Method and device for calculating equivalent electromagnetic parameters of hollow fabric composite material

Abstract

The invention provides a hollow fabric composite material equivalent electromagnetic parameter calculation method and device, and the method comprises the steps: carrying out the three-dimensional modeling of a hollow fabric, and obtaining a fiber fabric unit cell structure model; wherein the hollow fabric is obtained by integral weaving and sequentially comprises an upper surface layer, a core layer with a cavity and a lower surface layer; based on the fiber fabric unit cell structure model, performing three-dimensional modeling on a hollow fabric composite material obtained by compounding a hollow fabric and a base material to obtain a composite material unit cell structure model; performing simulation calculation on the composite material unit cell structure model to obtain a first scattering parameter of the hollow fabric composite material; establishing an equivalent homogenization medium model of the hollow fabric composite material; and performing simulation calculation on the equivalent homogenization medium model according to the first scattering parameter to obtain an equivalent electromagnetic parameter of the hollow fabric composite material. According to the scheme, the equivalent electromagnetic parameters of the hollow fabric composite materials of different structures can be rapidly obtained, and the calculation precision and accuracy of the electromagnetic parameters are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetics, in particular to the technical field of electromagnetic parameter calculation, and particularly to a method and device for calculating the equivalent electromagnetic parameters of a hollow fabric composite material. Background Art

[0002] The hollow fabric composite material is a new type of integrated structural and functional composite material. Due to its advantages such as light weight, high strength, designable performance, and integral manufacturability, it also has characteristics such as heat insulation, high temperature resistance, low temperature resistance, corrosion resistance, wave transmission, and wave absorption, and can adapt to special environmental requirements, and has a wide range of applications in the field of electronic information. Among them, the hollow fabric composite material is obtained by compounding a hollow fabric and a matrix material. The hollow fabric is integrally woven by a special process, and its upper and lower layers and pile warps are respectively formed by the warp yarns (ground warp yarns and pile warp yarns) and weft yarns being interwoven in sequence. The pile warps penetrate the upper and lower layers and the middle core layer to form a multi-layer structure with a certain cavity height.

[0003] For the traditional honeycomb sandwich structure, the electromagnetic parameters of each layer of structural materials can be obtained. As an integral continuous multi-layer heterogeneous structural material, it is difficult to obtain the electromagnetic parameters of each layer of structural materials for the hollow fabric composite material, and only the electromagnetic parameters can be obtained through the overall structure test. However, due to limited test conditions and test cycle limitations, it is difficult to effectively and quickly obtain the electromagnetic parameters of hollow fabric composite materials with different structures. At the same time, the pile warps in the middle core layer of the hollow fabric composite material all show the characteristics of three-dimensional spatial cross arrangement, and it is difficult to directly use the traditional classical effective medium theory to calculate the equivalent electromagnetic parameters of the composite material. At present, there is no clear method to quickly obtain the electromagnetic parameters of hollow fabric composite materials with different structures without conducting the overall structure test. Summary of the Invention

[0004] To solve the above problems, the embodiments of the present invention provide a method and device for calculating the equivalent electromagnetic parameters of a hollow fabric composite material. This method realizes the calculation of the equivalent electromagnetic parameters of the hollow fabric composite material through the microscopic structure model of the hollow fabric composite material, and can not only quickly obtain the equivalent electromagnetic parameters of hollow fabric composite materials with different structures, but also effectively improve the calculation accuracy of the electromagnetic parameters.

[0005] In a first aspect, the embodiments of the present invention provide a method for calculating the equivalent electromagnetic parameters of a hollow fabric composite material, including:

[0006] Perform three-dimensional modeling on the hollow fabric to obtain a fiber fabric unit cell structure model; wherein, the hollow fabric is integrally woven and sequentially includes an upper layer, a core layer with a cavity, and a lower layer;

[0007] Based on the fiber fabric unit cell structure model, a three-dimensional modeling is performed on the hollow fabric composite material obtained by combining the hollow fabric and the matrix material to obtain a composite material unit cell structure model;

[0008] Perform simulation calculations on the composite material unit cell structure model to obtain the first scattering parameter of the hollow fabric composite material;

[0009] Establish an equivalent homogenized medium model for the hollow fabric composite material;

[0010] Perform simulation calculations on the equivalent homogenized medium model according to the first scattering parameter to obtain the equivalent electromagnetic parameters of the hollow fabric composite material.

[0011] Optionally, the upper layer, the lower layer and the pile warp are sequentially interwoven by warp yarns and weft yarns, and the pile warp penetrates through the upper layer and the lower layer to form the core layer with a cavity;

[0012] The three-dimensional modeling of the hollow fabric to obtain the fiber fabric unit cell structure model includes:

[0013] Determine the structural characteristic parameters of the hollow fabric, where the structural characteristic parameters include the linear density of the fiber yarns used, the single fiber diameter of the fiber yarns, the radial density of the warp yarns, the weft density of the weft yarns, the number of interweaving points and the intersection positions of the pile warp passing through the upper layer, and the number of interweaving points and the intersection positions of the pile warp passing through the lower layer;

[0014] Perform three-dimensional modeling according to the structural characteristic parameters to obtain the fiber fabric unit cell structure model.

[0015] Optionally, the three-dimensional modeling of the hollow fabric composite material based on the fiber fabric unit cell structure model to obtain the composite material unit cell structure model includes:

[0016] Determine the type of the matrix material and the fiber content in the hollow fabric composite material;

[0017] Perform three-dimensional modeling on the basis of the fiber fabric unit cell structure model according to the type of the matrix material and the fiber content to obtain the composite material unit cell structure model.

[0018] Optionally, the fiber used in the hollow fabric is at least one of glass fiber, quartz fiber, low-dielectric fiber, polyimide fiber, aramid fiber, carbon fiber, and metal fiber.

[0019] Optionally, the matrix material is a resin matrix, a carbide ceramic matrix, an oxide ceramic matrix, or a nitride ceramic matrix.

[0020] Optionally, performing simulation calculations on the composite material unit cell structure model to obtain the first scattering parameters of the hollow fabric composite material, including:

[0021] Setting the periodic boundary conditions and Floquet port excitation of the hollow fabric composite material by using the rectangular waveguide method;

[0022] Obtaining the three-dimensional model of the hollow fabric composite material according to the periodic boundary conditions, the Floquet port excitation, and the composite material unit cell structure model;

[0023] Performing simulation calculations on the three-dimensional model according to the electromagnetic parameters of the fibers used in the hollow fabric and the electromagnetic parameters of the matrix material to obtain the first scattering parameters; wherein, the electromagnetic parameters include dielectric constant, loss tangent value, and magnetic permeability.

[0024] Optionally, establishing the equivalent homogenized medium model of the hollow fabric composite material, including:

[0025] Performing multi-layer homogenized equivalent modeling on the hollow fabric composite material to obtain an equivalent multi-layer homogenized medium model including an upper layer equivalent model, a core layer equivalent model, and a lower layer equivalent model.

[0026] Optionally, establishing the equivalent homogenized medium model of the hollow fabric composite material, including:

[0027] Performing single-layer homogenized equivalent modeling on the hollow fabric composite material to obtain an equivalent single-layer homogenized medium model.

[0028] Optionally, performing simulation calculations on the equivalent homogenized medium model according to the first scattering parameters to obtain the equivalent electromagnetic parameters of the hollow fabric composite material, including:

[0029] S1: Determining the electromagnetic parameter range, the preset proximity threshold, and the initial electromagnetic parameters according to the hollow fabric composite material; wherein, the electromagnetic parameter range includes the dielectric constant range and the loss tangent value range;

[0030] S2: Using the initial electromagnetic parameters as the current electromagnetic parameters for the current iteration;

[0031] S3: Performing simulation calculations on the equivalent homogenized medium model by using the HFSS algorithm under the current electromagnetic parameters to obtain the second scattering parameters;

[0032] S4: Calculating the similarity between the first scattering parameters and the second scattering parameters, and determining the similarity as the fitness;

[0033] S5: Determine whether the fitness is not less than the preset proximity threshold. If so, execute step S6; otherwise, execute step S7.

[0034] S6: Determine the current electromagnetic parameters of the current iteration as the equivalent electromagnetic parameters.

[0035] S7: Based on the electromagnetic parameter range, perform crossover and mutation on the current electromagnetic parameters of the current iteration to obtain optimized electromagnetic parameters. Determine the optimized electromagnetic parameters as the current electromagnetic parameters of the next iteration, and return to step S3.

[0036] Optionally, the performing simulation calculation on the composite material unit cell structure model to obtain the first scattering parameter of the hollow fabric composite material further includes:

[0037] Obtain the true scattering parameter of the hollow fabric composite material with a thickness not greater than 3 mm obtained by testing.

[0038] Optimize the simulation calculation according to the true scattering parameter until the first scattering parameter is the same as the true scattering parameter.

[0039] In a second aspect, an embodiment of the present invention further provides a calculation device for the equivalent electromagnetic parameters of a hollow fabric composite material, including:

[0040] A first construction module for performing three-dimensional modeling on a hollow fabric to obtain a fiber fabric unit cell structure model; wherein, the hollow fabric is integrally woven and sequentially includes an upper layer, a core layer with a cavity, and a lower layer.

[0041] A second construction module for performing three-dimensional modeling on a hollow fabric composite material obtained by combining the hollow fabric and a matrix material based on the fiber fabric unit cell structure model to obtain a composite material unit cell structure model.

[0042] A first simulation module for performing simulation calculation on the composite material unit cell structure model to obtain the first scattering parameter of the hollow fabric composite material.

[0043] An equivalent module for establishing an equivalent homogenized medium model of the hollow fabric composite material.

[0044] A second simulation module for performing simulation calculation on the equivalent homogenized medium model according to the first scattering parameter to obtain the equivalent electromagnetic parameters of the hollow fabric composite material.

[0045] In a third aspect, an embodiment of the present invention further provides a computing device, including a memory and a processor. A computer program is stored in the memory. When the processor executes the computer program, the computing method for the equivalent electromagnetic parameters of the hollow fabric composite material described in any one of the above is implemented.

[0046] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed on a computer, the computer is made to execute the computing method for the equivalent electromagnetic parameters of the hollow fabric composite material described in any one of the above.

[0047] In a fifth aspect, an embodiment of the present invention further provides a computer program product, including computer instructions. When the computer instructions are executed by a processor, the steps of the method described in any first aspect of this specification are implemented.

[0048] Compared with the prior art, the present invention has at least the following beneficial effects:

[0049] (1) The present invention provides a computing method and device for the equivalent electromagnetic parameters of a hollow fabric composite material. The method obtains a fiber fabric unit cell structure model by three-dimensional modeling of the hollow fabric. Then, based on this model, combined with the structural characteristics after the composite molding of the hollow fabric and the matrix material, a composite material unit cell structure model of the hollow fabric composite material is established. Then, the composite material unit cell structure model is simulated and calculated to obtain the first scattering parameter. Then, an equivalent homogenized medium model of the hollow fabric composite material is established, and the equivalent homogenized medium model is simulated and calculated based on the first scattering parameter, and finally the equivalent electromagnetic parameters are obtained. In this way, after precise three-dimensional modeling, the present invention uses two simulation calculation methods to improve the calculation accuracy and accuracy of the equivalent electromagnetic parameters. At the same time, there is no need to obtain electromagnetic parameters through sample preparation testing, and the equivalent electromagnetic parameters of hollow fabric composite materials with different structures can be quickly obtained.

[0050] (2) The present invention calculates the equivalent electromagnetic parameters based on the microscopic structure model of the hollow fabric, fully considering the influence of material structure parameters such as fiber type, fiber parameters, the tissue structure of the hollow fabric, the type of matrix material, and fiber content on the electromagnetic parameters, making the fiber fabric unit cell structure model and the composite material unit cell structure model closest to the structures of the real hollow fabric and the hollow fabric composite material, thereby effectively improving the calculation accuracy of the electromagnetic parameters.

[0051] (3) In the present invention, the electromagnetic parameters of hollow fabric composite materials with different tissue structures can be quickly obtained through the calculation method of equivalent electromagnetic parameters, and there is no need to obtain electromagnetic parameters through sample preparation anymore; secondly, through the electrical performance simulation calculation of the equivalent homogenization model, the simulation calculation amount can be effectively reduced, the material design and development cycle and cost can be shortened, and the design efficiency can be improved. Brief Description of the Drawings

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0053] Figure 1 It is a flowchart of a method for calculating the equivalent electromagnetic parameters of a hollow fabric composite material provided by an embodiment of the present invention;

[0054] Figure 2 It is a schematic structural diagram of a hollow fabric provided by an embodiment of the present invention;

[0055] Figure 3 It is a schematic structural diagram of a composite unit cell structure model provided by an embodiment of the present invention;

[0056] Figure 4 It is a schematic structural diagram of an equivalent multi-layer homogenized dielectric unit cell model provided by an embodiment of the present invention;

[0057] Figure 5 It is a schematic structural diagram of an equivalent single-layer homogenized dielectric unit cell model provided by an embodiment of the present invention;

[0058] Figure 6 It is a comparative curve diagram of the true reflection coefficient and the equivalent reflection coefficient at different frequency bands provided by an embodiment of the present invention;

[0059] Figure 7 It is a comparative curve diagram of the true transmission coefficient and the equivalent transmission coefficient at different frequency bands provided by an embodiment of the present invention;

[0060] Figure 8 It is a hardware architecture diagram of a computing device provided by an embodiment of the present invention;

[0061] Figure 9 It is a structural diagram of a device for calculating the equivalent electromagnetic parameters of a hollow fabric composite material provided by an embodiment of the present invention;

[0062] Reference Signs: 201 - upper layer; 202 - core layer; 203 - lower layer; 301 - upper layer of the hollow fabric composite material; 302 - core layer of the hollow fabric composite material; 303 - lower layer of the hollow fabric composite material; 401 - upper layer unit cell equivalent model; 402 - core layer unit cell equivalent model; 403 - lower layer unit cell equivalent model. Detailed Description of the Embodiments

[0063] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0064] The following is the concept of the present invention. As Figure 1 shown, the embodiments of the present invention provide a method for calculating the equivalent electromagnetic parameters of a hollow fabric composite material, and the method includes:

[0065] Step 100: Perform three-dimensional modeling on the hollow fabric to obtain a fiber fabric unit cell structure model. Among them, the hollow fabric is integrally woven and sequentially includes an upper layer, a core layer with a cavity, and a lower layer.

[0066] Step 102: Based on the fiber fabric unit cell structure model, perform three-dimensional modeling on the hollow fabric composite material obtained by combining the hollow fabric and the matrix material to obtain a composite material unit cell structure model.

[0067] Step 104: Perform simulation calculations on the composite material unit cell structure model to obtain the first scattering parameter of the hollow fabric composite material.

[0068] Step 106: Establish an equivalent homogenized medium model for the hollow fabric composite material.

[0069] Step 108: Perform simulation calculations on the equivalent homogenized medium model according to the first scattering parameter to obtain the equivalent electromagnetic parameters of the hollow fabric composite material.

[0070] In the embodiments of the present invention, first, a fiber fabric unit cell structure model is obtained by performing three-dimensional modeling on the hollow fabric. Then, based on this model, combined with the structural characteristics after the composite molding of the hollow fabric and the matrix material, a composite material unit cell structure model of the hollow fabric composite material is established. Then, simulation calculations are performed on the composite material unit cell structure model to obtain the first scattering parameter. After that, an equivalent homogenized medium model of the hollow fabric composite material is established, and simulation calculations are performed on the equivalent homogenized medium model based on the first scattering parameter to finally obtain the equivalent electromagnetic parameters. In this way, after precise three-dimensional modeling, the present invention uses two simulation calculation methods to improve the calculation accuracy and accuracy of the equivalent electromagnetic parameters. At the same time, there is no need to obtain electromagnetic parameters through sample testing, and the equivalent electromagnetic parameters of hollow fabric composite materials with different structures can be quickly obtained.

[0071] The following describes Figure 1 the execution manners of the following steps.

[0072] In step 100, the upper layer, the lower layer, and the pile warp are all obtained by the sequential interweaving of warp yarns and weft yarns, and the pile warp penetrates through the upper layer and the lower layer to form a core layer with a cavity;

[0073] Perform three-dimensional modeling on the hollow fabric to obtain a fiber fabric unit cell structure model, including:

[0074] Determine the structural characteristic parameters of the hollow fabric, where the structural characteristic parameters include the linear density of the fiber yarns used, the single-filament fiber diameter of the fiber yarns, the radial density of the warp yarns, the weft density of the weft yarns, the number of interlacing points and the positions of the intersection points of the pile warp passing through the upper layer, and the number of interlacing points and the positions of the intersection points of the pile warp passing through the lower layer;

[0075] Perform three-dimensional modeling according to the structural characteristic parameters to obtain a fiber fabric unit cell structure model.

[0076] In the embodiment of the present invention, when performing three-dimensional modeling on the hollow fabric, the influence of structural characteristic parameters such as fiber type, fiber parameters (including the linear density of the fiber yarns, the single-filament fiber diameter of the fiber yarns), and the tissue structure of the hollow fabric (including the radial density of the warp yarns, the weft density of the weft yarns, the number of interlacing points and the positions of the intersection points of the pile warp passing through the upper layer, and the number of interlacing points and the positions of the intersection points of the pile warp passing through the lower layer) on the electromagnetic parameters is fully considered, so that the fiber fabric unit cell structure model is closest to the real hollow fabric, thereby effectively improving the calculation accuracy of the electromagnetic parameters.

[0077] It should be noted that the hollow fabric is an integrally woven and formed integral layer-connected hollow fabric; the structure of the core layer includes an 8-shaped, W-shaped, V-shaped, π-shaped, O-shaped, II-shaped, or X-shaped. As Figure 2 shown, the hollow fabric is composed of an upper layer, an 8-shaped core layer, and a lower layer, Figure 2 which shows a schematic structural diagram of the hollow fabric with one core layer. In addition, the number of core layers of the hollow fabric can also be 2, 3, 4, 5, or 6, etc. For example, if the hollow fabric has two core layers, its structure can specifically be the first surface layer - the first core layer - the second surface layer - the second core layer - the third surface layer. At this time, the second surface layer is both the lower layer of the first core layer and the upper layer of the second core layer; it can also be the stacking of two-layer hollow fabrics, that is, the first surface layer - the first core layer - the second surface layer - the third surface layer - the second core layer - the fourth surface layer. It should be noted that the thicknesses of different core layers can be the same or different, and can also be designed as a gradient design, which can be specifically designed according to application requirements.

[0078] In a preferred embodiment, the fiber used for the hollow fabric is at least one of glass fiber, quartz fiber, low-dielectric fiber, polyimide fiber, aramid fiber, carbon fiber, and metal fiber.

[0079] It should be noted that at least one means any one or any combination of several mixtures in any proportion. Specifically, when the fibers used in the hollow fabric are multiple, the structural characteristic parameters also include the fiber composition of the warp and the fiber composition of the weft.

[0080] In step 102, based on the fiber fabric unit cell structure model, three-dimensional modeling is performed on the hollow fabric composite material obtained by compounding the hollow fabric and the matrix material to obtain a composite material unit cell structure model, including:

[0081] Determine the type of the matrix material and the fiber content in the hollow fabric composite material;

[0082] Based on the type of the matrix material and the fiber content, three-dimensional modeling is performed on the basis of the fiber fabric unit cell structure model to obtain a composite material unit cell structure model.

[0083] Specifically, the matrix material is coated on the upper layer, the core layer, and the lower layer of the hollow fabric, and the hollow fabric composite material is obtained through compounding; among them, the composite material unit cell structure model is as Figure 3 shown.

[0084] In the embodiment of the present invention, when performing three-dimensional modeling on the hollow fabric composite material, on the basis of the fiber fabric unit cell structure model, the influence of material structure parameters such as the type of the matrix material and the fiber content on the electromagnetic parameters is fully considered, so that the composite material unit cell structure model is closest to the structure of the actual hollow fabric composite material, thereby effectively improving the calculation accuracy of the electromagnetic parameters.

[0085] In a preferred embodiment, the matrix material is a resin matrix, a carbide ceramic matrix, an oxide ceramic matrix, or a nitride ceramic matrix.

[0086] Specifically, the resin matrix includes but is not limited to epoxy resin, cyanate resin, polyimide resin, alkyne resin, etc.; the carbide ceramic matrix includes but is not limited to silicon carbide ceramic matrix, carbide ceramic matrix mainly composed of silicon carbide, etc.; the oxide ceramic matrix includes but is not limited to silicon oxide ceramic matrix, aluminum oxide ceramic matrix, zirconium oxide ceramic matrix, zinc oxide ceramic matrix, manganese oxide ceramic matrix, etc.; the nitride ceramic matrix includes but is not limited to silicon nitride ceramic matrix, aluminum nitride ceramic matrix, boron nitride matrix ceramic, etc.

[0087] In step 104, simulation calculation is performed on the composite material unit cell structure model to obtain the first scattering parameters of the hollow fabric composite material, including:

[0088] Set the periodic boundary conditions and Floquet port excitation of the hollow fabric composite material by using the rectangular waveguide method;

[0089] According to the periodic boundary conditions, Floquet port excitation, and the composite unit cell structure model, a three-dimensional model of the hollow fabric composite material is obtained;

[0090] Based on the electromagnetic parameters of the fibers used in the hollow fabric and the electromagnetic parameters of the matrix material, the three-dimensional model is simulated and calculated to obtain the first scattering parameters; among them, the electromagnetic parameters include the dielectric constant, loss tangent value, and magnetic permeability.

[0091] Specifically, the composite unit cell structure model is imported into the electromagnetic full-wave simulation software. Using the rectangular waveguide method, the periodic boundary conditions and Floquet port excitation of the hollow fabric composite material are set. Based on the periodic cycling of the composite unit cell structure model through the periodic boundary conditions and Floquet port excitation, a three-dimensional model is obtained; then, the electromagnetic parameters of the fibers used in the three-dimensional model and the electromagnetic parameters of the matrix material are assigned, and the scattering parameters of the two-port network, that is, the first scattering parameters (including reflection coefficient, transmission coefficient, etc.), are obtained by simulating and calculating the three-dimensional model.

[0092] In the embodiments of the present invention, by inputting the electromagnetic parameters of the fibers and matrix material used in the hollow fabric, the first scattering parameters of the hollow fabric composite material can be obtained by simulating and calculating using the composite unit cell structure model. The electromagnetic parameters of the fibers and matrix material can be directly obtained. Therefore, through this simulation calculation, the first scattering parameters of the hollow fabric composite material with any structure can be directly obtained, without obtaining the scattering parameters through sample preparation and testing, so that the scattering parameters can be obtained quickly.

[0093] In a more preferred embodiment, step 104 further includes:

[0094] Obtain the true scattering parameters of the hollow fabric composite material with a thickness not greater than 3 mm obtained by testing;

[0095] Optimize the simulation calculation according to the true scattering parameters until the first scattering parameters are the same as the true scattering parameters.

[0096] It should be noted that the true scattering parameters are obtained by sample preparation and testing. Due to limited testing conditions and restricted by the testing cycle, the hollow fabric composite material with a thickness ≤ 3 mm is selected for sample preparation and testing of its true scattering parameters.

[0097] In the embodiments of the present invention, in order to further ensure the accuracy of the simulation calculation results, the hollow fabric composite material with a thickness ≤ 3 mm is selected to optimize and verify the simulation calculation process. When the first scattering parameters are the same as the true scattering parameters, it is considered that the current simulation calculation process is the most reasonable and accurate, that is, the simulation calculation process is feasible and effective. Therefore, the first scattering parameters of the hollow fabric composite material with any thickness obtained based on this simulation calculation process are considered to be the true scattering parameters.

[0098] In step 106, an equivalent homogenized medium model of the hollow fabric composite material is established, including the following two methods:

[0099] The first method: Perform multi-layer homogenization equivalent modeling on the hollow fabric composite material to obtain an equivalent multi-layer homogenized medium model including an upper layer equivalent model, a core layer equivalent model, and a lower layer equivalent model;

[0100] Specifically, perform multi-layer homogenization equivalent modeling on the hollow fabric composite material to obtain an equivalent multi-layer homogenized medium unit cell model including an upper layer unit cell equivalent model, a core layer unit cell equivalent model, and a lower layer unit cell equivalent model as shown in Figure 4 Then, use the rectangular waveguide method in step 104 to set the periodic boundary conditions and Floquet port excitation of the hollow fabric composite material, and perform periodic cycling on the equivalent multi-layer homogenized medium unit cell model based on the set periodic boundary conditions and Floquet port excitation to obtain the equivalent multi-layer homogenized medium model of the hollow fabric composite material.

[0101] The second method: Perform single-layer homogenization equivalent modeling on the hollow fabric composite material to obtain an equivalent single-layer homogenized medium model;

[0102] Specifically, perform single-layer homogenization equivalent modeling on the hollow fabric composite material to obtain an equivalent single-layer homogenized medium unit cell model as shown in Figure 5 Then, use the rectangular waveguide method in step 104 to set the periodic boundary conditions and Floquet port excitation of the hollow fabric composite material, and perform periodic cycling on the equivalent single-layer homogenized medium unit cell model based on the set periodic boundary conditions and Floquet port excitation to obtain the equivalent single-layer homogenized medium model of the hollow fabric composite material.

[0103] It should be noted that the method for establishing the equivalent homogenized medium model in step 106 can be determined according to the specific application requirements of the hollow fabric composite material. Specifically, step 106 can directly use MATLAB to write a script to control the HFSS software, generate the equivalent homogenized medium model, and perform analysis and solution.

[0104] In step 108, perform simulation calculations on the equivalent homogenized medium model according to the first scattering parameter to obtain the equivalent electromagnetic parameters of the hollow fabric composite material, including:

[0105] S1: Determine the electromagnetic parameter range, preset proximity degree threshold, and initial electromagnetic parameters according to the hollow fabric composite material; among them, the electromagnetic parameter range includes the dielectric constant range and the loss tangent value range;

[0106] S2: Take the initial electromagnetic parameters as the current electromagnetic parameters for the current iteration.

[0107] S3: Under the current electromagnetic parameters, use the HFSS algorithm to perform simulation calculations on the equivalent homogenized medium model to obtain the second scattering parameters.

[0108] S4: Calculate the similarity between the first scattering parameters and the second scattering parameters, and determine the similarity as the fitness.

[0109] S5: Determine whether the fitness is not less than the preset proximity threshold. If so, execute step S6; otherwise, execute step S7.

[0110] S6: Determine the current electromagnetic parameters of the current iteration as the equivalent electromagnetic parameters.

[0111] S7: Based on the electromagnetic parameter range, perform crossover and mutation on the current electromagnetic parameters of the current iteration to obtain optimized electromagnetic parameters. Determine the optimized electromagnetic parameters as the current electromagnetic parameters for the next iteration, and return to step S3.

[0112] It should be noted that the similarity between the first scattering parameters and the second scattering parameters is the proximity degree between the two, and the similarity can be calculated through the following formula:

[0113]

[0114] where f is the similarity; S is the first scattering parameter; S' is the second scattering parameter.

[0115] Since the scattering parameters include the reflection coefficient and the transmission coefficient, there are two similarity values, that is, there are two fitness values. Then step S5 is specifically: determine whether the fitness values are both not less than the preset proximity threshold. That is to say, when the fitness values corresponding to the reflection coefficient and the transmission coefficient both meet the judgment conditions of S5, the current electromagnetic parameters of the current iteration are determined as the equivalent electromagnetic parameters.

[0116] In the embodiments of the present invention, based on the equivalent homogenized medium model, a genetic algorithm is introduced. The first scattering parameters calculated by the simulation in step 104 are used as the true scattering parameters. The genetic algorithm is used to continuously change the current electromagnetic parameters of each iteration, and the fitness (i.e., similarity) between the second scattering parameters calculated by the current electromagnetic parameters and the first scattering parameters is compared until the fitness is greater than or equal to the preset proximity threshold, and the iteration process is ended to obtain the optimal equivalent electromagnetic parameters. In this way, by introducing the genetic algorithm, the time for gradually searching and determining the equivalent electromagnetic parameters within the electromagnetic parameter range is significantly shortened.

[0117] In the present invention, the electromagnetic parameters of hollow fabric composites with different organizational structures can be quickly obtained through two simulation calculations, without the need to obtain electromagnetic parameters by making samples. Secondly, through the equivalent homogenization model for electrical performance simulation calculation, the amount of simulation calculation can be effectively reduced, the material design and development cycle and cost can be shortened, and the design efficiency can be improved.

[0118] In order to more clearly illustrate the technical solutions and advantages of the present invention, the calculation method of the equivalent electromagnetic parameters of a hollow fabric composite material will be described in detail through several embodiments below.

[0119] Example 1

[0120] (1) Perform three-dimensional modeling on the hollow fabric to obtain a single-cell structure model of the fiber fabric:

[0121] The hollow fabric with a thickness of 5 mm is an integral layer-connected hollow fabric formed by integrally weaving alkali-free glass fiber yarns, including an upper layer with a thickness of 0.5 mm, a core layer with a thickness of 4 mm, and a lower layer with a thickness of 0.5 mm; the upper layer, the lower layer, and the pile warp are all obtained by interweaving warp yarns and weft yarns in sequence, and the pile warp penetrates the upper layer and the lower layer to form a core layer with a cavity;

[0122] Among them, the linear density of the alkali-free glass fiber yarn is 136 tex, and the diameter of the single-filament fiber is 9.1 μm;

[0123] Both the upper layer and the lower layer are plain weave structures, with a warp density of 10 roots / cm and a weft density of 12 roots / cm; the pile warp structure of the core layer is in the shape of an "8", as Figure 2 shown;

[0124] (2) Perform three-dimensional modeling on the hollow fabric composite material obtained by compounding the hollow fabric and the matrix material to obtain a single-cell structure model of the composite material:

[0125] Select epoxy resin as the matrix material. The fiber volume content in the hollow fabric composite material is 60%, and the volume content of epoxy resin is 40%. Establish a single-cell structure model of the composite material as Figure 3 shown;

[0126] (3) Perform simulation calculations on the single-cell structure model of the composite material to obtain the first scattering parameter of the hollow fabric composite material:

[0127] Import the composite material unit cell structure model into HFSS software or call the HFSS algorithm. In a rectangular air box, use the rectangular waveguide method, set the two sets of sides of the model as master-slave boundary conditions to simulate the periodic structure. At the same time, set the frequency band and scanning angle (to simulate the incident angle of the plane wave) in the boundary conditions. Set both the top and bottom of the model as Floquet port excitations. Then determine the electromagnetic parameters of E-glass fiber and epoxy resin (the relative permittivity of E-glass fiber ε = 6.13, the loss tangent tanδ = 0.004; the relative permittivity of epoxy resin ε = 3.8, the loss tangent tanδ = 0.02). Through simulation calculation of the model, obtain the first scattering parameters (including the first reflection coefficient and the first transmission coefficient) of the two-port network.

[0128] (4) Establish an equivalent homogenized medium model of the hollow fabric composite material:

[0129] Equivalently represent the outer shape structure size of the 5-mm hollow fabric composite material as a 1-layer 5-mm equivalent single-layer homogenized medium unit cell model (as Figure 5 shown). Then call the HFSS algorithm, and set the boundary conditions and Floquet port excitations according to step (3). Set the solution type (mode-driven solution) and solution settings (frequency band, scanning angle for simulating the incident angle of the plane wave).

[0130] (5) Conduct simulation calculations on the equivalent homogenized medium model to obtain equivalent electromagnetic parameters:

[0131] S1: Based on the equivalent homogenized medium model in step (4), introduce the genetic algorithm, and define the electromagnetic parameter range (including the relative permittivity range and the loss tangent range), the preset proximity threshold, and the initial electromagnetic parameters.

[0132] S2: Take the initial electromagnetic parameters as the current electromagnetic parameters for the current iteration.

[0133] S3: Under the current electromagnetic parameters, use the HFSS algorithm to conduct simulation calculations on the equivalent homogenized medium model to obtain the second scattering parameters.

[0134] S4: Calculate the similarity between the first scattering parameters and the second scattering parameters, and determine the similarity as the fitness.

[0135] S5: Determine whether the fitness is not less than the preset proximity threshold. If so, execute step S6; otherwise, execute step S7.

[0136] S6: Determine the current electromagnetic parameters of the current iteration as the equivalent electromagnetic parameters and end the current process.

[0137] S7: Cross and mutate the current electromagnetic parameters of the current iteration based on the electromagnetic parameter range to obtain optimized electromagnetic parameters. Determine the optimized electromagnetic parameters as the current electromagnetic parameters for the next iteration, and return to step S3;

[0138] Among them, after performing the above simulation calculations at different frequency bands, the comparison curve graphs of the first scattering parameters (including the true reflection coefficient and the true transmission coefficient) as shown in Figure 6 and Figure 7 and the second scattering parameters (equivalent reflection coefficient and equivalent transmission coefficient) that meet the S5 judgment condition are obtained;

[0139] Derive the current electromagnetic parameters of the second scattering parameters that meet the S5 judgment condition, that is, derive the equivalent electromagnetic parameters of the hollow fabric composite material with a thickness of 5 mm: the equivalent dielectric constant ε = 1.59 - 1.65, and the equivalent loss tangent value tanδ ≤ 0.009.

[0140] It should be noted that the simulation calculation process in step (3) is a simulation calculation process verified by a hollow fabric composite material with a thickness of 3 mm (the same as the hollow fabric composite material in Example 1, only the thickness of the core layer is different, and the thickness of this core layer is 2 mm). The scattering parameters obtained from this simulation calculation process are the same as the true scattering parameters obtained by testing the composite material sample.

[0141] It should be noted that Figure 6 and Figure 7 in, real represents the first scattering parameter; equal represents the second scattering parameter.

[0142] Examples 2 - 6

[0143] Examples 2 - 6 are basically the same as Example 1, and the difference lies in that: in steps (1) and (2), hollow fabric composite materials with different structures are designed.

[0144] The calculation results of the equivalent electromagnetic parameters of the hollow fabric composite materials in Examples 1 - 6 are shown in Table 1.

[0145] Table 1

[0146]

[0147] As Figure 8 , Figure 9 shown, the embodiments of the present invention provide a calculation device for the equivalent electromagnetic parameters of a hollow fabric composite material. The device embodiments can be implemented by software, or by hardware or a combination of software and hardware. From the hardware level, as Figure 8 shown, it is a hardware architecture diagram of a computing device where the calculation device for the equivalent electromagnetic parameters of a hollow fabric composite material provided by the embodiments of the present invention is located. Except forFigure 8 In addition to the processor, memory, network interface, and non-volatile memory shown, the computing device where the device is located in the embodiment usually may also include other hardware, such as a forwarding chip responsible for processing packets, and so on. Taking software implementation as an example, as Figure 9 shown, as a logically meaningful device, it is formed by the CPU of the computing device where it is located reading the corresponding computer program in the non-volatile memory into the memory and running it. A computing device for calculating the equivalent electromagnetic parameters of a hollow fabric composite material provided in this embodiment includes:

[0148] A first construction module 900, configured to perform three-dimensional modeling on the hollow fabric to obtain a fiber fabric unit cell structure model; wherein, the hollow fabric is obtained by integral weaving and sequentially includes an upper layer, a core layer with a cavity, and a lower layer;

[0149] A second construction module 902, configured to perform three-dimensional modeling on the hollow fabric composite material obtained by compounding the hollow fabric and the matrix material based on the fiber fabric unit cell structure model to obtain a composite material unit cell structure model;

[0150] A first simulation module 904, configured to perform simulation calculation on the composite material unit cell structure model to obtain the first scattering parameters of the hollow fabric composite material;

[0151] An equivalent module 906, configured to establish an equivalent homogenized medium model of the hollow fabric composite material;

[0152] A second simulation module 908, configured to perform simulation calculation on the equivalent homogenized medium model according to the first scattering parameters to obtain the equivalent electromagnetic parameters of the hollow fabric composite material.

[0153] In some specific implementation manners, the first construction module 900 may be configured to execute the above step 100, the second construction module 902 may be configured to execute the above step 102, the first simulation module 904 may be configured to execute the above step 104, the equivalent module 906 may be configured to execute the above step 104, and the second simulation module 908 may be configured to execute the above step 104.

[0154] In some specific implementation manners, the first construction module 900 is further configured to perform the following operations:

[0155] Determine the structural characteristic parameters of the hollow fabric, where the structural characteristic parameters include the linear density of the fiber yarn used, the single fiber diameter of the fiber yarn, the radial density of the warp yarn, the weft density of the weft yarn, the number of interlacing points and the positions of the intersection points where the pile warp passes through the upper layer, the number of interlacing points and the positions of the intersection points where the pile warp passes through the lower layer;

[0156] Perform three-dimensional modeling according to the structural characteristic parameters to obtain a fiber fabric unit cell structure model.

[0157] In some specific embodiments, the second construction module 902 is further configured to perform the following operations:

[0158] Determine the type of matrix material and the fiber content in the hollow fabric composite material;

[0159] Perform three-dimensional modeling based on the fiber fabric unit cell structure model according to the type of matrix material and the fiber content to obtain a composite material unit cell structure model.

[0160] In some specific embodiments, the first simulation module 904 is further configured to perform the following operations:

[0161] Set the periodic boundary conditions and Floquet port excitation of the hollow fabric composite material by using the rectangular waveguide method;

[0162] According to the periodic boundary conditions, the Floquet port excitation and the composite material unit cell structure model, obtain a three-dimensional model of the hollow fabric composite material;

[0163] Perform simulation calculations on the three-dimensional model according to the electromagnetic parameters of the fibers used in the hollow fabric and the electromagnetic parameters of the matrix material to obtain the first scattering parameter; wherein, the electromagnetic parameters include the dielectric constant, the loss tangent value and the magnetic permeability.

[0164] In some specific embodiments, the first simulation module 904 is further configured to perform the following operations:

[0165] Obtain the true scattering parameter of the hollow fabric composite material with a thickness not greater than 3 mm obtained by testing;

[0166] Optimize the simulation calculation according to the true scattering parameter until the first scattering parameter is the same as the true scattering parameter.

[0167] In some specific embodiments, the equivalent module 906 is further configured to perform the following operations:

[0168] Perform multi-layer homogenization equivalent modeling on the hollow fabric composite material to obtain an equivalent multi-layer homogenized medium model including an upper layer equivalent model, a core layer equivalent model and a lower layer equivalent model.

[0169] In some specific embodiments, the equivalent module 906 is further configured to perform the following operations:

[0170] Perform multi-layer homogenization equivalent modeling on the hollow fabric composite material to obtain an equivalent multi-layer homogenized medium model including an upper layer equivalent model, a core layer equivalent model and a lower layer equivalent model.

[0171] In some specific embodiments, the second simulation module 908 is further configured to perform the following operations:

[0172] S1: Determine the electromagnetic parameter range, preset proximity threshold, and initial electromagnetic parameters based on the hollow fabric composite material; wherein, the electromagnetic parameter range includes the dielectric constant range and the loss tangent value range;

[0173] S2: Take the initial electromagnetic parameters as the current electromagnetic parameters for the current iteration;

[0174] S3: Under the current electromagnetic parameters, use the HFSS algorithm to perform simulation calculations on the equivalent homogenized medium model to obtain the second scattering parameters;

[0175] S4: Calculate the similarity between the first scattering parameters and the second scattering parameters, and determine the similarity as the fitness;

[0176] S5: Determine whether the fitness is not less than the preset proximity threshold. If so, execute step S6; otherwise, execute step S7;

[0177] S6: Determine the current electromagnetic parameters of the current iteration as the equivalent electromagnetic parameters;

[0178] S7: Based on the electromagnetic parameter range, perform crossover and mutation on the current electromagnetic parameters of the current iteration to obtain optimized electromagnetic parameters. Determine the optimized electromagnetic parameters as the current electromagnetic parameters for the next iteration, and return to step S3.

[0179] It can be understood that the structure schematically shown in the embodiments of the present invention does not constitute a specific limitation on the calculation device for the equivalent electromagnetic parameters of a hollow fabric composite material. In other embodiments of the present invention, a calculation device for the equivalent electromagnetic parameters of a hollow fabric composite material may include more or fewer components than shown in the figure, or combine certain components, or split certain components, or have different component arrangements. The components shown in the figure can be implemented in hardware, software, or a combination of software and hardware.

[0180] Regarding the information interaction, execution process, etc. between the various modules in the above device, since it is based on the same concept as the method embodiments of the present invention, the specific content can be referred to the description in the method embodiments of the present invention and will not be elaborated here.

[0181] The embodiments of the present invention also provide a computing device, including a memory and a processor. A computer program is stored in the memory. When the processor executes the computer program, it implements the method for calculating the equivalent electromagnetic parameters of a hollow fabric composite material in any embodiment of the present invention.

[0182] The embodiments of the present invention also provide a computer-readable storage medium. A computer program is stored on the computer-readable storage medium. When the computer program is executed by the processor, it causes the processor to execute the method for calculating the equivalent electromagnetic parameters of a hollow fabric composite material in any embodiment of the present invention.

[0183] An embodiment of the present application further provides a computer program product, which includes a computer program. The processor of the computer device reads the computer program from a computer-readable storage medium, and the processor executes the computer program, so that the computer device executes the method for calculating the equivalent electromagnetic parameters of a hollow fabric composite material described in any one of the above embodiments.

[0184] Specifically, a system or device equipped with a storage medium can be provided. Software program codes for implementing the functions of any one of the above embodiments are stored on the storage medium, and the computer (or CPU or MPU) of the system or device reads and executes the program codes stored in the storage medium.

[0185] In this case, the program code read from the storage medium itself can implement the functions of any one of the above embodiments. Therefore, the program code and the storage medium storing the program code constitute a part of the present invention.

[0186] Embodiments of the storage medium for providing program codes include floppy disks, hard disks, magneto-optical disks, optical disks (such as CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), magnetic tapes, non-volatile memory cards, and ROMs. Optionally, the program code can be downloaded from a server computer via a communication network.

[0187] A computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. Such a propagated data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, system, or device.

[0188] The program code contained on a computer-readable medium can be transmitted using any appropriate medium, including but not limited to wireless, wire, optical fiber, RF, etc., or any suitable combination of the above.

[0189] Computer program code for performing the operations of the present invention may be written in one or more programming languages or combinations thereof. The programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, executed as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., connected through the Internet using an Internet service provider).

[0190] In addition, it should be clear that not only can the above functions of any one of the above embodiments be realized by executing the program code read by the computer, but also by causing an operating system or the like operating on the computer based on the instructions of the program code to complete part or all of the actual operations.

[0191] In addition, it can be understood that the program code read from the storage medium is written into the memory provided in the expansion board inserted into the computer or into the memory provided in the expansion module connected to the computer, and then based on the instructions of the program code, the CPU or the like installed on the expansion board or the expansion module is caused to execute part and all of the actual operations, thereby realizing the functions of any one of the above embodiments.

[0192] It should be noted that in this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0193] Those of ordinary skill in the art can understand that all or part of the steps of implementing the above method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps including those of the above method embodiments. The aforementioned storage medium includes various media that can store program codes, such as ROM, RAM, magnetic disks, or optical discs.

[0194] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for calculating equivalent electromagnetic parameters of hollow fabric composite materials, characterized in that: include: The hollow fabric is three-dimensionally modeled to obtain a fiber fabric unit cell structure model; wherein the hollow fabric is obtained by integral weaving and sequentially comprises an upper layer, a core layer having a cavity, and a lower layer; Based on the fiber fabric unit cell structure model, three-dimensional modeling is performed on the hollow fabric composite material obtained by compounding the hollow fabric and the matrix material to obtain a composite material unit cell structure model; Performing simulation calculation on the composite material unit cell structure model to obtain a first scattering parameter of the hollow fabric composite material; Establishing an equivalent homogenized medium model of the hollow fabric composite material; The equivalent homogenized medium model is simulated and calculated according to the first scattering parameter to obtain equivalent electromagnetic parameters of the hollow fabric composite material.

2. The method according to claim 1, characterized in that The upper layer, the lower layer and the pile warp are all obtained by interweaving warp yarns and weft yarns in sequence, and the pile warp runs through the upper layer and the lower layer to form the core layer with a cavity; The three-dimensional modeling of the hollow fabric to obtain a fiber fabric unit cell structure model includes: Determining structural characteristic parameters of the hollow fabric, wherein the structural characteristic parameters include the linear density of the fiber yarn used, the monofilament fiber diameter of the fiber yarn, the radial density of the warp yarn, the weft density of the weft yarn, the number of interlacing points and the intersection position of the pile warp passing through the upper layer, and the number of interlacing points and the intersection position of the pile warp passing through the lower layer; Perform three-dimensional modeling according to the structural characteristic parameters to obtain the fiber fabric unit cell structure model; and / or, Based on the fiber fabric unit cell structure model, three-dimensional modeling is performed on the hollow fabric composite material obtained by compounding the hollow fabric and the matrix material to obtain a composite material unit cell structure model, including: determining the type of the matrix material and the fiber content in the hollow fabric composite material; According to the type of the matrix material and the fiber content, three-dimensional modeling is performed on the basis of the fiber fabric unit cell structure model to obtain the composite material unit cell structure model.

3. The method according to claim 1, characterized in that The fiber used in the hollow fabric is at least one of glass fiber, quartz fiber, low dielectric fiber, polyimide fiber, aramid fiber, carbon fiber and metal fiber; and / or, The matrix material is a resin matrix, a carbide ceramic matrix, an oxide ceramic matrix, or a nitride ceramic matrix.

4. The method according to claim 1, characterized in that: The step of performing simulation calculation on the composite unit cell structure model to obtain a first scattering parameter of the hollow fabric composite material includes: A rectangular waveguide method is used to set periodic boundary conditions and Floquet port excitation of the hollow fabric composite material; Obtaining a three-dimensional model of the hollow fabric composite material according to the periodic boundary conditions, the Floquet port excitation and the composite unit cell structure model; The three-dimensional model is simulated and calculated according to the electromagnetic parameters of the fibers used in the hollow fabric and the electromagnetic parameters of the matrix material to obtain the first scattering parameters; wherein the electromagnetic parameters include dielectric constant, loss tangent value and magnetic permeability.

5. The method according to claim 1, characterized in that The establishing of the equivalent homogenized medium model of the hollow fabric composite material comprises: Performing multi-layer homogenization equivalent modeling on the hollow fabric composite material to obtain an equivalent multi-layer homogenization medium model including an upper layer equivalent model, a core layer equivalent model and a lower layer equivalent model; or, The hollow fabric composite material is subjected to single-layer homogenization equivalent modeling to obtain an equivalent single-layer homogenization medium model.

6. The method according to claim 1, characterized in that The step of performing simulation calculation on the equivalent homogenized medium model according to the first scattering parameter to obtain equivalent electromagnetic parameters of the hollow fabric composite material includes: S1: Determine an electromagnetic parameter range, a preset proximity threshold, and an initial electromagnetic parameter according to the hollow fabric composite material; wherein the electromagnetic parameter range includes a dielectric constant range and a loss tangent value range; S2: using the initial electromagnetic parameters as current electromagnetic parameters of the current iteration; S3: Under the current electromagnetic parameters, using the HFSS algorithm to perform simulation calculation on the equivalent homogenized medium model to obtain a second scattering parameter; S4: calculating the similarity between the first scattering parameter and the second scattering parameter, and determining the similarity as fitness; S5: Determine whether the fitness is not less than the preset proximity threshold, if so, execute step S6; otherwise, execute step S7; S6: Determine the current electromagnetic parameters of the current iteration as the equivalent electromagnetic parameters; S7: Based on the electromagnetic parameter range, the current electromagnetic parameters of the current iteration are cross-referenced and mutated to obtain optimized electromagnetic parameters, the optimized electromagnetic parameters are determined as the current electromagnetic parameters of the next iteration, and the process returns to step S3.

7. The method according to any one of claims 1 to 6, characterized in that: The performing simulation calculation on the composite unit cell structure model to obtain the first scattering parameter of the hollow fabric composite material also includes: Obtaining the true scattering parameters of the hollow fabric composite material having a thickness not greater than 3 mm obtained by testing; The simulation calculation is optimized according to the real scattering parameter until the first scattering parameter is the same as the real scattering parameter.

8. A device for calculating equivalent electromagnetic parameters of hollow fabric composite materials, characterized in that: include: The first building module is used to perform three-dimensional modeling on the hollow fabric to obtain a fiber fabric unit cell structure model; wherein the hollow fabric is obtained by integral weaving and sequentially comprises an upper layer, a core layer with a cavity and a lower layer; The second construction module is used to perform three-dimensional modeling on the hollow fabric composite material obtained by compounding the hollow fabric and the matrix material based on the fiber fabric unit cell structure model to obtain a composite material unit cell structure model; A first simulation module is used to perform simulation calculation on the composite material unit cell structure model to obtain a first scattering parameter of the hollow fabric composite material; An equivalent module, used to establish an equivalent homogenized medium model of the hollow fabric composite material; The second simulation module is used to perform simulation calculation on the equivalent homogenized medium model according to the first scattering parameters to obtain equivalent electromagnetic parameters of the hollow fabric composite material.

9. A computing device, comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, which, when executed in a computer, causes the computer to execute the method according to any one of claims 1 to 7.

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