the anchor chain out of the compartment by adjusting the distance from L2. Specifically, the upper row of rollers is provided with three rollers, and the lower row of rollers is provided with four rollers. The anchor chain passes through the upper and lower row rollers in an alternating manner.

[0025] In the case of small waves, the force on the anchor chain mooring line AB or FG is small and cannot reach the damping force threshold of the bidirectional hydraulic damper. At this time, the device drifts a distance S under the action of waves. Figure 2 As shown in the figure, the entire mooring system is in the catenary mooring conservative system; when there are big waves, the anchor chain mooring line AB or FG is subjected to greater force, such as Figure 3 As shown in the figure, the device drifts a distance Smax under the action of waves. At this time, the force on the bidirectional hydraulic damper C reaches the opening threshold. The hydraulic damping that needs to be driven when the bidirectional hydraulic dampers C and E roll is the same hydraulic system. Regardless of whether the force on the anchor chain mooring line AB or FG reaches the hydraulic damping force opening threshold, the system will simultaneously open the bidirectional hydraulic dampers C and E. At this time, the anchor chain drives the bidirectional hydraulic dampers C and E to rotate and overcome the hydraulic damping to perform external work. The anchor chain mooring lines AB and FG complete the load transfer. At this time, the system is in an absorbing non-conservative mooring system.

[0026] Since the rotation of the two-way hydraulic dampers C and E requires overcoming the hydraulic damping to perform external work, the presence of the hydraulic damping reduces the movement displacement of the device and the operating speed, thereby reducing the peak value in the time history curve of the kinetic energy and potential energy conversion of the entire floating structure and the mooring line. This avoids the situation where the huge kinetic energy of the floating body movement is converted into huge potential energy of the mooring line, driving the mooring line to be in a state of being about to be straightened, resulting in the risk of the mooring line breaking. Therefore, the present invention will effectively avoid such phenomena and ensure the safety of the mooring against typhoons.

[0027] As can be seen, the system, by providing a bidirectional hydraulic damper, overcomes the work of the hydraulic damper, reducing its displacement and velocity, regardless of whether the floating structure moves in the direction of wave incidence or the opposite direction. This prevents the mooring line from accumulating significant potential energy, converted from the kinetic energy of the floating structure, which could cause the mooring line to become stretched and break. Furthermore, the system adjusts the anchor chain stiffness and operating length through the double-row pulleys within the anchor chain compartment. When the anchoring force is high, the distance between the double-row pulleys is reduced, reducing the mooring line stiffness and allowing for more anchor chain length, thereby reducing the mooring load. This invention will ultimately make the floating structure mooring system typhoon-resistant.

[0028] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made based on the essence of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A bidirectional hydraulic damping energy absorbing typhoon-resistant mooring system, comprising an anchor chain and an anchor chain bin, characterized in that: The invention also includes two oppositely disposed windlass rollers, two oppositely disposed bidirectional hydraulic dampers are provided between the two windlass rollers, and an anchor chain adjusting device is provided between the two bidirectional hydraulic dampers, the anchor chain adjusting device being used to adjust the stiffness and pre-tension of the anchor chain mooring line and the length of the anchor chain out of the warehouse; The two ends of the anchor chain are used as anchor points, and the anchor chain between the two anchor points passes through the windlass roller, the two-way hydraulic damper and the anchor chain adjustment device; The anchor chain adjusting device includes an upper row of rollers and a lower row of rollers, the anchor chain passes through the upper row of rollers and the lower row of rollers in an alternating manner, and the distance between the upper row of rollers and the lower row of rollers is adjustable; The two anchor points are point A and point G. The windlass roller and hydraulic damper near point A are considered points B and C, and the hydraulic damper and windlass roller near point G are considered points E and F. When there are big waves, when the force on the anchor chain mooring line AB or FG reaches the damping force opening threshold of the two-way hydraulic damper, no matter whether the force on the anchor chain mooring line AB or FG reaches the damping force opening threshold, the system will simultaneously open the two two-way hydraulic dampers. At this time, the anchor chain drives the two two-way hydraulic dampers to rotate and overcome the hydraulic damping to do external work. The anchor chain mooring lines AB and FG complete the load transfer. At this time, the system is in an absorbing non-conservative mooring system.

2. The bidirectional hydraulic damping energy absorbing typhoon-resistant mooring system according to claim 1, characterized in that: The lower row rollers are fixed to the anchor chain compartment, and the upper row rollers are movable and adjustable.

3. The bidirectional hydraulic damping energy absorbing typhoon-resistant mooring system according to claim 1, characterized in that: In the case of small waves, when the force on the anchor chain mooring line AB or FG does not reach the damping force opening threshold of the bidirectional hydraulic damper, the entire mooring system is in a catenary mooring conservative system.

4. The bidirectional hydraulic damping energy absorbing typhoon-resistant mooring system according to claim 1 or 2, characterized in that: The upper row of rollers is provided with three rollers.

5. The bidirectional hydraulic damping energy absorbing typhoon-resistant mooring system according to claim 1 or 2, characterized in that: The lower row of rollers is provided with four rollers.

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