A serrated damping device for a barrel shaped hull
By designing a sawtooth damping device on a cylindrical FPSO, including a rotating housing and a toothed housing, the problem of poor suppression of heave motion by traditional damping devices is solved, and the effects of enhanced motion damping, improved stability and lower center of gravity are achieved.
Patent Information
- Application Number
- CN202211463342.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-11-22
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2042-11-22
AI Technical Summary
Traditional damping devices have limited effectiveness in suppressing the heave motion of cylindrical FPSOs, necessitating the development of novel damping devices to enhance motion damping.
The device employs a sawtooth-shaped damping system, comprising a slewing box and a toothed box. The inner side of the slewing box is connected to the cylindrical hull, and the inner side of the toothed box is connected to the outer side of the slewing box. The welding strength between the toothed box and the slewing box is lower than the welding strength between the slewing box and the cylindrical hull. The inner side of the toothed box is an empty compartment, while the inner side of the slewing box forms a ballast tank.
The increased motion damping of the cylindrical FPSO reduces the amplitude of heave motion, improves stability and motion performance, lowers the center of gravity, prevents marine organism growth and corrosion, simplifies ballast control, and reduces structural fatigue.
Smart Images
Figure CN116118957B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of ocean engineering, in particular to a zigzag damping device applied to a cylindrical FPSO. BACKGROUND
[0002] FPSO (Floating Production Storage and Offloading) is the mainstream production device for global offshore oil and gas development. Conventional FPSO is in the form of a ship, and needs to rely on a single-point mooring system for positioning when operating in harsh sea areas, which is relatively expensive. Cylindrical FPSO has structural isotropy, strong resistance to harsh sea conditions, and does not need single-point mooring. It has the characteristics of simple construction and installation, small engineering investment, etc., and its application proportion in offshore oil and gas development has gradually increased in recent years.
[0003] The large waterplane characteristics of the cylindrical FPSO result in large heave motion, and the damping plate is one of the important structures for improving its motion performance. The traditional damping device is a single horizontal thick plate or a rotating box structure, which has limited inhibitory effect on heave motion, and a new type of damping device needs to be developed to enhance the damping inhibitory effect on the motion of the cylindrical FPSO. SUMMARY
[0004] In view of the above problems, the purpose of the present application is to provide a zigzag damping device applied to a cylindrical FPSO, which can increase the overall motion damping of the cylindrical FPSO, thereby reducing the motion response amplitude.
[0005] To achieve the above purpose, the present application adopts the following technical solutions:
[0006] A zigzag damping device for a cylindrical hull, comprising a damping box body connected to the cylindrical hull, the damping box body comprising:
[0007] a rotating box body, an inner surface of the rotating box body being welded to an outer peripheral surface of the cylindrical hull; and
[0008] a tooth-shaped box body, an inner surface of the tooth-shaped box body being welded to an outer peripheral surface of the rotating box body, the welding strength between the inner surface of the tooth-shaped box body and the outer peripheral surface of the rotating box body being lower than the welding strength between the inner surface of the rotating box body and the outer peripheral surface of the cylindrical hull.
[0009] The rotating box body comprises a rotating box body cavity surrounded by a rotating box body upper shell plate, a rotating box body lower shell plate, a rotating box body inner shell plate, a rotating box body outer shell plate and a rotating box body side shell plate.
[0010] The upper shell plate of the rotating box body comprises a stepped first upper shell plate and a second upper shell plate, the second upper shell plate is arranged in parallel with the lower shell plate of the rotating box body, the first upper shell plate is inclined and extends upward at an angle with the second upper shell plate, one end of the first upper shell plate is connected with the second upper shell plate, and the other end of the first upper shell plate is connected with the inner shell plate of the rotating box body.
[0011] The tooth-shaped box body comprises a sealed tooth-shaped box cavity enclosed by a tooth-shaped box upper shell plate, a tooth-shaped box lower shell plate, a tooth-shaped box inner shell plate, a tooth-shaped box outer shell plate and a tooth-shaped box side shell plate.
[0012] The height of the tooth-shaped box inner shell plate is the same as that of the rotating box outer shell plate, so that the tooth-shaped box inner shell plate and the rotating box outer shell plate are connected by welding, and the curvature of the tooth-shaped box inner shell plate is the same as that of the rotating box outer shell plate, so that the tooth-shaped box inner shell plate and the rotating box outer shell plate are connected by welding.
[0013] The rotating box cavity and the tooth-shaped box cavity are independent and not communicated with each other.
[0014] The rotating box body is internally formed with a ballast tank, and a through hole is arranged at the connecting position between the rotating box body and the cylindrical ship body, so that the ballast tank of the rotating box body is communicated with the ballast tank of the cylindrical ship.
[0015] The tooth-shaped box body is a closed shell plate structure, is not communicated with seawater, and is not loaded with ballast water.
[0016] The horizontal section of the tooth-shaped box body is an arc edge trapezoid or an arc edge triangle.
[0017] The cylindrical ship body is a cylindrical floating production storage and offloading device.
[0018] The present application has the following advantages due to the above technical scheme:
[0019] 1. The damping box body is composed of a rotating box body and a tooth-shaped box body, the tooth-shaped box body effectively increases the contact area with water, increases the fluid viscosity effect such as vortex shedding, effectively increases the motion damping of the cylindrical FPSO, reduces the heave motion amplitude, and is beneficial to the mooring and riser arrangement of the cylindrical FPSO.
[0020] 2. The rotating box body is internally formed with a ballast tank, effectively increases the ballast tank capacity of the cylindrical FPSO, reduces the gravity center of the whole ship, increases the stability, and improves the motion performance. The internal ballast tank of the rotating box body can be communicated with the internal ballast tank of the cylindrical ship body, simplifies the pipelines, valves and the like related to ballast, and is convenient for ballast control.
[0021] 3. Multiple tooth-shaped box bodies are the same in shape, which is convenient for batch construction and installation.
[0022] 4. The horizontal section of the tooth-shaped box is arc-ed trapezoid or arc-ed triangle, which is beneficial to the force transmission between the tooth-shaped box and the rotating box and reduces the structural fatigue caused by local stress concentration.
[0023] 5. The tooth-shaped box is a closed shell structure and is not connected with seawater, which avoids the growth of marine organisms on the inside and slows down the corrosion rate of the ship body, facilitating the daily operation and maintenance during service.
[0024] 6. The tooth-shaped box is empty inside and does not load ballast water, which simplifies the internal arrangement of the tooth-shaped box and does not need to open holes to arrange the ballast pipeline, which is beneficial to the structural integrity.
[0025] 7. The tooth-shaped box and the rotating box are independent of each other, and the welding strength between the tooth-shaped box and the rotating box is lower than that between the rotating box and the cylindrical ship body, so that the damage or falling of a single or multiple tooth-shaped boxes will not have a great impact on the stability and safety of the cylindrical FPSO. BRIEF DESCRIPTION OF DRAWINGS
[0026] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not intended to limit the scope of the application. Throughout the drawings, same reference numerals are used for same components. In the drawings:
[0027] Figure 1 is a three-dimensional schematic view of the cylindrical FPSO;
[0028] Figure 2 is a bottom surface schematic view of the cylindrical FPSO;
[0029] Figure 3 is a damping box A-A section schematic view of the cylindrical FPSO;
[0030] Figure 4 is a tooth-shaped box horizontal section schematic view of the cylindrical FPSO.
[0031] The various signs in the drawings represent the following:
[0032] 1. Cylindrical ship body; 2. Damping box;
[0033] 21. Rotating box; 211. Rotating box upper shell plate; 212. Rotating box lower shell plate; 213. Rotating box inner shell plate; 214. Rotating box outer shell plate;
[0034] 22. Tooth-shaped box; 221. Tooth-shaped box upper shell plate; 222. Tooth-shaped box lower shell plate; 223. Tooth-shaped box inner shell plate; 224. Tooth-shaped box outer shell plate; 225. Tooth-shaped box side shell plate. DETAILED DESCRIPTION
[0035] Exemplary embodiments of the present application will be described herein below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it is to be understood that the present application can be embodied in various forms without being limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.
[0036] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.
[0037] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the systems or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and the like are used to distinguish parts, and have no special meaning unless otherwise stated. The above terms cannot be understood as indicating or implying relative importance.
[0038] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be a fixed connection, or a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0039] As shown in Figures 1-4 An embodiment of the present application provides a zigzag damping device applied to a cylindrical FPSO, which includes a cylindrical hull 1 and three damping box bodies 2.
[0040] The three damping box bodies 2 are arranged at the bottom of the side of the cylindrical hull 1 at equal intervals, so as to facilitate the arrangement of mooring-related equipment between the damping box bodies.
[0041] As shown in Figure 1 The three damping box bodies 2 are welded on the outer peripheral surface of the cylindrical hull 1 at equal intervals. The number of damping box bodies 2 is not limited to three, and can be multiple.
[0042] Each damping housing 2 includes a rotating housing 21 and multiple toothed housings 22.
[0043] The slewing box 21 is a rotating body coaxial with the cylindrical hull and has a shell plate structure. Specifically, it includes an upper shell plate 211, a lower shell plate 212, an inner shell plate 213, an outer shell plate 214, and a side shell plate 215. The slewing box 21 can be a closed structure, with the upper shell plate 211, lower shell plate 212, inner shell plate 213, outer shell plate 214, and side shell plate 215 forming a sealed cavity.
[0044] The inner shell plate 213 of the rotating box is higher than the outer shell plate 214 of the rotating box, which facilitates the connection between the rotating box 21 and the shell plate cylindrical hull 1 and reduces structural fatigue caused by stress concentration.
[0045] In some embodiments, the upper shell plate 211 of the rotating housing comprises two stepped parts: a first upper shell plate 211-1 and a second upper shell plate 211-2. The second upper shell plate 211-2 is arranged parallel to the lower shell plate 212 of the rotating housing, and the first upper shell plate 211-1 and the second upper shell plate 211-2 extend upward at an angle. One end of the first upper shell plate 211-1 is connected to the second upper shell plate 211-2, and the other end of the first upper shell plate 211-1 is connected to the upper edge of the inner shell plate 213 of the rotating housing.
[0046] The interior of the slewing hull 21 forms a ballast tank, which effectively increases the ballast tank capacity of the cylindrical FPSO, helps to lower the center of gravity of the entire ship, increases stability, and improves maneuverability.
[0047] The ballast tank formed inside the rotating box 21 can be connected to the ballast tank inside the cylindrical ship body through openings or other means, simplifying ballast-related pipelines and valves and facilitating ballast control.
[0048] Each of the multiple toothed boxes 22 is a closed shell structure, not connected to seawater, which prevents marine organisms from growing on the inside, slows down the corrosion rate of the hull, and facilitates daily operation and maintenance during service.
[0049] like Figure 1 and Figure 2 As shown, five toothed housings 22 are welded at equal intervals on each rotating housing 21. There can be multiple toothed housings 22, not limited to five.
[0050] Specifically, the tooth-shaped tank 22 comprises a tooth-shaped tank upper shell plate 221, a tooth-shaped tank lower shell plate 222, a tooth-shaped tank inner shell plate 223, a tooth-shaped tank outer shell plate 224, and a tooth-shaped tank side shell plate 225. In some embodiments, the tooth-shaped tank 22 is enclosed by the tooth-shaped tank upper shell plate 221, the tooth-shaped tank lower shell plate 222, the tooth-shaped tank inner shell plate 223, the tooth-shaped tank outer shell plate 224, and two tooth-shaped tank side shell plates 225 to form a sealed cavity.
[0051] The tooth-shaped tank 22 is empty inside and does not carry ballast water, which simplifies the internal arrangement of the tooth-shaped tank and eliminates the need for openings to arrange ballast pipelines, thereby facilitating the structural integrity.
[0052] The curvature and height of the tooth-shaped tank inner shell plate 223 correspond to those of the rotary tank outer shell plate 214. As shown in FIG. 2, the height of the tooth-shaped tank inner shell plate 223 is the same as that of the rotary tank outer shell plate 214, and the tooth-shaped tank inner shell plate 223 is connected to the rotary tank outer shell plate 214 by welding. Figure 3 As shown in FIG. 2, the height of the tooth-shaped tank inner shell plate 223 is the same as that of the rotary tank outer shell plate 214, and the tooth-shaped tank inner shell plate 223 is connected to the rotary tank outer shell plate 214 by welding. Figure 4 As shown in FIG. 2, the curvature of the tooth-shaped tank inner shell plate 223 is the same as that of the rotary tank outer shell plate 214, facilitating the connection of the tooth-shaped tank inner shell plate 223 to the rotary tank outer shell plate 214 by welding.
[0053] The tooth-shaped tank 22 has an arc-trapezoidal or arc-triangular horizontal cross-section, which facilitates the fixation of the tooth-shaped tank 22 to the outside of the rotary tank 21 by welding or other methods.
[0054] The included angle between the tooth-shaped tank side shell plate 225 and the tooth-shaped tank inner shell plate 223 is determined by numerical simulation optimization and is related to the arc length of the rotary tank outer shell plate 214. Generally, the included angle is between 30 and 90 degrees, which facilitates the smooth transmission of wave forces acting on the tooth-shaped tank 22 to the rotary tank 21, reduces fatigue stress, and ensures the service life of the tooth-shaped tank 22.
[0055] The height of the arc-trapezoidal or arc-triangular shape of the tooth-shaped tank 22 is determined by numerical simulation and comprehensive consideration of the radial length of the rotary tank lower shell plate 212, and is generally between 2 and 5 meters.
[0056] If the height of the arc-trapezoidal or arc-triangular shape is too small, the damping effect cannot be achieved and it is not easy to build.
[0057] If the height of the arc-trapezoidal or arc-triangular shape is too large, it will bear a large wave load, which is not conducive to the structural strength.
[0058] The plurality of tooth-shaped tanks 22 have the same shape and spacing, which facilitates batch construction and installation and makes the hydrodynamic performance more symmetrical.
[0059] The number of the tooth-shaped boxes 22 is related to the length of the arc edge of the outer shell plate 214 of the rotating box, the length of the arc edge of the trapezoidal or triangular arc of the shell plate, and the spacing of the tooth-shaped boxes 22, and is generally between 12 and 36.
[0060] The tooth-shaped box 22 and the rotating box 21 are independent of each other, and the welding strength between the tooth-shaped box 22 and the rotating box 21 is lower than the welding strength between the rotating box and the cylindrical hull.
[0061] The damage or falling of a single or multiple tooth-shaped boxes does not have a great impact on the stability and safety of the cylindrical FPSO.
[0062] As a specific embodiment of the zigzag damping device applied to the cylindrical FPSO, for a cylindrical hull with a diameter of 72 m, the typical dimensions of the zigzag damping device are as follows:
[0063] The radial length of the lower shell plate 212 of the rotating box is 9 m, the number of tooth-shaped boxes is 15, the horizontal cross section of the tooth-shaped box is a trapezoidal arc, the height of the trapezoidal arc is 4 m, the arc length is about 10 m, and the included angle between the side shell plate of the tooth-shaped box and the inner shell plate of the tooth-shaped box is 45 degrees.
[0064] The damping effect of the zigzag damping device provided by the application is improved by more than 10% compared with the damping effect of the traditional single rotating box structure, and the motion performance of the cylindrical FPSO is effectively improved.
[0065] According to some embodiments, a zigzag damping device applied to a cylindrical FPSO includes a cylindrical hull and three damping boxes. The three damping boxes are the same shape and are arranged at equal intervals on the side of the bottom of the cylindrical hull, facilitating the arrangement of mooring-related equipment between the damping boxes.
[0066] The damping box includes a rotating box and a plurality of tooth-shaped boxes. The rotating box and the tooth-shaped box are both shell plate structures and are independent of each other. The tooth-shaped boxes are fixed to the outer side of the rotating box by welding or other forms, and the welding strength is lower than that of the inner damping plate and the cylindrical hull. The plurality of tooth-shaped boxes are uniformly distributed at the same spacing.
[0067] The rotating box is a rotating body coaxial with the cylindrical hull, and the rotating cross section is a polygon with a high inner side and a low outer side, facilitating the connection of the rotating box and the hull. The rotating box forms a ballast tank inside, which can be communicated with the ballast tank inside the cylindrical hull.
[0068] The tooth-shaped boxes are the same shape, and the horizontal cross section is a trapezoidal arc or a triangular arc, and the vertical height is the same as the vertical height of the outer side of the rotating box, facilitating the connection with the rotating box.
[0069] The tooth-shaped box forms a closed air chamber inside, and does not need to be ballasted.
[0070] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; and although the present application has been described in detail with reference to the foregoing embodiments, it should be appreciated by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims
1. A zigzag damping device for a cylindrical hull, characterized in that it comprises a damping box connected to the cylindrical hull, the damping box comprising: a rotating box, the inner surface of which is welded to the outer peripheral surface of the cylindrical hull; and a zigzag box, the inner surface of which is welded to the outer peripheral surface of the rotating box, the welding strength between the inner surface of the zigzag box and the outer peripheral surface of the rotating box being lower than the welding strength between the inner surface of the rotating box and the outer peripheral surface of the cylindrical hull; the zigzag box comprises a sealed zigzag box cavity enclosed by a zigzag box upper shell plate, a zigzag box lower shell plate, a zigzag box inner shell plate, a zigzag box outer shell plate and a zigzag box side shell plate; the rotating box comprises a rotating box cavity enclosed by a rotating box upper shell plate, a rotating box lower shell plate, a rotating box inner shell plate, a rotating box outer shell plate and a rotating box side shell plate; the height of the zigzag box inner shell plate is the same as the height of the rotating box outer shell plate, so that the zigzag box inner shell plate and the rotating box outer shell plate are connected by welding, and the curvature of the zigzag box inner shell plate is the same as the curvature of the rotating box outer shell plate, so that the zigzag box inner shell plate and the rotating box outer shell plate are connected by welding; the rotating box cavity and the zigzag box cavity are independent of each other; a ballast tank is formed inside the rotating box, and a through hole is provided at the connection between the rotating box and the cylindrical hull to enable the ballast tank of the rotating box to communicate with the ballast tank of the cylindrical hull; a ballast tank is formed inside the rotating box, the capacity of the ballast tank of the cylindrical hull is increased, the center of gravity of the whole ship is lowered, the stability is increased, the motion performance is improved, the ballast tank inside the rotating box communicates with the ballast tank inside the cylindrical hull, and the ballast control is facilitated; the rotating box inner shell plate is higher than the rotating box outer shell plate, the rotating box is connected with the shell plate cylindrical hull, and the stress concentration caused by structural fatigue is reduced; the zigzag box is a closed shell structure, does not communicate with seawater, and does not load ballast water.
2. The zigzag damping device for a cylindrical hull according to claim 1, characterized in that: the rotating box upper shell plate comprises a stepped first upper shell plate and a second upper shell plate, the second upper shell plate is arranged in parallel with the rotating box lower shell plate, the first upper shell plate and the second upper shell plate are inclined at an angle and extend upward, one end of the first upper shell plate is connected with the second upper shell plate, and the other end of the first upper shell plate is connected with the rotating box inner shell plate.
3. The zigzag damping device for a cylindrical hull according to claim 1, characterized in that: the horizontal section of the zigzag box is an arc-edged trapezoid or an arc-edged triangle.
4. The zigzag damping device for a cylindrical hull according to claim 1, characterized in that: the cylindrical hull is a cylindrical floating production storage and offloading unit.