CN108560523B - Heave plate combining electromagnetic induction and particle damping - Google Patents
Heave plate combining electromagnetic induction and particle damping Download PDFInfo
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- CN108560523B CN108560523B CN201810319083.9A CN201810319083A CN108560523B CN 108560523 B CN108560523 B CN 108560523B CN 201810319083 A CN201810319083 A CN 201810319083A CN 108560523 B CN108560523 B CN 108560523B
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- heave plate
- particle
- cavity shell
- electromagnetic induction
- heave
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
Abstract
The invention relates to a heave plate combining electromagnetic induction and particle damping, which comprises a heave plate cavity shell, an internal strengthening truss, particles, a particle outer sleeve and a buffer material. The heave plate cavity shell is a hollow cuboid or cylindrical shell with the edge in a corner cut mode, a reinforcing truss is erected in the heave plate cavity shell, a particle outer sleeve is arranged in the residual space inside the heave plate cavity shell, particles are filled in the particle outer sleeve, and a buffer material covers the inner side surface of the heave plate cavity shell. Under the load effects of wind, waves and the like, viscous damping generated by the movement of peripheral water flow is driven by the heave plate, the edge cut angle is thinned to increase energy dissipation generated by the falling and impacting probability of outer-side vortexes, energy conversion consumption formed by electromagnetic induction caused by the movement of inner particles and energy dissipation generated by the collision of the particles and the boundary are used for converting and dissipating the kinetic energy of the structure, the structural damping is increased, the inherent period of the structure is prolonged by the increase of additional mass, the heave movement of the semi-submersible type ocean platform is effectively inhibited, and the use performance of the ocean platform is improved.
Description
Technical Field
The invention relates to a heave plate combining electromagnetic induction and particle damping, in particular to a particle damping device which can cause electromagnetic induction in the heave plate with an improved shape for assisting energy consumption, is applied to heave motion control of a semi-submersible type ocean platform, and belongs to the field of ocean engineering vibration control.
Background
Compared with other common platforms, the semi-submersible platform has the characteristics of strong wind and wave resistance, wide water depth adaptation and wide application range, and gradually becomes a mainstream platform for deep sea drilling. However, due to the characteristic of shallow draft, the heaving vibration problem of the semi-submersible platform is particularly obvious, and the use performance of the semi-submersible platform is affected. To solve this problem, heave plates have been introduced as an adjunct structure. The additional mass of the platform in the heaving motion direction is increased by arranging the horizontal flat plate connected with the main structure of the platform at the enough depth below the platform, so that the natural period of the heaving of the platform is increased, the periodic range of wave energy concentration can be avoided, meanwhile, the viscosity damping during the heaving is effectively increased, and the heaving vibration of the platform is reduced.
However, the current conventional heave plate still has some disadvantages: firstly, the traditional heaving plate can play a good role in controlling heaving movement only by being arranged at a larger depth, but the cost is sharply increased, and the semi-submersible platform main body structure has shallow draft, so that the heaving plate is not suitable for being arranged too deep; secondly, for a normally designed semi-submersible platform, the additional mass provided by the heave plate has little influence on the whole structure; in addition, the traditional heave plate mainly depends on the falling of edge vortex to collide with energy dissipation, and the damping provided by the traditional heave plate is not large enough; in addition, conventional heave plates are often damaged by inadequate structural strength of the outlet plane. Therefore, the heave plate is improved on the basis of the conventional heave plate, the heave plate is used as a container, and the electromagnetic induction and particle damping technology is combined, so that the damping energy consumption capacity of the heave plate device can be effectively improved, and the heave plate device has important significance for reducing the heave motion of the semi-submersible type ocean platform.
Disclosure of Invention
The invention provides a heave plate combining electromagnetic induction and particle damping, which is improved on the basis of exerting the advantages of the traditional heave plate, introduces a particle damping device capable of causing electromagnetic induction effect, optimizes the appearance and structure of the heave plate, can effectively reduce the heave motion of the semi-submersible type ocean platform during working, and further improves the service performance of the ocean platform.
In order to achieve the purpose, the invention adopts the following technical scheme.
The invention provides a heave plate combining electromagnetic induction and particle damping, which consists of a heave plate cavity shell 1, a reinforced truss 2, particles 3, a particle outer sleeve 4 and a buffer material 5, wherein: the heave plate cavity shell 1 is a hollow cuboid or cylindrical shell with a corner cut edge; the reinforced truss 2 is positioned in the heave plate receptor shell 1, the top of the reinforced truss 2 is connected with the top of the inner wall of the heave plate cavity shell 1, the bottom of the reinforced truss 2 is connected with the bottom of the inner wall of the heave plate cavity shell 1, and the reinforced truss 2 provides structural support for the heave plate cavity shell 1; the residual space in the cavity shell 1 of the heave plate is provided with a particle outer sleeve 4; each particle outer sleeve 4 is internally filled with particles 3; the inner wall surface of the heave plate cavity shell 1 is covered with a buffer material 5; under the load effect such as wind or wave, through the viscidity damping that the board that dangles flows the motion of peripheral rivers and produce, the energy dissipation that the outside swirl drops the striking probability and produces is increased in the thinning of edge corner cut, the energy conversion consumption that inside granule motion arouses electromagnetic induction to form and the kinetic energy that the granule collided the energy dissipation that produces with the boundary and convert and dissipate the structure, increase structure damping, simultaneously through the dead weight of the board that dangles and the interact with water, additional mass has been increased, make the inherent cycle increase of overall structure, avoid the concentrated periodic range of wave energy, effectively restrain the motion of dangling of semi-submerged formula platform, improve platform's performance.
In the invention, the heave plate cavity shell 1 is designed into a cuboid or cylindrical shell form with the edge cut angle, the overall appearance thickness of the cavity is slightly larger than that of the traditional heave plate, and a space for storing an additional damping device and particle motion is reserved in the cavity.
In the invention, the particles 3 with permanent magnetism are filled in the particle outer sleeve 4, so that the electromagnetic induction effect can be caused when the particles move, the kinetic energy is converted into electric energy, and further converted into internal energy for dissipating energy; the inner side surface of the heave plate cavity shell 1 is covered with a buffer material 5, and the functions of enhancing energy dissipation caused by particle impact and protecting the shell are achieved.
In the invention, the heave plate cavity shell 1 is a cuboid or cylindrical shell with a chamfer at the edge, the edge thickness is not more than 1m, and the included angle between the chamfer inclined plane at the edge and the horizontal plane is 30-60 degrees.
In the invention, the internal reinforcing truss 2 is composed of section steel or a cold-formed thin-wall section steel rod piece.
In the present invention, the pellet 3 is a spherical permanent magnet having a diameter of 2mm to 50mm which is not larger than the inner diameter of the pellet outer sleeve 4.
In the present invention, the particle sheath 4 is a hollow cylinder with a vertical bus, and is made of a non-magnetic electric conductor with a certain resistance, such as copper.
In the present invention, the cushioning material 5 includes any one or more of rubber, foam, or knitted cotton to increase the energy dissipated by the impact and protect the shell.
Compared with the prior art, the invention has the following advantages:
1) the introduction of the particle damping helps to dissipate a large amount of energy, effectively increases the damping of the structure during heave motion, and the particle damping has the characteristic of large controllable vibration frequency range, and the frequency range of the heave vibration of the ocean platform is also large under the action of random obvious wave load, so that the particle damping has a remarkable effect of controlling the heave of the ocean platform.
2) The combination of electromagnetic induction and particle damping technology enables effective energy conversion to be generated in the particle motion process, particle kinetic energy is converted into electric energy of current in the particle outer sleeve, the electric energy is further converted into internal energy dissipation through the resistance effect of the outer sleeve, the dissipation efficiency of the kinetic energy is remarkably improved, and the system damping is effectively increased.
3) Numerical simulation analysis shows that the edge of the heave plate after corner cutting is thinned, so that the probability of mutual impact action of falling vortexes at the upper edge and the lower edge is increased, and energy is dissipated in the impact process, so that the damping can be increased; in addition, the contact surface area of the heave plate after the corner cutting and water is increased, more water can be driven to move, and therefore the additional mass and the viscous damping are increased.
4) According to the invention, the overall size of the heave plate is increased, the thickness of the middle part of the heave plate is increased, and particles are filled in the heave plate, so that the heave plate has larger self weight compared with the traditional heave plate, and the additional mass can be increased.
5) According to the invention, the addition of the internal reinforcing truss provides a solution with higher structural efficiency for ensuring the structural safety of the heave plate.
Drawings
FIG. 1 is an elevational view of a combination electromagnetic induction and particle damping heave plate in accordance with the present invention;
FIG. 2 is a side elevational view of the combination electromagnetic induction and particle damping heave plate of the present invention;
FIG. 3 is a top view of the combined electromagnetic induction and particle damping heave plate of the present invention;
reference numbers in the figures: 1 is a heave plate cavity shell, 2 is a reinforced truss, 3 is particles, 4 is a particle outer sleeve, and 5 is a buffer material.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
As shown in fig. 1 to 3, an embodiment of a heave plate combining electromagnetic induction and particle damping according to the present invention mainly includes a heave plate cavity housing 1, a reinforcing truss 2, particles 3, a particle outer sleeve 4 and a buffer material 5.
The heave plate cavity shell 1 is a chamfer cuboid cavity formed by welding steel plates with the thickness of 8-30mm, is fixed on a main structure of an ocean platform in a certain mode and is positioned at a certain depth below the ocean platform. The reinforced truss 2 is erected between the upper surface and the lower surface inside the heave plate to serve as a vertical support of the structure, the manufacture and erection are completed before the cavity shell 1 of the heave plate is sealed, the reinforced truss is composed of section steel or cold-bending thin-walled steel rod pieces, and the specific form, the size and the distance of the truss are determined according to the structure reliability calculation result. The particle outer sleeve 4 is an independently formed copper hollow cylinder, the inner diameter is 20-200mm, the thickness is 4-20mm, the specific size is optimized according to the overall size of the heave plate, and the particle outer sleeve is arranged in the inner space of the cavity before the outer shell 1 of the heave plate cavity is sealed and does not collide or overlap with the reinforcing truss 2. The particles 3 are spherical permanent magnets, and are also injected into the particle outer sleeve 4 before the heave plate cavity housing 1 is closed, wherein the diameter of the particle outer sleeve 4 is 2mm-50mm and is not larger than the inner diameter of the particle outer sleeve 4 correspondingly injected. The inner side of the cavity shell 1 of the heave plate is pasted with a buffer material 5 (such as one or more of rubber, foam plastic or knitting cotton with the thickness of 5 mm).
Claims (6)
1. The utility model provides a combination electromagnetic induction and damped board of dangling of granule, by dangling board cavity shell (1), strengthening truss (2), granule (3), granule outer tube (4) and buffer material (5) and constitute characterized by: the heave plate cavity shell (1) is a hollow cuboid or cylindrical shell with a corner cut edge; the reinforcing truss (2) is positioned in the heave plate cavity shell (1), the top of the reinforcing truss (2) is connected with the top of the inner wall of the heave plate cavity shell (1), the bottom of the reinforcing truss (2) is connected with the bottom of the inner wall of the heave plate cavity shell (1), and the reinforcing truss (2) provides structural support for the heave plate cavity shell (1); a particle outer sleeve (4) is arranged in the residual space inside the cavity shell (1) of the heave plate, and the particle outer sleeve (4) is a hollow cylinder with a vertical bus; each particle outer sleeve (4) is filled with a particle (3); the inner wall surface of the heave plate cavity shell (1) is covered with a buffer material (5); under the structural vibration generated by wind or wave random load, the kinetic energy of the structure is converted and dissipated by viscous damping generated by the movement of peripheral water flow driven by the heave plate, the energy dissipation generated by the falling and impacting probability of outer-side vortexes is increased by thinning the edge cut angle, the energy conversion consumption formed by electromagnetic induction caused by the relative motion of the particle outer sleeve and the inner particles and the energy dissipation generated by the collision of the particles and the boundary, the structural damping is increased, the inherent cycle of the structure is increased by the additional particle, the heave motion of the semi-submersible ocean platform is effectively inhibited, and the service performance of the ocean platform is improved.
2. The heave plate combining electromagnetic induction and particle damping according to claim 1, wherein: the edge thickness of the heave plate cavity shell (1) is not more than 1m, and the included angle between the edge chamfer inclined plane and the horizontal plane is 30-60 degrees.
3. The heave plate combining electromagnetic induction and particle damping according to claim 1, wherein: the reinforced truss (2) is made of section steel.
4. The heave plate combining electromagnetic induction and particle damping according to claim 1, wherein: the particles (3) are spherical permanent magnets, the diameter of each permanent magnet is 2-50 mm, and the diameter of each permanent magnet is smaller than the inner diameter of the particle outer sleeve (4).
5. The heave plate combining electromagnetic induction and particle damping according to claim 1, wherein: the particle outer sleeve (4) is made of a non-magnetic electric conductor with a certain resistance.
6. The heave plate combining electromagnetic induction and particle damping according to claim 1, wherein: the buffer material (5) is any one or more of rubber, foam plastic or knitted cotton.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810319083.9A CN108560523B (en) | 2018-04-11 | 2018-04-11 | Heave plate combining electromagnetic induction and particle damping |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810319083.9A CN108560523B (en) | 2018-04-11 | 2018-04-11 | Heave plate combining electromagnetic induction and particle damping |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108560523A CN108560523A (en) | 2018-09-21 |
| CN108560523B true CN108560523B (en) | 2020-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810319083.9A Expired - Fee Related CN108560523B (en) | 2018-04-11 | 2018-04-11 | Heave plate combining electromagnetic induction and particle damping |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109606557B (en) * | 2018-11-06 | 2020-10-02 | 同济大学 | Particle damping three-way stabilizing plate combined with electromagnetic induction |
| CN112324832A (en) * | 2020-09-21 | 2021-02-05 | 海洋石油工程股份有限公司 | Fluid damping generation plate and fluid damping generation device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101774424B (en) * | 2010-03-19 | 2012-04-25 | 天津大学 | Deep-sea Truss Spar platform heave plate |
| US8444347B2 (en) * | 2010-08-03 | 2013-05-21 | Technip France | Truss heave plate system for offshore platform |
| CN102817423B (en) * | 2012-09-11 | 2015-02-18 | 同济大学 | Buffer-type suspension-type particle tuning quality damper |
| CN203211499U (en) * | 2013-03-29 | 2013-09-25 | 徐哲 | Novel offshore semi-submersible drilling platform |
| CN103498884B (en) * | 2013-10-08 | 2015-12-23 | 同济大学 | Suspension type multi-unit impact damper |
| CN206256734U (en) * | 2016-12-06 | 2017-06-16 | 山东大学 | Eddy current damper damping control device |
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| CN108560523A (en) | 2018-09-21 |
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