Vortex-induced oscillation suppression device and ship berth system

Abstract

The invention discloses a vortex-induced oscillation suppression device and a ship berth system, and the device comprises a sheath which is used for sleeving a mooring cable; the multiple spiral strakes are arranged on the outer surface of the sheath and are sequentially arranged in the circumferential direction of the sheath; each spiral strake comprises a plurality of segmented structures, and the segmented structures are sequentially arranged at intervals in the axial direction of the sheath; the segmented structure comprises a rectangular structure part, the cross section of which is rectangular along the radial direction of the sheath; the back flow side of the rectangular structure part is attached to the sheath; the radial section of the triangular structure part along the sheath is triangular, and one side of the triangle is attached to the incident flow side of the rectangular structure part, so that for the overall structure of the spiral strake, the incident flow side is of a sharp edge structure, asymmetric disturbance is artificially introduced, periodic vortex formation is destroyed, the incident flow contact area is effectively reduced, fluid separation points are dispersed, and the flow separation effect is improved; the fluid resistance is reduced, and the overall turbulent flow is enhanced, so that the aim of improving the vortex-induced oscillation suppression effect is fulfilled.

Description

Technical Field

[0001] This application relates to the field of ship berth system technology, and in particular to a vortex-induced oscillation suppression device and a ship berth system. Background Technology

[0002] Mooring cables, as key connecting components in deep-water marine engineering, are widely used in mooring systems for floating structures such as deep-water oil drilling platforms and floating wind power platforms. They play a crucial role in stabilizing the floating body on the seabed and ensuring the safe and stable operation of the structure in complex marine environments. As a typical flexible columnar structure, mooring cables are prone to vortex-induced vibrations under the influence of ocean currents. Especially when the vortex shedding frequency is close to the cable's natural frequency, resonance can easily occur, leading to large-amplitude periodic vibrations. This can cause material fatigue damage, and even cable breakage, endangering the overall safety of the project and causing significant economic losses.

[0003] Currently, a common method to reduce vortex-induced vibration is to add specific geometric structures to the cable surface to disrupt the synchronicity of vortex shedding and reduce vibration amplitude. Among these methods, helical plate structures have been widely used in various marine mooring systems due to their simple structure, strong adaptability, and significant vibration reduction effect. However, most existing helical plate structures use rectangular cross-sections, which result in a large flow-facing area and poor fluid flow characteristics, leaving room for improvement in vibration reduction performance. Further optimization and improvement are urgently needed.

[0004] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0005] The technical problem to be solved by this application is to provide a vortex-induced oscillation suppression device and a ship berthing system to address the above-mentioned deficiencies of the prior art, thereby improving the vortex-induced oscillation suppression effect.

[0006] The technical solution adopted by this application to solve the technical problem is as follows: A vortex-induced oscillation suppression device, comprising: Sheath, used to be fitted over the mooring cable; Multiple spiral plates are disposed on the outer surface of the sheath and arranged sequentially along the circumference of the sheath; each spiral plate includes multiple segmented structures, which are arranged at intervals along the axial direction of the sheath. The segmented structure includes: The rectangular structure has a rectangular cross-section along the radial direction of the sheath; the backflow of the rectangular structure... The side is fitted to the sheath; The triangular structure has a triangular cross-section along the radial direction of the sheath; and one side of the triangle is in contact with the frontal side of the rectangular structure.

[0007] The vortex-induced oscillation suppression device, wherein the inflow side of the triangular structure part is provided with a plurality of slotted grooves, and the plurality of slotted grooves are arranged in sequence along the spiral extension direction of the triangular structure part to form triangular sawteeth between adjacent two slotted grooves.

[0008] The vortex-induced oscillation suppression device, wherein along the spiral extension direction, the length of the triangular sawteeth is equal to the length of the slotted grooves.

[0009] The vortex-induced oscillation suppression device, wherein the triangle is an equilateral triangle.

[0010] The vortex-induced oscillation suppression device, wherein the thickness of the rectangular structure part is equal to the length of the side of the equilateral triangle.

[0011] The vortex-induced oscillation suppression device, wherein the ratio of the axial length of the sheath to the diameter of the mooring cable is 8:1~15:1.

[0012] The vortex-induced oscillation suppression device, wherein the ratio of the height of the segmented structure protruding relative to the surface of the sheath to the diameter of the mooring cable is 1:10.

[0013] The vortex-induced oscillation suppression device, wherein the spiral column plate is at least 3, and a plurality of spiral column plates are uniformly distributed along the circumference of the sheath.

[0014] The vortex-induced oscillation suppression device, wherein the sheath comprises: two half-circular bodies; when the two half-circular bodies are spliced, a circular receiving space is formed; the circular receiving space is matched with the mooring cable; an assembly part provided at both ends of the half-circular body and having a mounting hole; a connecting part which is detachably matched with the mounting hole to connect the two half-circular bodies.

[0015] A ship berth system comprising the vortex-induced oscillation suppression device according to any one of the above, further comprising a mooring cable; the vortex-induced oscillation suppression device is sleeved outside the mooring cable.

[0016] Beneficial effects: the cross section of the rectangular structure along the radial direction of the sheath is rectangular, so that one side of the back flow side of the rectangular structure is in contact with the sheath, which can provide stable support by providing a larger contact area, and facilitate the use of bolts, adhesion or clamping groove and other ways to fix the rectangular structure on the sheath; the one side of the flow side of the rectangular structure is a plane. The cross section of the triangular structure along the radial direction of the sheath is triangular, and one side of the triangle is in contact with the rectangular structure, so that the back flow side of the triangular structure is a plane structure, and the one side of the triangular structure and the rectangular structure is a plane structure, thereby increasing the contact area between the triangular structure and the rectangular structure and improving the stability of the connection between the triangular structure and the rectangular structure; and the flow side of the triangular structure is an acute edge structure, so that the area of the flow side of the spiral plate directly contacting the fluid is effectively reduced, the fluid separation point is dispersed, which is beneficial to reduce the fluid resistance and enhance the overall flow disturbance, thereby achieving the purpose of improving the vortex oscillation suppression effect.

[0017] At the same time, the spiral plate is segmented by a plurality of segmented structures, and is not continuous, and there is a disturbance gap between adjacent segmented structures, which effectively breaks the periodic synchronous vibration and reduces the overall resonance risk. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the first view of the assembly structure of the vortex oscillation suppression device and the mooring cable in the present application; Figure 2 is the second view of the assembly structure of the vortex oscillation suppression device and the mooring cable in the present application; Figure 3 is Figure 2 is a local enlarged structure schematic view of A in the present application; Figure 4 is a structure schematic view of the segmented structure in the present application; Figure 5 is a structure schematic view of the sheath in the present application. DETAILED DESCRIPTION

[0019] It will be understood by those within the art that, in this disclosure, terms such as "a," "an," and "the" are not intended to exclude particular embodiments or amounts of what is claimed and / or to refer to only a singular entity but instead can be understood to be followed by "at least one," "one or more" or "one or more than one." It is further understood that, in this disclosure, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It will be understood by those within the art that, in this disclosure, the term "includes" means "comprises" or is "comprised of" and the term "comprising" means "including" or "containing." It will be further understood that, in this disclosure, the terms "includes" and / or "comprising" do not exclude the presence of additional items or additional elements. It will be understood by those within the art that, in this disclosure, the term "coupled" is used herein to refer to the direct or indirect coupling between or among two or more elements, whether mechanical, electrical, or otherwise, unless otherwise indicated. It will be further understood that, in this disclosure, the term "coupled" can refer to an absence of coupling so long as the two or more elements are not in contact with each other. It will be further understood that the terms "connected," "coupled," and / or "in communication with," used in the disclosure, can mean the direct connection or coupling between or among two or more elements, or can mean an indirect connection or coupling between or among two or more elements.

[0020] Those skilled in the art will appreciate that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0021] As a key connecting component in deepwater marine engineering, mooring lines are widely used in the mooring system of floating structures such as deepwater oil drilling platforms and floating wind power platforms, and play an important role in stabilizing the floating body on the seabed and ensuring the safe and stable operation of the structure in complex marine environments. As a typical flexible column structure, mooring lines are prone to vortex-induced vibration under the action of ocean currents. Especially when the vortex shedding frequency is close to the natural frequency of the cable, resonance phenomenon is easily induced, resulting in large periodic vibration, and further causing material fatigue damage, and even leading to cable rupture, endangering the overall engineering safety and causing significant economic losses.

[0022] The inventors have found that, at present, the common method for reducing vortex-induced vibration is to attach a specific geometric structure to the surface of the cable to disrupt the synchronization of vortex shedding and reduce the vibration amplitude. Among them, the helical strake has been widely used in various marine mooring systems due to its simple structure, strong adaptability and obvious vibration reduction effect. However, the existing helical strake structure adopts a rectangular cross-section, i.e., the cross-section of the helical strake along the radial direction of the mooring line is rectangular, so the backflow side and the flow-approaching side of the helical strake are both helical planar structures, making the flow-approaching area of the structure large and the flow characteristics of the fluid poor, resulting in a large drag force, and thus the vibration reduction effect still needs to be improved and further optimized.

[0023] To solve the above technical problems, the present application provides a vortex-induced oscillation suppression device, as shown in Figure 1 andFigure 2 As shown in the drawings, the vortex-induced oscillation suppression device comprises a sheath 1 and a plurality of helical plates 2; the sheath 1 is used to be sleeved on the mooring cable 100; the plurality of helical plates 2 are arranged on the outer surface of the sheath 1 and are arranged in sequence along the circumferential direction of the sheath 1; each helical plate 2 comprises a plurality of segmented structures 3 which are arranged in sequence and spaced along the axial direction of the sheath 1. Figure 3 And Figure 4 As shown in the drawings, the segmented structure 3 comprises a rectangular structure part 31 and a triangular structure part 32; the rectangular structure part 31 is rectangular in the radial cross section of the sheath 1; the back flow side of the rectangular structure part 31 is attached to the sheath 1; the triangular structure part 32 is triangular in the radial cross section of the sheath 1; and one side of the triangle is attached to the flow side of the rectangular structure part 31.

[0024] The sheath 1 is used to position and support the helical plate 2, and is used to be sleeved on the mooring cable 100, so that the helical plate 2 can be arranged on the periphery of the mooring cable 100, thereby changing the flow pattern of the fluid around the mooring cable 100 through the passive design of the vortex-induced oscillation suppression device on the surface of the mooring cable 100 without external control system or energy support, only relying on the structure design of the vortex-induced oscillation suppression device to change the flow pattern of the fluid around the mooring cable 100, so that the generation and separation of vortex no longer have regularity, the periodic vortex-induced load is reduced, thereby reducing the amplitude of vibration, achieving the suppression of vortex-induced oscillation, achieving the effect of vibration reduction, thus having higher reliability, especially suitable for the mooring cable 100 which is immersed in the marine environment for a long time.

[0025] Specifically, the helical plate 2 is arranged in a helical shape along the axial direction of the sheath 1; the helical plate 2 is a plurality of helical plates 2 which are arranged in sequence along the circumferential direction of the sheath 1, thereby disturbing the flow on the periphery of the sheath 1. The helical plate 2 comprises a plurality of segmented structures 3 which are arranged in a helical shape as a whole and are arranged in sequence and spaced along the axial direction of the sheath 1. That is, the helical plate 2 is not a continuous helical structure, but comprises a plurality of segmented structures 3 which are arranged in sequence and separated from each other, thereby forming a helical structure in the overall appearance.

[0026] The segmented structure 3 comprises the rectangular structure part 31 and the triangular structure part 32; the back flow side of the rectangular structure part 31 is attached to the sheath 1, and the flow side of the rectangular structure part 31 is attached to the triangular structure part 32, so that the rectangular structure part 31 is placed between the triangular structure part 32 and the sheath 1, and the triangular structure part 32 is located on the flow side of the rectangular structure part 31. The cross section of the rectangular structure part 31 along the radial direction of the sheath 1 is rectangular, so that one side of the back flow side of the rectangular structure part 31 is a plane and is attached to the sheath 1, which can provide stable support by providing a larger contact area, and facilitate the use of bolts, adhesion or clamping groove to fix the rectangular structure part 31 on the sheath 1; the flow side of the rectangular structure part 31 is also a plane. The cross section of the triangular structure part 32 along the radial direction of the sheath 1 is triangular, and one side of the triangular structure part 32 is attached to the rectangular structure part 31, so that the back flow side of the triangular structure part 32 is a plane structure, and the side of the triangular structure part 32 and the rectangular structure part 31 is a plane structure, thereby increasing the contact area between the triangular structure part 32 and the rectangular structure part 31 and improving the stability of the connection between the triangular structure part 32 and the rectangular structure part 31; and the flow side of the triangular structure part 32 is an acute edge structure, so that the area of the flow side of the helical plate 2 directly contacting the fluid is effectively reduced, the fluid separation point is dispersed, which is beneficial to reduce the fluid resistance and enhance the overall disturbance, thereby achieving the purpose of improving the vortex oscillation suppression effect.

[0027] In the present application, the rectangular structure part 31 and the triangular structure part 32 are combined to form the segmented structure 3, and a plurality of segmented structures 3 form the helical plate 2, so that for the overall structure of the helical plate 2, the back flow side attached to the sheath 1 is a plane structure, and the flow side away from the sheath 1 is an acute edge structure, which artificially introduces asymmetric disturbance, destroys the periodic vortex formation, disperses the energy concentration area, ensures the stability of the positioning of the helical plate 2 on the sheath 1, and effectively reduces the area of the helical plate 2 directly contacting the fluid, disperses the fluid separation point, which is beneficial to reduce the fluid resistance and enhance the overall disturbance, thereby achieving the purpose of improving the vortex oscillation suppression effect.

[0028] At the same time, the helical plate 2 is segmented and arranged by a plurality of segmented structures 3, and is not continuous, and there is a disturbance gap between adjacent segmented structures 3, which effectively breaks the periodic synchronous vibration and reduces the overall resonance risk.

[0029] In an embodiment of the present application, the length of the helical row plate 2 along the axial direction of the sheath 1 is equal to the axial length of the sheath 1, that is, the helical row plate 2 covers the entire length of the sheath 1, so that the surface turbulence state of the entire mooring cable 100 is consistent, the flow field stability is higher, the energy distribution is uniform, and the risk of fracture caused by local high-amplitude vibration is reduced. At the same time, under the action of the helical row plate 2, the mooring cable 100 flow field generates a spiral flow pattern. If the helical row plate 2 is arranged only in part of the sheath 1, the spiral flow is easy to be broken, leading to turbulence reconstruction and complex flow field; and the helical row plate 2 covers the entire length of the sheath 1, the spiral flow is continuous along the axial direction, the flow field is more controllable, the excitation frequency is more dispersed, and local instability is effectively avoided, thereby improving the overall fluid dynamic performance.

[0030] In an embodiment of the present application, as shown in Figure 3 and Figure 4 The inflow side of the triangular structure part 32 is provided with a plurality of grooves 33, which are arranged in sequence along the spiral extension direction of the triangular structure part 32 to form triangular sawteeth between adjacent two grooves 33.

[0031] Specifically, the grooves 33 are arranged on the inflow side of the triangular structure part 32, thereby forming a plurality of triangular sawtooth structures on the inflow side of the triangular structure part 32. The triangular sawteeth form fine-scale disturbance sources on the inflow side surface, which promotes the early generation of a plurality of local small-scale vortex clusters in the main vortex formation area. These small-scale disturbances disrupt the orderliness and synchronicity of the large-scale vortex shedding, change the overall vortex shedding pattern of the cable flow field; due to the intervention of small-scale vortex clusters, a complex multi-scale vortex structure is formed in the cable flow field, the overall flow field becomes more turbulent, the energy is dispersed among different scale vortices, the formation of periodic large-scale vortex streets is inhibited, and the amplitude of vortex-induced vibration is significantly reduced. Through this way, the fluid vibration energy can be effectively dispersed, the large-amplitude periodic vortex-induced vibration can be weakened, the cable transverse amplitude can be reduced, and the anti-vortex-induced vibration performance of the mooring cable 100 can be significantly improved.

[0032] At the same time, the triangular sawtooth structure is simple in shape, easy to process and form, and easy to install, and has good adaptability to different flow velocity ranges, which can effectively prolong the fatigue life of the mooring cable 100, improve the overall service reliability, and is suitable for mooring systems in complex marine environments such as deep-sea floating wind power and deep-water oil and gas platforms.

[0033] In an embodiment of the present application, the rectangular structure part 31 and the triangular structure part 32 are integrally formed to improve the strength of the segmented structure 3. Moreover, the rectangular structure part 31 and the triangular structure part 32 are both solid structures to ensure the durability of the segmented structure 3.

[0034] In an embodiment of the present application, the length of the triangular serration is equal to the length of the slot 33 along the direction of extension of the spiral.

[0035] Specifically, each adjacent two triangular serrations are separated by the slot 33; the length of the triangular serration is equal to the length of the slot 33 along the direction of extension of the spiral, and both are 1 / 17 of the length of the spiral column plate 2; the rhythm of adjacent slot 33 segments and serration segments is consistent, the spatial period of disturbance is consistent, and the slot 33 segment and the serration segment have equivalent effects on the main vortex area, forming a periodically changing local disturbance area on the upstream side of the spiral column plate 2, which is conducive to forming a stable and controllable vortex mode.

[0036] It can be seen that, in order to further improve the vortex-induced vibration resistance performance of the spiral column plate 2, a plurality of slots 33 with a length equal to that of the triangular serration are equidistantly arranged on the upstream side of the segmented structure 3, thereby forming a regular triangular serration structure. This design ensures the rhythm and symmetry of the slot 33 and the serration in the axial direction, makes the spatial period of disturbance consistent, promotes the formation of uniform and continuous small-scale vortexes on the surface of the fluid winding, effectively breaks the synchronization of large-scale vortex shedding, and realizes multi-scale energy dispersion of the flow field. In addition, the equal length design simplifies the manufacturing process, reduces the processing cost, improves the product consistency and performance stability, thereby significantly enhancing the vibration resistance and service reliability of the mooring cable 100.

[0037] In an embodiment of the present application, the triangular shape is an equilateral triangle, that is, the cross section of the triangular structure part 32 along the radial direction of the sheath 1 is an equilateral triangle.

[0038] Specifically, the equilateral triangle has relatively balanced advantages in terms of vortex effect, structural rationality, and manufacturing adaptability. Since one side of the equilateral triangle corresponds to the rectangular structure part, the upstream side of the equilateral triangle is a sharp corner with a fixed angle of 60°; compared with other angles (especially obtuse angles), the 60° sharp corner has stronger vortex capacity and can avoid the problem of local stress concentration caused by too small angle. At the same time, since the three sides of the equilateral triangle are equal, the equilateral triangle structure has good symmetry, which is convenient for modeling and manufacturing, and can realize uniform stress distribution under the action of the incoming flow, thereby improving the stability and durability of the overall structure.

[0039] In an embodiment of the present application, the thickness of the rectangular structure part 31 is equal to the length of the side of the equilateral triangle.

[0040] Specifically, in the embodiment, the thickness of the rectangular structure part 31 is equal to the length of the side of the equilateral triangle, so that along the thickness direction of the rectangular structure part 31, the two sides of the triangular structure part 32 are flush with the two sides of the rectangular structure part 31, ensuring that the structure is closely combined, easy to manufacture, and the flow field disturbance is continuous and stable, thereby improving the overall vortex-induced vibration performance and structural reliability.

[0041] In an embodiment of the present application, the ratio of the axial length of the sheath 1 to the diameter of the mooring cable 100 is in the range of 8:1 to 15:1.

[0042] Specifically, the characteristic length of vortex-induced vibration is usually related to the diameter of the mooring cable 100, and the diameter of the mooring cable 100 as the characteristic length determines the scale of the main vortex shedding. In the embodiment, the axial length of the sheath 1 is set to be much larger than the diameter of the mooring cable 100, which is conducive to setting the disturbance structure such as the helical row plate 2 to cover the surface of the mooring cable 100, and can ensure that the disturbance is continuous and stable and can continuously affect the flow field in a long axial range, forming a long enough disturbance area, effectively breaking the synchronous shedding of vortexes, and reducing the vibration amplitude.

[0043] In an embodiment of the present application, the ratio of the axial length of the sheath 1 to the diameter of the mooring cable 100 is 10:1.

[0044] Specifically, through many experiments and optimization verification by the inventor, the ratio of the axial length of the sheath 1 to the diameter of the mooring cable 100 is selected as 10:1, which can maintain good vortex-induced vibration resistance performance under different flow rates, effectively break the synchronous shedding of vortexes, and reduce the cable vibration amplitude. At the same time, this ratio takes into account the structure manufacturing cost and installation convenience on the basis of ensuring vibration suppression effect, and the overall performance is better than other ratio schemes, which is the best design parameter in terms of comprehensive performance.

[0045] In an embodiment of the present application, the ratio of the height of the segmented structure 3 protruding relative to the surface of the sheath 1 to the diameter of the mooring cable 100 is 1:10.

[0046] Specifically, if the height of the helical plate 2 is set too large, strong flow field separation is easily formed, additional resistance is generated, and even new irregular vibrations are excited; if the height of the helical plate 2 is set too small, the disturbance ability is insufficient, the large-scale vortex synchronous shedding cannot be effectively broken, and the anti-vibration effect is limited. Through experimental verification, when the ratio of the height of the segmented structure 3 protruding from the surface of the sheath 1 to the diameter of the mooring cable 100 is set to 1:10, sufficient disturbance amplitude can be formed in the circumferential range of the mooring cable 100, which ensures the disturbance effect and does not significantly increase the flow area of the cable surface, thereby avoiding unnecessary flow resistance increase, reducing energy consumption increase or flow field disorder side effects.

[0047] In an embodiment of the present application, the helical plate 2 is at least 3, and a plurality of helical plates 2 are uniformly distributed along the circumference of the sheath 1.

[0048] Specifically, the essence of vortex-induced vibration is that the vortex around the cable synchronously sheds in a certain angular direction; if only two helical plates 2 are arranged, the disturbance direction is fixed due to the symmetrical arrangement, only part of the vortex can be disturbed, and left-right symmetrical main vortex regions are still easily formed, so the vortex-induced vibration cannot be effectively suppressed. Therefore, in the present embodiment, the helical plate 2 is three or more, and all the helical plates 2 are uniformly distributed along the circumferential direction of the sheath 1, which can uniformly disturb the flow field around the cable in multiple angular directions, effectively destroy the formation of vortex-induced vibration, and significantly improve the anti-vibration performance.

[0049] In an embodiment of the present application, the helical plate 2 is four, and the four helical plates 2 are uniformly distributed in the circumferential direction of the sheath 1. Compared with three helical plates 2, arranging four helical plates 2 in the present embodiment makes the fourth helical plate 2 serve as a backup element in extreme working conditions and considering safety redundancy design. Even if one of the helical plates 2 has a large manufacturing error or is damaged, three helical plates 2 can still maintain the disturbance ability.

[0050] At the same time, the design of four helical plates 2 has good processing and installation convenience; the four helical plates 2 are uniformly and symmetrically distributed, which can simplify the processing and positioning requirements, avoid complex angle calculation, and easily realize standardized module production in the manufacturing process; and when installed, the symmetry principle is followed, which greatly improves the construction efficiency, reduces the manual error, ensures the symmetry and stability of the helical plate 2 and the sheath, and is beneficial to realizing high consistency and high reliability in large-scale engineering applications.

[0051] In an embodiment of the present application, as shown in FIG. 1, the segmented structure 3 is arranged on the outer surface of the sheath 1, and the segmented structure 3 is a helical plate 2. Figure 5As shown, the sheath 1 comprises two semicircular bodies 11, an assembly piece 12 and a connecting piece (not shown in the figure); when the two semicircular bodies 11 are spliced together, a circular receiving space is formed; the circular receiving space is matched with the mooring cable 100; the assembly piece 12 is arranged at both ends of the semicircular body 11 and has a mounting hole; and the connecting piece is detachably matched with the mounting hole to connect the two semicircular bodies 11.

[0052] Specifically, the sheath 1 does not adopt an integral structure, but adopts a split structure of two semicircular bodies 11; the assembly piece 12 is arranged at both axial ends of each semicircular body 11, and the mounting hole is arranged on the assembly piece 12; thus, when the two semicircular bodies 11 are spliced together, the corresponding assembly pieces 12 can be matched with each other, so that the connecting piece can pass through the corresponding mounting holes of the two semicircular bodies 11 in sequence, thereby positioning the two semicircular bodies 11 in the spliced state.

[0053] In the present application, the sheath 1 adopts a split structure, can be wrapped from both sides of the mooring cable 100, and is positioned outside the mooring cable 100 by matching the connecting piece with the mounting hole, thereby achieving stable installation. The sheath 1 is designed as a detachable structure, which is convenient for on-site installation and replacement, and can be modularly expanded according to requirements to be suitable for mooring cables 100 of different sizes.

[0054] In an embodiment of the present application, the ratio of the spacing between adjacent two segmented structures 3 in the spiral row plate 2 to the length of the segmented structure 3 in the spiral extension direction is 1:3.

[0055] Specifically, the segmented structure 3 in the spiral row plate 2 is evenly divided into 10 segments along the axial direction of the sheath 1, and the ratio of the spacing between adjacent two segmented structures 3 to the length of the segmented structure 3 in the spiral extension direction is 1:3, thereby reducing the flow area of the spiral row plate 2 and effectively reducing the overall drag. At the same time, the tooth-shaped edge formed after cutting can excite local small-scale vortices when the fluid passes through, and these vortices promote the mixing of the main flow and the near-wall fluid, delay the separation of the fluid, reduce the pressure difference in the trailing edge region, further reduce the overall resistance, and improve the anti-vibration performance and fluid mechanics efficiency.

[0056] In an embodiment of the present application, the sheath 1 is a carbon fiber reinforced polymer sheath, that is, the sheath 1 is made of carbon fiber reinforced polymer material, so that it has the advantages of light weight, high strength and excellent corrosion resistance, can work stably for a long time in high-humidity and high-salt working conditions such as marine environment, and significantly improves the overall durability and service life of the sheath 1.

[0057] The application also provides a ship berth system, which comprises the vortex-induced oscillation suppression device according to any one of the above, and further comprises a mooring cable 100; the vortex-induced oscillation suppression device is sleeved outside the mooring cable 100, in particular, the sheath 1 is sleeved outside the mooring cable 100, and the inner wall of the sheath 1 is attached to the mooring cable 100, so as to reduce or even avoid the displacement and oscillation of the sheath 1 relative to the mooring cable.

[0058] In summary, the application provides a vortex-induced oscillation suppression device and a ship berth system, which comprises a sheath for sleeving outside a mooring cable, a plurality of spiral row plates arranged on the outer surface of the sheath and sequentially arranged along the circumference of the sheath, each spiral row plate comprising a plurality of segmented structures sequentially and spacedly arranged along the axial direction of the sheath, the segmented structure comprising a rectangular structure part with a rectangular radial cross section of the sheath, the back flow side of the rectangular structure part being attached to the sheath, and a triangular structure part with a triangular radial cross section of the sheath, one side of the triangular structure part being attached to the flow side of the rectangular structure part. In the application, the rectangular structure part and the triangular structure part are combined to form the segmented structure, and the spiral row plate is formed by a plurality of segmented structures, so that for the overall structure of the spiral row plate, the back flow side attached to the sheath is a planar structure, and the flow side away from the sheath is an acute edge structure, which artificially introduces asymmetric disturbance, destroys the periodic vortex formation, disperses the energy concentration area, ensures the stability of the positioning of the spiral row plate on the sheath, effectively reduces the area of the spiral row plate directly contacting the fluid, disperses the fluid separation point, is beneficial to reducing the fluid resistance, enhances the overall disturbance, and thus achieves the purpose of improving the vortex-induced oscillation suppression effect. At the same time, the spiral row plate is segmented and arranged by a plurality of segmented structures, and is not continuous, and there is a disturbance gap between adjacent segmented structures, which effectively breaks the periodic synchronous vibration and reduces the overall resonance risk.

[0059] It should be understood that the application of the application is not limited to the above examples, and can be improved or changed according to the above description by those skilled in the art, and all these improvements and changes shall belong to the protection scope of the claims attached to the application.

Claims

1. A vortex-induced oscillation suppression device, characterized in that, It includes: Sheath, used to be fitted over the mooring cable; Multiple spiral plates are disposed on the outer surface of the sheath and arranged sequentially along the circumference of the sheath; each spiral plate includes multiple segmented structures, which are arranged at intervals along the axial direction of the sheath. The segmented structure includes: The rectangular structure has a rectangular cross-section along the radial direction of the sheath; the backflow side of the rectangular structure is in contact with the sheath. The triangular structure has a triangular cross-section along the radial direction of the sheath; and one side of the triangle is in contact with the frontal side of the rectangular structure.

2. The vortex-induced oscillation suppression device according to claim 1, characterized in that, The triangular structure has multiple slots on its front side, and these slots are arranged at intervals along the spiral extension direction of the triangular structure to form triangular serrations between adjacent slots.

3. The vortex-induced oscillation suppression device according to claim 2, characterized in that, Along the spiral extension direction, the length of the triangular saw teeth is equal to the length of the slot.

4. The vortex-induced oscillation suppression device according to claim 1, characterized in that, The triangle is an equilateral triangle.

5. The vortex-induced oscillation suppression device according to claim 4, characterized in that, The thickness of the rectangular structure is equal to the side length of the equilateral triangle.

6. The vortex-induced oscillation suppression device according to claim 1, characterized in that, The ratio of the axial length of the sheath to the diameter of the mooring cable is in the range of 8:1 to 15:

1.

7. The vortex-induced oscillation suppression device according to claim 1, characterized in that, The ratio of the height of the segmented structure protruding from the sheath surface to the diameter of the mooring cable is 1:

10.

8. The vortex-induced oscillation suppression device according to claim 1, characterized in that, The spiral plates are at least three in number, and the spiral plates are evenly distributed along the circumference of the sheath.

9. The vortex-induced oscillation suppression device according to claim 1, characterized in that, The sheath includes: Two semi-circular bodies; when the two semi-circular bodies are joined together, they form a circular receiving space; the circular receiving space cooperates with the mooring cable; The fittings are located at both ends of the semi-circular body and have mounting holes; A connector, which detachably engages with the mounting hole, to connect the two semicircular bodies.

10. A ship berth system, characterized in that, It includes the vortex-induced oscillation suppression device as described in any one of claims 1-9, and further includes a mooring cable; the vortex-induced oscillation suppression device is sleeved on the outside of the mooring cable.

Images