CN209956184U - Resistance-reducing partition plate - Google Patents
Resistance-reducing partition plate Download PDFInfo
- Publication number
- CN209956184U CN209956184U CN201920244553.XU CN201920244553U CN209956184U CN 209956184 U CN209956184 U CN 209956184U CN 201920244553 U CN201920244553 U CN 201920244553U CN 209956184 U CN209956184 U CN 209956184U
- Authority
- CN
- China
- Prior art keywords
- moon pool
- drag
- baffle
- drag reduction
- rear wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Vibration Prevention Devices (AREA)
Abstract
A drag reduction baffle for a moon pool is characterized in that the upper part of the drag reduction baffle is a straight wall perpendicular to the sea level, the lower part of the drag reduction baffle is connected with a baffle, and a connecting part is connected between the straight wall and the baffle. The connecting part can be in an arc shape, a fold line shape or a straight line shape. The shape of the drag reduction partition plate is matched with the rear wall of the moon pool. When the marine ship sails, the drag reduction partition plate is arranged in the middle or the front of the moon pool, and the drag reduction partition plate is matched with the drag reduction notch in the rear wall of the moon pool, so that the induced resistance caused by the violent shaking of the water body of the moon pool can be greatly reduced when the marine ship sails. When carrying out the maritime work operation under the parking situation, the utility model discloses a drag reduction baffle can move to moon pool back wall, avoids hindering the maritime work operation.
Description
Technical Field
The utility model belongs to the ocean engineering field particularly relates to a drag reduction baffle.
Background
The moon pool is widely applied to marine ships. The drilling ship or the pipe laying ship needs to operate through the moon pool when drilling or laying the pipe cable. However, due to the use of the moon pool, the water body inside the moon pool is shaken under the excitation of navigation or environmental waves, and additional resistance is induced by the water body sloshing. The additional resistance of the moon pool may in extreme cases even be greater than the resistance of the bare vessel (the hull does not comprise the moon pool portion), thereby substantially increasing fuel consumption.
In recent years, the moon pool has been designed to be large in size in order to pursue more efficient operation. Taking a drilling vessel using a double derrick design as an example, it requires a moonpool with openings of dimensions of 42m x 15m or more. The large-opening moon pool enables water in the moon pool to shake more violently, additional resistance is larger, and required oil consumption is higher. This makes moon pool drag reduction more difficult and demanding.
Theoretical analysis shows that the resistance increase of the moon pool is mainly limited by the sloshing amplitude of the water body and the momentum of the fluid entering and exiting the moon pool. The existing drag reduction measures are generally designed in the direction of reducing the water body sloshing amplitude and limiting the momentum exchange between the moon pool and the external fluid. The current popular damping devices mainly include: flanges (flanges) to increase damping to reduce water sloshing, damping chambers (damming chambers), stepped moonpool designs (sides), and wedge/cut-out devices (edges/cut-out devices) to limit fluid momentum exchange inside and outside the moonpool.
In general, the design of the damping device is performed by ship model test. However, due to the limitations of ship model testing equipment, experimental period and precision, especially, the scale effect accompanying the use of the reduction model during the ship model test can cause the uncertainty of the drag reduction effect and the insufficient precision of the drag reduction device, and it is expensive to provide a drag reduction design scheme suitable for the specific operating water area characteristics.
SUMMERY OF THE UTILITY MODEL
To current moon pool drag reduction structural design consuming time long, costly, the precision is not enough and the uncertain not enough of drag reduction effect, the utility model provides a drag reduction baffle for in the moon pool separates the moon pool through the drag reduction baffle and changes the momentum exchange of the rocking mode of moon pool water with the inside water of reduction moon pool and the fluid outside the moon pool, realizes the drag reduction.
In order to achieve the purpose, the utility model provides a drag reduction baffle for moon pool, the upper portion of drag reduction baffle is the straight wall perpendicular to sea level, the lower part of drag reduction baffle is connected with the baffle; a connecting part is connected between the straight wall and the baffle; the shape of the drag reduction partition plate is matched with the rear wall of the moon pool; when in navigation, the drag reduction clapboard is arranged in the middle or the front part of the moon pool; when the moon pool is parked, the drag reduction partition board is close to the rear wall of the moon pool.
Optionally, in the drag reduction partition plate, if the rear wall of the moon pool is an arc notch, the connecting portion is arc-shaped, and the arc radius of the arc is set to 0.3 to 0.7 design draft.
Optionally, in the drag reduction partition board, if the rear wall of the moon pool is a zigzag-shaped notch, the connecting portion is zigzag-shaped, and an included angle of the zigzag line is set to 10oTo 35o。
Optionally, in the above-mentioned drag reduction partition plate, if the rear wall of the moon pool is a linear cut, the connecting portion is linear, and the length of the connecting portion is set to be smaller than 0.5m when the connecting portion extends out of the moon pool.
Optionally, in the drag reduction partition plate, the front end of the baffle plate is connected to the lower part of the drag reduction partition plate, and the rear end of the baffle plate extends towards the rear wall of the moon pool.
Optionally, the number of the drag reduction partition plates is singular.
Optionally, the drag reduction partition plate is further connected with a pulley, the pulley is connected with a slide rail, the slide rail is arranged between the front wall and the rear wall of the moon pool and is located on a deck, and the drag reduction partition plate is driven by the pulley to move on the slide rail; the anti-drag partition plate is also connected with a locking device; the locking device comprises an anchor plate and a plurality of anchor seats, wherein the anchor plate is connected to the drag reduction partition plate and moves along with the drag reduction partition plate, the anchor seats are arranged at different positions along the moving track of the anchor plate, and the anchor seats lock the drag reduction partition plate connected with the anchor plate when the anchor plate is embedded into the anchor seats; during navigation, the anti-drag partition plates are fixed in the moon pool by the locking device, and a spacing distance is reserved between the anti-drag partition plates; when the device is parked, the anti-drag partition plates are fixed by the locking devices and are attached to the rear wall of the moon pool.
Advantageous effects
The utility model discloses utilize hydrodynamics numerical simulation technique or ship model test design one kind to be used for the drag reduction baffle of moon pool. The upper part of the drag reduction clapboard is a straight wall vertical to the sea level, the lower part of the drag reduction clapboard is connected with a baffle, and a connecting part is connected between the straight wall and the baffle. The connecting part is arc-shaped, fold-line-shaped or linear. The shape of the drag reduction partition plate is matched with the rear wall of the moon pool, so that the water body shaking mode of the moon pool can be changed. When the marine ship sails, the drag reduction partition plate is arranged in the middle or the front of the moon pool, and the drag reduction partition plate is matched with the drag reduction notch in the rear wall of the moon pool, so that the induced resistance caused by the violent shaking of the water body of the moon pool can be greatly reduced when the marine ship sails. When carrying out the maritime work operation under the parking situation, the utility model discloses a drag reduction baffle can move to moon pool back wall, avoids hindering the maritime work operation.
Further, because the oscillation phases of the vertical pistons of the water bodies of the adjacent moon pools separated by the anti-drag partition plates are opposite, when odd anti-drag partition plates are selected to be arranged in the moon pools, the additional resistance of the water bodies in the moon pools is subtracted by the oscillation phases of the vertical pistons in the opposite phases in a staggered manner. Thereby being more beneficial to further reducing the overall net resistance of the moon pool.
The baffle plate connected with the lower part of the drag reduction clapboard can further reduce the momentum exchange of fluid inside and outside the moon pool, thereby enhancing the blocking effect of the drag reduction clapboard and further playing the drag reduction effect of the drag reduction clapboard.
Drawings
FIG. 1 is a schematic structural view of the drag reduction partition plate of the present invention applied to a moon pool with a broken line-shaped cut on the rear wall;
FIG. 2 is a schematic structural view of the drag reduction partition plate of the present invention applied to a moon pool with a rear wall having a straight line-shaped cut;
FIG. 3 is a schematic structural view of the drag reduction partition plate applied to the moon pool with the rear wall structure being a circular arc-shaped notch
FIG. 4 is a schematic diagram of the cavitation flow of the present invention applied to the rear vortex shape of the moon pool with the rear wall structure of the arc-shaped notch;
FIG. 5 is a schematic view of the position relationship between the multiple groups of anti-drag baffles of the present invention;
FIG. 6 is a schematic view of the anti-phase oscillation of the vertical piston of the body of water between adjacent drag reducing baffles of FIG. 5;
FIG. 7 is a schematic view of the connection mode of the sliding chute according to the present invention;
fig. 8 is a schematic structural view of a locking device according to the present invention;
FIG. 9 shows the condition of the water body in vertical piston oscillation by separating the moon pool.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention will be combined below to clearly and completely describe the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described herein are merely exemplary of the invention and are not intended to limit the invention to the particular forms disclosed. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
The utility model discloses in "preceding" is the direction of coastal worker's boats and ships navigation.
The utility model discloses in "back" is the direction opposite with marine vessel navigation direction.
Referring to fig. 1, the present invention provides a drag reduction partition board capable of moving horizontally in a moon pool 5 of a marine vessel. The drag reduction baffle is applied to a moon pool with a structure of a rear wall 4 being a fold line-shaped notch. The upper part 1 of which is of a straight-walled design. The connecting part 2 at the lower part of the clapboard can be correspondingly selected to be a broken line type according to the shape of the rear wall 4 of the moon pool. Referring to fig. 2 or 3, if the rear wall 4 of the moon pool is configured as a straight cut or a circular cut, the connecting portion of the drag reduction partition may be selected from a straight cut and a circular cut.
The structure can be designed through ship model tests or computational fluid mechanics simulation, so that the appearance of the anti-drag partition plate is fully matched with the appearance of the rear wall of the moon pool, and the optimal anti-drag effect is obtained.
Particularly, the utility model provides a drag reduction baffle, its structure is different from current fairing. The existing drag reduction device only reduces the sloshing amplitude of a water body of a moon pool by arranging a damping flange on the side wall of the moon pool, restricts the momentum exchange of fluid inside and outside the moon pool, and achieves the aim of drag reduction. The utility model provides a drag reduction baffle, it is except that the accessible adds like general damping flange in order to reach the drag reduction purpose, drag reduction baffle itself can also directly make the water rock the mode change and realize the decay to the additional resistance of moonpool. This is due to: for the moon pool, the partition plate is arranged in the middle or the front of the moon pool to shorten the moon pool coherent water body, and the moon pool water body shaking mode is changed from original horizontal shaking into vertical piston oscillation due to the division of the drag reduction partition plate on the water body. If the proper position distribution of the drag reduction partition is designed through ship model tests or computational fluid dynamics simulation, the Cavity Flow (Cavity Flow) in the form of the vortex in the moon pool shown in fig. 4 can be obtained easily. The vortex-shaped cavitation flow in the moon pool is relatively stable, and the exchange of fluid momentum inside and outside the moon pool is greatly reduced and even blocked. In this state, the sloshing of the water body of the moon pool and the additional resistance induced by the sloshing can be greatly reduced.
In addition, referring to the result of the fluid mechanics simulation shown in fig. 6, the phases of the oscillation of the vertical pistons of the water bodies of the two adjacent moon pools separated by the drag reduction partition plate are opposite, and the phases are opposite, so that the additional resistances between the moon pools are subtracted in a staggered manner, and the total net resistance of the moon pools is further reduced.
Furthermore, the above-described drag reducing barrier may also be provided in a removable form. Referring to fig. 7, it can be freely moved by the cooperation of a slide rail 62 and a pulley 61 provided between the front and rear walls of the moon pool. A locking device 7 can be further arranged on the anti-drag clapboard, so that the anti-drag clapboard can be moved and locked at the rear part of the moon pool under the parking condition and during the engineering operation. At this time, the anti-drag partition plates can be properly wedged with each other because the shape of the anti-drag partition plates is close to that of the rear wall of the moon pool. Therefore, the obstruction of the drag reduction partition plate to the moon pool space can be reduced, and the engineering operation is convenient. During navigation, the anti-drag partition plate can be fixed at a position close to the front wall of the moon pool by the locking device through the locking device 7, particularly, the anchoring plate is embedded into the anchor seat. So, through inciting somebody to action the drag reduction baffle locking is in the different positions in the moon pool, the utility model discloses can deal with different navigational speed and underwater drag reduction demand.
Generally, the sliding rail-pulley combination and locking device 7 can be placed on a deck without being soaked by seawater, so that the corrosion of the deck is reduced, and the maintenance is convenient. The drag reducing spacer may specifically achieve its securing purpose by the locking device described in fig. 8. When the locking device rotates anticlockwise to an anchoring position, the anchoring plate 71 completely falls into the anchor seat 72 to realize locking; when the locking device rotates clockwise to the opening position, the anchoring plate 71 is separated from the anchor seat 72, and the locking device is unlocked and opened. Therefore, the utility model provides a moon pool can be convenient be applied to such as marine worker operation environment as well drilling, pipe laying, shop cable, and do not cause the interference to marine worker's operation.
In the preferred embodiment of the present invention, the specific parameters of the baffle plate in the moon pool can be optimized according to the shape of the rear wall of the moon pool. For example, if the rear wall of the moon pool is designed by adopting an arc notch, a model can be established according to the moon pool, the working water area and the navigation characteristics of the moon pool; and selecting a similar shape according to the shape of the rear wall of the moon pool to establish a model of the drag reduction partition plate, and determining the shape of a baffle plate 3 connected with the lower part of the drag reduction partition plate according to the shape of the drag reduction partition plate. And then determining the size and structural parameters of the resistance-reducing partition plate with the maximum resistance-reducing effect and the baffle plate 3 or the circular arc radius size of the resistance-reducing partition plate through a ship model test or numerical simulation.
For example, in some implementations, the drag reducing barrier is wedged into the shape of the rear wall of the moon pool, with the lower portion thereof using a circular arc shape according to the rear wall of the moon pool, as shown in fig. 4. If the rear wall notch is in a folded line or straight wall shape and is wedged with the rear wall of the moon pool, the anti-drag partition plate is also designed by using the folded line or straight wall, but a horizontal (or inclined) baffle plate is added at the bottom of the partition plate, as shown in fig. 1 and 2, so that the partition plate has the effect of blocking the momentum exchange of fluid inside and outside the moon pool, and the anti-drag effect of the partition plate is further exerted.
In addition, the optimal location of the drag reducing barrier in the moon pool is also one of the important parameters for barrier design. Generally, the position of the drag reduction baffle is arranged at the front of the middle part of the moon pool. This results in a smaller opening in the front of the moon pool and thus less resistance; and an arc-shaped or horizontal/inclined baffle can be used at the rear of the moon pool as much as possible, and the momentum exchange of fluid inside and outside the moon pool is blocked by utilizing the shielding effect of the baffle, so that the drag reduction is realized.
The optimal position of the drag reducing barrier, including its horizontal and vertical positions, can also be determined for different boat speeds and draft conditions by means of the modeling test described above. Due to the arrangement of the partition plates, the water bodies of the moon pools can oscillate in a vertical manner, and the oscillation phases of the water bodies of the adjacent moon pools are opposite. The general criteria that may be selected for simulation test optimization goals when identifying the best location are: the oscillation amplitude of the moon pool water body is minimized.
In another implementation of the present invention, referring to fig. 5, if the moon pool is an ultra-long moon pool, a multi-partition design can be adopted. Generally, the larger the number of the anti-drag partition plates is, the better the anti-drag effect is; and singular spacers may be preferred over even integers. The singular baffle plate divides the moon pool water body into an even number of areas, and the additional resistance of every two of the even number of water body areas can be counteracted mutually to the maximum extent due to the fact that the vibration phases of the water bodies are opposite. Therefore, the arrangement of the single baffle reducing plate can ensure that the drag reduction effect of the moon pool is better. However, considering the complexity of the multi-partition system and the convenience of operation, the design is generally preferred to minimize the number of partitions.
The invention relates to a design method of a drag reduction clapboard in a moon pool, which mainly comprises the following steps: 1. according to the shape of the rear wall of the moon pool, the anti-drag partition plate can adopt a shape which can be fully matched with the anti-drag partition plate as much as possible; 2, the length of the moonpool divided by the partition plate needs to enable the water body in the moonpool to shake in a vertical piston manner; according to the draft d and the moon pool width B, the length L of the moonpoolsubIt can be preliminarily decided by the design curve in fig. 9; 3. finely adjusting the position of the partition plate and optimizing the length of the baffle plate 3 by using a fluid mechanics numerical simulation or a pool test to reduce the resistance increase of the moon pool to the minimum under the conditions of preset navigational speed and draught; and 4, calculating (fluid mechanics numerical model) or measuring (pool test) the load acting on the drag reduction partition plate, and designing the structural size of the partition plate and the locking device according to the load. Therefore, the design of the anti-drag partition plate is realized, and the anti-drag partition plate is used for separating the moon pool to change the shaking mode of the water body of the moon pool so as to reduce momentum exchange between the water body in the moon pool and fluid outside the moon pool and realize anti-drag.
To sum up, the utility model discloses a mobilizable drag reduction baffle, its upper portion is the design of straight wall, and its lower part is according to moon pool back wall appearance, and corresponding selection baffle lower part geometry is right angle type, continuous broken line type or curve type. The appearance of the partition plate can be fully matched with the appearance of the rear wall of the moon pool through a ship model test or computational fluid mechanics simulation design, and the optimal drag reduction effect can be obtained through optimizing the structural dimension parameters. For parking engineering operations, the partition is disposed proximate to the rear wall of the moon pool, as shown at B in fig. 1 to 3. The shape of the partition plate is properly wedged with the shape of the rear wall of the moon pool so as to reduce the obstruction of the partition plate to the moon pool space and facilitate engineering operation. During navigation, the baffle needs to be moved and locked at a specific position in the moon pool, such as the position B in figures 1-3 or the drag reduction baffle is arranged in the way of figure 5, so as to meet the drag reduction requirements at different navigation speeds and under draft.
The sliding rails of the movable partition plates are generally arranged on the deck, so that the movable partition plates are guaranteed not to be soaked by seawater, corrosion is reduced, and maintenance is convenient. The fixing of the partition is effected with the locking device of fig. 8. The mobile drag reduction barrier design can be a multi-barrier system to maximize drag reduction for the moon pool, as shown in fig. 5.
In order to exert the resistance reduction effect to the utmost extent, the lower end of the movable partition plate needs to be specially designed, so that the momentum entering the moon pool is reduced to the minimum, the violent shaking of the water body of the moon pool is reduced, and the resistance reduction effect of the moon pool is achieved. The utility model discloses optimization to portable baffle can generally be based on design navigational speed, moon pool size and the existing moon pool back wall drag reduction incision shape, through model test or computational fluid mechanics simulation realization. Wherein the optimization parameters include: the size, the structural parameters, the position, the number and the spacing distance of the baffle 3 and the anti-drag baffle, wherein the baffle is arranged in the moon pool.
The above description is only for the embodiments of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several changes and modifications can be made, which all fall within the scope of the present invention.
Claims (7)
1. A drag reduction baffle plate is used for a moon pool, and is characterized in that the upper part of the drag reduction baffle plate is a straight wall (1) vertical to the sea level, and the lower part of the drag reduction baffle plate is connected with a baffle plate (3); a connecting part (2) is connected between the straight wall (1) and the baffle (3);
the shape of the drag reduction partition plate is matched with the rear wall of the moon pool;
when in navigation, the drag reduction clapboard is arranged in the middle or the front part of the moon pool;
when the moon pool is parked, the drag reduction partition board is close to the rear wall of the moon pool.
2. Drag reducing partition according to claim 1, characterized in that if the rear wall of the moon pool is a circular arc cut, the connection part (2) is arc-shaped, and the arc radius of the arc-shape is set to 0.3 to 0.7 design draft.
3. Drag reducing partition according to claim 1, characterized in that if the rear wall of the moon pool is a zigzag cut, the connection part (2) is zigzag and the angle of the zigzag is set to 10oTo 35o。
4. Drag reducing partition according to claim 1, characterized in that the connecting part (2) is rectilinear if the rear wall of the moon pool is a rectilinear cut, the length of the connecting part (2) being arranged to project less than 0.5m from the moon pool.
5. A drag reducing baffle as claimed in any one of claims 1 to 4 wherein the baffle (3) has a front end connected to the lower part of the baffle and a rear end extending towards the rear wall of the moon pool (3).
6. The drag reducing spacer of claim 5 in the singular.
7. The drag reducing baffle of claim 6 further connected with a pulley (61), wherein the pulley (61) is connected with a slide rail (62), the slide rail (62) is arranged between the front wall and the rear wall of the moon pool on the deck, and the drag reducing baffle is driven by the pulley (61) to move on the slide rail (62);
the anti-drag partition plate is also connected with a locking device (7); the locking device comprises an anchor plate (71) and a plurality of anchor seats (72), wherein the anchor plate (71) is connected to the anti-drag partition plate and moves along with the anti-drag partition plate, the anchor seats (72) are arranged at different positions along the moving track of the anchor plate (71), and the anchor seats (72) lock the anti-drag partition plate connected with the anchor plate (71) when the anchor plate (71) is embedded in the anchor seats;
during navigation, the anti-drag partition plates are fixed in the moon pool by the locking device (7), and a spacing distance is reserved between the anti-drag partition plates;
when the device is parked, the anti-drag partition plates are fixed by the locking devices and are attached to the rear wall of the moon pool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920244553.XU CN209956184U (en) | 2019-02-27 | 2019-02-27 | Resistance-reducing partition plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920244553.XU CN209956184U (en) | 2019-02-27 | 2019-02-27 | Resistance-reducing partition plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209956184U true CN209956184U (en) | 2020-01-17 |
Family
ID=69238102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920244553.XU Active CN209956184U (en) | 2019-02-27 | 2019-02-27 | Resistance-reducing partition plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209956184U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109795635A (en) * | 2019-02-27 | 2019-05-24 | 招商局重工（江苏）有限公司 | A kind of drag reduction partition and its design method |
-
2019
- 2019-02-27 CN CN201920244553.XU patent/CN209956184U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109795635A (en) * | 2019-02-27 | 2019-05-24 | 招商局重工（江苏）有限公司 | A kind of drag reduction partition and its design method |
| CN109795635B (en) * | 2019-02-27 | 2024-07-12 | 招商局重工（江苏）有限公司 | Drag reduction baffle and design method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100885990B1 (en) | Anti-sloshing device in Moon-pool | |
| US9340940B2 (en) | Floating breakwater | |
| KR101159196B1 (en) | Moonpool and drillship having the same | |
| DK2374708T3 (en) | Resistance reducing devices to the moon pool | |
| RU2203828C2 (en) | Hull construction | |
| Yang et al. | Experimental investigation on hydrodynamic effectiveness of a water ballast type floating breakwater | |
| KR20100020613A (en) | Drag reduction device for a moon pool | |
| CN209956184U (en) | Resistance-reducing partition plate | |
| KR101185716B1 (en) | Underwater Breakwater | |
| CN202935532U (en) | Moon pool capable of reducing sailing resistance of drilling ship and shipping waves of midship | |
| CN211336370U (en) | Marine geology investigation boats and ships moon pool structure | |
| CN105015698A (en) | Damping device for interior of moon pool of drilling ship | |
| Kirkegaard et al. | Wake wash of high-speed craft in coastal areas | |
| Shabani et al. | Slam loads and kinematics of wave-piercing catamarans during bow entry events in head seas | |
| KR20130066019A (en) | Flowing reduction apparatus of moon-pool structures of drill ship | |
| KR101487513B1 (en) | Wave absorbing apparatus of moonpool | |
| CN109795635B (en) | Drag reduction baffle and design method thereof | |
| CN105416521A (en) | Platform moon pool damping device | |
| CN110409367B (en) | Floating comb-shaped breakwater device capable of utilizing wave energy and application | |
| CN109159853A (en) | The self-adapting type mooring gear of offshore phytal zone | |
| Son et al. | Drag reduction of recess type moonpool under vessel’s forward speed | |
| CN205589429U (en) | Platform moon pool fairing | |
| CN203142985U (en) | Water floating base platform for ocean current power generation | |
| JP4775738B2 (en) | Long-period wave reduction structure | |
| JP6399323B2 (en) | Offshore floating structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |