Method and device for calculating critical value of arc injection energy in intermediate joint channel

Abstract

The present application provides a method and device for calculating the critical value of arc injection energy in an intermediate joint channel. The method comprises: obtaining a first target parameter, calculating the injection heat of a copper mesh according to the first target parameter to obtain a first injection heat; obtaining a second target parameter, calculating the heat conduction process of the copper mesh according to the first injection heat and the second target parameter to obtain a transient temperature distribution of the copper mesh; determining a first damage area and a first damage depth of the copper mesh according to the transient temperature distribution of the copper mesh, and obtaining a second damage area and a second damage depth of the copper mesh; calculating a first deviation and a second deviation, and when both the first deviation and the second deviation are less than or equal to a first threshold, calculating the injection energy of the arc in the intermediate joint channel into the copper mesh according to the second target parameter to obtain an energy critical value. This method solves the problem in the prior art of lacking a method for calculating injection energy during an intermediate joint explosion.

Description

Technical Field

[0001] The present invention relates to the technical field of explosion-proofing of intermediate joints, and in particular to a method, device, computer-readable storage medium and electronic equipment for calculating a critical value of arc injection energy in an intermediate joint channel. Background Art

[0002] As an essential infrastructure in modern society, high-voltage power cables provide efficient and secure power transmission for urban electricity supply. With urbanization and electrification, cable systems have become the preferred choice for reliable energy transmission.

[0003] However, a key weak point in cable systems is the cable joint. Past statistics show that over 70% of cable explosions occur at this joint. Due to its complex structure and unique operating environment, the joint is susceptible to external factors such as impurities and moisture, which can cause localized electric field anomalies and discharges, ultimately leading to cable accidents such as explosions and fires.

[0004] In cable systems, the vulnerability of cable joints is not only reflected in their frequent failures, but also in the potential for arc breakdown, which can cause unpredictable damage. To gain a deeper understanding of the arc energy released when a cable joint explodes, detailed calculations and analysis are required.

[0005] In summary, in the field of explosion-proof design of high-voltage cable intermediate joints, a method for calculating the critical value of the injection energy of the channel arc into the copper mesh in the intermediate joint is urgently needed. Summary of the Invention

[0006] The main purpose of this application is to provide a method, device, computer-readable storage medium and electronic device for calculating the critical value of the arc injection energy of the intermediate joint channel, so as to at least solve the problem in the prior art of the lack of a method for calculating the injection energy when the intermediate joint explodes.

[0007] To achieve the above objectives, according to one aspect of the present application, a method for calculating a critical value of arc injection energy in an intermediate joint channel is provided, wherein the intermediate joint is wrapped with a copper mesh, and the method comprises: obtaining a first target parameter, and calculating the injection heat of the copper mesh according to the first target parameter to obtain a first injection heat, wherein the first target parameter includes at least the current density, current, and radius of the channel arc; obtaining a second target parameter, and calculating the heat conduction process of the copper mesh according to the first injection heat and the second target parameter to obtain a transient temperature distribution of the copper mesh, wherein the second target parameter includes at least the density and specific heat capacity of the copper mesh; determining the damage area and damage depth of the copper mesh according to the transient temperature distribution of the copper mesh to obtain a first damage area and a first damage depth, obtaining the actual damage area and actual damage depth of the copper mesh to obtain a second damage area and a second damage depth; calculating the difference between the first damage area and the second damage area to obtain a first deviation, and calculating the difference between the first damage depth and the second damage depth to obtain a second deviation. When the first deviation and the second deviation are both less than or equal to a first threshold, calculating the injection energy of the intermediate joint channel arc into the copper mesh according to the second target parameter to obtain an energy critical value.

[0008] Optionally, the injected heat of the copper mesh is calculated according to the first target parameter to obtain the first injected heat, including: obtaining the target electric field and the preset volume, and calculating the Joule heat injected by the channel arc into the copper mesh according to the target electric field and the preset volume to obtain the second injected heat, wherein the target electric field is the electric field inside the copper mesh; obtaining the target current, the preset coefficient and the target radius, and calculating the boundary heat source of the channel arc input into the copper mesh according to the target current, the preset coefficient and the target radius to obtain the third injected heat, wherein the target current is the current of the channel arc, and the target radius is the radius of the channel arc; summing the second injected heat and the third injected heat to obtain the first injected heat.

[0009] Optionally, the Joule heat injected into the copper mesh by the channel arc is calculated according to the target electric field and the preset volume to obtain a second injected heat, including: determining the current density of the copper mesh within the preset volume according to the preset volume to obtain a target current density; substituting the target current density, the preset volume and the target electric field into the first target formula to calculate the power to obtain the injected power: P = ∫ V lJdV; wherein l is the target electric field, V is the preset volume, P is the injection power, and J is the target current density; the second injection heat is obtained by substituting the injection power into the second target formula: Wherein, W is the second injected heat, and T is the action time of the channel arc.

[0010] Optionally, calculating the boundary heat source of the channel arc input into the copper mesh according to the target current, the preset coefficient, and the target radius to obtain a third injected heat comprises: substituting the target current, the preset coefficient, and the target radius into a third target formula to calculate the third injected heat: Among them, Q is the third injected heat, a is the preset coefficient used to characterize the degree of influence of the channel arc on the boundary heat source, r is the point r away from the center of the channel arc, I(t) is the target current, R(t) is the target radius, and t is the acquisition time.

[0011] Optionally, calculating the heat conduction process of the copper mesh according to the first injected heat and the second target parameter to obtain the transient temperature distribution of the copper mesh includes: obtaining a target density, a target specific heat capacity, a target heat transfer coefficient, and a first target temperature, wherein the target density is the density of the copper mesh, the target specific heat capacity is the specific heat capacity of the copper mesh, the target heat transfer coefficient is the heat transfer coefficient of the copper mesh, the target conductivity is the conductivity of the copper mesh, and the first target temperature is the initial temperature of the copper mesh; and constructing a heat conduction equation according to the target density, the target specific heat capacity, the target heat transfer coefficient, the target conductivity, and the first target temperature: Wherein, ρ is the target density, C is the target specific heat capacity, dθ is the temperature change, is a gradient operator, k is the target heat transfer coefficient, θ is the initial temperature, and M satisfies M=Q+W; obtain a target mass and a target latent heat, wherein the target mass is the mass of the copper mesh, and the target latent heat is the latent heat of phase change of the copper mesh; construct a phase change equation based on the target mass and the target latent heat: Wherein, m is the target mass, and L is the target latent heat; the heat conduction equation and the phase change equation are simultaneously solved to obtain the transient temperature distribution of the copper mesh.

[0012] Optionally, the damage area and damage depth of the copper mesh are determined according to the transient temperature distribution of the copper mesh to obtain a first damage area and a first damage depth, including: constructing a three-dimensional rectangular coordinate system with an arbitrary position of the copper mesh as the origin, and traversing the temperature of each position of the copper mesh in the three-dimensional rectangular coordinate system to obtain a second target temperature; when the second target temperature is greater than or equal to a second threshold, the corresponding position is determined as a damaged position, and when the second target temperature is less than the second threshold, the corresponding position is determined as an undamaged position; and determining the first damage area and the first damage depth according to the damaged position and the undamaged position.

[0013] Optionally, after calculating the difference between the first damage area and the second damage area to obtain the first deviation, and calculating the difference between the first damage depth and the second damage depth to obtain the second deviation, the method further includes: when the first deviation or the second deviation is greater than the first threshold, increasing the preset coefficient with a preset gradient and recalculating the first deviation and the second deviation until both the first deviation and the second deviation are less than or equal to the first threshold.

[0014] According to another aspect of the present application, a device for calculating the critical value of arc injection energy of an intermediate joint channel is provided, wherein the intermediate joint is wrapped with a copper mesh, and the device comprises: a first acquisition unit for acquiring a first target parameter, and calculating the injection heat of the copper mesh according to the first target parameter to obtain a first injection heat, wherein the first target parameter at least includes the current density, current and radius of the channel arc; a second acquisition unit for acquiring a second target parameter, and calculating the heat conduction process of the copper mesh according to the first injection heat and the second target parameter to obtain a transient temperature distribution of the copper mesh, wherein the second target parameter at least includes the density and specific heat capacity of the copper mesh; the first calculation unit A unit is used to determine the damage area and damage depth of the copper mesh according to the transient temperature distribution of the copper mesh, obtain a first damage area and a first damage depth, obtain the actual damage area and the actual damage depth of the copper mesh, and obtain a second damage area and a second damage depth; a second calculation unit is used to calculate the difference between the first damage area and the second damage area to obtain a first deviation, calculate the difference between the first damage depth and the second damage depth to obtain a second deviation, and when the first deviation and the second deviation are both less than or equal to the first difference, calculate the injection energy of the intermediate joint channel arc into the copper mesh according to the second target parameter to obtain an energy critical value.

[0015] According to another aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute any one of the methods described.

[0016] According to another aspect of the present application, an electronic device is provided, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of the methods described.

[0017] Applying the technical solution of the present application, in the critical value calculation method of the arc injection energy of the intermediate joint channel, first, a first target parameter is obtained, and the injection heat of the copper mesh is calculated based on the first target parameter to obtain a first injection heat, wherein the first target parameter includes at least the current density, current and radius of the channel arc; then, a second target parameter is obtained, and the heat conduction process of the copper mesh is calculated based on the first injection heat and the second target parameter to obtain a transient temperature distribution of the copper mesh, wherein the second target parameter includes at least the density and specific heat capacity of the copper mesh; thereafter, the damage area and damage depth of the copper mesh are determined based on the transient temperature distribution of the copper mesh to obtain a first damage area and a first damage depth, and the actual damage area and actual damage depth of the copper mesh are obtained to obtain a second damage area and a second damage depth; finally, the difference between the first damage area and the second damage area is calculated to obtain a first deviation, and the difference between the first damage depth and the second damage depth is calculated to obtain a second deviation. When the first deviation and the second deviation are both less than or equal to the first threshold, the injection energy of the intermediate joint channel arc into the copper mesh is calculated based on the second target parameter to obtain an energy critical value. This application uses a numerical simulation method to calculate the heat source based on the measured channel arc of the broken intermediate joint based on a numerical model. The estimated damage area and damage depth of the copper mesh are calculated based on the phase change effect under the high temperature of the copper mesh, and then compared with the actual damage area and actual damage depth. The numerical model's channel arc injection energy is determined to be the critical value of the channel arc injection energy when the deviation is within the allowable range. This method solves the problem of the lack of a method for calculating the injection energy when the intermediate joint explodes in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A hardware structure block diagram of a mobile terminal according to a method for calculating a critical value of arc injection energy of an intermediate joint channel provided in an embodiment of the present application is shown;

[0019] Figure 2 A schematic flow chart of a method for calculating a critical value of arc injection energy in an intermediate joint channel according to an embodiment of the present application is shown;

[0020] Figure 3 A structural block diagram of a device for calculating a critical value of arc injection energy of an intermediate joint channel provided according to an embodiment of the present application is shown.

[0021] The above drawings include the following reference numerals:

[0022] 102. Processor; 104. Memory; 106. Transmission device; 108. Input / output device. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0026] As introduced in the background technology, in the field of explosion-proof design of intermediate joints of high-voltage cables in the prior art, there is an urgent need for a method for calculating the critical value of the injection energy of the channel arc in the intermediate joint to the copper mesh. In order to solve the problem that the prior art lacks a method for calculating the injection energy when the intermediate joint explodes, the embodiments of the present application provide a method, device, computer-readable storage medium and electronic device for calculating the critical value of the injection energy of the channel arc in the intermediate joint.

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0028] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for calculating the critical value of arc injection energy of an intermediate joint channel according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1Only one is shown) a processor 102 (the processor 102 may include but is not limited to a microprocessor MCU or a programmable logic device FPGA and other processing devices) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input and output device 108 for communication functions. It will be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the mobile terminal. Figure 1 More or fewer components than shown, or with Figure 1 Different configurations shown.

[0029] The memory 104 can be used to store computer programs, such as software programs and modules of application software, such as the computer program corresponding to the device information display method in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, implementing the above-mentioned method. The memory 104 may include a high-speed random access memory and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the above-mentioned networks include but are not limited to the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the above-mentioned network may include a wireless network provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, abbreviated as NIC), which can be connected to other network devices via a base station to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0030] In this embodiment, a method for calculating the critical value of the arc injection energy of the intermediate joint channel running on a mobile terminal, a computer terminal or a similar computing device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0031] Figure 2 Flowchart of the method for calculating the critical value of arc injection energy of the intermediate joint channel according to the embodiment of the present application. Figure 2As shown, the method includes the following steps:

[0032] Step S201, obtaining first target parameters, and calculating the injection heat of the copper mesh according to the first target parameters to obtain a first injection heat, wherein the first target parameters at least include current density, current, and radius of the channel arc;

[0033] In the specific implementation, the relevant parameters of the copper mesh are first obtained and a numerical model is constructed, which includes constructing a geometric model in the numerical model based on the collective structure of the copper mesh to ensure that the collective model is consistent with the actual sample. In addition, the material parameters of the actual sample are consistent with the numerical model.

[0034] Specifically, the Joule heat effect and arc heat transfer effect in the heat source received by the copper mesh are calculated through the numerical model based on relevant parameters of the channel arc, that is, the first target parameters, to obtain the first injected heat.

[0035] Step S202, obtaining a second target parameter, calculating the heat conduction process of the copper mesh according to the first injected heat and the second target parameter to obtain a transient temperature distribution of the copper mesh, wherein the second target parameter includes at least the density and specific heat capacity of the copper mesh;

[0036] Specifically, in order to simulate the damage of the copper mesh caused by the energy injected by the channel arc during the breakdown of the intermediate joint, in addition to considering the heat injected into the copper mesh by the channel current of the intermediate joint, the heat conduction and phase change effect in the copper mesh must also be considered. Specifically, through the above numerical model, based on the material parameters of the copper mesh, that is, the above second target parameters, the temperature distribution of the copper mesh during the heat conduction process in the copper mesh is calculated to obtain the above transient temperature distribution of the copper mesh.

[0037] Step S203, determining the damage area and damage depth of the copper mesh according to the transient temperature distribution of the copper mesh, obtaining a first damage area and a first damage depth, obtaining the actual damage area and actual damage depth of the copper mesh, and obtaining a second damage area and a second damage depth;

[0038] Specifically, the numerical model, based on the transient temperature distribution of the copper mesh and a preset phase transition temperature threshold of the copper mesh, can be used to determine the damage area and damage depth of the copper mesh. Specifically, the portion of the copper mesh whose temperature exceeds the phase transition temperature threshold is considered damaged, resulting in the first damage area and the first damage depth. The damage area and the damage depth of the actual sample are then measured to obtain the second damage area and the second damage depth.

[0039] Step S204: Calculate the difference between the first damage area and the second damage area to obtain a first deviation; calculate the difference between the first damage depth and the second damage depth to obtain a second deviation; and when both the first deviation and the second deviation are less than or equal to the first threshold, calculate the injection energy of the arc of the intermediate joint channel into the copper mesh according to the second target parameter to obtain an energy critical value.

[0040] Specifically, the damage area and damage depth are determined as damage characteristic parameters. Due to the randomness of the breakdown process of the intermediate joint, the same injection energy may cause different damage to the copper mesh. The present application is set to allow the calculated damage characteristic parameters to be less than the deviation between the damage characteristic parameters of the actual sample and the damage characteristic parameters of the actual sample. When the deviation is less than the above-mentioned first threshold (10%), the damage characteristics are determined to be consistent. At this time, the injection heat of the numerical model is determined, that is, the critical value of the channel arc injection energy is obtained, that is, the above-mentioned energy critical value. The specific formula is:

[0041] E=∫∫∫CρΔTdV;

[0042] Where E is the critical energy value, C is the specific heat capacity of the copper mesh, ρ is the density of the copper mesh, and ΔT is the transient temperature rise of the numerical model.

[0043] According to this embodiment, first, a first target parameter is obtained, and the injected heat of the copper mesh is calculated based on the first target parameter to obtain a first injected heat, wherein the first target parameter includes at least the current density, current and radius of the channel arc; then, a second target parameter is obtained, and the heat conduction process of the copper mesh is calculated based on the first injected heat and the second target parameter to obtain a transient temperature distribution of the copper mesh, wherein the second target parameter includes at least the density and specific heat capacity of the copper mesh; thereafter, the damage area and damage depth of the copper mesh are determined based on the transient temperature distribution of the copper mesh to obtain a first damage area and a first damage depth, and the actual damage area and actual damage depth of the copper mesh are obtained to obtain a second damage area and a second damage depth; finally, the difference between the first damage area and the second damage area is calculated to obtain a first deviation, and the difference between the first damage depth and the second damage depth is calculated to obtain a second deviation. When the first deviation and the second deviation are both less than or equal to the first threshold, the injected energy of the intermediate joint channel arc into the copper mesh is calculated based on the second target parameter to obtain an energy critical value. This application uses a numerical simulation method to calculate the heat source based on the measured channel arc of the broken intermediate joint based on a numerical model. The estimated damage area and damage depth of the copper mesh are calculated based on the phase change effect under the high temperature of the copper mesh, and then compared with the actual damage area and actual damage depth. The numerical model's channel arc injection energy is determined to be the critical value of the channel arc injection energy when the deviation is within the allowable range. This method solves the problem of the lack of a method for calculating the injection energy when the intermediate joint explodes in the prior art.

[0044] In order to calculate the first input energy, in an optional embodiment, the step S201 includes:

[0045] Step S2011, obtaining a target electric field and a preset volume, and calculating the Joule heat injected into the copper mesh by the channel arc based on the target electric field and the preset volume to obtain a second injected heat amount, wherein the target electric field is the electric field inside the copper mesh;

[0046] Specifically, under the influence of the channel arc injection energy of the middle joint, the heat sources received by the copper mesh include Joule heating effect and arc heat transfer effect. The Joule heating effect can be calculated through electrothermal coupling, that is, the electric field l inside the copper mesh is calculated through a numerical model to obtain the above-mentioned target electric field, and the Joule heat generated by the channel arc injection energy is calculated within a given volume, that is, the above-mentioned preset volume to obtain the above-mentioned second injection heat.

[0047] Step S2012, obtaining a target current, a preset coefficient, and a target radius, and calculating a boundary heat source of the channel arc input into the copper mesh based on the target current, the preset coefficient, and the target radius to obtain a third amount of injected heat, wherein the target current is the current of the channel arc, and the target radius is the radius of the channel arc;

[0048] Specifically, on the other hand, based on the heat transfer effect of the channel arc, that is, the calculation of the boundary heat source injected by the channel arc can be simulated by the boundary heat source of the traditional physical model of injected energy. Specifically, the current value, time, distance from the center of the channel arc and the radius of the channel arc are calculated to obtain the above-mentioned third injected heat.

[0049] Step S2013: summing the second injected heat and the third injected heat to obtain the first injected heat.

[0050] Specifically, the second injected heat amount and the third injected heat amount are summed to obtain the total injected heat of the numerical model, that is, the first injected heat amount.

[0051] In order to obtain the second injected heat, in an optional embodiment, the step S2011 includes:

[0052] Step S20111, determining the current density of the copper mesh within the preset volume according to the preset volume to obtain a target current density;

[0053] Specifically, based on electrothermal coupling, the electric field l inside the copper mesh is calculated, and then the current density J within a given volume V is calculated to obtain the above-mentioned target current density.

[0054] Step S20112: Substitute the target current density, the preset volume, and the target electric field into the first target formula to calculate the power and obtain the injected power:

[0055] P = ∫ V lJdV;

[0056] Wherein, l is the target electric field, V is the preset volume, P is the injection power, and J is the target current density;

[0057] Specifically, the Joule heat power P, ie, the injection power, can be calculated by combining the target current density J, the preset volume V, and the target electric field l.

[0058] Step S20113: Substitute the injected power into the second target formula to obtain the second injected heat:

[0059]

[0060] Wherein, W is the second injected heat, and T is the action time of the channel arc.

[0061] Specifically, the power P is integrated on a time scale to obtain the work done by Joule heat, that is, the second injected heat W is obtained.

[0062] In order to calculate the third injected heat, in an optional embodiment, the step S2012 includes:

[0063] Step S20121: Substitute the target current, the preset coefficient, and the target radius into a third target formula to calculate the third injected heat:

[0064]

[0065] Among them, Q is the above-mentioned third injected heat, a is the above-mentioned preset coefficient, which is used to characterize the degree of influence of the above-mentioned channel arc on the above-mentioned boundary heat source, r is the point with a distance r from the center of the above-mentioned channel arc, I(t) is the above-mentioned target current, R(t) is the above-mentioned target radius, and t is the acquisition time.

[0066] Specifically, for the boundary heat source injected by the channel arc, only a preliminary calculation is performed here to obtain an estimated value, which allows for deviations, and then the calculation of the third injected heat can be achieved based on the above formula.

[0067] In practice, the coefficient a comprehensively considers the contribution of electrons to the boundary heat source. In the traditional boundary heat source formula, its value is 10. This coefficient is positively correlated with the boundary heat source. By adjusting the value of coefficient a, the boundary heat source injected by the channel arc can be changed, thereby adjusting the damage characteristic parameters.

[0068] In order to calculate the transient temperature distribution of the copper mesh, in an optional embodiment, the step S202 includes:

[0069] Step S2021, obtaining a target density, a target specific heat capacity, a target heat transfer coefficient, and a first target temperature, wherein the target density is the density of the copper mesh, the target specific heat capacity is the specific heat capacity of the copper mesh, the target heat transfer coefficient is the heat transfer coefficient of the copper mesh, the target electrical conductivity is the electrical conductivity of the copper mesh, and the first target temperature is the initial temperature of the copper mesh;

[0070] In the embodiments of the present application, in order to ensure the accuracy of the above numerical model, in addition to considering the heat conduction of the injected heat in the copper mesh, the present application also introduces the phase change effect of the copper mesh. For the simulation of the phase change effect of the copper mesh, the present application adopts the reduced specific heat capacity method.

[0071] Specifically, the density ρ, specific heat capacity C, heat transfer coefficient k, and initial temperature θ of the copper mesh are obtained.

[0072] In a specific implementation, obtaining the above target specific heat capacity includes:

[0073] Substitute the above temperature change, specific heat capacity and latent heat of fusion into the fourth objective formula to calculate the equivalent specific heat capacity:

[0074]

[0075] Among them, C eq_melt is the above-mentioned equivalent specific heat capacity, L is the above-mentioned latent heat of fusion, C is the above-mentioned specific heat capacity, and dθ is the above-mentioned temperature change.

[0076] Furthermore, when the copper mesh is less than θ melt -Δθ (close to the melting point but not yet reached the melting point), the same specific heat capacity is used. melt -Δθ increases to θ melt (melting point), the additional heat required to melt the copper mesh needs to be considered. eq_melt Replace the original specific heat capacity to introduce latent heat of melting.

[0077] Step S2022: construct a heat conduction equation based on the target density, the target specific heat capacity, the target heat transfer coefficient, the target electrical conductivity, and the first target temperature:

[0078]

[0079] Where ρ is the target density, C is the target specific heat, and dθ is the temperature change. is the gradient operator, k is the target heat transfer coefficient, θ is the initial temperature, and M satisfies M=Q+W;

[0080] Specifically, the heat conduction equation is constructed by simulating the heat conduction of the input heat in the copper mesh based on the target density, the target specific heat capacity, the target heat transfer coefficient, the target electrical conductivity and the first target temperature through a numerical model.

[0081] Step S2023, obtaining a target mass and a target latent heat, wherein the target mass is the mass of the copper mesh, and the target latent heat is the latent heat of phase change of the copper mesh;

[0082] Specifically, the target mass m and the target latent heat L are acquired.

[0083] Step S2024: construct a phase change equation based on the target mass and the target latent heat:

[0084]

[0085] Wherein, m is the target mass and L is the target latent heat;

[0086] Specifically, based on the target mass and the target latent heat, a numerical model is used to simulate the phase change effect in the copper mesh caused by the input heat, and the phase change equation is constructed.

[0087] Step S2025: Simultaneously solve the heat conduction equation and the phase change equation to obtain the transient temperature distribution of the copper mesh.

[0088] Specifically, by simultaneously solving the above heat conduction equation and the above phase change equation, the changed temperature at any position of the copper mesh can be obtained, and the above transient temperature distribution of the copper mesh can be obtained.

[0089] In order to determine the first damage area and the first damage depth, in an optional embodiment, step S203 includes:

[0090] Step S2031, constructing a three-dimensional rectangular coordinate system with any position of the copper mesh as the origin, and traversing the temperature of each position of the copper mesh in the three-dimensional rectangular coordinate system to obtain a second target temperature;

[0091] Specifically, a coordinate system is established at the location of the copper mesh through a numerical model, the coordinates of the copper mesh in the coordinate system are determined, and each point is traversed to determine its corresponding changed temperature to obtain the above-mentioned second target temperature.

[0092] Step S2032: If the second target temperature is greater than or equal to a second threshold, the corresponding position is determined as a damaged position; if the second target temperature is less than the second threshold, the corresponding position is determined as an undamaged position;

[0093] Specifically, each point in the copper network is traversed, and when the second target temperature is greater than or equal to the second threshold, the corresponding position is determined as a damaged position; when the second target temperature is less than the second threshold, the corresponding position is determined as an undamaged position.

[0094] Step S2033: determining the first damage area and the first damage depth according to the damaged position and the undamaged position.

[0095] Specifically, the portion of all the damaged positions located at the copper mesh outline constitutes the first damaged area, and then all damaged parts are dug out and the maximum value of the depth change is compared to obtain the first damage depth.

[0096] To ensure the accuracy of the numerical model, in an optional embodiment, after calculating the difference between the first damage area and the second damage area to obtain the first deviation, and calculating the difference between the first damage depth and the second damage depth to obtain the second deviation, the method further includes:

[0097] Step S301 : When the first deviation or the second deviation is greater than the first threshold, the preset coefficient is increased with a preset gradient and the first deviation and the second deviation are recalculated until both the first deviation and the second deviation are less than or equal to the first threshold.

[0098] Specifically, when the damage characteristic parameter in the numerical model is smaller than the damage characteristic parameter of the actual sample, the preset coefficient is increased, and the gradient is set to 1. Each time the preset coefficient changes, the damage characteristic parameter is recalculated.

[0099] Furthermore, if the damage characteristic parameter in the numerical model is greater than the damage characteristic parameter of the actual sample, the above-mentioned preset coefficient is reduced, and the gradient is set to 1. Every time the preset coefficient changes, the above-mentioned damage characteristic parameter is recalculated.

[0100] Repeat the adjustment of the preset coefficients until the above damage characteristics are consistent, and determine that the simulation accuracy of the numerical model for the effect of the arc injection energy in the middle joint channel on the copper mesh meets the requirements.

[0101] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0102] The embodiment of the present application also provides a critical value calculation device for the arc injection energy of the intermediate joint channel. It should be noted that the critical value calculation device for the arc injection energy of the intermediate joint channel of the embodiment of the present application can be used to execute the critical value calculation method for the arc injection energy of the intermediate joint channel provided by the embodiment of the present application. The device is used to implement the above-mentioned embodiments and preferred implementation methods, and the details that have been explained will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware for a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceived.

[0103] The following introduces the critical value calculation device of the arc injection energy of the intermediate joint channel provided in the embodiment of the present application.

[0104] Figure 3: is a structural block diagram of a device for calculating the critical value of arc injection energy of an intermediate joint channel according to an embodiment of the present application. Figure 3 As shown, the device includes:

[0105] A first acquisition unit 10 is configured to acquire first target parameters, and calculate the injected heat of the copper mesh according to the first target parameters to obtain a first injected heat. The first target parameters include at least the current density, current, and radius of the channel arc.

[0106] In the specific implementation, the relevant parameters of the copper mesh are first obtained and a numerical model is constructed, which includes constructing a geometric model in the numerical model based on the collective structure of the copper mesh to ensure that the collective model is consistent with the actual sample. In addition, the material parameters of the actual sample are consistent with the numerical model.

[0107] Specifically, the Joule heat effect and arc heat transfer effect in the heat source received by the copper mesh are calculated through the numerical model based on relevant parameters of the channel arc, that is, the first target parameters, to obtain the first injected heat.

[0108] a second acquisition unit 20 for acquiring a second target parameter, calculating the heat conduction process of the copper mesh according to the first injected heat and the second target parameter to obtain a transient temperature distribution of the copper mesh, wherein the second target parameter includes at least the density and specific heat capacity of the copper mesh;

[0109] Specifically, in order to simulate the damage of the copper mesh caused by the energy injected by the channel arc during the breakdown of the intermediate joint, in addition to considering the heat injected into the copper mesh by the channel current of the intermediate joint, the heat conduction and phase change effect in the copper mesh must also be considered. Specifically, through the above numerical model, based on the material parameters of the copper mesh, that is, the above second target parameters, the temperature distribution of the copper mesh during the heat conduction process in the copper mesh is calculated to obtain the above transient temperature distribution of the copper mesh.

[0110] a first calculation unit 30 for determining a damage area and a damage depth of the copper mesh according to the transient temperature distribution of the copper mesh, obtaining a first damage area and a first damage depth, obtaining an actual damage area and an actual damage depth of the copper mesh, and obtaining a second damage area and a second damage depth;

[0111] Specifically, the numerical model, based on the transient temperature distribution of the copper mesh and a preset phase transition temperature threshold of the copper mesh, can be used to determine the damage area and damage depth of the copper mesh. Specifically, the portion of the copper mesh whose temperature exceeds the phase transition temperature threshold is considered damaged, resulting in the first damage area and the first damage depth. The damage area and the damage depth of the actual sample are then measured to obtain the second damage area and the second damage depth.

[0112] The second calculation unit 40 is used to calculate the difference between the above-mentioned first damage area and the above-mentioned second damage area to obtain a first deviation, calculate the difference between the above-mentioned first damage depth and the above-mentioned second damage depth to obtain a second deviation, and when the above-mentioned first deviation and the above-mentioned second deviation are both less than or equal to the first threshold, calculate the injection energy of the above-mentioned intermediate joint channel arc into the above-mentioned copper mesh according to the above-mentioned second target parameter to obtain an energy critical value.

[0113] Specifically, the damage area and damage depth are determined as damage characteristic parameters. Due to the randomness of the breakdown process of the intermediate joint, the same injection energy may cause different damage to the copper mesh. The present application is set to allow the calculated damage characteristic parameters to be less than the deviation between the damage characteristic parameters of the actual sample and the damage characteristic parameters of the actual sample. When the deviation is less than the above-mentioned first threshold (10%), the damage characteristics are determined to be consistent. At this time, the injection heat of the numerical model is determined, that is, the critical value of the channel arc injection energy is obtained, that is, the above-mentioned energy critical value. The specific formula is:

[0114] E=∫∫∫CρΔTdV;

[0115] Where E is the critical energy value, C is the specific heat capacity of the copper mesh, ρ is the density of the copper mesh, and ΔT is the transient temperature rise of the numerical model.

[0116] According to this embodiment, the first acquisition unit acquires a first target parameter, calculates the injected heat of the copper mesh according to the first target parameter to obtain a first injected heat, wherein the first target parameter includes at least the current density, current, and radius of the channel arc; the second acquisition unit acquires a second target parameter, calculates the heat conduction process of the copper mesh according to the first injected heat and the second target parameter to obtain a transient temperature distribution of the copper mesh, wherein the second target parameter includes at least the density and specific heat capacity of the copper mesh; the first calculation unit determines the damage area and damage depth of the copper mesh according to the transient temperature distribution of the copper mesh to obtain a first damage area and a first damage depth, acquires the actual damage area and actual damage depth of the copper mesh to obtain a second damage area and a second damage depth; the second calculation unit calculates the difference between the first damage area and the second damage area to obtain a first deviation, calculates the difference between the first damage depth and the second damage depth to obtain a second deviation, and when the first deviation and the second deviation are both less than or equal to the first threshold, calculates the injected energy of the intermediate joint channel arc into the copper mesh according to the second target parameter to obtain an energy critical value. This application uses a numerical simulation method to calculate the heat source based on the measured channel arc of the broken intermediate joint based on a numerical model. The estimated damage area and damage depth of the copper mesh are calculated based on the phase change effect under the high temperature of the copper mesh, and then compared with the actual damage area and actual damage depth. The numerical model's channel arc injection energy is determined to be the critical value of the channel arc injection energy when the deviation is within the allowable range. This method solves the problem of the lack of a method for calculating the injection energy when the intermediate joint explodes in the prior art.

[0117] In order to calculate the first input energy, in an optional embodiment, the first obtaining unit includes:

[0118] a first acquisition module, configured to acquire a target electric field and a preset volume, and calculate the Joule heat injected into the copper mesh by the channel arc based on the target electric field and the preset volume to obtain a second injected heat amount, wherein the target electric field is the electric field inside the copper mesh;

[0119] Specifically, under the influence of the channel arc injection energy of the middle joint, the heat sources received by the copper mesh include Joule heating effect and arc heat transfer effect. The Joule heating effect can be calculated through electrothermal coupling, that is, the electric field l inside the copper mesh is calculated through a numerical model to obtain the above-mentioned target electric field, and the Joule heat generated by the channel arc injection energy is calculated within a given volume, that is, the above-mentioned preset volume to obtain the above-mentioned second injection heat.

[0120] a second acquisition module, configured to acquire a target current, a preset coefficient, and a target radius, and calculate a boundary heat source of the channel arc input into the copper mesh based on the target current, the preset coefficient, and the target radius to obtain a third amount of injected heat, wherein the target current is the current of the channel arc, and the target radius is the radius of the channel arc;

[0121] Specifically, on the other hand, based on the heat transfer effect of the channel arc, that is, the calculation of the boundary heat source injected by the channel arc can be simulated by the boundary heat source of the traditional physical model of injected energy. Specifically, the current value, time, distance from the center of the channel arc and the radius of the channel arc are calculated to obtain the above-mentioned third injected heat.

[0122] The first calculation unit is used to sum the second injected heat and the third injected heat to obtain the first injected heat.

[0123] Specifically, the second injected heat amount and the third injected heat amount are summed to obtain the total injected heat of the numerical model, that is, the first injected heat amount.

[0124] In order to obtain the second injected heat, in an optional embodiment, the first acquisition module includes:

[0125] A first calculation submodule is configured to determine the current density of the copper mesh within the preset volume according to the preset volume to obtain a target current density;

[0126] Specifically, based on electrothermal coupling, the electric field l inside the copper mesh is calculated, and then the current density J within a given volume V is calculated to obtain the above-mentioned target current density.

[0127] The second calculation submodule is used to substitute the target current density, the preset volume, and the target electric field into the first target formula to calculate the power and obtain the injected power:

[0128] P = ∫ V lJdV;

[0129] Wherein, l is the target electric field, V is the preset volume, P is the injection power, and J is the target current density;

[0130] Specifically, the Joule heat power P, ie, the injection power, can be calculated by combining the target current density J, the preset volume V, and the target electric field l.

[0131] The second calculation submodule is used to substitute the above-mentioned injection power into the second target formula to obtain the above-mentioned second injection heat:

[0132]

[0133] Wherein, W is the second injected heat, and T is the action time of the channel arc.

[0134] Specifically, the power P is integrated on a time scale to obtain the work done by Joule heat, that is, the second injected heat W is obtained.

[0135] In order to calculate the third injected heat, in an optional embodiment, the second acquisition module includes:

[0136] The third calculation submodule is configured to substitute the target current, the preset coefficient, and the target radius into a third target formula to calculate the third injected heat:

[0137]

[0138] Among them, Q is the above-mentioned third injected heat, a is the above-mentioned preset coefficient, which is used to characterize the degree of influence of the above-mentioned channel arc on the above-mentioned boundary heat source, r is the point with a distance r from the center of the above-mentioned channel arc, I(t) is the above-mentioned target current, R(t) is the above-mentioned target radius, and t is the acquisition time.

[0139] Specifically, for the boundary heat source injected by the channel arc, only a preliminary calculation is performed here to obtain an estimated value, which allows for deviations, and then the calculation of the third injected heat can be achieved based on the above formula.

[0140] In practice, the coefficient a comprehensively considers the contribution of electrons to the boundary heat source. In the traditional boundary heat source formula, its value is 10. This coefficient is positively correlated with the boundary heat source. By adjusting the value of coefficient a, the boundary heat source injected by the channel arc can be changed, thereby adjusting the damage characteristic parameters.

[0141] In order to calculate the transient temperature distribution of the copper mesh, in an optional embodiment, the second acquisition unit includes:

[0142] a third acquisition module, configured to acquire a target density, a target specific heat capacity, a target heat transfer coefficient, and a first target temperature, wherein the target density is the density of the copper mesh, the target specific heat capacity is the specific heat capacity of the copper mesh, the target heat transfer coefficient is the heat transfer coefficient of the copper mesh, the target electrical conductivity is the electrical conductivity of the copper mesh, and the first target temperature is the initial temperature of the copper mesh;

[0143] In the embodiments of the present application, in order to ensure the accuracy of the above numerical model, in addition to considering the heat conduction of the injected heat in the copper mesh, the present application also introduces the phase change effect of the copper mesh. For the simulation of the phase change effect of the copper mesh, the present application adopts the reduced specific heat capacity method.

[0144] Specifically, the density ρ, specific heat capacity C, heat transfer coefficient k, and initial temperature θ of the copper mesh are obtained.

[0145] In a specific implementation, obtaining the above target specific heat capacity includes:

[0146] Substitute the above temperature change, specific heat capacity and latent heat of fusion into the fourth objective formula to calculate the equivalent specific heat capacity:

[0147]

[0148] Among them, C eq_melt is the above-mentioned equivalent specific heat capacity, L is the above-mentioned latent heat of fusion, C is the above-mentioned specific heat capacity, and dθ is the above-mentioned temperature change.

[0149] Furthermore, when the copper mesh is less than θ melt -Δθ (close to the melting point but not yet reached the melting point) is the same as the original specific heat capacity. melt -Δθ increases to θ melt (melting point), the additional heat required to melt the copper mesh needs to be considered. eq_melt Replace the original specific heat capacity to introduce latent heat of melting.

[0150] The second calculation module is used to construct a heat conduction equation according to the target density, the target specific heat capacity, the target heat transfer coefficient, the target conductivity and the first target temperature:

[0151]

[0152] Where ρ is the target density, C is the target specific heat, and dθ is the temperature change. is the gradient operator, k is the target heat transfer coefficient, θ is the initial temperature, and M satisfies M=Q+W;

[0153] Specifically, the heat conduction equation is constructed by simulating the heat conduction of the input heat in the copper mesh based on the target density, the target specific heat capacity, the target heat transfer coefficient, the target electrical conductivity and the first target temperature through a numerical model.

[0154] a fourth acquisition module, configured to acquire a target mass and a target latent heat, wherein the target mass is the mass of the copper mesh, and the target latent heat is the latent heat of phase change of the copper mesh;

[0155] Specifically, the target mass m and the target latent heat L are acquired.

[0156] The third calculation module is used to construct a phase change equation based on the target mass and the target latent heat:

[0157]

[0158] Wherein, m is the target mass and L is the target latent heat;

[0159] Specifically, based on the target mass and the target latent heat, a numerical model is used to simulate the phase change effect in the copper mesh caused by the input heat, and the phase change equation is constructed.

[0160] The fourth calculation module is used to simultaneously solve the above-mentioned heat conduction equation and the above-mentioned phase change equation to obtain the above-mentioned transient temperature distribution of the copper mesh.

[0161] Specifically, by simultaneously solving the above heat conduction equation and the above phase change equation, the changed temperature at any position of the copper mesh can be obtained, and the above transient temperature distribution of the copper mesh can be obtained.

[0162] In order to determine the first damage area and the first damage depth, in an optional embodiment, the first calculation unit includes:

[0163] A first determining module is configured to construct a three-dimensional rectangular coordinate system with any position of the copper mesh as an origin, and traverse the temperature of each position of the copper mesh in the three-dimensional rectangular coordinate system to obtain a second target temperature;

[0164] Specifically, a coordinate system is established at the location of the copper mesh through a numerical model, the coordinates of the copper mesh in the coordinate system are determined, and each point is traversed to determine its corresponding changed temperature to obtain the above-mentioned second target temperature.

[0165] a second determining module, configured to determine the corresponding position as a damaged position when the second target temperature is greater than or equal to a second threshold, and to determine the corresponding position as an undamaged position when the second target temperature is less than the second threshold;

[0166] Specifically, each point in the copper network is traversed, and when the second target temperature is greater than or equal to the second threshold, the corresponding position is determined as a damaged position; when the second target temperature is less than the second threshold, the corresponding position is determined as an undamaged position.

[0167] The third determining module is used to determine the first damage area and the first damage depth according to the damaged position and the undamaged position.

[0168] Specifically, the portion of all the damaged positions located at the copper mesh outline constitutes the first damaged area, and then all damaged parts are dug out and the maximum value of the depth change is compared to obtain the first damage depth.

[0169] In order to ensure the accuracy of the numerical model, in an optional embodiment, the above-mentioned device further includes:

[0170] The third calculation unit is used to calculate the difference between the first damage area and the second damage area to obtain the first deviation, calculate the difference between the first damage depth and the second damage depth to obtain the second deviation, and then, when the first deviation or the second deviation is greater than the first threshold, increase the preset coefficient with a preset gradient and recalculate the first deviation and the second deviation until both the first deviation and the second deviation are less than or equal to the first threshold.

[0171] Specifically, when the damage characteristic parameter in the numerical model is smaller than the damage characteristic parameter of the actual sample, the preset coefficient is increased, and the gradient is set to 1. Each time the preset coefficient changes, the damage characteristic parameter is recalculated.

[0172] Furthermore, if the damage characteristic parameter in the numerical model is greater than the damage characteristic parameter of the actual sample, the above-mentioned preset coefficient is reduced, and the gradient is set to 1. Every time the preset coefficient changes, the above-mentioned damage characteristic parameter is recalculated.

[0173] Repeat the adjustment of the preset coefficients until the above damage characteristics are consistent, and determine that the simulation accuracy of the numerical model for the effect of the arc injection energy in the middle joint channel on the copper mesh meets the requirements.

[0174] The device for calculating the critical value of arc injection energy in the intermediate joint channel includes a processor and a memory. The first acquisition unit, the second acquisition unit, the first calculation unit, and the second calculation unit are all stored as program units in the memory. The processor executes the program units stored in the memory to implement the corresponding functions. The modules are all located in the same processor; alternatively, the modules can be located in different processors in any combination.

[0175] The processor includes a core that retrieves the corresponding program unit from the memory. One or more cores can be set, and the energy injected into the copper mesh by the channel arc at the moment of the intermediate joint breakdown can be predicted by adjusting the core parameters.

[0176] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0177] An embodiment of the present invention provides a computer-readable storage medium, which includes a stored program, wherein when the program is running, the device where the computer-readable storage medium is located is controlled to execute the critical value calculation method of the arc injection energy of the intermediate joint channel.

[0178] Specifically, the method for calculating the critical value of the arc injection energy of the intermediate joint channel includes:

[0179] Step S201, obtaining first target parameters, and calculating the injection heat of the copper mesh according to the first target parameters to obtain a first injection heat, wherein the first target parameters at least include current density, current, and radius of the channel arc;

[0180] In the specific implementation, the relevant parameters of the copper mesh are first obtained and a numerical model is constructed, which includes constructing a geometric model in the numerical model based on the collective structure of the copper mesh to ensure that the collective model is consistent with the actual sample. In addition, the material parameters of the actual sample are consistent with the numerical model.

[0181] Specifically, the Joule heat effect and arc heat transfer effect in the heat source received by the copper mesh are calculated through the numerical model based on relevant parameters of the channel arc, that is, the first target parameters, to obtain the first injected heat.

[0182] Step S202, obtaining a second target parameter, calculating the heat conduction process of the copper mesh according to the first injected heat and the second target parameter to obtain a transient temperature distribution of the copper mesh, wherein the second target parameter includes at least the density and specific heat capacity of the copper mesh;

[0183] Specifically, in order to simulate the damage of the copper mesh caused by the energy injected by the channel arc during the breakdown of the intermediate joint, in addition to considering the heat injected into the copper mesh by the channel current of the intermediate joint, the heat conduction and phase change effect in the copper mesh must also be considered. Specifically, through the above numerical model, based on the material parameters of the copper mesh, that is, the above second target parameters, the temperature distribution of the copper mesh during the heat conduction process in the copper mesh is calculated to obtain the above transient temperature distribution of the copper mesh.

[0184] Step S203, determining the damage area and damage depth of the copper mesh according to the transient temperature distribution of the copper mesh, obtaining a first damage area and a first damage depth, obtaining the actual damage area and actual damage depth of the copper mesh, and obtaining a second damage area and a second damage depth;

[0185] Specifically, the numerical model, based on the transient temperature distribution of the copper mesh and a preset phase transition temperature threshold of the copper mesh, can be used to determine the damage area and damage depth of the copper mesh. Specifically, the portion of the copper mesh whose temperature exceeds the phase transition temperature threshold is considered damaged, resulting in the first damage area and the first damage depth. The damage area and the damage depth of the actual sample are then measured to obtain the second damage area and the second damage depth.

[0186] Step S204: Calculate the difference between the first damage area and the second damage area to obtain a first deviation; calculate the difference between the first damage depth and the second damage depth to obtain a second deviation; and when both the first deviation and the second deviation are less than or equal to the first threshold, calculate the injection energy of the arc of the intermediate joint channel into the copper mesh according to the second target parameter to obtain an energy critical value.

[0187] Specifically, the damage area and damage depth are determined as damage characteristic parameters. Due to the randomness of the breakdown process of the intermediate joint, the same injection energy may cause different damage to the copper mesh. The present application is set to allow the calculated damage characteristic parameters to be less than the deviation between the damage characteristic parameters of the actual sample and the damage characteristic parameters of the actual sample. When the deviation is less than the above-mentioned first threshold (10%), the damage characteristics are determined to be consistent. At this time, the injection heat of the numerical model is determined, that is, the critical value of the channel arc injection energy is obtained, that is, the above-mentioned energy critical value. The specific formula is:

[0188] E=∫∫∫CρΔTdV;

[0189] Where E is the critical energy value, C is the specific heat capacity of the copper mesh, ρ is the density of the copper mesh, and ΔT is the transient temperature rise of the numerical model.

[0190] An embodiment of the present invention provides a processor, which is used to run a program, wherein the program executes the critical value calculation method of the arc injection energy of the intermediate joint channel when running.

[0191] Specifically, the method for calculating the critical value of the arc injection energy of the intermediate joint channel includes:

[0192] Step S201, obtaining first target parameters, and calculating the injection heat of the copper mesh according to the first target parameters to obtain a first injection heat, wherein the first target parameters at least include current density, current, and radius of the channel arc;

[0193] In the specific implementation, the relevant parameters of the copper mesh are first obtained and a numerical model is constructed, which includes constructing a geometric model in the numerical model based on the collective structure of the copper mesh to ensure that the collective model is consistent with the actual sample. In addition, the material parameters of the actual sample are consistent with the numerical model.

[0194] Specifically, the Joule heat effect and arc heat transfer effect in the heat source received by the copper mesh are calculated through the numerical model based on relevant parameters of the channel arc, that is, the first target parameters, to obtain the first injected heat.

[0195] Step S202, obtaining a second target parameter, calculating the heat conduction process of the copper mesh according to the first injected heat and the second target parameter to obtain a transient temperature distribution of the copper mesh, wherein the second target parameter includes at least the density and specific heat capacity of the copper mesh;

[0196] Specifically, in order to simulate the damage of the copper mesh caused by the energy injected by the channel arc during the breakdown of the intermediate joint, in addition to considering the heat injected into the copper mesh by the channel current of the intermediate joint, the heat conduction and phase change effect in the copper mesh must also be considered. Specifically, through the above numerical model, based on the material parameters of the copper mesh, that is, the above second target parameters, the temperature distribution of the copper mesh during the heat conduction process in the copper mesh is calculated to obtain the above transient temperature distribution of the copper mesh.

[0197] Step S203, determining the damage area and damage depth of the copper mesh according to the transient temperature distribution of the copper mesh, obtaining a first damage area and a first damage depth, obtaining the actual damage area and actual damage depth of the copper mesh, and obtaining a second damage area and a second damage depth;

[0198] Specifically, the numerical model, based on the transient temperature distribution of the copper mesh and a preset phase transition temperature threshold of the copper mesh, can be used to determine the damage area and damage depth of the copper mesh. Specifically, the portion of the copper mesh whose temperature exceeds the phase transition temperature threshold is considered damaged, resulting in the first damage area and the first damage depth. The damage area and the damage depth of the actual sample are then measured to obtain the second damage area and the second damage depth.

[0199] Step S204: Calculate the difference between the first damage area and the second damage area to obtain a first deviation; calculate the difference between the first damage depth and the second damage depth to obtain a second deviation; and when both the first deviation and the second deviation are less than or equal to the first threshold, calculate the injection energy of the arc of the intermediate joint channel into the copper mesh according to the second target parameter to obtain an energy critical value.

[0200] Specifically, the damage area and damage depth are determined as damage characteristic parameters. Due to the randomness of the breakdown process of the intermediate joint, the same injection energy may cause different damage to the copper mesh. The present application is set to allow the calculated damage characteristic parameters to be less than the deviation between the damage characteristic parameters of the actual sample and the damage characteristic parameters of the actual sample. When the deviation is less than the above-mentioned first threshold (10%), the damage characteristics are determined to be consistent. At this time, the injection heat of the numerical model is determined, that is, the critical value of the channel arc injection energy is obtained, that is, the above-mentioned energy critical value. The specific formula is:

[0201] E=∫∫∫CρΔTdV;

[0202] Where E is the critical energy value, C is the specific heat capacity of the copper mesh, ρ is the density of the copper mesh, and ΔT is the transient temperature rise of the numerical model.

[0203] An embodiment of the present invention provides an electronic device, the electronic device including a processor, a memory, and a program stored in the memory and executable on the processor, wherein when the processor executes the program, at least the following steps are performed:

[0204] Step S201, obtaining first target parameters, and calculating the injection heat of the copper mesh according to the first target parameters to obtain a first injection heat, wherein the first target parameters at least include current density, current, and radius of the channel arc;

[0205] In the specific implementation, the relevant parameters of the copper mesh are first obtained and a numerical model is constructed, which includes constructing a geometric model in the numerical model based on the collective structure of the copper mesh to ensure that the collective model is consistent with the actual sample. In addition, the material parameters of the actual sample are consistent with the numerical model.

[0206] Specifically, the Joule heat effect and arc heat transfer effect in the heat source received by the copper mesh are calculated through the numerical model based on relevant parameters of the channel arc, that is, the first target parameters, to obtain the first injected heat.

[0207] Step S202, obtaining a second target parameter, calculating the heat conduction process of the copper mesh according to the first injected heat and the second target parameter to obtain a transient temperature distribution of the copper mesh, wherein the second target parameter includes at least the density and specific heat capacity of the copper mesh;

[0208] Specifically, in order to simulate the damage of the copper mesh caused by the energy injected by the channel arc during the breakdown of the intermediate joint, in addition to considering the heat injected into the copper mesh by the channel current of the intermediate joint, the heat conduction and phase change effect in the copper mesh must also be considered. Specifically, through the above numerical model, based on the material parameters of the copper mesh, that is, the above second target parameters, the temperature distribution of the copper mesh during the heat conduction process in the copper mesh is calculated to obtain the above transient temperature distribution of the copper mesh.

[0209] Step S203, determining the damage area and damage depth of the copper mesh according to the transient temperature distribution of the copper mesh, obtaining a first damage area and a first damage depth, obtaining the actual damage area and actual damage depth of the copper mesh, and obtaining a second damage area and a second damage depth;

[0210] Specifically, the numerical model, based on the transient temperature distribution of the copper mesh and a preset phase transition temperature threshold of the copper mesh, can be used to determine the damage area and damage depth of the copper mesh. Specifically, the portion of the copper mesh whose temperature exceeds the phase transition temperature threshold is considered damaged, resulting in the first damage area and the first damage depth. The damage area and the damage depth of the actual sample are then measured to obtain the second damage area and the second damage depth.

[0211] Step S204: Calculate the difference between the first damage area and the second damage area to obtain a first deviation; calculate the difference between the first damage depth and the second damage depth to obtain a second deviation; and when both the first deviation and the second deviation are less than or equal to the first threshold, calculate the injection energy of the arc of the intermediate joint channel into the copper mesh according to the second target parameter to obtain an energy critical value.

[0212] Specifically, the damage area and damage depth are determined as damage characteristic parameters. Due to the randomness of the breakdown process of the intermediate joint, the same injection energy may cause different damage to the copper mesh. The present application is set to allow the calculated damage characteristic parameters to be less than the deviation between the damage characteristic parameters of the actual sample and the damage characteristic parameters of the actual sample. When the deviation is less than the above-mentioned first threshold (10%), the damage characteristics are determined to be consistent. At this time, the injection heat of the numerical model is determined, that is, the critical value of the channel arc injection energy is obtained, that is, the above-mentioned energy critical value. The specific formula is:

[0213] E=∫∫∫CρΔTdV;

[0214] Where E is the critical energy value, C is the specific heat capacity of the copper mesh, ρ is the density of the copper mesh, and ΔT is the transient temperature rise of the numerical model.

[0215] The present application also provides a computer program product, which, when executed on a data processing device, is adapted to execute a program for initializing at least the following method steps:

[0216] Step S201, obtaining first target parameters, and calculating the injection heat of the copper mesh according to the first target parameters to obtain a first injection heat, wherein the first target parameters at least include current density, current, and radius of the channel arc;

[0217] In the specific implementation, the relevant parameters of the copper mesh are first obtained and a numerical model is constructed, which includes constructing a geometric model in the numerical model based on the collective structure of the copper mesh to ensure that the collective model is consistent with the actual sample. In addition, the material parameters of the actual sample are consistent with the numerical model.

[0218] Specifically, the Joule heat effect and arc heat transfer effect in the heat source received by the copper mesh are calculated through the numerical model based on relevant parameters of the channel arc, that is, the first target parameters, to obtain the first injected heat.

[0219] Step S202, obtaining a second target parameter, calculating the heat conduction process of the copper mesh according to the first injected heat and the second target parameter to obtain a transient temperature distribution of the copper mesh, wherein the second target parameter includes at least the density and specific heat capacity of the copper mesh;

[0220] Specifically, in order to simulate the damage of the copper mesh caused by the energy injected by the channel arc during the breakdown of the intermediate joint, in addition to considering the heat injected into the copper mesh by the channel current of the intermediate joint, the heat conduction and phase change effect in the copper mesh must also be considered. Specifically, through the above numerical model, based on the material parameters of the copper mesh, that is, the above second target parameters, the temperature distribution of the copper mesh during the heat conduction process in the copper mesh is calculated to obtain the above transient temperature distribution of the copper mesh.

[0221] Step S203, determining the damage area and damage depth of the copper mesh according to the transient temperature distribution of the copper mesh, obtaining a first damage area and a first damage depth, obtaining the actual damage area and actual damage depth of the copper mesh, and obtaining a second damage area and a second damage depth;

[0222] Specifically, the numerical model, based on the transient temperature distribution of the copper mesh and a preset phase transition temperature threshold of the copper mesh, can be used to determine the damage area and damage depth of the copper mesh. Specifically, the portion of the copper mesh whose temperature exceeds the phase transition temperature threshold is considered damaged, resulting in the first damage area and the first damage depth. The damage area and the damage depth of the actual sample are then measured to obtain the second damage area and the second damage depth.

[0223] Step S204: Calculate the difference between the first damage area and the second damage area to obtain a first deviation; calculate the difference between the first damage depth and the second damage depth to obtain a second deviation; and when both the first deviation and the second deviation are less than or equal to the first threshold, calculate the injection energy of the arc of the intermediate joint channel into the copper mesh according to the second target parameter to obtain an energy critical value.

[0224] Specifically, the damage area and damage depth are determined as damage characteristic parameters. Due to the randomness of the breakdown process of the intermediate joint, the same injection energy may cause different damage to the copper mesh. The present application is set to allow the calculated damage characteristic parameters to be less than the deviation between the damage characteristic parameters of the actual sample and the damage characteristic parameters of the actual sample. When the deviation is less than the above-mentioned first threshold (10%), the damage characteristics are determined to be consistent. At this time, the injection heat of the numerical model is determined, that is, the critical value of the channel arc injection energy is obtained, that is, the above-mentioned energy critical value. The specific formula is:

[0225] E=∫∫∫CρΔTdV;

[0226] Where E is the critical energy value, C is the specific heat capacity of the copper mesh, ρ is the density of the copper mesh, and ΔT is the transient temperature rise of the numerical model.

[0227] Obviously, those skilled in the art will appreciate that the various modules or steps of the present invention described above can be implemented using a general-purpose computing device, can be centralized on a single computing device, or can be distributed across a network of multiple computing devices. They can be implemented using program code executable by the computing device, and thus, can be stored in a storage device and executed by the computing device. In some cases, the steps shown or described herein can be performed in a different order than that shown, or can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0228] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0229] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0230] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0231] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0232] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0233] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0234] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic tape, disk storage or other magnetic storage devices, or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory media such as modulated data signals and carrier waves.

[0235] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0236] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0237] 1) The critical value calculation method of the arc injection energy of the intermediate joint channel of the present application, first, obtain a first target parameter, and calculate the injection heat of the copper mesh according to the first target parameter to obtain the first injection heat, wherein the first target parameter includes at least the current density, current and radius of the channel arc; then, obtain a second target parameter, and calculate the heat conduction process of the copper mesh according to the first injection heat and the second target parameter to obtain the transient temperature distribution of the copper mesh, wherein the second target parameter includes at least the density and specific heat capacity of the copper mesh; thereafter, determine the damage area and damage depth of the copper mesh according to the transient temperature distribution of the copper mesh to obtain the first damage area and the first damage depth, obtain the actual damage area and the actual damage depth of the copper mesh to obtain the second damage area and the second damage depth; finally, calculate the difference between the first damage area and the second damage area to obtain a first deviation, calculate the difference between the first damage depth and the second damage depth to obtain a second deviation, and when the first deviation and the second deviation are both less than or equal to the first threshold, calculate the injection energy of the intermediate joint channel arc into the copper mesh according to the second target parameter to obtain the energy critical value. This application uses a numerical simulation method to calculate the heat source based on the measured channel arc of the broken intermediate joint based on a numerical model. The estimated damage area and damage depth of the copper mesh are calculated based on the phase change effect under the high temperature of the copper mesh, and then compared with the actual damage area and actual damage depth. The numerical model's channel arc injection energy is determined to be the critical value of the channel arc injection energy when the deviation is within the allowable range. This method solves the problem of the lack of a method for calculating the injection energy when the intermediate joint explodes in the prior art.

[0238] 2) The critical value calculation device of the arc injection energy of the intermediate joint channel of the present application, the first acquisition unit acquires a first target parameter, calculates the injection heat of the copper mesh according to the above-mentioned first target parameter to obtain the first injection heat, and the above-mentioned first target parameter includes at least the current density, current and radius of the channel arc; the second acquisition unit acquires a second target parameter, calculates the heat conduction process of the above-mentioned copper mesh according to the above-mentioned first injection heat and the above-mentioned second target parameter, and obtains the transient temperature distribution of the copper mesh, and the above-mentioned second target parameter includes at least the density and specific heat capacity of the above-mentioned copper mesh; the first calculation unit determines the damage area and damage depth of the above-mentioned copper mesh according to the above-mentioned transient temperature distribution of the copper mesh, obtains the first damage area and the first damage depth, obtains the actual damage area and the actual damage depth of the above-mentioned copper mesh, and obtains the second damage area and the second damage depth; the second calculation unit calculates the difference between the above-mentioned first damage area and the above-mentioned second damage area to obtain a first deviation, calculates the difference between the above-mentioned first damage depth and the above-mentioned second damage depth to obtain a second deviation, and when the above-mentioned first deviation and the above-mentioned second deviation are both less than or equal to the first threshold, calculates the injection energy of the above-mentioned intermediate joint channel arc into the above-mentioned copper mesh according to the above-mentioned second target parameter to obtain the energy critical value. This application uses a numerical simulation method to calculate the heat source based on the measured channel arc of the broken intermediate joint based on a numerical model. The estimated damage area and damage depth of the copper mesh are calculated based on the phase change effect under the high temperature of the copper mesh, and then compared with the actual damage area and actual damage depth. The numerical model's channel arc injection energy is determined to be the critical value of the channel arc injection energy when the deviation is within the allowable range. This method solves the problem of the lack of a method for calculating the injection energy when the intermediate joint explodes in the prior art.

[0239] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A method for calculating the critical value of arc injection energy in an intermediate joint channel, characterized in that: The intermediate joint is wrapped with a copper mesh, and the method comprises: Acquiring first target parameters, and calculating the injection heat of the copper mesh according to the first target parameters to obtain a first injection heat, wherein the first target parameters at least include a current density, a current, and a radius of the channel arc; Obtaining a second target parameter, calculating a heat conduction process of the copper mesh according to the first injected heat and the second target parameter to obtain a transient temperature distribution of the copper mesh, wherein the second target parameter includes at least a density and a specific heat capacity of the copper mesh; Determining the damage area and damage depth of the copper mesh according to the transient temperature distribution of the copper mesh to obtain a first damage area and a first damage depth, obtaining the actual damage area and actual damage depth of the copper mesh to obtain a second damage area and a second damage depth; The difference between the first damage area and the second damage area is calculated to obtain a first deviation, and the difference between the first damage depth and the second damage depth is calculated to obtain a second deviation. When the first deviation and the second deviation are both less than or equal to a first threshold, the injection energy of the arc of the intermediate joint channel into the copper mesh is calculated according to the second target parameter to obtain an energy critical value.

2. The method according to claim 1, characterized in that Calculating the injected heat of the copper mesh according to the first target parameter to obtain a first injected heat includes: Obtaining a target electric field and a preset volume, and calculating the Joule heat injected into the copper mesh by the channel arc according to the target electric field and the preset volume to obtain a second injected heat amount, wherein the target electric field is the electric field inside the copper mesh; Obtaining a target current, a preset coefficient, and a target radius, and calculating a boundary heat source of the channel arc input into the copper mesh according to the target current, the preset coefficient, and the target radius to obtain a third injected heat amount, wherein the target current is the current of the channel arc, and the target radius is the radius of the channel arc; The second injected heat amount and the third injected heat amount are summed to obtain the first injected heat amount.

3. The method according to claim 2, characterized in that Calculating the Joule heat injected into the copper mesh by the channel arc according to the target electric field and the preset volume to obtain a second injection heat amount includes: Determining the current density of the copper mesh within the preset volume according to the preset volume to obtain a target current density; Substitute the target current density, the preset volume, and the target electric field into the first target formula to calculate the power to obtain the injection power: ； Wherein, l is the target electric field, V is the preset volume, P is the injection power, and J is the target current density; Substituting the injected power into the second target formula yields the second injected heat: ； Wherein, W is the second injected heat, and T is the action time of the channel arc.

4. The method according to claim 2, characterized in that Calculating a boundary heat source of the channel arc input into the copper mesh according to the target current, the preset coefficient, and the target radius to obtain a third injected heat amount includes: The target current, the preset coefficient, and the target radius are substituted into a third target formula to calculate the third injected heat: ； Wherein, Q is the third injected heat, a is the preset coefficient, which is used to characterize the degree of influence of the channel arc on the boundary heat source, and r is a point that is at a distance r from the center of the channel arc. is the target current, is the target radius, and t is the acquisition time.

5. The method according to claim 1, wherein Calculating the heat conduction process of the copper mesh according to the first injected heat and the second target parameter to obtain a transient temperature distribution of the copper mesh includes: Obtaining a target density, a target specific heat capacity, a target heat transfer coefficient, and a first target temperature, wherein the target density is the density of the copper mesh, the target specific heat capacity is the specific heat capacity of the copper mesh, the target heat transfer coefficient is the heat transfer coefficient of the copper mesh, the target electrical conductivity is the electrical conductivity of the copper mesh, and the first target temperature is the initial temperature of the copper mesh; A heat conduction equation is constructed according to the target density, the target specific heat capacity, the target heat transfer coefficient, the target conductivity, and the first target temperature: ； in, is the target density, is the target specific heat capacity, is the temperature change, is the gradient operator, is the target heat transfer coefficient, is the initial temperature, M satisfies , where Q is the third injected heat and W is the second injected heat; Obtaining a target mass and a target latent heat, wherein the target mass is the mass of the copper mesh, and the target latent heat is the latent heat of phase change of the copper mesh; The phase change equation is constructed according to the target mass and the target latent heat: ； Wherein, m is the target mass, L is the target latent heat; The heat conduction equation and the phase change equation are simultaneously solved to obtain the transient temperature distribution of the copper mesh.

6. The method according to claim 1, characterized in that Determining the damage area and damage depth of the copper mesh according to the transient temperature distribution of the copper mesh to obtain a first damage area and a first damage depth includes: Constructing a three-dimensional rectangular coordinate system with any position of the copper mesh as an origin, and traversing the temperature of each position of the copper mesh in the three-dimensional rectangular coordinate system to obtain a second target temperature; When the second target temperature is greater than or equal to a second threshold, the corresponding position is determined as a damaged position; when the second target temperature is less than the second threshold, the corresponding position is determined as an undamaged position; The first damaged area and the first damaged depth are determined according to the damaged position and the undamaged position.

7. The method according to claim 4, characterized in that After calculating the difference between the first damage area and the second damage area to obtain a first deviation, and calculating the difference between the first damage depth and the second damage depth to obtain a second deviation, the method further includes: When the first deviation or the second deviation is greater than the first threshold, the preset coefficient is increased with a preset gradient and the first deviation and the second deviation are recalculated until both the first deviation and the second deviation are less than or equal to the first threshold.

8. A device for calculating the critical value of arc injection energy in an intermediate joint channel, characterized in that: The intermediate joint is wrapped with a copper mesh, and the device comprises: a first acquiring unit, configured to acquire first target parameters, and calculate the injected heat of the copper mesh according to the first target parameters to obtain a first injected heat, wherein the first target parameters at least include a current density, a current, and a radius of the channel arc; a second acquisition unit, configured to acquire a second target parameter, and calculate the heat conduction process of the copper mesh according to the first injected heat and the second target parameter to obtain a transient temperature distribution of the copper mesh, wherein the second target parameter includes at least a density and a specific heat capacity of the copper mesh; a first calculation unit, configured to determine a damage area and a damage depth of the copper mesh according to the transient temperature distribution of the copper mesh, obtain a first damage area and a first damage depth, obtain an actual damage area and an actual damage depth of the copper mesh, and obtain a second damage area and a second damage depth; The second calculation unit is used to calculate the difference between the first damage area and the second damage area to obtain a first deviation, calculate the difference between the first damage depth and the second damage depth to obtain a second deviation, and when the first deviation and the second deviation are both less than or equal to the first difference, calculate the injection energy of the arc of the intermediate joint channel into the copper mesh according to the second target parameter to obtain an energy critical value.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the method according to any one of claims 1 to 7.

10. An electronic device, characterized in that: include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include instructions for executing the method of any one of claims 1 to 7.

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