Vibration reduction connecting joint of tension leg type floating platform and anchor chain and implementation method of vibration reduction connecting joint

Abstract

The invention discloses a vibration reduction connecting joint of a tension leg type floating platform and an anchor chain and an implementation method of the vibration reduction connecting joint. The vibration reduction connecting joint comprises an annular hydraulic adjusting base with a top plate and a bottom plate, the top plate is fixed to the bottom of a floating barrel connecting steel plate, and a plurality of hydraulic jacks are arranged between the top plate and the bottom plate; a plurality of shape memory alloy dampers are arranged between the bottom plate and the connecting lug plate below the bottom plate, and the surfaces of the shape memory alloy dampers are sleeved with damper damping shells made of graphene aerogel composite materials. The anchor chain is connected with the connecting lug plate through a spherical hinge joint; the problem of fatigue damage of the anchor chain is relieved through the double damping effects of the damper and the damping shell in combination with the displacement compensation function of the spherical hinge joint. During specific implementation, vibration reduction connection node model selection is conducted through the stability index and the vibration reduction performance index, then during service, the height of the bottom plate is adjusted through stretching and retracting of the hydraulic jack, the vibration reduction performance index is made to be higher than a threshold value, the tension of the tension legs is indirectly adjusted, and the overall stability of the platform is improved.

Description

Technical Field

[0001] The present invention relates to marine foundation engineering, and particularly to a vibration damping connection node between a tension leg type floating platform and an anchor chain and an implementation method thereof. Background Art

[0002] The tension leg type floating platform (TLP) is one of the most widely used floating foundations for offshore wind power. Its core advantage lies in that it can maintain a high degree of stability by being anchored to the seabed through a tension leg system, and is particularly suitable for waters with a water depth exceeding 500 meters. The TLP is usually connected to the lower anchor chain through a fairlead. In practical applications, due to the action of wind, wave and current on the TLP, the anchor chain will be subjected to long-term micro-amplitude load effects, resulting in an increased risk of fatigue fracture of the anchor chain, which limits the application of the TLP. Summary of the Invention

[0003] Object of the Invention: The first object of the present invention is to provide a vibration damping connection node between a tension leg type floating platform and an anchor chain for the problem of fatigue damage of the anchor chain caused by the action of wind, wave and current on the TLP; the second object of the present invention is to provide an implementation method of the vibration damping connection node to ensure the overall stability of the TLP.

[0004] Technical Solution: A vibration damping connection node between a tension leg type floating platform and an anchor chain of the present invention includes an annular hydraulic adjustment base having a top plate and a bottom plate. The top plate is fixed to the bottom of the floating drum connection steel plate. A connecting ear plate is provided below the bottom plate. A plurality of shape memory alloy dampers are evenly arranged along the circumferential direction between the bottom plate and the connecting ear plate. A damper shock absorption housing is sleeved on the surface of the shape memory alloy damper. Both ends of the damper shock absorption housing are fixed to the bottom plate and the connecting ear plate respectively by a modified epoxy resin glue; the damper shock absorption housing is made of a graphene aerogel composite material; the anchor chain is connected to the connecting ear plate through a spherical hinge joint.

[0005] Further, the rotation angle |θ| of the spherical hinge joint ≤ 15°; a self-lubricating spherical plain bearing and a tungsten alloy wear-resistant bushing are arranged inside the spherical hinge joint. The friction coefficient of the self-lubricating spherical plain bearing < 0.08, and the hardness of the tungsten alloy wear-resistant bushing is HRC62 ± 2.

[0006] Further, a sacrificial anode block is arranged at the bottom of the bottom plate, and the material is aluminum alloy AZ63. The sacrificial anode block can provide long-term cathodic protection and effectively prevent the electrochemical corrosion of the metal structure. Aluminum alloy AZ63 has excellent Cl--corrosion resistance characteristics and is suitable for the high-salt marine environment.

[0007] Further, the diameter of the annular hydraulic adjustment base is the same as the width of the floating drum connection steel plate.

[0008] Furthermore, a number of hydraulic jacks are evenly arranged circumferentially between the top plate and the bottom plate. The hydraulic jacks can telescopically adjust the distance between the top plate and the bottom plate. A built-in displacement sensor is installed at the top end of the piston rod of the hydraulic jack to monitor the telescopic amount of the hydraulic jack. Each hydraulic jack is connected to a hydraulic pump station arranged on the tension-leg type floating platform through an oil passage.

[0009] Furthermore, the hydraulic jack is fixed to the bottom plate by high-strength bolts, and the piston rod is fixed to the top plate by high-strength bolts.

[0010] Furthermore, the oil passage includes an annular main oil passage and a number of branch oil passages connected to the annular main oil passage. A hydraulic pump station interface is arranged on the annular main oil passage for connecting to the hydraulic pump station. The number of branch oil passages is equal to and corresponds to the number of hydraulic jacks one by one.

[0011] Furthermore, one-way valves are arranged on the branch oil passages to prevent the backflow of hydraulic oil.

[0012] The implementation method of the vibration damping connection node of the present invention includes:

[0013] Obtain the frequency and direction data of wind, wave and current at the engineering implementation location, and then conduct numerical simulation to determine the threshold value S 阈 of the stability index S and the threshold value D 阈 of the shock absorption performance index D; select the vibration damping connection node with the stability index S greater than or equal to 1.1S 阈 , and at the same time the shock absorption performance index D greater than or equal to 1.1D 阈 ; install the vibration damping connection nodes that meet the requirements at the connection positions between each anchor chain and the connecting steel plate of the buoy.

[0014] The formula for the stability index S is as follows:

[0015]

[0016] where n is the number of tension legs; ΔT i is the tension deviation of the i-th tension leg, T i is the tension of the i-th tension leg, which is measured in real time by a tension sensor installed on the tension leg, is the average tension of the i-th tension leg; K h is the hydraulic adjustment coefficient; Δh is the real-time adjustment height of the bottom plate, which is monitored in real time by a displacement sensor; is the vibration velocity of the damper, which is calculated by integrating the vibration acceleration signal collected by installing an acceleration sensor on the shock-absorbing shell of the damper; K d is the damper distribution effect coefficient, usually 0.8 - 1.2; c is the shape memory alloy damping coefficient; K j is the spherical hinge compensation coefficient,

[0017] K j = 1 - μ, where μ is the friction coefficient of the self-lubricating spherical plain bearing; θ is the rotation angle of the ball joint, which is monitored in real time by an angle sensor arranged inside the ball joint

[0018] The formula for the shock absorption performance index D is:

[0019]

[0020] where F dj is the viscous damping force of a single damper, F rj is the restoring force of a single shape memory alloy, F rj = E·ε j ·A, where E is the elastic modulus of the alloy, ε j is the plastic deformation, and A is the cross-sectional area of the damper; m is the equivalent vibration mass of the platform; ω is the frequency of wind, wave and current; α is the graphene aerogel composite enhancement coefficient, α = 1.2 - 1.5; ρ is the anti-fatigue factor, ρ = 0.8 - 0.9

[0021] Furthermore, during the service of each shock-absorbing connection node, the telescopic amount of the hydraulic jack is adjusted through the PLC control system to make the stability index S greater than or equal to S 阈 .

[0022] In the present invention, the shock-absorbing connection node is used to replace the fairlead to connect the TLP. Although the problem of anchor chain fatigue is solved, it may cause problems such as reduced platform stability and weakened tension adjustment function. By adjusting the height of the bottom plate with a hydraulic jack, the tension of the tension leg can be indirectly adjusted, the platform tilt can be reduced, and the overall stability of the platform can be improved

[0023] Beneficial effects: Compared with the prior art, the present invention has the following remarkable advantages:

[0024] (1) The shape memory alloy damper and the graphene aerogel composite shock-absorbing shell play a dual shock-absorbing role, and the ball joint provides a displacement compensation function, thus realizing the shock absorption of the connection node and effectively alleviating the fatigue damage problem caused by the micro-amplitude vibration of the anchor chain due to wind, wave and current, which is helpful for the further popularization and application of the TLP

[0025] (2) The graphene aerogel composite shock-absorbing shell has excellent seawater corrosion resistance, which can extend the service life of the damper and ensure the long-term stable service of the shock-absorbing connection node in the harsh marine environment Description of the drawings

[0026] Figure 1 is a schematic diagram of the layout position of the shock-absorbing connection node on the TLP in the embodiment of the present invention;

[0027] Figure 2 is a schematic structural diagram of the vibration damping connection node in the embodiment of the present invention;

[0028] Figure 3 is a schematic layout diagram of the hydraulic jacks in the annular hydraulic adjustment base in the embodiment of the present invention;

[0029] Figure 4 is a schematic diagram of the hydraulic jacks installed between the top plate and the bottom plate of the annular hydraulic adjustment base in the embodiment of the present invention. Detailed implementation manners

[0030] The present invention will be further described below with reference to the accompanying drawings.

[0031] Acc Figures 1 to 4 The reference numerals in the accompanying drawings are as follows:

[0032] 1, buoy connecting steel plate;

[0033] 2, vibration damping connection node; 21, annular hydraulic adjustment base; 221, damper shock-absorbing housing; 222, shape memory alloy damper; 23, connecting ear plate; 24, spherical hinge joint; 241, self-lubricating spherical plain bearing; 242, tungsten alloy wear-resistant bushing; 211, hydraulic jack; 212, piston rod; 213, annular main oil passage; 214, displacement sensor; 215, branch oil passage;

[0034] 3, anchor chain.

[0035] As Figures 1 to 4 shown, the embodiment of the present invention provides a vibration damping connection node between a tension leg type floating platform and an anchor chain, and the number of the vibration damping connection nodes is the same as that of the tension legs of the floating platform.

[0036] The vibration damping connection node includes an annular hydraulic adjustment base 21, and the diameter of the annular hydraulic adjustment base 21 is the same as the width of the buoy connecting steel plate 1. The annular hydraulic adjustment base 21 has a top plate and a bottom plate, and the top plate is welded and fixed at the middle position of the bottom of the buoy connecting steel plate 1, and the top plate and the bottom plate face each other up and down.

[0037] Six hydraulic jacks 211 are evenly arranged along the circumferential direction between the top plate and the bottom plate. The hydraulic jacks 211 are fixed to the bottom plate by high-strength bolts, and the piston rods 212 of the hydraulic jacks 211 are fixed to the top plate by high-strength bolts. Each hydraulic jack 211 is connected to a hydraulic pump station arranged on the tension leg type floating platform through an oil passage. Specifically, the oil passage includes an annular main oil passage 213 and six branch oil passages 215 connected to the annular main oil passage 213. A hydraulic pump station interface for connecting to the hydraulic pump station is arranged on the annular main oil passage 213, and the six branch oil passages 215 are connected to the six hydraulic jacks 211 in one-to-one correspondence. One-way valves are arranged on the branch oil passages 215 to prevent the oil from flowing back.

[0038] The hydraulic jack 211 can telescopically adjust the distance between the top plate and the bottom plate. A built-in displacement sensor 214 is installed at the top end of the piston rod 212 of the hydraulic jack 211 for monitoring the telescopic amount of the hydraulic jack 211.

[0039] A connecting ear plate 23 is provided below the bottom plate, and the two are vertically aligned. Six shape memory alloy dampers 222 are evenly arranged along the circumferential direction between the bottom plate and the connecting ear plate 23. A damper shock-absorbing housing 221 is sleeved on the surface of each shape memory alloy damper 222, and the damper shock-absorbing housing 221 is made of a porous graphene aerogel composite material. Both ends of the damper shock-absorbing housing 221 are fixed to the bottom plate and the connecting ear plate 23 respectively by a modified epoxy resin adhesive. After the connection is completed, silicone sealant is filled at the joints of the damper shock-absorbing housing 221 with the bottom plate and the connecting ear plate 23 to form a continuous waterproof film to prevent seawater from seeping into the interface. At the same time, a polyvinylidene fluoride (PVDF) coating with a thickness of ≥300 μm is sprayed on the outer surface of the connection area, which is resistant to seawater impact and wear and can also inhibit the attachment of microorganisms. The shape memory alloy has strong plastic deformation ability, can realize the automatic reset of the damper, and significantly improves the seismic resistance. Moreover, the shape memory alloy has good fatigue resistance and is suitable for the TLP that is long-term affected by wind, wave and current. The damper and the shock-absorbing housing structure have better buffering and seismic resistance effects than a single damper when facing wind, wave and current in multiple directions, can reduce micro-vibration and improve stability. The porous graphene aerogel composite shock-absorbing housing can also prevent seawater corrosion and extend the service life of the damper.

[0040] A sacrificial anode block is provided at the bottom of the bottom plate, and the material is aluminum alloy AZ63, which can effectively improve the seawater corrosion resistance and enhance the adaptability to the marine environment.

[0041] A ball joint 24 is welded to the bottom of the connecting ear plate 23. The ball joint 24 is used to connect the anchor chain 3, and the rotation angle |θ| of the ball joint 24 ≤ 15°. A self-lubricating spherical plain bearing 241 and a tungsten alloy wear-resistant bushing 242 are arranged inside the ball joint 24. The wind, wave and current loads in the marine environment are multi-directional and periodic. The rotation angle within 15° can ensure that the ball joint maintains the linear displacement compensation characteristic during reciprocating motion and avoid the non-linear vibration amplification effect (such as resonance risk) caused by excessive angle. An excessive rotation angle will exacerbate the stress concentration on the contact surface and lead to the initiation of micro-cracks on the surface of the bushing. Within 15°, the contact stress can be controlled within the allowable stress range of the material (about 1200 MPa), and the wear life can be extended.

[0042] The friction coefficient of the self-lubricating spherical bearing 241 is less than 0.08, and the hardness of the tungsten alloy wear-resistant bushing 242 is HRC62±2. The self-lubricating spherical bearing 241 usually adopts a solid lubricating coating or a porous oil-containing structure. In a seawater immersion environment, if the friction coefficient is above 0.08, it will lead to accelerated failure of the lubricating film (seawater scouring is easy to carry away grease), causing direct metal contact wear. Below this threshold, the self-lubricating effect of the coating can be maintained for at least 10 years without maintenance. The HRC62±2 hardness of tungsten alloy (mainly composed of W-Ni-Fe) corresponds to a microhardness of about 650~700HV, which can effectively resist the abrasive wear of the anchor chain during reciprocating motion (the hardness of suspended sediment in the marine environment is about HV300~500). If the hardness is lower than HRC60, the surface of the bushing is easily scratched by sediment particles, forming wear grooves, resulting in an increase in the rotation clearance of the ball joint (the displacement compensation accuracy decreases by 30% when it exceeds 0.1mm). The friction coefficient design of self-lubricating spherical plain bearings depends on the hardness of the counterpart. When the bushing hardness is HRC62±2, the coating wear rate on the bearing surface is relatively low. If the hardness deviates from this range, the coating wear rate will increase by 1 to 2 times, causing the friction coefficient to rise and exceed the 0.08 threshold, destroying the design balance between stability and shock absorption performance.

[0043] The embodiment of the present invention further provides a method for implementing the vibration-damping connection node according to the embodiment of the present invention, comprising:

[0044] Dispatch a survey ship and use the corresponding measuring equipment to obtain sea condition data such as wind, wave and current frequency and direction at the project implementation location, and then conduct numerical simulation to determine the threshold value S of the stability index S. 阈 and the threshold value D of the shock absorption performance index D 阈 ; Select stability index S greater than or equal to 1.1S 阈 , and the shock absorption performance index D is greater than or equal to 1.1D 阈 A vibration-damping connection node is installed at the connection position between each anchor chain 3 and the buoy connecting steel plate 1, and the vibration-damping connection node is installed. The stability index and shock-absorbing performance index of the vibration-damping connection node will change with, for example, the damper structure, the damper material, the porosity of the graphene aerogel composite material, etc., so it is necessary to select the vibration-damping connection node.

[0045] The purpose of selecting the 1.1 times threshold is that deep-sea conditions are complex and changeable. In actual service, extreme sea conditions beyond design expectations may occur. In addition, as the service time increases, the performance of each component of the vibration-damping connection node will gradually deteriorate. Therefore, it is necessary to leave a certain safety margin.

[0046] The stability index S reflects the tension uniformity and tilt control ability of the platform under the action of wind, waves and currents, and is related to the tension adjustment ability of the annular hydraulic base, the damper distribution effect and the ball joint displacement compensation. The formula is as follows:

[0047]

[0048] Among them, n is the number of tethers;

[0049] ΔT i is the tension deviation of the i-th tether, T i is the tension of the i-th tether, which is measured in real time by a tension sensor installed on the tether, is the average tension of the i-th tether;

[0050] K h is the hydraulic adjustment coefficient, which is determined by the performance test of the hydraulic system;

[0051] Δh is the real-time adjusted height of the platform bottom plate, which is monitored in real time by a displacement sensor 214;

[0052] is the vibration velocity of the damper, which is obtained by installing an acceleration sensor on the shock-absorbing shell 221 of the damper and calculating by integrating the collected vibration acceleration signal;

[0053] K d is the distribution effect coefficient of the damper. By establishing a platform structure model containing the damper and inputting wave loads in different directions, the vibration velocity of the damper and the tension deviation ΔT i are correlated, and the tension uniformity effect is defined The larger it is, the more uniform the tension is), the average vibration velocity of the damper Assume The slope K is obtained by fitting multiple groups of working condition data d , and it is normalized to a dimensionless coefficient, usually 0.8 - 1.2, to eliminate the influence of units;

[0054] c is the shape memory alloy damping coefficient, which is directly taken as the mechanical property parameter of the material or measured by a dynamic tensile test;

[0055] K j is the spherical hinge compensation coefficient, which is related to the friction coefficient μ of the self-lubricating spherical plain bearing, K j = 1 - μ;

[0056] θ is the rotation angle of the spherical hinge, which is monitored in real time by an angle sensor installed inside the spherical hinge joint.

[0057] The shock absorption performance index D quantifies the vibration attenuation ability, which is determined by the synergy of the energy consumption of the damper, the reset characteristics of the shape memory alloy, and the graphene aerogel composite layer. Its formula is:

[0058]

[0059] Among them, F dj is the viscous damping force of a single damper, F rj is the restoring force of a single shape memory alloy, F rj = E·ε j ·A, where E is the elastic modulus of the alloy, ε j is the plastic deformation, and A is the cross-sectional area of the damper; m is the equivalent vibration mass of the platform. By establishing a finite element model of the tension leg type floating platform, considering the platform body, equipment, tension legs and added water mass, the equivalent mass of the first-order vertical vibration mode is extracted through modal analysis; ω is the frequency of wind, wave and current (a variable during service), which is collected in real time by on-site sea condition monitoring equipment; α is the graphene aerogel composite enhancement coefficient, α = 1.2 - 1.5; ρ is the anti-fatigue factor, ρ = 0.8 - 0.9.

[0060] When the vibration damping connection node is determined, each parameter in the vibration damping performance index D has been determined. Among them, the frequency ω of wind, wave and current is a range value measured from the engineering implementation location. Thus, a range of vibration damping performance indexes can be determined. The threshold D 阈 of the determined vibration damping performance index D is higher than the upper limit of the determined range of vibration damping performance indexes. Therefore, during the service of each vibration damping connection node, the vibration damping performance index D will necessarily be higher than D 阈 , so there is no need to pay attention to the vibration damping performance index during service.

[0061] During the service of each vibration damping connection node, n, K h , K d , c, K j are fixed values, and ΔT i , Δh, θ are obtained based on real-time monitoring by sensors. The telescopic amount of the piston rod is directly read through the displacement sensor built in the hydraulic jack and is fed back to the PLC control system in real time to adjust the telescopic amount of the hydraulic jack so that the stability index S is greater than or equal to S 阈 .

[0062] The present invention replaces the original fairlead connecting the platform and the anchor chain with a vibration damping connection node, which may cause problems such as reduced platform stability and weakened tension adjustment function. For this reason, the present invention indirectly adjusts the tension of the tension leg by automatically adjusting the bottom plate height of the annular hydraulic adjustment base, reduces the platform tilt, and improves the overall stability of the platform. At the same time, the present invention can relieve the fatigue damage problem of the anchor chain, improve the service life of the anchor chain, and is of great significance to the development of the tension leg type floating platform.

Claims

1. A vibration-damping connection node between a tension-leg floating platform and an anchor chain, characterized in that: The invention comprises an annular hydraulic adjustment base (21) having a top plate and a bottom plate, wherein the top plate is fixed to the bottom of a buoy connection steel plate (1), a connection ear plate (23) is arranged below the bottom plate, a plurality of shape memory alloy dampers (222) are evenly arranged between the bottom plate and the connection ear plate (23) along the circumferential direction, a damper shock absorbing shell (221) is sleeved on the surface of the shape memory alloy damper (222), and two ends of the damper shock absorbing shell (221) are respectively fixed to the bottom plate and the connection ear plate (23) by means of modified epoxy resin glue; the damper shock absorbing shell (221) adopts a graphene aerogel composite material; and the anchor chain (3) is connected to the connection ear plate (23) by means of a ball joint (24).

2. The vibration-damping connection node between a tension-leg floating platform and an anchor chain according to claim 1, characterized in that: The rotation angle |θ| of the ball joint (24) is ≤15°; a self-lubricating spherical bearing (241) and a tungsten alloy wear-resistant bushing (242) are arranged inside the ball joint (24); the friction coefficient of the self-lubricating spherical bearing (241) is less than 0.08, and the hardness of the tungsten alloy wear-resistant bushing (242) is HRC62±2.

3. The vibration-damping connection node between a tension-leg floating platform and an anchor chain according to claim 1, characterized in that: A sacrificial anode block is arranged at the bottom of the base plate, and the material is aluminum alloy AZ63.

4. The vibration-damping connection node between a tension-leg floating platform and an anchor chain according to claim 1, characterized in that: The diameter of the annular hydraulic adjustment base (21) is consistent with the width of the buoy connection steel plate (1).

5. The vibration-damping connection node between a tension-leg floating platform and an anchor chain according to any one of claims 1 to 4, characterized in that: A plurality of hydraulic jacks (211) are evenly arranged between the top plate and the bottom plate along the circumferential direction, and the hydraulic jacks (211) can adjust the distance between the top plate and the bottom plate by telescoping; a built-in displacement sensor (214) is installed at the top end of the piston rod (212) of the hydraulic jack (211) for monitoring the telescoping amount of the hydraulic jack (211); and each hydraulic jack (211) is connected to a hydraulic pump station arranged on the tension leg type floating platform through an oil channel.

6. The vibration-damping connection node between a tension-leg floating platform and an anchor chain according to claim 5, characterized in that: The hydraulic jack (211) is fixed to the bottom plate by high-strength bolts, and the piston rod (212) is fixed to the top plate by high-strength bolts.

7. The vibration-damping connection node between a tension-leg floating platform and an anchor chain according to claim 5, characterized in that: The oil channel comprises an annular main oil channel (213) and a plurality of branch oil channels (215) connected to the annular main oil channel (213); a hydraulic pump station interface is provided on the annular main oil channel (213) for connecting to the hydraulic pump station; the branch oil channels (215) are equal in number to the hydraulic jacks (211) and are connected one-to-one.

8. The vibration-damping connection node between a tension-leg floating platform and an anchor chain according to claim 7, characterized in that: A one-way valve is provided on the branch oil passage (215) to prevent the hydraulic oil from flowing back.

9. A method for implementing the vibration-damping connection node according to claim 5, characterized in that: include: Obtain the frequency and direction data of wind, wave and current at the project implementation location, and then perform numerical simulation to determine the threshold S of the stability index S 阈 and the threshold value D of the shock absorption performance index D 阈 ; Select stability index S greater than or equal to 1.1S 阈 , and the shock absorption performance index D is greater than or equal to 1.1D 阈 The vibration-damping connection nodes meeting the requirements are installed at the connection positions of each anchor chain (3) and the buoy connection steel plate (1); The formula of stability index S is as follows: Where n is the number of tension legs; ΔT i is the tension deviation of the ith tension leg, T i is the tension of the ith tension leg, measured in real time by the tension sensor installed on the tension leg, is the average tension of the ith tension leg; K h is the hydraulic adjustment coefficient; Δh is the real-time adjustment height of the bottom plate, which is monitored in real time by the displacement sensor (214); is the vibration velocity of the damper, which is calculated by installing an acceleration sensor on the damper shock-absorbing housing (221), collecting the vibration acceleration signal, and integrating it; K d is the damper distribution effect coefficient, usually 0.8 to 1.2; c is the shape memory alloy damping coefficient; K j is the ball joint compensation coefficient, K j =1-μ, μ is the friction coefficient of the self-lubricating spherical bearing; θ is the rotation angle of the ball joint, which is monitored in real time by the angle sensor installed inside the ball joint; The formula for the shock absorption performance index D is: Among them, F dj is the viscous damping force of a single damper, F rj is the restoring force of a single shape memory alloy, F rj =E·ε j A, E are the elastic modulus of the alloy, ε j is the plastic deformation, A is the cross-sectional area of ​​the damper; m is the equivalent vibration mass of the platform; ω is the wind wave current frequency; α is the graphene aerogel composite reinforcement coefficient, α=1.2~1.5; ρ is the anti-fatigue factor, ρ=0.8~0.

9.

10. The implementation method of the vibration-damping connection node according to claim 9, characterized in that: During the service period of each vibration reduction connection node, the extension and contraction amount of the hydraulic jack (211) is adjusted through the PLC control system so that the stability index S is greater than or equal to S 阈 .

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