CN114435540B - Multiband dynamic cable system and design method - Google Patents
Multiband dynamic cable system and design method Download PDFInfo
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- CN114435540B CN114435540B CN202210069652.5A CN202210069652A CN114435540B CN 114435540 B CN114435540 B CN 114435540B CN 202210069652 A CN202210069652 A CN 202210069652A CN 114435540 B CN114435540 B CN 114435540B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/20—Adaptations of chains, ropes, hawsers, or the like, or of parts thereof
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
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- G06F30/17—Mechanical parametric or variational design
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- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/20—Adaptations of chains, ropes, hawsers, or the like, or of parts thereof
- B63B2021/203—Mooring cables or ropes, hawsers, or the like; Adaptations thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/20—Adaptations of chains, ropes, hawsers, or the like, or of parts thereof
- B63B2021/206—Weights attached to mooring lines or chains, or the like; Arrangements thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
- B63B2021/505—Methods for installation or mooring of floating offshore platforms on site
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Abstract
The invention discloses a multiband dynamic cable system which comprises a floating body mechanism arranged on the sea in a floating mode and a submarine cable connected with the floating body mechanism, wherein at least two buoyancy assemblies are arranged on the submarine cable, a gravity assembly is arranged between the two buoyancy assemblies, each buoyancy assembly comprises a plurality of buoyancy blocks, each gravity assembly comprises a plurality of gravity blocks, the buoyancy assemblies and the gravity assemblies are arranged at intervals, the buoyancy blocks stretch the submarine cable upwards, and the gravity blocks stretch the submarine cable downwards, so that the submarine cable is arranged in a wave shape and at least has two wave shapes. The invention provides a multiband dynamic cable system and a design method, so that a dynamic cable has a larger floating segment length in limited water depth, and the large offset requirement of a platform is met.
Description
Technical Field
The invention relates to the technical field of cables, in particular to a multiband dynamic cable system and a design method.
Background
With the continuous development, construction and utilization of ocean resources such as ocean oil and gas resources, offshore wind power and the like, submarine cables, particularly photoelectric composite submarine cables, are increasingly applied to offshore platform systems as important channels for information and energy transmission.
The floating platform or the floating wind turbine need to be connected through a dynamic cable, the conventional dynamic cable line type mostly adopts a slow wave type, the slow wave type is that a proper amount of distributed buoyancy blocks are installed on the basis of a catenary line type, and the buoyancy provided by the buoyancy blocks enables the dynamic cable to float locally to present a single-wave shape. The gentle wave type floating area enables the dynamic cable to generate length allowance, so that the dynamic cable is not broken when moving along with the upper floating body, waves and ocean currents, the stress condition of a suspension point and a contact point of the dynamic cable is effectively improved, and the fatigue life of the dynamic cable is prolonged.
However, the conventional slow wave type is not suitable for the case where the water depth is shallow and the floating body offset is large. Because when taking place the biggest skew in order to satisfy the body, the cable is not broken by the stretch, and the developments cable need possess sufficient length allowance, the high enough region that floats promptly, but floats the regional too high, can take place the condition that the line type floated the surface of water, and developments cable and buoyancy piece emerge the surface of water and will accelerate the ageing of material to have the potential safety hazard.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the multiband dynamic cable system and the design method are provided, so that the dynamic cable has a larger floating section length in a limited water depth, and the large offset requirement of a platform is met.
In order to achieve the above object, the present invention provides the following technical solutions.
A multiband dynamic cable system comprises a floating body mechanism arranged on the sea in a floating mode and a submarine cable connected with the floating body mechanism, wherein at least two buoyancy assemblies are arranged on the submarine cable, a gravity assembly is arranged between the two buoyancy assemblies, each buoyancy assembly comprises a plurality of buoyancy blocks, each gravity assembly comprises a plurality of gravity blocks, the buoyancy assemblies and the gravity assemblies are arranged at intervals, the buoyancy blocks stretch the submarine cable upwards, and the gravity blocks stretch the submarine cable downwards, so that the submarine cable is in a wave shape and at least has two wave shapes.
The invention has the beneficial effects that: according to the dynamic cable system, the buoyancy blocks and the gravity blocks are arranged on the submarine cable at intervals, so that the submarine cable can be arranged in a wave shape when laid and has two wave shapes, when the floating body mechanism is arranged in a floating mode, the submarine cable has a larger floating section length in a limited water depth, the requirement of the floating body mechanism for large deviation is met, the submarine cable is prevented from being pulled apart, the stress conditions of a suspension point and a contact point of the submarine cable are effectively improved, and the fatigue life of the submarine cable is prolonged.
As an improvement of the invention, an anti-collision ring is further arranged at one end of the submarine cable connected with the floating body mechanism, and the anti-collision ring is fixed on the submarine cable through a binding structure.
As an improvement of the present invention, the design process of the crash-proof ring includes: modeling is carried out in ORCAFLEX by adopting a line in line method, the anti-collision rings are surrounded in a submarine cable collision area, the outer diameter, the length, the Young modulus, the spacing distance and the number of the anti-collision rings are input, dynamic overall analysis is carried out, if the collision point is between the two anti-collision rings, the distance of the anti-collision rings needs to be reduced, and the number of the anti-collision rings is increased; if the collision point is on the anti-collision ring, but the stress concentration still occurs on the submarine cable body, the outer diameter of the anti-collision ring needs to be increased, and the Young modulus needs to be reduced; if the submarine cable in the area where the anti-collision ring is additionally installed deforms and the load is overlarge, the outer diameter of the anti-collision ring needs to be reduced, and the length of the anti-collision ring needs to be reduced.
As an improvement of the invention, the sea cable anchoring device further comprises an anchoring structure for fixedly connecting the sea cable with the floating body mechanism, wherein the anchoring structure comprises an anchoring base and a clamping assembly arranged on the anchoring base and used for clamping and fixing the sea cable, a first through hole for the sea cable to pass through is formed in the anchoring base, a second through hole for the sea cable to pass through and communicated with the first through hole is formed in the clamping assembly, an outer reaming hole positioned between the first through hole and the second through hole is further formed in the anchoring base, the outer reaming hole is coaxially arranged with the first through hole, and the diameter of the outer reaming hole is larger than that of the first through hole; and after the submarine cable passes through the first through hole and the second through hole, a cavity for injecting glue is formed between the outer expanded hole and the submarine cable.
As an improvement of the invention, the anchoring base is further provided with a peripheral shell body sleeved on the clamping assembly, and when the clamping assembly clamps and clamps the armor steel wire of the submarine cable, a glue filling space for filling glue is formed between the shell body and the armor steel wire of the submarine cable.
A design method of the multiband dynamic cable system comprises the following steps:
s1, constructing a dynamic cable initial linear finite element model, selecting initial linear shapes of a buoyancy block and a gravity block according to environmental conditions and section information of a dynamic cable, and entering a step S2;
s2, performing static overall analysis on the dynamic cable, and if the static response meets the requirement, entering step S3, and if the static response does not meet the requirement, entering step S1, and updating parameters of the buoyancy block and the gravity block;
s3, carrying out dynamic integral analysis on the dynamic cable, and if the dynamic response meets the requirements, entering the step S4, and if the dynamic response does not meet the requirements, entering the step S1, and updating parameters of the buoyancy block and the gravity block;
s4, performing dynamic cable fatigue analysis, and if the fatigue life meets the requirement, entering a step S5, and if the fatigue life does not meet the requirement, entering a step S1, and updating parameters of the buoyancy block and the gravity block;
and S5, determining the final design.
As a modification of the present invention, in step S1, the following steps are specifically included:
s101, inputting environmental conditions of a sea area where the dynamic cable is located, including water depth, wave height, period and flow speed, into ORCAFLEX software; inputting floating body motion parameters including basic size, gravity center position, anchor chain parameters and response amplitude operators; dynamic cable cross-sectional parameters including outer diameter, weight, stiffness;
s102, selecting related parameters of an initial distributed buoyancy block and a distributed gravity block based on the input, wherein the related parameters comprise net buoyancy, net gravity, size, quantity, spacing distance and distribution position;
s103, constructing an initial linear type with reasonable distribution, wherein the highest point of the linear type does not float out of the water surface, the lowest point of the linear type does not contact with the seabed, and the length of the dynamic cable is not less than the linear length of the catenary and the maximum offset distance of the floating body.
As a modification of the present invention, in step S2, the following steps are specifically included:
s201, under the conditions that environmental loads are not loaded and the motion of a floating body is not considered, the tension and curvature distribution condition of the dynamic cable under the static condition is analyzed, if the top tension is overlarge, the number of balancing weights in a wave trough area is reduced or the number of floating blocks in a wave crest area is increased, and if the curvature of a gravity block or a buoyancy block area is overlarge, the weight of a single gravity block or the net buoyancy of the floating blocks is reduced or the number of the gravity blocks or the number of the buoyancy blocks is increased;
s202, the floating body is moved to the maximum offset position of the near position and the far position, and if the linear straightening and the excessive tension are generated under the far position working condition, the length of the cable in the floating area needs to be increased, namely the total buoyancy is increased.
As a modification of the present invention, in step S202, the increasing of the total buoyancy specifically includes increasing the buoyancy of the floating block region on the existing two waveforms, and increasing the interval between the waveforms.
As an improvement of the invention, when the buoyancy of the floating block area on the two existing waveforms is increased and the interval between the waveforms is increased, the phenomenon that the water flows out linearly or touches the ground or the curvature is too small under the near-position working condition occurs, and then one waveform is added.
As a modification of the present invention, in step S3, the following steps are specifically included:
s301, loading limit working condition combinations according to reference specifications, and judging whether the tension on the dynamic cable and the corresponding curvature meet the requirements of the section tension and curvature capacity curve of the dynamic cable; if not, the parameters of the buoyancy block and the gravity block need to be adjusted.
As a modification of the present invention, in step S4, the following steps are specifically included:
s401, carrying out fatigue analysis on the line type determined in the step S3, loading all fatigue working conditions, and carrying out linear superposition on fatigue damage under all working conditions, wherein the fatigue life is not less than the design fatigue life requirement; if not, the positions of the buoyancy block and the gravity block need to be adjusted again.
Drawings
Fig. 1 is a schematic view of the overall structure of the dynamic cable system of the present invention.
Fig. 2 is a schematic view of the overall structure of the anchoring structure of the present invention.
Fig. 3 is a schematic cross-sectional structure of fig. 2 of the present invention.
Fig. 4 is a schematic view of the anchoring base structure of the present invention.
FIG. 5 is a schematic view of the hold-down block structure of the present invention.
Fig. 6 is a schematic view of the anchoring structure of the present invention in cooperation with a sea cable.
FIG. 7 is a block diagram of a design process flow of the present invention.
In the figure, 1, a floating body mechanism; 2. a sea cable; 2.1, armouring steel wires; 3. a bend preventer; 4. a gravity block; 5. A buoyancy block; 6. an anchoring structure; 6.1, anchoring a base; 6.1.1, a first cross-over hole; 6.1.2, boss; 6.1.3, externally expanding the hole; 6.2, briquetting; 6.2.1, a second cross-over hole; 6.2.2, ring grooves; 6.3, a reinforcing block; 6.3.1, a third cross-connecting hole; 6.4, a shell; 6.4.1, installing a cavity; 7. a fixing mechanism; 8. an anti-collision ring.
Detailed Description
The invention is further explained with reference to the drawings.
Referring to fig. 1 to 6, a multiband dynamic cable system includes a floating body mechanism 1 that is arranged on the sea in a floating manner, a submarine cable 2 connected to the floating body mechanism 1 through an anchoring structure 6, and a fixing structure that fixes the submarine cable 2 to the sea bed, in this embodiment, the floating body mechanism 1 is a wind power generation device, two or more buoyancy modules and gravity modules are arranged on the submarine cable 2, each buoyancy module includes a plurality of buoyancy blocks 5, each gravity module includes a plurality of gravity blocks 4, a gravity module is arranged between two buoyancy modules, the buoyancy modules and the gravity modules are arranged at intervals, the buoyancy blocks 5 stretch the submarine cable 2 upwards, and the gravity blocks 4 stretch the submarine cable 2 downwards, so that the submarine cable 2 is arranged in a wave shape, and has at least two wave shapes.
Due to the complexity of the form and application environment of the floating body mechanism 1, the submarine cable 2 may collide with the floating body mechanism 1, and in this case, the distributed anti-collision ring 8 needs to be installed in the region where collision is likely to occur, so as to avoid the damage caused by stress concentration at the part where the submarine cable 2 collides. And an anti-collision ring 8 is further arranged at one end of the submarine cable 2 connected with the floating body mechanism 1, and the anti-collision ring 8 is fixed on the submarine cable 2 through a binding structure. Distributed anticollision ring 8 is the PU material, and the haversian form is fixed on the cable through the ligature structure, but anticollision ring 8 effective absorption impact energy protects dynamic cable structure.
Specifically, the design process of the impact ring 8 includes: modeling is carried out in ORCAFLEX by adopting a line in line method, the anti-collision ring 8 surrounds the collision area of the submarine cable 2, the outer diameter, the length, the Young modulus, the spacing distance and the number of the anti-collision ring 8 are input, dynamic overall analysis is carried out, if the collision point is between the two anti-collision rings 8, the distance of the anti-collision ring 8 needs to be reduced, and the number of the anti-collision rings 8 is increased; if the collision point is on the anti-collision ring 8, but the stress concentration still occurs on the submarine cable 2 body, the outer diameter of the anti-collision ring 8 needs to be increased, and the Young modulus needs to be reduced; if the submarine cable 2 is deformed and the load is overlarge in the area where the anti-collision ring 8 is additionally installed, the outer diameter of the anti-collision ring 8 needs to be reduced, and the length of the anti-collision ring 8 needs to be reduced.
As shown in fig. 2 to 6, the anchoring structure 6 includes an anchoring base 6.1 and a clamping assembly disposed on the anchoring base 6.1 for clamping and fixing the submarine cable 2. Be equipped with the first cross bore 6.1.1 that supplies submarine cable 2 to pass on the anchor base 6.1, the size of first cross bore 6.1.1 and submarine cable 2's size looks adaptation, the upper end of anchor base 6.1 is equipped with the protrusion and is formed with the lug that is the cavity setting, the inner wall of boss 6.1.2 is formed with outer reaming hole 6.1.3, the diameter of outer reaming hole 6.1.3 is greater than the diameter of first cross bore 6.1.1 to outer reaming hole 6.1.3 and the coaxial setting of first cross bore 6.1.1.
Still fixed mounting has casing 6.4 that is the cavity setting on anchor base 6.1, and casing 6.4 includes that the half shell butt joint of two half tube-shapes is assembled and is formed, and two half shells pass through screw fixed mounting on anchor base 6.1, simple to operate, two form installation cavity 6.4.1 between the half shell, boss 6.1.2 is located installation cavity 6.4.1 to form the chamber that holds that is used for pouring into glue between installation cavity 6.4.1 and the boss 6.1.2. The clamping assembly comprises a pressing block 6.2 and a reinforcing block 6.3 arranged on the pressing block 6.2, the reinforcing block 6.3 and the pressing block 6.2 are fixedly arranged on the boss 6.1.2 through fasteners, the reinforcing block 6.3 and the pressing block 6.2 are located in the installation cavity 6.4.1, a second cross connection hole 6.2.1 for the sea cable 2 to pass through is arranged on the pressing block 6.2, the reinforcing block 6.3 is provided with a third cross connection hole 6.3.1, the third cross connection hole 6.3.1 and the second cross connection block are arranged coaxially, the third cross connection hole 6.3.1 and the second cross connection hole 6.2.1 are arranged coaxially with the first cross connection hole 6.1.1, and the third cross connection hole 6.3.1, the second cross connection hole 6.2.1, the outer cross connection hole 6.1.3 and the first cross connection hole 6.1.1 are arranged sequentially from top to bottom. When the submarine cable 2 is laid, the submarine cable sequentially passes through the first through hole 6.1.1, the outer expanded hole 6.1.3, the second through hole 6.2.1 and the third through hole 6.3.1, and a cavity is formed between the outer expanded hole 6.1.3 and the submarine cable 2.
The utility model provides an anchor structure 6, through setting up outer reaming hole 6.1.3, submarine cable 2 is when laying, pass first cross bore 6.1.1 in proper order, outer reaming hole 6.1.3 and second cross bore 6.2.1, through setting up the great outer reaming 6.1.3 of diameter, submarine cable 2's armor steel wire 2.1 is compressing tightly the back, be formed with the cavity between outer reaming hole 6.1.3 and the submarine cable 2, resin glue is poured into through outside reaming 6.1.3's cavity, constitute whole circle armor steel wire 2.1 into a whole, single armor steel wire 2.1 atress is inhomogeneous, and the easy tired problem under the dynamic load of wave current, and simultaneously to holding intracavity pouring resin glue, further strengthen armor steel wire 2.1's intensity, guarantee that single armor steel wire 2.1 accepts evenly, avoid single armor steel wire 2.1 to break because of the atress is too big, and can be according to the number of piles of layers of armor 2.1 steel wire on submarine cable 2.1 steel wire 2, select reinforcing block 6.3.3, only need to compress tightly briquetting 2.1.1 when this moment on the armor steel wire 2 boss of installation 2.1, armor steel wire 2 boss 2, it can be 2.1 to press down the boss on another layer of armor steel wire 2.1.1 to press 6.2 to install briquetting, only 2.2 to be the briquetting, armor steel wire boss, only 2 boss, it can be 2 to press 6.1 to press 6.2 to be between the briquetting 2.2.2 to be the briquetting, the briquetting 2 boss, only 2 boss of armor steel wire boss, the briquetting 2 boss, it can be pressed between the briquetting 2 boss of the briquetting 2 to install when the briquetting 2.1.2 boss, the briquetting 2 boss, the briquetting 2 boss, only 2 boss, the briquetting 2 boss of armor steel wire boss of the briquetting 2 boss of the briquetting on the briquetting, the briquetting 2 boss of the briquetting 2.2 boss of another layer when the briquetting 2.1.1.1.1.1 to install.
In addition, briquetting 6.2 with the terminal surface that boss 6.1.2 contacted is formed with the annular 6.2.2 of a plurality of coaxial settings, when briquetting 6.2 installed on boss 6.1.2, briquetting 6.2 contacted through the up end of spout with boss 6.1.2, increased coefficient of friction, has solved the problem that armor steel wire 2.1 was easy to be slipped under dynamic load, and reducing wear, the cross-section of annular 6.2.2 is the V-arrangement, in the aspect of the processing, and coefficient of friction is higher moreover.
The submarine cable 2 is connected with the floating body through the bending prevention device 3, and is fixed to a joint on the floating body mechanism 1 through the connection form of the bolt flange, so that smooth transition is realized at the rigid-to-flexible connection position of the suspension point of the dynamic cable.
The buoyancy block 5 includes a clamp portion for fixing with the sea cable 2, a floating body portion for providing buoyancy, and a connection member for connecting the clamp portion and the floating body portion.
The gravity block 4 comprises two weight blocks arranged on two sides of the submarine cable 2 and a fastener for connecting the two weight blocks, the submarine cable 2 is clamped tightly through the two weight blocks, and a sacrificial anode used for corrosion prevention is further arranged on the gravity block 4.
According to the dynamic cable system, the buoyancy blocks 5 and the gravity blocks 4 are arranged on the submarine cable 2 at intervals, so that the submarine cable 2 can be arranged in a wave shape when laid and has two wave shapes, when the floating body mechanism 1 is arranged in a floating mode, the submarine cable 2 has a larger floating section length in a limited water depth, the requirement of large deviation of the floating body mechanism 1 is met, the submarine cable 2 is prevented from being pulled apart, the stress conditions of a cable suspension point and a contact point of the submarine cable 2 are effectively improved, and the fatigue life of the submarine cable 2 is prolonged.
Referring to fig. 7, the invention also discloses a design method of the multiband dynamic cable system, which comprises the following steps:
s1, constructing a dynamic cable initial linear finite element model, and selecting initial linear shapes of a buoyancy block 5 and a gravity block 4 according to environmental conditions and section information of a dynamic cable, wherein the method specifically comprises the following steps:
s101, inputting environmental conditions of a sea area where the dynamic cable is located, including water depth, wave height, period and flow speed, into ORCAFLEX software; inputting floating body motion parameters including a basic size, a gravity center position, anchor chain parameters and a response amplitude operator; dynamic cable cross-sectional parameters including outer diameter, weight, stiffness;
s102, based on the input, selecting relevant parameters of the initial distributed buoyancy block 5 and the distributed gravity block 4, wherein the relevant parameters comprise net buoyancy, net gravity, size, quantity, spacing distance and distribution position;
s103, constructing an initial line type with reasonable distribution, wherein the highest point of the line type does not float out of the water, the lowest point of the line type does not contact with the seabed, and the length of the dynamic cable is not less than the length of the catenary line type plus the maximum offset distance of the floating body. Entering step S2;
s2, performing static overall analysis on the dynamic cable, entering a step S3 if the static response meets the requirement, and entering a step S1 if the static response does not meet the requirement, and updating parameters of the buoyancy block 5 and the gravity block 4; the method specifically comprises the following steps:
s201, under the conditions that environmental loads are not loaded and floating body movement is not considered, the tension and curvature distribution conditions of the dynamic cable under the static condition are analyzed, if the top tension is overlarge, the number of balancing weights in a wave trough area is reduced or the number of floating blocks in a wave crest area is increased, if the curvature of a gravity block 4 or a buoyancy block 5 area is overlarge, the weight of a single gravity block 4 or the net buoyancy of the floating blocks is reduced, or the number of the gravity blocks 4 or the number of the buoyancy blocks 5 is increased, namely when the curvature of the gravity block 4 or the buoyancy block 5 area is overlarge, one or more modes of reducing the weight of the single gravity block 4, the net buoyancy of the floating blocks, increasing the number of the gravity blocks 4 and the number of the buoyancy blocks 5 can be selected, and debugging is carried out in such a way;
s202, the floating body is moved to the maximum offset position of the near position and the far position, and if the linear straightening and the excessive tension are generated under the far position working condition, the length of the cable in the floating area needs to be increased, namely the total buoyancy is increased. The method for increasing the total buoyancy specifically comprises two modes of increasing the buoyancy of a floating block area on two existing waveforms, increasing the interval between the waveforms at the same time, and increasing one waveform.
When the buoyancy of the floating block area on the two existing waveforms is increased by the method a and the interval between the waveforms is increased, the phenomenon that the water flows out linearly or touches the ground or the curvature is too small under the near working condition occurs, and the method b is selected to increase one waveform.
S3, carrying out dynamic integral analysis on the dynamic cable, and if the dynamic response meets the requirement, entering the step S4, and if the dynamic response does not meet the requirement, entering the step S1, and updating parameters of the buoyancy block 5 and the gravity block 4; specifically, the method comprises the following steps:
s301, loading limit working condition combinations according to reference specifications, wherein the working conditions comprise that the wave is met once in 100 years, the ocean current is met once in 10 years, the wave is met once in 10 years, the ocean current is met once in 100 years, and 1 anchor chain of the floating body is broken.
Judging whether the tension on the dynamic cable and the corresponding curvature meet the requirements of the section tension and curvature capacity curve of the dynamic cable; if not, the parameters of the buoyancy block 5 and the gravity block 4 need to be adjusted.
S4, performing dynamic cable fatigue analysis, if the fatigue life meets the requirement, entering a step S5, and if the fatigue life does not meet the requirement, entering a step S1, and updating parameters of the buoyancy block 5 and the gravity block 4; the method specifically comprises the following steps:
s401, performing fatigue analysis on the line type determined in the step S3, loading all fatigue working conditions, and performing linear superposition on fatigue damage under all working conditions, wherein the fatigue life is not less than the design fatigue life requirement; if the position of the buoyancy block 5 and the position of the gravity block 4 are not satisfied, the positions of the buoyancy block 5 and the gravity block are required to be adjusted again.
And S5, determining the final design.
The above description is only a preferred embodiment of the present invention, and all equivalent changes or modifications of the structure, characteristics and principles described in the present patent application are included in the present patent application.
Claims (4)
1. A multiband dynamic cable system comprises a floating body mechanism arranged on the sea in a floating mode and a submarine cable connected with the floating body mechanism, and is characterized in that: the submarine cable is provided with at least two buoyancy assemblies, a gravity assembly is arranged between the two buoyancy assemblies, each buoyancy assembly comprises a plurality of buoyancy blocks, each gravity assembly comprises a plurality of gravity blocks, the buoyancy assemblies and the gravity assemblies are arranged at intervals, the buoyancy blocks stretch the submarine cable upwards, and the gravity blocks stretch the submarine cable downwards, so that the submarine cable is arranged in a wave shape and at least has two wave shapes; one end that submarine cable and body mechanism are connected still is equipped with the anticollision ring, and the anticollision ring passes through the ligature structure to be fixed on the submarine cable, the design process of anticollision ring includes: modeling is carried out in ORCAFLEX by adopting a line in line method, the anti-collision rings are surrounded in a submarine cable collision area, the outer diameter, the length, the Young modulus, the spacing distance and the number of the anti-collision rings are input, dynamic overall analysis is carried out, if the collision point is between the two anti-collision rings, the distance of the anti-collision rings needs to be reduced, and the number of the anti-collision rings is increased; if the collision point is on the anti-collision ring, but the stress concentration still occurs on the submarine cable body, the outer diameter of the anti-collision ring needs to be increased, and the Young modulus needs to be reduced; if the sea cable in the area where the anti-collision ring is installed is deformed and the load is overlarge, the outer diameter of the anti-collision ring needs to be reduced, the length of the anti-collision ring needs to be reduced, and the design method of the multiband dynamic cable system comprises the following steps:
s1, constructing a dynamic cable initial linear finite element model, selecting initial linear shapes of a buoyancy block and a gravity block according to environmental conditions and section information of a dynamic cable, and entering a step S2;
s2, performing static overall analysis on the dynamic cable, entering a step S3 if the static response meets the requirement, and entering a step S1 if the static response does not meet the requirement, and updating parameters of the buoyancy block and the gravity block;
the method specifically comprises the following steps: s201, under the conditions that environmental loads are not loaded and the motion of a floating body is not considered, the tension and curvature distribution condition of the dynamic cable under the static condition is analyzed, if the top tension is overlarge, the number of balancing weights in a wave trough area is reduced or the number of floating blocks in a wave crest area is increased, and if the curvature of a gravity block or a buoyancy block area is overlarge, the weight of a single gravity block or the net buoyancy of the floating blocks is reduced or the number of the gravity blocks or the number of the buoyancy blocks is increased;
s202, moving the floating body to the maximum offset position of the near position and the far position, if the linear straightening and the tension are overlarge under the far position working condition, increasing the length of a cable in a floating area, namely increasing the total buoyancy, wherein the method for increasing the total buoyancy specifically comprises increasing the buoyancy of a floating block area on two existing waveforms and increasing the interval between the waveforms;
s3, carrying out dynamic integral analysis on the dynamic cable, and if the dynamic response meets the requirement, entering the step S4, and if the dynamic response does not meet the requirement, entering the step S1, and updating parameters of the buoyancy block and the gravity block;
the method specifically comprises the following steps: s301, loading limit working condition combinations according to reference specifications, and judging whether the tension on the dynamic cable and the corresponding curvature meet the requirements of a dynamic cable section tension and curvature capability curve; if not, parameters of the buoyancy block and the gravity block need to be adjusted;
s4, performing dynamic cable fatigue analysis, if the fatigue life meets the requirement, entering a step S5, and if the fatigue life does not meet the requirement, entering a step S1, and updating parameters of the buoyancy block and the gravity block;
and S5, determining the final design.
2. A multiband dynamic cable system according to claim 1, wherein: in step S1, the method specifically includes the following steps:
s101, inputting environmental conditions of a sea area where the dynamic cable is located, including water depth, wave height, period and flow speed, into ORCAFLEX software; inputting floating body motion parameters including a basic size, a gravity center position, anchor chain parameters and a response amplitude operator; dynamic cable cross-sectional parameters including outer diameter, weight, stiffness;
s102, based on the input, selecting relevant parameters of an initial distributed buoyancy block and a distributed gravity block, wherein the relevant parameters comprise net buoyancy, net gravity, size, quantity, spacing distance and distribution position;
s103, constructing an initial line type with reasonable distribution, wherein the highest point of the line type does not float out of the water, the lowest point of the line type does not contact with the seabed, and the length of the dynamic cable is not less than the length of the catenary line type plus the maximum offset distance of the floating body.
3. The multiband dynamic cable system of claim 1, wherein: when the buoyancy of the floating block area on the existing two waveforms is increased and the interval between the waveforms is increased, the phenomenon that water flows out linearly or the water touches the ground or the curvature is too small under the near working condition occurs, and one waveform is added.
4. The multiband dynamic cable system of claim 1, wherein: in step S4, the method specifically includes the following steps: s401, carrying out fatigue analysis on the line type determined in the step S3, loading all fatigue working conditions, and carrying out linear superposition on fatigue damage under all working conditions, wherein the fatigue life is not less than the design fatigue life requirement; if not, the positions of the buoyancy block and the gravity block need to be adjusted again.
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