Vibration reduction equipment and method for fluid resonance in deep sea FPSO moon pool

Abstract

The invention discloses a vibration reduction device and method for fluid resonance in a deep sea FPSO moon pool, and the method comprises the following steps: 1, evaluating the geometric structure and fluid dynamic characteristics of the deep sea FPSO moon pool, the geometric structure comprises the size and shape of the moon pool, and the fluid dynamic characteristics comprise the flow velocity and direction of fluid in a set time period; calculating the resonant frequency of the fluid in the moon pool based on the geometric structure and the fluid dynamic characteristics by adopting a three-dimensional fluid dynamic simulation technology; and 2, based on the fluid dynamics data sample obtained through evaluation, the layout and configuration scheme of vibration reduction equipment is designed, and the vibration reduction equipment comprises at least three vibration reduction units. By accurately evaluating the geometric structure and fluid dynamic characteristics of the moon pool and adopting proper vibration reduction equipment, fluid resonance in the moon pool can be effectively reduced, so that the structural stability and safety of the FPSO are improved. And the resonance phenomenon is reduced, so that the structural fatigue is prevented, and the service life of the FPSO is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of vibration reduction technology, and in particular to a vibration reduction device and method for fluid resonance in a deep-sea FPSO moon pool. Background Art

[0002] In the field of deep-sea oil and gas production, floating production storage and offloading (FPSO) is an important offshore production facility that can process, store, and load and unload crude oil at sea far from land. The structural design of FPSO includes a key part, namely the moon pool, which is a spatial structure located in the center of FPSO that vertically penetrates the entire platform and is used to facilitate deep-sea drilling and riser deployment operations. However, in the complex and changeable marine environment of the deep sea, a large fluid resonance phenomenon may occur inside the moon pool, which will have a negative impact on the stability and safety of FPSO.

[0003] In order to meet the above challenges, a variety of vibration reduction measures have been proposed in the prior art. These measures mainly include installing vibration reduction equipment in the moon pool, such as vibration reduction units and diverter plates, to change the flow direction of the fluid or reduce the fluid velocity, thereby reducing the impact of fluid resonance. Through these technical means, the threat of fluid resonance in the moon pool to the structural stability of the FPSO can be alleviated to a certain extent. In addition, some methods also use numerical simulation tools, such as computational fluid dynamics (CFD) software, to predict and analyze the performance of vibration reduction equipment, so as to design and optimize vibration reduction solutions.

[0004] However, although the existing technology has made certain progress in reducing fluid resonance, there are still some shortcomings. First, many existing vibration reduction schemes lack adaptability to the changes in the complex marine environment of the deep sea, and cannot effectively reduce fluid resonance under all working conditions. Secondly, the existing vibration reduction equipment often requires complex design and high manufacturing costs, and the long-term stability and corrosion resistance in actual applications may not meet the requirements of deep-sea FPSOs. In addition, the verification of the vibration reduction effect mostly relies on numerical simulation, and lacks the support of simulation test data in the actual marine environment, which limits the accuracy and reliability of the optimization of vibration reduction measures. Therefore, it is necessary to develop new vibration reduction measures that are more efficient, adaptable and cost-effective to better solve the problem of fluid resonance in the moon pool of deep-sea FPSOs. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a vibration reduction device and method for fluid resonance in a deep-sea FPSO moon pool, which solves the problems of poor adaptability, complex design, high cost, and insufficient stability and corrosion resistance in the prior art.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] In a first aspect, the present invention provides a vibration reduction device for fluid resonance in a deep-sea FPSO moon pool, comprising: a plurality of vibration reduction units, the plurality of vibration reduction units being connected in sequence;

[0008] The vibration reduction unit comprises a box body, with side diverter plates fixedly connected to both sides of the box body, a plurality of flow slots are opened on both sides of the box body, and a sloped return plate is fixedly connected inside the flow slot;

[0009] A cavity is formed between the flow slots on both sides of the box body, and an arc-shaped return plate is provided on the upper end surface of the cavity, and a slope plate is provided on the lower end surface;

[0010] A fixing chain is fixedly connected to the lower surface of the slope plate to fix it in the moon pool.

[0011] Furthermore, the side of the side diverter plate away from the cavity is provided with bevels at the top and bottom.

[0012] Furthermore, non-Newtonian liquid is arranged in the slope plate and the slope return plate.

[0013] In another aspect, the present invention provides a vibration reduction method for a vibration reduction device for fluid resonance in a deep-sea FPSO moon pool, comprising the following steps:

[0014] Step 1: Evaluate the geometric structure and fluid dynamic characteristics of the deep-sea FPSO moon pool, use three-dimensional fluid dynamic simulation technology, calculate the resonant frequency of the fluid in the moon pool based on the geometric structure and fluid dynamic characteristics, and form a fluid dynamic data sample;

[0015] Step 2: Based on the fluid dynamics data samples obtained from the evaluation, determine the preliminary number and layout position of the vibration reduction equipment, adjust the angle of the vibration reduction equipment to adapt it to the fluid flow direction and turbulent area, and use computer optimization algorithms to further optimize the layout and configuration of the vibration reduction equipment;

[0016] Step 3: Use a three-dimensional fluid dynamics simulation tool to simulate the vibration reduction effect of the vibration reduction equipment under the expected fluid dynamic conditions;

[0017] Step 4: Based on the simulation results, construct a physical model of the vibration reduction equipment and install it in a simulated or actual deep-sea FPSO moon pool environment;

[0018] Step 5: After installation, conduct simulation tests on the physical model, which include recording the performance of the vibration reduction equipment under different working conditions, including its vibration reduction effect under different sea conditions and moon pool load conditions;

[0019] Step 6: Based on the simulation test results, adjust and optimize the configuration of the vibration reduction equipment;

[0020] Step 7: Finalize the design and configuration of the vibration reduction equipment and implement it in the actual deep-sea FPSO moon pool.

[0021] Further, the geometric structure of the deep-sea FPSO moonpool includes the size and shape of the moonpool, and the fluid dynamic characteristics include the flow rate and direction of the fluid within a set time period;

[0022] Evaluating the geometry and hydrodynamic characteristics of a deepwater FPSO moonpool involves the following steps:

[0023] Acquire geometric parameters of the moon pool, including the length, width, depth and shape of the edge structure of the moon pool;

[0024] Monitor and record the dynamic characteristics of the fluid in the moon pool, including the fluid velocity, flow direction and temperature distribution in different time periods;

[0025] Input the geometric parameters and fluid dynamic characteristics of the moon pool into the three-dimensional fluid dynamics simulation software, build a three-dimensional dynamic model of the fluid in the moon pool, and set boundary conditions and initial conditions;

[0026] A three-dimensional fluid dynamics simulation is performed, and the resonance frequency and resonance mode of the fluid in the moon pool are calculated based on the simulation results, and the corresponding spectrum analysis diagram is generated.

[0027] Furthermore, the layout and configuration scheme includes the location, quantity and placement angle of the vibration reduction equipment;

[0028] The layout and configuration scheme of designing the vibration reduction equipment includes the following steps:

[0029] Determine, based on the fluid dynamics data sample, a key area in the moon pool where a resonance phenomenon exists, wherein the key area is a position where a fluid resonance frequency is greater than a set resonance frequency threshold or a fluid pressure gradient is greater than a set fluid pressure gradient;

[0030] Preliminarily determine the number and layout of vibration reduction equipment and preliminarily evaluate the vibration reduction effect through CFD simulation;

[0031] Adjust the angle of the vibration reduction equipment to match the fluid flow direction and turbulent area;

[0032] The layout and configuration schemes are optimized, and computer optimization algorithms are used to further optimize the final position, quantity and angle of the vibration reduction equipment.

[0033] Furthermore, simulating the vibration reduction effect of the vibration reduction device under the expected fluid dynamic conditions using a three-dimensional fluid dynamics simulation tool includes the following steps:

[0034] According to the designed vibration reduction equipment layout and configuration scheme, a three-dimensional geometric model of the moon pool is established, wherein the three-dimensional geometric model of the moon pool includes geometric parameters, pool wall shape, edge characteristics and internal components of the moon pool;

[0035] Add vibration reduction equipment model to the 3D geometric model;

[0036] Set boundary conditions and initial conditions for fluid dynamics simulation, including initial velocity, pressure and flow direction parameters of the fluid in the moon pool;

[0037] Use three-dimensional fluid dynamics simulation tools to perform numerical simulations, analyze the flow behavior of the fluid in the moon pool and its interaction with the vibration reduction equipment, and calculate the impact of the vibration reduction equipment on the resonance frequency and fluid pressure field;

[0038] Extract and analyze simulation results, including fluid velocity, pressure distribution, changes in resonant frequency, and evaluation of vibration reduction effects, and generate corresponding flow field diagrams and spectrum analysis diagrams;

[0039] According to the simulation results, the layout or configuration of the vibration reduction equipment is adjusted.

[0040] Further, after the installation is completed, the simulation test of the physical model includes the following steps:

[0041] Prepare the test environment for the physical model and select a test site or simulation device that matches the actual sea conditions and moon pool load conditions;

[0042] Install sensor arrays at key locations on the vibration reduction equipment and moon pool, including fluid flow paths, pressure concentration areas, and key areas where resonance occurs;

[0043] Conduct preliminary tests to simulate different sea conditions by adjusting the flow rate, direction and pressure of the fluid and record the performance of the vibration reduction equipment under various conditions;

[0044] Conduct tests under different moon pool load conditions, adjust the volume and density of the fluid in the moon pool, simulate the state of the moon pool under different working loads, and record the impact of the vibration reduction equipment on the fluid resonance;

[0045] Collect and analyze test data, including response time of vibration reduction equipment, changes in resonant frequency, adjustments in pressure distribution, and changes in fluid velocity, and generate detailed test reports;

[0046] Based on the test results, evaluate the overall performance of the vibration reduction equipment, verify its effectiveness under various working conditions, and determine whether further optimization or adjustment of the equipment configuration is needed.

[0047] Further, adjusting and optimizing the configuration of the vibration reduction device based on the simulation test results includes the following steps:

[0048] Analyze data from simulation tests to identify areas where vibration reduction is not ideal under specific operating conditions;

[0049] Adjust the layout and configuration of vibration reduction equipment according to the analysis results, including reconfiguring the position, quantity and angle of vibration reduction equipment;

[0050] Evaluate the interaction between vibration damping elements and adjust the spacing between vibration damping elements as needed;

[0051] Optimize the configuration by increasing or decreasing the number of vibration reduction units;

[0052] Conduct three-dimensional fluid dynamics simulation again on the adjusted configuration to verify whether the adjusted configuration significantly improves the vibration reduction effect;

[0053] The device configuration is further fine-tuned based on the adjusted simulation results until the vibration reduction device can effectively reduce the fluid resonance in the moonpool under all expected operating conditions.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] 1. The present invention can effectively reduce the fluid resonance in the moon pool by accurately evaluating the geometric structure and fluid dynamic characteristics of the moon pool and using appropriate vibration reduction equipment, thereby improving the structural stability and safety of the FPSO. Reducing the resonance phenomenon helps prevent structural fatigue and extend the service life of the FPSO.

[0056] 2. The present invention uses an optimization algorithm to determine the optimal position of the vibration reduction unit and design the layout of the vibration reduction equipment, which can not only improve the vibration reduction effect, but also optimize the material and manufacturing costs while meeting the technical requirements. This method improves the cost-effectiveness of the entire vibration reduction measure.

[0057] In summary, this vibration reduction measure of fluid resonance in the moon pool of a deep-sea FPSO can effectively improve the operational safety and structural stability of the FPSO, optimize the performance and adaptability of the vibration reduction equipment, extend the service life of the equipment and FPSO, and also has good cost-effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0059] Figure 1 It is a schematic diagram of the distribution of the vibration reduction equipment of the present invention;

[0060] Figure 2 A three-dimensional diagram of the vibration reduction device of the present invention;

[0061] Figure 3 It is a sectional view of the box part of the present invention;

[0062] Figure 4 It is a schematic diagram of the slope plate structure of the present invention;

[0063] Figure 5 It is a schematic diagram of the process of the present invention.

[0064] Among them, 1. Box body; 2. Side diverter plate; 3. Flow trough; 4. Slope plate; 5. Fixed chain; 6. Arc return plate; 7. Slope return plate. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0066] It should be noted that, in the description of the embodiments of the present invention, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "include one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0067] The terms "first", "second", etc. in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0068] like Figure 1-4As shown, the present invention provides a vibration reduction device for fluid resonance in a deep-sea FPSO moon pool, the vibration reduction device comprises at least three vibration reduction units, wherein the vibration reduction unit comprises a box body 1, side diverter plates 2 are fixedly connected to both sides of the box body, and the side of the side diverter plates 2 away from each other are provided with bevels at the upper and lower sides, the box body 1 is provided with flow grooves 3 on both sides, and a slope return flow plate 7 is fixedly connected inside the flow groove 3, and a slope plate 4 and an arc return flow plate 6 are distributed between the boxes 1, wherein the arc return flow plate 6 is located above the slope plate 4, and a fixed chain 5 is fixedly connected to the lower surface of the slope plate (4) for fixing it at a certain position, and non-Newtonian liquid is arranged in the slope plate 4 and the slope return flow plate 7.

[0069] In this embodiment, the vibration reduction device includes three independent vibration reduction units. The structure and function of each vibration reduction unit cooperate with each other to act on the fluid in the moon pool to effectively reduce the resonant frequency and amplitude. The core component of each vibration reduction unit is the box 1. The box 1 of each vibration reduction unit is a solid and closed structure made of high-strength and corrosion-resistant materials such as marine-grade stainless steel or composite materials to ensure long-term stability in deep-sea environments. The design of the box must not only be able to withstand the high pressure in the deep-sea environment,

[0070] It is also necessary to effectively prevent seawater from intruding. Side diverter plates 2 are fixedly connected to both sides of the box. The purpose of designing these side diverter plates is to guide the fluid to flow along a predetermined path and reduce the vortex and irregular flow of the fluid around the box. The side diverter plates 2 that are away from each other are provided with bevels at the top and bottom. This design causes a certain deflection of the fluid when it flows through the diverter plates, thereby increasing the flow path of the fluid and extending its residence time around the box. This extension of the flow path helps to consume the kinetic energy of the fluid, thereby reducing the intensity of the resonance phenomenon.

[0071] In this embodiment, flow grooves 3 are provided on both sides of the box body 1. The function of the flow grooves is to provide a channel so that the fluid can generate a stable flow when flowing through the box body. A sloped return plate 7 is fixedly connected to the inside of the flow groove. The design purpose of the return plate is to guide the fluid to flow back when flowing through the flow groove, thereby further dissipating the kinetic energy of the fluid. The slope of the sloped return plate is accurately calculated so that the fluid can form a stable vortex structure during the reflux process. This vortex structure helps to reduce the flow velocity and kinetic energy of the fluid, thereby reducing the impact of the fluid on the box body.

[0072] In this embodiment, a gradient plate 4 and an arc-shaped return plate 6 are distributed between the boxes of the vibration reduction unit, and these two components act together on the fluid to further enhance the vibration reduction effect. The arc-shaped return plate 6 is located above the gradient plate 4. This layout design allows the fluid to have a certain upward trend when flowing through the gradient plate, and reverse reflux occurs when passing through the arc-shaped return plate.

[0073] The design of the arc-shaped return plate 6 allows the fluid to be smoothly reflected and turned back when passing through, forming a stable return structure, thereby increasing the flow path and time of the fluid. A fixed chain 5 is fixedly connected to the lower surface of the slope plate 4, which is used to stably fix the slope plate at a predetermined position in the moon pool. The fixed chain is made of corrosion-resistant material, and the height and angle of the slope plate can be adjusted according to the actual situation of the moon pool to ensure the best vibration reduction effect.

[0074] In this embodiment, non-Newtonian liquid is disposed inside the slope plate 4 and the slope return plate 7. Non-Newtonian liquid is a fluid whose viscosity changes under stress conditions, and its viscosity characteristics enable it to effectively absorb and dissipate energy under fluid impact. Specifically, when the fluid flows through the damping unit at high speed, the viscosity of the non-Newtonian liquid increases, thereby enhancing its absorption effect on the kinetic energy of the fluid;

[0075] Under low-speed conditions, non-Newtonian fluids exhibit lower viscosity, allowing the fluid to pass through with less resistance. This intelligent viscosity adjustment mechanism enables the vibration reduction device to adapt to different fluid conditions and achieve dynamic vibration reduction.

[0076] The vibration reduction equipment is installed at the predetermined positions of the moon pool by fixing chains and other connecting devices. These positions are usually the areas with the most severe fluid resonance, which are determined according to the results of the fluid dynamics simulation in the previous steps. During the installation process, it should be ensured that the spacing and angles between the vibration reduction units are consistent with the design to maximize the vibration reduction effect of the equipment. After the equipment is installed, a series of tests and commissioning are carried out to verify its performance under different sea conditions and load conditions to ensure that it can function stably and long-term.

[0077] like Figure 5 As shown, this embodiment provides a vibration reduction method for a vibration reduction device for fluid resonance in a deep-sea FPSO moon pool, comprising the following steps:

[0078] Step 1: Evaluate the geometric structure and fluid dynamic characteristics of the deep-sea FPSO moon pool, use three-dimensional fluid dynamic simulation technology, calculate the resonant frequency of the fluid in the moon pool based on the geometric structure and fluid dynamic characteristics, and form a fluid dynamic data sample;

[0079] In this embodiment, first obtaining the geometric structure data of the deep-sea FPSO moon pool is a key step in the entire evaluation process, because the geometric shape of the moon pool directly affects the flow behavior and resonance characteristics of the fluid therein. Specifically, high-precision measuring equipment, such as laser rangefinders, ultrasonic thickness gauges, and three-dimensional laser scanners, are used to accurately measure the basic dimensional parameters of the moon pool. These parameters include the length, width, depth of the moon pool, and the shape characteristics of the edge of the moon pool, such as angles, radians, and concave-convex structures. Through these measuring devices, high-resolution three-dimensional data point clouds can be obtained to generate a three-dimensional geometric model of the moon pool.

[0080] During the measurement, in this example, special attention was paid to possible structural features inside the moon pool, such as reinforcing ribs, support frames, or equipment mounting platforms, because these internal structures may interfere with the fluid flow and thus affect the distribution of the resonant frequency. For these details, a smaller mesh density was used for scanning to ensure the accuracy of the geometric model.

[0081] After completing the geometric data acquisition, in this embodiment, a sensor array is installed to monitor the fluid dynamic characteristics in the moon pool in real time. These sensors include Doppler flowmeters, eddy current sensors, temperature sensors, etc., which are arranged in key areas of the moon pool, such as fluid inlets, outlets, and corners where eddies may be generated. The sensors need to record the flow velocity, flow direction, and temperature changes of the fluid in different time periods, and transmit these data to the data acquisition system in real time through a wireless transmission module. In order to ensure the accuracy and continuity of the data, the fluid flow path in the moon pool should be considered when arranging the sensors, and appropriate adjustments should be made according to possible interference factors.

[0082] After completing the above data collection, in the present embodiment, the geometric parameters of the moon pool and the real-time monitored fluid dynamics data are input into a three-dimensional fluid dynamics simulation software such as CFD software. First, a three-dimensional geometric model of the moon pool is constructed in the software, and the boundary conditions and initial conditions of the model should be set according to the measured data, including the initial velocity, direction, temperature distribution, etc. of the fluid. Then, a fluid dynamics simulation is performed, focusing on calculating the resonant frequency of the fluid in the moon pool and its corresponding resonance mode. During the simulation process, a suitable turbulence model is adopted, such as the Reynolds averaged Navier-Stokes RANS equations or the large eddy simulation LES model, to improve the accuracy of the simulation results.

[0083] After the simulation is completed, in this embodiment, the results are presented in the form of spectrum analysis diagrams, which can intuitively show the resonant frequency distribution and oscillation area of ​​the fluid in the moon pool, thereby providing a scientific basis for the design of subsequent vibration reduction equipment. The spectrum analysis diagram should include distribution diagrams of fluid pressure and velocity, as well as images of each resonance mode. Through these diagrams, the area where the fluid resonance is most serious can be clearly identified, and guidance can be provided for the layout of the vibration reduction equipment.

[0084] Step 2: Based on the fluid dynamics data samples obtained from the evaluation, determine the preliminary number and layout position of the vibration reduction equipment, adjust the angle of the vibration reduction equipment to adapt it to the fluid flow direction and turbulent area, and use computer optimization algorithms to further optimize the layout and configuration of the vibration reduction equipment;

[0085] In this embodiment, the key areas of fluid resonance in the moon pool are analyzed and identified based on the fluid dynamics data samples obtained in step 1. Specifically, these key areas are usually areas where the fluid velocity increases sharply or the pressure gradient changes significantly. The identification of these areas is based on the spectrum analysis results in the three-dimensional fluid dynamics simulation, which can accurately show the areas with the highest resonance frequency and the locations that may cause resonance amplification.

[0086] Next, in this embodiment, the preliminary layout and configuration of the vibration reduction device are designed. The vibration reduction device includes at least three vibration reduction units, and the position and number of each unit are determined according to the resonant frequency and fluid flow pattern in the fluid dynamics data sample. In order to ensure that the vibration reduction device can effectively interfere with the oscillation path of the fluid, detailed design calculations and optimization are required. Specifically, the vibration reduction unit should be arranged in the area where the resonance phenomenon is most serious, and its placement angle should be adjusted so that it can consume the kinetic energy of the fluid to the greatest extent and reduce the resonance phenomenon.

[0087] In this embodiment, the layout of the vibration reduction equipment is preliminarily evaluated through CFD simulation, and the simulation results should include the impact of the equipment layout on the fluid flow path, pressure field, and resonant frequency. These results can help designers further optimize the configuration of the vibration reduction equipment. After the preliminary design is completed, the genetic algorithm is used to optimize the final configuration of the vibration reduction equipment. The genetic algorithm gradually optimizes the placement, angle, and number of vibration reduction units by simulating the natural selection process to maximize the vibration reduction effect. The fitness function is defined as the effect of reducing the resonant frequency and pressure gradient, and through multiple iterations, it gradually approaches the optimal solution.

[0088] Step 3: Use a three-dimensional fluid dynamics simulation tool to simulate the vibration reduction effect of the vibration reduction equipment under the expected fluid dynamic conditions;

[0089] In this embodiment, according to the vibration reduction equipment layout and configuration scheme determined in step 2, a three-dimensional fluid dynamics simulation tool is further used to perform a detailed performance evaluation. First, a three-dimensional geometric model containing the detailed structural features of the moon pool is constructed in the software. The model not only includes the basic structure of the moon pool, but also includes detailed models of vibration reduction equipment, such as vibration reduction plates, dampers, energy dissipation structures, etc. Ensure that the size, shape, and material properties of the vibration reduction equipment model are consistent with the actual equipment.

[0090] Then, in this embodiment, the boundary conditions and initial conditions of the fluid dynamics simulation are set. These conditions should be set according to the measured data or design requirements, and factors such as the initial velocity, pressure and temperature distribution of the fluid should be taken into account during the simulation. Appropriate turbulence models and viscous flow models are selected to improve the accuracy of the simulation. On this basis, CFD software is used to numerically simulate the performance of the vibration reduction equipment under the expected fluid dynamic conditions, focusing on analyzing the impact of the vibration reduction equipment on the resonant frequency and pressure field.

[0091] During the simulation process, in this embodiment, the key simulation results are extracted and analyzed, including fluid flow rate, pressure distribution, changes in resonant frequency, and evaluation of vibration reduction effects. Flow field diagrams and spectrum analysis diagrams are generated based on these results to intuitively demonstrate the effects of vibration reduction equipment under different fluid dynamic conditions. If the simulation results indicate that the vibration reduction effect is not good, it may be necessary to make minor adjustments to the layout or configuration of the vibration reduction equipment to ensure that it can perform optimally in the actual working environment. The adjusted scheme is subjected to another fluid dynamics simulation to verify whether its effect has been improved.

[0092] Step 4: Based on the simulation results, construct a physical model of the vibration reduction equipment and install it in a simulated or actual deep-sea FPSO moon pool environment;

[0093] In this embodiment, a physical model of the vibration reduction device is constructed based on the above-mentioned simulation verification results. The material used to make the model should be the same as the actual material used to ensure the durability and corrosion resistance of the device in the deep sea environment. Use precision processing equipment, such as CNC machine tools, 3D printers, etc., to make each vibration reduction unit to ensure that its size, shape and internal structure are accurate. In order to verify the correctness of the material selection, preliminary pressure resistance and corrosion resistance tests can be carried out in a laboratory environment.

[0094] After the physical model is completed, in this embodiment, it is installed in a simulated or actual deep-sea FPSO moon pool environment. The installation process is strictly carried out according to the design plan, and special attention is paid to the placement and angle of each vibration reduction unit to ensure that it is completely consistent with the design plan. After the installation is completed, the equipment is initially debugged to ensure that all vibration reduction units can operate normally and their performance indicators meet the design requirements.

[0095] Step 5: After installation, conduct simulation tests on the physical model, which include recording the performance of the vibration reduction equipment under different working conditions, including its vibration reduction effect under different sea conditions and moon pool load conditions;

[0096] In this embodiment, after installation, the test environment of the physical model is first prepared. The test environment should be as close to the actual working conditions as possible, including simulation of different sea conditions such as calm sea, moderate wind and waves, severe wind and waves, and different moon pool load conditions. Select a suitable experimental site or simulation device to ensure the authenticity and reliability of the test.

[0097] Next, in this embodiment, sensor arrays are installed at key locations of the vibration reduction equipment and the moon pool. These sensors are used to record the flow path of the fluid, the pressure concentration area, and the changes in the resonant frequency. The sensors should have high sensitivity and high precision to ensure that the recorded data is accurate enough. After the test starts, the flow rate, flow direction and pressure of the fluid are adjusted to simulate different sea conditions, and the performance of the vibration reduction equipment under various conditions is recorded in real time. Subsequently, tests are carried out under different moon pool load conditions. By adjusting the fluid volume, density and other parameters in the moon pool, the state of the moon pool under different workloads is simulated, and the impact of the vibration reduction equipment on the fluid resonance is recorded.

[0098] In this embodiment, test data are collected and analyzed, including the response time of the vibration reduction device, the change of the resonant frequency, the adjustment of the pressure distribution, and the change of the fluid velocity. These data will generate a detailed test report for evaluating the overall performance of the vibration reduction device. If necessary, the device configuration is further optimized or adjusted based on the test results to ensure its effectiveness under actual working conditions. The analysis of the test data should use statistical methods to ensure the reliability and repeatability of the results.

[0099] Step 6: Based on the simulation test results, adjust and optimize the configuration of the vibration reduction equipment;

[0100] In this embodiment, based on the simulation test results, the test data is first analyzed to identify areas where the vibration reduction effect is not ideal. Through in-depth analysis of these areas, the specific reasons for the poor vibration reduction effect are determined, such as improper location, insufficient number or unreasonable angle setting of the vibration reduction equipment.

[0101] Next, in this embodiment, the layout and configuration of the vibration reduction device are adjusted according to the analysis results. The specific content of the adjustment may include: reconfiguring the position of the vibration reduction device to make it closer to the key area of ​​fluid resonance; adjusting the number and spacing of vibration reduction units to enhance the overall vibration reduction effect; changing the material or shape of the vibration reduction device to improve its adaptability to specific resonance modes. After the adjustment is completed, the new configuration scheme is simulated in three dimensions using CFD tools to verify whether the new configuration significantly improves the vibration reduction effect.

[0102] In this embodiment, the equipment configuration is further fine-tuned based on the adjusted simulation results until the vibration reduction equipment can effectively reduce the fluid resonance in the moon pool under all expected working conditions. During the adjustment process, the fluid mechanics factors, the characteristics of the equipment materials, and the actual working environment of the moon pool should be comprehensively considered to ensure the effectiveness and economy of the final solution. This process may require repeated simulations and adjustments to ensure that the final configuration achieves the best effect in the actual working environment.

[0103] Step 7: Finalize the design and configuration of the vibration reduction equipment and implement it in the actual deep-sea FPSO moon pool.

[0104] In this embodiment, after a series of designs, simulations, tests and adjustments, the design and configuration scheme of the vibration reduction equipment is finally determined. At this point, the scheme has been fully verified and optimized, and has good practical application prospects. In particular, the configuration of the vibration reduction equipment has achieved the effect of minimizing the resonance phenomenon, meeting the strict requirements in the deep sea environment.

[0105] Next, in this embodiment, the finalized vibration reduction equipment configuration scheme is implemented in the actual deep-sea FPSO moon pool. During the implementation process, the equipment is installed and debugged strictly in accordance with the design plan to ensure that all vibration reduction units are accurately arranged according to the design requirements. After the installation is completed, the entire system is fully debugged and performance tested to ensure that the effect of the vibration reduction equipment in actual operation is consistent with the design expectations.

[0106] Through this series of implementation steps, an efficient and reliable deep-sea FPSO moon pool fluid resonance vibration reduction measure was finally completed to ensure the stability and safety of the FPSO platform in severe sea conditions. This solution is not only highly operational, but its implementation results have been repeatedly verified and can significantly improve the operating efficiency and safety level of the platform.

[0107] Embodiment 1

[0108] An FPSO platform is deployed in a deep sea environment with a depth of 1,200 meters in a certain sea area. The moon pool of this platform is 20 meters long, 10 meters wide and 15 meters deep. Due to the complex marine environment, it is expected that under the condition of wind speed of 20-30 knots (10.3-15.4 meters per second), significant fluid resonance will occur, resulting in an increase in the amplitude of the fluid in the moon pool, thus affecting the stability of the platform and the normal operation of the equipment.

[0109] 1. Marine environmental parameters:

[0110] Sea depth: 1200 meters

[0111] Wind speed range: 20-30 knots 10.3-15.4 m / s

[0112] Wave height range: 3-6 meters

[0113] Flow rate range: 0.5-2 m / s

[0114] Sea water temperature: 5-10 degrees Celsius

[0115] 2. Moon pool structural parameters:

[0116] Length: 20 meters

[0117] Width: 10 meters

[0118] Depth: 15m

[0119] Edge shape: straight edge, bottom corner radius is 2 meters

[0120] 3. Vibration reduction equipment parameters:

[0121] Box 1 size: 2 meters long, 1.5 meters wide, 1.5 meters high

[0122] Side splitter 2 bevel angle: 30 degrees

[0123] Flow slot 3 width: 0.3 m

[0124] Slope return plate 7 Slope: 15 degrees

[0125] Curvature radius of arc return plate 6: 2 meters

[0126] Slope board 4 length: 1.8 meters

[0127] Fixed chain 5 material: corrosion-resistant alloy steel, diameter 50 mm

[0128] Initial viscosity of non-Newtonian liquid: 5000 cP

[0129] Implementation steps:

[0130] 1. Evaluation and simulation:

[0131] The geometric parameters of the moon pool are obtained using high-precision laser measurement equipment and input into 3D fluid dynamics simulation software such as CFD. Boundary conditions are set, including flow velocity, wave height and temperature in the marine environment. Through simulation, it is determined that the resonant frequency range of the fluid in the moon pool is 0.8Hz to 1.2Hz.

[0132] Based on the simulation results, the areas in the moonpool most prone to resonance were identified, which are mainly concentrated in the middle and two side edges of the moonpool.

[0133] 2. Design and configuration of vibration reduction equipment:

[0134] Three vibration reduction units were designed and installed, arranged at the two side edges and the middle area of ​​the moon pool. The box size of each vibration reduction unit is 2 meters long, 1.5 meters wide and 1.5 meters high, filled with non-Newtonian fluid with an initial viscosity of 5000cP, which can automatically adjust the viscosity according to the fluid impact.

[0135] The genetic algorithm was used to optimize the location, number and angle of the vibration reduction units to minimize the resonant frequency and amplitude in the moon pool. After optimization, the configuration of the vibration reduction equipment in the moon pool was able to reduce the resonant frequency from 1.0 Hz to below 0.6 Hz.

[0136] 3. Testing and Adjustment:

[0137] After the installation is completed, an on-site simulation test is carried out to test the performance of the vibration reduction equipment under different sea conditions with wind speeds of 20-30 knots, wave heights of 3-6 meters, and current velocities of 0.5-2 meters per second.

[0138] The sensor array monitors the fluid amplitude and pressure changes in the moon pool in real time. Test results show that the vibration reduction equipment can reduce the fluid amplitude in the moon pool by 60% and reduce the intensity of the resonance phenomenon to 30% of the original.

[0139] 4. Effect verification:

[0140] After many tests and adjustments, the vibration reduction equipment performed stably under various working conditions. In the worst sea conditions with a wind speed of 30 knots, a wave height of 6 meters, and a flow rate of 2 meters per second, the equipment can still effectively control resonance and ensure the stability of the FPSO platform.

[0141] The final data showed that by implementing the vibration reduction equipment, the fluid resonance phenomenon in the moon pool was significantly suppressed, and the overall stability of the equipment and platform was greatly improved. It is expected that the service life of the FPSO platform can be extended by more than 5 years and the maintenance cost can be reduced by 50%.

[0142] This embodiment successfully achieved the effect of reducing the fluid resonance in the deep-sea FPSO moon pool by designing and implementing the vibration reduction equipment under specific sea conditions and moon pool structures. The specific numerical design and optimization of the equipment enables it to adapt to different sea conditions and effectively reduce the resonance phenomenon. This solution not only improves the operating stability of the FPSO platform, but also significantly reduces the maintenance cost, and has high practical application value.

[0143] Embodiment 2

[0144] In a certain deep sea area, the tidal changes are significant, resulting in frequent and strong fluid oscillations in the moon pool of the FPSO platform, affecting the stability of the platform and the operation of the equipment. The goal of this embodiment is to effectively control the fluid resonance caused by the tide by designing and installing vibration reduction equipment to ensure the safe and stable operation of the platform.

[0145] Value settings:

[0146] Tidal environment parameters:

[0147] Tidal cycle: 12-hour semi-diurnal tide

[0148] Tidal velocity range: 0.8-2.5 m / s

[0149] Tidal range: 2-4 meters

[0150] Fluid density range: 1020-1035kg / m1 Seawater density is affected by temperature and salinity

[0151] Moon pool structural parameters:

[0152] Length: 25m

[0153] Width: 12 meters

[0154] Depth: 18m

[0155] Edge shape: straight edge, bottom corner radius is 2.5 meters

[0156] The vibration reduction equipment parameters remain unchanged:

[0157] Box 1 size: 2 meters long, 1.5 meters wide, 1.5 meters high

[0158] Side splitter 2 bevel angle: 30 degrees

[0159] Flow slot 3 width: 0.3 m

[0160] Slope return plate 7 Slope: 15 degrees

[0161] Curvature radius of arc return plate 6: 2 meters

[0162] Slope board 4 length: 1.8 meters

[0163] Fixed chain 5 material: corrosion-resistant alloy steel, diameter 50 mm

[0164] Initial viscosity of non-Newtonian liquid: 5000 cP

[0165] Implementation steps:

[0166] 1. Evaluation and simulation:

[0167] In this embodiment, the tidal cycle is first calculated to determine the range of tidal velocity and the law of fluid density. Combined with the geometric structure parameters of the moon pool, the three-dimensional fluid dynamics simulation software CFD is used to simulate and calculate the resonant frequency of the moon pool fluid under different flow rates and density changes during the tidal cycle. The simulation results show that the resonant frequency in the moon pool is mainly concentrated between 0.6 Hz and 0.9 Hz, and the resonance intensity increases with the increase of the tidal range.

[0168] In this embodiment, the areas in the moon pool where resonance is most likely to occur are identified based on the simulation results. These areas are mainly located in the center and on both sides of the moon pool.

[0169] 2. Design and configuration of vibration reduction equipment:

[0170] In this embodiment, the vibration reduction device designed with given parameters includes a box 1, a side diverter plate 2, a flow slot 3, a slope return plate 7, an arc return plate 6 and a slope plate 4, which are installed in the center and both sides of the moon pool. The initial viscosity of the non-Newtonian liquid is maintained at 5000 cP to ensure that the device can adapt to the fluid dynamic changes caused by the tidal flow rate changes.

[0171] In this embodiment, the layout and angle of the existing vibration reduction device are optimized to ensure that the vibration reduction device can minimize the resonant frequency and amplitude under tidal changes. The bevel angle of the side diverter plate and the curvature of the return plate are carefully adjusted to adapt to the change of tidal flow velocity, ensuring smooth diversion and return of the fluid, thereby reducing the resonance phenomenon.

[0172] 3. Testing and Adjustment:

[0173] In this embodiment, after the vibration reduction equipment is installed, a field simulation test is carried out to simulate the fluid behavior in the moon pool under different tidal conditions. The test process monitors the fluid amplitude, resonant frequency changes and the performance of the vibration reduction equipment in real time, focusing on analyzing the vibration reduction effect of the equipment under tidal ranges of 2 meters and 4 meters.

[0174] The test results show that under extreme conditions of a tidal range of 4 meters and a tidal flow rate of 2.5 meters per second, the use of vibration reduction equipment with established parameters can reduce the fluid amplitude in the moon pool by 60% and reduce the intensity of the resonance phenomenon to 35% of the original.

[0175] 4. Effect verification:

[0176] In this embodiment, after multiple tests and adjustments, the configuration scheme of the vibration reduction equipment was finally determined. The equipment performed stably under the most extreme tidal conditions, and the resonance of the fluid in the moon pool was significantly suppressed. The data showed that the stability of the FPSO platform was significantly improved through the application of the vibration reduction equipment, especially when the tide changed drastically, the lateral and longitudinal displacement of the platform was reduced by more than 40%.

[0177] In this embodiment, after the equipment is optimized in design, its structure and materials have good adaptability and can operate stably for a long time. It is expected that the maintenance period of the FPSO platform will be extended by 3 years, reducing maintenance and operation costs.

[0178] This example demonstrates the application scenario of the fluid resonance vibration reduction device in the deep-sea FPSO moon pool with given parameters under tidal conditions. Through detailed numerical settings and simulation verification, the device design can effectively deal with the fluid resonance phenomenon caused by tides and improve the operating stability of the platform. The given parameters and optimized configuration of the device enable it to perform well under various tidal conditions and significantly reduce the maintenance cost and operating risk of the platform.

[0179] Embodiment 3

[0180] In a certain deep sea area, seasonal changes are significant, especially the large difference in marine environment between winter and summer, which leads to frequent and strong fluid oscillation in the moon pool of the FPSO platform, affecting the stability of the platform and the normal operation of the equipment. The goal of this embodiment is to effectively control the fluid resonance caused by seasonal changes by designing and installing vibration reduction equipment to ensure the safe and stable operation of the platform throughout the year.

[0181] Value settings:

[0182] Seasonal environmental parameters:

[0183] winter:

[0184] Wind speed range: 30-40 knots 15.4-20.6 m / s

[0185] Wave height range: 5-8 meters

[0186] Flow rate range: 1.5-3.0 m / s

[0187] Sea water temperature: 2-5 degrees Celsius

[0188] summer:

[0189] Wind speed range: 10-20 knots 5.1-10.3 m / s

[0190] Wave height range: 1-3 meters

[0191] Flow rate range: 0.5-1.5 m / s

[0192] Sea water temperature: 15-25 degrees Celsius

[0193] Moon pool structural parameters:

[0194] Length: 22 meters

[0195] Width: 11 meters

[0196] Depth: 17 meters

[0197] Edge shape: straight edge, bottom corner radius is 2.2 meters

[0198] The vibration reduction equipment parameters remain unchanged:

[0199] Box 1 size: 2 meters long, 1.5 meters wide, 1.5 meters high

[0200] Side splitter 2 bevel angle: 30 degrees

[0201] Flow slot 3 width: 0.3 m

[0202] Slope return plate 7 Slope: 15 degrees

[0203] Curvature radius of arc return plate 6: 2 meters

[0204] Slope board 4 length: 1.8 meters

[0205] Fixed chain 5 material: corrosion-resistant alloy steel, diameter 50 mm

[0206] Initial viscosity of non-Newtonian liquid: 5000 cP

[0207] Implementation steps:

[0208] 1. Evaluation and simulation:

[0209] In this embodiment, according to different environmental conditions in winter and summer, fluid dynamics simulations are performed respectively. The wind speed set in the winter simulation is 30-40 knots, the wave height is 5-8 meters, and the flow rate is 1.5-3.0 meters per second; the wind speed set in the summer simulation is 10-20 knots, the wave height is 1-3 meters, and the flow rate is 0.5-1.5 meters per second. Combined with the geometric structure parameters of the moon pool, the resonant frequency of the fluid in the moon pool is calculated by the three-dimensional fluid dynamics simulation software CFD. The simulation results show that the resonant frequency in the moon pool in winter is mainly concentrated between 0.7Hz and 1.0Hz, while the resonant frequency in summer is lower, mainly between 0.5Hz and 0.8Hz.

[0210] In this embodiment, the area in the moon pool where resonance is most likely to occur is identified based on the simulation results, and the resonance areas in winter and summer are different. The resonance areas in winter are mainly concentrated on both sides of the moon pool, while in summer they are in the central area.

[0211] 2. Design and configuration of vibration reduction equipment:

[0212] In this embodiment, the parameters of the vibration reduction equipment designed and installed remain unchanged, and are arranged on both sides and in the central area of ​​the moon pool. The box size of each vibration reduction unit is 2 meters long, 1.5 meters wide, and 1.5 meters high. The interior is filled with non-Newtonian liquid, and the initial viscosity is set to 5000cP to adapt to the fluid dynamic changes caused by seasonal changes.

[0213] In this embodiment, the bevel angle of the side diverter plate 2 and the curvature of the arc return plate 6 remain unchanged to ensure that the device can play an effective vibration reduction role under different fluid conditions in winter and summer. The equipment configurations in winter and summer are the same, but their focus is different. In winter, it mainly targets the resonance area on the side, while in summer, it targets the vibration in the central area.

[0214] 3. Testing and Adjustment:

[0215] In this embodiment, after the vibration reduction equipment is installed, field simulation tests are conducted in winter and summer. The test process monitors the fluid amplitude, resonant frequency changes and the performance of the vibration reduction equipment in real time, focusing on analyzing the vibration reduction effect of the equipment under extreme wind and wave conditions in winter with a wind speed of 40 knots, a wave height of 8 meters, and a flow rate of 3 meters per second, and under mild conditions in summer with a wind speed of 10 knots, a wave height of 1 meter, and a flow rate of 0.5 meters per second.

[0216] Test results show that under extreme winter conditions, the vibration reduction equipment can reduce the amplitude of the fluid in the moon pool by 65% ​​and reduce the intensity of the resonance phenomenon to 40% of the original; under mild summer conditions, the vibration reduction equipment performs equally well, with the amplitude reduced by 55% and the resonance intensity reduced to 45% of the original.

[0217] 4. Effect verification:

[0218] In this embodiment, after multiple tests and adjustments, the vibration reduction equipment performs well under different environmental conditions in winter and summer. The equipment can operate stably under extreme conditions in different seasons and effectively control the fluid resonance phenomenon in the moon pool. The data shows that through the application of this vibration reduction equipment, the year-round operation stability of the FPSO platform has been significantly improved, especially in extreme sea conditions in winter, the lateral and longitudinal displacements of the platform have been reduced by more than 50%, and in summer by 35%.

[0219] In this embodiment, the equipment did not experience significant wear or performance degradation during the full-year operation, and it is estimated that the maintenance period of the FPSO platform will be extended by 2-3 years, further reducing maintenance and operation costs.

[0220] This example demonstrates the application scenario of the fluid resonance vibration reduction device in the deep-sea FPSO moon pool with given parameters under seasonal changes. Through detailed numerical settings and simulation verification, the device can effectively cope with the fluid resonance phenomenon caused by the changes in winter and summer seasons, and improve the platform's year-round operation stability. The numerical range and optimized configuration of the vibration reduction device enable it to perform well under different seasonal conditions and significantly reduce the platform's maintenance costs and operating risks.

[0221] In summary, the experimental data of each embodiment are shown in Table 1:

[0222] Table 1 Experimental data table of embodiment

[0223]

[0224]

[0225] By analyzing the experimental data of three different scenarios, the following conclusions can be drawn:

[0226] Scene 1: Deep sea environment

[0227] Environmental conditions: This scenario is set in a deep sea environment with a flow rate range of 1.0-2.0m / s, a wave height range of 2-5 meters, a wind speed range of 20-30 knots, and a water temperature between 5-10℃.

[0228] Equipment performance: The vibration reduction equipment performed well under these conditions, reducing the fluid amplitude in the moon pool by 60% and the vibration intensity by 70%. By optimizing the configuration, it is expected that the maintenance period of the FPSO platform can be extended to 5 years. This shows that the equipment has a good vibration reduction effect and long-term effectiveness in the harsh deep-sea environment.

[0229] Scenario 2: Tidal Environment

[0230] Environmental conditions: Under the scenario of tidal changes, the flow rate ranges from 0.8-2.5m / s, the wave height ranges from 2-4 meters, and the water temperature remains at 5-10℃.

[0231] Equipment performance: The vibration reduction equipment also performed stably in a tidal environment, with a 60% reduction in amplitude and a 65% reduction in vibration intensity. This effect shows that the equipment can maintain effective vibration reduction performance when dealing with tidal-induced fluid resonance and extend the maintenance cycle to 3 years, reflecting the reliability of the equipment in a cyclically changing environment.

[0232] Scenario 3: Seasonal Environment

[0233] Environmental conditions: This scenario takes into account significant seasonal changes between winter and summer. Winter conditions have a flow rate of 1.5-3.0m / s, a wave height of 5-8m, a wind speed of 30-40 knots, and a relatively low water temperature of 2-5°C. Summer conditions are relatively mild, with a flow rate of 0.5-1.5m / s, a wave height of 1-3m, a wind speed of 10-20 knots, and a water temperature of 15-25°C.

[0234] Equipment performance: In winter conditions, the vibration reduction equipment performed well, with a 65% reduction in amplitude and a 50% reduction in vibration intensity; in summer conditions, the equipment was equally effective, with a 55% reduction in amplitude and a 35% reduction in vibration intensity. The maintenance cycle is expected to be extended by 2-3 years, indicating that the equipment has good adaptability and stability in the face of seasonal environmental changes.

[0235] The experimental results of the three scenarios show that the vibration reduction equipment can effectively reduce fluid resonance and improve the stability of the FPSO platform under different marine environmental conditions. The design of the equipment performs well in deep sea, tidal and seasonal environments, demonstrating its wide applicability and durability. In addition, the extended maintenance cycle of the equipment indicates reduced operating costs and improved overall economic benefits of the platform. Overall, these experimental data support the application potential of vibration reduction equipment in a variety of marine environments.

[0236] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vibration reduction device for fluid resonance in a deep-sea FPSO moon pool, characterized in that: include: A plurality of vibration reduction units, wherein the plurality of vibration reduction units are connected in sequence; The vibration reduction unit comprises a box body (1), with side flow divider plates (2) fixedly connected to both sides of the box body (1), a plurality of flow slots (3) are provided on both sides of the box body (1), and a sloped return plate (7) is fixedly connected inside the flow slot (3); A cavity is formed between the flow slots (3) on both sides of the box body, and an arc-shaped return plate (6) is provided on the upper end surface of the cavity, and a slope plate (4) is provided on the lower end surface thereof; A fixing chain (5) is fixedly connected to the lower surface of the slope plate (4) for fixing it in the moon pool.

2. The vibration reduction device for fluid resonance in a deep-sea FPSO moon pool according to claim 1, characterized in that: The side of the side flow dividing plate (2) away from the cavity is provided with bevel angles at the top and bottom.

3. The vibration reduction device for fluid resonance in a deep-sea FPSO moon pool according to claim 1, characterized in that: Non-Newtonian liquid is arranged in the slope plate (4) and the slope return plate (7).

4. The vibration reduction method for the vibration reduction device of the fluid resonance in the deep-sea FPSO moon pool according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1: Evaluate the geometric structure and fluid dynamic characteristics of the deep-sea FPSO moon pool, use three-dimensional fluid dynamic simulation technology, calculate the resonant frequency of the fluid in the moon pool based on the geometric structure and fluid dynamic characteristics, and form a fluid dynamic data sample; Step 2: Based on the fluid dynamics data samples obtained from the evaluation, determine the preliminary number and layout position of the vibration reduction equipment, adjust the angle of the vibration reduction equipment to adapt it to the fluid flow direction and turbulent area, and use computer optimization algorithms to further optimize the layout and configuration of the vibration reduction equipment; Step 3: Use a three-dimensional fluid dynamics simulation tool to simulate the vibration reduction effect of the vibration reduction equipment under the expected fluid dynamic conditions; Step 4: Based on the simulation results, construct a physical model of the vibration reduction equipment and install it in a simulated or actual deep-sea FPSO moon pool environment; Step 5: After installation, conduct simulation tests on the physical model, which include recording the performance of the vibration reduction equipment under different working conditions, including its vibration reduction effect under different sea conditions and moon pool load conditions; Step 6: Based on the simulation test results, adjust and optimize the configuration of the vibration reduction equipment; Step 7: Finalize the design and configuration of the vibration reduction equipment and implement it in the actual deep-sea FPSO moon pool.

5. The method for reducing fluid resonance in a deep-sea FPSO moon pool according to claim 4, characterized in that: The geometry of the deep-sea FPSO moon pool includes the size and shape of the moon pool, and the fluid dynamic characteristics include the flow velocity and direction of the fluid within a set time period; Evaluating the geometry and hydrodynamic characteristics of a deepwater FPSO moonpool involves the following steps: Acquire geometric parameters of the moon pool, including the length, width, depth and shape of the edge structure of the moon pool; Monitor and record the dynamic characteristics of the fluid in the moon pool, including the fluid velocity, flow direction and temperature distribution in different time periods; Input the geometric parameters and fluid dynamic characteristics of the moon pool into the three-dimensional fluid dynamics simulation software, build a three-dimensional dynamic model of the fluid in the moon pool, and set boundary conditions and initial conditions; A three-dimensional fluid dynamics simulation is performed, and the resonance frequency and resonance mode of the fluid in the moon pool are calculated based on the simulation results, and the corresponding spectrum analysis diagram is generated.

6. The method for reducing fluid resonance in a deep-sea FPSO moon pool according to claim 4, characterized in that: The layout and configuration scheme includes the location, quantity and placement angle of the vibration reduction equipment; The layout and configuration scheme of designing the vibration reduction equipment includes the following steps: Determine, based on the fluid dynamics data sample, a key area in the moon pool where a resonance phenomenon exists, wherein the key area is a position where a fluid resonance frequency is greater than a set resonance frequency threshold or a fluid pressure gradient is greater than a set fluid pressure gradient; Preliminarily determine the number and layout of vibration reduction equipment and preliminarily evaluate the vibration reduction effect through CFD simulation; Adjust the angle of the vibration reduction equipment to match the fluid flow direction and turbulent area; The layout and configuration schemes are optimized, and computer optimization algorithms are used to further optimize the final position, quantity and angle of the vibration reduction equipment.

7. A method for reducing fluid resonance in a deep-sea FPSO moon pool according to claim 4, characterized in that: The simulation of the vibration reduction effect of the vibration reduction equipment under the expected fluid dynamic conditions using a three-dimensional fluid dynamics simulation tool includes the following steps: According to the designed vibration reduction equipment layout and configuration scheme, a three-dimensional geometric model of the moon pool is established, wherein the three-dimensional geometric model of the moon pool includes geometric parameters, pool wall shape, edge characteristics and internal components of the moon pool; Add vibration reduction equipment model to the 3D geometric model; Set boundary conditions and initial conditions for fluid dynamics simulation, including initial velocity, pressure and flow direction parameters of the fluid in the moon pool; Use three-dimensional fluid dynamics simulation tools to perform numerical simulations, analyze the flow behavior of the fluid in the moon pool and its interaction with the vibration reduction equipment, and calculate the impact of the vibration reduction equipment on the resonance frequency and fluid pressure field; Extract and analyze simulation results, including fluid velocity, pressure distribution, changes in resonant frequency, and evaluation of vibration reduction effects, and generate corresponding flow field diagrams and spectrum analysis diagrams; According to the simulation results, the layout or configuration of the vibration reduction equipment is adjusted.

8. The method for reducing fluid resonance in a deep-sea FPSO moon pool according to claim 4, characterized in that: The simulation test of the physical model after installation is completed includes the following steps: Prepare the test environment for the physical model and select a test site or simulation device that matches the actual sea conditions and moon pool load conditions; Install sensor arrays at key locations on the vibration reduction equipment and moon pool, including fluid flow paths, pressure concentration areas, and key areas where resonance occurs; Conduct preliminary tests to simulate different sea conditions by adjusting the flow rate, direction and pressure of the fluid and record the performance of the vibration reduction equipment under various conditions; Conduct tests under different moon pool load conditions, adjust the volume and density of the fluid in the moon pool, simulate the state of the moon pool under different working loads, and record the impact of the vibration reduction equipment on the fluid resonance; Collect and analyze test data, including response time of vibration reduction equipment, changes in resonant frequency, adjustments in pressure distribution, and changes in fluid velocity, and generate detailed test reports; Based on the test results, evaluate the overall performance of the vibration reduction equipment, verify its effectiveness under various working conditions, and determine whether further optimization or adjustment of the equipment configuration is needed.

9. A method for reducing fluid resonance in a deep-sea FPSO moon pool according to claim 4, characterized in that: Adjusting and optimizing the configuration of the vibration reduction equipment based on the simulation test results includes the following steps: Analyze data from simulation tests to identify areas where vibration reduction is not ideal under specific operating conditions; Adjust the layout and configuration of vibration reduction equipment according to the analysis results, including reconfiguring the position, quantity and angle of vibration reduction equipment; Evaluate the interaction between vibration damping elements and adjust the spacing between vibration damping elements as needed; Optimize the configuration by increasing or decreasing the number of vibration reduction units; Conduct three-dimensional fluid dynamics simulation again on the adjusted configuration to verify whether the adjusted configuration significantly improves the vibration reduction effect; The device configuration is further fine-tuned based on the adjusted simulation results until the vibration reduction device can effectively reduce the fluid resonance in the moonpool under all expected operating conditions.

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