Improved design method and system for heat dissipation of a protective tube

Abstract

The application provides an improved design method and system for heat dissipation of a protective tube, acquires environmental load data based on a historical protective tube operation database, constructs a multi-physical field coupling simulation model, acquires temperature distribution characteristics of the protective tube under different environments, acquires stress distribution characteristics of the protective tube under different load combinations, acquires a plurality of different heat dissipation improvement design schemes of the protective tube and structural strength evaluation results of the protective tube, screens the plurality of different heat dissipation improvement design schemes of the protective tube, and obtains a heat dissipation improvement design result of the protective tube meeting preset protection requirements. The application solves the problem that the prior art only considers the opening heat dissipation design of the protective tube and lacks consideration of the performance decline of the protective tube structure, resulting in poor protection effect of the protective tube. The application realizes the design evaluation of multiple dimensions such as temperature and stress for the heat dissipation design of the protective tube, and improves the protection effect of the protective tube.

Description

Technical Field

[0001] The present invention relates to the field of submarine cable protection design, and in particular to a heat dissipation improvement design method and system for a protection tube. Background Art

[0002] Submarine cables connect offshore booster stations and onshore control centers. To improve operational reliability, protective tubes are required for the portion of the cable that rises from the seabed to the offshore booster station. Existing protective tubes are typically submarine cable J-tubes. These J-tubes are designed for safety, reliability, ease of maintenance, and durability, primarily focusing on cable protection and ensuring the J-tube's structural performance.

[0003] At present, the design of submarine cable J-tubes mainly adopts the attempt to open holes in the J-tube to achieve the purpose of optimizing the J-tube structural design and improving the heat dissipation conditions of the submarine cable inside the tube. However, the opening of the J-tube will inevitably cause the structural performance of the component itself to deteriorate, and it is possible that the J-tube structure will fail after the opening, thereby losing its protective effect on the submarine cable. In addition, there is also a technical study that proposes a current-carrying capacity evaluation model for submarine cables inside J-tubes based on finite element simulation. In COMSOL software, a geometric model is built based on a real operating scenario, material properties (thermal conductivity and density) are loaded, and boundary conditions (wind speed near the J-tube, solar radiation intensity and ambient temperature) are set to form a three-dimensional temperature field simulation model of the J-tube and submarine cable, so as to accurately solve the temperature of the submarine cable conductor inside the tube and thus carry out an evaluation of the current-carrying capacity of the submarine cable inside the tube. Therefore, the existing technical system lacks attention to the problem of the degradation of the J-tube structural performance after the opening of the J-tube, and cannot answer how to determine the improvement design scheme for the heat dissipation of the submarine cable J-tube to achieve the optimization of the overall performance of the submarine cable J-tube, that is, to maximize the current-carrying capacity of the submarine cable inside the J-tube while ensuring that the submarine cable J-tube has sufficient structural strength. Summary of the Invention

[0004] In order to solve the above problems, the present invention proposes a heat dissipation improvement design method and system for a protective tube, which realizes design evaluation of the heat dissipation design of the protective tube in multiple dimensions such as temperature and stress, thereby improving the protection effect of the protective tube.

[0005] To achieve the above objectives, an embodiment of the present invention provides a method for improving heat dissipation design of a protection tube, comprising:

[0006] Based on the historical protection pipe operation database, environmental load data is obtained; wherein the environmental load data includes: temperature field data, fluid field data and stress field data;

[0007] Based on the environmental load data, a multi-physics field coupling simulation model is constructed;

[0008] Based on the temperature field data, the fluid field data and the multi-physics field coupling simulation model, obtaining temperature distribution characteristics of the protection tube under different environments;

[0009] Based on a preset superposition algorithm, the stress field data, and the multi-physics field coupling simulation model, the stress distribution characteristics of the protective pipe under different load combination conditions are obtained;

[0010] Based on the temperature distribution characteristics of the protection tube under the different environments and the stress distribution characteristics of the protection tube under different load combination working conditions, several different protection tube heat dissipation improvement design schemes and protection tube structural strength assessment results are obtained;

[0011] Based on the protection tube structural strength assessment result, several different protection tube heat dissipation improvement design solutions are screened to obtain a protection tube heat dissipation improvement design result that meets the preset protection requirements.

[0012] An embodiment of the present invention proposes a method for improving the heat dissipation design of a protective tube. By obtaining environmental load data as basic data, fully considering temperature field data, fluid field data and stress field data, and then analyzing the coupling effect of multiple physical fields, the fluid data outside the protective tube can be introduced into the tube while ensuring that the protective tube has sufficient structural strength, thereby greatly improving the operating environment of the submarine cable in the tube and thus preventing overheating of the protective tube section. Finally, the heat dissipation design of the protective tube is evaluated and analyzed based on the temperature distribution characteristics of the protective tube under different environments and the stress distribution characteristics of the protective tube under different load combination working conditions. By analyzing the overall performance of the protective tube under different heat dissipation improvement design schemes, the optimal heat dissipation improvement design scheme for the protective tube that meets the transmission capacity requirements of the submarine cable system is finally determined, thereby realizing design evaluation of the heat dissipation design of the protective tube in multiple dimensions such as temperature and stress, and improving the protection effect of the protective tube.

[0013] Furthermore, based on the environmental load data, a multi-physics field coupling simulation model is constructed, specifically:

[0014] Based on the design parameters of the protection tube, a geometric model of the protection tube is constructed;

[0015] Based on the protection tube geometric model, the material properties of each layer structure of the protection tube geometric model are obtained through simulation model analysis;

[0016] Based on the environmental load data, the temperature field boundary conditions, fluid field boundary conditions, and stress field boundary conditions are set respectively; wherein the temperature field boundary conditions include: settings for heat source, convection heat dissipation coefficient, solar radiation intensity, and ambient temperature; the fluid field boundary conditions include: settings for flow velocity and pressure; and the stress field boundary conditions include: settings for wind load, wave load, ocean current load, and gravity load;

[0017] Based on the layer structure of the protective tube geometric model, material properties, temperature field boundary conditions, fluid field boundary conditions and stress field boundary conditions are set to construct a multi-physics field coupling simulation model.

[0018] Furthermore, based on the temperature field data, the fluid field data and the multi-physics field coupling simulation model, the temperature distribution characteristics of the protection tube under different environments are obtained, specifically:

[0019] inputting the temperature field data and the fluid field data into the multi-physics field coupling simulation model respectively to calculate the temperature distribution data of the protection tube;

[0020] Based on the protection tube temperature distribution data, protection tube temperature distribution characteristics under different environments are constructed.

[0021] Furthermore, based on the preset superposition algorithm, the stress field data and the multi-physics field coupling simulation model, the stress distribution characteristics of the protective pipe under different load combination conditions are obtained, specifically:

[0022] Based on the preset superposition algorithm, several superposition results are obtained by superimposing the maximum load value in the rotation stress field data with the load value of the residual stress field data;

[0023] Based on the several superposition results, construct load combination conditions;

[0024] The load combination working condition is input into the multi-physics field coupling simulation model to obtain the stress distribution characteristics of the protective pipe under different load combination working conditions.

[0025] Furthermore, based on the preset superposition algorithm, the maximum value of the load in the rotation stress field data is superimposed with the load value of the residual stress field data to obtain several superposition results, specifically:

[0026] Based on the stress field data, the maximum value of each load is obtained;

[0027] The maximum values ​​of each load and their corresponding residual stress field data load values ​​are superimposed using the Turkstra superposition algorithm to obtain several superposition results. The residual stress field data load value is specifically the value of all remaining loads obtained by excluding the load with the maximum value read in rotation in one superposition operation.

[0028] Furthermore, it also includes:

[0029] Obtain the mass matrix, damping matrix and stiffness matrix of the protective tube structure;

[0030] Calculate the mass damping coefficient and stiffness damping coefficient based on the first-order natural frequency and second-order natural frequency of the protection tube structure;

[0031] Constructing a Rayleigh damping coefficient based on the mass matrix, the damping matrix, the stiffness matrix, the mass damping coefficient, and the stiffness damping coefficient;

[0032] Based on the Rayleigh damping coefficient, the load combination working condition is input into the multi-physics field coupling simulation model to obtain the stress distribution characteristics of the protective pipe under different load combination working conditions.

[0033] Furthermore, based on the temperature distribution characteristics of the protection tube under different environments and the stress distribution characteristics of the protection tube under different load combination conditions, several different protection tube heat dissipation improvement design schemes and protection tube structural strength assessment results are obtained, specifically:

[0034] Based on the temperature distribution characteristics of the protection tube under the different environments, the key areas of concern for the heat dissipation improvement design of the protection tube are obtained;

[0035] By analyzing the key areas of concern for the heat dissipation improvement design of the protection tube, several different heat dissipation improvement design schemes for the protection tube are obtained;

[0036] Based on the stress distribution characteristics of the protective tube under the different load combination working conditions, the yield failure damage of the protective tube is determined to obtain the structural strength assessment result of the protective tube.

[0037] Furthermore, based on the protection tube structural strength assessment results, several different protection tube heat dissipation improvement design solutions are screened to obtain protection tube heat dissipation improvement design results that meet the preset protection requirements, specifically:

[0038] Based on the protection tube structural strength assessment result, the plurality of different protection tube heat dissipation improvement design schemes are verified to obtain structural strength verification results of the plurality of different protection tube heat dissipation improvement design schemes;

[0039] By screening the structural strength verification results of several different protection tube heat dissipation improvement design schemes, a protection tube heat dissipation improvement design result that meets the load increase demand and has the highest structural safety margin is obtained.

[0040] The embodiment of the present invention further provides a heat dissipation improvement design system for a protective tube, comprising: a data acquisition module, a model building module, a temperature distribution feature acquisition module, a stress distribution feature acquisition module, a design evaluation module, and a result screening module;

[0041] The data acquisition module is used to acquire environmental load data based on the historical protection pipe operation database; wherein the environmental load data includes: temperature field data, fluid field data and stress field data;

[0042] The model building module is used to build a multi-physics field coupling simulation model based on the environmental load data;

[0043] The temperature distribution characteristic acquisition module is used to acquire the temperature distribution characteristics of the protection tube under different environments based on the temperature field data, the fluid field data and the multi-physics field coupling simulation model;

[0044] The stress distribution characteristic acquisition module is used to obtain the stress distribution characteristics of the protective pipe under different load combination working conditions based on a preset superposition algorithm, the stress field data and the multi-physics field coupling simulation model;

[0045] The design evaluation module is used to obtain several different heat dissipation improvement design schemes for the protection tube and protection tube structural strength evaluation results based on the temperature distribution characteristics of the protection tube under the different environments and the stress distribution characteristics of the protection tube under different load combination working conditions;

[0046] The result screening module is used to screen the several different protection tube heat dissipation improvement design solutions based on the protection tube structural strength evaluation result, and obtain a protection tube heat dissipation improvement design result that meets the preset protection requirements.

[0047] An embodiment of the present invention proposes a heat dissipation improvement design system for a protective tube. The data acquisition module acquires environmental load data as basic data, fully considers temperature field data, fluid field data, and stress field data, and then analyzes the coupling effect of multiple physical fields through the model construction module, the temperature distribution feature acquisition module, and the stress distribution feature acquisition module. While ensuring that the protective tube has sufficient structural strength, the fluid data outside the protective tube can be introduced into the tube, greatly improving the operating environment of the submarine cable in the tube and thus preventing the overheating problem of the protective tube section. Finally, the design evaluation module and the result screening module are used to evaluate and analyze the heat dissipation design of the protective tube based on the temperature distribution characteristics of the protective tube under different environments and the stress distribution characteristics of the protective tube under different load combination working conditions. By analyzing the overall performance of the protective tube under different heat dissipation improvement design schemes, the optimal heat dissipation improvement design scheme for the protective tube that meets the transmission capacity requirements of the submarine cable system is finally determined, so that the heat dissipation design of the protective tube is evaluated in multiple dimensions such as temperature and stress, thereby improving the protection effect of the protective tube.

[0048] The model building module is used to build a multi-physics field coupling simulation model based on the environmental load data, and also includes:

[0049] Geometric model building unit, property analysis unit, condition setting unit and simulation model building unit;

[0050] The geometric model building unit is used to build a geometric model of the protection tube based on the design parameters of the protection tube;

[0051] The property analysis unit is used to obtain the material properties of each layer structure of the protection tube geometric model through simulation model analysis based on the protection tube geometric model;

[0052] The condition setting unit is used to set the temperature field boundary conditions, fluid field boundary conditions and stress field boundary conditions based on the environmental load data; wherein the temperature field boundary conditions include: settings for heat source, convection heat dissipation coefficient, solar radiation intensity and ambient temperature; the fluid field boundary conditions include: settings for flow velocity and pressure; the stress field boundary conditions include: settings for wind load, wave load, ocean current load and gravity load;

[0053] The simulation model construction unit is used to set material properties, temperature field boundary conditions, fluid field boundary conditions and stress field boundary conditions based on each layer structure of the protection tube geometric model to construct a multi-physics field coupling simulation model. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 A schematic flow chart of the steps of a method for improving heat dissipation design of a protection tube provided in one embodiment of the present invention;

[0055] Figure 2 A main view and simulation conditions of a multi-physics field coupling simulation model for a heat dissipation improvement design method for a protection tube provided in one embodiment of the present invention;

[0056] Figure 3 A top view and simulation conditions of a multi-physics field coupling simulation model of a heat dissipation improvement design method for a protection tube provided in one embodiment of the present invention;

[0057] Figure 4 A schematic diagram of temperature distribution of an improved heat dissipation design method for a protection tube provided by one embodiment of the present invention;

[0058] Figure 5 A schematic diagram of stress distribution of a heat dissipation improvement design method for a protection tube provided by one embodiment of the present invention;

[0059] Figure 6 A schematic diagram of the module structure of a heat dissipation improvement design system for a protection tube provided by one embodiment of the present invention;

[0060] Figure 7 A schematic diagram of the structure of a model building module of a heat dissipation improvement design system for a protection tube provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0061] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0062] Throughout its lifecycle, submarine cable J-tubes may experience various forms of damage, including external force damage caused by collisions during cable threading and installation; corrosion damage caused by high humidity, high salinity, and marine organism attachment; yield damage caused by localized stress concentration; and fatigue and resonance damage caused by long-term fluctuating loads. Improved J-tube designs must possess sufficient structural strength to withstand these various forms of damage throughout their designed operating life. Furthermore, due to the recent frequent occurrence of abnormal environmental events such as typhoons and earthquakes, structural strength verification under extreme environmental conditions must also be considered during the design of improved submarine cable J-tube structures. Existing technologies only propose that opening holes in the J-tube wall can improve the current-carrying capacity of the submarine cable within the tube and discuss the impact of J-tube wall hole parameters on the efficiency of improving the current-carrying capacity of the submarine cable within the tube. However, no recommended design solution for improving the heat dissipation of submarine cable J-tubes has yet been developed. Existing technologies lack consideration of the degradation of J-tube structural performance after opening holes in the J-tube, and therefore fail to address how to determine a design solution for improving the heat dissipation of the submarine cable J-tube to optimize its overall performance, namely, to maximize the current-carrying capacity of the submarine cable within the J-tube while ensuring sufficient structural strength. Therefore, it is necessary to propose an improved design method for the heat dissipation of the submarine cable J-tube based on the temperature-fluid-stress multi-physics field coupling analysis, which can solve the thermal bottleneck problem of the submarine cable J-tube section while ensuring that the submarine cable J-tube has sufficient structural strength, so as to achieve the benefit of improving the overall transmission capacity of the submarine cable delivery system of the offshore booster station without increasing the investment cost of the submarine cable.

[0063] Based on the above description, in this embodiment, a submarine cable J-tube is used as a protective tube to explain the heat dissipation improvement design method of a protective tube proposed by the present invention, which will not be repeated below.

[0064] Example 1

[0065] See also Figure 1 , Figure 1 A schematic flow chart of the steps of a heat dissipation improvement design method for a protection tube provided in one embodiment of the present invention. Figure 1 As shown, the embodiment of the present invention provides a method for improving heat dissipation design of a protection tube, including steps 101 to 106, each of which is specifically as follows:

[0066] Step 101: Acquire environmental load data based on a historical protection pipe operation database; wherein the environmental load data includes temperature field data, fluid field data, and stress field data;

[0067] As an example of the embodiment, the types of environmental loads faced by the submarine cable J tube during operation are determined, the calculation method of the values of various environmental loads is given, and the modeling method of the submarine cable J tube multi-environmental load combined model is proposed to determine the typical load combination conditions of the submarine cable J tube, which are used as input for the temperature-fluid-stress multi-physical field coupling simulation model.

[0068] The wind speed data corresponding to different heights of the submarine cable J tube part above sea level are collected, and the submarine cable J tube part above sea level is divided into n segments according to the wind speed interval. The value of n is selected according to the accuracy requirement of the wind load distribution calculation result. For each part of the divided submarine cable J tube, the wind load F w The calculation formula is as follows:

[0069] F w = K h K w a

[0070] K h a w vA

[0071] For the submarine cable J tube part below sea level, since its diameter is much smaller than its length, its wave load F h The calculation formula is as follows:

[0072]

[0073] K D K M D x v c The calculation formula is as follows:

[0074]

[0075] K c v c The calculation formula is as follows:

[0076] The above is the calculation formula of the stress field data. The temperature field and fluid field data can be obtained by existing means.

[0077] Step 102, based on the environmental load data, a multi-physical field coupling simulation model is constructed;

[0078] As an example of this embodiment, a geometric model of the protection tube is constructed based on the design parameters of the protection tube;

[0079] Based on the geometric model of the protective tube, the material properties of each layer of the geometric model of the protective tube are obtained through simulation model analysis; based on the environmental load data, the temperature field boundary conditions, fluid field boundary conditions and stress field boundary conditions are set respectively; wherein, the temperature field boundary conditions include: settings for heat source, convection heat dissipation coefficient, solar radiation intensity and ambient temperature; the fluid field boundary conditions include: settings for flow velocity and pressure; the stress field boundary conditions include: settings for wind load, wave load, current load and gravity load; based on the material properties, temperature field boundary conditions, fluid field boundary conditions and stress field boundary conditions of each layer of the geometric model of the protective tube, a multi-physics field coupling simulation model is constructed. A specific implementation method is to establish a temperature-fluid-stress multi-physics field coupling simulation model of the submarine cable J-tube section (including the J-tube and the submarine cable inside the tube) based on the different types of environmental loads obtained in step 101, and use the different environmental loads calculated by S1 as the simulation stress field input. The simulation model is used to analyze the hot spot temperature distribution characteristics of the submarine cable inside the J-tube under different operating scenarios, and propose a design idea for heat dissipation improvement of the submarine cable J-tube. See Figure 2 and Figure 3 , Figure 2 A main view and simulation conditions of a multi-physics field coupling simulation model for a heat dissipation improvement design method for a protection tube provided in one embodiment of the present invention; Figure 3 A top view and simulation conditions of a multi-physics field coupling simulation model of a heat dissipation improvement design method for a protection tube provided in a certain embodiment of the present invention; Figure 2 and Figure 3 As shown, a geometric model of the J-tube section of the submarine cable is built in the simulation software based on the design parameters of the J-tube and the structural parameters of the submarine cable. The material properties of each layer of the geometric model of the J-tube section of the submarine cable are set in the simulation software according to the real material parameters. Based on the actual operation of the J-tube section of the submarine cable, the temperature field, fluid field and stress field are added in the simulation software, and the boundary conditions of different physical fields are set respectively (the temperature field boundary conditions include the settings of the heat source, convection heat dissipation coefficient, solar radiation intensity and ambient temperature; the fluid field boundary conditions include the settings of the flow velocity and pressure; the stress field includes the settings of the wind load, wave load, current load and gravity load). Finally, a temperature-fluid-stress multi-physical field coupling simulation model of the J-tube section of the submarine cable is formed.

[0080] Step 103: obtaining temperature distribution characteristics of the protective tube under different environments based on the temperature field data, the fluid field data, and the multi-physics field coupling simulation model;

[0081] As an example of this embodiment, the temperature field data and the fluid field data are respectively input into the multi-physics field coupling simulation model to calculate the temperature distribution data of the protection tube; based on the temperature distribution data of the protection tube, the temperature distribution characteristics of the protection tube under different environments are constructed. For a specific possible implementation method, see Figure 4 , Figure 4 A schematic diagram of temperature distribution of a heat dissipation improvement design method for a protection tube provided in one embodiment of the present invention; Figure 4 As shown in the figure, the temperature-fluid-stress multi-physics field coupling simulation model is used to calculate the temperature distribution of the J-tube section of the submarine cable under different environmental conditions (wind speed, ambient temperature and solar radiation intensity). Based on the analysis of the temperature distribution characteristics of the hot spots of the conductor in the J-tube section of the submarine cable, the key focus areas of the improved heat dissipation design of the submarine cable J-tube are determined, and a method for evaluating the benefits of different improved heat dissipation design schemes of the submarine cable J-tube (different J-tube opening distributions and different aperture sizes) on improving the current-carrying capacity of the submarine cable J-tube section is proposed.

[0082] Step 104: obtaining stress distribution characteristics of the protective pipe under different load combination conditions based on a preset superposition algorithm, the stress field data, and the multi-physics field coupling simulation model;

[0083] As an example of this embodiment, based on a preset superposition algorithm, the maximum value of the load in the rotated stress field data is superimposed with the residual stress field data load value to obtain several superposition results; based on these several superposition results, a load combination working condition is constructed; these load combination working conditions are input into the multi-physics field coupling simulation model to obtain the stress distribution characteristics of the protective pipe under different load combination working conditions. Based on the stress field data, the maximum value of each load is obtained; using the Turkstra superposition algorithm, the maximum value of each load and its corresponding residual stress field data load value are superimposed to obtain several superposition results; wherein, the residual stress field data load value is specifically: in a superposition operation, the value of all remaining loads is obtained by eliminating the load whose maximum value is read in rotation. It also includes: obtaining the mass matrix, damping matrix and stiffness matrix of the protection tube structure; calculating the mass damping coefficient and stiffness damping coefficient based on the first-order natural frequency and second-order natural frequency of the protection tube structure; constructing the Rayleigh damping coefficient based on the mass matrix, damping matrix stiffness matrix, mass damping coefficient and stiffness damping coefficient; based on the Rayleigh damping coefficient, inputting the load combination working condition into the multi-physics field coupling simulation model to obtain the stress distribution characteristics of the protection tube under different load combination working conditions. For a specific implementation method, see Figure 5 , Figure 5 A schematic diagram of stress distribution of a heat dissipation improvement design method for a protection tube provided by a certain embodiment of the present invention; Figure 5As shown in the figure, based on historical monitoring data from offshore booster station wind speed sensors and J-tube seawater section stress sensors, gravity loads, wave loads, and current loads at different return periods, as well as wind loads at different typhoon levels, were determined. Following the Turkstra superposition principle, the maximum value of one load during the design reference period was alternately superimposed with the instantaneous values ​​of the other loads. Furthermore, the effects of offshore structural damping, including hydrodynamic damping, structural damping, and soil damping, were considered, and all these damping factors were accounted for by inputting the Rayleigh damping coefficient into the simulation.

[0084] C=x1A+x2B

[0085]

[0086] Where A, C, and B are the mass matrix, damping matrix, and stiffness matrix; x1 and x2 are the mass damping coefficient and stiffness damping coefficient; ξ is the damping ratio of the structure; f1 and f2 are the first and second order natural frequencies of the structure.

[0087] In view of the multiple environmental load combination scenarios that a submarine cable J-tube may face during operation, the typical load combination conditions of the submarine cable J-tube are determined based on the Turkstra superposition principle, which serves as the input for the structural performance evaluation of the submarine cable J-tube. The method for determining the typical load combination conditions of the submarine cable J-tube is as follows:

[0088] F1=maxF w (t)+F h (t * )+F c (t * )

[0089] F2=F w (t * )+maxF h (t)+F c (t * )

[0090] F3=F w (t * )+F h (t * )+maxF c (t)

[0091] Among them: F1, F2, F3 are three typical load combination conditions of submarine cable J tube, maxF i (t) is the maximum value of the i-th load, F i (t*) is the instantaneous value of the i-th load.

[0092] The combined working condition loads obtained by superposition are used as the input of the multi-physics field coupling simulation model of the submarine cable J-tube section to calculate the stress distribution of the submarine cable J-tube under different typical load combination working conditions. Then, the hot spot stress of the submarine cable J-tube is obtained through the simulation model calculation results in step 102 to determine whether the local structure of the submarine cable J-tube has yield failure under the most unfavorable load effect, thereby forming an evaluation method for the structural strength of the submarine cable J-tube under the most unfavorable load effect.

[0093] As another example of this embodiment, for the improved design method of submarine cable J-tube heat dissipation based on temperature-fluid-stress multi-physics field coupling analysis, in terms of using the Turkstra superposition principle to determine the typical load combination working conditions of the submarine cable J-tube, the JC superposition principle can be used instead of the Turkstra superposition principle, and the subsequent processing of this technical solution can also achieve the purpose of the invention; in analyzing different submarine cable J-tube heat dissipation improvement design schemes (for improving the current carrying capacity of the submarine cable J-tube section), the equivalent thermal path method can be used instead of the simulation analysis method, but the difficulty of solving the problem will be greatly increased, and the solution accuracy will be difficult to guarantee.

[0094] Step 105 , based on the temperature distribution characteristics of the protection tube under the different environments and the stress distribution characteristics of the protection tube under different load combination working conditions, obtain several different heat dissipation improvement design schemes for the protection tube and protection tube structural strength assessment results;

[0095] As an example of this embodiment, based on the temperature distribution characteristics of the protective tube under the different environments, the key areas of concern for the heat dissipation improvement design of the protective tube are obtained; by analyzing the key areas of concern for the heat dissipation improvement design of the protective tube, several different heat dissipation improvement design schemes for the protective tube are obtained; based on the stress distribution characteristics of the protective tube under the different load combination working conditions, the yield failure damage of the protective tube is determined, and the structural strength assessment result of the protective tube is obtained. A specific explanation is that step 103 combines the hotspot temperature obtained in step 104 to obtain the hotspot stress of the submarine cable J-tube, forming an assessment method for the structural strength of the submarine cable J-tube under the most unfavorable load effect. For submarine cable systems with different transmission capacity requirements, the current-carrying capacity improvement benefit assessment method for the submarine cable J-tube section, such as different J-tube opening distributions and different aperture sizes, proposed in steps 2 to 104, is used to determine different submarine cable J-tube heat dissipation improvement design schemes that can meet the submarine cable transmission capacity requirements.

[0096] Step 106 : Based on the protection tube structural strength evaluation result, the plurality of different protection tube heat dissipation improvement design solutions are screened to obtain a protection tube heat dissipation improvement design result that meets the preset protection requirements.

[0097] As an example of this embodiment, based on the structural strength assessment result of the protection tube, the several different protection tube heat dissipation improvement design schemes are verified to obtain the structural strength verification results of the several different protection tube heat dissipation improvement design schemes; by screening the structural strength verification results of the several different protection tube heat dissipation improvement design schemes, the protection tube heat dissipation improvement design result that meets the load increase demand and has the highest structural safety margin is obtained. A specific explanation is that by combining the J-tube section current carrying capacity improvement benefit assessment method in steps 102 to 104 and the J-tube structural strength assessment method in step 105, and using the submarine cable J-tube structural strength assessment method based on combined working condition loads proposed in step 105 to verify the structural strength of the J-tube under different heat dissipation improvement design schemes, the J-tube heat dissipation improvement design scheme with the highest structural safety margin under the premise of meeting the load increase demand of the submarine cable in the J-tube is determined, thereby realizing the dynamic capacity expansion of the J-tube under the premise of protecting the submarine cable.

[0098] The proposed method for improving the heat dissipation of submarine cable J-tubes improves the current-carrying capacity of the cable within the tube by optimizing the heat dissipation conditions within the tube. It also fully considers the impact of structural changes on the J-tube's own structural performance, ultimately achieving the goal of maximizing the current-carrying capacity of the cable within the J-tube while ensuring sufficient structural strength. A temperature-fluid-stress multi-physics field coupled simulation model for the J-tube section of the submarine cable is established. Based on the simulation model, methods for evaluating the benefits of improving the current-carrying capacity of the J-tube section and for evaluating the structural strength of the J-tube are proposed. The overall performance of the J-tube under different improved heat dissipation design schemes is analyzed, ultimately determining the optimal J-tube heat dissipation design scheme that meets the transmission capacity requirements of the submarine cable system.

[0099] An embodiment of the present invention proposes a method for improving the heat dissipation design of a protective tube. By obtaining environmental load data as basic data, fully considering temperature field data, fluid field data and stress field data, and then analyzing the coupling effect of multiple physical fields, the fluid data outside the protective tube can be introduced into the tube while ensuring that the protective tube has sufficient structural strength, thereby greatly improving the operating environment of the submarine cable in the tube and thus preventing overheating of the protective tube section. Finally, the heat dissipation design of the protective tube is evaluated and analyzed based on the temperature distribution characteristics of the protective tube under different environments and the stress distribution characteristics of the protective tube under different load combination working conditions. By analyzing the overall performance of the protective tube under different heat dissipation improvement design schemes, the optimal heat dissipation improvement design scheme for the protective tube that meets the transmission capacity requirements of the submarine cable system is finally determined, thereby realizing design evaluation of the heat dissipation design of the protective tube in multiple dimensions such as temperature and stress, and improving the protection effect of the protective tube.

[0100] Example 2

[0101] See also Figure 6 , Figure 6A schematic diagram of the module structure of a heat dissipation improvement design system for a protection tube provided by a certain embodiment of the present invention; Figure 6 As shown, an embodiment of the present invention provides a heat dissipation improvement design system for a protection tube, comprising: a data acquisition module 601, a model building module 602, a temperature distribution feature acquisition module 603, a stress distribution feature acquisition module 604, a design evaluation module 605, and a result screening module 606;

[0102] The data acquisition module 601 is used to acquire environmental load data based on the historical protection pipe operation database; wherein the environmental load data includes: temperature field data, fluid field data and stress field data;

[0103] The model building module 602 is used to build a multi-physics field coupling simulation model based on the environmental load data;

[0104] As an example of this embodiment, see Figure 7 , Figure 7 This is a schematic diagram of the model building module structure of a heat dissipation improvement design system for a protection tube provided by an embodiment of the present invention. Figure 7 As shown, the model building module 602 is used to build a multi-physics field coupling simulation model based on the environmental load data, and also includes:

[0105] A geometric model building unit 701, an attribute analysis unit 702, a condition setting unit 703 and a simulation model building unit 704;

[0106] The geometric model building unit 701 is used to build a geometric model of the protection tube based on the design parameters of the protection tube;

[0107] The property analysis unit 702 is used to obtain the material properties of each layer structure of the protection tube geometric model through simulation model analysis based on the protection tube geometric model;

[0108] The condition setting unit 703 is used to set the temperature field boundary conditions, fluid field boundary conditions and stress field boundary conditions based on the environmental load data; wherein the temperature field boundary conditions include: settings for heat source, convection heat dissipation coefficient, solar radiation intensity and ambient temperature; the fluid field boundary conditions include: settings for flow velocity and pressure; the stress field boundary conditions include: settings for wind load, wave load, ocean current load and gravity load;

[0109] The simulation model building unit 704 is used to set material properties, temperature field boundary conditions, fluid field boundary conditions and stress field boundary conditions based on each layer structure of the protection tube geometric model to build a multi-physics field coupling simulation model.

[0110] The temperature distribution characteristic acquisition module 603 is used to acquire the temperature distribution characteristics of the protection tube under different environments based on the temperature field data, the fluid field data and the multi-physics field coupling simulation model;

[0111] The stress distribution characteristic acquisition module 604 is used to obtain the stress distribution characteristics of the protective pipe under different load combination conditions based on a preset superposition algorithm, the stress field data and the multi-physics field coupling simulation model;

[0112] The design evaluation module 605 is used to obtain several different heat dissipation improvement design schemes for the protection tube and protection tube structural strength evaluation results based on the protection tube temperature distribution characteristics under the different environments and the protection tube stress distribution characteristics under different load combination working conditions;

[0113] The result screening module 606 is used to screen the several different protection tube heat dissipation improvement design solutions based on the protection tube structural strength assessment result, and obtain a protection tube heat dissipation improvement design result that meets the preset protection requirements.

[0114] An embodiment of the present invention proposes a heat dissipation improvement design system for a protective tube. The data acquisition module acquires environmental load data as basic data, fully considers temperature field data, fluid field data, and stress field data, and then analyzes the coupling effect of multiple physical fields through the model construction module, the temperature distribution feature acquisition module, and the stress distribution feature acquisition module. While ensuring that the protective tube has sufficient structural strength, the fluid data outside the protective tube can be introduced into the tube, greatly improving the operating environment of the submarine cable in the tube and thus preventing the overheating problem of the protective tube section. Finally, the design evaluation module and the result screening module are used to evaluate and analyze the heat dissipation design of the protective tube based on the temperature distribution characteristics of the protective tube under different environments and the stress distribution characteristics of the protective tube under different load combination working conditions. By analyzing the overall performance of the protective tube under different heat dissipation improvement design schemes, the optimal heat dissipation improvement design scheme for the protective tube that meets the transmission capacity requirements of the submarine cable system is finally determined, so that the heat dissipation design of the protective tube is evaluated in multiple dimensions such as temperature and stress, thereby improving the protection effect of the protective tube.

[0115] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

[0116] In the description of this specification, the reference terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and integrate different embodiments or examples described in this specification, as well as features of different embodiments or examples, unless they are mutually inconsistent.

[0117] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

Claims

1. A method for improving heat dissipation design of a protective tube, characterized in that: include: Based on the historical protection pipe operation database, environmental load data is obtained; wherein the environmental load data includes: temperature field data, fluid field data and stress field data; Based on the environmental load data, a multi-physics field coupling simulation model is constructed, specifically: based on the design parameters of the protection tube, a geometric model of the protection tube is constructed; based on the geometric model of the protection tube, material properties of each layer structure of the protection tube geometric model are obtained through simulation model analysis; based on the environmental load data, temperature field boundary conditions, fluid field boundary conditions and stress field boundary conditions are set respectively; wherein, the temperature field boundary conditions include: settings for heat source, convection heat dissipation coefficient, solar radiation intensity and ambient temperature; the fluid field boundary conditions include: settings for flow velocity and pressure; the stress field boundary conditions include: settings for wind load, wave load, ocean current load and gravity load; based on the material properties, temperature field boundary conditions, fluid field boundary conditions and stress field boundary conditions of each layer structure of the protection tube geometric model, a multi-physics field coupling simulation model is constructed; Based on the temperature field data, the fluid field data, and the multi-physics field coupling simulation model, obtaining temperature distribution characteristics of the protection tube under different environments, specifically: inputting the temperature field data and the fluid field data into the multi-physics field coupling simulation model respectively to calculate the temperature distribution data of the protection tube; and constructing the temperature distribution characteristics of the protection tube under different environments based on the temperature distribution data of the protection tube; Based on a preset superposition algorithm, the stress field data, and the multi-physics field coupling simulation model, the stress distribution characteristics of the protective pipe under different load combination conditions are obtained; Based on the temperature distribution characteristics of the protection tube under the different environments and the stress distribution characteristics of the protection tube under different load combination working conditions, several different protection tube heat dissipation improvement design schemes and protection tube structural strength assessment results are obtained; Based on the protection tube structural strength assessment result, several different protection tube heat dissipation improvement design solutions are screened to obtain a protection tube heat dissipation improvement design result that meets the preset protection requirements.

2. A heat dissipation improvement design method for a protective tube according to claim 1, characterized in that: Based on the preset superposition algorithm, the stress field data and the multi-physics field coupling simulation model, the stress distribution characteristics of the protective pipe under different load combination conditions are obtained, specifically: Based on the preset superposition algorithm, several superposition results are obtained by superimposing the maximum load value in the rotation stress field data with the load value of the residual stress field data; Based on the several superposition results, construct load combination conditions; The load combination working condition is input into the multi-physics field coupling simulation model to obtain the stress distribution characteristics of the protective pipe under different load combination working conditions.

3. A heat dissipation improvement design method for a protective tube according to claim 2, characterized in that: Based on the preset superposition algorithm, the maximum value of the load in the rotation stress field data is superimposed with the load value of the residual stress field data to obtain several superposition results, specifically: Based on the stress field data, the maximum value of each load is obtained; The maximum values ​​of each load and their corresponding residual stress field data load values ​​are superimposed using the Turkstra superposition algorithm to obtain several superposition results. The residual stress field data load value is specifically the value of all remaining loads obtained by excluding the load with the maximum value read in rotation in one superposition operation.

4. A heat dissipation improvement design method for a protection tube according to claim 2 or 3, characterized in that: Also includes: Obtain the mass matrix, damping matrix and stiffness matrix of the protective tube structure; Calculate the mass damping coefficient and stiffness damping coefficient based on the first-order natural frequency and second-order natural frequency of the protection tube structure; Constructing a Rayleigh damping coefficient based on the mass matrix, the damping matrix, the stiffness matrix, the mass damping coefficient, and the stiffness damping coefficient; Based on the Rayleigh damping coefficient, the load combination working condition is input into the multi-physics field coupling simulation model to obtain the stress distribution characteristics of the protective pipe under different load combination working conditions.

5. The heat dissipation improvement design method of a protection tube according to claim 1, characterized in that: Based on the temperature distribution characteristics of the protection tube under different environments and the stress distribution characteristics of the protection tube under different load combination conditions, several different protection tube heat dissipation improvement design schemes and protection tube structural strength assessment results are obtained, specifically: Based on the temperature distribution characteristics of the protection tube under the different environments, the key areas of concern for the heat dissipation improvement design of the protection tube are obtained; By analyzing the key areas of concern for the heat dissipation improvement design of the protection tube, several different heat dissipation improvement design schemes for the protection tube are obtained; Based on the stress distribution characteristics of the protective tube under the different load combination working conditions, the yield failure damage of the protective tube is determined to obtain the structural strength assessment result of the protective tube.

6. The heat dissipation improvement design method of a protection tube according to claim 1, characterized in that: Based on the protection tube structural strength assessment results, several different protection tube heat dissipation improvement design solutions were screened to obtain a protection tube heat dissipation improvement design result that meets the preset protection requirements, specifically: Based on the protection tube structural strength assessment result, the plurality of different protection tube heat dissipation improvement design schemes are verified to obtain structural strength verification results of the plurality of different protection tube heat dissipation improvement design schemes; By screening the structural strength verification results of several different protection tube heat dissipation improvement design schemes, a protection tube heat dissipation improvement design result that meets the load increase demand and has the highest structural safety margin is obtained.

7. A heat dissipation improvement design system for a protective tube, characterized in that: include: Data acquisition module, model building module, temperature distribution feature acquisition module, stress distribution feature acquisition module, design evaluation module and result screening module; The data acquisition module is used to acquire environmental load data based on the historical protection pipe operation database; wherein the environmental load data includes: temperature field data, fluid field data and stress field data; The model construction module is used to construct a multi-physics field coupling simulation model based on the environmental load data, and includes: a geometric model construction unit, a property analysis unit, a condition setting unit and a simulation model construction unit; the geometric model construction unit is used to construct a protective tube geometric model based on the design parameters of the protective tube; the property analysis unit is used to set material properties of each layer structure of the protective tube geometric model obtained through simulation model analysis based on the protective tube geometric model; the condition setting unit is used to set temperature field boundary conditions, fluid field boundary conditions and stress field boundary conditions respectively based on the environmental load data; wherein the temperature field boundary conditions include: settings for heat source, convection heat dissipation coefficient, solar radiation intensity and ambient temperature; the fluid field boundary conditions include: settings for flow velocity and pressure; the stress field boundary conditions include: settings for wind load, wave load, ocean current load and gravity load; the simulation model construction unit is used to set material properties, temperature field boundary conditions, fluid field boundary conditions and stress field boundary conditions based on each layer structure of the protective tube geometric model to construct a multi-physics field coupling simulation model; The temperature distribution feature acquisition module is used to acquire the temperature distribution features of the protection tube under different environments based on the temperature field data, the fluid field data, and the multi-physics field coupling simulation model. Specifically, the module inputs the temperature field data and the fluid field data into the multi-physics field coupling simulation model to calculate the temperature distribution data of the protection tube; and constructs the temperature distribution features of the protection tube under different environments based on the temperature distribution data of the protection tube. The stress distribution characteristic acquisition module is used to obtain the stress distribution characteristics of the protective pipe under different load combination conditions based on a preset superposition algorithm, the stress field data and the multi-physics field coupling simulation model; The design evaluation module is used to obtain several different heat dissipation improvement design schemes for the protection tube and protection tube structural strength evaluation results based on the protection tube temperature distribution characteristics under the different environments and the protection tube stress distribution characteristics under different load combination working conditions; The result screening module is used to screen the several different protection tube heat dissipation improvement design solutions based on the protection tube structural strength evaluation result, and obtain a protection tube heat dissipation improvement design result that meets the preset protection requirements.

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