Breakwater floating body, structure optimization method and equipment of breakwater floating body and storage medium

Abstract

The invention provides a breakwater floating body, a breakwater floating body structure optimization method and device and a storage medium, and the breakwater floating body comprises a first floating body which is fixed through a mooring rope and floats in the ocean; the second floating body is connected with the first floating body, open holes are formed in the surface of the second floating body, and the second floating body is hollow, so that the second floating body is communicated with seawater; the multiple damping parts are evenly distributed on the periphery of the second floating body at equal intervals, and each damping part is connected with the surface of the second floating body through a connecting piece; the damping parts are hollow, and the upper surfaces and the lower surfaces of the damping parts are provided with open holes to restrain the heaving motion of seawater. The structural parameters of the floating body of the damping component are iteratively optimized through the structural optimization method of the breakwater floating body, so that the stability and the wave resistance effect of the whole breakwater floating body are improved, the problem that potential risks are possibly caused by insufficient stability of a traditional floating breakwater is solved, and the safety of ships, coast and offshore structures is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of floating breakwaters, and particularly to a breakwater floating body, a method for optimizing the structure of the breakwater floating body, equipment and a storage medium. Background Art

[0002] A breakwater, as an important water structure specifically designed to block wave attacks, protect the port area, and ensure a stable water surface, is crucial for the safe berthing and efficient operation of ships. Among them, the floating breakwater is an important type due to its flexibility. Such a breakwater usually consists of two core components: a floating body and an anchor chain system. Its working principle is to use the front wave-facing surface of the floating breakwater to reflect the wave height, and through forming a phase difference with the incident wave and a reasonable length layout of the floating breakwater along the wave propagation direction, causing the waves to gradually break on the surface of the floating breakwater and experience friction, thereby effectively dissipating wave energy, reducing the energy of the transmitted wave, and achieving the purpose of reducing the wave height behind the breakwater.

[0003] However, the floating breakwater faces complex and changeable mechanical challenges in the ocean. In particular, the forces from all directions cause it to have multi-directional movements, especially the violent vibration in the heaving direction, which has become a key problem to be solved urgently. The current technology relies on the single action of the anchor chain system and is difficult to fully suppress the heaving motion of the floating breakwater in the ocean environment, and it is difficult to ensure the overall stability of the breakwater. This limitation may not only weaken the expected effectiveness of the breakwater but also pose a potential threat to the berthed ships, coastal areas, and adjacent marine structures, affecting the safety and efficiency of offshore operations. Summary of the Invention

[0004] Embodiments of the present invention provide a breakwater floating body, a method for optimizing the structure of the breakwater floating body, equipment and a storage medium to solve the problems existing in the related technology. The technical solutions are as follows:

[0005] In a first aspect, embodiments of the present invention provide a breakwater floating body, including:

[0006] A first floating body, which is fixed by an anchor chain and floats in the ocean;

[0007] A second floating body, which is connected to the first floating body. The surface of the second floating body is provided with openings and is hollow inside, so that the second floating body is in communication with seawater;

[0008] Damping components, a plurality of damping components are evenly distributed at equal intervals around the second floating body, and each damping component is respectively connected to the surface of the second floating body through a connecting member; each damping component is hollow inside and openings are arranged on the upper and lower surfaces of the damping component to inhibit the heaving motion of seawater.

[0009] In an implementation manner, a ballast space is provided inside the first floating body, and a set amount of liquid is stored in the ballast space to make the water entry depth of the first floating body reach a preset depth.

[0010] In one embodiment, the inside of the connecting member is hollow, so that the damping member is connected to the inside of the second floating body through the connecting member to form a gap water channel.

[0011] In one embodiment, the opening on the second floating body is provided on the bottom surface of the second floating body.

[0012] In a second aspect, an embodiment of the present invention provides a method for optimizing the structure of a breakwater floating body as described above, including:

[0013] Obtain the actual sea condition data of the location of the breakwater floating body, input the actual sea condition data into a pre-established hydrodynamic model, and output the motion characteristic parameters and environmental loads of the breakwater floating body, where the environmental loads include the acting force of the mooring cable tension on the breakwater floating body;

[0014] Based on the floating body motion equation, determine the motion amplitude of the breakwater floating body under the action of the load according to the motion characteristic parameters and environmental loads;

[0015] Based on the genetic algorithm, optimize the floating body structure parameters of the breakwater floating body, and use the natural period, motion amplitude, and mooring cable tension during the motion of the breakwater floating body as constraint conditions to determine that the combination of structure parameters that meets the optimization goal is the optimal structure parameters.

[0016] In one embodiment, the motion characteristic parameters include a structural mass matrix, a floating body added mass matrix, a damping matrix, a viscous damping matrix, and a hydrostatic restoring force matrix.

[0017] In one embodiment, determining the motion amplitude of the breakwater floating body under the action of the load based on the floating body motion equation according to the motion characteristic parameters and environmental loads includes:

[0018] Import the motion characteristic parameters and environmental loads into the floating body motion equation, calculate the deformation of the breakwater floating body under the action of the load, and obtain the target displacement;

[0019] Based on a preset transfer function, convert the target displacement into a dimensionless motion amplitude.

[0020] In one embodiment, the optimal structure parameters are the floating body structure parameters with the smallest transmission coefficient and the smallest mass. The floating body structure parameters include the height, width, and opening size of the damping member in the breakwater floating body.

[0021] In a third aspect, an embodiment of the present invention provides an electronic device, which includes: a memory and a processor. Wherein, the memory and the processor communicate with each other through an internal connection path. The memory is used to store instructions, and the processor is used to execute the instructions stored in the memory. When the processor executes the instructions stored in the memory, the processor is caused to execute the method in any one of the above aspects and embodiments.

[0022] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, which stores a computer program. When the computer program runs on a computer, the method in any one of the above aspects and embodiments is executed.

[0023] The advantages or beneficial effects in the above technical solutions at least include:

[0024] The present invention utilizes the second floating body with openings and the damping member with openings to effectively suppress the heaving motion of the breakwater floating body, optimize the heaving motion performance and wave dissipation effect of the breakwater floating body. At the same time, the damping member has a positive effect on increasing the natural period of the breakwater floating body's motion in each degree of freedom, enabling the breakwater floating body to be far from the wave period and avoid resonance.

[0025] At the same time, the floating body structure parameters of the damping member are iteratively optimized through the structural optimization method of the breakwater floating body to improve the overall stability and wave dissipation effect of the breakwater floating body, solve the problem of potential danger caused by insufficient stability of traditional floating breakwaters, meet the wave dissipation function of the breakwater, and greatly improve the safety of ships, coasts and offshore structures.

[0026] The above summary is only for the purpose of the specification and is not intended to be limiting in any way. In addition to the above-described illustrative aspects, embodiments and features, further aspects, embodiments and features of the present invention will be readily apparent by reference to the drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In the drawings, unless otherwise specified, the same reference numerals throughout the several views denote the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in accordance with the present invention and should not be regarded as limiting the scope of the present invention.

[0028] Figure 1 It is a schematic diagram of the structure of the breakwater floating body of the present invention fixed in water;

[0029] Figure 2 It is a top view of the breakwater floating body of the present invention under the constraint of anchor chains;

[0030] Figure 3Schematic three-dimensional structure diagram of the breakwater floating body of the present invention;

[0031] Figure 4 Schematic flow chart of the structural optimization method of the breakwater floating body of the present invention;

[0032] Figure 5 Flow chart of the structural optimization design algorithm of the breakwater structure of the present invention;

[0033] Figure 6 Block diagram of the structure of an electronic device according to an embodiment of the present invention.

[0034] In the figure: 1, the first floating body; 2, the anchor chain; 3, the ballast space; 4, the second floating body; 5, the damping component; 6, the connecting piece. Detailed implementation manners

[0035] In the following text, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0036] Embodiment 1

[0037] This embodiment provides a breakwater floating body. Combining Figures 1 to 3 As shown, the breakwater floating body mainly includes a first floating body 1, a second floating body 4, an anchor chain 2, a damping component 5, and a connecting piece 6.

[0038] The first floating body 1, also known as the main floating box, is the main body for reflecting waves and dissipating wave energy. Anchor chains 2 are symmetrically arranged on the left / right or front / back sides of the first floating body 1. A cylindrical anchor can be connected through the anchor chain 2 and the cylindrical anchor is sunk into the seabed, thereby playing a role in stabilizing the main floating box.

[0039] In addition, a catenary mooring cable (usually composed of materials such as the anchor chain 2 and polyester cable) can also be used to connect the breakwater to the anchor point on the seabed to provide a stable pulling force.

[0040] It should be noted that the catenary mooring system mainly consists of the anchor chain 2, buoys, etc. Among them, the anchor chain 2 is the core component of the system. One end of it is connected to the anchor point on the seabed, and the other end is connected to a floating structure such as a buoy. The floating structure is used to increase the buoyancy of the anchor chain 2 and reduce its sag in the water, thereby optimizing the mooring performance. The floating structure is connected to the first floating body 1 through a connecting component. At the same time, the anchor chain 2 remains taut, and the first floating body 1 vertically sinks under the action of gravity and keeps the position of the first floating body 1 stable, preventing it from drifting or getting out of control.

[0041] Preferably, a ballast space 3 is provided inside the first floating body 1. The ballast space 3 can be a space formed by partially hollowing out the first floating body 1. A certain amount of liquid is stored in the ballast space 3. For example, seawater is used as the ballast material to increase the gravity of the first floating body 1, so that the first floating body 1 has a normal floating state in water. The amount of liquid in the ballast space 3 is set according to the size of the ballast space 3 and the required water entry depth of the first floating body 1, so that the first floating body 1 can stably and vertically sink to a preset depth in the ocean.

[0042] And a second floating body 4 having the same size as the first floating body 1 is arranged below the first floating body 1. The second floating body 4 can be regarded as an extension of the first floating body 1. The second floating body 4 is connected to the first floating body 1 to ensure that the movements of the first floating body 1 and the second floating body 4 are synchronized in the ocean.

[0043] The second floating body 4 is hollow inside and on the surface of the second floating body 4, specifically, holes can be opened on the lower surface of the second floating body 4, so that the internal space of the second floating body 4 is connected to the seawater. The holes on the lower surface of the second floating body 4 can be circular holes, or can be set to other shapes according to the actual situation, which will not be listed one by one here.

[0044] A plurality of connecting members 6 are equally spaced and distributed on the peripheral sides of the second floating body 4. One end of the connecting member 6 is connected to the side surface of the second floating body 4, and the other end of the connecting member 6 is connected to the damping member 5. Each connecting member 6 is a hollow structure, and each damping member 5 is also set as a hollow structure, so that the second floating body 4, the connecting member 6 and the damping member 5 are connected and communicated with each other.

[0045] The number of the connecting members 6 corresponds to the number of the damping members 5, and the distribution positions of the connecting members 6 and the distribution positions of the damping members 5 also correspond to each other, that is, all the damping members 5 are also equally spaced and uniformly distributed around the second floating body 4, and each damping member 5 needs its corresponding connecting member 6 to be connected to the second floating body 4.

[0046] In this embodiment, eight connecting members 6 are welded to the outer surface of the second floating body 4 at equal intervals. The second floating body 4 is set as a cuboid or cube structure. Two connecting members 6 are arranged on each outer side surface of the second floating body 4. The other end of each connecting member 6 is welded to a damping member 5 with a rectangular cross section. Circular holes with the same size are arranged at the centers of the upper and lower cross sections of each damping member 5, so that seawater can freely flow into the damping member 5 and flow into the second floating body 4 through the connecting member 6, realizing the automatic circulation of seawater, thereby suppressing the heaving motion of seawater.

[0047] Based on the premise that the traditional floating breakwater is fixed by the anchor chain 2 system, this embodiment adds a damping component 5 with openings to suppress the heaving motion and enhance the energy dissipation effect. The second floating body 4 with openings increases the draft of the first floating body 1 to improve the wave reflection effect and reduce the transmission coefficient. Eight connecting members 6 are evenly arranged at equal intervals in the outer circumferential direction of the second floating body 4. The damping component 5 distributed annularly outside the second floating body 4 is firmly connected through the connecting members 6, and an interstitial water channel is formed among the second floating body 4, the connecting members 6, and the damping component 5, increasing the wetted surface area of the entire breakwater and thus increasing the viscous damping of the breakwater.

[0048] Moreover, the damping component 5 itself can suppress the motion of the floating body to a certain extent and jointly form a motion suppression device with the second floating body 4. The damping component 5 and the second floating body 4 are both provided with pores, which can ensure that the water body inside the motion suppression device is connected to the external seawater, canceling out the hydrostatic pressure inside and outside the structure. This not only does not increase the additional displacement of the overall structure but also can improve the added water mass of the structure. At the same time, the water bodies inside and outside the motion suppression device can flow freely through the openings, increasing the fluid damping received by the structure and achieving the effect of suppressing the heaving motion.

[0049] The floating body of the breakwater in this embodiment utilizes the second floating body 4 with openings and the damping component 5, which is beneficial to optimizing the heaving motion performance and wave dissipation effect of the floating body of the breakwater. At the same time, the damping component 5 has a positive effect on increasing the natural period of the motion of the floating body of the breakwater in each degree of freedom, enabling the floating body of the breakwater to be far from the wave period and avoiding resonance.

[0050] Embodiment Two

[0051] This embodiment provides a structural optimization method for the floating body of a breakwater. This method studies the interaction between the floating body of the breakwater in Embodiment One and the waves to determine whether the size and opening conditions of the floating body of the breakwater in Embodiment One meet the design requirements and safety standards. If necessary, the structure of the floating body of the breakwater is optimized to improve the wave dissipation capacity and stability.

[0052] Specifically, as Figure 4 shown, the structural optimization method of the floating body of the breakwater in this embodiment specifically includes:

[0053] Step S1: Obtain the actual sea condition data at the location of the floating body of the breakwater and input the actual sea condition data into a pre-established hydrodynamic model to output the motion characteristic parameters and environmental loads of the floating body of the breakwater, where the environmental loads include the acting force of the mooring cable tension on the floating body of the breakwater.

[0054] The actual sea condition data at the location of the floating body of the breakwater includes local wave height, wave period, etc.

[0055] The hydrodynamic model can be pre-modeled through hydrodynamic calculation software such as SESAM or WAMIT. The obtained hydrodynamic model combines the actual contact situation between the breakwater floating body and seawater to analyze the hydrodynamic and static forces. Specifically, a breakwater wet surface element model is established at a scale of 1:1. The transparent horizontal plane is the still water surface, and the area below the water surface is the wet surface element. The inner and outer surfaces of the second floating body of the breakwater floating body and the inner and outer surfaces of the damping components are all given wet surface properties to ensure the connection between the internal water body of the breakwater floating body and the external seawater. After the initial model is established, according to the actual sea condition data of the location of the breakwater floating body, such as local wave height, wave period, etc., the input environmental conditions are used to simulate the motion characteristic parameters and environmental loads of the breakwater floating body.

[0056] In this embodiment, the motion characteristic parameters include the structural mass matrix, the floating body added mass matrix, the damping matrix, the viscous damping matrix, and the hydrostatic restoring force matrix. The environmental loads include the force of the waves on the breakwater floating body and the force of the mooring cable tension on the breakwater floating body.

[0057] It should be noted that the structural mass matrix is a matrix that describes the inertial characteristics of the breakwater floating body. By calculating the structural mass matrix, the response of the breakwater floating body under dynamic loads can be more accurately simulated, providing a theoretical basis for structural design and optimization.

[0058] In this embodiment, the mass matrix M is a 6×6 matrix, and when expanded, it is expressed as:

[0059]

[0060] Among them, m is the floating body mass of the entire breakwater floating body; I ij is the floating body moment of inertia of the entire breakwater floating body, where i and j are indices used to represent the rows and columns in the moment of inertia matrix; (x G , y G , z G ) is the center of gravity position of the floating body of the entire breakwater floating body.

[0061] The floating body added mass matrix is a matrix that describes the mass characteristics added to the breakwater floating body due to the inertial effect of the fluid when the breakwater floating body moves in the fluid.

[0062] In this embodiment, according to the actual sea condition data of the location of the breakwater floating body and the calculation formula of the floating body added mass matrix, the floating body added mass matrix is calculated. The calculation formula of the floating body added mass matrix is:

[0063]

[0064] d is the water depth; Φ j is the decomposed radiation potential; S0 is the wet surface area of the entire breakwater floating body.

[0065] It should be noted that the radiation potential refers to the radiation potential obtained by decomposing the total velocity potential under the potential flow theory. Taking the breakwater floating body as an example, the radiation potential Φ j is solved from the control equations and boundary conditions. The control equation of the radiation potential (Laplace equation) is the Laplace equation based on the potential flow theory, and its core is to describe the distribution of the fluid velocity potential φ in the flow field. The control equation of the radiation potential is:

[0066]

[0067] Boundary conditions for solving the radiation potential:

[0068] ① The boundary condition on the body surface, that is, the fluid can move along the surface of the breakwater floating body but cannot penetrate the body surface. The boundary condition on the body surface is:

[0069]

[0070] where n is the unit outer normal vector at any point on the surface of the breakwater floating body, represents the derivative of the fluid velocity potential in the normal direction of the breakwater floating body surface, reflecting the normal velocity of the fluid on the breakwater floating body surface.

[0071] ② The far-field boundary condition. The fluid at infinity is not affected by the movement of the object and is stationary. The far-field boundary condition is:

[0072]

[0073] where R is the radius of the domain. The far-field boundary condition means that at infinity, the potential function of the radiation wave should tend to zero.

[0074] ③ The free surface boundary condition, which is used to describe the movement of the fluid on the free surface. The free surface boundary condition requires that on the free surface, the vertical acceleration of the fluid is equal to the resultant force of the gravitational acceleration and the surface tension of the fluid. Specifically, the free surface boundary condition can be expressed as:

[0075]

[0076] where z is the vertical coordinate, and the free surface is usually located at z = 0; t is the time.

[0077] ④ The seabed boundary condition, which is used to describe the movement state of the fluid at the seabed. The seabed boundary condition requires that the normal velocity of the fluid at the seabed is zero, that is, there is no vertical movement of the fluid at the seabed. The seabed boundary condition is expressed as:

[0078]

[0079] where d is the water depth.

[0080] The decomposed radiation potential Φ in this embodiment j reflects the disturbance of the breakwater floating body's motion to the surrounding fluid. By solving the above control equations and boundary conditions, the fluid velocity potential φ caused by the breakwater floating body's motion can be obtained, and then used to calculate hydrodynamic characteristics such as added mass and damping.

[0081] The damping matrix is a matrix used to describe the energy dissipation mechanism of the system in structural dynamics. The calculation representative formula of the damping matrix λ is:

[0082]

[0083] where Im refers to taking the imaginary part of a complex number, and ω is the wave angular frequency (T is the wave period), and the meanings of other parameters are the same as those in the calculation formula of the floating body added mass matrix, which will not be described repeatedly here.

[0084] Because based on the potential flow theory, it is considered that the liquid is non-viscous and the influence of the viscous damping matrix Δλ cannot be considered. Therefore, the method of artificially adding damping is used to estimate the added damping of the breakwater and the motion suppression device, and the common value is taken as 8% according to the empirical formula.

[0085] The hydrostatic restoring force matrix is a stiffness characteristic matrix that describes the restoring force generated due to the imbalance between buoyancy and gravity of the floating body in the hydrostatic state. It reflects the relationship between the restoring force and the displacement when the floating body deviates from the equilibrium position. In this embodiment, the hydrostatic restoring force matrix C is also a 6×6 matrix, and after expansion, it is shown as:

[0086]

[0087] where A w is the waterplane area; (x B , y B , z B ) are the coordinates of the center of buoyancy, and the center of buoyancy refers to the centroid of the underwater part volume of the entire breakwater floating body, which can be regarded as the acting point of buoyancy; (x f , y f ) are the coordinates of the center of flotation of the waterplane; V is the displacement of the entire breakwater floating body, which is calculated according to the volume below the water surface line of the breakwater floating body; S 11 , S 22 , S 12 represent the second moment of the sectional area of the structure on the water surface, and the specific calculation is as follows (S0 is the average wet surface of the breakwater):

[0088]

[0089] The environmental load F includes the wave action and the mooring cable tension T action, which are calculated according to the actual environmental conditions.

[0090] The generalized wave force acting on the breakwater floating body includes force and moment, which is the integral resultant force of the pressure exerted by the fluid on the breakwater floating body, i.e.:

[0091] Generalized wave force F i = ∫∫ S pn i dS (i = 1, 2, 3)

[0092] Moment F i = ∫∫ s p(r × n i )dS (i = 4, 5, 6)

[0093] In the formula, n is the unit outer normal vector at any point on the surface S of the breakwater floating body; r is the radial vector from any point on the surface S of the breakwater floating body to the moment-taking point, and the moment-taking point refers to the center of buoyancy of the breakwater floating body; p is the wave pressure at each point on the surface S of the breakwater floating body; i is six degrees of freedom.

[0094] The tension T of the mooring cable is iteratively calculated in the calculation software through the following formula:

[0095] T = EA × ε

[0096] In the formula, EA is the tensile stiffness of the cable, and ε is the deformation of the cable, which is calculated by subtracting the unstretched length of the cable from the real-time distance from the mooring point to the anchor point.

[0097] The cable tension is a value that changes with time. The dynamic analysis method is adopted for the analysis of the mooring cable. The idea is to divide the mooring cable into several segments, each segment having its own motion and force. By independently analyzing each segment of the cable, the motion and tension changes of each segment within different time steps are gradually calculated, so as to obtain the tension response of the entire cable system in a dynamic environment. Specifically, for each independent segment analysis, the motion of the cable within this time step is calculated according to the initial conditions and initial pre-tension in the initial time step. The deformation generated by the motion is used to calculate the tension T through the mooring cable tension formula, and the motion of the cable in the next time step is calculated from this tension, and so on until the end of the time, to obtain one of the target parameters, the cable tension T.

[0098] The hydrodynamic model of this embodiment adopts the above various calculation formulas to calculate the motion characteristic parameters including the structural mass matrix, the added mass matrix of the floating body, the damping matrix, the viscous damping matrix, and the hydrostatic restoring force matrix, and obtains the environmental loads including the wave action and the mooring cable tension action.

[0099] Step S2: Determine the motion amplitude of the breakwater floating body under the action of the load according to the motion characteristic parameters and the environmental load based on the floating body motion equation.

[0100] Based on the theoretical basis of potential flow theory, the floating body motion equation is given according to Newton's second law as:

[0101]

[0102] In the formula, M is the structural mass matrix; ΔM is the added mass matrix of the floating body; λ is the damping matrix; Δλ is the viscous damping matrix; C is the hydrostatic restoring force matrix; F is the environmental load; X, are displacement, velocity and acceleration (six degrees of freedom).

[0103] In this embodiment, the motion characteristic parameters and environmental loads obtained in step S1 are introduced into the floating body motion equation, and the deformation of the breakwater floating body under the action of the load is calculated through the floating body motion equation to obtain the target displacement X.

[0104] Based on a preset transfer function, the target displacement X is converted into the motion amplitude RAO (Response Amplitude Operator) of a dimensionless number. Specifically, let X = X0e -iωt , F = F0e -iωt , then X0 = HF0;

[0105] Among them, X0 is the amplitude of the displacement, e -iωt is a complex exponential function representing the change of displacement with time, ω is the angular frequency, and t is the time; F0 is the amplitude of the environmental load, e -iωt also represents a complex exponential function of the load changing with time; H is the transfer function, and the expression of the transfer function is:

[0106] H = (C - (M + ΔM)ω 2 - (λ + Δλ)iω 2 )

[0107] Through the transfer function H, the target displacement X can be converted into the dimensionless motion amplitude RAO (Response Amplitude Operator), thereby providing a judgment basis for the optimization of the breakwater floating body.

[0108] The mooring cable tension T and the motion amplitude RAO respectively reflect the load and motion response characteristics of the breakwater floating body. In this embodiment, when the height, width, and opening size of the damping component of the breakwater floating body are known, by calculating the mooring cable tension T and the motion amplitude RAO, it is determined whether the current breakwater floating body meets the design requirements and safety standards according to the values of the mooring cable tension T and the motion amplitude RAO. When the mooring cable tension T is lower than or equal to a preset first threshold, and the motion amplitude RAO is also lower than or equal to a preset second threshold, which is equivalent to the case where both the mooring cable tension T and the motion amplitude RAO are small, it represents that the height, width, and opening size of the damping component of the current breakwater floating body are the optimal structural parameter combinations. Assuming that the mooring cable tension T is higher than the first threshold or the motion amplitude RAO is higher than the second threshold, it means that the mooring cable tension T or the motion amplitude RAO is too large, indicating that the motion amount of the breakwater floating body is large. Then, it can be determined that the structural parameter design of the current breakwater floating body is unreasonable. At this time, step S3 is executed to perform necessary structural optimization on the breakwater floating body to improve the wave dissipation capacity and stability. The ultimate goal of the optimization is to try to find the optimal structural parameter combination, under which both the mooring cable tension T and the motion amplitude RAO are small, so as to achieve the purpose of reducing the motion amount of the breakwater floating body and ensuring the safety of the cable.

[0109] During this period, when necessary, the computational fluid dynamics method can be used to consider the damping caused by fluid viscosity to more accurately predict the motion response of the floating breakwater floating body under the action of waves.

[0110] Step S3: Optimize the floating body structure parameters of the breakwater floating body based on the genetic algorithm, and use the natural period, motion amplitude, and mooring cable tension during the motion of the breakwater floating body as constraint conditions to determine the structural parameter combination that meets the optimization goal as the optimal structural parameters.

[0111] In this embodiment, the optimization goal and constraint conditions are determined in advance. The optimization goal is to minimize the transmission coefficient of the breakwater (i.e., reduce the energy of the wave passing through the breakwater) and the mass (i.e., reduce the material consumption); the constraint conditions include the natural period, motion amount (i.e., displacement, velocity, acceleration, etc.) during the motion of the breakwater, and the tension of the mooring cable. These constraint conditions ensure the stability and safety of the breakwater floating body during actual use.

[0112] Common optimization algorithms include: gradient-based optimization algorithms, genetic algorithms (such as the second-generation non-dominated sorting genetic algorithm NSGA-II), neural network algorithms, ant colony algorithms, or simulated annealing algorithms, etc. Due to the mutual constraints between parameter variables and the non-linear relationship between parameter variables and the parameters of the optimization sub-objectives, the optimization algorithm in this embodiment adopts the multi-objective genetic algorithm (Multi-Objective Genetic Algorithm, MOGA), which is an optimization technique based on the genetic algorithm (Genetic Algorithm, GA) and is specifically used to solve optimization problems involving multiple conflicting objectives, supports multiple objectives and constraints, and aims to find the global optimal value.

[0113] Specifically, in this embodiment, through the multi-objective genetic algorithm, a set of structural parameter combinations are randomly generated. The structural parameter combinations include the height of the damping component in the breakwater floating body, the width of the damping component, and the opening size of the damping component, etc. These parameters will affect the performance of the breakwater, including its response to waves and the stability of the structure. Calculate the performance indicators (such as transmission coefficient and mass) of the breakwater according to the randomly generated structural parameter combinations. The multi-objective genetic algorithm will judge whether these parameter combinations are feasible according to the preset constraint conditions. The parameter combinations that meet the constraint conditions will be retained, and those that do not meet will be eliminated.

[0114] Such as Figure 5 shown, Figure 5 As shown in the figure, it is the flow chart of the multi-objective genetic algorithm. After defining the variables, objective functions, and any constraint conditions in the optimization problem, set the initial generation (gen) to 1, which represents the first round of iteration of the algorithm. Calculate the fitness (objective value) of each individual in the current population, create an initial population according to a certain strategy (random generation), each individual represents a potential solution, evaluate the fitness of each individual in the population (fitness function calculation), and check whether the termination conditions are met, such as reaching the maximum number of iterations (max gen), finding a satisfactory solution, or the algorithm converges. If satisfied, the algorithm ends; if not, continue to execute. Subsequently, genetic operations are performed on the current population, including crossover (pairing and recombining part of the genes of individuals) and mutation (randomly changing some genes of individuals) to generate a new population. Check whether the current generation is less than the maximum generation. If so, increase the generation and establish a new population model; if not, the algorithm converges, ends, and outputs the optimized parameter variable combination.

[0115] In this embodiment, the multi-objective genetic algorithm will continuously change and optimize the parameter combination through operations such as selection, crossover, and mutation, and perform multiple cyclic iterations. After multiple iterations, the algorithm will find one or more sets of parameter combinations that satisfy all the constraint conditions, and these combinations perform best in terms of the optimization objectives (minimum transmission coefficient and minimum mass). The finally selected optimal combined structural parameters are the parameter combinations of the breakwater floating body that have the minimum transmission coefficient and minimum mass while satisfying the constraint conditions, and will be used for the actual breakwater design to achieve the purpose of structural design optimization.

[0116] It should be explained that in the optimal design of the floating breakwater, it is unrealistic to calculate all the multi-variable and multi-parameter floating breakwaters through high-cost physical model tests or complex and time-consuming computational fluid dynamics CFD codes. At the same time, the variation laws of the damping coefficient, added mass coefficient, hydrostatic stiffness coefficient, and structural property parameters of the floating breakwater are not completely consistent. Therefore, this embodiment uses an optimization algorithm to solve the multi-objective optimization problem in the design of the floating breakwater. The goal is to minimize the transmission coefficient and the mass of the breakwater while satisfying certain constraint conditions. This method can improve the performance of the breakwater while reducing costs.

[0117] Specifically, the multi-objective optimization problem in this embodiment is described as follows:

[0118]

[0119] Among them, C d is the transmission coefficient, and M is the mass of the floating breakwater.

[0120] The constraint conditions are as follows:

[0121] Natural period constraint T heave ≥20s, indicating that the natural period of the heave motion of the floating body is at least 20s;

[0122] Natural period constraint T roll ≥25s, indicating that the natural period of the roll motion of the floating body is at least 25s;

[0123] Natural period constraint T pitch ≥25s, indicating that the natural period of the pitch motion of the floating body is at least 25s;

[0124] The purpose of the constraint conditions of the natural period is to ensure that the natural period of the breakwater floating body is far from the environmental period (such as the wave period) that may cause resonance, so as to avoid resonance in these motions and improve the stability of the structure.

[0125] Motion quantity constraint X surge ≤X surge,max, representing that the maximum amount of motion of the floating body's surge does not exceed a preset maximum value;

[0126] Motion constraint X heave ≤X heave,max , representing that the maximum amount of motion of the floating body's heave does not exceed a preset maximum value;

[0127] Motion constraint X pitch ≤X pitch,max , representing that the maximum amount of motion of the floating body's pitch does not exceed a preset maximum value.

[0128] The purpose of the motion constraint conditions is to limit the amount of motion of the breakwater floating body in various directions to prevent structural damage or failure caused by excessive motion.

[0129] The cable tension constraint condition is 5F cable ≤F cable，break , where break refers to the tension at which the cable breaks, and the cable tension constraint condition represents that the tension of the mooring cable does not exceed one-fifth of its breaking tension.

[0130] The purpose of the cable tension constraint condition is to ensure that the cable has sufficient safety margin during use and prevent the cable from breaking due to excessive tension. Among them, "5" is a safety factor, indicating that the actual allowable maximum tension is one-fifth of the cable breaking tension, thus providing additional safety protection.

[0131] The above constraint conditions cover the natural period, amount of motion of the breakwater floating body, and tension of the mooring cable, aiming to ensure the stability and safety of the floating structure under various working conditions. By meeting these constraint conditions, resonance can be avoided, the amount of motion can be controlled, and the safety of the cable can be guaranteed, thus realizing the optimal design of the floating structure.

[0132] Embodiment 3

[0133] This embodiment provides an electronic device. Figure 6 The structural block diagram of the electronic device according to an embodiment of the present invention is shown. As Figure 6 shown, the electronic device includes: a memory 100 and a processor 200. A computer program that can run on the processor 200 is stored in the memory 100. When the processor 200 executes the computer program, it implements the structural optimization method of the breakwater floating body in the above embodiment. The number of the memory 100 and the processor 200 can be one or more.

[0134] The electronic device further includes:

[0135] A communication interface 300, used for communicating with external devices and performing data interaction and transmission.

[0136] If the memory 100, the processor 200, and the communication interface 300 are implemented independently, the memory 100, the processor 200, and the communication interface 300 can be interconnected through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus can be divided into an address bus, a data bus, a control bus, and the like.

[0137] Optionally, in a specific implementation, if the memory 100, the processor 200, and the communication interface 300 are integrated on a single chip, the memory 100, the processor 200, and the communication interface 300 can communicate with each other through an internal interface.

[0138] An embodiment of the present invention provides a computer-readable storage medium storing a computer program, which when executed by a processor implements the method provided in the embodiment of the present invention.

[0139] An embodiment of the present invention further provides a chip, which includes a processor for calling and running instructions stored in a memory, so that a communication device installed with the chip executes the method provided in the embodiment of the present invention.

[0140] An embodiment of the present invention further provides a chip, including: an input interface, an output interface, a processor, and a memory. The input interface, the output interface, the processor, and the memory are connected through an internal connection path. The processor is configured to execute code in the memory, and when the code is executed, the processor is configured to execute the method provided in the embodiment of the invention.

[0141] It should be understood that the above-mentioned processor may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. It is worth noting that the processor may be a processor that supports the advanced RISC machines (ARM) architecture.

[0142] Further, optionally, the above-mentioned memory may include a read-only memory and a random access memory, and may also include a non-volatile random access memory. The memory may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may include a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may include a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available. For example, static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct rambus random access memory (DR RAM).

[0143] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions according to the present invention are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another.

[0144] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0145] Furthermore, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0146] As described above, the above are only the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various changes or substitutions, and these should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A breakwater floating body, characterized in that: include: A first buoy, fixed by mooring lines and floating in the ocean; A second floating body connected to the first floating body, wherein the surface of the second floating body is provided with openings and the interior is hollow, so that the second floating body is in communication with seawater; Damping components, multiple damping components are evenly distributed around the second floating body at equal intervals, and each of the damping components is connected to the surface of the second floating body through a connecting piece; each of the damping components is hollow inside and the upper and lower surfaces of the damping components are respectively provided with openings to suppress the vertical movement of seawater.

2. The breakwater floating body according to claim 1, characterized in that: A ballast space is provided in the first floating body, and a set amount of liquid is stored in the ballast space so that the immersion depth of the first floating body reaches a preset depth.

3. The breakwater floating body according to claim 1, characterized in that: The interior of the connecting member is hollow so that the damping component is connected with the interior of the second floating body through the connecting member to form a gap water channel.

4. The breakwater floating body according to claim 1, characterized in that: The opening on the second floating body is arranged on the bottom surface of the second floating body.

5. A method for optimizing the structure of a breakwater floating body according to any one of claims 1 to 4, characterized in that: include: Acquire actual sea condition data at the location of the breakwater floating body, input the actual sea condition data into a pre-established hydrodynamic model, and output motion characteristic parameters and environmental loads of the breakwater floating body, wherein the environmental loads include the force exerted by the tension of the mooring cable on the breakwater floating body; Determining the motion amplitude of the breakwater floating body under the load based on the floating body motion equation according to the motion characteristic parameters and the environmental load; The floating body structural parameters of the breakwater float are obtained, the floating body structural parameters are optimized based on a genetic algorithm, and the natural period of the breakwater float during movement, the movement amplitude and the mooring cable tension are used as constraints to determine the structural parameter combination that meets the preset optimization objectives as the optimal structural parameters of the breakwater float.

6. The structural optimization method of a breakwater floating body according to claim 5, characterized in that: The motion characteristic parameters include a structural mass matrix, a floating body additional mass matrix, a damping matrix, a viscous damping matrix, and a hydrostatic restoring force matrix.

7. The structural optimization method of a breakwater floating body according to claim 6, characterized in that: The determining of the motion amplitude of the breakwater floating body under the load based on the floating body motion equation according to the motion characteristic parameters and the environmental load comprises: The motion characteristic parameters and the environmental load are introduced into the motion equation of the floating body, the deformation of the breakwater floating body under the load is calculated, and the target displacement is obtained; The target displacement is converted into the motion amplitude which is a dimensionless number based on a preset transfer function.

8. The structural optimization method of a breakwater floating body according to claim 5, characterized in that: The optimal structural parameters are the floating body structural parameters with the minimum transmission coefficient and the minimum mass, and the floating body structural parameters include the height of the damping component in the breakwater floating body, the width of the damping component and the opening size of the damping component.

9. An electronic device, characterized in that: include: A processor and a memory, wherein the memory stores instructions, and the instructions are loaded and executed by the processor to implement the structural optimization method of a breakwater floating body as described in any one of claims 5 to 8.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for optimizing the structure of a breakwater floating body according to any one of claims 5 to 8 is implemented.

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