Design method and device of flexible pipe of ship sea communication system and electronic equipment

Abstract

This invention provides a design method, apparatus, and electronic equipment for flexible nozzles in ship navigation systems. It performs continuous multi-condition simulations of the ship navigation system model throughout its entire lifecycle, inheriting and transferring physical quantity calculation results between conditions. Three-dimensional displacement field data at the weld between the rigid navigation pipe and the hull shell are extracted under each condition to generate a three-dimensional displacement envelope curve for the entire lifecycle. This envelope curve is used as the boundary condition for flexible nozzle design. With maximizing the basic safety margin throughout the entire lifecycle as the optimization objective, design variables, including nozzle selection parameters, are iteratively optimized to obtain the optimal flexible nozzle design scheme. This eliminates the risk of pipe breakage caused by complex deformations of the hull under different service conditions, achieving a reasonable and scientific design of flexible nozzle selection parameters, and greatly improving the overall operational safety and design scientificity of the ship navigation system.

Description

Technical Field

[0001] This invention relates to the field of ship design and construction technology, and in particular to a design method, device and electronic equipment for a flexible nozzle of a ship's sea passage system. Background Technology

[0002] With the development of larger and more modular shipbuilding, the piping of ship navigation systems is typically installed as the final component after the various compartments are assembled, connecting prefabricated modules to the hull's sea openings. During actual ship operation, the hull deforms to varying degrees due to the alternating effects of changes in draft and ocean wave loads. To prevent the welded joints between the internal navigation pipes and the hull from breaking due to this deformation, flexible nozzles must be installed on the rigid navigation pipes to effectively compensate for the displacement of the hull structure. Therefore, accurately and scientifically designing the displacement compensation parameters of the flexible nozzles is a core technical requirement for ensuring the safe operation of the navigation system throughout the ship's entire lifecycle. To meet these requirements, current technologies primarily rely on historical experience assessments or finite element simulations for specific conditions for the design and selection of flexible nozzles.

[0003] However, existing assessments are mostly limited to a single static operating condition, which causes the simulation to deviate from the actual service state. Furthermore, they cannot cover the extreme values ​​of three-dimensional displacement faced by pipeline endpoints in complex environments, making it difficult for the determined nozzle selection parameters to maintain a long-term safe operating range, which can easily lead to insufficient stiffness or excessive fracture risk. Summary of the Invention

[0004] This invention provides a design method, device, and electronic equipment for a flexible nozzle in a ship's sea passage system, which solves the problem that the design of flexible nozzles in the prior art is limited to a single working condition, resulting in unreasonable displacement compensation indicators.

[0005] This invention provides a design method for a flexible nozzle in a ship's sea passage system, comprising: The simulation model of the ship's sea passage system is continuously simulated under multiple operating conditions according to the entire life cycle, and the calculation results of physical quantities are inherited and transferred between the simulation models under different operating conditions; the ship's sea passage system includes the hull shell, rigid sea passage pipes and flexible nozzles. Extract the three-dimensional displacement field data of the weld between the rigid sea passage pipeline and the hull shell under each working condition, and generate the three-dimensional displacement envelope curve for the entire life cycle; The three-dimensional displacement envelope curve is used as the boundary condition for the flexible nozzle design. The optimization objective is to maximize the basic safety margin of the flexible nozzle throughout its entire life cycle. The design variables that satisfy the boundary condition are iteratively optimized to obtain the optimal flexible nozzle design scheme. The design variables include the nozzle selection parameters for the flexible nozzle.

[0006] According to the design method of the flexible nozzle of the ship's sea passage system provided by the present invention, the design variables further include the support layout parameters of the rigid sea passage pipe; The optimization objective is to maximize the basic safety margin of the flexible nozzle throughout its entire life cycle. Iterative optimization is performed on the design variables that satisfy the boundary conditions to obtain the optimal flexible nozzle design scheme, including: In each iteration of the simulation, the actual deformation of the flexible nozzle corresponding to the current design variable under each working condition is extracted. Calculate the single-condition safety margin between the actual deformation under each working condition and the allowable compensation corresponding to the flexible nozzle; The basic safety margin is obtained based on the minimum value among the single-condition safety margins under all operating conditions; The selection parameters of the nozzle and the support layout parameters of the rigid sea-crossing pipeline that satisfy the boundary conditions are iterated synchronously. Based on the selection parameters of the nozzle and the support layout parameters that maximize the foundation safety margin, the optimal flexible nozzle design scheme is obtained.

[0007] According to the present invention, a design method for a flexible nozzle of a ship's sea passage system is provided, wherein the multiple operating conditions under the whole life cycle include the slipway closing condition, launching condition, full draft condition and extreme sea state condition. The continuous multi-condition simulation of the simulation model according to the entire life cycle includes: Under the aforementioned slipway closure condition, the self-weight load of each compartment is applied. Under the aforementioned drainage conditions, hydrostatic pressure and external load are applied; Under the full draft condition, hydrostatic pressures corresponding to multiple different draft depths are applied respectively; Under the aforementioned extreme sea conditions, wave loads and impact loads are applied.

[0008] According to the design method of a flexible nozzle for a ship's sea passage system provided by the present invention, the inheritance and transfer of physical quantity calculation results of the simulation model between various operating conditions includes: Extract the calculation results of the previous physical quantity after the simulation of the previous working condition is completed on the simulation model; the calculation results of the previous physical quantity include the previous deformation and the previous stress. The calculation result of the previous physical quantity is used as the initial condition for the simulation calculation of the next adjacent working condition. The simulation model is then used to simulate the next adjacent working condition until the simulation of the last working condition in the entire life cycle is completed.

[0009] According to the present invention, a design method for a flexible nozzle of a ship's sea passage system is provided, wherein the nozzle selection parameters include nominal values ​​of axial compensation, radial compensation, and angular compensation. The step of extracting the three-dimensional displacement field data of the weld between the rigid sea passage pipeline and the ship's outer shell under each working condition, and generating the three-dimensional displacement envelope curve for the entire life cycle, includes: Extract the axial displacement component, radial displacement component, and angular deflection component of the weld joint under each working condition; The axial displacement component, radial displacement component, and angular deflection component under each working condition are combined in chronological order to generate the three-dimensional displacement envelope curve.

[0010] According to the present invention, a design method for a flexible nozzle of a ship's sea passage system is provided, wherein the simulation model includes a finite element model of the ship's hull, a finite element model of the rigid sea passage pipe, and an initial parametric model of the flexible nozzle. The steps for constructing the simulation model include: By assigning elastic material properties to the hull shell and the rigid sea passage pipe, a finite element model of the hull and a finite element model of the pipe are constructed. The flexible nozzle is given hyperelastic material properties and a nonlinear stiffness characteristic curve is set to construct the initial parametric model of the flexible nozzle; A rigid coupling connection is established at the welded joint between the rigid sea passage pipe and the hull shell, and a hinged or elastic connection is established at the joint between the flexible nozzle and the rigid sea passage pipe.

[0011] The present invention also provides a design device for a flexible nozzle of a ship's sea passage system, comprising: The simulation unit performs continuous multi-condition simulations of the simulation model of the ship's sea passage system according to the entire life cycle, and inherits and transfers the physical quantity calculation results of the simulation model between each condition; the ship's sea passage system includes the hull shell, rigid sea passage pipes and flexible nozzles. The envelope curve generation unit extracts the three-dimensional displacement field data of the weld between the rigid sea passage pipeline and the hull shell under each working condition, and generates the three-dimensional displacement envelope curve for the entire life cycle. The optimization unit uses the three-dimensional displacement envelope curve as the boundary condition for the flexible nozzle design. With the goal of maximizing the basic safety margin of the flexible nozzle throughout its entire life cycle, it iteratively optimizes the design variables that satisfy the boundary condition to obtain the optimal flexible nozzle design scheme. The design variables include the nozzle selection parameters for the flexible nozzle.

[0012] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the design method of flexible nozzle for a ship navigation system as described above.

[0013] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the design method for flexible nozzles of a ship's sea passage system as described above.

[0014] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the design method for flexible nozzles of a ship navigation system as described above.

[0015] The present invention provides a design method, device, and electronic equipment for flexible nozzles in ship navigation systems. It performs continuous multi-condition simulations of the ship navigation system simulation model throughout its entire lifecycle, inheriting and transferring physical quantity calculation results between conditions. It extracts three-dimensional displacement field data at the weld between the rigid navigation pipe and the hull shell under each condition, generating a three-dimensional displacement envelope curve for the entire lifecycle. This envelope curve is used as the boundary condition for flexible nozzle design. With maximizing the basic safety margin throughout the entire lifecycle as the optimization objective, it iteratively optimizes design variables, including nozzle selection parameters, to obtain the optimal flexible nozzle design scheme. This eliminates the risk of pipe breakage caused by complex deformation of the hull under different service conditions from the source, achieving a reasonable and scientific design of flexible nozzle selection parameters, and greatly improving the overall operational safety and design scientificity of the ship navigation system. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a flowchart illustrating the design method for the flexible nozzle of a ship's sea passage system provided by the present invention; Figure 2 This is a schematic diagram of the ship navigation system provided by the present invention; Figure 3 This is a schematic diagram of the design device for the flexible nozzle of the ship's sea passage system provided by the present invention; Figure 4 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0018] 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.

[0019] It should be understood that, in the description of the embodiments of the present invention, "multiple" means two or more, unless otherwise explicitly specified. Furthermore, all actions involving the acquisition of signals, information, or data in this application are performed in accordance with the applicable data protection laws and regulations of the locality and with permission granted by the owner of the respective device.

[0020] The current design of flexible nozzles for marine vessels suffers from the following prominent problems: First, it relies heavily on historical experience and lacks scientific design methods. Currently, flexible nozzle designs generally determine displacement compensation indices based on historical experience, making it difficult to design flexible nozzles with appropriately suitable displacement compensation indices. If the displacement compensation index of the flexible nozzle is too large, the cost is higher and the stiffness is lower, resulting in insufficient load-bearing capacity; if the displacement compensation index is too small, axial or radial deviations may occur during operation, leading to a risk of breakage.

[0021] Secondly, the design boundary is singular and does not cover the entire life cycle. Existing technologies propose constructing a static model of the hull using finite element analysis software to simulate hull deformation at different drafts, obtaining different expected displacement compensation amounts for the flexible nozzle, and thus determining the optimal compensation index. However, this method only analyzes based on the slipway or a single operating condition, limiting the design boundary to a "single draft condition," and failing to cover the entire operating condition chain from slipway assembly to launching, and then to service across the full draft range and extreme sea states. After the ship is launched, the hull undergoes more complex coupled deformations, leading to a significant deviation between the design compensation index of the flexible nozzle on the slipway and the actual requirements after launching.

[0022] To address the problem that existing flexible nozzle designs are limited to a single operating condition, resulting in unreasonable displacement compensation indicators, this invention provides a design method for flexible nozzles in ship navigation systems, enabling comprehensive and scientific flexible nozzle design. Figure 1 This is a flowchart illustrating the design method for the flexible nozzle of a ship's sea passage system provided by the present invention, as shown below. Figure 1 As shown, the method includes: Step 110: Perform continuous multi-condition simulations on the simulation model of the ship's sea passage system according to the entire life cycle, and inherit and transfer the physical quantity calculation results of the simulation model between each condition.

[0023] Here, the entire life cycle refers to the entire time span from the initial construction stage of a ship to its launch and service at sea, encompassing the various stress and deformation states the ship experiences during its life cycle. The simulation model of a ship's sea passage system refers to a digital computational model that accurately reflects the mechanical coupling relationships and engineering deviation transmission laws between the various components of the system, typically constructed based on Finite Element Analysis (FEA) technology.

[0024] Here, the ship's sea passage system includes the hull, rigid sea passage pipes, and flexible nozzles. The hull refers to the outermost shell structure of the ship, which deforms under different water pressures and loads, serving as a crucial support and constraint boundary for the sea passage system. Rigid sea passage pipes refer to the metal or rigid material piping system inside the ship used for introducing or discharging seawater; their deformation capacity is minimal. Flexible nozzles are flexible connecting elements installed between the rigid sea passage pipes and the hull, or between rigid sea passage pipes themselves, used to absorb and compensate for displacement deviations caused by hull deformation, preventing the piping system from breaking or failing.

[0025] In one embodiment, Figure 2 This is a structural schematic diagram of the ship navigation system provided by the present invention, as shown below. Figure 2 As shown, the ship's sea passage system mainly includes the hull shell, prefabricated modules, and a piping system connecting the prefabricated modules to the sea passage openings on the hull shell. The piping system, as the final crucial element in modular ship construction, is typically installed after the ship's various sections are assembled. The piping system features a typical rigid-flexible coupling structure, primarily composed of rigid sea passage pipes and flexible connecting pipes connected in series. The rigid sea passage pipes are fixedly supported within the hull by a bracket structure. Because the hull shell deforms to varying degrees when the ship navigates at different drafts and in complex sea conditions, flexible connecting pipes are specifically installed on the rigid sea passage pipes to compensate for the displacement caused by the hull shell's deformation using the flexible deformation capability of the connecting pipes. This rigid-flexible coupling structural layout effectively absorbs and buffers displacement deviations caused by hull deformation, thereby preventing breakage at the welds between the rigid sea passage pipes and the hull shell due to excessive stress or exceeding tolerances, ensuring the safety and reliability of the ship's sea passage system throughout its entire life cycle.

[0026] Specifically, firstly, a geometric model including the ship's hull, rigid sea passage pipes, and initially selected flexible nozzles is obtained, and these are assigned corresponding elastic or hyperelastic material properties to construct a simulation model of the ship's sea passage system. Then, simulation calculations are performed sequentially for multiple preset operating conditions according to the time progression of the entire life cycle. During this process, the simulation model inherits and transfers the calculation results of physical quantities between each operating condition; that is, the deformation and stress results obtained from the previous operating condition calculation are directly used as the initial base state for the simulation calculation of the next adjacent operating condition, ensuring the physical realism of the operating condition evolution.

[0027] It should be noted that by conducting continuous multi-condition simulations throughout the entire life cycle and inheriting and transferring the calculation results of physical quantities between conditions, it is possible to accurately simulate the complex mechanical coupling deformation law of the ship's sea passage system throughout its entire life cycle. This overcomes the shortcomings of existing technologies that rely solely on isolated analysis of a single slipway condition, resulting in simulation results that deviate significantly from the actual service state.

[0028] Step 120: Extract the three-dimensional displacement field data of the weld between the rigid sea passage pipeline and the ship's outer shell under each working condition, and generate the three-dimensional displacement envelope curve for the entire life cycle.

[0029] Here, three-dimensional displacement field data refers to the displacement changes of the target position in various spatial degrees of freedom in a three-dimensional spatial coordinate system. This can include data combinations of multiple components such as axial displacement, radial displacement, and angular deflection. The three-dimensional displacement envelope curve refers to a spatial boundary curve formed by concatenating and superimposing the three-dimensional displacement field data extracted from various independent operating conditions throughout the entire lifespan, in chronological order, and with spatial extrema. This curve covers all possible displacement extrema ranges of the target position throughout its entire lifespan.

[0030] Specifically, after completing continuous multi-condition simulations, the simulation results are post-processed. That is, the three-dimensional displacement field data of the weld between the rigid sea passage pipeline and the ship's outer shell are extracted under each specific simulated condition. Then, the extracted three-dimensional displacement field data under all conditions are aggregated and arranged in time sequence to generate a three-dimensional displacement envelope curve characterizing the entire life cycle of the weld.

[0031] It should be noted that extracting the three-dimensional displacement field data of the weld under various working conditions and generating the three-dimensional displacement envelope curve can accurately quantify the actual displacement compensation requirements of the rigid-flexible coupling structure of the Tonghai system under various extreme and conventional working conditions. This provides a comprehensive and scientific data input boundary for the precise design of the flexible nozzle, avoiding the blindness caused by human experience estimation.

[0032] Step 130: The three-dimensional displacement envelope curve is used as the boundary condition for the flexible nozzle design. The optimization objective is to maximize the basic safety margin of the flexible nozzle throughout its entire life cycle. The design variables that satisfy the boundary condition are iteratively optimized to obtain the optimal flexible nozzle design scheme.

[0033] Here, boundary conditions refer to the limitations on the foundation deformation range that the compensation capacity must cover and satisfy during the selection and design optimization of flexible nozzles. Foundation safety margin refers to the safety difference or ratio between the allowable compensation provided by the flexible nozzle under various working conditions and the actual deformation it must withstand; a larger value indicates safer nozzle operation. Design variables refer to a set of parameters that can be dynamically adjusted during the design optimization calculation process. These design variables include the nozzle selection parameters. The nozzle selection parameters are the core geometric or performance parameters that determine the physical compensation specifications and initial installation state of the flexible nozzle itself, such as the nominal values ​​of axial compensation, radial compensation, and installation pre-offset.

[0034] Specifically, firstly, the generated three-dimensional displacement envelope curve is set as a boundary condition that the design model must satisfy to ensure that the selected nozzle can handle any displacement within the envelope curve range. Next, design variables participating in the optimization are defined, including at least the nozzle selection parameters for the flexible nozzle. Then, an evaluation function is established with the optimization objective of maximizing the basic safety margin of the flexible nozzle throughout its entire life cycle. An iterative optimization algorithm is used to repeatedly combine and calculate within the value space of the design variables. Each iteration checks whether the current design variables satisfy the boundary conditions and calculates their corresponding basic safety margin.

[0035] Finally, through algorithmic convergence and optimization, the combination of design variables that maximizes the basic safety margin is obtained, which is the optimal flexible nozzle design scheme. Here, the optimal flexible nozzle design scheme refers to the set of design parameters that, under the premise of satisfying all constraints, achieves the global maximum value of the optimization objective function.

[0036] It should be noted that by iteratively optimizing the design variables, including the nozzle selection parameters, with the goal of maximizing the basic safety margin, the global optimal solution for the nozzle specifications can be obtained scientifically and automatically. This avoids insufficient stiffness and cost waste caused by excessively large compensation indicators, and also avoids the risk of excessive fracture caused by excessively small compensation indicators.

[0037] The method provided in this invention performs continuous multi-condition simulations on a ship's sea passage system simulation model throughout its entire life cycle, inheriting and transferring physical quantity calculation results between conditions. It extracts three-dimensional displacement field data at the weld between the rigid sea passage pipe and the ship's outer shell under each condition, generating a three-dimensional displacement envelope curve for the entire life cycle. This envelope curve is used as the boundary condition for flexible nozzle design. With maximizing the basic safety margin throughout the entire life cycle as the optimization objective, iterative optimization is performed on design variables, including nozzle selection parameters, to obtain the optimal flexible nozzle design scheme. This eliminates the risk of pipe breakage caused by complex deformation of the hull under different service conditions from the source, achieving a reasonable and scientific design of flexible nozzle selection parameters, and greatly improving the overall operational safety and design scientificity of the ship's sea passage system.

[0038] Based on any of the above embodiments, in order to achieve coordinated optimization of the flexible nozzle selection and the pipeline support structure, the design variables also include the support layout parameters of the rigid sea-crossing pipeline. Here, the support layout parameters refer to the three-dimensional spatial coordinates of the supports used to support and fix the rigid sea-crossing pipeline within the hull.

[0039] In step 130, with the optimization objective of maximizing the basic safety margin of the flexible nozzle throughout its entire life cycle, the design variables satisfying the boundary conditions are iteratively optimized to obtain the optimal flexible nozzle design scheme, including: In each iteration of the simulation, the actual deformation of the flexible nozzle corresponding to the current design variable under each working condition is extracted. Here, the actual deformation refers to the displacement deformation value of the flexible nozzle in the simulation model under specific loads and boundary constraints.

[0040] Specifically, after starting the iterative optimization algorithm, for each selected combination of design variables, including nozzle selection parameters and support layout parameters, a rigid-flexible coupling finite element simulation is run, and the actual deformation of the flexible nozzle under each preset working condition is extracted from the simulation results.

[0041] Then, the single-condition safety margin between the actual deformation under each working condition and the allowable compensation corresponding to the flexible nozzle is calculated. Here, the allowable compensation refers to the maximum permissible displacement compensation value that the flexible nozzle can safely withstand based on its material and structural design. Here, the single-condition safety margin refers to the safety difference or proportion between the allowable compensation of the flexible nozzle and its actual deformation under a specific single working condition.

[0042] Specifically, the single-condition safety margin, used to measure the deformation safety of the flexible nozzle under a single working condition, is calculated by subtracting or dividing the allowable compensation of the flexible nozzle by the actual deformation under the corresponding working condition. It should be noted that calculating the single-condition safety margin can accurately assess the safety redundancy level of the flexible nozzle under each independent stress state, preventing local failure under a specific working condition.

[0043] Furthermore, the basic safety margin is obtained based on the minimum value among the single-condition safety margins under all operating conditions.

[0044] Specifically, the safety margins of all single-conditions calculated under various operating conditions throughout the entire life cycle are compared, and the single-condition safety margin with the smallest value is selected and used as the basic safety margin for the entire life cycle assessment.

[0045] It should be noted that in this step, the minimum value among all single-condition safety margins is taken as the basic safety margin, which follows the principle of the weakest link effect and ensures that the assessed basic safety margin can truly reflect the most dangerous and extreme safety conditions of the flexible docking station throughout its entire life cycle.

[0046] Next, the nozzle selection parameters and the support layout parameters of the rigid sea-crossing pipeline that satisfy the boundary conditions are iterated synchronously. Based on the nozzle selection parameters and support layout parameters that maximize the basic safety margin, the optimal flexible nozzle design scheme is obtained.

[0047] Here, synchronous iteration refers to the process of treating the pipe selection parameters and support layout parameters as a unified solution set, and simultaneously changing their values ​​in the optimization algorithm to perform coupled optimization.

[0048] Specifically, during synchronous iteration, the selection of design variables must satisfy comprehensive boundary conditions. On the one hand, it is necessary to ensure that the actual deformation under each working condition is always less than the allowable compensation; on the other hand, the support layout parameters of the rigid sea-crossing pipeline also have corresponding boundary conditions in the iterative optimization. Here, the boundary conditions for the support layout can be a feasible region of installation position pre-set based on the actual space constraints inside the ship's compartments, or a reasonable layout range determined based on the mechanical constraints such as local stress of the support or deformation due to pipeline self-weight obtained from the initial simulation.

[0049] Under the premise of satisfying the above-mentioned nozzle deformation boundary conditions and support layout boundary conditions, the nozzle selection parameters and support layout parameters are synchronously iteratively calculated according to the arithmetic and geometric parameter selection algorithms. After multiple iterations of simulation, by comparing the basic safety margin obtained in each iteration, the nozzle selection parameters and support layout parameters corresponding to the iteration that makes the basic safety margin reach the global maximum value are extracted as the final output optimal flexible nozzle design scheme.

[0050] The method provided in this invention extracts the actual deformation amount and calculates the single-condition safety margin in each iteration, and then obtains the basic safety margin based on the minimum single-condition safety margin. Finally, it iterates synchronously on the nozzle selection parameters and support layout parameters that meet the boundary conditions including nozzle deformation restrictions and support installation position restrictions to obtain the optimal solution corresponding to the maximum basic safety margin. This effectively solves the problem of the separation between rigid pipeline design and flexible nozzle selection in the prior art, and realizes the multi-parameter collaborative optimal design of flexible nozzle selection and support layout in a typical rigid-flexible coupling structure under the premise of considering actual physical installation constraints, which greatly improves the overall mechanical coordination and reliability of the sea passage system.

[0051] Based on any of the above embodiments, in order to make the simulation design cover the entire service life of the ship, the multiple operating conditions under the whole life cycle include the slipway assembly condition, launching condition, full draft condition and extreme sea state condition.

[0052] In step 110, continuous multi-condition simulations are performed on the simulation model according to the entire life cycle, including: Under the aforementioned slipway closure condition, the self-weight load of each compartment is applied. Under the aforementioned drainage conditions, hydrostatic pressure and external load are applied; Under the full draft condition, hydrostatic pressures corresponding to multiple different draft depths are applied respectively; Under the aforementioned extreme sea conditions, wave loads and impact loads are applied.

[0053] Specifically, a time-sequential sequence of working conditions is defined. First, in the first stage of the slipway assembly condition, the self-weight load of each section is applied to the simulation model to calculate the deformation at the welds caused by initial assembly deviations. Here, the slipway assembly condition refers to the initial construction state after the assembly and welding of each section on the slipway. Furthermore, the self-weight load of the section refers to the gravity acting on each structural module of the ship.

[0054] Next, under the second stage of the launching condition, the hydrostatic pressure and external loads after the ship is launched are applied, and the additional deformation of the hull caused by the launching process are calculated. Here, the launching condition refers to the ship's initial floating state in still water after being launched from the slipway. In addition, external loads refer to other environmental forces besides hydrostatic pressure during the launching process.

[0055] Then, in the third stage under full draft conditions, corresponding hydrostatic pressure distributions are applied for multiple draft depths from unloaded to fully loaded, i.e., the uneven pressure exerted by the water on the hull at different draft depths is applied. The progressive deformation of the hull at each draft is then calculated. Here, full draft conditions refer to the service status of the ship at multiple conventional draft depths during the process from unloaded to fully loaded.

[0056] Finally, in the fourth stage of extreme sea state conditions, wave loads and impact loads are applied, and the ultimate deformation of the hull under these extreme conditions is calculated. Here, extreme sea state conditions refer to the service condition of a ship subjected to extreme loads such as giant waves in a harsh marine environment. Furthermore, the wave loads and impact loads here refer to the dynamic and intense forces generated by waves crashing against the hull under high sea states.

[0057] The method provided in this invention continuously simulates the application of corresponding self-weight, hydrostatic pressure, external loads and wave impact loads under multiple working conditions such as ship docking, launching, full draft and extreme sea states. This expands the design boundary from a single draft working condition to a full life cycle working condition chain, so that the design of the flexible nozzle not only meets the static conditions of the ship dock, but also adapts to the complex dynamic coupling deformation requirements after launching and under extreme service conditions.

[0058] Based on any of the above embodiments, in order to ensure the continuity and physical realism of multi-condition simulation, step 110 includes inheriting and transferring the physical quantity calculation results of the simulation model between different conditions, including: Extract the calculation results of the previous physical quantity after the simulation of the previous working condition is completed for the simulation model; the calculation results of the previous physical quantity include the previous deformation and the previous stress.

[0059] The calculation result of the previous physical quantity is used as the initial condition for the simulation calculation of the next adjacent working condition. The simulation model is then used to simulate the next adjacent working condition until the simulation of the last working condition in the entire life cycle is completed.

[0060] Here, the previous physical quantity calculation result refers to the mechanical state data retained on the nodes and elements of the simulation model when the simulation condition calculation at an earlier stage in the time series is completed. The previous deformation and previous stress results refer to the deformation size and internal stress distribution of the model at the end of the preceding condition, respectively. Additionally, the initial conditions refer to the basic starting state when starting the next numerical simulation calculation.

[0061] Specifically, during the time-series progressive simulation process, after the simulation calculation of the previous condition, such as the shipyard closure condition, is completed, the calculation results of the previous physical quantities, including the previous deformation and stress results, are extracted from the simulation model through the simulation software's data interface or restart function. Subsequently, these extracted mechanical state data are used as the initial conditions and seamlessly imported into the simulation loading of the next adjacent condition, such as the launching condition. This inheritance and transfer process is repeated until the simulation of the last condition in the entire life cycle, such as the extreme sea state condition, is completed.

[0062] The method provided in this invention extracts the deformation and stress results from the simulation of the previous working condition and uses them as the initial conditions for the simulation of the next adjacent working condition, and then proceeds sequentially until the last working condition. This establishes and realizes a mechanism for the inheritance and transfer of physical quantities between working conditions in the time series, ensuring the continuity, realism, and accuracy of engineering deviation transfer in the simulation of the rigid-flexible coupling model throughout the entire life cycle.

[0063] Based on any of the above embodiments, in order to achieve accurate design for multi-dimensional compensation parameters, the pipe selection parameters include nominal values ​​for axial compensation, radial compensation, and angular compensation.

[0064] Here, the nominal values ​​of axial compensation, radial compensation, and angular compensation refer to the rated displacement compensation values ​​that the flexible nozzle can tolerate when it deflects along the central axis of the pipeline, perpendicular to the central axis of the pipeline, and deviates from the central axis, as specified by the standard when it is manufactured or selected for design.

[0065] Step 120 includes: First, the axial displacement component, radial displacement component, and angular deflection component of the weld are extracted under each working condition.

[0066] Here, the axial displacement component refers to the tensile or compressive deformation of the weld along the pipe direction obtained from the simulation. Here, the radial displacement component refers to the lateral deformation perpendicular to the pipe direction. Here, the angular deflection component refers to the torsional or bending angle occurring at the pipe joint.

[0067] Specifically, after the multi-condition coupled simulation is completed, the finite element simulation results are post-processed to extract the axial displacement component, radial displacement component, and angular deflection component of the weld between the rigid sea passage pipeline and the ship's outer shell in the three-dimensional spatial coordinate system for each condition.

[0068] Then, the axial displacement component, the radial displacement component, and the angular deflection component under each working condition are combined in chronological order to generate the three-dimensional displacement envelope curve.

[0069] Specifically, the extracted axial displacement, radial displacement, and angular deflection components under all operating conditions, such as slipway closure, launching, full draft, and extreme sea states, are arranged and stitched together strictly according to the propulsion time sequence of the ship's entire life cycle. Thus, by combining and superimposing the displacement data in these three spatial dimensions, a three-dimensional displacement envelope curve that fully reflects the three-dimensional spatial deformation trajectory of the weld throughout its entire life cycle is ultimately generated.

[0070] The method provided in this invention extracts the three-dimensional displacement components of the weld joint, such as axial, radial, and angular displacements, under various working conditions and combines them in chronological order to generate an envelope curve. This method can comprehensively and accurately depict the real spatial multidimensional deformation trajectory of the weld joint under complex service environments, providing extremely accurate data boundary support for the selection and compensation parameters of flexible connectors in multiple dimensions such as axial, radial, and angular displacements.

[0071] Based on any of the above embodiments, in order to simulate the actual mechanical transmission law of the ship's sea passage system with high accuracy, the simulation model includes the hull finite element model of the ship's outer shell, the pipe finite element model of the rigid sea passage pipe, and the initial flexible nozzle parameterized model of the flexible nozzle.

[0072] The steps for constructing the simulation model include: The ship's hull and the rigid sea passage pipe are given elastic material properties, and the finite element model of the ship's hull and the finite element model of the pipe are constructed.

[0073] Here, the finite element model of a ship hull and the finite element model of a pipe refer to digital mathematical models that discretize continuous physical entities into a finite number of mesh elements for structural mechanics calculations. Here, elastic material properties refer to the conventional metallic mechanical properties of materials that deform under stress and return to their original shape after unloading.

[0074] Specifically, after obtaining the complete geometric model of the ship and removing small features with mass parameters below a preset threshold, the simplified model is imported into finite element analysis software, such as ANSYS, Abaqus, or MSC.Nastran. In the software, small features with mass parameters below the preset threshold are removed, retaining the hull, sea passage pipes, flexible nozzles, and main support structures. The hull and the rigid sea passage pipes, which mainly serve as rigid supports, are both treated as elastic bodies, and their corresponding mesh models are assigned appropriate elastic material properties, thus constructing the hull finite element model and the pipe finite element model.

[0075] Furthermore, the flexible nozzle is endowed with hyperelastic material properties and a nonlinear stiffness characteristic curve is set to construct the initial parametric model of the flexible nozzle.

[0076] Here, the hyperelastic material property refers to the mechanical characteristic of polymer materials such as rubber that can undergo extreme deformation without fracturing under stress. Here, the nonlinear stiffness characteristic curve refers to the physical law curve showing that the ability of a material or structure to resist deformation changes nonlinearly with changes in the stress state. Here, the initial flexible nozzle parameterized model refers to the initial calculation model of a flexible element whose dimensions and performance parameters can be dynamically adjusted.

[0077] Specifically, for the flexible nozzle, which serves as a flexible displacement compensation element, it is treated as a flexible body. In the finite element analysis software, it is given hyperelastic material properties, and the nonlinear stiffness characteristic curve obtained from actual material testing is imported to construct an initial parametric model of the flexible nozzle for subsequent iterative optimization.

[0078] In addition, a rigid coupling connection is established at the welded joint between the rigid sea passage pipe and the hull shell, and a hinged or elastic connection is established at the connection between the flexible nozzle and the rigid sea passage pipe.

[0079] Here, rigid coupling refers to a connection constraint method where two components are completely fixed and there is no relative displacement. Hinged or elastic connection refers to a connection constraint method that allows relative rotation or restricted elastic sliding between components.

[0080] Specifically, after completing the mesh generation and material property assignment, the connection relationships are constructed according to the actual assembly process. Rigid coupling connections are defined for the welded areas between the rigid sea passage pipe and the ship's outer shell; at the same time, for the connection areas such as the flange contact between the flexible nozzle and the rigid sea passage pipe, hinged or elastic connections that can transmit torque but allow a certain degree of relative motion are defined. After completing the constraint definitions, the model is verified, and finally a complete rigid-flexible coupled finite element model is formed, which is the simulation system of the ship's sea passage system.

[0081] The method provided in this invention, by assigning elastic material properties to the hull and rigid pipes, and assigning hyperelastic material properties with nonlinear stiffness curves to the flexible nozzles, and by accurately establishing rigid coupling connections as well as hinged or elastic connections, precisely constructs a rigid-flexible coupling finite element model covering the hull, rigid pipes and flexible nozzles, realistically restoring the typical rigid-flexible coupling mechanical transmission relationship inside the sea passage system, and laying the model foundation for achieving accurate simulation of the engineering deviation transmission law under various working conditions.

[0082] Based on any of the above embodiments Figure 3 This is a schematic diagram of the design device for the flexible nozzle of the ship's sea passage system provided by the present invention, as shown in the figure. Figure 3 As shown, the device includes: Simulation unit 310 performs continuous multi-condition simulations of the simulation model of the ship's sea passage system according to the entire life cycle, and inherits and transfers the physical quantity calculation results of the simulation model between each condition; the ship's sea passage system includes the hull shell, rigid sea passage pipes and flexible nozzles. The envelope curve generation unit 320 extracts the three-dimensional displacement field data of the weld between the rigid sea passage pipeline and the hull shell under each working condition, and generates the three-dimensional displacement envelope curve for the entire life cycle. The optimization unit 330 uses the three-dimensional displacement envelope curve as the boundary condition for the flexible nozzle design. With the goal of maximizing the basic safety margin of the flexible nozzle throughout the entire life cycle, it iteratively optimizes the design variables that satisfy the boundary condition to obtain the optimal flexible nozzle design scheme. The design variables include the nozzle selection parameters for the flexible nozzle.

[0083] The device provided in this invention performs continuous multi-condition simulations on a ship's sea passage system simulation model throughout its entire life cycle, inheriting and transferring physical quantity calculation results between conditions. It extracts three-dimensional displacement field data at the weld between the rigid sea passage pipe and the ship's outer shell under each condition, generating a three-dimensional displacement envelope curve for the entire life cycle. This envelope curve is used as the boundary condition for flexible nozzle design. With maximizing the basic safety margin throughout the entire life cycle as the optimization objective, it iteratively optimizes design variables, including nozzle selection parameters, to obtain the optimal flexible nozzle design scheme. This eliminates the risk of pipe breakage caused by complex deformation of the hull under different service conditions from the source, achieving a reasonable and scientific design of flexible nozzle selection parameters, and greatly improving the overall operational safety and design scientificity of the ship's sea passage system.

[0084] Based on any of the above embodiments, the design variables also include the support layout parameters of the rigid sea passage pipeline; The optimization unit is specifically used for: In each iteration of the simulation, the actual deformation of the flexible nozzle corresponding to the current design variable under each working condition is extracted. Calculate the single-condition safety margin between the actual deformation under each working condition and the allowable compensation corresponding to the flexible nozzle; The basic safety margin is obtained based on the minimum value among the single-condition safety margins under all operating conditions; The selection parameters of the nozzle and the support layout parameters of the rigid sea-crossing pipeline that satisfy the boundary conditions are iterated synchronously. Based on the selection parameters of the nozzle and the support layout parameters that maximize the foundation safety margin, the optimal flexible nozzle design scheme is obtained.

[0085] Based on any of the above embodiments, the multiple operating conditions under the whole life cycle include slipway assembly, launching, full draft, and extreme sea state conditions. The simulation unit is specifically used for: Under the aforementioned slipway closure condition, the self-weight load of each compartment is applied. Under the aforementioned drainage conditions, hydrostatic pressure and external load are applied; Under the full draft condition, hydrostatic pressures corresponding to multiple different draft depths are applied respectively; Under the aforementioned extreme sea conditions, wave loads and impact loads are applied.

[0086] Based on any of the above embodiments, the simulation unit is further specifically used for: Extract the calculation results of the previous physical quantity after the simulation of the previous working condition is completed on the simulation model; the calculation results of the previous physical quantity include the previous deformation and the previous stress. The calculation result of the previous physical quantity is used as the initial condition for the simulation calculation of the next adjacent working condition. The simulation model is then used to simulate the next adjacent working condition until the simulation of the last working condition in the entire life cycle is completed.

[0087] Based on any of the above embodiments, the nozzle selection parameters include nominal values ​​for axial compensation, radial compensation, and angular compensation. The envelope curve generation unit is specifically used for: Extract the axial displacement component, radial displacement component, and angular deflection component of the weld joint under each working condition; The axial displacement component, radial displacement component, and angular deflection component under each working condition are combined in chronological order to generate the three-dimensional displacement envelope curve.

[0088] Based on any of the above embodiments, the simulation model includes the hull finite element model of the ship's outer shell, the pipe finite element model of the rigid sea passage pipe, and the initial flexible nozzle parameterized model of the flexible nozzle. The simulation unit is also specifically used for: By assigning elastic material properties to the hull shell and the rigid sea passage pipe, a finite element model of the hull and a finite element model of the pipe are constructed. The flexible nozzle is given hyperelastic material properties and a nonlinear stiffness characteristic curve is set to construct the initial parametric model of the flexible nozzle; A rigid coupling connection is established at the welded joint between the rigid sea passage pipe and the hull shell, and a hinged or elastic connection is established at the joint between the flexible nozzle and the rigid sea passage pipe.

[0089] Figure 4 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 4As shown, the electronic device may include: a processor 410, a communication interface 420, a memory 430, and a communication bus 440, wherein the processor 410, the communication interface 420, and the memory 430 communicate with each other through the communication bus 440. The processor 410 can call logic instructions in the memory 430 to execute a design method for a flexible nozzle in a ship's sea passage system. This method includes: performing continuous multi-condition simulations on a simulation model of the ship's sea passage system throughout its entire life cycle, and inheriting and transferring the physical quantity calculation results between different conditions; the ship's sea passage system includes a hull, a rigid sea passage pipe, and a flexible nozzle; extracting three-dimensional displacement field data at the weld between the rigid sea passage pipe and the hull under each condition, generating a three-dimensional displacement envelope curve for the entire life cycle; using the three-dimensional displacement envelope curve as the boundary condition for the flexible nozzle design, with the optimization objective of maximizing the basic safety margin of the flexible nozzle throughout its entire life cycle, iteratively optimizing the design variables that satisfy the boundary condition to obtain the optimal flexible nozzle design scheme; the design variables include nozzle selection parameters for the flexible nozzle.

[0090] Furthermore, the logical instructions in the aforementioned memory 430 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0091] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the design method for flexible nozzles of ship navigation systems provided by the above methods. The method includes: performing continuous multi-condition simulations of a simulation model of the ship navigation system according to the entire life cycle, and inheriting and transferring the physical quantity calculation results of the simulation model between each condition; the ship navigation system includes a hull shell, a rigid navigation pipe, and a flexible nozzle; extracting three-dimensional displacement field data of the weld between the rigid navigation pipe and the hull shell under each condition, and generating a three-dimensional displacement envelope curve for the entire life cycle; using the three-dimensional displacement envelope curve as the boundary condition for the flexible nozzle design, with the optimization objective of maximizing the basic safety margin of the flexible nozzle in the entire life cycle, iteratively optimizing the design variables that satisfy the boundary condition to obtain the optimal flexible nozzle design scheme; the design variables include the nozzle selection parameters of the flexible nozzle.

[0092] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon. When executed by a processor, the computer program implements a design method for a flexible nozzle of a ship's sea passage system provided by the methods described above. This method includes: performing continuous multi-condition simulations of a simulation model of the ship's sea passage system throughout its entire life cycle, and inheriting and transferring the physical quantity calculation results of the simulation model between different conditions; the ship's sea passage system includes a hull, a rigid sea passage pipe, and a flexible nozzle; extracting three-dimensional displacement field data at the weld between the rigid sea passage pipe and the hull under each condition, generating a three-dimensional displacement envelope curve for the entire life cycle; using the three-dimensional displacement envelope curve as the boundary condition for the flexible nozzle design, with the optimization objective of maximizing the basic safety margin of the flexible nozzle throughout its entire life cycle, iteratively optimizing the design variables that satisfy the boundary condition to obtain the optimal flexible nozzle design scheme; the design variables include nozzle selection parameters for the flexible nozzle.

[0093] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0094] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0095] 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 design method for a flexible nozzle in a ship's sea passage system, characterized in that, include: The simulation model of the ship's sea passage system is continuously simulated under multiple operating conditions according to the entire life cycle, and the calculation results of physical quantities are inherited and transferred between the simulation models under different operating conditions; the ship's sea passage system includes the hull shell, rigid sea passage pipes and flexible nozzles. Extract the three-dimensional displacement field data of the weld between the rigid sea passage pipeline and the hull shell under each working condition, and generate the three-dimensional displacement envelope curve for the entire life cycle; The three-dimensional displacement envelope curve is used as the boundary condition for the flexible nozzle design. The optimization objective is to maximize the basic safety margin of the flexible nozzle throughout its entire life cycle. The design variables that satisfy the boundary condition are iteratively optimized to obtain the optimal flexible nozzle design scheme. The design variables include the nozzle selection parameters for the flexible nozzle.

2. The method of designing a flexible marine riser for a marine vessel sea passage system of claim 1, wherein, The design variables also include the support layout parameters of the rigid sea-access pipeline; The optimization objective is to maximize the basic safety margin of the flexible nozzle throughout its entire life cycle. Iterative optimization is performed on the design variables that satisfy the boundary conditions to obtain the optimal flexible nozzle design scheme, including: In each iteration of the simulation, the actual deformation of the flexible nozzle corresponding to the current design variable under each working condition is extracted. Calculate the single-condition safety margin between the actual deformation under each working condition and the allowable compensation corresponding to the flexible nozzle; The basic safety margin is obtained based on the minimum value among the single-condition safety margins under all operating conditions; The selection parameters of the nozzle and the support layout parameters of the rigid sea-crossing pipeline that satisfy the boundary conditions are iterated synchronously. Based on the selection parameters of the nozzle and the support layout parameters that maximize the foundation safety margin, the optimal flexible nozzle design scheme is obtained.

3. The method of designing a flexible marine pipe for a marine vessel sea passage system of claim 1, wherein, The multiple operating conditions throughout the entire life cycle include slipway assembly, launching, full draft, and extreme sea state conditions. The continuous multi-condition simulation of the simulation model according to the entire life cycle includes: Under the aforementioned slipway closure condition, the self-weight load of each compartment is applied. Under the aforementioned drainage conditions, hydrostatic pressure and external load are applied; Under the full draft condition, hydrostatic pressures corresponding to multiple different draft depths are applied respectively; Under the aforementioned extreme sea conditions, wave loads and impact loads are applied.

4. A method of designing a flexible marine riser for a marine vessel sea passage system according to any one of claims 1 to 3, characterised in that, The inheritance and transfer of physical quantity calculation results of the simulation model across different operating conditions includes: Extract the calculation results of the previous physical quantity after the simulation of the previous working condition is completed on the simulation model; the calculation results of the previous physical quantity include the previous deformation and the previous stress. The calculation result of the previous physical quantity is used as the initial condition for the simulation calculation of the next adjacent working condition. The simulation model is then used to simulate the next adjacent working condition until the simulation of the last working condition in the entire life cycle is completed.

5. A method of designing a flexible marine riser for a marine vessel sea passage system according to any one of claims 1 to 3, wherein, The nozzle selection parameters include nominal values ​​for axial compensation, radial compensation, and angular compensation. The step of extracting the three-dimensional displacement field data of the weld between the rigid sea passage pipeline and the ship's outer shell under each working condition, and generating the three-dimensional displacement envelope curve for the entire life cycle, includes: Extract the axial displacement component, radial displacement component, and angular deflection component of the weld joint under each working condition; The axial displacement component, radial displacement component, and angular deflection component under each working condition are combined in chronological order to generate the three-dimensional displacement envelope curve.

6. The design method for the flexible nozzle of a ship's sea passage system according to any one of claims 1 to 3, characterized in that, The simulation model includes the finite element model of the ship's outer shell, the finite element model of the rigid sea passage pipe, and the initial parametric model of the flexible nozzle. The steps for constructing the simulation model include: By assigning elastic material properties to the hull shell and the rigid sea passage pipe, a finite element model of the hull and a finite element model of the pipe are constructed. The flexible nozzle is given hyperelastic material properties and a nonlinear stiffness characteristic curve is set to construct the initial parametric model of the flexible nozzle; A rigid coupling connection is established at the welded joint between the rigid sea passage pipe and the hull shell, and a hinged or elastic connection is established at the joint between the flexible nozzle and the rigid sea passage pipe.

7. A design device for a flexible nozzle in a ship's sea passage system, characterized in that, include: The simulation unit performs continuous multi-condition simulations of the simulation model of the ship's sea passage system according to the entire life cycle, and inherits and transfers the physical quantity calculation results of the simulation model between each condition; the ship's sea passage system includes the hull shell, rigid sea passage pipes and flexible nozzles. The envelope curve generation unit extracts the three-dimensional displacement field data of the weld between the rigid sea passage pipeline and the hull shell under each working condition, and generates the three-dimensional displacement envelope curve for the entire life cycle. The optimization unit uses the three-dimensional displacement envelope curve as the boundary condition for the flexible nozzle design. With the goal of maximizing the basic safety margin of the flexible nozzle throughout its entire life cycle, it iteratively optimizes the design variables that satisfy the boundary condition to obtain the optimal flexible nozzle design scheme. The design variables include the nozzle selection parameters for the flexible nozzle.

8. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the design method for the flexible nozzle of the ship's sea passage system as described in any one of claims 1 to 6. 9.A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that, When the computer program is executed by the processor, it implements the design method for the flexible nozzle of the ship's sea passage system as described in any one of claims 1 to 6.

10. A computer program product comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the design method for the flexible nozzle of the ship's sea passage system as described in any one of claims 1 to 6.

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