A fluid damping device and method for reducing resonance within a moonpool of a deep sea FPSO

Abstract

The application discloses a kind of deep sea FPSO moon pool fluid resonance damping equipment and method, comprising the following steps: step one, assess the geometric structure of deep sea FPSO moon pool and its fluid dynamics characteristics, the geometric structure includes the size and shape of moon pool, the fluid dynamics characteristics include the flow rate and direction of fluid in a set period, adopt three-dimensional fluid dynamics simulation technique, calculate the resonance frequency of fluid in moon pool based on the geometric structure and fluid dynamics characteristics;Step two, based on the fluid dynamics data sample obtained by evaluation, design the layout and configuration scheme of damping equipment, the damping equipment includes at least three damping units. By accurately evaluating the geometric structure of moon pool and fluid dynamic characteristics, and using suitable damping equipment, the fluid resonance in the moon pool can be effectively reduced, thereby improving the structural stability and safety of FPSO. Reducing resonance phenomenon helps to prevent structural fatigue and prolong the service life of FPSO.

Description

Technical Field

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

[0002] In the field of deep-sea oil and gas exploration, Floating Production Storage and Offloading (FPSO) units are important offshore production facilities that can process, store, and load / unload crude oil far from land. A key component of the FPSO's structural design is the moonpool, a vertically penetrating space at the center of the FPSO that facilitates drilling and riser deployment operations in deep sea. However, in the complex and variable deep-sea environment, significant fluid resonance can occur within the moonpool, negatively impacting the stability and safety of the FPSO.

[0003] To address the aforementioned challenges, various vibration reduction measures have been proposed in existing technologies. These measures primarily include installing vibration damping devices, such as damping units and flow dividers, within the lunar pool to alter the fluid flow direction or reduce fluid velocity, thereby mitigating the impact of fluid resonance. These techniques can, to some extent, mitigate the threat of fluid resonance within the lunar pool to the stability of the FPSO structure. Furthermore, some methods employ numerical simulation tools, such as computational fluid dynamics (CFD) software, to predict and analyze the performance of vibration damping devices, facilitating the design and optimization of vibration reduction schemes.

[0004] However, despite the progress made in reducing fluid resonance, existing technologies still have some shortcomings. First, many existing vibration reduction schemes lack adaptability to the complex and changing deep-sea environment and cannot effectively reduce fluid resonance under all operating conditions. Second, existing vibration reduction equipment often requires complex design and incurs high manufacturing costs, and its long-term stability and corrosion resistance in practical applications may not meet the requirements of deep-sea FPSOs. Furthermore, the verification of vibration reduction effects relies heavily on numerical simulations, lacking supporting simulation test data in actual marine environments, which limits the accuracy and reliability of vibration reduction optimization. Therefore, it is necessary to develop new, more efficient, adaptable, and cost-effective vibration reduction measures to better address the fluid resonance problem in the lunar pool of deep-sea FPSOs. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a vibration reduction device and method for fluid resonance in the lunar pool of a deep-sea FPSO, solving the problems of poor adaptability, complex design, high cost, and insufficient stability and corrosion resistance in existing technologies.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

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

[0008] The vibration damping unit includes a housing, with side diversion plates fixedly connected to both sides of the housing. Multiple flow channels are opened on both sides of the housing, and sloped return plates are fixedly connected inside the flow channels.

[0009] A cavity is formed between the flow channels on both sides of the box body. An arc-shaped return plate is provided on the upper end face of the cavity, and a slope plate is provided on its lower end face.

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

[0011] Furthermore, the side flow divider is provided with beveled angles on both the top and bottom sides of the side away from the cavity.

[0012] Furthermore, both the slope plate and the slope return plate are filled with non-Newtonian liquid.

[0013] On the other hand, the present invention provides a vibration reduction method for a vibration reduction device for fluid resonance in the lunar pool of a deep-sea FPSO, comprising the following steps:

[0014] Step 1: Evaluate the geometry and hydrodynamic characteristics of the lunar pool of the deep-sea FPSO. Using three-dimensional hydrodynamic simulation technology, calculate the resonant frequency of the fluid in the lunar pool based on the geometry and hydrodynamic characteristics, and form a hydrodynamic data sample.

[0015] Step 2: Based on the fluid dynamics data samples obtained from the evaluation, determine the initial number and layout of the vibration damping equipment, adjust the angle of the vibration damping equipment to adapt to the fluid flow direction and turbulent region, and use computer optimization algorithms to further optimize the layout and configuration scheme of the vibration damping equipment.

[0016] Step 3: Use three-dimensional fluid dynamics simulation tools 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 the simulated or actual deep-sea FPSO lunar pool environment.

[0018] Step 5: After installation, conduct a simulation test of the physical model. The test includes recording the performance of the vibration damping equipment under different working conditions, including its vibration damping effect under different sea states 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 scheme of the vibration reduction equipment and implement it in the actual deep-sea FPSO lunar pool.

[0021] Furthermore, the geometry of the deep-sea FPSO lunar pool includes the size and shape of the pool, and the hydrodynamic characteristics include the flow velocity and direction of the fluid over a set period of time;

[0022] The evaluation of the geometry and hydrodynamic characteristics of the lunar pool of a deep-sea FPSO includes the following steps:

[0023] Obtain the 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 lunar pool, including the fluid velocity, flow direction and temperature distribution over different time periods;

[0025] The geometric parameters and fluid dynamic characteristics of the lunar pool are input into a three-dimensional fluid dynamics simulation software to construct a three-dimensional dynamic model of the fluid in the lunar pool, and boundary conditions and initial conditions are set.

[0026] Three-dimensional fluid dynamics simulations were performed, and the resonant frequencies and resonant modes of the fluid in the lunar pool were calculated based on the simulation results, generating the corresponding spectral analysis diagrams.

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

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

[0029] Based on fluid dynamics data samples, key regions where resonance phenomena exist within the moon pool were identified. These key regions are locations where the fluid resonance frequency is greater than a set resonance frequency threshold or the fluid pressure gradient is greater than a set fluid pressure gradient.

[0030] The quantity and layout of vibration reduction equipment were initially determined, and the vibration reduction effect was initially evaluated through CFD simulation.

[0031] Adjust the angle of the vibration damping equipment to adapt to the direction of fluid flow and the turbulent region;

[0032] The layout and configuration scheme were optimized, and computer optimization algorithms were 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 equipment under the expected hydrodynamic conditions using three-dimensional fluid dynamics simulation tools includes the following steps:

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

[0035] Add a vibration damping device model to the three-dimensional geometric model;

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

[0037] Numerical simulations were performed using three-dimensional fluid dynamics simulation tools to analyze the flow behavior of fluid in the moon pool and its interaction with vibration damping equipment, and to calculate the impact of vibration damping equipment on resonant frequency and fluid pressure field.

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

[0039] Based on the simulation results, the layout or configuration of the vibration reduction equipment should be adjusted.

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

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

[0042] Install sensor arrays at key locations in vibration damping equipment and moon pools, including fluid flow paths, pressure concentration areas, and key areas where resonance occurs.

[0043] Preliminary tests were conducted to simulate different sea conditions by adjusting the fluid velocity, direction, and pressure, and to record the performance of the vibration reduction equipment under various conditions.

[0044] Experiments were conducted under different moon pool load conditions. By adjusting the fluid volume and density in the moon pool, the state of the moon pool under different working loads was simulated, and the influence of the vibration damping equipment on fluid resonance was recorded.

[0045] Collect and analyze test data, including the response time of vibration damping 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 damping equipment, verify its effectiveness under various working conditions, and determine whether further optimization or adjustment of the equipment configuration is needed.

[0047] Furthermore, adjusting and optimizing the configuration of vibration damping equipment based on simulation test results includes the following steps:

[0048] Analyze the data from the simulation test to identify areas where the vibration reduction effect is not ideal under specific working conditions;

[0049] Based on the analysis results, the layout and configuration of the vibration damping equipment were adjusted, including reconfiguring the location, quantity, and angle of the vibration damping equipment;

[0050] Assess the interaction between damping units and adjust the spacing between them as needed;

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

[0052] The adjusted configuration was simulated again using three-dimensional fluid dynamics to verify whether the adjusted configuration significantly improved the vibration reduction effect.

[0053] Based on the adjusted simulation results, the equipment configuration was further fine-tuned until the vibration damping equipment could effectively reduce fluid resonance in the moon pool under all expected operating conditions.

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

[0055] 1. This invention, by accurately assessing the geometry and fluid dynamics of the moonpool and employing suitable vibration damping equipment, effectively reduces fluid resonance within the moonpool, thereby improving the structural stability and safety of the FPSO. Reducing resonance helps prevent structural fatigue and extends the service life of the FPSO.

[0056] 2. This invention utilizes optimization algorithms to determine the optimal location of vibration damping units and design the layout scheme of vibration damping equipment. This not only improves the vibration damping effect but also optimizes material and manufacturing costs while meeting technical requirements. This method improves the cost-effectiveness of the entire vibration damping measure.

[0057] In summary, this vibration reduction measure for fluid resonance within the lunar 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 the FPSO, and also has good cost-effectiveness. Attached Figure Description

[0058] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

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

[0060] Figure 2 This is a perspective view of the vibration reduction device of the present invention;

[0061] Figure 3 This is a cross-sectional view of the housing portion of the present invention;

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

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

[0064] Among them, 1. Box body; 2. Side diversion plate; 3. Flow channel; 4. Slope plate; 5. Fixed chain; 6. Arc-shaped return plate; 7. Sloping return plate. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0066] It should be noted that, in the description of the embodiments of the present invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0067] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, without limiting the number of objects; for example, a first object can be one or more. Furthermore, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects have an "or" relationship.

[0068] like Figure 1-4As shown, the present invention provides a vibration reduction device for fluid resonance in the lunar pool of a deep-sea FPSO. The vibration reduction device includes at least three vibration reduction units, wherein each vibration reduction unit includes a housing 1, and side diversion plates 2 are fixedly connected to both sides of the housing. The side diversion plates 2 are provided with oblique angles on the upper and lower sides of the opposite side. Flow channels 3 are provided on both sides of the housing 1. Slope return plates 7 are fixedly connected inside the flow channels 3. Slope plates 4 and arc-shaped return plates 6 are distributed between the housings 1. The arc-shaped return plate 6 is located above the slope plate 4. A fixing chain 5 is fixedly connected to the lower surface of the slope plate (4) for fixing it in a certain position. Non-Newtonian liquid is provided inside the slope plate 4 and the slope return plate 7.

[0069] In this embodiment, the vibration damping device includes three independent vibration damping units. The structure and function of each unit work together to act on the fluid within the moon pool, effectively reducing the resonant frequency and amplitude. The core component of each vibration damping unit is the housing 1, which is a robust, sealed structure made of high-strength, corrosion-resistant materials such as marine-grade stainless steel or composite materials to ensure long-term stability in the deep-sea environment. The housing design must not only withstand the high pressure of the deep-sea environment,

[0070] It must also effectively prevent seawater intrusion. Side diversion plates 2 are fixedly connected to both sides of the tank. These side diversion plates are designed to guide the fluid along a predetermined path, reducing eddies and irregular flows around the tank. The side diversion plates 2 have beveled edges on both the top and bottom, causing a slight deflection of the fluid as it flows through them, thus increasing the fluid's flow path and prolonging its residence time around the tank. This extended flow path helps dissipate the fluid's kinetic energy, thereby reducing the intensity of resonance.

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

[0072] In this embodiment, a slope plate 4 and an arc-shaped return plate 6 are distributed between the housings of the vibration damping unit. These two components work together to enhance the vibration damping effect. The arc-shaped return plate 6 is located above the slope plate 4. This layout design causes the fluid to have a certain upward trend when flowing over the slope plate and to flow back in the opposite direction when passing through the arc-shaped return plate.

[0073] The arc-shaped return plate 6 is designed to cause smooth reflection and retraction of the fluid as it passes through, forming a stable return structure, thereby increasing the fluid's flow path and time. A fixing chain 5 is fixedly connected to the lower surface of the slope plate 4 to stably secure the slope plate at a predetermined position within the moon pool. The fixing chain is made of corrosion-resistant material, and the height and angle of the slope plate can be adjusted according to the actual conditions of the moon pool to ensure optimal vibration damping.

[0074] In this embodiment, both the slope plate 4 and the slope return plate 7 are filled with non-Newtonian fluid. A non-Newtonian fluid is a fluid whose viscosity changes under stress; its viscosity characteristics allow 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 fluid increases, thereby enhancing its absorption effect on fluid kinetic energy.

[0075] At low speeds, non-Newtonian fluids exhibit lower viscosity, allowing the fluid to pass through with less resistance. This intelligent viscosity regulation mechanism enables vibration damping equipment to adapt to different fluid conditions, achieving dynamic vibration reduction.

[0076] The vibration damping equipment is installed at predetermined locations in the moon pool via fixed chains and other connecting devices. These locations are typically the areas where fluid resonance is most severe, determined based on the fluid dynamics simulation results from the preceding steps. During installation, the spacing and angles between the damping units should be ensured to conform to the design to maximize the equipment's vibration damping effect. After installation, a series of tests and commissioning processes are conducted to verify its performance under different sea conditions and loads, ensuring its long-term stable operation.

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

[0078] Step 1: Evaluate the geometry and hydrodynamic characteristics of the lunar pool of the deep-sea FPSO. Using three-dimensional hydrodynamic simulation technology, calculate the resonant frequency of the fluid in the lunar pool based on the geometry and hydrodynamic characteristics, and form a hydrodynamic data sample.

[0079] In this embodiment, acquiring the geometric structure data of the lunar pool of the deep-sea FPSO is a crucial step in the entire evaluation process, as the geometry of the lunar pool directly affects the flow behavior and resonance characteristics of the fluid within it. Specifically, high-precision measuring equipment, such as laser rangefinders, ultrasonic thickness gauges, and 3D laser scanners, is used to accurately measure the basic dimensional parameters of the lunar pool. These parameters include the length, width, and depth of the lunar pool, as well as the shape features of the pool's edges, such as angles, curvature, and concave / convex structures. These measuring devices can obtain high-resolution 3D point cloud data, thereby generating a 3D geometric model of the lunar pool.

[0080] During the measurement process, in this embodiment, special attention was paid to potential structural features within the moon pool, such as reinforcing ribs, support frames, or equipment mounting platforms, as these internal structures could interfere with fluid flow and thus affect the distribution of resonant frequencies. For these details, a lower 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 dynamics characteristics within the lunar pool in real time. These sensors, including Doppler velocimeters, eddy current sensors, and temperature sensors, are positioned in key areas of the lunar pool, such as the fluid inlet, outlet, and corner locations where eddies may occur. The sensors need to record changes in fluid velocity, direction, and temperature at different time intervals and transmit this data to the data acquisition system in real time via a wireless transmission module. To ensure data accuracy and continuity, the sensor placement should consider the fluid flow path within the lunar pool and be appropriately adjusted based on potential interference factors.

[0082] After completing the aforementioned data acquisition, in this embodiment, the geometric parameters of the lunar pool and the real-time monitored fluid dynamics data are input into three-dimensional fluid dynamics simulation software, such as CFD software. First, a three-dimensional geometric model of the lunar pool is constructed in the software. The boundary conditions and initial conditions of the model should be set based on the measured data, including the initial velocity, direction, and temperature distribution of the fluid. Then, fluid dynamics simulation is performed, focusing on calculating the resonant frequencies of the fluid within the lunar pool and their corresponding resonant modes. During the simulation, a suitable turbulence model is used, 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 graphs. These graphs can intuitively show the resonant frequency distribution and oscillation regions of the fluid in the lunar pool, thus providing a scientific basis for the subsequent design of vibration damping equipment. The spectrum analysis graphs should include distribution maps of fluid pressure and velocity, as well as images of each resonance mode. Through these graphs, the regions with the most severe fluid resonance can be clearly identified, providing guidance for the placement of vibration damping equipment.

[0084] Step 2: Based on the fluid dynamics data samples obtained from the evaluation, determine the initial number and layout of the vibration damping equipment, adjust the angle of the vibration damping equipment to adapt to the fluid flow direction and turbulent region, and use computer optimization algorithms to further optimize the layout and configuration scheme of the vibration damping equipment.

[0085] In this embodiment, based on the fluid dynamics data samples obtained in step one, key regions of fluid resonance within the lunar pool are analyzed and identified. Specifically, these key regions are typically areas where the fluid velocity increases sharply or the pressure gradient changes significantly. The identification of these regions is based on spectral analysis results from three-dimensional fluid dynamics simulations, which can accurately display the regions with the highest resonance frequencies and the locations that may cause resonance amplification.

[0086] Next, in this embodiment, a preliminary layout and configuration scheme for the vibration damping device is designed. The vibration damping device includes at least three damping units, the position and number of which are determined based on the resonant frequency and fluid flow pattern in the fluid dynamics data sample. To ensure that the vibration damping device can effectively interfere with the oscillation path of the fluid, detailed design calculations and optimizations are required. Specifically, the damping units should be arranged in the area where the resonance phenomenon is most severe, and their placement angle should be adjusted to maximize the dissipation of the fluid's kinetic energy and reduce the resonance phenomenon.

[0087] In this embodiment, a preliminary evaluation of the vibration damping equipment layout is conducted using CFD simulation. The simulation results should include the impact of the equipment arrangement on the fluid flow path, pressure field, and resonant frequency. These results can help designers further optimize the configuration of the vibration damping equipment. After the preliminary design is completed, a genetic algorithm is used to optimize the final configuration of the vibration damping equipment. The genetic algorithm, by simulating a natural selection process, gradually optimizes the placement, angle, and number of vibration damping units to maximize the vibration damping 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 three-dimensional fluid dynamics simulation tools to simulate the vibration reduction effect of the vibration reduction equipment under the expected fluid dynamic conditions;

[0089] In this embodiment, based on the vibration damping equipment layout and configuration scheme determined in step two, a detailed performance evaluation is further conducted using a three-dimensional fluid dynamics simulation tool. First, a three-dimensional geometric model containing detailed structural features of the moon pool is constructed in the software. This model includes not only the basic structure of the moon pool but also detailed models of the vibration damping equipment, such as damping plates, dampers, and energy dissipation structures. It is ensured that the size, shape, and material properties of the vibration damping equipment model are consistent with the actual equipment.

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

[0091] In this embodiment, the simulation focuses on extracting and analyzing key simulation results, including changes in fluid velocity, pressure distribution, resonant frequency, and the evaluation of vibration reduction effect. Flow field diagrams and spectral analysis diagrams are generated based on these results to visually demonstrate the effectiveness of the vibration reduction equipment under different hydrodynamic conditions. If the simulation results indicate poor vibration reduction, minor adjustments to the layout or configuration of the vibration reduction equipment may be necessary to ensure optimal performance in the actual working environment. The adjusted scheme is then subjected to another hydrodynamic simulation to verify whether its effectiveness has improved.

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

[0093] In this embodiment, a physical model of the vibration damping device is constructed based on the aforementioned simulation verification results. The model is made of the same materials as those used in actual applications to ensure the device's durability and corrosion resistance in deep-sea environments. Each vibration damping unit is fabricated using precision machining equipment, such as CNC machine tools and 3D printers, ensuring its dimensions, shape, and internal structure are accurate. To verify the correctness of the material selection, preliminary pressure and corrosion resistance tests can be conducted in a laboratory environment.

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

[0095] Step 5: After installation, conduct a simulation test of the physical model. The test includes recording the performance of the vibration damping equipment under different working conditions, including its vibration damping effect under different sea states and moon pool load conditions.

[0096] In this embodiment, after installation, the first step is to prepare the test environment for the physical model. The test environment should be as close as possible to actual working conditions, including simulating different sea states such as calm seas, moderate and severe waves, and different moonpool load conditions. A suitable experimental site or simulation device should be selected to ensure the authenticity and reliability of the test.

[0097] Next, in this embodiment, sensor arrays are installed at key locations on the vibration damping device and the moon pool. These sensors are used to record the fluid flow path, pressure concentration areas, and changes in resonant frequency. The sensors should have high sensitivity and high accuracy to ensure that the recorded data is sufficiently accurate. After the test begins, different sea conditions are simulated by adjusting the fluid velocity, direction, and pressure, and the performance of the vibration damping device under each condition is recorded in real time. Subsequently, tests are conducted under different moon pool load conditions. By adjusting parameters such as the fluid volume and density in the moon pool, the state of the moon pool under different working loads is simulated, and the impact of the vibration damping device on fluid resonance is recorded.

[0098] In this embodiment, experimental data is collected and analyzed, including the response time of the vibration damping equipment, changes in resonant frequency, adjustments in pressure distribution, and changes in fluid velocity. This data will generate a detailed test report to evaluate the overall performance of the vibration damping equipment. If necessary, the equipment configuration will be further optimized or adjusted based on the test results to ensure its effectiveness under actual working conditions. The analysis of the experimental data should employ 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 data from the test is first analyzed to identify areas where the vibration reduction effect is unsatisfactory. Through in-depth analysis of these areas, the specific reasons for the poor vibration reduction effect are determined, such as improper location of vibration reduction equipment, insufficient quantity, or unreasonable angle setting.

[0101] Next, in this embodiment, based on the analysis results, the layout and configuration of the vibration damping equipment are adjusted. Specific adjustments may include: repositioning the vibration damping equipment to be closer to the critical area of ​​fluid resonance; adjusting the number and spacing of the damping units to enhance the overall vibration damping effect; and changing the material or shape of the vibration damping equipment to improve its adaptability to specific resonance modes. After the adjustments are completed, a three-dimensional fluid dynamics simulation of the new configuration is performed using CFD tools to verify whether the new configuration significantly improves the vibration damping effect.

[0102] In this embodiment, based on the adjusted simulation results, the equipment configuration is further fine-tuned until the vibration damping equipment can effectively reduce fluid resonance in the moon pool under all expected operating conditions. During the adjustment process, hydrodynamic 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 optimal results in the actual working environment.

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

[0104] In this embodiment, after a series of design, simulation, testing, and adjustments, the design and configuration scheme of the vibration damping device was finally determined. At this point, the scheme has been fully verified and optimized, and has good prospects for practical application. In particular, the configuration of the vibration damping device has achieved the effect of minimizing resonance phenomena, meeting the stringent requirements of the deep-sea environment.

[0105] Next, in this embodiment, the finalized vibration damping equipment configuration scheme is implemented in the actual deep-sea FPSO lunar pool. During implementation, the equipment installation and commissioning are carried out strictly in accordance with the design scheme to ensure that all vibration damping units are precisely arranged according to design requirements. After installation, a comprehensive commissioning and performance test of the entire system is conducted to ensure that the vibration damping equipment's performance in actual operation is consistent with the design expectations.

[0106] Through this series of implementation steps, a highly efficient and reliable fluid resonance reduction measure for deep-sea FPSOs in the lunar pool was finally completed, ensuring the stability and safety of the FPSO platform under harsh sea conditions. This solution is not only highly operable, but its implementation results have also been repeatedly verified, demonstrating a significant improvement in the platform's operational efficiency and safety level.

[0107] Example 1

[0108] An FPSO platform is deployed in a deep-sea environment at a depth of 1200 meters. The platform's moon pool is 20 meters long, 10 meters wide, and 15 meters deep. Due to the complex marine environment, significant fluid resonance is expected under wind speeds of 20-30 knots (10.3-15.4 m / s), leading to increased fluid amplitude within the moon pool and affecting the platform's stability and normal equipment operation.

[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 velocity range: 0.5-2 m / s

[0114] Seawater temperature: 5-10 degrees Celsius

[0115] 2. Moon Pool Structural Parameters:

[0116] Length: 20 meters

[0117] Width: 10 meters

[0118] Depth: 15 meters

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

[0120] 3. Vibration damping equipment parameters:

[0121] Box 1 dimensions: Length 2 meters, Width 1.5 meters, Height 1.5 meters

[0122] Side splitter 2 angle: 30 degrees

[0123] Width of flow channel 3: 0.3 meters

[0124] Slope of sloped return plate 7: 15 degrees

[0125] Curved reflux plate 6, radius of curvature: 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 fluids: 5000 cP centipoise

[0129] Implementation steps:

[0130] I. Assessment and Simulation:

[0131] The geometric parameters of the lunar pool were acquired using high-precision laser measurement equipment and input into three-dimensional fluid dynamics simulation software such as CFD. Boundary conditions were set, including flow velocity, wave height, and temperature in a marine environment. Through simulation, the resonant frequency range of the fluid within the lunar pool was determined to be 0.8 Hz to 1.2 Hz.

[0132] Based on the simulation results, the areas most prone to resonance within the lunar pool were identified, mainly concentrated in the center and both sides of the lunar pool.

[0133] II. Vibration Damper Design and Configuration:

[0134] Three vibration damping units were designed and installed, located at the two side edges and the central area within the moon pool. Each damping unit has a housing dimension of 2 meters long, 1.5 meters wide, and 1.5 meters high, filled with a non-Newtonian liquid with an initial viscosity of 5000 cP, capable of automatically adjusting the viscosity based on fluid impact.

[0135] The location, number, and angle of the vibration damping units were optimized using a genetic algorithm to minimize the resonant frequency and amplitude within the lunar pool. After optimization, the configuration of the vibration damping equipment within the lunar pool reduced the resonant frequency from 1.0 Hz to below 0.6 Hz.

[0136] III. Testing and Adjustment:

[0137] After installation, on-site simulation tests were conducted to test the performance of the vibration reduction equipment under different sea conditions, including wind speeds of 20-30 knots, wave heights of 3-6 meters, and current speeds of 0.5-2 meters per second.

[0138] The sensor array was used to monitor the amplitude and pressure changes of the fluid in the lunar pool in real time. Test results showed that the vibration damping device could reduce the amplitude of the fluid in the lunar pool by 60% and reduce the intensity of the resonance phenomenon to 30% of its original value.

[0139] IV. Effect Verification:

[0140] After numerous tests and adjustments, the vibration damping equipment performed stably under various operating conditions. Even in the most severe sea conditions with wind speeds of 30 knots, wave heights of 6 meters, and current speeds of 2 meters per second, the equipment was still able to effectively control resonance and ensure the stability of the FPSO platform.

[0141] Final data shows that by implementing this vibration reduction device, the fluid resonance phenomenon in the moon pool was significantly suppressed, the overall stability of the equipment and platform was greatly improved, and it is expected to extend the service life of the FPSO platform by more than 5 years and reduce maintenance costs by 50%.

[0142] This embodiment successfully reduced fluid resonance within the moonpool of a deep-sea FPSO by designing and implementing vibration damping equipment under specific sea conditions and moonpool structures. The specific numerical design and optimization of the equipment enabled it to adapt to different sea conditions and effectively reduce resonance phenomena. This solution not only improves the operational stability of the FPSO platform but also significantly reduces maintenance costs, demonstrating high practical application value.

[0143] Example 2

[0144] In a certain deep-sea area, significant tidal changes cause frequent and intense fluid oscillations within the moonpool of the FPSO platform, affecting platform stability and equipment operation. The objective of this embodiment is to effectively control tidal-induced fluid resonance through the design and installation of vibration damping devices, ensuring the safe and stable operation of the platform.

[0145] Numerical settings:

[0146] Tidal environmental parameters:

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

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

[0149] Tidal range: 2-4 meters

[0150] Fluid density variation range: 1020-1035 kg / m³. Seawater density is affected by temperature and salinity.

[0151] Moon pool structural parameters:

[0152] Length: 25 meters

[0153] Width: 12 meters

[0154] Depth: 18 meters

[0155] Edge shape: straight edges, with a bottom corner radius of 2.5 meters.

[0156] The parameters of the vibration damping equipment remain unchanged:

[0157] Box 1 dimensions: Length 2 meters, Width 1.5 meters, Height 1.5 meters

[0158] Side splitter 2 angle: 30 degrees

[0159] Width of flow channel 3: 0.3 meters

[0160] Slope of sloped return plate 7: 15 degrees

[0161] Curved reflux plate 6, radius of curvature: 2 meters

[0162] Slope board 4, length: 1.8 meters

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

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

[0165] Implementation steps:

[0166] I. Assessment and Simulation:

[0167] In this embodiment, the range of tidal velocity variation and the variation law of fluid density are first determined by calculating the tidal cycle. Combined with the geometric parameters of the lunar pool, the three-dimensional fluid dynamics simulation software CFD is used to simulate and calculate the resonant frequency of the lunar pool fluid under different velocity and density variations within the tidal cycle. The simulation results show that the resonant frequency within the lunar pool is mainly concentrated between 0.6Hz and 0.9Hz, and the resonance intensity increases with the increase of tidal range.

[0168] In this embodiment, the regions most prone to resonance within the lunar pool are identified based on simulation results. These regions are mainly located in the center and on both sides of the lunar pool.

[0169] II. Vibration Damper Design and Configuration:

[0170] In this embodiment, a vibration damping device designed with predetermined parameters includes a housing 1, a side diversion plate 2, a flow channel 3, a sloped return plate 7, an arc-shaped return plate 6, and a slope plate 4, which are installed in the center and on 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 hydrodynamic changes caused by tidal flow rate variations.

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

[0172] III. Testing and Adjustment:

[0173] In this embodiment, after the vibration damping equipment is installed, a field simulation test is conducted to simulate the fluid behavior in the moon pool under different tidal conditions. The test process involves real-time monitoring of fluid amplitude, resonant frequency changes, and the performance of the vibration damping equipment, with a focus on analyzing the vibration damping effect of the equipment under tidal ranges of 2 meters and 4 meters.

[0174] Test results show that under extreme conditions of a tidal range of 4 meters and a tidal velocity of 2.5 meters per second, vibration reduction equipment with predetermined 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] IV. Effect Verification:

[0176] In this embodiment, after multiple tests and adjustments, the final configuration of the vibration damping device was determined. The device performed stably under the most extreme tidal conditions, and the fluid resonance phenomenon within the moon pool was significantly suppressed. Data shows that the application of this vibration damping device significantly improved the stability of the FPSO platform, especially during periods of drastic tidal changes, reducing the platform's lateral and longitudinal displacements by more than 40%.

[0177] In this embodiment, the equipment has been optimized in design, resulting in good structural and material adaptability and enabling long-term stable operation. It is expected that the maintenance cycle of the FPSO platform will be extended by 3 years, reducing maintenance and operating costs.

[0178] This embodiment demonstrates the application scenario of a fluid resonance damping device for a deep-sea FPSO in a lunar pool using predetermined parameters under tidal conditions. Through detailed numerical settings and simulation verification, the device design effectively addresses the fluid resonance phenomenon caused by tides, improving the platform's operational stability. The device's predetermined parameters and optimized configuration enable it to perform excellently under various tidal conditions, significantly reducing platform maintenance costs and operational risks.

[0179] Example 3

[0180] In a certain deep-sea area, significant seasonal variations, especially the large differences in marine environment between winter and summer, lead to frequent and intense fluid oscillations within the moonpool of the FPSO platform, affecting the platform's stability and the normal operation of its equipment. The objective of this embodiment is to effectively control fluid resonance caused by seasonal variations through the design and installation of vibration damping devices, ensuring the platform's safe and stable operation throughout the year.

[0181] Numerical 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 velocity range: 1.5-3.0 m / s

[0187] Seawater 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 velocity range: 0.5-1.5 m / s

[0192] Seawater 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 edges, with a bottom corner radius of 2.2 meters.

[0198] The parameters of the vibration damping equipment remain unchanged:

[0199] Box 1 dimensions: Length 2 meters, Width 1.5 meters, Height 1.5 meters

[0200] Side splitter 2 angle: 30 degrees

[0201] Width of flow channel 3: 0.3 meters

[0202] Slope of sloped return plate 7: 15 degrees

[0203] Curved reflux plate 6, radius of curvature: 2 meters

[0204] Slope board 4, length: 1.8 meters

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

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

[0207] Implementation steps:

[0208] I. Assessment and Simulation:

[0209] In this embodiment, fluid dynamics simulations were conducted based on different environmental conditions in winter and summer. The winter simulation was set with wind speeds of 30-40 knots, wave heights of 5-8 meters, and flow velocities of 1.5-3.0 m / s; the summer simulation was set with wind speeds of 10-20 knots, wave heights of 1-3 meters, and flow velocities of 0.5-1.5 m / s. Combining the geometric parameters of the lunar pool, the resonant frequencies of the fluid within the lunar pool were calculated using the three-dimensional fluid dynamics simulation software CFD. The simulation results show that the resonant frequencies within the lunar pool are mainly concentrated between 0.7 Hz and 1.0 Hz in winter, while the resonant frequencies are lower in summer, mainly between 0.5 Hz and 0.8 Hz.

[0210] In this embodiment, the region within the lunar pool most prone to resonance was identified based on simulation results. The resonance regions differ between winter and summer. In winter, the resonance regions are mainly concentrated on both sides of the lunar pool, while in summer they are in the central region.

[0211] II. Vibration Damper Design and Configuration:

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

[0213] In this embodiment, the angle of the side diverter 2 and the curvature of the arc-shaped return plate 6 remain unchanged to ensure that the equipment can effectively reduce vibration under different fluid conditions in winter and summer. The equipment configuration is the same in winter and summer, but the focus of its action 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] III. Testing and Adjustment:

[0215] In this embodiment, after the vibration damping equipment was installed, on-site simulation tests were conducted in winter and summer. The test process involved real-time monitoring of fluid amplitude, resonant frequency changes, and the performance of the vibration damping equipment. The focus was on analyzing the equipment's vibration damping effect under extreme wind and wave conditions in winter (wind speed 40 knots, wave height 8 meters, flow velocity 3 meters / second) and under mild summer conditions (wind speed 10 knots, wave height 1 meter, flow velocity 0.5 meters / second).

[0216] Test results show that under extreme winter conditions, the vibration damping device can reduce the amplitude of fluid vibration in the moon pool by 65% ​​and reduce the intensity of resonance to 40% of the original. Under mild summer conditions, the vibration damping device also performs well, reducing the amplitude by 55% and the resonance intensity to 45% of the original.

[0217] IV. Effect Verification:

[0218] In this embodiment, after multiple tests and adjustments, the vibration damping device performed excellently under different environmental conditions in both winter and summer. The device can operate stably under extreme conditions in different seasons, effectively controlling fluid resonance within the moon pool. Data shows that the application of this vibration damping device significantly improves the year-round operational stability of the FPSO platform, especially under extreme sea conditions in winter, where the platform's lateral and longitudinal displacements are reduced by more than 50%, and by 35% in summer.

[0219] In this embodiment, the equipment did not experience significant wear or performance degradation during the year-round operation, which is expected to extend the maintenance cycle of the FPSO platform by 2-3 years, further reducing maintenance and operating costs.

[0220] This embodiment demonstrates the application scenario of a fluid resonance damping device in the lunar pool of a deep-sea FPSO using predetermined parameters under seasonally varying conditions. Through detailed numerical settings and simulation verification, the device can effectively cope with fluid resonance phenomena caused by seasonal changes, improving the platform's year-round operational stability. The numerical range and optimized configuration of the damping device enable it to perform excellently under different seasonal conditions, significantly reducing the platform's maintenance costs and operational risks.

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

[0222] Table 1: Experimental Data Table for Examples

[0223]

[0224]

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

[0226] Scene 1: Deep-sea environment

[0227] Environmental conditions: The scenario is set in a deep-sea environment with a current speed range of 1.0-2.0 m / 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 damping equipment performed exceptionally well under these conditions, reducing fluid amplitude within the moonpool by 60% and vibration intensity by 70%. With optimized configuration, the maintenance cycle of the FPSO platform is expected to be extended to 5 years. This demonstrates the equipment's excellent vibration damping effect and long-term effectiveness in harsh deep-sea environments.

[0229] Scenario 2: Tidal Environment

[0230] Environmental conditions: In a tidal environment, the current velocity ranges from 0.8 to 2.5 m / s, the wave height ranges from 2 to 4 meters, and the water temperature remains at 5 to 10℃.

[0231] Equipment performance: The vibration damping equipment also exhibits stability in tidal environments, with amplitude reduced by 60% and vibration intensity reduced by 65%. This effect demonstrates that the equipment can maintain effective vibration damping performance when dealing with fluid resonance caused by tides, and extends the maintenance cycle to 3 years, reflecting the reliability of the equipment in cyclically changing environments.

[0232] Scenario 3: Seasonal Environment

[0233] Environmental conditions: This scenario considers significant seasonal variations in winter and summer. In winter, the current velocity is 1.5-3.0 m / s, wave height is 5-8 meters, wind speed is 30-40 knots, and water temperature is low, at 2-5℃. Summer conditions are relatively mild, with a current velocity of 0.5-1.5 m / s, wave height of 1-3 meters, wind speed of 10-20 knots, and water temperature of 15-25℃.

[0234] Equipment performance: Under winter conditions, the vibration damping equipment performs excellently, reducing amplitude by 65% ​​and vibration intensity by 50%; under summer conditions, the equipment is equally effective, reducing amplitude by 55% and vibration intensity by 35%. 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] Experimental results across three scenarios demonstrate that the vibration damping device effectively reduces fluid resonance and improves the stability of the FPSO platform under various marine environmental conditions. The device's design performs exceptionally well in deep-sea, tidal, and seasonally varying environments, showcasing its broad applicability and durability. Furthermore, the extended maintenance cycle indicates reduced operating costs and improved overall platform economics. Overall, these experimental data support the application potential of the vibration damping device in diverse marine environments.

[0236] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vibration reduction method for a vibration reduction device for fluid resonance in the lunar pool of a deep-sea FPSO, characterized in that, Vibration reduction is achieved using a vibration reduction device based on fluid resonance within the lunar pool of a deep-sea FPSO. The vibration reduction device includes multiple vibration reduction units connected in sequence. The vibration damping unit includes a housing (1), with side diversion plates (2) fixedly connected to both sides of the housing (1), and multiple flow channels (3) opened on both sides of the housing (1), with sloped return plates (7) fixedly connected inside the flow channels (3). A cavity is formed between the flow channels (3) on both sides of the box body. An arc-shaped return plate (6) is provided on the upper end face of the cavity, and a slope plate (4) is provided on its lower end face. A fixing chain (5) is fixedly connected to the lower surface of the slope plate (4) for fixing it in the moon pool; the method includes the following steps: Step 1: Evaluate the geometry and hydrodynamic characteristics of the lunar pool of the deep-sea FPSO. Using three-dimensional hydrodynamic simulation technology, calculate the resonant frequency of the fluid in the lunar pool based on the geometry and hydrodynamic characteristics, and form a hydrodynamic data sample. Step 2: Based on the fluid dynamics data samples obtained from the evaluation, determine the initial number and layout of the vibration damping equipment, adjust the angle of the vibration damping equipment to adapt to the fluid flow direction and turbulent region, and further optimize the layout and configuration scheme of the vibration damping equipment using computer optimization algorithms; the layout and configuration scheme includes the position, number, and placement angle of the vibration damping equipment. The design of the layout and configuration scheme for vibration damping equipment includes the following steps: Based on fluid dynamics data samples, key regions where resonance phenomena exist within the moon pool were identified. These key regions are locations where the fluid resonance frequency is greater than a set resonance frequency threshold or the fluid pressure gradient is greater than a set fluid pressure gradient. The quantity and layout of vibration reduction equipment were initially determined, and the vibration reduction effect was initially evaluated through CFD simulation. Adjust the angle of the vibration damping equipment to adapt to the direction of fluid flow and the turbulent region; The layout and configuration scheme were optimized, and computer optimization algorithms were used to further optimize the final position, quantity and angle of the vibration damping equipment. Step 3: Simulate the vibration reduction effect of the vibration damping equipment under the expected hydrodynamic conditions using a three-dimensional fluid dynamics simulation tool. This simulation includes the following steps: Based on the designed layout and configuration scheme of the vibration reduction equipment, a three-dimensional geometric model of the moon pool is established. The three-dimensional geometric model of the moon pool includes the geometric parameters of the moon pool, the shape of the pool wall, the edge characteristics and the internal components. Add a vibration damping device model to the three-dimensional geometric model; Set the boundary and initial conditions for the fluid dynamics simulation, including the initial velocity, pressure, and flow direction parameters of the fluid in the moon pool; Numerical simulations were performed using three-dimensional fluid dynamics simulation tools to analyze the flow behavior of fluid in the moon pool and its interaction with vibration damping equipment, and to calculate the impact of vibration damping equipment on resonant frequency and fluid pressure field. Extract and analyze simulation results, including changes in fluid velocity, pressure distribution, resonant frequency, and vibration reduction effect, and generate corresponding flow field diagrams and spectrum analysis diagrams; Based on the simulation results, the layout or configuration of the vibration reduction equipment should be adjusted. Step 4: Based on the simulation results, construct a physical model of the vibration reduction equipment and install it in the simulated or actual deep-sea FPSO lunar pool environment. Step 5: After installation, conduct a simulation test of the physical model. The test includes recording the performance of the vibration reduction equipment under different working conditions, including its vibration reduction effect under different sea states 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 scheme of the vibration reduction equipment and implement it in the actual deep-sea FPSO lunar pool.

2. The vibration reduction method for a vibration reduction device for fluid resonance in the lunar pool of a deep-sea FPSO according to claim 1, characterized in that, The side flow divider (2) has beveled angles on both the top and bottom sides on the side away from the cavity.

3. The vibration reduction method for a vibration reduction device for fluid resonance in the lunar pool of a deep-sea FPSO according to claim 1, characterized in that, Non-Newtonian liquid is provided inside both the slope plate (4) and the slope-shaped reflux plate (7).

4. The vibration reduction method for the vibration reduction equipment of the deep-sea FPSO lunar pool fluid resonance according to claim 1, characterized in that, The geometry of the deep-sea FPSO lunar pool includes the size and shape of the pool, and the hydrodynamic characteristics include the flow velocity and direction of the fluid over a set period of time. The evaluation of the geometry and hydrodynamic characteristics of the lunar pool of a deep-sea FPSO includes the following steps: Obtain the 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 lunar pool, including the fluid velocity, flow direction and temperature distribution over different time periods; The geometric parameters and fluid dynamic characteristics of the lunar pool are input into a three-dimensional fluid dynamics simulation software to construct a three-dimensional dynamic model of the fluid in the lunar pool, and boundary conditions and initial conditions are set. Three-dimensional fluid dynamics simulations were performed, and the resonant frequencies and resonant modes of the fluid in the lunar pool were calculated based on the simulation results, generating the corresponding spectral analysis diagrams.

5. The vibration reduction method for the vibration reduction equipment of the deep-sea FPSO lunar pool fluid resonance according to claim 1, characterized in that, The simulation test of the physical model after installation includes the following steps: Prepare a test environment for the physical model and select an experimental site or simulation device that matches the actual sea conditions and lunar pool load conditions. Install sensor arrays at key locations in vibration damping equipment and moon pools, including fluid flow paths, pressure concentration areas, and key areas where resonance occurs. Preliminary tests were conducted to simulate different sea conditions by adjusting the fluid velocity, direction, and pressure, and to record the performance of the vibration reduction equipment under various conditions. Experiments were conducted under different moon pool load conditions. By adjusting the fluid volume and density in the moon pool, the state of the moon pool under different working loads was simulated, and the influence of the vibration damping equipment on fluid resonance was recorded. Collect and analyze test data, including the response time of vibration damping 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 damping equipment, verify its effectiveness under various working conditions, and determine whether further optimization or adjustment of the equipment configuration is needed.

6. The vibration reduction method for a vibration reduction device for fluid resonance in the lunar pool of a deep-sea FPSO according to claim 1, characterized in that, Adjusting and optimizing the configuration of vibration reduction equipment based on simulation test results includes the following steps: Analyze the data from the simulation test to identify areas where the vibration reduction effect is not ideal under specific working conditions; Based on the analysis results, the layout and configuration of the vibration damping equipment were adjusted, including reconfiguring the location, quantity, and angle of the vibration damping equipment; Assess the interaction between damping units and adjust the spacing between them as needed; Optimize the configuration by increasing or decreasing the number of vibration damping units; The adjusted configuration was simulated again using three-dimensional fluid dynamics to verify whether the adjusted configuration significantly improved the vibration reduction effect. Based on the adjusted simulation results, the equipment configuration was further fine-tuned until the vibration damping equipment could effectively reduce fluid resonance in the moon pool under all expected operating conditions.

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