Cable terminal part construction method, device and equipment and readable storage medium

Abstract

The invention provides a cable terminal component construction method, device and equipment and a storage medium, and relates to the field of cable terminal design, and the method comprises the steps: obtaining construction parameters of a thick-wall cylinder model corresponding to a cable terminal, determining an equilibrium equation, a geometric equation, a constitutive equation and a boundary condition equation of the thick-wall cylinder model corresponding to the cable terminal based on the construction parameters, and determining a pressure parameter of the cable terminal and a radius parameter corresponding to the cable terminal; and constructing an epoxy sleeve and a stress cone support based on the pressure parameter of the cable terminal, the radius parameter corresponding to the cable terminal, and the equilibrium equation, the geometric equation, the constitutive equation and the boundary condition equation of the thick-wall cylinder model corresponding to the cable terminal. According to the stress cone, the factors of local deformation of the stress cone are considered, and the epoxy sleeve and the stress cone support are redesigned, so that the phenomenon that the local stress is concentrated due to the fact that the interface pressure between the contact surfaces becomes nonuniform due to the fact that the stress cone is locally deformed greatly is avoided.

Description

Technical Field

[0001] The present invention relates to the field of cable terminal design, and more particularly, to a method, device, equipment and storage medium for constructing cable terminal components. Background Art

[0002] As an important component in the power system, the main function of the cable terminal is to connect the cable to external equipment to ensure the safe and stable operation of the power system. At the same time, the cable terminal is also a weak link in the power system. According to statistics, about 70% of the early failures of cable systems originate from the failures at the interface between cable components and the cable body. Currently, the mainstream form of cable components is prefabricated cable components, including integral prefabricated and composite prefabricated. Among them, the composite prefabricated cable terminal mainly consists of multiple prefabricated components such as the cable body, stress cone, epoxy sleeve, and cone support. During the actual installation of the composite cable terminal, each prefabricated component is installed according to a certain order and process. The interface pressure between the stress cone and the cable body mainly comes from the interference fit between the stress cone and the cable and the axial force compensated by the spring at the lower part of the cone support. However, the design and production of each prefabricated component of the existing composite cable terminal are carried out under ideal conditions. The dimensions of the surrounding prefabricated components are designed and produced using the non-expanded dimensions of the stress cone, assuming that the prefabricated components fit tightly together.

[0003] However, due to the non-linear deformation of the stress cone during expansion, the axial dimension of the stress cone becomes shorter, and the radial deformation amounts of different parts of the stress cone are also different. During the actual installation process, the situation where the prefabricated components do not match may occur, that is, the outer side of the stress cone and the epoxy sleeve, and the stress cone and the cone support cannot fit tightly. When the spring compensates the axial force at the lower part of the cone support, the stress cone undergoes large deformation. During the process of converting the spring external force into rubber internal stress and finally acting on each interface through the stress cone to generate interface pressure, the stress cone is locally deformed greatly, which in turn makes the interface pressure between the contact surfaces uneven and local stress concentration occurs. Especially under complex working conditions such as high voltage or high temperature, excessive local stress will accelerate the damage or aging of the cable terminal. Summary of the Invention

[0004] The purpose of the present invention is to provide a method, device, equipment and storage medium for constructing cable terminal components, which can solve the problems caused by the non-linear deformation of the stress cone in the design of the composite cable terminal, and thus avoid the damage of the cable terminal.

[0005] In order to achieve the above purpose, the technical solutions adopted in the embodiments of the present application are as follows: In a first aspect, the embodiments of the present application provide a method for constructing cable terminal components, the method including: Obtain the construction parameters of the thick-walled cylinder model corresponding to the cable terminal, and determine the equilibrium equation, geometric equation, constitutive equation, and boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal based on the construction parameters; Determine the pressure parameter of the cable terminal and the radius parameters corresponding to the cable terminal. Among them, the cable terminal includes a stress cone, and the radius parameters corresponding to the cable terminal include the inner radius before the stress cone expansion, the inner radius after the stress cone expansion, and the outer radius before the expansion of the cable terminal; Based on the pressure parameter of the cable terminal, the radius parameters corresponding to the cable terminal, the equilibrium equation, geometric equation, constitutive equation, and boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal, obtain the expression of the outer radius after the expansion of the cable terminal and the expression of the axial strain; Based on the radius parameters corresponding to the components of the cable terminal, the expression of the axial strain, and the expression of the outer radius after the expansion of the cable terminal, perform finite element structural analysis to obtain the dimensional analysis results of the epoxy sleeve and the stress cone support corresponding to the cable terminal; Construct the epoxy sleeve and the stress cone support based on the dimensional analysis results of the epoxy sleeve and the stress cone support.

[0006] In an alternative embodiment, the step of obtaining the expression of the outer radius after the expansion of the cable terminal and the expression of the axial strain based on the pressure parameter of the cable terminal, the radius parameters corresponding to the cable terminal, the equilibrium equation, geometric equation, constitutive equation, and boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal includes: Analyze the equilibrium equation, geometric equation, boundary condition equation, and constitutive equation based on the pressure parameter to obtain the similarity equation corresponding to the constitutive equation; Based on the radius parameter and the similarity equation corresponding to the constitutive equation, obtain the expression of the axial strain; Based on the geometric equation and the similarity equation corresponding to the constitutive equation, obtain the expression of the outer radius after the expansion of the cable terminal.

[0007] In an alternative embodiment, the step of performing finite element structural analysis based on the radius parameters corresponding to the components of the cable terminal, the expression of the axial strain, and the expression of the outer radius after the expansion of the cable terminal to obtain the dimensional analysis results of the epoxy sleeve and the stress cone support corresponding to the cable terminal includes: Determine the radius parameters of each part of the components of the cable terminal; Based on the expression of the outer radius after the expansion of the cable terminal and the radius parameters of each part of the components of the cable terminal, obtain the outer radius after the expansion at each part of the cable terminal; For the outer radius after expansion of each cable terminal, based on the outer radius after expansion of the cable terminal, the radius parameter corresponding to the component of the cable terminal corresponding to the outer radius after expansion of the cable terminal, and the expression of the axial strain, determine the axial strain corresponding to the outer radius after expansion of the cable terminal, where there is a corresponding relationship among the outer radius after expansion of the cable terminal, the radius parameter corresponding to the component of the cable terminal, and the axial strain; Based on the outer radius after expansion of each cable terminal, the radius parameter corresponding to the component of the cable terminal corresponding to the outer radius after expansion of the cable terminal, and the axial strain corresponding to the outer radius after expansion of the cable terminal, perform finite element structural analysis to obtain the dimensional analysis results of the epoxy sleeve and the stress cone support corresponding to the cable terminal.

[0008] In an alternative embodiment, the step of analyzing the equilibrium equation, geometric equation, boundary condition equation, and constitutive equation based on the pressure parameter to obtain the similarity equation corresponding to the constitutive equation includes: Based on the constitutive equation, geometric equation, and equilibrium equation, obtain the similarity formula corresponding to the first construction parameter, where the first construction parameter includes the radial displacement, radial stress, tangential stress, and axial stress; Based on the pressure parameter of the cable terminal and the boundary condition equation, obtain the similarity equation corresponding to the boundary condition equation; Based on the similarity formula corresponding to the first construction parameter, the similarity equation corresponding to the boundary condition equation, and the constitutive equation, obtain the similarity formula corresponding to the second construction parameter, where the second construction parameter includes the radial strain, tangential strain, and axial strain; Take the similarity formula corresponding to the first construction parameter and the similarity formula corresponding to the second construction parameter as the similarity equation corresponding to the constitutive equation.

[0009] In an alternative embodiment, the step of obtaining the expression of the axial strain based on the radius parameter and the similarity equation corresponding to the constitutive equation includes: Obtain the similarity expression of the axial strain from the similarity formula corresponding to the second construction parameter; Based on the radius parameter and the similarity expression of the axial strain, obtain the expression of the axial strain.

[0010] In an alternative embodiment, the expression of the axial strain satisfies the following formula: ; where is the axial strain, is the inner radius before expansion of the stress cone, is the outer radius before expansion of the cable terminal, ` is the outer radius after the expansion of the cable terminal, E is the elastic modulus, and p is the internal pressure applied to the cable terminal in the pressure parameter.

[0011] In an alternative embodiment, the expression of the outer radius after the expansion of the cable terminal satisfies the following formula: ; ; Wherein, is the inner radius before the expansion of the stress cone, is the outer radius before the expansion of the cable terminal, ` is the outer radius after the expansion of the cable terminal, ` is the inner radius after the expansion of the stress cone.

[0012] In a second aspect, an embodiment of the present application provides a device for constructing a cable terminal component, the device includes: An acquisition module, configured to acquire construction parameters of a thick-walled cylinder model corresponding to the cable terminal, and determine an equilibrium equation, a geometric equation, a constitutive equation, and a boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal based on the construction parameters; A determination module, configured to determine the pressure parameter of the cable terminal and the radius parameters corresponding to the cable terminal, wherein the cable terminal includes a stress cone, and the radius parameters corresponding to the cable terminal include the inner radius before the expansion of the stress cone, the inner radius after the expansion of the stress cone, and the outer radius before the expansion of the cable terminal; based on the pressure parameter of the cable terminal, the radius parameters corresponding to the cable terminal, the equilibrium equation, the geometric equation, the constitutive equation, and the boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal, obtain an expression of the outer radius after the expansion of the cable terminal and an expression of the axial strain; based on the radius parameters corresponding to the components of the cable terminal, the expression of the axial strain, and the expression of the outer radius after the expansion of the cable terminal, perform finite element structural analysis to obtain a dimensional analysis result of the epoxy sleeve and the stress cone support corresponding to the cable terminal; A construction module, configured to construct an epoxy sleeve and a stress cone support based on the dimensional analysis result of the epoxy sleeve and the stress cone support.

[0013] In a third aspect, an embodiment of the present application provides a device, including a memory and a processor, the memory stores a computer program, and when the processor executes the computer program, the steps of the cable terminal component construction method are implemented.

[0014] In a fourth aspect, an embodiment of the present application provides a readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the cable terminal component construction method are implemented.

[0015] The present application has the following beneficial effects: In the present application, construction parameters of a thick-walled cylinder model corresponding to a cable terminal are obtained, and based on the construction parameters, an equilibrium equation, a geometric equation, a constitutive equation, and a boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal are determined, so as to determine pressure parameters of the cable terminal and radius parameters corresponding to the cable terminal. Among them, the cable terminal includes a stress cone, and the radius parameters corresponding to the cable terminal include the inner radius before stress cone expansion, the inner radius after stress cone expansion, and the outer radius before cable terminal expansion. Based on the pressure parameters of the cable terminal, the radius parameters corresponding to the cable terminal, the equilibrium equation, the geometric equation, the constitutive equation, and the boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal, an expression of the outer radius after cable terminal expansion and an expression of axial strain are obtained. Based on the radius parameters corresponding to the components of the cable terminal, the expression of axial strain, and the expression of the outer radius after cable terminal expansion, finite element structural analysis is performed to obtain the dimensional analysis results of the epoxy sleeve and the stress cone support corresponding to the cable terminal. Based on the dimensional analysis results of the epoxy sleeve and the stress cone support, the epoxy sleeve and the stress cone support are constructed. Considering the factors of local deformation of the stress cone, the epoxy sleeve and the stress cone support are redesigned, so as to avoid large deformation of the local part of the stress cone, and further make the interface pressure between the contact surfaces uneven, resulting in local stress concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a block diagram of the device provided by the embodiment of the present invention; Figure 2 It is one of the flow diagrams of a method for constructing a cable terminal component provided by the embodiment of the present invention; Figure 3 It is a schematic structural diagram of a composite prefabricated cable terminal provided by the embodiment of the present invention; Figure 4 It is another flow diagram of a method for constructing a cable terminal component provided by the embodiment of the present invention; Figure 5 It is still another flow diagram of a method for constructing a cable terminal component provided by the embodiment of the present invention; Figure 6 It is a non-linear deformation diagram before and after stress cone expansion; Figure 7 It is a distribution diagram of the interface pressure between the stress cone and the cable before and after optimization considering non-linear deformation according to the present invention; Figure 8 The stress cone and epoxy sleeve interface pressure distribution diagrams before and after considering non - linear deformation optimization for the present invention; Figure 9 The interface pressure simulation diagram of the composite cable terminal; Figure 10 The structural block diagram of a cable terminal component construction device provided by an embodiment of the present invention. Detailed implementation manners

[0018] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0020] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0021] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0022] In addition, if terms such as "first", "second", etc. are used only for distinguishing descriptions, they cannot be understood as indicating or implying relative importance.

[0023] In the description of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0024] After extensive research by the inventors, it is found that the design and production of each prefabricated component of the existing composite cable terminal are carried out under ideal conditions. The dimensions of the surrounding prefabricated components are designed and produced using the non-expanded dimensions of the stress cone, assuming that the prefabricated components are in close fit with each other.

[0025] Due to the non-linear deformation when the stress cone expands, the axial dimension of the stress cone becomes shorter, and the radial deformation amounts of different parts of the stress cone are also different. During the actual installation process, the situation where the prefabricated components do not match may occur, that is, there is no close fit between the outside of the stress cone and the epoxy sleeve, and between the stress cone and the cone support. When a spring compensates for the axial force at the lower part of the cone support, the stress cone undergoes large deformation. In the process of converting the spring external force into rubber internal stress and finally acting on each interface through the stress cone to generate interface pressure, the stress cone is locally deformed greatly, which in turn makes the interface pressure between the contact surfaces uneven and local stress concentration occurs. Especially under complex working conditions such as high voltage or high temperature, excessive local stress will accelerate the damage or aging of the cable terminal.

[0026] In view of the discovery of the above problems, the present embodiment provides a method, device, equipment, and storage medium for constructing cable terminal components, which can redesign the epoxy sleeve and the stress cone support by considering the factors of local deformation of the stress cone, so as to avoid large local deformation of the stress cone, and further avoid the uneven interface pressure between the contact surfaces and the occurrence of local stress concentration. The solution provided by the present embodiment will be elaborated in detail below.

[0027] The present embodiment provides an equipment that can construct cable terminal components. In a possible implementation manner, the equipment can be a user terminal. For example, the equipment can be, but is not limited to, a server, a smart phone, a personal computer (PC), a tablet computer, a personal digital assistant (PDA), a mobile internet device (MID), etc.

[0028] Please refer to Figure 1 , Figure 1is a schematic diagram of the structure of the device 100 provided in the embodiment of the present application. The device 100 may also include Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown. Figure 1 Each component shown in the figure can be implemented by hardware, software or a combination thereof.

[0029] The apparatus 100 includes a cable terminal component construction device 110 , a memory 120 , and a processor 130 .

[0030] The memory 120 and the processor 130 are electrically connected to each other directly or indirectly to achieve data transmission or interaction. For example, these components can be electrically connected to each other through one or more communication buses or signal lines. The cable terminal component construction device 110 includes at least one software function module that can be stored in the memory 120 in the form of software or firmware or fixed in the operating system (OS) of the device 100. The processor 130 is used to execute the executable modules stored in the memory 120, such as the software function modules and computer programs included in the cable terminal component construction device 110.

[0031] The memory 120 may be, but is not limited to, a random access memory (RAM), a read only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable read-only memory (EEPROM), etc. The memory 120 is used to store a program, and the processor 130 executes the program after receiving an execution instruction.

[0032] Please refer to Figure 2 , Figure 2 For application Figure 1 The present invention is a flow chart of a method for constructing a cable terminal component of a device 100, and the method including various steps is described in detail below.

[0033] S201: Acquire construction parameters of a thick-walled cylinder model corresponding to the cable terminal, and determine the equilibrium equation, geometric equation, constitutive equation, and boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal based on the construction parameters.

[0034] S202: Determine the pressure parameter of the cable terminal and the radius parameter corresponding to the cable terminal.

[0035] Among them, the cable terminal includes a stress cone, and the radius parameter corresponding to the cable terminal includes the inner radius before stress cone expansion, the inner radius after stress cone expansion, and the outer radius before cable terminal expansion.

[0036] S203: Based on the pressure parameter of the cable terminal, the radius parameter corresponding to the cable terminal, the equilibrium equation, geometric equation, constitutive equation, and boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal, obtain the expression of the outer radius after cable terminal expansion and the expression of axial strain.

[0037] S204: Based on the radius parameter corresponding to the component of the cable terminal, the expression of axial strain, and the expression of the outer radius after cable terminal expansion, perform finite element structural analysis to obtain the dimensional analysis results of the epoxy sleeve and stress cone support corresponding to the cable terminal.

[0038] S205: Construct the epoxy sleeve and stress cone support based on the dimensional analysis results of the epoxy sleeve and stress cone support.

[0039] As Figure 3 shown, it is a schematic diagram of the composite prefabricated cable terminal structure. The composite prefabricated cable terminal includes a conductor core 101, an epoxy sleeve 102, cross-linked polyethylene 103, stress cone insulating rubber 104, an interference fit area 105 between the stress cone and the cable body, stress cone semi-conductive rubber 106, and a stress cone support 107.

[0040] When the stress cone is not expanded, in the ideal state, it fits tightly with the epoxy sleeve 102 and the stress cone support 107. After the stress cone is expanded, it undergoes non-linear deformation. Since the ratio of its outer radius to the inner radius is greater than 1.2, the thick-walled cylinder model can be used for analysis at this time.

[0041] The construction parameters included in the thick-walled cylinder model corresponding to the cable terminal include radial stress , tangential stress , radial strain , tangential strain and radial displacement μ. Based on the construction parameters radial stress , tangential stress , radial strain , tangential strain and radial displacement μ, determine the equilibrium equation, geometric equation, constitutive equation, and boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal.

[0042] The equilibrium equation is: (1) The geometric equation is: , (2) The constitutive equation is: (3) Where: E ——Elastic modulus; ν——Poisson's ratio; is the axial stress, is the axial strain.

[0043] The boundary condition equation that the thick-walled cylinder should satisfy is: (4) Sσ represents the boundary region of the acting force, Fr represents the external radial force (or pressure) applied on this boundary, and Su represents the displacement boundary, that is, the position where the deformation is known. represents the known displacement value specified on this boundary. On the boundary where the displacement is known, the displacement of the cylinder should be equal to the given value.

[0044] On the boundary where the external force is applied, the stress value of the cylinder should match Fr.

[0045] The pressure parameters of the cable terminal include the uniform internal pressure and external pressure on the cable terminal. The corresponding radius parameters of the cable terminal include the inner radius before the stress cone expansion, the inner radius after the stress cone expansion, and the outer radius before the cable terminal expansion.

[0046] By the pressure parameters of the cable terminal and the corresponding radius parameters of the cable terminal, through the derivation and analysis of the equilibrium equation, geometric equation, constitutive equation, and boundary condition equation, the expression of the outer radius after the cable terminal expansion and the expression of the axial strain can be obtained. Based on the radius parameters corresponding to the components of the cable terminal, through the expression of the outer radius after the cable terminal expansion, the outer radius after the cable terminal expansion can be calculated. Based on the radius parameters corresponding to the cable terminal and the outer radius after the cable terminal expansion, the axial strain can be obtained through the expression of the axial strain.

[0047] Based on the outer radius after the cable terminal expansion, the corresponding radius parameters of the cable terminal, and the axial strain, finite element structural analysis is carried out to obtain the size analysis results of the corresponding epoxy sleeve and stress cone support of the cable terminal. Based on the size analysis results, the epoxy sleeve and stress cone support are designed, so that when the stress cone deforms, based on the deformed parameters, the epoxy sleeve and stress cone support are redesigned to avoid cable terminal damage.

[0048] Based on the pressure parameters of the cable terminal, the corresponding radius parameters of the cable terminal, the equilibrium equation, geometric equation, constitutive equation, and boundary condition equation of the corresponding thick-walled cylinder model of the cable terminal, there are various ways to obtain the expression of the outer radius after the cable terminal expansion and the expression of the axial strain. In one implementation, such asFigure 4 As shown, it includes the following steps: S301: Analyze the equilibrium equation, geometric equation, boundary condition equation, and constitutive equation based on the pressure parameter to obtain the similarity equation corresponding to the constitutive equation.

[0049] S302: Based on the radius parameter and the similarity equation corresponding to the constitutive equation, obtain the expression of the axial strain.

[0050] S303: Based on the geometric equation and the similarity equation corresponding to the constitutive equation, obtain the expression of the outer radius after the expansion of the cable terminal.

[0051] Analyzing the equilibrium equation, geometric equation, boundary condition equation, and constitutive equation based on the pressure parameter to obtain the similarity equation corresponding to the constitutive equation can be achieved through the following method: Based on the constitutive equation, geometric equation, and equilibrium equation, obtain the similarity formula corresponding to the first construction parameter, where the first construction parameter includes the radial displacement, radial stress, tangential stress, and axial stress. Based on the pressure parameter of the cable terminal and the boundary condition equation, obtain the similarity equation corresponding to the boundary condition equation. Based on the similarity formula corresponding to the first construction parameter, the similarity equation corresponding to the boundary condition equation, and the constitutive equation, obtain the similarity formula corresponding to the second construction parameter, where the second construction parameter includes the radial strain, tangential strain, and axial strain. Take the similarity formula corresponding to the first construction parameter and the similarity formula corresponding to the second construction parameter as the similarity equation corresponding to the constitutive equation.

[0052] Specifically, substituting the geometric equation (2) into the constitutive equation (3) gives: (5) Then substituting equation (5) into the equilibrium equation (1) gives: (6) Integrating equation (6) gives the similarity equation of the constitutive equation: (7) In equation (7), A, B - integration constants.

[0053] Based on the radius parameter and the similarity equation corresponding to the constitutive equation, to obtain the expression of the axial strain, the similarity expression of the axial strain can be obtained from the similarity formula corresponding to the second construction parameter. Based on the radius parameter and the similarity expression of the axial strain, obtain the expression of the axial strain.

[0054] Specifically, determine the pressure parameter of the cable terminal, including the uniform internal pressure and external pressure on the cable terminal. Based on the pressure parameter of the cable terminal, deform the boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal to obtain the similarity equation of the boundary condition equation: (8) In the formula, a —— inner radius of cable terminal; b —— outer radius of cable terminal.

[0055] Based on the similarity equations (8) and (7) of the boundary condition equation, the integral constants A and B can be obtained: , (9) The tangential strain of the cable terminal can be obtained from the constitutive equation (3) ε θ ( r ), radial strain ε r ( r ) and axial strain ε z solving equations: (10) Take the Poisson's ratio of the rubber material ν = 0.5; the inner diameter before the stress cone expansion R 1, the inner diameter after expansion ; the outer diameter of the cable terminal before expansion R 2, the outer diameter after expansion b is .

[0056] From equation (10), the expression of the axial strain can be obtained: (11) Substitute the geometric equation (2) into the solving equation (10) to get: (12) Because , integrate ε r to get the change of the terminal radial displacement: ; and the radial displacement at the outer diameter of the cylinder r = b is ; Then there is: (13) Substitute equation (12) and R 1, R 2 into equation (13) to get: (14) Deform and solve equation (14) to obtain the expression of the outer radius of the cable terminal after expansion: (15) Based on the radius parameters corresponding to the components of the cable terminal, the expression of the axial strain, and the expression of the outer radius after the expansion of the cable terminal, there are multiple ways to perform finite element structural analysis to obtain the dimensional analysis results of the epoxy sleeve and the stress cone support corresponding to the cable terminal. In one implementation, as Figure 5 shown, it includes the following steps: S401: Determine the radius parameters at each part of the components of the cable terminal.

[0057] S402: Based on the expression of the outer radius after the expansion of the cable terminal and the radius parameters at each part of the components of the cable terminal, obtain the outer radius after the expansion at each part of the cable terminal.

[0058] S403: For the outer radius after the expansion of each cable terminal, based on the outer radius after the expansion of the cable terminal, the radius parameters corresponding to the components of the cable terminal corresponding to the outer radius after the expansion of the cable terminal, and the expression of the axial strain, determine the axial strain corresponding to the outer radius after the expansion of the cable terminal.

[0059] Among them, there is a corresponding relationship between the outer radius after the expansion of the cable terminal, the radius parameters corresponding to the components of the cable terminal, and the axial strain.

[0060] S404: Based on the outer radius after the expansion of each cable terminal, the radius parameters corresponding to the components of the cable terminal corresponding to the outer radius after the expansion of the cable terminal, and the axial strain corresponding to the outer radius after the expansion of the cable terminal, perform finite element structural analysis to obtain the dimensional analysis results of the epoxy sleeve and the stress cone support corresponding to the cable terminal.

[0061] Exemplarily, the component of the cable terminal is component A. Determine the radius parameters at each part of component A respectively. For example, component A includes position 1, position 2, and position 3. Among them, position 1, position 2, and position 3 belong to different positions of component A, and determine the radius parameters at position 1, position 2, and position 3 respectively.

[0062] For example, the radius parameters corresponding to the cable terminal at position 1 include the inner radius before the expansion of the stress cone, the inner radius after the expansion of the stress cone, and the outer radius before the expansion of the cable terminal. Obtain the outer radius after the expansion of the cable terminal at position 1 through the expression of the outer radius after the expansion of the cable terminal. Based on the radius parameters corresponding to the cable terminal at position 1 and the outer radius after the expansion of the cable terminal at position 1, determine the axial strain based on the expression of the axial strain. Based on the radius parameters corresponding to the cable terminal at position 1, the outer radius after the expansion of the cable terminal at position 1, and the corresponding axial strain, obtain the dimensional analysis results of the epoxy sleeve and the stress cone support corresponding to position 1.

[0063] The epoxy sleeve and stress cone support are constructed by determining the dimensional analysis results corresponding to each location.

[0064] As Figure 6 shown, based on the outer radius expression (15) after the expansion of the cable terminal, the deformation amounts of each part of the stress cone can be calculated, and the non-linear deformation diagrams of the stress cone before and after expansion can be obtained.

[0065] Figure 6 It is the expansion deformation diagram when the interference amount of the stress cone radius is 2.5 mm. The blue dashed line in the figure is the structural size of the stress cone before installation, and the red solid line is the structural size of the stress cone after installation. From Figure 6 it can be seen that the axial downward displacement amount at its top is 3.31 mm, the radial outward displacement amount is 1.38 mm, the radial outward displacement amount in the middle is 1.31 mm, and the radial outward displacement amount at the bottom is 2.21 mm.

[0066] Through the cable terminal component construction method provided by this application, the epoxy sleeve and the structural size of the cone support are redesigned. The contact surface between the stress cone and the epoxy sleeve and the cone support is in close contact, so as to optimize the design of the composite cable terminal, realize the uniform distribution of the interface pressure, and effectively relieve the problem of local stress concentration.

[0067] The Comsol finite element calculation and analysis method is used to compare the interface pressure distribution of the stress cone with the cable body and the epoxy sleeve before and after considering the optimization of the non-linear deformation of the stress cone.

[0068] See Figure 7 It is the interface pressure distribution diagram of the stress cone and the cable before and after considering the optimization of the non-linear deformation. When the axial spring pressure of 10 kN is applied, the overall force condition of the stress cone is shown. The legend above is the von Mises stress, and the legend below is the contact pressure. The circled numerical numbers in the figure are the abnormal stress points of the stress cone. The capital English letters AB and CD respectively represent the interface between the stress cone and the cable body and the interface between the stress cone and the epoxy sleeve.

[0069] Figure 8 It is the interface pressure distribution diagram of the stress cone and the epoxy sleeve before and after considering the optimization of the non-linear deformation. See Figure 7 、 Figure 8 They are respectively the interface pressure distribution conditions of the contact surface AB between the stress cone and the cable body and the contact surface CD between the stress cone and the epoxy sleeve before (curve Ⅰ) and after (curve Ⅱ) considering the optimization of the non-linear deformation of the stress cone.

[0070] From Figure 9 it can be seen that the interface pressure at the excessive pressure points ① and ③ on the contact surface AB between the stress cone and the cable body has decreased after optimization, the interface pressure at the low pressure point ② has increased after optimization, and the uneven distribution of the interface pressure has been alleviated.

[0071] From Figure 7It can be seen that the pressure at points ④ and ⑤ where the interface pressure between the stress cone and the epoxy sleeve at the CD interface is too high has been reduced after optimization.

[0072] Please refer to Figure 10 , the embodiment of the present application further provides a cable terminal component construction device 110 applied to Figure 1 the device 100. The cable terminal component construction device 110 includes: An acquisition module 111, configured to acquire construction parameters of a thick-walled cylinder model corresponding to the cable terminal, and determine an equilibrium equation, a geometric equation, a constitutive equation, and a boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal based on the construction parameters; A determination module 112, configured to determine the pressure parameter of the cable terminal and the radius parameter corresponding to the cable terminal. Wherein, the cable terminal includes a stress cone, and the radius parameter corresponding to the cable terminal includes the inner radius before the stress cone expands, the inner radius after the stress cone expands, and the outer radius before the cable terminal expands; based on the pressure parameter of the cable terminal, the radius parameter corresponding to the cable terminal, the equilibrium equation, the geometric equation, the constitutive equation, and the boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal, obtain an expression of the outer radius after the cable terminal expands and an expression of the axial strain; based on the radius parameter corresponding to the component of the cable terminal, the expression of the axial strain, and the expression of the outer radius after the cable terminal expands, perform finite element structural analysis to obtain a dimensional analysis result of the epoxy sleeve and the stress cone support corresponding to the cable terminal; A construction module 113, configured to construct an epoxy sleeve and a stress cone support based on the dimensional analysis result of the epoxy sleeve and the stress cone support.

[0073] The present application further provides a device 100, which includes a processor 130 and a memory 120. The memory 120 stores computer-executable instructions, and when the computer-executable instructions are executed by the processor 130, the cable terminal component construction method is implemented.

[0074] The embodiment of the present application further provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by the processor 130, the cable terminal component construction method is implemented.

[0075] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions, and operations of devices, methods, and computer program products according to multiple embodiments of this application. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of code, and the module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0076] In addition, the functional modules in each embodiment of this application can be integrated together to form an independent part, or each module can exist alone, or two or more modules can be integrated to form an independent part. If the function is implemented in the form of a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of this application. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0077] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element.

[0078] As described above, the above are only various embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present application can easily think of changes or substitutions, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for constructing a cable terminal component, characterized in that, The method includes: Obtaining the construction parameters of the thick-walled cylinder model corresponding to the cable terminal, and determining the equilibrium equation, geometric equation, constitutive equation, and boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal based on the construction parameters; Determining the pressure parameter of the cable terminal and the radius parameters corresponding to the cable terminal, where the cable terminal includes a stress cone, and the radius parameters corresponding to the cable terminal include the inner radius before stress cone expansion, the inner radius after stress cone expansion, and the outer radius before expansion of the cable terminal; Based on the pressure parameter of the cable terminal, the radius parameters corresponding to the cable terminal, the equilibrium equation, geometric equation, constitutive equation, and boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal, obtaining the expression of the outer radius after expansion of the cable terminal and the expression of the axial strain; Based on the radius parameters corresponding to the components of the cable terminal, the expression of the axial strain, and the expression of the outer radius after expansion of the cable terminal, performing finite element structural analysis to obtain the dimensional analysis results of the epoxy sleeve and stress cone support corresponding to the cable terminal; Based on the dimensional analysis results of the epoxy sleeve and the stress cone support, constructing the epoxy sleeve and the stress cone support.

2. The method according to claim 1, wherein The step of obtaining the expression of the outer radius after expansion of the cable terminal and the expression of the axial strain based on the pressure parameter of the cable terminal, the radius parameters corresponding to the cable terminal, the equilibrium equation, geometric equation, constitutive equation, and boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal includes: Analyzing the equilibrium equation, geometric equation, boundary condition equation, and constitutive equation based on the pressure parameter to obtain the similarity equation corresponding to the constitutive equation; Based on the radius parameter and the similarity equation corresponding to the constitutive equation, obtaining the expression of the axial strain; Based on the geometric equation and the similarity equation corresponding to the constitutive equation, obtaining the expression of the outer radius after expansion of the cable terminal.

3. The method according to claim 2, wherein The step of performing finite element structural analysis based on the radius parameters corresponding to the components of the cable terminal, the expression of the axial strain, and the expression of the outer radius after expansion of the cable terminal to obtain the dimensional analysis results of the epoxy sleeve and stress cone support corresponding to the cable terminal includes: Determining the radius parameters of each part of the components of the cable terminal; Based on the expression of the outer radius after expansion of the cable terminal and the radius parameters of each part of the components of the cable terminal, obtaining the outer radius after expansion at each part of the cable terminal; For the outer radius after expansion of each cable terminal, based on the outer radius after expansion of the cable terminal, the radius parameters corresponding to the components of the cable terminal corresponding to the outer radius after expansion of the cable terminal, and the expression of the axial strain, determining the axial strain corresponding to the outer radius after expansion of the cable terminal, where there is a corresponding relationship among the outer radius after expansion of the cable terminal, the radius parameters corresponding to the components of the cable terminal, and the axial strain; Based on the outer radius after expansion of each cable terminal, the radius parameters corresponding to the components of the cable terminal corresponding to the outer radius after expansion of the cable terminal, and the axial strain corresponding to the outer radius after expansion of the cable terminal, finite element structural analysis is performed to obtain the dimensional analysis results of the epoxy sleeve and the stress cone support corresponding to the cable terminal.

4. The method according to claim 2, wherein The step of analyzing the equilibrium equation, geometric equation, boundary condition equation, and constitutive equation based on the pressure parameter to obtain the similarity equation corresponding to the constitutive equation includes: Based on the constitutive equation, geometric equation, and equilibrium equation, a similarity formula for the first construction parameter is obtained, where the first construction parameter includes the radial displacement, radial stress, tangential stress, and axial stress; Based on the pressure parameter of the cable terminal and the boundary condition equation, a similarity equation corresponding to the boundary condition equation is obtained; Based on the similarity formula for the first construction parameter, the similarity equation corresponding to the boundary condition equation, and the constitutive equation, a similarity formula for the second construction parameter is obtained, where the second construction parameter includes the radial strain, tangential strain, and axial strain; The similarity formula for the first construction parameter and the similarity formula for the second construction parameter are used as the similarity equation corresponding to the constitutive equation.

5. The method according to claim 4, characterized in that The step of obtaining the expression of the axial strain based on the radius parameter and the similarity equation corresponding to the constitutive equation includes: Obtaining the similarity expression of the axial strain from the similarity formula for the second construction parameter; Based on the radius parameter and the similarity expression of the axial strain, an expression of the axial strain is obtained.

6. The method according to claim 5, wherein The expression of the axial strain satisfies the following formula: ； where is the axial strain, is the inner radius before the stress cone expansion, is the outer radius of the cable terminal before expansion, ` is the outer radius of the cable terminal after expansion, E is the elastic modulus, and p is the internal pressure applied to the cable terminal in the pressure parameter.

7. The method according to claim 2, wherein The expression of the outer radius after expansion of the cable terminal satisfies the following formula: ； ； Among them, is the inner radius before the stress cone expansion, is the outer radius before the cable terminal expansion, ` is the outer radius after the cable terminal expansion, ` is the inner radius after the stress cone expansion.

8. A cable terminal component construction device, characterized in that, The device includes: An acquisition module for acquiring the construction parameters of the thick-walled cylinder model corresponding to the cable terminal, and determining the equilibrium equation, geometric equation, constitutive equation, and boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal based on the construction parameters; A determination module for determining the pressure parameter of the cable terminal and the radius parameter corresponding to the cable terminal, where the cable terminal includes a stress cone, and the radius parameter corresponding to the cable terminal includes the inner radius before expansion of the stress cone, the inner radius after expansion of the stress cone, and the outer radius before expansion of the cable terminal; based on the pressure parameter of the cable terminal, the radius parameter corresponding to the cable terminal, the equilibrium equation, geometric equation, constitutive equation, and boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal, obtaining the expression of the outer radius after expansion of the cable terminal and the expression of the axial strain; based on the radius parameter corresponding to the components of the cable terminal, the expression of the axial strain, and the expression of the outer radius after expansion of the cable terminal, performing finite element structural analysis to obtain the dimensional analysis results of the epoxy sleeve and the stress cone support corresponding to the cable terminal; A construction module for constructing an epoxy sleeve and a stress cone support based on the dimensional analysis results of the epoxy sleeve and the stress cone support.

9. A device, characterized in that, It includes a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the steps of the method according to any one of claims 1-7 are implemented.

10. A readable storage medium, on which a computer program is stored, characterized in that, When the computer program is executed by the processor, the steps of the method according to any one of claims 1-7 are implemented.

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