Asymmetric damping box optimal arrangement and design method based on limited construction conditions

Abstract

The invention relates to an asymmetric damping box optimal arrangement and design method based on limited construction conditions, which comprises the following steps of: 1, designing an asymmetric damping box occupation, 2, arranging a transition section of the asymmetric damping box, 3, arranging an annular bulkhead of the asymmetric damping box, 4, arranging a radial bulkhead of the asymmetric damping box, and 5, designing an asymmetric damping box. The method comprises the following steps: step 1, arranging asymmetric damping box stiffeners, step 2, arranging asymmetric damping box stiffeners, step 6, arranging asymmetric damping box sawteeth, step 7, arranging asymmetric damping box bulkhead holes, step 8, arranging asymmetric damping box toggle plates, and step 9, optimizing the structure of the asymmetric damping box. According to the damping box designed through the method, the heaving motion performance of the cylindrical floating facility can be improved, the problem that the damping box limits the construction scene of the cylindrical floating facility is solved, and meanwhile the problem that the local structure stress concentration of the connecting position of the damping box and the cylindrical floating facility body is obvious is solved; and the requirements of deep and far sea energy development can be better met.

Description

Technical Field

[0001] The invention relates to an optimized arrangement and design method of an asymmetric damping box based on restricted construction conditions, and belongs to the technical field of marine engineering. Background Art

[0002] In recent years, cylindrical floating structures have been widely used in deepwater energy development both domestically and internationally. As development demand increases, the size of these structures continues to grow. To withstand the harsh deepwater environment and ensure the safe and stable operation of risers, cables, and other facilities, the heave performance of these structures can be improved by adding damping boxes, without significantly increasing the amount of steel used in the platform. Existing damping boxes generally adopt a symmetrical design, adding an annular box structure to the main body of the cylindrical floating structure. This significantly increases the overall diameter of the cylindrical floating structure, limiting its construction scenarios. Furthermore, the existing damping box structure is designed independently of the main structure of the cylindrical floating structure, resulting in significant local structural stress concentration at the connection between the damping box and the main body of the cylindrical floating structure, posing a challenge to structural fatigue design. Summary of the Invention

[0003] In response to the above technical problems, the present invention provides an asymmetric damping box optimization layout and design method based on restricted construction conditions, which is used to solve the problems that the damping boxes designed by existing methods are difficult to construct in domestic sites and difficult to fatigue design.

[0004] To achieve the above object, the present invention adopts the following technical solutions: A method for optimizing the layout and design of an asymmetric damping box based on constrained construction conditions includes: S1: Design the asymmetric damping box to reserve all the space required for mooring parts; S2: Arrange the transition section of the asymmetric damping box to obtain the bottom dimension of the cylindrical floating facility along the dock width direction; S3: Arrange the annular bulkhead of the asymmetric damping box; S4: Arrange the radial bulkheads of the asymmetric damping box so that the radial bulkheads are arranged continuously with the radial bulkheads inside the main body of the cylindrical floating facility; S5: Arrange the stiffeners of the asymmetric damping box in the radial direction of the top and bottom plates of the damping box and the outer plate of the transition section; S6: Arranging the sawteeth of the asymmetric damping box, wherein the sawteeth are arranged on the outer contour of the damping box designed in step S1; S7: Arrange the bulkhead openings of the asymmetric damping box and make openings at locations where the stress of the non-watertight bulkhead is relatively small according to the strength analysis results; S8: Arrange the brackets of the asymmetric damping box. The brackets are located at each concave shape mutation point of the integral bulkhead formed by connecting each radial bulkhead with the inner radial bulkhead of the cylindrical floating facility body. S9: Optimize the structure of the asymmetric damping box.

[0005] In the asymmetric damping box optimization layout and design method based on constrained construction conditions, preferably, step S1 includes the following specific steps: Taking the symmetrical outer contour of the damping box obtained from the overall performance analysis of the cylindrical floating facility as the basis, the circumferential length and the angle between the two side edges and the radial direction of each damping box are adjusted respectively, and all the space required for the mooring parts is required to be reserved to ensure that all damping boxes do not interfere with any mooring parts during the construction, installation, production, release and displacement processes.

[0006] In the asymmetric damping box optimization layout and design method based on constrained construction conditions, preferably, step S2 includes the following specific steps: According to the construction plan, the cylindrical floating facility including the damping box is arranged in the target dock along the construction orientation, so that the center point of the cylindrical floating facility coincides with the axis of the target dock, and the dimension D of the bottom of the cylindrical floating facility along the dock width direction is obtained; the dock width B of the target construction site is determined; if BD ≥ 4m, this plan is used as the optimal design plan for the outer contour of the damping box; if BD < 4m, only the outer contour of the damping box within the range of (B-4)m is retained, and the outer contour of the damping plate is simplified to a plane 2m away from the dock wall, so that any point of the damping box is at least 2m away from the dock wall.

[0007] In the asymmetric damping box optimization layout and design method based on constrained construction conditions, preferably, step S3 includes the following specific steps: An annular bulkhead is arranged inside the damping box. The annular bulkhead is a non-watertight bulkhead. It takes a curved surface at the connection position with the transition section, and the rest takes a flat surface and is evenly arranged. The spacing between the remaining annular bulkheads is represented by the parameter l, and the spacing between the annular bulkheads is 3 to 5m.

[0008] In the above-mentioned method for optimizing the arrangement and design of an asymmetric damping box based on constrained construction conditions, preferably, step S4 includes the following specific steps: The radial bulkheads are arranged continuously with the radial bulkheads inside the main body of the cylindrical floating facility and adopt the same bulkhead type. Each radial bulkhead inside the main body has a corresponding radial bulkhead inside the heave plate to ensure the ability of the damping box to withstand vertical loads on the top and bottom surfaces.

[0009] In the above-mentioned method for optimizing the arrangement and design of an asymmetric damping box based on constrained construction conditions, preferably, step S5 includes the following specific steps: Radial stiffeners are arranged on the top and bottom plates of the damping box and the outer plates of the transition section. The two ends of the stiffeners are supported by the bulkheads. The position of each stiffener is continuous with the stiffeners on the inner deck of the main body of the cylindrical floating facility. The stiffeners on other structures of the damping box are arranged in a manner that is continuous with the existing stiffeners.

[0010] In the above-mentioned method for optimizing the arrangement and design of an asymmetric damping box based on constrained construction conditions, preferably, step S6 includes the following specific steps: A serration arrangement is added to the outer contour design of the damping box formed in step S1. The serration is trapezoidal in design, with the two ends of its longer base located on the outer contour of the damping box formed in step S1 and corresponding to the positions of the stiffeners. Its axis of symmetry coincides with the radial bulkhead arranged in step S2. When the total dimension along the dock width does not exceed (B-4) m, each radial bulkhead has a corresponding serration arrangement.

[0011] In the above-mentioned method for optimizing the arrangement and design of an asymmetric damping box based on constrained construction conditions, preferably, step S7 includes the following specific steps: Based on the asymmetric damping box arrangement scheme formed in step S6, scale planning is carried out to form an asymmetric damping box structure scheme. Based on the asymmetric damping box structure scheme, a strength analysis is carried out, and holes are opened at positions where the stress of the non-watertight bulkhead is relatively small according to the strength analysis results.

[0012] In the above-mentioned method for optimizing the arrangement and design of an asymmetric damping box based on constrained construction conditions, preferably, step S8 includes the following specific steps: Based on the asymmetric damping box arrangement scheme formed in step S6, brackets are added at each concave shape mutation point of the integral bulkhead formed by connecting each radial bulkhead with the radial bulkhead inside the cylindrical floating facility body, as reinforcement of the key position of the potential fatigue design of the damping box.

[0013] In the above-mentioned method for optimizing the arrangement and design of the asymmetric damping box based on constrained construction conditions, preferably, step S9 includes the following specific steps: The contradiction between lightweight and strength in structural design is mainly achieved by adjusting the layout and shape of the structure and optimizing the force transmission path. The structural analysis and optimization of the asymmetric damping box are mainly achieved by adjusting the parameter l and the shape of the bracket.

[0014] The present invention has the following advantages due to the adoption of the above technical solution: The damping box designed by the method of the present invention can improve the heave motion performance of the cylindrical floating facility, solve the problem that the damping box restricts the construction scenario of the cylindrical floating facility, and solve the problem of obvious local structural stress concentration at the connection position between the damping box and the main body of the cylindrical floating facility, so as to better meet the needs of deep-sea energy development. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic top view of an asymmetric damping plate solution provided in one embodiment of the present invention; Figure 2 A schematic cross-sectional view of the bulkhead of the asymmetric damping plate solution provided in this embodiment of the present invention; The reference numerals in the figures are as follows: 1-External contour; 2-Annular bulkhead; 3-Radial bulkhead; 4-Serration; 5-Bulkhead opening; 6-Bracket; 7-Space required for mooring components; 8-Circumferential length of damping box; 9-Dimension D of the bottom of the cylindrical floating facility along the dock width; 10-Longer bottom edge of the serration; 11-Serration axis of symmetry; 12-Main structural area of ​​the cylindrical floating facility. DETAILED DESCRIPTION

[0016] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention are described clearly and completely below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by ordinary persons in this field based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0017] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second", "third", "fourth" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0018] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inner side," "outer side," "lower," "upper," etc. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.

[0019] Existing damping boxes are generally designed in a symmetrical form, with an annular box structure added to the outside of the main body of the cylindrical floating facility. This significantly increases the overall diameter of the cylindrical floating facility, restricting the construction scenarios of the cylindrical floating facility. At the same time, the existing damping box structure is designed independently of the main structure of the cylindrical floating facility, resulting in significant local structural stress concentration at the connection point between the damping box and the main body of the cylindrical floating facility, posing a challenge to structural fatigue design.

[0020] Based on the above technical problems, the present invention provides an asymmetric damping box optimization layout and design method based on restricted construction conditions, which is used to solve the problems that the damping box designed by the existing method is difficult to construct in domestic sites and has difficulty in fatigue design.

[0021] like Figure 1 、 2 As shown, the method for optimizing the layout and design of an asymmetric damping box based on constrained construction conditions according to the present invention includes the following steps: S1: Design the asymmetric damping box to reserve all the space required for the mooring parts7; S2: Arrange the transition section of the asymmetric damping box to obtain a dimension of 9 along the dock width of the bottom of the cylindrical floating facility; S3: Arrange the annular bulkhead 2 of the asymmetric damping box; S4: Arrange the radial bulkhead 3 of the asymmetric damping box, so that the radial bulkhead 3 is arranged continuously with the radial bulkhead inside the cylindrical floating facility body; S5: Arrange the stiffeners of the asymmetric damping box in the radial direction of the top and bottom plates of the damping box and the outer plate of the transition section; S6: Arranging the saw teeth 4 of the asymmetric damping box, wherein the saw teeth 4 are arranged on the outer contour 1 of the damping box designed and formed in step S1; S7: Arrange the bulkhead opening 5 of the asymmetric damping box, and make the opening at a position where the stress of the non-watertight bulkhead is relatively small according to the strength analysis result; S8: Arrange the brackets 6 of the asymmetric damping box. The brackets 6 are located at each concave shape mutation point of the integral bulkhead formed by connecting each radial bulkhead 3 with the radial bulkhead inside the cylindrical floating facility body. S9: Optimize the structure of the asymmetric damping box.

[0022] Furthermore, step S1 includes the following specific steps: based on the symmetrical damping box outer profile 1 obtained from the overall performance analysis of the cylindrical floating facility, the circumferential length 8 and the angle between the two side edges and the radial direction of each damping box are adjusted respectively, and all the space 7 required for the mooring parts is required to be reserved to ensure that all the damping boxes do not interfere with any mooring parts during the construction, installation, production, release, and displacement processes.

[0023] Furthermore, step S2 includes the following specific steps: according to the construction plan, arranging the cylindrical floating facility including the damping box along the construction orientation in the target dock, so that the center point of the cylindrical floating facility coincides with the axis of the target dock, and obtaining the dimension D9 of the bottom of the cylindrical floating facility along the dock width direction; determining the dock width B of the target construction site; if BD ≥ 4m, using this plan as the optimized design plan for the outer contour 1 of the damping box; if BD < 4m, retaining only the outer contour 1 of the damping box within the range of (B-4)m, simplifying the outer contour 1 of the damping plate into a plane 2m away from the dock wall, so that any point of the damping box is at least 2m away from the dock wall.

[0024] Furthermore, step S3 includes the following specific steps: arranging annular bulkheads 2 inside the damping box, the annular bulkheads 2 are non-watertight bulkheads, taking a curved surface at the connection position with the transition section, and taking a flat surface and evenly arranged in the rest. The spacing between the remaining annular bulkheads 2 is represented by parameter l, and the spacing between the annular bulkheads 2 is 3 to 5m.

[0025] Furthermore, step S4 includes the following specific steps: the radial bulkhead 3 is arranged continuously with the radial bulkhead inside the main body of the cylindrical floating facility, and adopts the same bulkhead type (watertight or non-watertight), and each radial bulkhead inside the main body has a corresponding radial bulkhead inside the heave plate to ensure the ability of the damping box to withstand loads perpendicular to the top and bottom surfaces.

[0026] Furthermore, step S5 includes the following specific steps: arranging radial stiffeners on the top and bottom plates of the damping box and the outer plate of the transition section, with both ends of the stiffeners supported by the bulkheads, each stiffener being positioned continuously with the stiffeners on the inner deck of the cylindrical floating facility body, and stiffeners on other structures of the damping box being arranged in a manner continuous with the existing stiffeners.

[0027] Furthermore, step S6 includes the following specific steps: adding a sawtooth 4 arrangement on the basis of the outer contour design of the damping box formed in step S1, wherein the sawtooth 4 is of trapezoidal design, with the two ends of its longer bottom side located on the outer contour 1 of the damping box formed in step S1 and corresponding to the position of the stiffener, and its axis of symmetry coincides with the radial bulkhead 3 arranged in step S2. When the total dimension in the direction of the dock width does not exceed (B-4) m, each radial bulkhead 3 has a corresponding sawtooth 4 arrangement.

[0028] Furthermore, step S7 includes the following specific steps: performing scale planning based on the asymmetric damping box arrangement scheme formed in step S6 to form an asymmetric damping box structure scheme, performing strength analysis based on the asymmetric damping box structure scheme, and drilling holes at positions where the stress of the non-watertight bulkheads is relatively small according to the strength analysis results. The holes are 0.6 m wide and 0.8 m high, and 1 to 3 holes are drilled in each non-watertight bulkhead.

[0029] Furthermore, step S8 includes the following specific steps: based on the asymmetric damping box arrangement scheme formed in step S6, a bracket 6 is added at each concave shape mutation point of the integral bulkhead formed by connecting each radial bulkhead 3 with the radial bulkhead inside the cylindrical floating facility body, as a reinforcement of the key position of the potential fatigue design of the damping box.

[0030] Furthermore, step S9 includes the following specific steps: the contradiction between lightweight and strength of the structural design is mainly achieved by adjusting the layout and shape of the structure and optimizing the force transmission path. The structural analysis and optimization of the asymmetric damping box is mainly achieved by adjusting the parameter l and the shape of the bracket.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for optimizing the layout and design of an asymmetric damping box based on constrained construction conditions, characterized in that: include: S1: Design the asymmetric damping box to reserve all the space required for mooring parts; S2: Arrange the transition section of the asymmetric damping box to obtain the bottom dimension of the cylindrical floating facility along the dock width direction; S3: Arrange the annular bulkhead of the asymmetric damping box; S4: Arrange the radial bulkheads of the asymmetric damping box so that the radial bulkheads are arranged continuously with the radial bulkheads inside the main body of the cylindrical floating facility; S5: Arrange the stiffeners of the asymmetric damping box in the radial direction of the top and bottom plates of the damping box and the outer plate of the transition section; S6: Arranging the sawteeth of the asymmetric damping box, wherein the sawteeth are arranged on the outer contour of the damping box designed in step S1; S7: Arrange the bulkhead openings of the asymmetric damping box and make openings at locations where the stress of the non-watertight bulkhead is relatively small according to the strength analysis results; S8: Arrange the brackets of the asymmetric damping box. The brackets are located at each concave shape mutation point of the integral bulkhead formed by connecting each radial bulkhead with the inner radial bulkhead of the cylindrical floating facility body. S9: Optimize the structure of the asymmetric damping box.

2. The asymmetric damping box optimization layout and design method based on constrained construction conditions according to claim 1 is characterized in that: Step S1 includes the following specific steps: Taking the symmetrical outer contour of the damping box obtained from the overall performance analysis of the cylindrical floating facility as the basis, the circumferential length and the angle between the two side edges and the radial direction of each damping box are adjusted respectively, and all the space required for the mooring parts is required to be reserved to ensure that all damping boxes do not interfere with any mooring parts during the construction, installation, production, release and displacement processes.

3. The method for optimizing the layout and design of asymmetric damping boxes based on constrained construction conditions according to claim 2 is characterized in that: Step S2 includes the following specific steps: According to the construction plan, the cylindrical floating facility including the damping box is arranged in the target dock along the construction orientation, so that the center point of the cylindrical floating facility coincides with the axis of the target dock, and the dimension D of the bottom of the cylindrical floating facility along the dock width direction is obtained; the dock width B of the target construction site is determined; if BD ≥ 4m, this plan is used as the optimal design plan for the outer contour of the damping box; if BD < 4m, only the outer contour of the damping box within the range of (B-4)m is retained, and the outer contour of the damping plate is simplified to a plane 2m away from the dock wall, so that any point of the damping box is at least 2m away from the dock wall.

4. The method for optimizing the layout and design of asymmetric damping boxes based on constrained construction conditions according to claim 3 is characterized in that: Step S3 includes the following specific steps: An annular bulkhead is arranged inside the damping box. The annular bulkhead is a non-watertight bulkhead. It takes a curved surface at the connection position with the transition section, and the rest takes a flat surface and is evenly arranged. The spacing between the remaining annular bulkheads is represented by the parameter l, and the spacing between the annular bulkheads is 3 to 5m.

5. The method for optimizing the layout and design of asymmetric damping boxes based on constrained construction conditions according to claim 4 is characterized in that: Step S4 includes the following specific steps: The radial bulkheads are arranged continuously with the radial bulkheads inside the main body of the cylindrical floating facility and adopt the same bulkhead type. Each radial bulkhead inside the main body has a corresponding radial bulkhead inside the heave plate to ensure the ability of the damping box to withstand vertical loads on the top and bottom surfaces.

6. The method for optimizing the layout and design of asymmetric damping boxes based on constrained construction conditions according to claim 5 is characterized in that: Step S5 includes the following specific steps: Radial stiffeners are arranged on the top and bottom plates of the damping box and the outer plates of the transition section. The two ends of the stiffeners are supported by the bulkheads. The position of each stiffener is continuous with the stiffeners on the inner deck of the main body of the cylindrical floating facility. The stiffeners on other structures of the damping box are arranged in a manner that is continuous with the existing stiffeners.

7. The method for optimizing the layout and design of asymmetric damping boxes based on constrained construction conditions according to claim 6 is characterized in that: Step S6 includes the following specific steps: A serration arrangement is added to the outer contour design of the damping box formed in step S1. The serration is trapezoidal in design, with the two ends of its longer base located on the outer contour of the damping box formed in step S1 and corresponding to the positions of the stiffeners. Its axis of symmetry coincides with the radial bulkhead arranged in step S2. When the total dimension along the dock width does not exceed (B-4) m, each radial bulkhead has a corresponding serration arrangement.

8. The method for optimizing the layout and design of asymmetric damping boxes based on constrained construction conditions according to claim 7 is characterized in that: Step S7 includes the following specific steps: Based on the asymmetric damping box arrangement scheme formed in step S6, scale planning is carried out to form an asymmetric damping box structure scheme. Based on the asymmetric damping box structure scheme, a strength analysis is carried out, and holes are opened at positions where the stress of the non-watertight bulkhead is relatively small according to the strength analysis results.

9. The method for optimizing the layout and design of asymmetric damping boxes based on constrained construction conditions according to claim 8, characterized in that: Step S8 includes the following specific steps: Based on the asymmetric damping box arrangement scheme formed in step S6, brackets are added at each concave shape mutation point of the integral bulkhead formed by connecting each radial bulkhead with the radial bulkhead inside the cylindrical floating facility body, as reinforcement of the key position of the potential fatigue design of the damping box.

10. The method for optimizing the layout and design of asymmetric damping boxes based on constrained construction conditions according to claim 9, characterized in that: Step S9 includes the following specific steps: The contradiction between lightweight and strength in structural design is mainly achieved by adjusting the layout and shape of the structure and optimizing the force transmission path. The structural analysis and optimization of the asymmetric damping box are mainly achieved by adjusting the parameter l and the shape of the bracket.

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