Variable cross-section stand column type offshore platform foundation and resonance suppression control system

Abstract

The invention provides a variable cross-section stand column type offshore platform foundation and a resonance suppression control system, and belongs to the technical field of ocean engineering. The problem of how to improve the seakeeping performance of the offshore platform foundation by adjusting the cross sectional area of the waterline contact section on the premise of keeping the stability is solved. The device comprises a plurality of stand columns and a buoyancy adjusting device. Each stand column is provided with a contact section intersecting with a water surface line, each contact section is divided into an inner part and an outer part, the interior of each contact section is a center column with the radius smaller than that of the corresponding stand column, the exterior of each contact section is a plurality of square boxes which are evenly distributed in the circumferential direction, and the square boxes are connected with the center columns through telescopic mechanisms and can move in a telescopic mode in the horizontal direction. The buoyancy adjusting device controls a plurality of lifts to ensure that the water surface line is located in the contact section. The device is mainly used for enabling the offshore platform to achieve the optimal wave-resistant effect.

Description

Technical Field

[0001] The invention belongs to the technical field of marine engineering, and in particular relates to a variable-section column-type offshore platform foundation and a resonance suppression control system. Background Art

[0002] In recent years, with the increasing consumption of fossil energy, people's demand for clean energy has gradually increased. Due to its unique geographical advantages and rich resources, offshore platforms can support the preparation of a variety of clean energy, such as offshore wind power, offshore photovoltaics, ocean temperature difference energy, and hydrogen production on offshore platforms. Offshore platforms provide a broad development space for the preparation of clean energy and have great development potential.

[0003] However, in actual use, offshore platforms usually face problems such as large wave loads and obvious dynamic response, which in turn affects the safety of the system and the efficiency of energy preparation. The wave resistance of the offshore platform can be improved by adjusting the cross-sectional area of ​​the waterline contact section, but the change in the cross-sectional area of ​​the water surface line contact section will also cause changes in the stability of the offshore platform. How to improve the wave resistance of the offshore platform while maintaining stability has become an important research topic at present, aiming to promote the further development and application of offshore platform technology. Summary of the invention

[0004] In view of this, in order to solve the problem of how to improve the wave resistance of the offshore platform foundation by adjusting the cross-sectional area of ​​the waterline contact section while maintaining stability. The present invention proposes a variable-section column-type offshore platform foundation and a resonance suppression control system. The cross-sectional area of ​​the contact section between the platform foundation and the water surface line can be adjusted to meet the offshore platform's wave resistance requirements under various sea conditions. The design of the device fully considers the needs of offshore floating platforms of different types and sizes and has good adaptability. The platform foundation is equipped with a resonance suppression control system, which can adjust the size of the cross-sectional area of ​​the contact section between the column and the water surface line in real time according to changes in the marine environment, so that the platform's natural period is staggered with the wave period to avoid resonance, thereby effectively reducing the wave load on the offshore platform foundation and the dynamic response of the offshore platform to achieve the best wave resistance effect.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a variable-section column-type offshore platform foundation, comprising a plurality of columns and a buoyancy adjustment device;

[0006] Each column is provided with a contact section intersecting with the water surface line, and the contact section is divided into an inner and an outer part, the inner part is a central column with a radius smaller than the radius of the column, and the outer part is a plurality of square boxes evenly arranged in the circumferential direction, and the square boxes are connected to the central column through a telescopic mechanism and can be telescopically moved in the horizontal direction;

[0007] The buoyancy adjustment device controls the lifting and lowering of multiple columns to ensure that the water surface line is within the contact section.

[0008] Furthermore, the telescopic mechanism is driven by a hydraulic device and is provided with a nitrogen-filled chamber on the outside.

[0009] Furthermore, the telescopic mechanism is a folding arm. One end of the folding arm is hinged to the central column, and the other end is hinged to the square box.

[0010] Furthermore, a plurality of limiting grooves are radially provided on the bottom surface of the upper column of the central column. A round pin is provided on the top of the square box. The limiting grooves cooperate with the round pin to make the square box move strictly radially when moving horizontally.

[0011] Furthermore, the buoyancy adjustment device is a floating drum. The floating drum is a hollow column structure and is provided with a dynamic ballast chamber inside. There are four columns, arranged at the four corners of a square, and the bottom is fixed by two cross braces and two floating drums arranged alternately.

[0012] Furthermore, the equivalent radius range for the telescopic mechanism to adjust the horizontal movement of the square box is 70%-120% of the column radius. When the telescopic mechanism is fully retracted, the overall cross-sectional profile of the plurality of square boxes is an annular shape.

[0013] Furthermore, 12 square boxes are evenly arranged circumferentially outside each column.

[0014] Furthermore, the central column is made of corrosion-resistant strengthened structural steel, and the square box is formed by compounding hollow glass microspheres and resin.

[0015] A resonance suppression control system for applying the above variable-section column-type offshore platform foundation includes a wave detection module, a spectrum analysis module, a telescopic mechanism control module, and an active vibration avoidance control module;

[0016] The wave detection module is used to collect the wave height time series data around the platform foundation in real time and transmit it to the spectrum analysis module;

[0017] The spectrum analysis module is used to calculate the current sea wave energy density spectrum according to the wave height time series data and extract the main frequency. The main frequency is defined as the frequency f0 corresponding to the peak of the energy spectrum. The spectrum analysis module transmits f0 to the active vibration avoidance control module in real time;

[0018] The telescopic mechanism control module transmits the cross-sectional area S of the platform water line contact section to the active vibration avoidance control module in real time, and drives the telescopic mechanism to extend or retract according to the control instruction of the active vibration avoidance control module, so that the cross-sectional area S of the platform water line contact section is continuously adjustable within a preset range [S min ,S max ;

[0019] The active vibration isolation control module incorporates a digital twin model of the dynamic response of the offshore hydrogen production platform. Based on the real-time input of f0 and the cross-sectional area S of the platform's waterline contact section, it dynamically calculates the natural period T of the platform. s , and generates a control instruction to send to the telescopic mechanism control module, so that T s satisfies:

[0020] |1 / T s -f0|≥Δ

[0021] where Δ is the frequency isolation margin set according to the platform structure safety factor.

[0022] Furthermore, the wave detection module includes at least two groups of wave gauges arranged circumferentially along the foundation of the offshore platform. The detection area of the wave gauges is in the range of 200 - 500 meters from the perimeter of the platform foundation. The spectrum analysis module is connected to the embedded processor of the wave gauges and performs segmented windowing processing and calculation on the wave height data based on the improved Welch algorithm.

[0023] Compared with the prior art, the beneficial effects of the variable cross-section column-type offshore platform foundation and resonance suppression control system of the present invention are as follows:

[0024] 1. The offshore platform foundation of the present invention can adjust the cross-sectional area of the waterline contact section, improving the wave resistance of the offshore platform foundation to meet the wave resistance requirements of the offshore platform under various sea conditions.

[0025] 2. The offshore platform foundation of the present invention is equipped with a resonance suppression control system, which can adjust the size of the cross-sectional area of the column contact section in real time according to the changes in the ocean environment, and avoid the natural period being the same as the frequency when the wave energy is the largest, resulting in resonance and having an adverse impact on the stability of the platform. It can effectively reduce the wave load and dynamic response of the waves on the offshore platform foundation, improve the wave resistance performance of the offshore platform foundation, reduce the dependence on professional technicians, and enable the offshore platform foundation to adapt to harsh ocean environments.

[0026] 3. During the hoisting process of the offshore platform, due to its small draft, it is prone to being affected by wind and waves and will shake. The offshore platform foundation of the present invention can increase the cross-sectional area of the column contact section during the hoisting process. The initial stability of the offshore platform will increase, and the restoring force coefficients in the heave and roll degrees of freedom will also increase, thus facilitating the offshore platform to return to its original static state.

[0027] 4. The seawater in the gap between the square box and the central column of the present invention forms a restricted flow under the action of waves, generating viscous resistance, which can consume part of the wave energy and reduce the overall dynamic response of the platform. This effect is similar to the design of anti-rolling fins or damping tanks of ships, helping to suppress roll and heave motions.

[0028] 5. The structure of the present invention is simple, reducing the overall complexity. Considering various working conditions in the actual marine environment, the present invention adopts a modular design that is easy to disassemble. Each square box is independent of each other, making the future cleaning and maintenance work more convenient and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0030] Figure 1 is a schematic diagram of the main structure of the column of the present invention;

[0031] Figure 2 is a front view of the contact section when the square box of the present invention is in a fully retracted state;

[0032] Figure 3 is a top view of the contact section when the square box of the present invention is in a fully retracted state;

[0033] Figure 4 is a front view of the contact section when the square box of the present invention moves to a position with the same equivalent radius as the column;

[0034] Figure 5 is a top view of the contact section when the square box of the present invention moves to a position with the same equivalent radius as the column;

[0035] Figure 6 is a front view of the contact section when the square box of the present invention is in a fully extended state;

[0036] Figure 7 is a top view of the contact section when the square box of the present invention is in a fully extended state;

[0037] Figure 8 is a schematic diagram of the limiting groove structure of the present invention;

[0038] Figure 9 is a schematic diagram of the round pin structure of the present invention;

[0039] Figure 10 is a diagram showing the change in the positional relationship between the limiting groove and the round pin when the square box of the present invention moves from the fully retracted position to the fully extended position, where (a) represents the square box at the fully retracted position, (b) represents the square box moving to the edge position of the column, and (c) represents the square box at the fully extended position;

[0040] Figure 11 is a schematic diagram of the cross brace and the floating drum of the present invention;

[0041] Figure 12 is a schematic diagram of the structure of the resonance suppression control system of the present invention;

[0042] Figure 13 It is a graph showing the relationship between the wave spectral density and frequency in a certain sea area;

[0043] In the figure: 1 - column; 2 - buoy; 11 - contact section; 12 - cross brace; 111 - central column; 112 - square box; 113 - telescopic mechanism; 114 - limit groove; 115 - round pin;

[0044] 101 - wave detection module; 102 - spectral analysis module; 103 - telescopic mechanism control module; 104 - active vibration isolation control module. Specific implementation manners

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0046] I. Specific implementation manner one, see Figures 1-13 Describe this implementation manner. A variable cross-section column type offshore platform foundation includes a plurality of columns 1 and a buoyancy adjustment device;

[0047] Each column 1 is provided with a contact section 11 that intersects with the water line. The contact section 11 is divided into two parts, the inner part is a central column 111 with a radius smaller than the radius of the column, and the outer part is a plurality of square boxes 112 arranged circumferentially and evenly. The square boxes 112 are connected to the central column 111 through a telescopic mechanism 113 and can telescopically move in the horizontal direction; according to the size and shape of the offshore platform foundation, the number, size and layout of the columns 1 are designed. The seawater in the gap between the square box 112 and the central column 111 forms a restricted flow under the action of waves, generating viscous resistance, which can consume part of the wave energy and reduce the overall dynamic response of the offshore platform. This effect is similar to the design of anti-rolling fins or damping tanks on ships and helps to suppress rolling and heaving motions.

[0048] The buoyancy adjustment device controls the lifting of a plurality of columns 1 to ensure that the water line is located within the contact section 11.

[0049] The telescopic mechanism 113 in the present application is driven by a hydraulic device and is provided with a nitrogen-filled cavity on the outside. The nitrogen-filled cavity is provided, and the pressure in the cavity is slightly higher than the external water pressure, and a watertight gasket is provided at the connection part between the telescopic mechanism 113 and the central column 111 to form a physical barrier to prevent seawater intrusion from eroding key components.

[0050] On the column 1 of the present invention, there is a contact section 11 that intersects with the water surface, and the cross-sectional area of the contact section 11 can change compared to the cross-sectional areas at both ends of the contact section 11. The contact section 11 is divided into an inner and an outer part. The inner layer is a central column 111 made of high-strength corrosion-resistant steel, and the outer layer is 12 independent square boxes 112. A telescopic mechanism 113 driven by a hydraulic device is connected between the central column 111 and the square box 112. When the marine environment changes, the telescopic mechanism 113 is adjusted to push the square box 112 outwards or retract it inwards, thereby adjusting the cross-sectional area of the contact section in real time.

[0051] The telescopic mechanism 113 described in this application is a folding arm. One end of the folding arm is hinged to the central column 111, and the other end is hinged to the square box 112. The folding arm is connected by multiple hinges or flexible materials to achieve the switching between compact storage and free extension, and can effectively utilize the limited space. Other telescopic structures such as rail sliding type can also be adopted in the present invention.

[0052] Above the central column 111 of this application, a plurality of limit grooves 114 are radially provided on the bottom surface of the column 1, and a round pin 115 is provided on the top of the square box 112. The limit grooves 114 cooperate with the round pin 115 to make the square box 112 move strictly radially when moving horizontally. In the present invention, the limit grooves 114 are opened at the bottom of the upper half of the column 1 and are closely matched with the round pins 115 on the top of the square box 112, so that the square box 112 moves strictly along the radial direction under the push of the telescopic mechanism 113, preventing circumferential movement due to the influence of wave loads.

[0053] The buoyancy adjustment device described in this application is a buoy 2. The buoy 2 is a hollow column structure with a dynamic ballast tank inside. There are four columns 1, arranged at the four corners of a square, and the bottom is fixed by two cross braces 12 and two buoys 2 arranged alternately. The two cross braces 12 and the two buoys 2 are arranged alternately on the four side lines of the square as shown in the appendix Figure 11 shown. By adjusting the ballast tank inside the bottom buoy 2 of the present invention, the position of the center of buoyancy and the center of gravity of the offshore platform is changed, and the position of the waterline surface is adjusted to the vicinity of the variable cross-section contact section, better reflecting the function of the variable cross-section.

[0054] The equivalent radius range for the telescopic mechanism 113 described in this application to adjust the horizontal movement of the square box 112 is 70%-120% of the column radius. Referring to the appendix Figure 3 , when the telescopic mechanism 113 is fully retracted, the overall cross-sectional profile of the multiple square boxes 112 is a circular ring. Each square box is one-twelfth of a circular ring.

[0055] Twelve square boxes 112 are evenly arranged circumferentially outside each column 1 of this application.

[0056] The material of the central column 111 described in this application is corrosion-resistant reinforced structural steel, and the square box 112 is formed by compound molding of hollow glass microspheres and resin. The corrosion-resistant reinforced structural steel is a kind of steel achieved through alloying design, advanced process control and surface modification technology, with both high strength and excellent corrosion resistance. The square box 112 is formed by compound molding with a new material of hollow glass microspheres and resin. This material is light in weight, corrosion-resistant and high in strength, which can greatly improve the service life of the square box 112.

[0057] Research has found that the wave loads brought by the waterline have a greater impact on the stability of the offshore platform foundation, and the impact waves on the waterline are unstable. Therefore, in the present invention, a contact section 11 intersecting with the waterline is provided on the column 1, and the contact section 11 is set in a form with an adjustable cross-sectional size, so that the natural period of the platform is staggered from the wave period to avoid resonance. On the premise of ensuring the stability of the platform foundation, the wave loads and dynamic responses brought by the waves to the circumferential columns are greatly reduced, effectively improving the wave resistance and economic benefits of the offshore platform, expanding the application of the offshore platform under wider wind and wave conditions, and the entire foundation structure is relatively simple, with great economic benefits.

[0058] A resonance suppression control system applied to the above variable cross-section column type offshore platform foundation includes a wave detection module 101, a spectrum analysis module 102, a telescopic mechanism control module 103 and an active vibration avoidance control module 104;

[0059] The wave detection module 101 is used to collect the wave height time series data around the platform foundation in real time and transmit it to the spectrum analysis module 102;

[0060] The spectrum analysis module 102 is used to calculate the current sea wave energy density spectrum based on the wave height time series data and extract the main frequency. The main frequency is defined as the frequency f0 corresponding to the peak of the energy spectrum. The spectrum analysis module 102 transmits f0 to the active vibration avoidance control module 104 in real time;

[0061] The telescopic mechanism control module 103 transmits the cross-sectional area S of the platform waterline contact section to the active vibration avoidance control module 104 in real time, and drives the telescopic mechanism to extend or contract according to the control instruction of the active vibration avoidance control module 104, so that the cross-sectional area S of the platform waterline contact section is continuously adjustable within the preset range [S min , S max ;

[0062] The active vibration avoidance control module 104 has a digital twin model of the dynamic response of the offshore hydrogen production platform built in. According to the real-time input of f0 and the cross-sectional area S of the platform waterline contact section, it dynamically calculates the natural period T of the platform s , and generates a control instruction to send to the telescopic mechanism control module 103, so that T sSatisfy:

[0063] |1 / T s −f0|≥Δ

[0064] where Δ is the frequency isolation margin set according to the platform structure safety factor.

[0065] The wave detection module 101 described in this application includes at least two groups of wave height gauges arranged circumferentially along the foundation of the offshore platform. The detection area of the wave height gauges is the range of 200 - 500 meters from the periphery of the platform foundation. The spectrum analysis module 102 is connected to the embedded processor of the wave height gauge, and performs segmented windowing processing and calculation on the wave height data based on the improved Welch algorithm.

[0066] The present invention combines a wave prediction algorithm with real-time sensor data, and through intelligent control of the terminal, adjusts the cross-sectional area S of the platform waterline contact section in real time to improve the response efficiency. The present invention can be used in various offshore operation platforms, such as offshore hydrogen production platforms. An offshore hydrogen production platform is a process of decomposing water molecules in seawater into hydrogen and oxygen through electrolysis or other technical means. Offshore hydrogen production can use renewable energy such as wind energy and solar energy to electrolyze seawater to produce hydrogen, which helps to reduce the dependence on fossil fuels and promote the development of clean energy. Although hydrogen is a popular clean energy, the instability of its molecular structure makes it prone to explosion. The present invention provides a reliable technical solution for the offshore hydrogen production industry, with high wave resistance, practicability, economy, significant market potential and environmental value.

[0067] The working principle of the present invention is as follows:

[0068] Referring to the restoring force coefficient formulas in the heave and roll directions listed below, when the offshore platform is being hoisted, due to its small draft, it is easily affected by wind and waves and shakes. At this time, increasing the waterline area, the initial metacentric height of the platform will increase, and the restoring force coefficients in the heave and roll degrees of freedom will also be greater, so that the platform is more likely to return to its original static state.

[0069] czz = ρgAWL

[0070]

[0071] In the formula, c zz and c ΦΦ are the restoring force coefficients in the heave and roll directions respectively, ρ is the density of water, g is the acceleration due to gravity, A WL is the waterplane area, is the molded displacement volume, is the initial metacentric height (a core parameter for measuring the stability of a ship, referring to the vertical distance between the center of gravity and the metacenter of the ship. It directly affects the ship's ability to restore balance after being acted upon by external forces. When other conditions remain unchanged, the waterplane area A WL and the initial metacentric height show a positive correlation).

[0072] Therefore, when the offshore platform is being hoisted, the drive telescopic mechanism 113 adjusts the square box 112 from Figure 2 and Figure 3 the fully retracted state shown to Figure 6 and Figure 7 the fully extended state shown, adjusting the waterplane area to the maximum, which is most conducive to the offshore platform returning to its original static state and completing the hoisting of the offshore platform.

[0073] Reducing the cross-sectional area S of the platform's waterline contact section can weaken the interaction between the platform and the waves, making the displacement and angular response of the platform in the waves relatively smaller, and the RAO (the ratio of the amplitude of the floating body's motion to the amplitude of the waves when the floating body moves with the waves) of the platform under the same conditions will also become smaller. However, reducing the cross-sectional area S of the platform's waterline contact section may affect the resonance period of the floating body. For example, when the waterplane area is reduced, the natural periods of heave and pitch of the platform will increase.

[0074] Figure 13 The figure shows the energy distribution of waves with different frequencies in a certain sea area. When the frequency is about 0.75 rad / s, the energy of the waves is the largest. If the platform is arranged in this sea area, the natural period of the platform should avoid this frequency to prevent resonance and have an adverse impact on the stability of the platform.

[0075]

[0076] In the formula, T heave and T pitch are the natural periods of heave and pitch of the platform respectively, M is the mass of the platform, and ΔM is the added mass of the platform.

[0077] Therefore, when the platform is operating in the sea waves, through the analysis of the real-time sea conditions by the resonance suppression control system, the frequency f0 corresponding to the peak value of the wave energy density spectrum in the sea area where the platform is located is calculated. On the premise of avoiding resonance caused by the same f0 as the natural period of the platform, the cross-sectional area S of the platform's waterline contact section is reduced to enable the offshore platform to achieve the best seakeeping effect.

[0078] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. According to the content of this specification, many modifications and changes can be made. These embodiments are selected and specifically described in this specification in order to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention.

Claims

1. A variable-section column-type offshore platform foundation, characterized in that: It comprises a plurality of columns (1) and a buoyancy regulating device; Each column (1) is provided with a contact section (11) intersecting with the water surface line, the contact section (11) being divided into an inner and outer part, the inner part being a central column (111) having a radius smaller than that of the column (1), and the outer part being a plurality of square boxes (112) uniformly arranged in the circumferential direction, the square boxes (112) being connected to the central column (111) via a telescopic mechanism (113) and being capable of telescopic movement in the horizontal direction; The buoyancy regulating device controls the lifting and lowering of the plurality of columns (1) to ensure that the water surface line is located within the contact section (11).

2. The variable-section column type offshore platform foundation according to claim 1, characterized in that: The telescopic mechanism (113) is driven by a hydraulic device and is provided with a nitrogen-filled cavity on the outside.

3. The variable-section column type offshore platform foundation according to claim 2, characterized in that: The telescopic mechanism (113) is a folding arm, one end of which is hinged to the central column (111), and the other end of which is hinged to the square box (112).

4. The variable-section column type offshore platform foundation according to claim 1, characterized in that: A plurality of limiting grooves (114) are radially arranged on the bottom surface of the column (1) above the central column (111), and a round pin (115) is arranged on the top of the square box (112). The limiting grooves (114) cooperate with the round pin (115) so that the square box (112) moves strictly in the radial direction when moving horizontally.

5. The variable-section column type offshore platform foundation according to claim 1, characterized in that: The buoyancy regulating device is a float (2), which is a hollow column structure with a dynamic ballast tank inside. The four columns (1) are arranged in a square with four corners, and the bottom is fixed by two alternately arranged cross braces (12) and two floats (2).

6. The variable-section column type offshore platform foundation according to claim 1, characterized in that: The telescopic mechanism (113) adjusts the square box (112) to move horizontally so that the equivalent radius range is 70%-120% of the radius of the column (1). When the telescopic mechanism (113) is fully retracted, the overall cross-sectional profile of the plurality of square boxes (112) is a circular ring.

7. The variable-section column type offshore platform foundation according to claim 1, characterized in that: Twelve square boxes (112) are evenly arranged in the circumferential direction outside each column (1).

8. The variable-section column type offshore platform foundation according to claim 1, characterized in that: The central column (111) is made of corrosion-resistant reinforced structural steel, and the square box (112) is formed by composite molding of hollow glass microspheres and resin.

9. A resonance suppression control system applied to a variable cross-section column type offshore platform foundation as claimed in any one of claims 1 to 8, characterized in that: It comprises a wave detection module (101), a spectrum analysis module (102), a telescopic mechanism control module (103) and an active vibration avoidance control module (104); The wave detection module (101) is used to collect time series data of wave height around the platform foundation in real time and transmit it to the spectrum analysis module (102); The spectrum analysis module (102) is used to calculate the current wave energy density spectrum according to the wave height time series data and extract the main frequency, wherein the main frequency is defined as the frequency f0 corresponding to the peak value of the energy spectrum, and the spectrum analysis module (102) transmits f0 to the active vibration avoidance control module (104) in real time; The telescopic mechanism control module (103) transmits the cross-sectional area S of the platform water surface line contact segment to the active vibration avoidance control module (104) in real time, and drives the telescopic mechanism (113) to extend or contract according to the control instruction of the active vibration avoidance control module (104), so that the cross-sectional area S of the platform water surface line contact segment is within a preset range [S min , S max ] Continuously adjustable; The active vibration avoidance control module (104) has a built-in digital twin model of the offshore hydrogen production platform dynamic response, and dynamically calculates the platform natural period T according to the real-time input f0 and the cross-sectional area S of the platform water surface line contact section. s , and generates a control instruction to send to the telescopic mechanism control module (103) so that T s satisfy: |1 / T s -f0|≥Δ Wherein, Δ is the frequency isolation margin set according to the safety factor of the platform structure.

10. The resonance suppression control system according to claim 9, characterized in that: The wave detection module (101) comprises at least two groups of wave height meters arranged along the circumference of the platform foundation, the wave height meter detection area is within a radius of 200-500 meters around the platform foundation, and the spectrum analysis module (102) is connected to the embedded processor of the wave height meter, and performs segmented windowing processing and calculation on the wave height data based on the improved Welch algorithm.

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