Carbon ceramic resistor electrical property regulation and control method and system based on particle flow-finite element

Abstract

The invention belongs to the field of functional ceramic material performance regulation and control, and particularly discloses a particle flow-finite element-based carbon ceramic resistor electrical performance regulation and control method and system. According to the method, interaction force among particles, interface characteristics and force-thermal coupling characteristics under transient high-energy injection are considered, the real microstructure of the carbon ceramic resistor is modeled, and factors considered in the modeling process are wider; according to the method, the regulation and control of the target electrical performance are realized by finely adjusting the particle distribution in the particle arrangement mode, only the particle distribution in the particle arrangement mode matrix is finely adjusted in the regulation and control process, and the screening of a large number of invalid particle arrangement modes is avoided, so that the calculation amount of the model in the regulation and control process is reduced, and the simulation calculation time of the model is shortened; the electrical property regulation and control process based on structure fine tuning is realized by software, no other experimental material loss and equipment operation expenditure are caused, and the experimental cost expenditure of electrical property regulation and control and the time expenditure consumed by experimental firing of the carbon ceramic resistor are effectively avoided.

Description

Technical Field

[0001] This application belongs to the field of performance regulation of functional ceramic materials, and more specifically, relates to a method and system for regulating the resistive electrical properties of carbon ceramics based on particle flow-finite element method. Background Technology

[0002] Carbon ceramic resistors are widely used in energy absorption devices of high-voltage circuit breakers due to their excellent high-voltage and high-temperature resistance, high power carrying capacity, and high electrothermal stability. However, under transient high-energy injection, domestically produced carbon ceramic resistors face challenges such as uneven current distribution, local breakdown or surface flashover, and large resistance fluctuations. Their electrical performance is insufficient to meet the requirements for efficient and stable applications under extreme conditions, and further optimization and improvement of electrical performance are urgently needed. Existing methods for controlling the electrical performance of carbon ceramic resistors mainly include experimental iterative methods and control methods based on traditional carbon ceramic resistor microstructure models. However, neither method considers important influencing factors such as the internal microstructure of the carbon ceramic resistor and its structural interface characteristics. The lack of guidance from microstructure and interface characteristics may increase the complexity and reduce the reliability of the electrical performance control process. Therefore, it is urgent to propose an optimization and control approach for the electrical performance of carbon ceramic resistors that considers microstructure and interface characteristics.

[0003] Currently, there is a lack of accurate and effective models to quantify the mapping relationship between the internal microstructure and structural interface characteristics of carbon ceramic resistors and their macroscopic electrical performance. Traditional modeling approaches, represented by the finite element method (FEM), focus on the inherent characteristics between individual structures, neglecting the interactions between particles and interface properties. Furthermore, the modeling process does not consider the force-thermal coupling characteristics under transient high-energy injection, making it difficult for traditional FEM-based carbon ceramic resistor microstructure models to simulate their true particle arrangement. This hinders the implementation of simulation-based methods for optimizing and controlling the electrical performance of carbon ceramic resistors.

[0004] Therefore, there is an urgent need to develop a method for controlling the electrical performance of carbon ceramic resistors based on a realistic microstructure model. This method aims to control the target electrical performance through accurate modeling of the carbon ceramic resistor's microstructure. This approach will provide technical support for improving and optimizing the electrical performance of carbon ceramic resistors under transient high-energy injection, and is of great significance for studying the enhancement of the mechanical-thermal-electrical properties of carbon ceramic resistors. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this application is to provide a method and system for controlling the electrical properties of carbon ceramic resistivity based on particle flow-finite element method, aiming to solve the problem that existing electrical property control methods neglect interparticle interaction forces, interface characteristics, and force-thermal coupling characteristics under transient high energy injection.

[0006] To achieve the above objectives, in a first aspect, this application provides a method for controlling the resistive electrical properties of carbon ceramics based on particle flow-finite element method, comprising: Obtain the target electrical performance parameter values, and index the dataset of carbon ceramic resistive electrical performance with respect to different particle distributions based on the target electrical performance parameter values ​​to obtain the particle distribution that satisfies the target electrical performance; wherein, the dataset of carbon ceramic resistive electrical performance with respect to different particle distributions is obtained in the following way: S1. Based on the carbon ceramic resistor particle flow coding model and finite element model, the actual particle arrangement of carbon ceramic resistors is screened out, and the actual particle arrangement matrix is ​​constructed. S2. Extract the interface characteristic matrix containing interface interaction information from the particle flow coding model and the finite element model, and fine-tune the particle distribution in the real particle arrangement matrix. S3. Using the particle flow coding model corresponding to the fine-tuned particle arrangement matrix and the interface characteristic matrix corresponding to the real particle arrangement, the force and / or thermal properties of the carbon ceramic resistor corresponding to the fine-tuned particle arrangement matrix are simulated. S4. If the simulation results of the resistivity and / or thermal properties of carbon ceramic before and after fine-tuning are consistent, use the finite element model to simulate the electrical properties of the carbon ceramic resistor corresponding to the particle arrangement matrix after fine-tuning; otherwise, readjust the actual particle arrangement matrix and proceed to S3. S5. Repeat S3-S4 until a preset number of effective particle arrangement matrices are obtained; S6. Simulate the electrical performance of the carbon ceramic resistor corresponding to each effective particle arrangement matrix, extract the electrical performance corresponding to different particle distributions, and construct a dataset of the electrical performance of carbon ceramic resistors with respect to different particle distributions.

[0007] Preferably, the electrical performance parameters include at least one of the following: maximum withstand impulse voltage, number and length of local breakdown channels, current distribution characteristics, and maximum withstand power frequency voltage.

[0008] Preferably, the method for determining whether the target electrical performance is met is as follows: For the parameters mentioned in the target electrical performance, the criterion is that the corresponding parameters of the simulated electrical performance are not lower than the parameters mentioned in the target electrical performance. For parameters not mentioned in the target electrical performance, the criterion is that the corresponding parameters of the simulated electrical performance are not lower than the corresponding parameters of the original carbon ceramic resistive electrical performance.

[0009] Preferably, the construction of the real particle arrangement matrix is ​​specifically as follows: different types of particles are represented by digital codes, and the particle arrangement image is converted into a matrix representation.

[0010] Preferably, the fine-tuning of the particle distribution in the real particle arrangement matrix is ​​specifically as follows: the fine-tuning objects in the particle arrangement matrix are randomly adjusted, and the fine-tuning objects include the carbon particle distribution, ceramic particle distribution, and pore distribution.

[0011] Preferably, the fine-tuning method is to change the arrangement order of particles in the same row or the arrangement order of particles in the same column.

[0012] Preferably, the actual particle arrangement of the carbon ceramic resistor is screened based on the carbon ceramic resistor particle flow coding model and the finite element model, as follows: Initial screening of mechanical properties: Compare the simulated mechanical properties of the particle flow coding model with the measured mechanical properties, and screen out particle arrangement patterns that match the mechanical properties; Further screening of thermal performance: By comparing thermal performance, particle arrangement patterns that are consistent with the microstructure of the particle flow coding model and the finite element model were selected. Final selection of electrical performance: Compare the simulated electrical performance of the finite element model with the measured electrical performance, and select the particle arrangement that matches the electrical performance as the true particle arrangement of the carbon ceramic resistor.

[0013] Preferably, the interface characteristic matrix includes four basic constants: interface resistance, interface thermal expansion coefficient, interface bonding strength, and actual contact area.

[0014] Preferably, the finite element model of the carbon ceramic resistor simulates its electrical performance as follows: The particle arrangement matrix is ​​converted into an irregular polygonal structure using a Voronoi diagram; Import the irregular polygonal structure into the finite element model, select transient electric field and current field as the physical field interface, and set the material properties of carbon particles, ceramic particles and pores. One side of the carbon ceramic resistor is set as the terminal, and the other side is set as the ground terminal. Transient current excitation or transient voltage excitation under actual operating conditions is applied to the terminal. The electrical properties of carbon ceramic resistors are solved by mesh generation, and the electrical performance parameters are extracted.

[0015] To achieve the above objectives, in a second aspect, this application provides a carbon ceramic resistive electrical performance control system based on particle flow-finite element method, comprising: at least one memory for storing a program; and at least one processor for accessing the program stored in the memory, wherein when the program stored in the memory is accessed, the processor is used to access the electrical performance control method as described in the first aspect.

[0016] It is understandable that the beneficial effects of the second aspect mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here.

[0017] Overall, the technical solutions conceived in this application have the following beneficial effects compared with the prior art: This application provides a method for controlling the electrical performance of carbon ceramic resistors based on particle flow-finite element method. It considers interparticle interaction forces, interface characteristics, and the force-thermal coupling characteristics under transient high-energy injection to model the true microstructure of the carbon ceramic resistor. Compared to traditional carbon ceramic resistor microstructure models, this application considers a wider range of factors in its modeling process. The target electrical performance is controlled by fine-tuning the particle distribution in the particle arrangement matrix. This process avoids filtering out a large number of invalid particle arrangements, thus reducing the computational load and shortening the simulation time. The electrical performance control process based on structural fine-tuning is software-based, eliminating the need for additional experimental material consumption and equipment operating costs. Compared to experimental iteration-based control methods, this effectively avoids the experimental costs of electrical performance control and the time spent on experimentally firing carbon ceramic resistors. Attached Figure Description

[0018] Figure 1 This is a flowchart of a method for controlling the electrical properties of carbon ceramic resistivity based on particle flow-finite element method, provided in an embodiment of this application.

[0019] Figure 2 This is a schematic diagram of the current distribution characteristics derived from the measured thermal distribution map provided in this application embodiment.

[0020] Figure 3 This is a schematic diagram of the particle arrangement provided in the embodiments of this application converted into matrix form.

[0021] Figure 4 This is a schematic diagram of two fine-tuning methods for the particle arrangement matrix provided in the embodiments of this application.

[0022] Figure 5 This is a schematic diagram of adding transient excitation to the finite element simulation model provided in the embodiments of this application.

[0023] Figure 6 This is a current distribution characteristic diagram in the assumed target electrical performance provided in the embodiments of this application. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0025] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. In this application, the symbol " / " indicates that the related objects are in an "or" relationship, for example, A / B means A or B.

[0026] In this application, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order of objects. For example, "first response message" and "second response message," etc., are used to distinguish different response messages, not to describe a specific order of response messages.

[0027] In this application, the term "electrical connection" can refer to a direct circuit connection or a signal transmission via a communication protocol.

[0028] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0029] In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more, for example, multiple processing units means two or more processing units, multiple elements means two or more elements, etc.

[0030] The embodiments of this application are described below with reference to the accompanying drawings.

[0031] like Figure 1 As shown, this application provides a method for controlling the resistive electrical properties of carbon ceramics based on particle flow-finite element method, including: Obtain the target electrical performance parameter values, and index the dataset of carbon ceramic resistive electrical performance with respect to different particle distributions based on the target electrical performance parameter values ​​to obtain the particle distribution that satisfies the target electrical performance.

[0032] Preferably, the electrical performance parameters include at least one of the following: maximum withstand impulse voltage, number and length of local breakdown channels, current distribution characteristics, and maximum withstand power frequency voltage.

[0033] Preferably, the method for determining whether the target electrical performance is met is as follows: for parameters mentioned in the target electrical performance, the judgment is based on the fact that the corresponding parameters of the simulated electrical performance are not lower than the parameters mentioned in the target electrical performance; for parameters not mentioned in the target electrical performance, the judgment is based on the fact that the corresponding parameters of the simulated electrical performance are not lower than the corresponding parameters of the original carbon ceramic resistor electrical performance.

[0034] The dataset of the electrical resistance properties of the carbon ceramic with respect to different particle distributions was obtained in the following way: S1. Based on the carbon ceramic resistor particle flow coding model and finite element model, the actual particle arrangement of the carbon ceramic resistor is screened out, and the actual particle arrangement matrix is ​​constructed.

[0035] Preferably, the actual particle arrangement of the carbon ceramic resistor is screened based on the carbon ceramic resistor particle flow coding model and the finite element model, as follows: Initial screening of mechanical properties: Compare the simulated mechanical properties of the particle flow coding model with the measured mechanical properties, and screen out particle arrangement patterns that match the mechanical properties; Further screening of thermal performance: By comparing thermal performance, particle arrangement patterns that are consistent with the microstructure of the particle flow coding model and the finite element model were selected. Final selection of electrical performance: Compare the simulated electrical performance of the finite element model with the measured electrical performance, and select the particle arrangement that matches the electrical performance as the true particle arrangement of the carbon ceramic resistor.

[0036] Preferably, the construction of the real particle arrangement matrix is ​​specifically as follows: different types of particles are represented by digital codes, and the particle arrangement image is converted into a matrix representation.

[0037] In one illustrated embodiment, a carbon ceramic resistor was subjected to physicochemical analyses including X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) to obtain the elemental composition, ceramic phase characteristics, lattice size, and particle morphology. The analysis results showed that the carbon ceramic resistor was mainly composed of carbon particles, ceramic particles, and pores, with relative contents of 11%, 65%, and 24%, respectively. Based on the scale of the surface morphology images, the average size of the carbon particles was measured to be 50 nm, the average size of the ceramic particles was 5 μm, and the average size of the pores was 1 μm.

[0038] In one illustrated embodiment, the carbon ceramic resistor was subjected to mechanical property tests including compression, tensile, and three-point bending tests to obtain its compressive strength, tensile strength, and fracture toughness. The test results showed that the compressive strength and tensile strength of the carbon ceramic resistor were 108 MPa and 23 MPa, respectively. Its fracture toughness can be summarized as follows: with increasing external force, the carbon ceramic resistor initially exhibits elastic deformation, then enters a plastic stage, and finally undergoes brittle fracture after crack propagation. The fracture toughness was calculated to be 1.8 MPa·m based on the stress intensity factor during crack propagation. 1 / 2The maximum withstand impulse voltage is 20kV; the number of local breakdown channels is 2, corresponding to channel lengths of 6.300mm and 7.800mm; the internal current distribution characteristics of the carbon ceramic resistor in the experiment were obtained by inverting the thermal distribution characteristics, such as... Figure 2 As shown, its maximum withstand voltage at power frequency is 15kV.

[0039] In one illustrated embodiment, XPS, XRD, and SEM analysis results and mechanical property test results are input into the particle flow coding model. Multiple particle arrangement methods are generated using a random filling method, and the interaction force model between particles, friction coefficient, elastic modulus, etc. are set to establish the particle flow coding model of carbon ceramic resistor. The particle composition, relative particle content, and radius size are set in the particle flow coding software.

[0040] In one illustrated embodiment, the mechanical properties are simulated using a particle flow coding model. The particle arrangement that meets the error requirement is selected based on the criterion that the relative error between the simulated mechanical properties and the measured mechanical properties is less than a preset threshold (e.g., 10%).

[0041] In one illustrated embodiment, a Voronoi diagram is used to convert the arrangement of the screened particles into an irregular polygonal structure, and a finite element model of the carbon ceramic resistor is established.

[0042] In one illustrated embodiment, the thermal performance of the carbon ceramic resistor is simulated using both a particle flow coding model and a finite element model. The relative error between the thermal performance outputs of the two models is less than a preset threshold (e.g., 10%), and particle arrangement patterns that meet the error requirements are further selected. This selection process ensures consistency in the microstructure of the carbon ceramic resistor as represented by the two models.

[0043] In one illustrated embodiment, the electrical performance of the carbon ceramic resistors corresponding to the further screened particle arrangement patterns is simulated using a finite element model. The criterion is that the relative error between the simulated and measured electrical performance is less than a preset threshold (e.g., 10%). Finally, the true particle arrangement patterns representing the carbon ceramic resistors are selected. Figure 3 As shown.

[0044] In one illustrated embodiment, after obtaining the actual particle arrangement, different types of particles are represented by digital codes, and the particle arrangement image is converted into a matrix representation.

[0045] S2. Extract the interface characteristic matrix containing interface interaction information from the particle flow coding model and finite element model, and fine-tune the particle distribution in the real particle arrangement matrix.

[0046] Preferably, the interface characteristic matrix includes four basic constants: interface resistance, interface thermal expansion coefficient, interface bonding strength, and actual contact area.

[0047] Preferably, the fine-tuning of the particle distribution in the real particle arrangement matrix is ​​specifically as follows: the fine-tuning objects in the particle arrangement matrix are randomly adjusted, and the fine-tuning objects include the carbon particle distribution, ceramic particle distribution, and pore distribution.

[0048] Preferably, the fine-tuning method is to change the arrangement order of particles in the same row or the arrangement order of particles in the same column.

[0049] In one illustrated embodiment, after screening the actual particle arrangement, it is necessary to extract the interface characteristic matrix containing interface interaction information from the particle flow coding model and the finite element model. The interface characteristic matrix includes interface resistance, interface thermal expansion coefficient, interface bonding strength, and actual contact area. Interface resistance characterizes the resistance to current conduction between carbon and ceramic particles; the interface thermal expansion coefficient characterizes the degree of expansion of the particle interface due to temperature changes; interface bonding strength characterizes the bonding strength between carbon and ceramic particles; and the actual contact area characterizes the surface area of ​​actual contact between carbon and ceramic particles. This matrix should remain unchanged when subsequently fine-tuning the particle arrangement matrix.

[0050] In one illustrated embodiment, the interface resistance is approximately 0.09 Ω·cm. 3 The interfacial thermal expansion coefficient of carbon particulate materials is approximately 0.8 × 10⁻⁶. -6 At / ℃, the coefficient of thermal expansion of the ceramic particle material interface is approximately 6×10⁻⁶. -6 / ℃; interfacial bonding strength is approximately 23MPa; actual contact area is approximately 50% of the theoretical contact area.

[0051] In one illustrated embodiment, fine-tuning is performed on the particle distribution within the particle arrangement matrix. The fine-tuning targets three categories: carbon particle distribution G1, ceramic particle distribution G2, and pore distribution G3. Fine-tuning is performed randomly on G1, G2, and G3 within the particle arrangement matrix, such as... Figure 4 As shown, the order of particles in the same row or column can be changed.

[0052] S3. Using the particle flow coding model corresponding to the fine-tuned particle arrangement matrix and the interface characteristic matrix corresponding to the actual particle arrangement, simulate the force and / or thermal properties of the carbon ceramic resistor corresponding to the fine-tuned particle arrangement matrix.

[0053] Preferably, the finite element model of the carbon ceramic resistor simulates its electrical performance as follows: The particle arrangement matrix was transformed into an irregular polygonal structure using Voronoi diagrams to simulate the heterogeneous characteristics of carbon ceramic resistor microstructures, and its electrical performance was simulated using a finite element model. Import the irregular polygonal structure into the finite element model, select transient electric field and current field as the physical field interface, and set the material properties of carbon particles, ceramic particles and pores. like Figure 5 As shown, one side of the carbon ceramic resistor is selected as the terminal and the other side is selected as the ground terminal, and transient current excitation or transient voltage excitation under actual operating conditions is applied at the terminal. The electrical properties of carbon ceramic resistors are solved by mesh generation, and the electrical performance parameters are extracted.

[0054] In addition, local breakdown characteristics can be obtained through transient electric field simulation. If the electric field strength at a particle or pore exceeds its critical breakdown electric field strength, then local breakdown is determined to have occurred in that space.

[0055] Based on the finite element model and the physical field addition method, the electrical performance of the carbon ceramic resistor corresponding to the fine-tuned particle arrangement matrix is ​​simulated to obtain its impulse voltage withstand capability, power frequency voltage withstand capability, local breakdown characteristics, and current distribution characteristics.

[0056] S4. If the simulation results of the resistivity and / or thermal properties of the carbon ceramic before and after fine-tuning are consistent, use the finite element model to simulate the electrical properties of the carbon ceramic resistor corresponding to the particle arrangement matrix after fine-tuning. Otherwise, readjust the actual particle arrangement matrix and proceed to S3.

[0057] In one illustrated embodiment, the finely tuned particle arrangement matrix and interface characteristic matrix are input into the particle flow coding model, and the mechanical-thermal performance of the carbon ceramic resistor corresponding to the particle arrangement matrix is ​​simulated. If the mechanical-thermal performance simulation result A... s Comparison with the mechanical-thermal performance simulation results before fine-tuning (A) e If the relative error is less than the preset threshold (e.g., 20%), it is considered that the fine-tuned particle arrangement matrix still belongs to the category of carbon ceramic resistor microstructure; if the set error requirement is not met, G1, G2, and G3 need to be fine-tuned again, and then mechanical-thermal performance simulation and comparative analysis should be performed until the set error requirement is met.

[0058] S5. Repeat S3-S4 until a preset number of effective particle arrangement matrices are obtained.

[0059] In one illustrated embodiment, a matrix of 100 effective particle arrangement methods is obtained.

[0060] S6. Simulate the electrical performance of the carbon ceramic resistor corresponding to each effective particle arrangement matrix, extract the electrical performance corresponding to different particle distributions, and construct a dataset of the electrical performance of carbon ceramic resistors with respect to different particle distributions.

[0061] In one illustrated embodiment, the electrical performance of carbon ceramic resistors corresponding to these 100 particle arrangement matrices is simulated. The electrical performance corresponding to different particle distributions is extracted, and a dataset of carbon ceramic resistor electrical performance with respect to different particle distributions is finally constructed. Assuming the target electrical performance is a maximum withstand voltage of 25kV under transient high-energy injection, a single local breakdown channel with a length of less than 5.000mm, and current distribution characteristics as follows... Figure 6 As shown, the maximum withstand voltage at power frequency is 18kV. Therefore, based on the target electrical performance parameters, the particle distribution that meets the target electrical performance is found by indexing the dataset. Then, by controlling the sintering process, the carbon ceramic resistance corresponding to the particle distribution is reproduced, thus completing the regulation of the electrical performance.

[0062] It is understood that the detailed functional implementation of each of the above units / modules can be found in the description in the aforementioned method embodiments, and will not be repeated here.

[0063] It should be understood that the above-described device is used to execute the methods in the above embodiments. The implementation principle and technical effect of the corresponding program modules in the device are similar to those described in the above methods. The working process of the device can be referred to the corresponding process in the above methods, and will not be repeated here.

[0064] Based on the methods in the above embodiments, this application provides an electronic device that may include a processor, a communications interface, a memory, and a communication bus, wherein the processor, communications interface, and memory communicate with each other via the communication bus. The processor may invoke logical instructions stored in the memory to execute the methods in the above embodiments.

[0065] Furthermore, the logical instructions in the aforementioned memory can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.

[0066] Based on the methods in the above embodiments, this application provides a computer-readable storage medium storing a computer program that, when run on a processor, causes the processor to execute the methods in the above embodiments.

[0067] Based on the methods in the above embodiments, this application provides a computer program product that, when run on a processor, causes the processor to execute the methods in the above embodiments.

[0068] It is understood that the processor in the embodiments of this application can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. A general-purpose processor can be a microprocessor or any conventional processor.

[0069] The method steps in this application embodiment can be implemented in hardware or by a processor executing software instructions. The software instructions can consist of corresponding software modules, which can be stored in random access memory (RAM), flash memory, read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), registers, hard disks, portable hard disks, CD-ROMs, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor, enabling the processor to read information from and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and the storage medium can reside in an ASIC.

[0070] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially as a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium. The computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk (SSD)).

[0071] It is understood that the various numerical designations used in the embodiments of this application are merely for the convenience of description and are not intended to limit the scope of the embodiments of this application.

[0072] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method for controlling the resistive electrical properties of carbon ceramics based on particle flow-finite element method, characterized in that, include: Obtain the target electrical performance parameter values, and index the dataset of carbon ceramic resistive electrical performance with respect to different particle distributions based on the target electrical performance parameter values ​​to obtain the particle distribution that satisfies the target electrical performance; wherein, the dataset of carbon ceramic resistive electrical performance with respect to different particle distributions is obtained in the following way: S1. Based on the carbon ceramic resistor particle flow coding model and finite element model, the actual particle arrangement of carbon ceramic resistors is screened out, and the actual particle arrangement matrix is ​​constructed. S2. Extract the interface characteristic matrix containing interface interaction information from the particle flow coding model and the finite element model, and fine-tune the particle distribution in the real particle arrangement matrix. S3. Using the particle flow coding model corresponding to the fine-tuned particle arrangement matrix and the interface characteristic matrix corresponding to the real particle arrangement, the force and / or thermal properties of the carbon ceramic resistor corresponding to the fine-tuned particle arrangement matrix are simulated. S4. If the simulation results of the resistivity and / or thermal properties of carbon ceramic before and after fine-tuning are consistent, use the finite element model to simulate the electrical properties of the carbon ceramic resistor corresponding to the particle arrangement matrix after fine-tuning; otherwise, readjust the actual particle arrangement matrix and proceed to S3. S5. Repeat S3-S4 until a preset number of effective particle arrangement matrices are obtained; S6. Simulate the electrical performance of the carbon ceramic resistor corresponding to each effective particle arrangement matrix, extract the electrical performance corresponding to different particle distributions, and construct a dataset of the electrical performance of carbon ceramic resistors with respect to different particle distributions.

2. The electrical performance regulation method as described in claim 1, characterized in that, The electrical performance parameters include at least one of the following: maximum withstand impulse voltage, number and length of local breakdown channels, current distribution characteristics, and maximum withstand power frequency voltage.

3. The electrical performance regulation method as described in claim 1, characterized in that, The method for determining whether the target electrical performance is met is as follows: For the parameters mentioned in the target electrical performance, the criterion is that the corresponding parameters of the simulated electrical performance are not lower than the parameters mentioned in the target electrical performance. For parameters not mentioned in the target electrical performance, the criterion is that the corresponding parameters of the simulated electrical performance are not lower than the corresponding parameters of the original carbon ceramic resistive electrical performance.

4. The electrical performance regulation method as described in claim 1, characterized in that, The construction of the real particle arrangement matrix is ​​as follows: different types of particles are represented by digital codes, and the particle arrangement image is converted into a matrix representation.

5. The electrical performance regulation method as described in claim 1, characterized in that, The fine-tuning of the particle distribution in the real particle arrangement matrix is ​​as follows: the fine-tuning objects in the particle arrangement matrix are randomly adjusted, and the fine-tuning objects include the carbon particle distribution, ceramic particle distribution and pore distribution.

6. The electrical performance regulation method as described in claim 5, characterized in that, The fine-tuning method is to change the arrangement order of particles in the same row or the arrangement order of particles in the same column.

7. The electrical performance regulation method as described in claim 1, characterized in that, Based on the carbon ceramic resistor particle flow coding model and finite element model, the actual particle arrangement of the carbon ceramic resistor is screened out as follows: Initial screening of mechanical properties: Compare the simulated mechanical properties of the particle flow coding model with the measured mechanical properties, and screen out particle arrangement patterns that match the mechanical properties; Further screening of thermal performance: By comparing thermal performance, particle arrangement patterns that are consistent with the microstructure of the particle flow coding model and the finite element model were selected. Final selection of electrical performance: Compare the simulated electrical performance of the finite element model with the measured electrical performance, and select the particle arrangement that matches the electrical performance as the true particle arrangement of the carbon ceramic resistor.

8. The electrical performance regulation method as described in claim 1, characterized in that, The interface characteristic matrix includes four basic constants: interface resistance, interface thermal expansion coefficient, interface bonding strength, and actual contact area.

9. The electrical performance regulation method as described in claim 1, characterized in that, The electrical performance of the carbon ceramic resistor is simulated using the finite element model as follows: The particle arrangement matrix is ​​converted into an irregular polygonal structure using a Voronoi diagram; Import the irregular polygonal structure into the finite element model, select transient electric field and current field as the physical field interface, and set the material properties of carbon particles, ceramic particles and pores. One side of the carbon ceramic resistor is set as the terminal, and the other side is set as the ground terminal. Transient current excitation or transient voltage excitation under actual operating conditions is applied to the terminal. The electrical properties of carbon ceramic resistors are solved by mesh generation, and the electrical performance parameters are extracted.

10. A carbon ceramic resistivity control system based on particle flow-finite element method, characterized in that, include: At least one memory for storing programs; At least one processor is configured to access a program stored in the memory, wherein when the program stored in the memory is accessed, the processor is configured to access the electrical performance control method as described in any one of claims 1 to 9.

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