Submarine cable optical fiber type selection method and system, terminal equipment and storage medium

Abstract

The invention discloses a submarine cable optical fiber type selection method and system, terminal equipment and a storage medium, and the method comprises the steps: firstly, employing a tension value and a pressure value of a connecting cable when an offshore power generation platform is located in a sea area as an excitation load of a cable three-dimensional model, and enabling the cable three-dimensional model to be more fit with an actual marine environment; then optical fiber simulation is carried out on optical fiber two-dimensional models with different fiber core numbers and different fiber core types, the fiber core number and the fiber core type of the optical fiber with the good transmission effect are determined, and the optical fiber position and the optical fiber sheath can be selected to adapt to the submarine environment. The optical fiber can be stably and efficiently transmitted in the seabed environment, and then the optical fiber excess length setting range is determined according to the calculated optical fiber excess length of the lower tension strain limit, the lower strain limit at the seabed high temperature and the upper strain limit at the seabed low temperature, so that the reasonable excess length range of the optical fiber in the strain range is ensured. The stability of the cable fiber in the seabed environment is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical fiber selection, and in particular to a submarine cable optical fiber selection method, system, terminal device and storage medium. BACKGROUND

[0002] With the continuous development of marine engineering and optical fiber technology, submarine cables are being used more and more widely, especially in the fields of marine communication, energy transmission, submarine monitoring, etc., and there are many different types of optical fibers on the market, such as single-mode optical fibers, multi-mode optical fibers, low-loss optical fibers, and pressure-resistant optical fibers. Different optical fiber materials and structures have different performance characteristics. As the key part of information transmission, the selection of optical fibers in submarine cables is crucial to the overall performance of the cable.

[0003] Currently, the selection of submarine cable optical fibers mainly relies on manual selection based on experience. This approach tends to overlook the impact of changes in the submarine environment on different materials and structures of cable optical fibers, which can lead to the inability of manually selected cable optical fibers to adapt to the submarine environment, resulting in low stability of submarine cable optical fibers and the inability to ensure stable and efficient transmission of submarine cable optical fibers. SUMMARY

[0004] The present application provides a submarine cable optical fiber selection method, system, terminal device and storage medium, which can solve the problem of the prior art that the selection of submarine cable optical fibers relies on experience and ignores the impact of changes in the submarine environment on different materials and structures of cable optical fibers, which can lead to the inability of manually selected cable optical fibers to adapt to the submarine environment, resulting in low stability of submarine cable optical fibers and the inability to ensure stable and efficient transmission of submarine cable optical fibers.

[0005] To solve the above technical problems, an embodiment of the present application provides a submarine cable optical fiber selection method, comprising:

[0006] Constructing a cable three-dimensional model under different optical fiber positions and different optical fiber sheath types, and constructing a cable strain curve and an optical fiber strain curve of each cable three-dimensional model according to the tension value and pressure value of the connected cable of the offshore power platform;

[0007] According to the optical fiber strain curve of the cable three-dimensional model, determining the maximum optical fiber strain force of each cable three-dimensional model; taking the cable three-dimensional model with a maximum optical fiber strain force less than a preset bearing value as a to-be-selected cable three-dimensional model; taking the optical fiber position and optical fiber sheath type corresponding to the to-be-selected cable three-dimensional model with the highest fitting degree of the cable strain curve and the optical fiber strain curve as the target optical fiber position and target optical fiber sheath type;

[0008] According to the material parameters of the optical fiber, a two-dimensional model of the optical fiber with different core numbers and different core types is constructed, and the attenuation, signal strength, sensing accuracy and spatial resolution of the optical fiber signal under different two-dimensional models of the optical fiber are calculated; according to the attenuation, signal strength, sensing accuracy and spatial resolution of each two-dimensional model of the optical fiber, the comprehensive score of each two-dimensional model of the optical fiber is calculated, and the core type and core number corresponding to the two-dimensional model of the optical fiber with the highest comprehensive score are taken as the target core type and target core number;

[0009] According to the tensile load, the seabed environmental temperature load and the material parameters of the optical fiber, the optical fiber excess length under the tensile strain lower limit, the seabed high temperature strain lower limit and the seabed low temperature strain upper limit is calculated; according to the tensile strain lower limit, the seabed high temperature strain lower limit and the seabed low temperature strain upper limit, the optical fiber excess length setting range is determined;

[0010] According to the target optical fiber position, the target optical fiber sheath type, the target core type, the target core number and the optical fiber excess length setting range, the final selection of the seabed cable optical fiber is determined.

[0011] Further, the cable strain curve and the optical fiber strain curve of each cable three-dimensional model are constructed according to the tensile value and the pressure value of the connected cable of the offshore power generation platform, comprising:

[0012] The tensile value sequence and the pressure value sequence of the connected cable of the offshore power generation platform under the current sea wave environment are obtained;

[0013] The tensile value sequence and the pressure value sequence of the connected cable of the offshore power generation platform are taken as the tensile load and the pressure load of each cable three-dimensional model, and the cable strain curve and the optical fiber strain curve of each cable three-dimensional model are constructed.

[0014] Further, the comprehensive score of each two-dimensional model of the optical fiber is calculated according to the attenuation, signal strength, sensing accuracy and spatial resolution of each two-dimensional model of the optical fiber, comprising:

[0015] The preset weight value is set for the attenuation, signal strength, sensing accuracy and spatial resolution of each two-dimensional model of the optical fiber respectively, and the attenuation, signal strength, sensing accuracy and spatial resolution of each two-dimensional model of the optical fiber with the preset weight value are obtained;

[0016] According to the attenuation, signal strength, sensing accuracy and spatial resolution of each two-dimensional model of the optical fiber with the preset weight value, the comprehensive score of each two-dimensional model of the optical fiber is calculated by the influence surface method.

[0017] Further, the optical fiber excess length under the tensile strain lower limit, the seabed high temperature strain lower limit and the seabed low temperature strain upper limit is calculated according to the tensile load, the seabed environmental temperature load and the material parameters of the optical fiber, comprising:

[0018] According to the tension load and the material parameters of the optical fiber, the optical fiber elongation under the lower limit of the tension strain is calculated by a tension-elongation calculation formula; wherein the tension-elongation calculation formula is: In the formula, F is the tension load; E i , S i are the Young's modulus and the cross-sectional area of the i th component of the optical unit respectively; ε is the optical fiber elongation; Δε 1 is the optical fiber strain value allowed under the tension load;

[0019] According to the temperature load of the seabed environment and the material parameters of the optical fiber, the optical fiber elongation under the lower limit of the strain at high seabed temperature and the upper limit of the strain at low seabed temperature is calculated by a temperature-elongation calculation formula; wherein the temperature-elongation calculation formula is: In the formula, ρ is the bending radius of the optical fiber; D is the diameter of the finite element unit of the optical fiber; d is the diameter of the optical fiber; n is the number of optical fibers; ε is the optical fiber elongation; Δε 2 is the optical fiber elongation change amount corresponding to the temperature of the seabed environment.

[0020] Further, the calculation formula of the optical fiber elongation change amount corresponding to the temperature of the seabed environment is:

[0021]

[0022] In the formula, Δε 2 is the optical fiber elongation change amount corresponding to the temperature of the seabed environment; ΔT is the temperature difference between the temperature of the seabed environment and the normal temperature of the seabed; E i , S i are the Young's modulus and the cross-sectional area of the i th component of the optical unit respectively; α i is the linear expansion coefficient of the i th component of the optical unit.

[0023] On the basis of the above-mentioned method embodiment, the present application correspondingly provides a system embodiment;

[0024] An embodiment of the present application provides a seabed cable optical fiber selection system, comprising: an optical fiber position and sheath type selection module, a fiber core type and fiber core number selection module, an optical fiber elongation range calculation module, and an optical fiber selection comprehensive module.

[0025] The optical fiber position and sheath type selection module is used to construct a cable three-dimensional model under different optical fiber positions and different optical fiber sheath types, construct a cable strain curve and an optical fiber strain curve of each cable three-dimensional model according to the tension value and the pressure value of the connected cable of the offshore power platform, determine the maximum optical fiber strain force of each cable three-dimensional model according to the optical fiber strain curve of the cable three-dimensional model, take the cable three-dimensional model with a maximum optical fiber strain force less than a preset bearing value as a to-be-selected cable three-dimensional model, and take the optical fiber position and the optical fiber sheath type corresponding to the to-be-selected cable three-dimensional model with the highest fitting degree of the cable strain curve and the optical fiber strain curve as the target optical fiber position and the target optical fiber sheath type.

[0026] The core type and core number selection module is configured to construct two-dimensional models of optical fibers with different core numbers and different core types according to material parameters of the optical fibers, and calculate attenuation, signal strength, sensing accuracy and spatial resolution of the optical fibers under different two-dimensional models of the optical fibers; calculate a comprehensive score of each two-dimensional model of the optical fibers according to the attenuation, signal strength, sensing accuracy and spatial resolution of each two-dimensional model of the optical fibers, and take the core type and core number corresponding to the two-dimensional model of the optical fibers with the highest comprehensive score as a target core type and a target core number;

[0027] The optical fiber excess length range calculation module is configured to calculate optical fiber excess lengths under a tensile strain lower limit, a strain lower limit at a high seabed temperature and a strain upper limit at a low seabed temperature according to the tensile load, the seabed environmental temperature load and the material parameters of the optical fiber, and determine an optical fiber excess length setting range according to the optical fiber excess lengths under the tensile strain lower limit, the strain lower limit at the high seabed temperature and the strain upper limit at the low seabed temperature.

[0028] The optical fiber selection comprehensive module is configured to determine the selection of the final seabed cable optical fiber according to the target optical fiber position, the target optical fiber sheath type, the target core type, the target core number and the optical fiber excess length setting range.

[0029] Further, before the optical fiber position and sheath type selection module, there is further a tensile force value and pressure value acquisition module.

[0030] The tensile force value and pressure value acquisition module is configured to acquire a tensile force value sequence and a pressure value sequence of a connected cable of a sea power generation platform under a current sea area wave environment, and take the tensile force value sequence and the pressure value sequence of the connected cable of the sea power generation platform as a tensile load and a pressure load of each cable three-dimensional model.

[0031] Further, the calculation of the optical fiber excess lengths under the tensile strain lower limit, the strain lower limit at the high seabed temperature and the strain upper limit at the low seabed temperature according to the tensile load, the seabed environmental temperature load and the material parameters of the optical fiber comprises:

[0032] The optical fiber excess length under the tensile strain lower limit is calculated by a tensile force-excess length calculation formula according to the tensile load and the material parameters of the optical fiber; wherein the tensile force-excess length calculation formula is: In the formula, F is the tensile load; E i , S i are Young's modulus and cross-sectional area of the i th member of the optical unit respectively; ε is the optical fiber excess length; Δε1 is an allowable optical fiber strain value under the tensile load;

[0033] According to the seabed environment temperature load and the material parameters of the optical fiber, the fiber residual length under the strain lower limit at high seabed temperature and the fiber residual length under the strain upper limit at low seabed temperature are calculated through a temperature-residual length calculation formula, wherein the temperature-residual length calculation formula is: In the formula, p is the bending radius of the optical fiber, D is the diameter of the finite element unit of the optical fiber, d is the diameter of the optical fiber, n is the number of the optical fiber, epsilon is the residual length of the optical fiber, and Delta epsilon 2 is the residual length change of the optical fiber corresponding to the seabed environment temperature.

[0034] On the basis of the above-mentioned method embodiment, the application correspondingly provides a terminal device embodiment, which comprises a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the method for selecting the optical fiber of the submarine cable as described in the application is realized.

[0035] On the basis of the above-mentioned method embodiment, the application correspondingly provides a computer readable storage medium embodiment, which comprises a stored computer program, and when the computer program runs, the device where the computer readable storage medium is located executes the method for selecting the optical fiber of the submarine cable as described in the application.

[0036] Compared with the prior art, the embodiment of the application has the following beneficial effects:

[0037] The present invention constructs cable three-dimensional models under different optical fiber positions and different optical fiber sheath types in terms of the selection of optical fiber positions and optical fiber sheath types, and constructs cable strain curves and optical fiber strain curves of each cable three-dimensional model according to the tension value and pressure value of the connected cable exerted by the offshore power generation platform. According to the optical fiber strain curve, the maximum optical fiber strain force of each cable three-dimensional model is determined, and the cable three-dimensional model with the maximum optical fiber strain force less than the preset bearing value is used as the cable three-dimensional model to be selected. The optical fiber position and optical fiber sheath type corresponding to the cable three-dimensional model to be selected with the highest degree of fitting between the cable strain curve and the optical fiber strain curve are further used as the target optical fiber position and target optical fiber sheath type, that is, by utilizing the offshore power generation platform in the sea area where it is located, When the tension and pressure values ​​of the connecting cable are used as the excitation load of the cable three-dimensional model, the cable three-dimensional model can be more in line with the actual marine environment, thereby improving the effect of optical fiber position and optical fiber sheath selection, and improving the stability of submarine cable optical fiber; for the selection of fiber core type and number of cores, two-dimensional optical fiber models with different numbers of cores and different core types are constructed, and the attenuation of optical fiber signals under different two-dimensional optical fiber models, signal strength, sensing accuracy and spatial resolution are calculated; the comprehensive score of each two-dimensional optical fiber model is calculated according to the attenuation, signal strength, sensing accuracy and spatial resolution of each two-dimensional optical fiber model, and the core type and number of cores corresponding to the two-dimensional optical fiber model with the highest comprehensive score are used as the target fiber. Core type and target number of cores, that is, by performing fiber simulation on a two-dimensional model of optical fibers with different numbers of cores and different core types, the number of cores and type of optical fibers with the best transmission effect are determined to ensure that the optical fiber can transmit stably and efficiently in the submarine environment; for the selection of the optical fiber excess length range, according to the tensile load, the submarine ambient temperature load and the material parameters of the optical fiber, the optical fiber excess length at the lower limit of tensile strain, the lower limit of strain at high submarine temperature and the upper limit of strain at low submarine temperature are calculated respectively. Based on the optical fiber excess length at the lower limit of tensile strain, the lower limit of strain at high submarine temperature and the upper limit of strain at low submarine temperature, the optical fiber excess length setting range is determined to ensure that the optical fiber has a reasonable excess length range within the strain range, thereby improving the stability of the cable optical fiber in the submarine environment; Finally, according to the target optical fiber position, target optical fiber sheath type, target optical fiber core type, target optical fiber core number and optical fiber excess length setting range, the final submarine cable optical fiber selection is determined, and the stability of the comprehensively selected submarine cable optical fiber on the seabed is improved, so that the submarine cable optical fiber can adapt to the submarine environment and ensure that the submarine cable optical fiber can be transmitted stably and efficiently in the submarine environment. This solves the problem that the existing technology relies on experience to select submarine cable optical fibers and ignores the influence of changing factors of the submarine environment on cable optical fibers of different materials and different structures, which easily leads to the inability of the cable optical fibers selected by artificial experience to adapt to the submarine environment, thereby resulting in low stability of the submarine cable optical fiber and inability to ensure stable and efficient transmission of the submarine cable optical fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A step flow chart of a submarine cable optical fiber selection method provided by an embodiment of the present application is provided.

[0039] Figure 2 A structural module diagram of a submarine cable optical fiber selection system provided by an embodiment of the present application is provided.

[0040] Figure 3 An optical fiber position type diagram provided by an embodiment of the present application. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0042] Embodiment 1:

[0043] Reference Figure 1 A step flow chart of a submarine cable optical fiber selection method provided by an embodiment of the present application is provided. The method at least includes the following steps:

[0044] Step S1: constructing a cable three-dimensional model under different optical fiber positions and different optical fiber sheath types, and constructing a cable strain curve and an optical fiber strain curve of each cable three-dimensional model according to a tension value and a pressure value of a connected cable of a sea power generation platform;

[0045] In the embodiment, the construction of the cable strain curve and the optical fiber strain curve of each cable three-dimensional model according to the tension value and the pressure value of the connected cable of the sea power generation platform includes:

[0046] obtaining a tension value sequence and a pressure value sequence of the connected cable of the sea power generation platform under a current sea wave environment;

[0047] In the embodiment, a tension sensor and a pressure sensor can be deployed on a connection layer between the sea power generation platform and the cable to collect the tension value sequence and the pressure value sequence of the connected cable of the sea power generation platform under the current sea wave environment, and the collected tension value sequence and pressure value sequence are used as an excitation load of each cable three-dimensional model.

[0048] The tension value sequence and the pressure value sequence of the connected cable of the sea power generation platform are used as a tension load and a pressure load of each cable three-dimensional model to construct a cable strain curve and an optical fiber strain curve of each cable three-dimensional model.

[0049] For example, a three-dimensional model of a three-core submarine cable with different optical fiber positions and different optical fiber sheath types is constructed using the finite element method, and a tensile force ranging from 10 kN to 500 kN and a pressure ranging from 1 MPa to 50 MPa are applied to one end of each cable three-dimensional model in ANSYS MECHANICAL to generate a cable strain curve and an optical fiber strain curve for each cable three-dimensional model; wherein the structure of the three-core submarine cable includes a metal conductor core, an optical fiber, an insulation layer, a filling layer, an armor layer, and an outer sheath.

[0050] Step S2: Determine the maximum optical fiber strain of each three-dimensional cable model based on the optical fiber strain curve of the three-dimensional cable model; select the three-dimensional cable model whose maximum optical fiber strain is less than the preset tolerance value as the three-dimensional cable model to be selected; and select the optical fiber position and optical fiber sheath type corresponding to the three-dimensional cable model to be selected whose cable strain curve has the highest degree of fit with the optical fiber strain curve as the target optical fiber position and target optical fiber sheath type;

[0051] In this embodiment, the cable strain curve and the optical fiber strain curve have the highest fitting degree, specifically: the ratio between the cable strain curve and the optical fiber strain curve is closest to 1.

[0052] In this embodiment, referring to FIG, which is a diagram of optical fiber position types provided in an embodiment of the present invention; Figure 3 (1) means that the optical fiber is located in the filling layer and is entangled with the metal core; Figure 3 (2) means that the optical fiber is located in the center of the filling layer and the metal guide core is wound around the optical fiber; Figure 3 (3) means the optical fiber is located in the armor layer.

[0053] In this embodiment, the optical fiber sheath types include but are not limited to steel wire sheath, lead alloy sheath and high-density polyethylene sheath.

[0054] Step S3: Based on the material parameters of the optical fiber, construct optical fiber two-dimensional models with different numbers of fiber cores and different fiber core types, and calculate the attenuation, signal strength, sensing accuracy, and spatial resolution of the optical fiber signal under the different optical fiber two-dimensional models; calculate a comprehensive score for each optical fiber two-dimensional model based on the attenuation, signal strength, sensing accuracy, and spatial resolution of each optical fiber two-dimensional model, and use the fiber core type and number of fiber cores corresponding to the optical fiber two-dimensional model with the highest comprehensive score as the target fiber core type and target fiber core number;

[0055] In this embodiment, the comprehensive score of each optical fiber two-dimensional model is calculated based on the attenuation, signal strength, sensing accuracy, and spatial resolution of each optical fiber two-dimensional model, including:

[0056] The preset weight values are set for the attenuation, signal strength, sensing accuracy and spatial resolution of each optical fiber two-dimensional model, to obtain the attenuation, signal strength, sensing accuracy and spatial resolution of each optical fiber two-dimensional model with preset weight values.

[0057] According to the attenuation, signal strength, sensing accuracy and spatial resolution of each optical fiber two-dimensional model with preset weight values, the comprehensive score of each optical fiber two-dimensional model is calculated by the influence surface method.

[0058] For example, when the core number is 12, 24 or 48 and the core type is single-mode optical fiber and multi-mode optical fiber, according to the material parameters of the optical fiber, optical fiber two-dimensional models with different core numbers and different core types are constructed, optical simulation is performed on each optical fiber two-dimensional model, the attenuation, signal strength, sensing accuracy and spatial resolution of each optical fiber two-dimensional model are calculated, and the attenuation, signal strength, sensing accuracy and spatial resolution of each optical fiber two-dimensional model are weighted. The attenuation, signal strength, sensing accuracy and spatial resolution of each optical fiber two-dimensional model after weight distribution are calculated by the influence surface method to calculate the comprehensive score of each optical fiber two-dimensional model. Finally, the core type and core number corresponding to the optical fiber two-dimensional model with the highest comprehensive score are taken as the target core type and target core number. The different core numbers and different core types of the optical fiber two-dimensional model are respectively an optical fiber two-dimensional model with a core number of 12 and a core type of single-mode optical fiber, an optical fiber two-dimensional model with a core number of 12 and a core type of multi-mode optical fiber, an optical fiber two-dimensional model with a core number of 24 and a core type of single-mode optical fiber, an optical fiber two-dimensional model with a core number of 24 and a core type of multi-mode optical fiber, an optical fiber two-dimensional model with a core number of 48 and a core type of single-mode optical fiber, and an optical fiber two-dimensional model with a core number of 48 and a core type of multi-mode optical fiber. The tool for optical simulation includes but is not limited to ANSYS Optics.

[0059] Step S4: According to the tensile load, the seabed environmental temperature load and the material parameters of the optical fiber, the optical fiber excess length under the tensile strain lower limit, the strain lower limit at high seabed temperature and the strain upper limit at low seabed temperature are calculated respectively. According to the optical fiber excess length under the tensile strain lower limit, the strain lower limit at high seabed temperature and the strain upper limit at low seabed temperature, the optical fiber excess length setting range is determined.

[0060] In this embodiment, the high temperature refers to the highest temperature of the summer sea surface layer of the sea area where the cable is located, and the low temperature refers to the average annual water temperature of the seabed area where the cable is laid. For example, when the sea area where the cable is located belongs to a tropical sea area, the highest temperature of the summer sea surface layer is 32 degrees Celsius, and 32 degrees Celsius is taken as the high temperature environment. The water temperature of the seabed area of this sea area is maintained at 2 degrees Celsius all year round, and 2 degrees Celsius is taken as the low temperature environment.

[0061] In the embodiment, the fiber slack is calculated according to the tensile load, the seabed environment temperature load and the material parameters of the fiber, and the fiber slack under the tensile strain lower limit, the fiber slack under the seabed high temperature and the fiber slack under the seabed low temperature are calculated respectively, and the method comprises the following steps:

[0062] The fiber slack under the tensile strain lower limit is calculated by a tensile strain lower limit slack calculation formula according to the tensile load and the material parameters of the fiber; wherein the tensile strain lower limit slack calculation formula is: In the formula, F is the tensile load; E i , S i are the Young's modulus and the cross-sectional area of the i th component of the optical unit respectively; ε is the fiber slack; Δε 1 is the allowable fiber strain value under the tensile load;

[0063] The fiber slack under the seabed high temperature and the fiber slack under the seabed low temperature are calculated by a temperature slack calculation formula according to the seabed environment temperature load and the material parameters of the fiber; wherein the temperature slack calculation formula is: In the formula, ρ is the fiber bending radius; D is the diameter of the fiber finite element unit; d is the fiber diameter; n is the number of fibers; ε is the fiber slack; Δε 2 is the fiber slack change corresponding to the seabed environment temperature, and the calculation formula of the fiber slack change corresponding to the seabed environment temperature is: Δε 2 is the fiber slack change corresponding to the seabed environment temperature; ΔT is the temperature difference between the seabed environment temperature and the seabed normal temperature; E i , S i are the Young's modulus and the cross-sectional area of the i th component of the optical unit respectively; α i is the linear expansion coefficient of the i th component of the optical unit.

[0064] In the embodiment, the seabed normal temperature is set to 20 degrees Celsius, and the specific seabed normal temperature can be set according to the location of the sea area.

[0065] Step S5: determining the final selection of the submarine cable optical fiber according to the target fiber position, the target fiber sheath type, the target fiber core type, the target fiber core number and the fiber slack setting range.

[0066] For example, when the target fiber position is located in the center of the filling layer and the metal core is wound around the fiber, the target fiber sheath type is a high-density polyethylene sheath, the target fiber core type is a multi-mode optical fiber, the target fiber core number is 12 and the fiber slack setting range is 10 meters to 20 meters, the final selection of the submarine cable optical fiber can be determined.

[0067] Embodiment 2:

[0068] Referring to Figure 2A structural module diagram of a submarine cable optical fiber selection system is provided for an embodiment of the present application; the system comprises at least the following modules: an optical fiber position and sheath type selection module, a core type and core number selection module, an optical fiber excess length range calculation module, and an optical fiber selection comprehensive module;

[0069] The optical fiber position and sheath type selection module is configured to construct a cable three-dimensional model under different optical fiber positions and different optical fiber sheath types, construct a cable strain curve and an optical fiber strain curve of each cable three-dimensional model according to a tension value and a pressure value of a connected cable of an offshore power generation platform, determine a maximum optical fiber strain force of each cable three-dimensional model according to the optical fiber strain curve of the cable three-dimensional model, select a cable three-dimensional model with a maximum optical fiber strain force less than a preset bearing value as a to-be-selected cable three-dimensional model, and select a to-be-selected cable three-dimensional model with a highest fitting degree between a cable strain curve and an optical fiber strain curve, and corresponding optical fiber positions and optical fiber sheath types as target optical fiber positions and target optical fiber sheath types.

[0070] The core type and core number selection module is configured to construct an optical fiber two-dimensional model with different core numbers and different core types according to material parameters of the optical fiber, calculate an attenuation, a signal strength, a sensing accuracy, and a spatial resolution of an optical fiber signal under different optical fiber two-dimensional models, calculate a comprehensive score of each optical fiber two-dimensional model according to the attenuation, the signal strength, the sensing accuracy, and the spatial resolution of each optical fiber two-dimensional model, and select a core type and a core number corresponding to an optical fiber two-dimensional model with a highest comprehensive score as target core type and target core number.

[0071] The optical fiber excess length range calculation module is configured to calculate optical fiber excess lengths of a tension strain lower limit, a seabed high-temperature strain lower limit, and a seabed low-temperature strain upper limit according to a tension load, a seabed environmental temperature load, and material parameters of the optical fiber, and determine an optical fiber excess length setting range according to the optical fiber excess lengths of the tension strain lower limit, the seabed high-temperature strain lower limit, and the seabed low-temperature strain upper limit.

[0072] The optical fiber selection comprehensive module is configured to determine a final selection of a submarine cable optical fiber according to the target optical fiber positions, the target optical fiber sheath types, the target core type, the target core number, and the optical fiber excess length setting range.

[0073] For example, when the optical fiber excess length of the tension strain lower limit is 10 meters, the optical fiber excess length of the seabed high-temperature strain lower limit is 20 meters, and the optical fiber excess length of the seabed low-temperature strain upper limit is 15 meters, the optical fiber excess length setting range is determined to be [10 meters, 20 meters].

[0074] In the embodiment, the optical fiber position and sheath type selection module further comprises a tension value and pressure value acquisition module.

[0075] The tension value and pressure value acquisition module is configured to acquire a tension value sequence and a pressure value sequence of the connected cable under the wave environment of the current sea area, and take the tension value sequence and the pressure value sequence of the connected cable as the tension load and the pressure load of the three-dimensional model of each cable.

[0076] In the embodiment, the fiber slack is calculated according to the tension load, the seabed environment temperature load and the material parameters of the fiber, and the fiber slack under the tension strain lower limit, the fiber slack under the seabed high temperature strain lower limit and the fiber slack under the seabed low temperature strain upper limit are calculated respectively.

[0077] The fiber slack under the tension strain lower limit is calculated according to the tension load and the material parameters of the fiber through a tension-slack calculation formula; wherein the tension-slack calculation formula is: In the formula, F is the tension load; E i , S i are the Young's modulus and the cross-sectional area of the i th member of the optical unit respectively; ε is the fiber slack; Δε 1 is the allowable fiber strain value under the tension load;

[0078] The fiber slack under the seabed high temperature strain lower limit and the fiber slack under the seabed low temperature strain upper limit are calculated according to the seabed environment temperature load and the material parameters of the fiber through a temperature-slack calculation formula; wherein the temperature-slack calculation formula is: In the formula, ρ is the fiber bending radius; D is the diameter of the finite element unit of the fiber; d is the fiber diameter; n is the number of fibers; ε is the fiber slack; Δε 2 is the fiber slack change amount corresponding to the seabed environment temperature.

[0079] On the basis of the above method embodiment, another embodiment is provided;

[0080] Another embodiment of the application provides a seabed cable fiber selection terminal device, which comprises a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, and the processor implements the seabed cable fiber selection method according to any one of the above method embodiments of the application when executing the computer program.

[0081] For example, the computer program can be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the application. The one or more modules / units can be a series of computer program instruction segments capable of completing a specific function, which are used to describe the execution process of the computer program in the seabed cable fiber selection terminal device.

[0082] The submarine cable optical fiber selection terminal device can be a desktop computer, a notebook computer, a palm computer, a cloud server, or the like. The submarine cable optical fiber selection terminal device can include, but is not limited to, a processor and a memory. Those skilled in the art can understand that the submarine cable optical fiber selection terminal device can also include an input / output device, a network access device, a bus, and the like.

[0083] The processor can be a central processing unit (CPU), and can also be another general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or another programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or the like. The general-purpose processor can be a microprocessor or any conventional processor, and the like. The processor is a control center of the submarine cable optical fiber selection terminal device, and is connected to various parts of the submarine cable optical fiber selection terminal device through various interfaces and lines.

[0084] The memory can be used to store the computer program and / or the module, and the processor can realize various functions of the submarine cable optical fiber selection terminal device by running or executing the computer program and / or the module stored in the memory, and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area. The program storage area can store an operating system, at least one application program required by a function (such as a sound playing function, an image playing function, or the like), and the like; and the data storage area can store data created according to the use of the mobile phone (such as audio data, a phone book, or the like), and the like. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or another volatile solid-state memory device.

[0085] On the basis of the above-mentioned method embodiment, another embodiment is provided;

[0086] Another embodiment of the present application provides a storage medium comprising a stored computer program, wherein the computer program, when executed, controls a device in which the storage medium is located to perform the method of any one of the above embodiments of the present application.

[0087] The storage medium is a computer-readable storage medium, and the module / unit of the submarine cable fiber selection system / terminal device, if realized in the form of a software function unit and sold or used as an independent product, can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above-mentioned embodiments of the method of the present application can also be completed by a computer program instructing related hardware, and the computer program can be stored in a computer-readable storage medium. The computer program can be executed by a processor to implement the steps of each method embodiment described above. The computer program includes computer program code, which can be in the form of source code, object code, an executable file, or some intermediate form. The computer-readable medium can include any entity or device capable of carrying the computer program code, a recording medium, a U disk, a mobile hard disk, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0088] It should be noted that the terminal device can include, but is not limited to, a processor and a memory. Those skilled in the art can understand that the terminal device is merely an example and does not limit the terminal device, and can include more or fewer components, or combine certain components, or different components.

[0089] The above specific embodiments further illustrate the purpose, technical solutions, and advantages of the present application. It should be understood that the above description is only a specific embodiment of the present application and does not limit the protection scope of the present application. It is particularly pointed out that any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for selecting submarine cable optical fibers, characterized in that: include: Construct 3D cable models with different fiber positions and different fiber sheath types. Based on the tension and pressure values ​​of the connected cables exerted by the offshore power generation platform, construct cable strain curves and fiber strain curves for each 3D cable model. Determine the maximum optical fiber strain force of each three-dimensional cable model based on the optical fiber strain curve of the three-dimensional cable model; The three-dimensional cable model with the maximum optical fiber strain less than the preset tolerance value is used as the three-dimensional cable model to be selected; The optical fiber position and optical fiber sheath type corresponding to the selected three-dimensional cable model with the highest degree of fit between the cable strain curve and the optical fiber strain curve are used as the target optical fiber position and target optical fiber sheath type; Based on the material parameters of the optical fiber, two-dimensional optical fiber models with different numbers of fiber cores and different core types are constructed, and the attenuation, signal strength, sensing accuracy, and spatial resolution of the optical fiber signal under different two-dimensional optical fiber models are calculated. A comprehensive score is calculated for each two-dimensional optical fiber model based on its attenuation, signal strength, sensing accuracy, and spatial resolution. The core type and number of cores corresponding to the two-dimensional optical fiber model with the highest comprehensive score are used as the target core type and target number of cores. According to the tensile load, the seabed ambient temperature load and the material parameters of the optical fiber, the optical fiber excess length at the lower limit of tensile strain, the lower limit of strain at high seabed temperature and the upper limit of strain at low seabed temperature are calculated respectively; according to the calculated optical fiber excess length at the lower limit of tensile strain, the lower limit of strain at high seabed temperature and the upper limit of strain at low seabed temperature, the setting range of the optical fiber excess length is determined; The final submarine cable optical fiber selection is determined based on the target optical fiber position, target optical fiber sheath type, target optical fiber core type, target optical fiber core number, and optical fiber excess length setting range.

2. The method for selecting submarine cable optical fibers according to claim 1, wherein: The method of constructing a cable strain curve and an optical fiber strain curve of each cable three-dimensional model according to the tension and pressure values ​​of the connected cables exerted by the offshore power generation platform includes: Obtain the tension value sequence and pressure value sequence of the offshore power generation platform on the connected cables under the current sea wave environment; The tensile force and pressure value sequences of the offshore power generation platform on the connected cables are used as the tensile load and pressure load of each cable three-dimensional model, and the cable strain curve and optical fiber strain curve of each cable three-dimensional model are constructed.

3. The method for selecting submarine cable optical fibers according to claim 2, wherein: The comprehensive score of each optical fiber two-dimensional model is calculated based on the attenuation, signal strength, sensing accuracy and spatial resolution of each optical fiber two-dimensional model, including: For the attenuation, signal strength, sensing accuracy and spatial resolution of each optical fiber two-dimensional model, preset weight values ​​are set respectively to obtain the attenuation, signal strength, sensing accuracy and spatial resolution of each optical fiber two-dimensional model with the preset weight values; The comprehensive score of each optical fiber two-dimensional model is calculated using the influence surface method based on the attenuation, signal strength, sensing accuracy and spatial resolution of each optical fiber two-dimensional model with preset weight values.

4. The method for selecting submarine cable optical fibers according to claim 3, wherein: The method of calculating the optical fiber excess length at the lower limit of tensile strain, the lower limit of strain at high seabed temperature, and the upper limit of strain at low seabed temperature based on the tensile load, the seabed ambient temperature load, and the material parameters of the optical fiber, respectively, includes: According to the tensile load and the material parameters of the optical fiber, the optical fiber excess length at the lower limit of the tensile strain is calculated using the tension-excess length calculation formula; wherein the tension-excess length calculation formula is: Where F is the tensile load; E i 、S i are the Young's modulus and cross-sectional area of ​​the i-th component of the optical unit respectively; ε is the excess length of the optical fiber; Δε1 is the allowable strain value of the optical fiber under tensile load; According to the seabed ambient temperature load and the material parameters of the optical fiber, the optical fiber excess length at the lower strain limit at high seabed temperature and the upper strain limit at low seabed temperature are calculated respectively using the temperature-excess length calculation formula; wherein, the temperature-excess length calculation formula is: Where ρ is the fiber bending radius; D is the fiber finite element unit diameter; d is the fiber diameter; n is the number of fibers; ε is the fiber excess length; and Δε2 is the change in fiber excess length corresponding to the seabed ambient temperature.

5. The method for selecting submarine cable optical fibers according to claim 4, wherein: The calculation formula for the change in excess length of the optical fiber corresponding to the seabed ambient temperature is: Among them, Δε2 is the change in the optical fiber excess length corresponding to the seabed ambient temperature; ΔT is the temperature difference between the seabed ambient temperature and the normal seabed temperature; E i 、S i are the Young's modulus and cross-sectional area of ​​the i-th component of the optical unit respectively; α i is the linear expansion coefficient of the i-th component of the optical unit.

6. A submarine cable optical fiber selection system, characterized in that: include: Fiber position and sheath type selection module, fiber core type and core number selection module, fiber excess length range calculation module, and fiber selection comprehensive module; The fiber position and sheath type selection module is used to construct cable three-dimensional models under different fiber positions and different fiber sheath types, and to construct cable strain curves and fiber strain curves of each cable three-dimensional model according to the tension and pressure values ​​of the connected cables exerted by the offshore power generation platform; Determine the maximum optical fiber strain force of each three-dimensional cable model based on the optical fiber strain curve of the three-dimensional cable model; The three-dimensional cable model with the maximum optical fiber strain less than the preset tolerance value is used as the three-dimensional cable model to be selected; The optical fiber position and optical fiber sheath type corresponding to the selected three-dimensional cable model with the highest degree of fit between the cable strain curve and the optical fiber strain curve are used as the target optical fiber position and target optical fiber sheath type; The fiber core type and fiber core number selection module is used to construct two-dimensional fiber models with different numbers of fiber cores and different fiber core types based on the material parameters of the optical fiber, and calculate the attenuation, signal strength, sensing accuracy and spatial resolution of the optical fiber signal under different two-dimensional fiber models; calculate the comprehensive score of each two-dimensional fiber model based on the attenuation, signal strength, sensing accuracy and spatial resolution of each two-dimensional fiber model, and use the fiber core type and fiber core number corresponding to the two-dimensional fiber model with the highest comprehensive score as the target fiber core type and target fiber core number; The optical fiber excess length range calculation module is used to calculate the optical fiber excess length at the lower limit of tension strain, the lower limit of strain at high seabed temperature, and the upper limit of strain at low seabed temperature, respectively, based on the tension load, the seabed ambient temperature load, and the material parameters of the optical fiber; and determine the optical fiber excess length setting range based on the calculated optical fiber excess length at the lower limit of tension strain, the lower limit of strain at high seabed temperature, and the upper limit of strain at low seabed temperature; The optical fiber selection comprehensive module is used to determine the final submarine cable optical fiber selection according to the target optical fiber position, target optical fiber sheath type, target fiber core type, target fiber core number and optical fiber excess length setting range.

7. A submarine cable optical fiber selection system according to claim 6, characterized in that: Before the fiber position and sheath type selection module, it also includes: tension value and pressure value acquisition module; The tension value and pressure value acquisition module is used to obtain the tension value sequence and pressure value sequence of the offshore power generation platform on the connected cables under the current sea wave environment, and use the tension value sequence and pressure value sequence of the offshore power generation platform on the connected cables as the tension load and pressure load of each cable three-dimensional model.

8. The submarine cable optical fiber selection system according to claim 7, characterized in that: The method of calculating the optical fiber excess length at the lower limit of tensile strain, the lower limit of strain at high seabed temperature, and the upper limit of strain at low seabed temperature based on the tensile load, the seabed ambient temperature load, and the material parameters of the optical fiber, respectively, includes: According to the tensile load and the material parameters of the optical fiber, the optical fiber excess length at the lower limit of the tensile strain is calculated using the tension-excess length calculation formula; wherein the tension-excess length calculation formula is: Where F is the tensile load; E i 、S i are the Young's modulus and cross-sectional area of ​​the i-th component of the optical unit respectively; ε is the excess length of the optical fiber; Δε1 is the allowable strain value of the optical fiber under tensile load; According to the seabed ambient temperature load and the material parameters of the optical fiber, the optical fiber excess length at the lower strain limit at high seabed temperature and the upper strain limit at low seabed temperature are calculated respectively using the temperature-excess length calculation formula; wherein, the temperature-excess length calculation formula is: Where ρ is the fiber bending radius; D is the fiber finite element unit diameter; d is the fiber diameter; n is the number of fibers; ε is the fiber excess length; and Δε2 is the change in fiber excess length corresponding to the seabed ambient temperature.

9. A submarine cable optical fiber selection terminal device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, it implements a submarine cable optical fiber selection method according to any one of claims 1 to 5.

10. A storage medium, characterized in that: The storage medium includes a stored computer program, wherein when the computer program is executed, the device where the storage medium is located is controlled to execute the method for selecting submarine cable optical fibers according to any one of claims 1 to 5.

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