Cable termination component construction method, apparatus, device, and readable storage medium

Abstract

The application provides a cable terminal component construction method, device, equipment and storage medium, relates to the field of cable terminal design, and the method comprises the following steps: obtaining construction parameters of a thick-walled cylinder model corresponding to a cable terminal, determining a balance 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, 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, the balance equation, the geometric equation, the constitutive equation and the boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal. Considering the factor of local deformation of the stress cone, the epoxy sleeve and the stress cone support are redesigned, so that the local stress cone is prevented from being subjected to large deformation, and then the interfacial pressure between the contact surfaces becomes uneven, and the phenomenon of local stress concentration occurs.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cable terminal design, in particular to a cable terminal component construction method, device, equipment and storage medium. BACKGROUND

[0002] As an important component in the power system, the main function of the cable terminal is to connect the cable with external equipment and 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 early failures of the cable system are caused by the interface between the cable component and the cable body. At present, the mainstream form of the cable component is the prefabricated cable component, including the whole prefabricated type and the composite prefabricated type. Among them, the composite prefabricated cable terminal is mainly composed of a cable body, a stress cone, an epoxy sleeve, a cone holder and other prefabricated components. When the composite cable terminal is actually installed, the prefabricated components are installed in a certain order and process. The interface pressure between the stress cone and the cable body is mainly derived from the interference fit between the stress cone and the cable and the spring compensation axial force at the lower part of the cone holder. However, the design and production of each prefabricated component of the existing composite cable terminal are carried out in an ideal state. The size of the surrounding prefabricated component is designed and produced by using the size of the unexpanded stress cone, and it is considered that each prefabricated component is tightly fitted.

[0003] However, due to the nonlinear deformation of the stress cone when it expands, the axial size of the stress cone becomes shorter, and the radial deformation amount of each part of the stress cone is also different. In the actual installation process, the prefabricated components may not match, that is, the stress cone outside cannot be tightly fitted with the epoxy sleeve and the stress cone cannot be tightly fitted with the cone holder. When the spring compensation axial force is applied at the lower part of the cone holder, the stress cone deforms greatly, converting the external force of the spring into internal stress of the rubber, and finally the interface pressure between the interfaces is generated through the action of the stress cone. In the process, the stress cone is locally deformed, which makes the interface pressure between the contact surfaces uneven and causes local stress concentration. Especially under complex working conditions such as high pressure or high temperature, the local stress is too large, which accelerates the damage or aging of the cable terminal. SUMMARY

[0004] The purpose of the present application is to provide a cable terminal component construction method, device, equipment and storage medium, which can solve the problem caused by the nonlinear deformation of the stress cone in the design of the composite cable terminal, and further avoid the damage of the cable terminal.

[0005] In order to achieve the above purpose, the technical scheme adopted by the embodiments of the present application is as follows:

[0006] In a first aspect, the embodiments of the present application provide a cable terminal component construction method, which comprises:

[0007] obtain construction parameters of a thick-walled cylinder model corresponding to the cable terminal, and determine a balance 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;

[0008] determine a pressure parameter of the cable terminal and a radius parameter corresponding to the cable terminal, wherein the cable terminal comprises a stress cone, and the radius parameter corresponding to the cable terminal comprises an inner radius before expansion of the stress cone, an inner radius after expansion of the stress cone and an outer radius before expansion of the cable terminal;

[0009] obtain an outer radius expression after expansion of the cable terminal and an expression of axial strain based on the pressure parameter of the cable terminal, the radius parameter corresponding to the cable terminal, the balance equation, the geometric equation, the constitutive equation and the boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal;

[0010] perform finite element structure analysis based on the radius parameter corresponding to a component of the cable terminal, the expression of axial strain and the outer radius expression after expansion of the cable terminal, and obtain a size analysis result of an epoxy sleeve and a stress cone support corresponding to the cable terminal;

[0011] construct the epoxy sleeve and the stress cone support based on the size analysis result of the epoxy sleeve and the stress cone support.

[0012] In an optional implementation, the step of obtaining the outer radius expression after expansion of the cable terminal and the expression of axial strain based on the pressure parameter of the cable terminal, the radius parameter corresponding to the cable terminal, the balance equation, the geometric equation, the constitutive equation and the boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal comprises:

[0013] analyze the balance equation, the geometric equation, the boundary condition equation and the constitutive equation based on the pressure parameter, and obtain a similarity equation corresponding to the constitutive equation;

[0014] obtain the expression of axial strain based on the radius parameter and the similarity equation corresponding to the constitutive equation;

[0015] obtain the outer radius expression after expansion of the cable terminal based on the geometric equation and the similarity equation corresponding to the constitutive equation.

[0016] In an optional implementation, the step of performing finite element structure analysis based on the radius parameter corresponding to a component of the cable terminal, the expression of axial strain and the outer radius expression after expansion of the cable terminal, and obtaining a size analysis result of an epoxy sleeve and a stress cone support corresponding to the cable terminal comprises:

[0017] determining each radius parameter at each part of the cable terminal;

[0018] obtaining an expanded outer radius of each part of the cable terminal based on the expanded outer radius expression of the cable terminal and the radius parameters at each part of the cable terminal;

[0019] for each expanded outer radius of the cable terminal, determining an axial strain corresponding to the expanded outer radius of the cable terminal based on the expanded outer radius of the cable terminal, the radius parameter corresponding to the part of the cable terminal corresponding to the expanded outer radius of the cable terminal, and the expression of the axial strain, wherein the expanded outer radius of the cable terminal, the radius parameter corresponding to the part of the cable terminal, and the axial strain have a corresponding relationship;

[0020] performing a finite element structure analysis based on the expanded outer radius of each cable terminal, the radius parameter corresponding to the part of the cable terminal corresponding to the expanded outer radius of the cable terminal, and the axial strain corresponding to the expanded outer radius of the cable terminal, to obtain a size analysis result of the epoxy sleeve and the stress cone support corresponding to the cable terminal.

[0021] In an optional embodiment, the step of analyzing the balance equation, the geometric equation, the boundary condition equation, and the constitutive equation based on the pressure parameter to obtain a similar equation corresponding to the constitutive equation comprises:

[0022] obtaining a similar formula corresponding to a first construction parameter based on the constitutive equation, the geometric equation, and the balance equation, wherein the first construction parameter includes a radial displacement amount, a radial stress, a tangential stress, and an axial stress;

[0023] obtaining a similar equation corresponding to the boundary condition equation based on the pressure parameter of the cable terminal and the boundary condition equation;

[0024] obtaining a similar formula corresponding to a second construction parameter based on the similar formula corresponding to the first construction parameter, the similar equation corresponding to the boundary condition equation, and the constitutive equation, wherein the second construction parameter includes a radial strain, a tangential strain, and an axial strain;

[0025] taking the similar formula corresponding to the first construction parameter and the similar formula corresponding to the second construction parameter as the similar equation corresponding to the constitutive equation.

[0026] In an optional embodiment, the step of obtaining an expression of the axial strain based on the radius parameter and the similar equation corresponding to the constitutive equation comprises:

[0027] obtaining a similar expression of the axial strain from the similar formula corresponding to the second construction parameter;

[0028] Based on the similar expressions of the radius parameter and the axial strain, an expression of the axial strain is obtained.

[0029] In an optional embodiment, the expression of the axial strain satisfies the following formula:

[0030] ;

[0031] wherein is the axial strain, is the inner radius before the stress cone is expanded, is the outer radius before the cable terminal is expanded, is the outer radius after the cable terminal is expanded, E is the elastic modulus, and p is the internal pressure that the cable terminal is subjected to in the pressure parameter.

[0032] In an optional embodiment, the expression of the outer radius after the cable terminal is expanded satisfies the following formula:

[0033] ;

[0034] ;

[0035] wherein, is the inner radius before the stress cone is expanded, is the outer radius before the cable terminal is expanded, is the outer radius after the cable terminal is expanded, is the inner radius after the stress cone is expanded.

[0036] In a second aspect, an embodiment of the present application provides a cable terminal component construction device, and the device comprises:

[0037] An acquisition module is configured to acquire construction parameters of a thick-walled cylinder model corresponding to a cable terminal, and determine a balance 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.

[0038] The determining module is configured to determine a pressure parameter of the cable terminal and a radius parameter corresponding to the cable terminal, wherein the cable terminal comprises a stress cone, the radius parameter corresponding to the cable terminal comprises an inner radius before expansion of the stress cone, an inner radius after expansion of the stress cone, and an 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, a balance equation of a thick-walled cylinder model corresponding to the cable terminal, a geometric equation, a constitutive equation, and a boundary condition equation, an expression of the outer radius after expansion of the cable terminal and an expression of an axial strain are obtained; based on the radius parameter corresponding to a component of the cable terminal, the expression of the axial strain, and the expression of the outer radius after expansion of the cable terminal, a finite element structure analysis is performed to obtain a size analysis result of an epoxy sleeve and a stress cone support corresponding to the cable terminal.

[0039] The constructing module is configured to construct the epoxy sleeve and the stress cone support based on the size analysis result of the epoxy sleeve and the stress cone support.

[0040] In a third aspect, an apparatus is provided, which includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the method for constructing a cable terminal component when executing the computer program.

[0041] In a fourth aspect, a readable storage medium is provided, which stores a computer program, and the computer program is executed by a processor to implement the steps of the method for constructing a cable terminal component.

[0042] The present application has the following beneficial effects:

[0043] The application obtains the construction parameters of the thick-walled cylinder model corresponding to the cable terminal, determines the balance 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, determines the pressure parameters of the cable terminal and the radius parameters corresponding to the cable terminal, wherein the cable terminal comprises a stress cone, and the radius parameters corresponding to the cable terminal comprise 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, obtains the outer radius expression after the cable terminal expands and the expression of the axial strain based on the pressure parameters of the cable terminal, the radius parameters corresponding to the components of the cable terminal, the expression of the axial strain and the outer radius expression after the cable terminal expands, performs finite element structure analysis to obtain the size analysis results of the epoxy sleeve and the stress cone support corresponding to the cable terminal, and constructs the epoxy sleeve and the stress cone support based on the size analysis results of the epoxy sleeve and the stress cone support. Considering the factor of local deformation of the stress cone, the epoxy sleeve and the stress cone support are redesigned, so that the local stress cone is prevented from being deformed greatly, and the interface pressure between the contact surfaces becomes uneven, and the local stress concentration phenomenon occurs. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0045] Figure 1 The block schematic diagram of the device provided by the embodiments of the present application is shown in the figure;

[0046] Figure 2 The flowchart of the cable terminal component construction method provided by the embodiments of the present application is shown in the figure;

[0047] Figure 3 The composite prefabricated cable terminal structure provided by the embodiments of the present application is shown in the figure;

[0048] Figure 4 The flowchart of the cable terminal component construction method provided by the embodiments of the present application is shown in the figure;

[0049] Figure 5 The flowchart of the cable terminal component construction method provided by the embodiments of the present application is shown in the figure;

[0050] Figure 6 The nonlinear deformation diagram of the stress cone before and after expansion is shown in the figure;

[0051] Figure 7 The stress cone and cable interface pressure distribution diagram before and after the nonlinear deformation optimization is considered for the present application;

[0052] Figure 8 The stress cone and epoxy sleeve interface pressure distribution diagram before and after the nonlinear deformation optimization is considered for the present application;

[0053] Figure 9 The composite cable terminal interface pressure simulation diagram is provided.

[0054] Figure 10 A structural block diagram of a cable terminal part construction device provided by an embodiment of the present application is provided. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0056] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0057] It should be noted that: similar reference numbers and letters represent 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.

[0058] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is used, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0059] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0060] In the description of the present application, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "set", "install", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0061] The inventor found through a large number of researches that the design and production of each prefabricated part of the existing composite cable terminal are carried out in an ideal state, the size of the surrounding prefabricated part is designed and produced by using the size of the unexpanded stress cone, and it is considered that each prefabricated part is closely fitted.

[0062] Because the stress cone expands and nonlinear deformation occurs, the axial size of the stress cone becomes shorter, and the radial deformation amount of each part of the stress cone is not the same. In the actual installation process, the situation that each prefabricated part does not match, that is, the stress cone outside and the epoxy sleeve, and the stress cone and the cone holder cannot be closely fitted, occurs. When the spring compensation axial force is applied to the lower part of the cone holder, the stress cone deforms greatly, converts the external force of the spring into the internal stress of the rubber, and finally acts on each interface to generate interface pressure. In the process, the stress cone locally deforms greatly, and then the interface pressure between the contact surfaces becomes uneven, and the local stress concentration phenomenon occurs. Especially under complex working conditions such as high pressure or high temperature, the local stress is too large, which accelerates the damage or aging of the cable terminal.

[0063] In view of the above problems, the embodiment provides a cable terminal part construction method, device, equipment and storage medium, which can consider the local deformation of the stress cone to redesign the epoxy sleeve and the stress cone holder, thereby avoiding the local deformation of the stress cone, and then making the interface pressure between the contact surfaces uneven and the local stress concentration phenomenon. The scheme provided by the embodiment is described in detail below.

[0064] The embodiment provides a device capable of constructing a cable terminal part. In a possible implementation manner, the device can be a user terminal, for example, the device 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), and the like.

[0065] Please refer to Figure 1 , Figure 1is a structural schematic diagram of the device 100 provided by an embodiment of the present application. The device 100 can further include more or fewer components than those shown in Figure 1 or have a different configuration than that shown in Figure 1 . Figure 1 The components shown in may be implemented in hardware, software, or a combination thereof.

[0066] The device 100 includes a cable terminal component construction apparatus 110, a memory 120, and a processor 130.

[0067] 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 elements can be electrically connected to each other through one or more communication buses or signal lines. The cable terminal component construction apparatus 110 includes at least one software function module that can be stored in the memory 120 in the form of software or firmware or solidified in the operating system (OS) of the device 100. The processor 130 is configured to execute executable modules stored in the memory 120, such as software function modules included in the cable terminal component construction apparatus 110 and computer programs.

[0068] The memory 120 can 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 programmable read-only memory (EEPROM), and the like. The memory 120 is configured to store programs, and the processor 130 executes the programs after receiving an execution instruction.

[0069] Please refer to Figure 2 , Figure 2 for a cable terminal component construction method applied to the device 100. The following will describe the method in detail. Figure 1

[0070] S201: Obtain construction parameters of a thick-walled cylinder model corresponding to the cable terminal, and determine a balance 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.

[0071] S202: Determine the pressure parameters of the cable terminal and the corresponding radius parameters of the cable terminal.

[0072] The cable terminal includes a stress cone, and the radius parameters corresponding to the cable terminal include the inner radius of the stress cone before expansion, the inner radius of the stress cone after expansion, and the outer radius of the cable terminal before expansion.

[0073] S203: Based on the pressure parameters of the cable terminal, the radius parameters corresponding to the cable terminal, the equilibrium equations, geometric equations, constitutive equations, and boundary condition equations of the thick-walled cylindrical model corresponding to the cable terminal, the expressions for the outer radius and axial strain of the cable terminal after expansion are obtained.

[0074] S204: Based on the radius parameters of the components corresponding to the cable terminal, the expression of axial strain, and the expression of the outer radius after the cable terminal is expanded, finite element structural analysis is performed to obtain the dimensional analysis results of the epoxy sleeve and stress cone support corresponding to the cable terminal.

[0075] S205: Based on the dimensional analysis results of the epoxy sleeve and stress cone support, construct the epoxy sleeve and stress cone support.

[0076] like Figure 3 The diagram shows a composite prefabricated cable terminal structure. The composite prefabricated cable terminal includes a conductor core 101, an epoxy sleeve 102, cross-linked polyethylene 103, a stress cone insulating rubber 104, an interference fit area between the stress cone and the cable body 105, a stress cone semi-conductive rubber 106, and a stress cone support 107.

[0077] Ideally, before the stress cone expands, it fits tightly against the epoxy sleeve 102 and the stress cone support 107. After the stress cone expands, it undergoes nonlinear deformation. Since the ratio of its outer radius to its inner radius is greater than 1.2, a thick-walled cylindrical model can be used for analysis.

[0078] The construction parameters of the thick-walled cylindrical model corresponding to the cable termination include radial stress. tangential stress radial strain Tangential strain And the radial displacement μ, based on the construction parameter radial stress tangential stress radial strain Tangential strain The radial displacement μ determines the equilibrium equations, geometric equations, constitutive equations, and boundary condition equations for the thick-walled cylindrical model corresponding to the cable terminal.

[0079] The equilibrium equation is:

[0080] (1)

[0081] The geometric equation is:

[0082] , (2)

[0083] The constitutive equation is:

[0084] (3)

[0085] In the formula: E Elastic modulus; v - Poisson's ratio; is the axial stress, is the axial strain.

[0086] The boundary condition equation that the thick-walled cylinder should satisfy is:

[0087] (4)

[0088] Sσrepresents the boundary area of the acting force, Frrepresents the external radial force (or pressure) applied on the boundary, and Su represents the displacement boundary, i.e., the position of the known deformation. represents the known displacement value specified on the boundary, and on the boundary where the displacement is known, the displacement of the cylinder is equal to the given value.

[0089] On the boundary where the external force is applied, the stress value of the cylinder is matched with Fr.

[0090] The pressure parameters of the cable terminal include that the cable terminal is subjected to uniform internal pressure and external pressure, and the radius parameters corresponding to the cable terminal include the internal radius before the stress cone expands, the internal radius after the stress cone expands, and the external radius before the cable terminal expands.

[0091] Through the pressure parameters of the cable terminal and the radius parameters corresponding to the cable terminal, the equilibrium equation, the geometric equation, the constitutive equation, and the boundary condition equation are analyzed to obtain the expression of the external radius after the cable terminal expands and the expression of the axial strain. Based on the radius parameters corresponding to the components of the cable terminal, the external radius after the cable terminal expands can be calculated through the expression of the external radius after the cable terminal expands, and based on the radius parameters corresponding to the cable terminal and the external radius after the cable terminal expands, the axial strain can be obtained through the expression of the axial strain.

[0092] Based on the external radius after the cable terminal expands, the radius parameters corresponding to the cable terminal, and the axial strain, finite element structure analysis is performed to obtain the size analysis results of the epoxy sleeve and the stress cone support corresponding to the cable terminal. Based on the size analysis results, the epoxy sleeve and the stress cone support are designed, so that when the stress cone deforms, the epoxy sleeve and the stress cone support are redesigned based on the parameters after the deformation, thereby avoiding damage to the cable terminal.

[0093] Based on the pressure parameter of the cable terminal, the radius parameter corresponding to the cable terminal, the balance equation of the thick-walled cylinder model corresponding to the cable terminal, the geometric equation, the constitutive equation and the boundary condition equation, there are various implementation manners for obtaining the expression of the outer radius of the expanded cable terminal and the expression of the axial strain. In one implementation manner, as shown in the following formula (2), the following steps are included: Figure 4

[0094] S301: Based on the pressure parameter, the balance equation, the geometric equation, the boundary condition equation and the constitutive equation are analyzed to obtain the similarity equation corresponding to the constitutive equation.

[0095] S302: Based on the similarity equation corresponding to the radius parameter and the constitutive equation, the expression of the axial strain is obtained.

[0096] S303: Based on the similarity equation corresponding to the geometric equation and the constitutive equation, the expression of the outer radius of the expanded cable terminal is obtained.

[0097] The analysis of the balance equation, the geometric equation, the boundary condition equation and the constitutive equation based on the pressure parameter to obtain the similarity equation corresponding to the constitutive equation can be obtained in the following manner:

[0098] Based on the constitutive equation, the geometric equation and the balance equation, the similarity formula corresponding to the first construction parameter is obtained, wherein the first construction parameter includes the radial displacement, the radial stress, the tangential stress and the axial stress. Based on the pressure parameter of the cable terminal and the boundary condition equation, the similarity equation corresponding to the boundary condition equation is obtained. Based on the similarity formula corresponding to the first construction parameter, the similarity equation corresponding to the boundary condition equation and the constitutive equation, the similarity formula corresponding to the second construction parameter is obtained, wherein the second construction parameter includes the radial strain, the tangential strain and the axial strain. The similarity formula corresponding to the first construction parameter and the similarity formula corresponding to the second construction parameter are taken as the similarity equation corresponding to the constitutive equation.

[0099] Specifically, the geometric equation (2) is substituted into the constitutive equation (3) to obtain:

[0100] (5)

[0101] Then, the formula (5) is substituted into the balance equation (1) to obtain:

[0102] (6)

[0103] The integral of the formula (6) is the similarity equation of the constitutive equation:

[0104] (7)

[0105] In the formula (7), A and B are integral constants. ​

[0106] Based on the radius parameter and the similar equation corresponding to the constitutive equation, the expression of the axial strain can be obtained from the similar expression of the axial strain corresponding to the second construction parameter, and based on the radius parameter and the similar expression of the axial strain, the expression of the axial strain is obtained.

[0107] Specifically, the pressure parameters of the cable terminal are determined, including the uniform internal pressure and external pressure of the cable terminal, and based on the pressure parameters of the cable terminal, the boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal is deformed to obtain a similar equation of the boundary condition equation:

[0108] (8)

[0109] In the formula, a The inner radius of the cable terminal; b The outer radius of the cable terminal.

[0110] Based on the similar equation (8) of the boundary condition equation and formula (7), the integral constants A and B can be obtained:

[0111] , (9)

[0112] The solving equation of the tangential strain θ ε , r r the radial strain ε , z r and the axial strain ε of the cable terminal can be obtained from the constitutive equation (3):

[0113] (10)

[0114] Taking the Poisson's ratio of the rubber material ν = 0.5; the inner diameter before the expansion of the stress cone R 1, the inner diameter after the expansion ; the outer diameter of the cable terminal before the expansion R 2, the outer diameter after the expansion b .

[0115] From formula (10), the expression of the axial strain can be obtained:

[0116] (11)

[0117] Substituting the geometric equation (2) into the solving equation (10) obtains:

[0118] (12)​

[0119] Because , the radial displacement of the terminal at the outer diameter of the cylinder is ε r Integrating the above equation, the change of the radial displacement of the terminal is:

[0120] ;

[0121] And the radial displacement of the terminal at the outer diameter of the cylinder is r = b ;

[0122] Therefore, the following equation is obtained:

[0123] (13)

[0124] Substituting equation (12) and R 1, R 2 into equation (13), the following equation is obtained:

[0125] (14)

[0126] The expression of the outer radius of the expanded cable terminal is obtained by solving equation (14):

[0127] (15)

[0128] Based on the radius parameters of the components of the cable terminal, the expression of the axial strain, and the expression of the outer radius of the expanded cable terminal, there are various implementation manners for obtaining the size analysis result of the epoxy sleeve and the stress cone support corresponding to the cable terminal. In one implementation manner, as shown in FIG. 1, the implementation manner includes the following steps: Figure 5

[0129] S401: determining the radius parameters of the components of the cable terminal.

[0130] S402: obtaining the outer radius of the expanded cable terminal based on the expression of the outer radius of the expanded cable terminal and the radius parameters of the components of the cable terminal.

[0131] S403: for each outer radius of the expanded cable terminal, determining the axial strain corresponding to the outer radius of the expanded cable terminal based on the outer radius of the expanded cable terminal, the radius parameters of the components of the cable terminal corresponding to the outer radius of the expanded cable terminal, and the expression of the axial strain.

[0132] The outer radius of the expanded cable terminal, the radius parameters of the components of the cable terminal, and the axial strain have a corresponding relationship.

[0133] ​​S404: Based on the outer radius of each cable terminal after expansion, the radius parameter corresponding to the component of the cable terminal corresponding to the outer radius of the cable terminal after expansion, and the axial strain corresponding to the outer radius of the cable terminal after expansion, finite element structure analysis is carried out to obtain the size analysis result of the epoxy sleeve and the stress cone support corresponding to the cable terminal.

[0134] For example, the components of the cable terminal are A components, and the radius parameters of each part of the A components are determined respectively, such as the A components including 1, 2 and 3, wherein 1, 2 and 3 belong to different positions of the A components, and the radius parameters of 1, 2 and 3 are determined respectively.

[0135] For example, the radius parameters corresponding to the cable terminal at 1 include the inner radius of the stress cone before expansion, the inner radius of the stress cone after expansion, and the outer radius of the cable terminal before expansion, the outer radius of the cable terminal after expansion is obtained by the outer radius expression of the cable terminal after expansion, the axial strain is determined based on the radius parameters corresponding to the cable terminal at 1 and the outer radius of the cable terminal after expansion at 1, and the axial strain is determined based on the expression of the axial strain, and the size analysis result of the epoxy sleeve and the stress cone support corresponding to 1 is obtained based on the radius parameters corresponding to the cable terminal at 1, the outer radius of the cable terminal after expansion at 1 and the corresponding axial strain.

[0136] By determining the size analysis result of the epoxy sleeve and the stress cone support corresponding to each part, the epoxy sleeve and the stress cone support are constructed.

[0137] As shown in Figure 6 , the deformation of each part of the stress cone can be calculated based on the outer radius expression of the cable terminal after expansion (15), and the nonlinear deformation diagram of the stress cone before and after expansion is obtained.

[0138] Figure 6 The stress cone radius interference amount is 2.5mm, and the expansion deformation diagram is shown in the figure. The blue dotted line in the figure is the structure size of the stress cone before installation, and the red solid line is the structure size of the stress cone after installation. As shown in Figure 6 , the top axial displacement is 3.31mm, the radial outward displacement is 1.38mm, the middle radial outward displacement is 1.31mm, and the bottom radial outward displacement is 2.21mm.

[0139] By using the cable terminal component construction method provided in the present application, the structure size of the epoxy sleeve and the cone support is redesigned. The stress cone is in close contact with the contact surface of the epoxy sleeve and the cone support, so as to optimize the design of the composite cable terminal, realize the uniform distribution of the interface pressure, and effectively alleviate the local stress concentration problem.

[0140] By using the Comsol finite element calculation and analysis method, the interface pressure distribution of the stress cone and the cable body and the epoxy sleeve before and after considering the nonlinear deformation optimization of the stress cone is compared.

[0141] Referring to Figure 7 To consider the nonlinear deformation optimization before and after the stress cone and cable interface pressure distribution diagram, when the spring axial pressure 10kN is applied, the stress cone overall stress situation, the upper legend is von Mises stress, the lower legend is contact pressure. The circled number in the figure is the abnormal stress point of the stress cone. The capital letters AB, CD respectively represent the stress cone and the cable body interface, the stress cone and the epoxy sleeve interface.

[0142] Figure 8 To consider the nonlinear deformation optimization before and after the stress cone and epoxy sleeve interface pressure distribution diagram. Referring to Figure 7 , Figure 8 The stress cone and the cable body contact surface AB, the stress cone and the epoxy sleeve contact surface CD consider the stress cone nonlinear deformation optimization before (curve I) and after optimization (curve II) interface pressure distribution.

[0143] It can be seen from Figure 9 that the stress cone and the cable body contact surface AB interface pressure too large point ① ③ after optimization has been reduced, the interface pressure too low point ② after optimization has been increased, the interface pressure distribution is not uniform. The situation has been eased.

[0144] It can be seen from Figure 7 that the stress cone and the epoxy sleeve contact surface CD interface pressure too large point ④ ⑤ after optimization has been reduced.

[0145] Please refer to Figure 10 , the application embodiment further provides a cable terminal component construction device 110 applied to Figure 1 The cable terminal component construction device 110 of the device 100, the cable terminal component construction device 110 comprises:

[0146] The acquisition module 111 is used for acquiring the construction parameter of the thick-walled cylinder model corresponding to the cable terminal, and determining the balance equation, the geometric equation, the constitutive equation and the boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal based on the construction parameter;

[0147] The determining module 112 is configured to determine a stress parameter of the cable terminal and a radius parameter corresponding to the cable terminal, wherein the cable terminal comprises a stress cone, the radius parameter corresponding to the cable terminal comprises an inner radius before expansion of the stress cone, an inner radius after expansion of the stress cone, and an outer radius before expansion of the cable terminal; based on the stress parameter of the cable terminal, the radius parameter corresponding to the cable terminal, a balance equation of a thick-walled cylinder model corresponding to the cable terminal, a geometric equation, a constitutive equation, and a boundary condition equation, an expression of the outer radius after expansion of the cable terminal and an expression of an axial strain are obtained; based on the radius parameter corresponding to a component of the cable terminal, the expression of the axial strain, and the expression of the outer radius after expansion of the cable terminal, a finite element structure analysis is performed to obtain a size analysis result of the epoxy sleeve and the stress cone holder corresponding to the cable terminal.

[0148] The constructing module 113 is configured to construct the epoxy sleeve and the stress cone holder based on the size analysis result of the epoxy sleeve and the stress cone holder.

[0149] The application further provides a device 100, which comprises a processor 130 and a memory 120. The memory 120 stores computer executable instructions, and the computer executable instructions are executed by the processor 130 to implement the cable terminal component construction method.

[0150] The application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by the processor 130 to implement the cable terminal component construction method.

[0151] In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can also be implemented by other manners. The apparatus embodiments described above are only schematic, for example, the flowcharts and block diagrams in the drawings show the possible implementation architectures, functions and operations of the apparatus, method and computer program product according to the embodiments of the present application. In this regard, each block in the flowcharts or block diagrams can represent a module, a program segment or a part of code, which contains one or more executable instructions for implementing the specified logic function. It should also be noted that, in some alternative implementation manners, the functions noted in the blocks can also occur in different orders from those noted in the drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and sometimes they can also be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and the combination of blocks in the block diagrams and / or flowcharts, can be implemented by a dedicated hardware-based system for executing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0152] In addition, each of the functional modules in the various embodiments of the present application can be integrated together to form an independent part, or each of the modules can exist independently, or two or more modules can be integrated to form an independent part. When the functions are realized in the form of software functional modules and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for causing 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 the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various program code storage media.

[0153] It should be noted that, in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0154] The above is only various embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, 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 of constructing a cable termination component, characterized by, The method comprises: obtaining the construction parameters of the thick-walled cylinder model corresponding to the cable terminal, and determining the balance equation, the geometric equation, the constitutive equation and the boundary condition equation of the thick-walled cylinder model corresponding to the cable terminal based on the construction parameters; determining the pressure parameters of the cable terminal and the radius parameters corresponding to the cable terminal, wherein the cable terminal comprises a stress cone, and the radius parameters corresponding to the cable terminal comprise an inner radius before expansion of the stress cone, an inner radius after expansion of the stress cone and an outer radius before expansion of the cable terminal; based on the pressure parameters, analyzing the balance equation, the geometric equation, the boundary condition equation and the constitutive equation to obtain the similarity equation corresponding to the constitutive equation; based on the radius parameters and the similarity equation corresponding to the constitutive equation, obtaining an expression of axial strain; based on the geometric equation and the similarity equation corresponding to the constitutive equation, obtaining an expression of the outer radius of the cable terminal after expansion; determining the radius parameters of each part of the cable terminal; based on the expression of the outer radius of the cable terminal after expansion and the radius parameters of each part of the cable terminal, obtaining the outer radius of each part of the cable terminal after expansion; for each outer radius of the cable terminal after expansion, based on the outer radius of the cable terminal after expansion, the radius parameters corresponding to the parts of the cable terminal corresponding to the outer radius of the cable terminal after expansion and the expression of the axial strain, determining the axial strain corresponding to the outer radius of the cable terminal after expansion, wherein the outer radius of the cable terminal after expansion, the radius parameters corresponding to the parts of the cable terminal corresponding to the outer radius of the cable terminal after expansion and the axial strain have a corresponding relationship; based on the outer radius of each cable terminal after expansion, the radius parameters corresponding to the parts of the cable terminal corresponding to the outer radius of the cable terminal after expansion and the axial strain corresponding to the outer radius of the cable terminal after expansion, performing finite element structure analysis to obtain size analysis results of the epoxy sleeve and the stress cone support corresponding to the cable terminal; based on the size analysis results of the epoxy sleeve and the stress cone support, constructing the epoxy sleeve and the stress cone support.

2. The method of claim 1, wherein, The step of analyzing the balance equation, the geometric equation, the boundary condition equation and the constitutive equation based on the pressure parameters to obtain the similarity equation corresponding to the constitutive equation comprises: based on the constitutive equation, the geometric equation and the balance equation, obtaining a similarity formula corresponding to a first construction parameter, wherein the first construction parameter comprises a radial displacement, a radial stress, a tangential stress and an axial stress; based on the pressure parameters of the cable terminal and the boundary condition equation, obtaining a 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, obtaining a similarity formula corresponding to a second construction parameter, wherein the second construction parameter comprises a radial strain, a tangential strain and an axial strain; the similarity formula corresponding to the first construction parameter and the similarity formula corresponding to the second construction parameter are taken as the similarity equation corresponding to the constitutive equation.

3. The method of claim 2, wherein, The step of obtaining the expression of the axial strain based on the radius parameters and the similarity equation corresponding to the constitutive equation comprises: obtaining a similar expression of the axial strain from a similar formula corresponding to the second construction parameter; obtaining an expression of the axial strain based on the radius parameter and the similar expression of the axial strain.

4. The method of claim 3, wherein, The expression of the axial strain satisfies the following formula: ； wherein is the axial strain, is the inner radius before the stress cone expansion, is the outer radius before the cable termination expansion, is the outer radius after the cable termination expansion, E is the modulus of elasticity, and p is the internal pressure to which the cable termination is subjected in the pressure parameter.

5. The method of claim 1, wherein, The expression of the outer radius of the cable terminal after expansion satisfies the following formula: ； ； wherein Ri is the inner radius of the stress cone before expansion, R2 is the outer radius of the cable termination before expansion, R2' is the outer radius of the cable termination after expansion, Ri' is the inner radius of the stress cone after expansion.

6. A cable termination component building apparatus, characterized by, The device comprises: An obtaining module is configured to obtain construction parameters of a thick-walled cylinder model corresponding to a cable terminal, and determine a balance 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 determining module is configured to determine a pressure parameter of the cable terminal and radius parameters corresponding to the cable terminal, wherein the cable terminal comprises a stress cone, and the radius parameters corresponding to the cable terminal comprise an inner radius of the stress cone before expansion, an inner radius of the stress cone after expansion and an outer radius of the cable terminal before expansion; analyzing the balance equation, the geometric equation, the boundary condition equation and the constitutive equation based on the pressure parameter to obtain a similar equation corresponding to the constitutive equation; obtaining an expression of the axial strain based on the radius parameter and the similar equation corresponding to the constitutive equation; obtaining an expression of the outer radius of the cable terminal after expansion based on the similar equation corresponding to the geometric equation and the constitutive equation; determining each radius parameter at each part of the components of the cable terminal; obtaining the outer radius of the cable terminal after expansion at each part based on the expression of the outer radius of the cable terminal after expansion, the radius parameters corresponding to the components of the cable terminal corresponding to the outer radius of the cable terminal after expansion and the expression of the axial strain; for each outer radius of the cable terminal after expansion, determining the axial strain corresponding to the outer radius of the cable terminal after expansion based on the outer radius of the cable terminal after expansion, the radius parameters corresponding to the components of the cable terminal corresponding to the outer radius of the cable terminal after expansion and the expression of the axial strain, wherein the outer radius of the cable terminal after expansion, the radius parameters corresponding to the components of the cable terminal and the axial strain have a corresponding relationship; performing finite element structure analysis based on the outer radius of each cable terminal after expansion, the radius parameters corresponding to the components of the cable terminal corresponding to the outer radius of the cable terminal after expansion and the axial strain corresponding to the outer radius of the cable terminal after expansion to obtain a size analysis result of an epoxy sleeve and a stress cone holder corresponding to the cable terminal; A constructing module is configured to construct the epoxy sleeve and the stress cone holder based on the size analysis result of the epoxy sleeve and the stress cone holder.

7. An apparatus, comprising: The computer program is executed by the processor to implement the steps of the method of any one of claims 1-5.

8. A readable storage medium, having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the method of any one of claims 1-5.

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