A method and device for calculating equivalent electromagnetic parameters of hollow fabric composite materials

Abstract

The present invention provides a method and device for calculating the equivalent electromagnetic parameters of a hollow fabric composite material. The method comprises: performing 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 comprises an upper layer, a core layer having a cavity, and a lower layer; based on the fiber fabric unit cell structure model, performing three-dimensional modeling on the hollow fabric composite material, which is a composite of the hollow fabric and a matrix material, to obtain a composite material unit cell structure model; performing simulation calculations 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; and performing simulation calculations on the equivalent homogenized medium model based on the first scattering parameter to obtain the equivalent electromagnetic parameters of the hollow fabric composite material. This solution not only enables the rapid acquisition of the equivalent electromagnetic parameters of hollow fabric composite materials of different structures, but also effectively improves the calculation precision and accuracy of the electromagnetic parameters.

Description

Technical Field

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

[0002] Hollow fabric composites are a new type of composite material with integrated structure and function. Due to their advantages such as light weight, high strength, customizable performance, and monolithic manufacturing, they also possess properties such as heat insulation, high and low temperature resistance, corrosion resistance, wave transmission, and wave absorption. They can also adapt to special environmental requirements and are widely used in the electronic information field. Hollow fabric composites are made by combining hollow fabric and a matrix material. The hollow fabric is woven as a whole using a special process. The upper and lower layers and the pile warp are respectively interwoven with warp yarns (ground warp yarns and pile warp yarns) and weft yarns. The pile warp runs through the upper and lower layers and the middle core layer, forming a multi-layer structure with a certain cavity height.

[0003] While traditional honeycomb sandwich structures can obtain electromagnetic parameters for each layer of structural material, hollow fabric composites, as a continuous, multi-layered, heterogeneous material, are difficult to obtain electromagnetic parameters for each layer. These parameters can only be obtained through overall structural testing. However, due to limited testing conditions and test cycle restrictions, the electromagnetic parameters of hollow fabric composites with different structures are difficult to obtain effectively and quickly. Furthermore, the velvet warps in the core layer of hollow fabric composites exhibit a spatially crisscrossed arrangement, making it difficult to directly calculate the equivalent electromagnetic parameters of the composite material using traditional classical effective medium theory. Currently, there is no clear method for quickly obtaining the electromagnetic parameters of hollow fabric composites with different structures without overall structural testing. Summary of the Invention

[0004] In order to solve the above problems, an embodiment of the present invention provides a method and device for calculating the equivalent electromagnetic parameters of a hollow fabric composite material. The method realizes the calculation of its equivalent electromagnetic parameters through a microstructure model of the hollow fabric composite material. It 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, an embodiment of the present invention provides a method for calculating equivalent electromagnetic parameters of a hollow fabric composite material, comprising:

[0006] Performing 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 having a cavity, and a lower layer;

[0007] Based on the fiber fabric unit cell structure model, a three-dimensional model 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;

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

[0009] Establishing an equivalent homogenized medium model of the hollow fabric composite material;

[0010] 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.

[0011] Optionally, the upper layer, the lower layer and the pile warp are all obtained by sequentially interweaving warp yarns and weft yarns, and the pile warp penetrates the upper layer and the lower layer to form the core layer having a cavity;

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

[0013] Determining structural characteristic parameters of the hollow fabric, wherein the structural characteristic parameters include the linear density of the fiber yarns used, the monofilament 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 intersection positions of the pile warps passing through the upper layer, and the number of interlacing points and intersection positions of the pile warps passing through the lower layer;

[0014] Three-dimensional modeling is performed 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 obtained by compounding the hollow fabric and the matrix material based on the fiber fabric unit cell structure model to obtain the composite material unit cell structure model includes:

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

[0017] Three-dimensional modeling is performed 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, the performing simulation calculation on the composite material unit cell structure model to obtain the first scattering parameter of the hollow fabric composite material includes:

[0021] A rectangular guided wave method is used to set periodic boundary conditions and Floquet port excitation of the hollow fabric composite material;

[0022] Obtaining a 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] 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.

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

[0025] Multi-layer homogenization equivalent modeling is performed 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.

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

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

[0028] Optionally, the 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:

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

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

[0031] S3: Under the current electromagnetic parameters, using the HFSS algorithm to simulate the equivalent homogenized medium model to obtain a second scattering parameter;

[0032] S4: calculating the similarity between the first scattering parameter and the second scattering parameter, and determining the similarity as 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, 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.

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

[0038] The simulation calculation is optimized according to the real scattering parameter until the first scattering parameter is the same as the real scattering parameter.

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

[0040] 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 includes an upper layer, a core layer with a cavity, and a lower layer;

[0041] A second construction module is used to perform three-dimensional modeling on a 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;

[0042] A first simulation module is used to simulate and calculate the composite material unit cell structure model to obtain a first scattering parameter of the hollow fabric composite material;

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

[0044] 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 textile composite material.

[0045] In a third aspect, an embodiment of the present invention further provides a computing device comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, it implements the method for calculating the equivalent electromagnetic parameters of the hollow fabric composite material as described in any one of the above items.

[0046] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed in a computer, the computer is caused to execute any of the above-mentioned methods for calculating the equivalent electromagnetic parameters of the hollow fabric composite material.

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

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

[0049] (1) The present invention provides a method and device for calculating equivalent electromagnetic parameters of a hollow fabric composite material. The method obtains a fiber fabric unit cell structure model by performing three-dimensional modeling on the hollow fabric. Then, based on the model, the unit cell structure model of the composite material of the hollow fabric composite material is established in combination with the structural characteristics of the hollow fabric and the matrix material after composite molding. The composite material unit cell structure model is then simulated and calculated to obtain a first scattering parameter. An equivalent homogenized medium model of the hollow fabric composite material is then established. The equivalent homogenized medium model is simulated and calculated based on the first scattering parameter to finally obtain the equivalent electromagnetic parameters. In this way, the present invention improves the calculation precision and accuracy of the equivalent electromagnetic parameters by using two simulation calculation methods after accurate three-dimensional modeling. At the same time, there is no need to obtain electromagnetic parameters through sample preparation and 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 microstructure model of the hollow fabric, fully considering the influence of material structure parameters such as fiber type, fiber parameters, the organizational structure of the hollow fabric, the type of matrix material and fiber content on the electromagnetic parameters, so that the fiber fabric unit cell structure model and the composite material unit cell structure model are closest to the structure of the real hollow fabric and 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 organizational structures can be quickly obtained through the calculation method of equivalent electromagnetic parameters, without the need to obtain electromagnetic parameters through sample preparation; secondly, the electrical performance simulation calculation is performed through the equivalent homogenization model, which can effectively reduce the amount of simulation calculation, shorten the material design and development cycle and cost, and improve design efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0053] Figure 1 This is a flow chart of a method for calculating equivalent electromagnetic parameters of a hollow fabric composite material provided by one embodiment of the present invention;

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

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

[0056] Figure 4 1 is a schematic structural diagram of an equivalent multi-layer homogenized medium unit cell model provided by one embodiment of the present invention;

[0057] Figure 5 1 is a schematic structural diagram of an equivalent single-layer homogenized medium unit cell model provided by one embodiment of the present invention;

[0058] Figure 6 1 is a comparison curve diagram of the real reflection coefficient and the equivalent reflection coefficient in different frequency bands provided by an embodiment of the present invention;

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

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

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

[0062] Figure numerals: 201 - upper layer; 202 - core layer; 203 - lower layer; 301 - upper layer of hollow fabric composite material; 302 - core layer of hollow fabric composite material; 303 - lower layer of 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

[0063] In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0064] The following is the concept of the present invention: Figure 1 As shown, an embodiment of the present invention provides a method for calculating equivalent electromagnetic parameters of a hollow fabric composite material, the method comprising:

[0065] Step 100: 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 having a cavity, and a lower layer;

[0066] Step 102: Based on the fiber fabric unit cell structure model, 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;

[0067] Step 104: performing simulation calculation on the composite material unit cell structure model to obtain a first scattering parameter of the hollow fabric composite material;

[0068] Step 106: establishing an equivalent homogenized medium model of the hollow fabric composite material;

[0069] Step 108 : 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.

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

[0071] Described below Figure 1 How to perform the steps shown.

[0072] In step 100, 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;

[0073] The hollow fabric is modeled in three dimensions to obtain a fiber fabric unit cell structure model, including:

[0074] Determining structural characteristic parameters of the hollow fabric, wherein the structural characteristic parameters include the linear density of the fiber yarns used, the diameter of the single filament 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 crossing points of the pile warps passing through the upper layer, and the number of interlacing points and the positions of the crossing points of the pile warps passing through the lower layer;

[0075] Three-dimensional modeling is performed based on structural characteristic parameters to obtain a fiber fabric unit cell structure model.

[0076] In an embodiment of the present invention, when three-dimensionally modeling the hollow fabric, the influence of structural characteristic parameters such as fiber type, fiber parameters (including the linear density of fiber yarn, the single fiber diameter of fiber yarn), and the organization structure of the hollow fabric (including the radial density of warp yarn, the weft density of weft yarn, the number of interweaving points and intersection positions of the velvet warp passing through the upper layer, and the number of interweaving points and intersection positions of the velvet warp passing through the lower layer) on the electromagnetic parameters is fully considered, so that the single-cell structure model of the fiber fabric 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 integral layered hollow fabric formed by integrated weaving; the structure of the core layer includes 8-type, W-type, V-type, π-type, O-type, II-type or X-type. Figure 2 As shown, the hollow fabric consists of an upper layer, an 8-type core layer and a lower layer. Figure 2 The figure shows a schematic diagram of the structure of a 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. For example, if the hollow fabric has two core layers, its structure can be specifically first surface layer-first core layer-second surface layer-second core layer-third surface layer, in which case the second surface layer is both the lower layer of the first core layer and the upper layer of the second core layer; or it can be two layers of hollow fabric stacked, namely first surface layer-first core layer-second surface layer-third surface layer-second core layer-fourth surface layer. It should be noted that the thickness 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 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.

[0079] It should be noted that at least one refers to any one or a mixture of any several in any proportion. Specifically, when the hollow fabric uses multiple fibers, the structural characteristic parameters also include the fiber composition of the warp yarn and the fiber composition of the weft yarn.

[0080] In step 102, based on the fiber fabric unit cell structure model, a three-dimensional model 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, including:

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

[0082] According to the type of matrix material and 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.

[0083] Specifically, the upper layer, core layer and lower layer of the hollow fabric are all coated with the matrix material, and the hollow fabric composite material is obtained by compounding; wherein the unit cell structure model of the composite material is as follows Figure 3 shown.

[0084] In an embodiment of the present invention, when three-dimensionally modeling the hollow fabric composite material, on the basis of the fiber fabric unit cell structure model, the influence of material structural parameters such as the type of matrix material and 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, acetylene resin and other resin matrices; the carbide ceramic matrix includes but is not limited to silicon carbide ceramic matrix, carbide ceramic matrix with silicon carbide as the main component, 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, a simulation calculation is performed on the composite unit cell structure model to obtain a first scattering parameter of the hollow fabric composite material, including:

[0088] The rectangular guided wave method is used to set the periodic boundary conditions and Floquet port excitation of the hollow fabric composite material;

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

[0090] 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.

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

[0092] In an embodiment of the present invention, by inputting the electromagnetic parameters of the fiber and matrix material used in the hollow fabric, the first scattering parameters of the hollow fabric composite material can be obtained by simulation calculation using the composite material unit cell structure model. The electromagnetic parameters of the fiber and matrix material can be directly obtained. Therefore, the first scattering parameters of the hollow fabric composite material of any structure can be directly obtained through this simulation calculation, and there is no need to obtain the scattering parameters through sample preparation and testing, so that the scattering parameters can be quickly obtained.

[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 from the test;

[0095] The simulation calculation is optimized according to the real scattering parameter until the first scattering parameter is the same as the real scattering parameter.

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

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

[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 is to 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, the multi-layer homogenization equivalent modeling of the hollow fabric composite material is carried out, and the following is obtained: Figure 4 The equivalent multi-layer homogenized medium unit cell model shown includes an equivalent model of an upper layer unit cell, an equivalent model of a core layer unit cell, and an equivalent model of a lower layer unit cell. Then, the rectangular guided wave method in step 104 is used to set the periodic boundary conditions and Floquet port excitation of the hollow fabric composite material. Based on the set periodic boundary conditions and Floquet port excitation, the equivalent multi-layer homogenized medium unit cell model is periodically cycled to obtain an equivalent multi-layer homogenized medium model of the hollow fabric composite material.

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

[0102] Specifically, the single-layer homogenization equivalent modeling of the hollow fabric composite material is carried out, and the following is obtained: Figure 5 The equivalent single-layer homogenized medium unit cell model shown is then constructed, and the rectangular guided wave method in step 104 is used to set the periodic boundary conditions and Floquet port excitation of the hollow fabric composite material. Based on the set periodic boundary conditions and Floquet port excitation, the equivalent single-layer homogenized medium unit cell model is periodically cycled 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 based on the specific application requirements of the hollow textile composite material. Specifically, step 106 can be directly written using MATLAB scripts to control the HFSS software to generate the equivalent homogenized medium model and perform analysis and solution.

[0104] In step 108, 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, including:

[0105] S1: Determine an electromagnetic parameter range, a preset proximity threshold, and initial electromagnetic parameters based on the hollow fabric composite material; wherein the electromagnetic parameter range includes a dielectric constant range and a loss tangent value range;

[0106] S2: Use the initial electromagnetic parameters as the current electromagnetic parameters of the current iteration;

[0107] S3: Under the current electromagnetic parameters, the HFSS algorithm is used to simulate the equivalent homogenized medium model to obtain the second scattering parameters;

[0108] S4: calculating the similarity between the first scattering parameter and the second scattering parameter, and determining the similarity as the fitness;

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

[0110] S6: determining the current electromagnetic parameters of the current iteration as equivalent electromagnetic parameters;

[0111] 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.

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

[0113]

[0114] Where, f is the similarity; S is the first scattering parameter; S' is the second scattering parameter;

[0115] Because the scattering parameters include the reflection coefficient and the transmission coefficient, there are two similarity values, that is, two fitness values. Therefore, step S5 specifically involves determining whether both fitness values ​​are not less than a preset proximity threshold. In other words, only when the fitness value corresponding to the reflection coefficient and the fitness value corresponding to the transmission coefficient both meet the judgment criteria of S5 are the current electromagnetic parameters of the current iteration determined to be equivalent electromagnetic parameters.

[0116] In this embodiment of the present invention, a genetic algorithm is introduced based on the equivalent homogenized medium model. The first scattering parameter simulated and calculated in step 104 is used as the actual scattering parameter. The genetic algorithm continuously changes the current electromagnetic parameter at each iteration and compares the fitness (i.e., similarity) of the second scattering parameter calculated based on the current electromagnetic parameter simulation with the first scattering parameter. The iteration ends until the fitness is greater than or equal to a preset proximity threshold, resulting in the optimal equivalent electromagnetic parameter. In this way, the introduction of the genetic algorithm significantly shortens the time required to gradually search and determine the equivalent electromagnetic parameter within the electromagnetic parameter range.

[0117] In the present invention, the electromagnetic parameters of hollow fabric composite materials with different organizational structures can be quickly obtained through two simulation calculations, without the need to obtain electromagnetic parameters through sample preparation; secondly, the electrical performance simulation calculation is performed through an equivalent homogenization model, which can effectively reduce the amount of simulation calculations, shorten the material design and development cycle and cost, and improve design efficiency.

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

[0119] Example 1

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

[0121] The 5mm thick hollow fabric is an integral layered hollow fabric woven from alkali-free glass fiber yarns. It includes a 0.5mm thick upper layer, a 4mm thick core layer, and a 0.5mm thick lower layer. The upper layer, lower layer, and pile warp are all interwoven with warp and weft yarns in sequence, and the pile warp runs through the upper and lower layers to form a core layer with a cavity.

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

[0123] The upper and lower layers are plain weave with a warp density of 10 strands / cm and a weft density of 12 strands / cm. The core layer has an 8-shaped velvet warp structure. Figure 2 As shown;

[0124] (2) Three-dimensional modeling of the hollow fabric composite material obtained by combining the hollow fabric and the matrix material is performed to obtain a unit cell structure model of the composite material:

[0125] Epoxy resin was selected as the matrix material. The volume content of fiber in the hollow fabric composite material was 60% and the volume content of epoxy resin was 40%. Figure 3 The composite unit cell structure model shown;

[0126] (3) The composite material unit cell structure model is simulated and the first scattering parameter of the hollow fabric composite material is obtained:

[0127] The composite unit cell structure model is imported into HFSS software or the HFSS algorithm is called. In a rectangular air box, the rectangular waveguide method is used to set two sets of side surfaces of the model as master and slave boundary conditions to simulate the periodic structure. At the same time, the frequency band and scanning angle (to simulate the incident angle of the plane wave) are set in the boundary conditions. The top and bottom of the model are set to Floquet port excitation. Then, the electromagnetic parameters of the alkali-free glass fiber and epoxy resin are determined (the dielectric constant of the alkali-free glass fiber is ε = 6.13, and the loss tangent value tanδ = 0.004; the dielectric constant of the epoxy resin is ε = 3.8, and the loss tangent value tanδ = 0.02). The first scattering parameters (including the first reflection coefficient and the first transmission coefficient) of the two-port network are obtained by simulation calculation of the model.

[0128] (4) Establish an equivalent homogenized medium model for hollow fabric composite materials:

[0129] The external structural dimensions of the 5mm hollow fabric composite material are equivalent to a 5mm equivalent single-layer homogenized medium unit cell model (such as Figure 5 As shown), then call the HFSS algorithm and set the boundary conditions and Floquet port excitation according to step (3), set the solution type (mode driven solution) and solution settings (frequency band, scanning angle of the incident angle of the simulated plane wave);

[0130] (5) Simulate the equivalent homogenized medium model to obtain the equivalent electromagnetic parameters:

[0131] S1: Based on the equivalent homogenized medium model in step (4), a genetic algorithm is introduced, and the electromagnetic parameter range (including the dielectric constant range and the loss tangent value range), the preset proximity threshold, and the initial electromagnetic parameters are defined;

[0132] S2: Use the initial electromagnetic parameters as the current electromagnetic parameters of the current iteration;

[0133] S3: Under the current electromagnetic parameters, the HFSS algorithm is used to simulate the equivalent homogenized medium model to obtain the second scattering parameters;

[0134] S4: calculating the similarity between the first scattering parameter and the second scattering parameter, and determining the similarity as the fitness;

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

[0136] S6: determining the current electromagnetic parameters of the current iteration as equivalent electromagnetic parameters, and ending the current process;

[0137] S7: performing crossover and mutation on the current electromagnetic parameters of the current iteration based on the electromagnetic parameter range to obtain optimized electromagnetic parameters, determining the optimized electromagnetic parameters as the current electromagnetic parameters of the next iteration, and returning to step S3;

[0138] Among them, after performing the above simulation calculations at different frequency bands, we can get the following Figure 6 and Figure 7 A comparison graph of the first scattering parameters (including the true reflection coefficient and the true transmission coefficient) and the second scattering parameters (equivalent reflection coefficient and equivalent transmission coefficient) that meet the S5 judgment condition is shown;

[0139] The current electromagnetic parameters of the second scattering parameters that meet the S5 judgment condition are derived, that is, the equivalent electromagnetic parameters of the hollow textile composite material with a thickness of 5 mm are derived: the equivalent dielectric constant ε = 1.59 ~ 1.65, 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 the core layer is 2 mm). The scattering parameters obtained by the simulation calculation process are the same as the actual scattering parameters obtained by the sample preparation test of the composite material.

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

[0142] Examples 2 to 6

[0143] Examples 2 to 6 are basically the same as Example 1, except that hollow fabric composite materials with different structures are designed in step (1) and step (2).

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

[0145] Table 1

[0146]

[0147] like Figure 8 、 Figure 9 As shown, an embodiment of the present invention provides a device for calculating the equivalent electromagnetic parameters of a hollow fabric composite material. The device embodiment can be implemented by software, hardware, or a combination of software and hardware. From the hardware level, Figure 8 As shown in FIG. 1 , a hardware architecture diagram of a computing device where a computing device for calculating equivalent electromagnetic parameters of a hollow fabric composite material provided by an embodiment of the present invention is located is shown. Figure 8 In addition to the processor, memory, network interface, and non-volatile memory shown, the computing device in the embodiment may also include other hardware, such as a forwarding chip responsible for processing messages, etc. Taking software implementation as an example, Figure 9 As shown, as a device in a logical sense, the CPU of the computing device in which it is located reads the corresponding computer program in the non-volatile memory into the internal memory and runs it. This embodiment provides a device for calculating the equivalent electromagnetic parameters of a hollow fabric composite material, including:

[0148] The first building block 900 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 includes an upper layer, a core layer having a cavity, and a lower layer;

[0149] The second building module 902 is used to perform three-dimensional modeling of the hollow fabric composite material obtained by combining 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 is used to simulate and calculate the composite material unit cell structure model to obtain a first scattering parameter of the hollow fabric composite material;

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

[0152] The second simulation module 908 is used to perform simulation calculation on the equivalent homogenized medium model according to the first scattering parameter to obtain equivalent electromagnetic parameters of the hollow textile composite material.

[0153] In some specific embodiments, the first construction module 900 can be used to perform the above step 100, the second construction module 902 can be used to perform the above step 102, the first simulation module 904 can be used to perform the above step 104, the equivalent module 906 can be used to perform the above step 104, and the second simulation module 908 can be used to perform the above step 104.

[0154] In some specific implementations, the first building module 900 is further configured to perform the following operations:

[0155] Determining structural characteristic parameters of the hollow fabric, wherein the structural characteristic parameters include the linear density of the fiber yarns used, the diameter of the single filament 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 crossing points of the pile warps passing through the upper layer, and the number of interlacing points and the positions of the crossing points of the pile warps passing through the lower layer;

[0156] Three-dimensional modeling is performed based on structural characteristic parameters to obtain a fiber fabric unit cell structure model.

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

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

[0159] According to the type of matrix material and 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.

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

[0161] The rectangular guided wave method is used to set the periodic boundary conditions and Floquet port excitation of the hollow fabric composite material;

[0162] Based on periodic boundary conditions, Floquet port excitation and composite unit cell structure model, a three-dimensional model of hollow fabric composite material is obtained;

[0163] 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.

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

[0165] Obtain the true scattering parameters of the hollow fabric composite material with a thickness not greater than 3 mm obtained from the test;

[0166] The simulation calculation is optimized according to the real scattering parameter until the first scattering parameter is the same as the real scattering parameter.

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

[0168] Multi-layer homogenization equivalent modeling is performed 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 implementations, the equivalent module 906 is further configured to perform the following operations:

[0170] Multi-layer homogenization equivalent modeling is performed 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 implementations, the second simulation module 908 is further configured to perform the following operations:

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

[0173] S2: Use the initial electromagnetic parameters as the current electromagnetic parameters of the current iteration;

[0174] S3: Under the current electromagnetic parameters, the HFSS algorithm is used to simulate the equivalent homogenized medium model to obtain the second scattering parameters;

[0175] S4: calculating the similarity between the first scattering parameter and the second scattering parameter, and determining the similarity as the fitness;

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

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

[0178] 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.

[0179] It should be understood that the structure illustrated in the embodiments of the present invention does not constitute a specific limitation on the device for calculating the equivalent electromagnetic parameters of a hollow textile composite material. In other embodiments of the present invention, the device for calculating the equivalent electromagnetic parameters of a hollow textile composite material may include more or fewer components than illustrated, or may combine or separate certain components, or employ different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of both.

[0180] The information interaction, execution process, etc. between the modules in the above-mentioned device are based on the same concept as the embodiment of the method of the present invention. For specific contents, please refer to the description in the embodiment of the method of the present invention and will not be repeated here.

[0181] An embodiment of the present invention further provides a computing device comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, a method for calculating equivalent electromagnetic parameters of a hollow fabric composite material in any embodiment of the present invention is implemented.

[0182] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the processor executes a method for calculating equivalent electromagnetic parameters of a hollow fabric composite material according to any embodiment of the present invention.

[0183] An embodiment of the present application also provides a computer program product, which includes a computer program. A processor of a 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 a method for calculating the equivalent electromagnetic parameters of a hollow fabric composite material as described in any of the above embodiments.

[0184] Specifically, a system or device equipped with a storage medium can be provided, on which software program codes that implement the functions of any of the above-mentioned embodiments are stored, and a computer (or CPU or MPU) of the system or device can be enabled to read and execute the program codes stored in the storage medium.

[0185] In this case, the program code itself read from the storage medium can realize the function of any one of the above-mentioned embodiments, and thus the program code and the storage medium storing the program code constitute part of the present invention.

[0186] Examples of storage media for providing program code 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. Alternatively, 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 baseband or as part of a carrier wave, which carries computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in conjunction with an instruction execution system, system, or device.

[0188] Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0189] Computer program code for performing the operations of the present invention may be written in one or more programming languages, or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, 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 cases involving 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., through the Internet using an Internet service provider).

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

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

[0192] It should be noted that, in this article, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical factors in the process, method, article or device comprising the elements.

[0193] Those skilled in the art will understand that all or part of the steps of implementing the above-mentioned method embodiment can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above-mentioned method embodiment; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk, etc. Various media that can store program codes.

[0194] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for calculating equivalent electromagnetic parameters of hollow fabric composite materials, characterized in that: include: Performing 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 having a cavity, and a lower layer; Based on the fiber fabric unit cell structure model, a three-dimensional model 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 calculations on the composite unit cell structure model to obtain first scattering parameters of the hollow fabric composite material, including: using a rectangular guided wave method to set periodic boundary conditions and Floquet port excitations for the hollow fabric composite material; obtaining a three-dimensional model of the hollow fabric composite material based on the periodic boundary conditions, the Floquet port excitations, and the composite unit cell structure model; and performing simulation calculations on the three-dimensional model based on electromagnetic parameters of fibers used in the hollow fabric and electromagnetic parameters of the matrix material to obtain first scattering parameters; wherein the electromagnetic parameters include dielectric constant, loss tangent, and permeability; 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, including: S1: determining an electromagnetic parameter range, a preset proximity threshold, and initial electromagnetic parameters 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 for the current iteration; S3: Under the current electromagnetic parameters, using the HFSS algorithm to simulate 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.

2. The method according to claim 1, characterized in that The upper layer, the lower layer and the pile warp are all obtained by sequentially interweaving warp yarns and weft yarns, and the pile warp runs through the upper layer and the lower layer to form the core layer having 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 yarns used, the monofilament 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 intersection positions of the pile warps passing through the upper layer, and the number of interlacing points and intersection positions of the pile warps passing through the lower layer; Three-dimensional modeling is performed according to the structural characteristic parameters to obtain the fiber fabric unit cell structure model.

3. The method according to claim 1, characterized in that The method of performing 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 the composite material unit cell structure model includes: determining the type of the matrix material and the fiber content of the hollow fabric composite material; Three-dimensional modeling is performed 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.

4. The method according to claim 1, wherein 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.

5. The method according to claim 1, wherein The matrix material is a resin matrix, a carbide ceramic matrix, an oxide ceramic matrix, or a nitride ceramic matrix.

6. The method according to claim 1, characterized in that The establishing of the equivalent homogenized medium model of the hollow fabric composite material comprises: Multi-layer homogenization equivalent modeling is performed 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.

7. The method according to claim 1, characterized in that The establishing of the equivalent homogenized medium model of the hollow fabric composite material comprises: A single-layer homogenized equivalent model is performed on the hollow fabric composite material to obtain an equivalent single-layer homogenized medium model.

8. The method according to any one of claims 1 to 7, characterized in that 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: Obtaining 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.

9. 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 includes an upper layer, a core layer with a cavity, and a lower layer; A second construction module is used to perform three-dimensional modeling on a 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 simulate and calculate the composite material unit cell structure model to obtain a first scattering parameter of the hollow fabric composite material; An equivalent module, used for establishing an equivalent homogenized medium model of the hollow fabric composite material; a second simulation module, configured 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; The first simulation module is further configured to perform the following operations: The rectangular guided wave method is used to set the periodic boundary conditions and Floquet port excitation of the hollow fabric composite material; Based on periodic boundary conditions, Floquet port excitation and composite unit cell structure model, a three-dimensional model of hollow fabric composite material is obtained; The three-dimensional model is simulated and calculated based on 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; The second simulation module is further configured to perform the following operations: S1: Determine an electromagnetic parameter range, a preset proximity threshold, and initial electromagnetic parameters based on the hollow fabric composite material; wherein the electromagnetic parameter range includes a dielectric constant range and a loss tangent value range; S2: Use the initial electromagnetic parameters as the current electromagnetic parameters of the current iteration; S3: Under the current electromagnetic parameters, the HFSS algorithm is used to simulate the equivalent homogenized medium model to obtain the second scattering parameters; S4: calculating the similarity between the first scattering parameter and the second scattering parameter, and determining the similarity as the fitness; S5: Determine whether the fitness is not less than a preset proximity threshold. If so, proceed to step S6; otherwise, proceed to step S7; S6: determining the current electromagnetic parameters of the current iteration as 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.

10. 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 8 is implemented.

11. 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 8.

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