Shielding cable shielding effectiveness optimization method, device, equipment and medium
By establishing a three-dimensional geometric solid model and bending-deformation coupled modeling, deformation parameters are calculated, and shielding effectiveness is evaluated and optimized. This solves the simulation error problem caused by deformation in traditional methods and improves the evaluation accuracy and optimization efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-29
- Publication Date
- 2026-04-07
AI Technical Summary
Traditional shielding effectiveness evaluation methods fail to effectively consider the bending and twisting deformations of cables caused by spatial constraints during vehicle wiring, leading to increased simulation errors.
By establishing a three-dimensional geometric solid model of the high-voltage shielded cable, bending-deformation coupling modeling is performed, deformation parameters are calculated, and the shielding effectiveness is evaluated based on the deformation parameters to identify unqualified points and perform optimization.
It improves the accuracy and optimization efficiency of shielding effectiveness assessment, and can effectively analyze the problem of shielding effectiveness attenuation caused by mechanical deformation.
Smart Images
Figure CN121809164A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of electromagnetic shielding, in particular to a shielding cable shielding effectiveness optimization method, device, equipment and medium. BACKGROUND
[0002] In the automotive electronic system, shielding cables are widely used to prevent electromagnetic interference and ensure the reliable operation of electronic devices. However, the traditional shielding effectiveness evaluation method is mostly based on theoretical calculation under ideal working conditions or shielding effectiveness test in the laboratory, which only simulates the transfer impedance of the straight section of the cable and does not consider the deformation such as bending and twisting caused by space constraints in the whole vehicle wiring, resulting in increased simulation error. SUMMARY
[0003] In view of the above-mentioned shortcomings of the prior art, the present application provides a shielding cable shielding effectiveness optimization method, device, equipment and medium to solve the above-mentioned technical problems.
[0004] The shielding cable shielding effectiveness optimization method provided by the present application comprises: obtaining cable parameters and establishing a three-dimensional geometric entity model of a high-voltage shielding cable based on the cable parameters; According to the three-dimensional geometric entity model, a bending-deformation coupling modeling is performed to calculate a deformation parameter; wherein the deformation parameter represents the microscopic geometric change of the shielding layer; evaluate the shielding effectiveness of the cable based on the deformation parameter; Compare the shielding effectiveness with the preset threshold value, and determine the shielding effectiveness unqualified point according to the comparison result; Optimize the shielding effectiveness unqualified point.
[0005] In an embodiment of the present application, the bending-deformation coupling modeling according to the three-dimensional geometric entity model to calculate the deformation parameter comprises: According to the center trajectory of the three-dimensional geometric entity model, the curvature and torsion rate of the cable are calculated; establish a coupled finite element model comprising shell elements and beam elements; Based on the curvature, the torsion rate and the coupled finite element model, the deformation structure of the cable in the bending state is simulated to obtain a finite element simulation result; According to the finite element simulation result, the deformation parameter is calculated.
[0006] In an embodiment of the present application, the finite element simulation result includes a deformed coupled finite element model, and the evaluation of the shielding effectiveness of the cable based on the deformation parameter comprises: The deformed coupled finite element model is meshed to obtain an electromagnetic simulation mesh; determine equivalent electromagnetic parameters based on the deformation parameter; perform electromagnetic field solving by using the electromagnetic simulation mesh and the equivalent electromagnetic parameters to obtain the shielding effectiveness of the cable.
[0007] In an embodiment of the present application, the equivalent electromagnetic parameters are equivalent surface impedance varying with frequency and position, and the value of the equivalent surface impedance is determined according to the deformation parameter through a pre-labeled mapping relationship.
[0008] In an embodiment of the present application, the deformation parameter includes: a local braid angle variation of the shielding layer; a local mesh opening area variation of the shielding layer.
[0009] In an embodiment of the present application, the establishment of the coupled finite element model including shell elements and beam elements includes: modeling the core, the insulating layer and the sheath of the cable as shell elements; discretizing the braided filaments of the shielding layer into beam elements; defining contact attributes and friction attributes between the beam elements and between the beam elements and the shell elements to construct a coupled finite element model based on the contact attributes and the friction attributes.
[0010] In an embodiment of the present application, the optimization of the shielding effectiveness unqualified point includes at least one of: increasing the curvature radius of the cable at the shielding effectiveness unqualified point; adjusting the bending angle of the cable at the shielding effectiveness unqualified point; replanning the wiring path.
[0011] The present application provides a shielding cable shielding effectiveness optimization device, which includes: a model construction module for obtaining cable parameters and establishing a three-dimensional geometric entity model of a high-voltage shielding cable based on the cable parameters; a deformation parameter calculation module for performing bending-deformation coupling modeling according to the three-dimensional geometric entity model to calculate a deformation parameter; wherein the deformation parameter represents the microscopic geometric changes of the shielding layer; a shielding effectiveness evaluation module for evaluating the shielding effectiveness of the cable based on the deformation parameter; an unqualified point positioning module for comparing the shielding effectiveness with a preset threshold and determining a shielding effectiveness unqualified point according to the comparison result; a shielding effectiveness optimization module for optimizing the shielding effectiveness unqualified point.
[0012] This application provides a shielding effectiveness optimization device for shielded cables, comprising: One or more processors; A storage device for storing one or more programs, which, when executed by one or more processors, enable the shielded cable shielding performance optimization device to implement a shielded cable shielding performance optimization method.
[0013] This application provides a computer-readable storage medium storing a computer program that, when executed by a computer's processor, causes the computer to perform a method for optimizing the shielding effectiveness of shielded cables.
[0014] The beneficial effects of this application are as follows: A method for optimizing the shielding effectiveness of shielded cables, comprising: acquiring cable parameters and establishing a three-dimensional geometric solid model of a high-voltage shielded cable based on the cable parameters; performing bending-deformation coupled modeling based on the three-dimensional geometric solid model to calculate deformation parameters; wherein the deformation parameters characterize the microscopic geometric changes of the shielding layer; evaluating the shielding effectiveness of the cable based on the deformation parameters; comparing the shielding effectiveness with a preset threshold and determining the unqualified points of shielding effectiveness based on the comparison results; and optimizing the unqualified points of shielding effectiveness. This application, by establishing a three-dimensional geometric solid model and a bending-deformation coupled model, obtains the microstructural changes of the shielding layer caused by deformation, and realizes quantitative evaluation of shielding effectiveness based on electromagnetic simulation, thereby optimizing the unqualified points of shielding effectiveness. This method effectively analyzes the shielding effectiveness attenuation problem caused by mechanical deformation in practical applications, improving evaluation accuracy and optimization efficiency.
[0015] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description
[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings: The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.
[0017] In the attached diagram: Figure 1This is a flowchart illustrating a method for optimizing the shielding effectiveness of a shielded cable according to an embodiment of this application; Figure 2 This is a schematic diagram of a three-dimensional geometric solid model according to an embodiment of this application; Figure 3 This is a cross-sectional view of a single-layer shielded cable model according to an embodiment of this application; Figure 4 This is a schematic diagram of the simulation results of the curve at the minimum shielding attenuation point according to an embodiment of this application; Figure 5 This is a schematic diagram of the simulation results of the curve at the minimum shielding attenuation point according to an embodiment of this application; Figure 6 This is a flowchart of a method for obtaining deformation parameters according to an embodiment of this application; Figure 7 This is a flowchart illustrating a shielding effectiveness evaluation according to an embodiment of this application; Figure 8 This is a schematic diagram of a shielded cable shielding effectiveness optimization device according to an embodiment of this application; Figure 9 A schematic diagram of a computer system suitable for implementing the memory of the embodiments of this application is shown. Detailed Implementation
[0018] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.
[0019] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the shape, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.
[0020] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present application. However, it will be apparent to those skilled in the art that embodiments of the present application may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present application.
[0021] Please see Figure 1 ,Figure 1 This is a flowchart illustrating a method for optimizing the shielding effectiveness of a shielded cable according to an embodiment of this application. The method includes at least steps S110 to S170, which are described in detail below: Step S110: Obtain cable parameters and establish a three-dimensional geometric solid model of the high-voltage shielded cable based on the cable parameters; In this step, the first step is to obtain the cable parameters required for modeling. Specifically, the cable parameters include geometric information and ontological attribute parameters.
[0022] Geometric information is obtained by receiving CAD (Computer-Aided Design) files from the vehicle. This geometric information includes center trajectory, cross-sectional layering, connector ports, etc. The center trajectory represents the path the cable winds through the vehicle body; connector ports indicate the start and end points of the cable, providing geometric locations for setting excitation and observation ports in subsequent electromagnetic simulations; and cross-sectional layering defines the material layer structure sequence and geometric dimensions from the inside out on the cable's cross-section.
[0023] Body attribute parameters: Obtain the specific geometric dimensions (such as diameter, thickness, etc.) and material physical properties (such as conductivity, dielectric constant, etc.) of the wire core, inner insulation layer, shielding layer, outer insulation layer, and sheath that make up the cable.
[0024] By integrating geometric information and ontological attribute parameters, a corresponding parametric 3D geometric solid model is established in the simulation environment. A schematic diagram of the 3D geometric solid model is shown below. Figure 2 As shown. The three-dimensional geometric solid model is a single-layer shielded cable model, and its cross-sectional view is as follows. Figure 3 As shown, the single-layer shielded cable model consists of five parts: core 2, inner insulation layer 3, shielding layer 1, outer insulation layer 4, and sheath. It should be noted that during the process of establishing the three-dimensional geometric solid model, material properties and element types as shown in Table 1 are assigned to each component to give it physical characteristics.
[0025] Table 1
[0026] When establishing the three-dimensional geometric solid model, shell elements are used to discretize the layered structures such as the core, insulation layers (inner and outer insulation layers), and sheath to calculate their mechanical behavior under bending and to handle the electromagnetic field solution. For the shielding layer, its braided monofilaments are discretized into beam elements. This element type can accurately simulate the response of the monofilaments under the combined effects of bending and torsion, and combined with the friction coefficient μ, it provides a mechanical basis for subsequent calculations of contact slip between the braided monofilaments, thus achieving accurate prediction of microscopic deformation.
[0027] Step S120: Perform bending-deformation coupling modeling based on the three-dimensional geometric solid model to calculate the deformation parameters; wherein, the deformation parameters characterize the micro-geometric changes of the shielding layer. Among them, the bending-deformation coupled modeling is a physical simulation process used to calculate the microscopic mechanical deformation of the internal structure of a cable after it is installed in a three-dimensional geometric shape, under the action of gravity, assembly stress, etc.
[0028] The deformation parameters can include the change in the local braiding angle and the change in the local mesh opening area of the shielding layer. The change in the local braiding angle is the difference in the angle between the single filament in the braided shielding layer and the cable axis before and after deformation, which is used to characterize the degree of geometric distortion of the braided structure caused by bending; the change in the local mesh opening area is the difference in the area of the braided mesh of the shielding layer before and after deformation, which is used to reflect the change in the electromagnetic leakage path.
[0029] Step S130: Evaluate the shielding effectiveness of the cable based on the deformation parameters; For example, based on the calculated deformation parameters, the actual electromagnetic shielding effect of the cable is calculated, and it is determined in which frequency bands or locations its shielding capability will decrease.
[0030] Step S140: Compare the shielding effectiveness with a preset threshold, and determine the unqualified points of shielding effectiveness based on the comparison results; For example, the shielding effectiveness value obtained from simulation calculation is compared with the preset threshold specified in the design standard to find the specific location where the shielding effect is not up to standard.
[0031] For example, when simulating a shielded cable with a radius of curvature of 315mm and a bending angle of 77°, the simulation results of the curve at the point of minimum shielding attenuation are as follows: Figure 4 As shown in the figure, purple represents the simulation results. It can be seen that within the frequency band of 30MHz-100MHz, the shielding attenuation is lower than the enterprise standard limit, which is unqualified.
[0032] Step S150: Optimize the points where the shielding effectiveness is unqualified.
[0033] For points where shielding effectiveness is substandard, the radius of curvature can be increased to 400mm while keeping the bending angle unchanged. Then, the aforementioned simulation steps can be repeated to obtain the simulation results of the curve at the point of minimum shielding attenuation after optimization, as shown below. Figure 5 As shown in the figure, the blue area represents the simulation results, which show that all frequency points are above the limit and meet the enterprise standard requirements.
[0034] This application establishes a three-dimensional geometric solid model and a bending-deformation coupled model to determine the microstructural changes of the shielding layer caused by deformation. Then, based on electromagnetic simulation, it achieves shielding effectiveness evaluation and optimizes areas where shielding effectiveness is substandard. This effectively analyzes the shielding effectiveness attenuation problem caused by mechanical deformation in practical applications, improving evaluation accuracy and optimization efficiency.
[0035] Please see Figure 6 , Figure 6 This is a flowchart illustrating a method for obtaining deformation parameters according to an embodiment of this application. Figure 6 In this process, bending-deformation coupling modeling is performed based on a 3D geometric solid model to calculate deformation parameters, including: Step S610: Calculate the curvature and twist of the cable based on the center trajectory of the three-dimensional geometric solid model; Curvature is a quantitative indicator of the degree of cable bending, used to analyze the stress distribution of the cable under bending conditions; twist is a quantitative indicator of the degree of cable torsion, used to analyze the stress distribution of the cable under torsion conditions. Curvature and twist can be calculated in the following ways and then used as input parameters for subsequent simulations.
[0036] Specifically, along the central trajectory path, discrete sampling is performed at intervals no greater than one-twentieth of the minimum wavelength (Δl≤λ_min / 20), and the curvature κ(s) and twist τ(s) of each sampling point are calculated using the following formulas:
[0037] Where r(s) is the spatial vector along the central trajectory (x, y, z vary with arc length s); r′(s) is the first derivative of r(s), representing the tangent vector; r″(s) is the second derivative of r(s), representing the curvature vector; r (s) is the third derivative of r(s), representing the rate of change of curvature.
[0038] Step S620: Establish a coupled finite element model containing shell elements and beam elements; The methods for establishing coupled finite element models include: Step 1: Model the cable core, insulation layer, and sheath as shell elements; the shell elements are used to simulate the overall load-bearing capacity and deformation during bending. Specifically, Mindlin-Reissner shell elements are used, and 5-7 integration points are set in the thickness direction.
[0039] Step 2: Discretize the braided monofilaments of the shielding layer into Timoshenko beam elements; the beam elements are used to simulate the bending, shearing and torsional deformation of the monofilaments under stress. Specifically, each monofilament is divided into equal parts at 2mm intervals along its length, with a circular cross-section (diameter d_braid), and numerical calculations are performed using a 4-point Gaussian integral along the cross-section.
[0040] Step 3: Define contact and friction properties between beam elements and between beam elements and shell elements to construct a coupled finite element model based on the contact and friction properties.
[0041] Specifically, the friction properties are defined using the Coulomb friction model, with the tangential frictional stress τ_contact=μ·σ_n, where the friction coefficient μ is calibrated through independent torsion-slip experiments and has a value range of 0.15-0.35, and σ_n represents the stress in the direction perpendicular to the contact surface, i.e., n represents normal, which means the compressive stress perpendicular to the contact surface.
[0042] Specifically, contact attributes are defined in the following manner: For both shell and beam elements, a linear elastic constitutive relation is adopted, and their stress-strain relationship σ satisfies σ=E·ε; σ represents the material normal stress; E represents Young's modulus; ε represents strain; The strain ε of the shell element is determined by the curvature κ(s), the torsion τ(s), and the shell thickness direction coordinate z, ε=κ(s)·z+τ(s)·r; r is the beam cross-section radius, and s represents the arc length.
[0043] It should be noted that the bending constitutive relation of shell elements, that is, the bending behavior of shell elements, is described by the following relation: M=E·I_shell·κ_bend Where M represents the bending moment, κ_bend is the bending curvature of the shell element, I_shell is the moment of inertia of the shell element section, and E represents Young's modulus. It should be noted that the torsional constitutive relation of the beam element, that is, the torsional behavior of the beam element, is described by the following relation: T=G·J_beam·τ_twist Where T represents torque, τ_twist is the torsion of the beam element, J_beam is the torsional constant of the beam element section, G=E / (2(1+ν)) is the material shear modulus, G represents shear modulus, and ν represents Poisson's ratio.
[0044] By performing steps 1 to 3 above, a coupled finite element model that can reflect the contact and friction properties between beam elements and between beam elements and shell elements is finally established.
[0045] Step S630: Simulate the deformation structure of the cable under bending state based on curvature, torsion and coupled finite element model to obtain finite element simulation results; The calculated curvature κ(s) is used as the input for the bending load of the shell element, and the torsion τ(s) is used as the input for the torsional load of the beam element. The coupled finite element model is solved by calling the existing finite element solver. The solution methods include explicit dynamic solution and implicit static solution.
[0046] (1) For transient analysis performed using an explicit dynamics solver; Key parameter settings: The time step Δt is determined according to the CFL condition (convergence condition judgment number): Δt=CFL·h_min / c, where h_min represents the minimum side length of the network, c represents the elastic wave velocity of the material, and the CFL value is 0.9; The total simulation time was set to 0.5 seconds, and the simulation process included the loading of gravity load, thermal load, and assembly displacement. (2) For static analysis performed using an implicit static solver; The solution is obtained using the Newton-Raphson iterative method, with a convergence tolerance of 1 × 10⁻⁶. -6 When there are large displacements and rotations, the arc length method is used to track the load-displacement path of the structure.
[0047] The finite element simulation results obtained through the above solution process provide a data foundation for subsequent extraction of deformation parameters. The finite element simulation results include: geometric structural parameters of the cable after deformation (coordinate position and cross-sectional direction of each node in the beam element), tangential frictional stress τ_contact, stress σ_n, material normal stress σ, strain ε, bending moment M, and torque T, etc.
[0048] Step S640: Calculate the deformation parameters based on the finite element simulation results.
[0049] The braiding angle distribution β_FE(s) and the mesh opening area distribution A_FE(s) of the shielding layer are calculated based on the deformed geometric parameters in the finite element simulation results. β_FE(s) is the angle between the cross-sectional direction of the beam element and the direction of the braided structure. For the braided angle distribution β_FE(s), β_FE(s) = arctan(dy / ds), where dy is the component change of the cross-sectional direction on the y-axis and ds is the differential along the length of the beam element.
[0050] The mesh opening area distribution A_FE(s) of the shielding layer is determined based on the coordinate position of the nodes and the spacing P between the beam elements, and calculated using the formula A_FE(s)≈(P×P) / sin(β_FE(s)).
[0051] Calculate the local braiding angle change Δβ(s) and the mesh opening area distribution A_FE(s) of the shielding layer according to formulas (1) and (2): Δβ(s)=β0-β_FE(s)(1) Wherein, β0 is the nominal braiding angle in the straight section of the cable; ΔA(s)=A_FE(s)-A0(2) Where A0 is the nominal shielding mesh opening area in the straight section of the cable.
[0052] The calculated local weaving angle change Δβ(s) and local mesh opening area change ΔA(s) are combined to obtain the deformation parameter D(s)={Δβ(s),ΔA(s)}, which is used to characterize the microscopic geometric change state of the shielding layer.
[0053] This application quantifies the bending state of cables by measuring curvature and torsion, and accurately simulates the deformation response of cables under bending conditions by combining a coupled finite element model. This can accurately capture the micro-geometric changes of the shielding layer braid structure, providing key input parameters for accurate evaluation of shielding effectiveness, thereby improving the reliability of cable shielding design.
[0054] Please see Figure 7 , Figure 7 This is a flowchart illustrating a shielding effectiveness evaluation method according to one embodiment of the application. Figure 7 The finite element simulation results include a coupled finite element model undergoing deformation, and the shielding effectiveness of the cable is evaluated based on the deformation parameters, including: Step S710: Mesh the deformed coupled finite element model to obtain the electromagnetic simulation mesh; Mesh generation refers to the process of discretizing a continuously coupled finite element model into a finite number of elements, which can be achieved using tetrahedral and / or hexahedral elements.
[0055] Specifically, based on the finite element model after bending-deformation coupling modeling, the deformed geometric entities are extracted as the geometric basis for electromagnetic mesh generation; a conformal hexahedron and tetrahedron hybrid mesh generation method is adopted to automatically generate the electromagnetic simulation mesh on the deformed geometric entities; the generated electromagnetic simulation mesh is output in a standard format, and the supported formats for generating the electromagnetic simulation mesh include .msh, .cdb or *.inp.
[0056] It should be noted that when the curvature κ > 0.05 mm - ¹For areas with a local twist angle greater than 30°, automatic mesh refinement is applied, and the cell size in this area is no greater than 1 / 2 of the global basic cell size.
[0057] Step S720: Determine the equivalent electromagnetic parameters based on the deformation parameters; The equivalent electromagnetic parameter is a parameter that reflects the electromagnetic properties of the material after deformation. The equivalent electromagnetic parameter is the equivalent surface impedance that varies with frequency f and position s.
[0058] The value of the equivalent surface impedance Zs(f,s) is determined based on the deformation parameter through a pre-calibrated mapping relationship.
[0059]
[0060] Where k1 and k2 are empirical coefficients calibrated in one step using the coaxial tube method; the empirical coefficients take values of k2 = 0.35 mΩ / (mm²·MHz); The nominal surface impedance Zs0(f) of the straight segment is calculated based on the conductivity σ_braid of the shielding material and the braid coverage, or it can be directly provided by the measured S2P parameter file.
[0061] After calculating the equivalent electromagnetic parameters, the calculated equivalent surface impedance Zs(f,s) is assigned to the shielding element at the corresponding position in the electromagnetic simulation mesh to complete the parameter update of the electromagnetic simulation mesh.
[0062] Step S730: Solve the electromagnetic field using the electromagnetic simulation mesh and equivalent electromagnetic parameters to obtain the shielding effectiveness of the cable.
[0063] The methods for solving electromagnetic fields include: Step 1, Model Loading and Solver Configuration: Using an electromagnetic simulation mesh as the computational object, the finite element method was selected as the electromagnetic solver, and a hybrid of second-order tetrahedral and hexahedral elements was employed to discretize the electromagnetic simulation mesh. The electromagnetic solver can utilize either MUMPS (Massachusetts University Parallel Sparse Matrix) or AMG (Algebraic Multigrid) algebraic multigrid solvers to improve computational efficiency.
[0064] Step 2, Excitation Port and Boundary Condition Settings: The equivalent electromagnetic parameters are mapped to the corresponding elements of the electromagnetic simulation mesh to complete the physical definition of the simulation model. Settings are configured at the corresponding port locations of the electromagnetic simulation mesh: at port 1, a coaxial TEM mode (Transverse Electromagnetic Mode, TEM) excitation is set, with a characteristic impedance defined as 50Ω; at port 2, a virtual sphere with a radius of 1 meter is set as the far-field radiation boundary, and the field is expanded using spherical wave basis functions; a perfectly matched layer is set at the outer boundary to ensure the reflection coefficient is below -40dB. Step 3, Frequency Sweep Analysis: The frequency range is set to 30MHz to 330MHz, with a step size of 10MHz. The solver performs discrete frequency point scanning calculations within this range to obtain the electromagnetic field distribution results at each frequency point. During the frequency sweep, the main electromagnetically sensitive frequency bands of automotive electronics are covered. Step 4, Output the results: After the solution is completed, the minimum shielding effectiveness and corresponding frequency points in the entire frequency band are output. The data is stored in CSV (Comma-Separated Values) format and includes the "Freq,SE_dB" field. The three-dimensional magnetic field distribution data H(x,y,z,f) is output and stored in HDF5 (Hierarchical Data Format) format with a voxel resolution of 2mm×2mm×2mm.
[0065] This application achieves accurate characterization of electromagnetic properties under deformation by dynamically mapping deformation parameters to equivalent electromagnetic parameters, thus solving the simulation error problem caused by neglecting geometric deformation.
[0066] In one embodiment, optimizing the shielding effectiveness deficiencies includes at least one of the following: Adjust the radius of curvature; adjust the bending angle; add local shielding sleeves; rewire.
[0067] Increase the radius of curvature of the cable at the point where the shielding effectiveness is substandard; Adjust the bending angle of the cable at the point where the shielding effectiveness is substandard; Re-plan the cabling path.
[0068] The following explanation uses the adjustment of the radius of curvature as an example.
[0069] For example, when simulating a shielded cable with a radius of curvature of 315mm and a bending angle of 77°, the simulation results of the curve at the minimum shielding attenuation are as follows: Figure 4 As shown in the image, the purple area represents the simulation results. It can be seen that within the frequency band of 30MHz-100MHz, the shielding attenuation is lower than the enterprise standard limit, which is unacceptable. By increasing the radius of curvature to 400mm while keeping the bending angle unchanged, the simulation was repeated, and the simulation result at the minimum shielding attenuation after optimization was obtained, as shown in the image. Figure 5 As shown in the figure, the blue area represents the simulation results, which show that all frequency points are above the limit and meet the requirements.
[0070] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.
[0071] Please see Figure 8 , Figure 8This is a schematic diagram of a shielded cable shielding effectiveness optimization device according to an embodiment of this application. Figure 8 The shielding effectiveness optimization device for shielded cables includes: Model building module 810 is used to acquire cable parameters and build a three-dimensional geometric solid model of the high-voltage shielded cable based on the cable parameters; The deformation parameter calculation module 820 is used to perform bending-deformation coupling modeling based on the three-dimensional geometric solid model and calculate the deformation parameters; among which, the deformation parameters characterize the micro-geometric changes of the shielding layer; The shielding effectiveness evaluation module 830 is used to evaluate the shielding effectiveness of cables based on deformation parameters. The non-conforming point location module 840 is used to compare the shielding effectiveness with a preset threshold and determine the non-conforming points of the shielding effectiveness based on the comparison result. The shielding effectiveness optimization module 850 is used to optimize the shielding effectiveness of substandard points.
[0072] It should be noted that the shielding effectiveness optimization device for shielded cables provided in the above embodiments and the shielding effectiveness optimization method for shielded cables provided in the above embodiments belong to the same concept. The specific operation methods of each module and unit have been described in detail in the method embodiments and will not be repeated here. In practical applications, the shielding effectiveness optimization device for shielded cables provided in the above embodiments can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. This is not a limitation here.
[0073] Embodiments of this application also provide a shielded cable shielding performance optimization device, including: one or more processors; and a memory for storing one or more programs, which, when executed by one or more processors, cause the memory to implement the shielded cable shielding performance optimization method in the above embodiments.
[0074] Embodiments of this application also provide one or more machine-readable media having instructions stored thereon that, when executed by one or more processors, cause the processors to perform the shielded cable shielding effectiveness optimization method described in the above embodiments.
[0075] Figure 9 A schematic diagram of a computer system suitable for implementing the memory of embodiments of this application is shown. It should be noted that... Figure 9 The computer system with the memory shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.
[0076] like Figure 9As shown, the computer system 900 includes a Central Processing Unit (CPU) 901, which can perform various appropriate actions and processes, such as executing the methods described in the above embodiments, based on a program stored in Read-Only Memory (ROM) 902 or a program loaded from storage into Random Access Memory (RAM) 903. The RAM also stores various programs and data required for system operation. The CPU 901, ROM 902, and RAM 903 are interconnected via a bus 904. An input / output (I / O) interface 905 is also connected to the bus 904.
[0077] The following components are connected to I / O interface 905: an input section 906 including a keyboard, mouse, etc.; an output section 907 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 908 including a hard disk, etc.; and a communication section 909 including a network interface card such as a LAN (Local Area Network) card, modem, etc. The communication section 909 performs communication processing via a network such as the Internet. A drive 910 is also connected to I / O interface 905 as needed. Removable media 911, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., are installed on drive 910 as needed so that computer programs read from them can be installed into storage section 908 as needed.
[0078] Specifically, according to embodiments of this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program including a computer program for performing the shielded cable shielding effectiveness optimization method of the aforementioned embodiments. In such embodiments, the computer program can be downloaded and installed from a network via a communication component, and / or installed from a removable medium 911. When the computer program is executed by a central processing unit (CPU) 901, it performs various functions defined in the system of this application.
[0079] It should be noted that the computer-readable medium shown in the embodiments of this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM) 903, read-only memory (ROM) 902, erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable compact disc read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this application, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, carrying a computer-readable computer program. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media can also be any computer-readable medium other than computer-readable storage media, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The computer program contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, etc., or any suitable combination thereof.
[0080] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. Each block in a flowchart or block diagram may represent a module, program segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, or they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block or combination of blocks in a block diagram or flowchart may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.
[0081] The units described in the embodiments of this application can be implemented in software or hardware, and the described units can also be located in a processor. The names of these units do not necessarily limit the specific unit itself.
[0082] Another aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a computer's processor, causes the computer to perform the shielded cable shielding effectiveness optimization method as described above. This computer-readable storage medium may be included in the memory described in the above embodiments, or it may exist independently and not incorporated into that memory.
[0083] Another aspect of this application provides a computer program product or computer program including computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the shielded cable shielding effectiveness optimization method provided in the various embodiments described above.
[0084] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.
Claims
1. A method for optimizing the shielding effectiveness of shielded cables, characterized in that, include: Obtain cable parameters and establish a three-dimensional geometric solid model of the high-voltage shielded cable based on the cable parameters; Based on the aforementioned three-dimensional geometric solid model, bending-deformation coupling modeling is performed to calculate deformation parameters; wherein, the deformation parameters characterize the microscopic geometric changes of the shielding layer; The shielding effectiveness of the cable is evaluated based on the aforementioned deformation parameters; The shielding effectiveness is compared with a preset threshold, and the shielding effectiveness failure points are determined based on the comparison results; The defects in shielding effectiveness are optimized.
2. The method for optimizing the shielding effectiveness of shielded cables according to claim 1, characterized in that, The bending-deformation coupling modeling based on the three-dimensional geometric solid model, and the calculation of deformation parameters, include: Calculate the curvature and torsion of the cable based on the center trajectory of the three-dimensional geometric solid model; Establish a coupled finite element model that includes shell elements and beam elements; Based on the curvature, the torsion, and the coupled finite element model, the deformation structure of the cable under bending conditions is simulated, and the finite element simulation results are obtained. The deformation parameters are calculated based on the finite element simulation results.
3. The method for optimizing the shielding effectiveness of shielded cables according to claim 1, characterized in that, The finite element simulation results include a coupled finite element model that has undergone deformation. The evaluation of the cable's shielding effectiveness based on the deformation parameters includes: The electromagnetic simulation mesh is obtained by meshing the deformed coupled finite element model. Based on the deformation parameters, the equivalent electromagnetic parameters are determined; The electromagnetic field is solved using the electromagnetic simulation mesh and the equivalent electromagnetic parameters to obtain the shielding effectiveness of the cable.
4. The method for optimizing the shielding effectiveness of shielded cables according to claim 3, characterized in that, The equivalent electromagnetic parameter is the equivalent surface impedance that varies with frequency and position, and the value of the equivalent surface impedance is determined based on the deformation parameter through a pre-calibrated mapping relationship.
5. The method for optimizing the shielding effectiveness of shielded cables according to claim 1, characterized in that, The deformation parameters include: The local variation in the braiding angle of the shielding layer; The change in the local mesh opening area of the shielding layer.
6. The method for optimizing the shielding effectiveness of shielded cables according to claim 2, characterized in that, The establishment of a coupled finite element model including shell elements and beam elements includes: The cable core, insulation layer, and sheath are modeled as shell units; Discretize the braided monofilaments of the shielding layer into beam elements; Contact and friction properties are defined between the beam elements and between the beam elements and the shell elements to construct a coupled finite element model based on the contact and friction properties.
7. The method for optimizing the shielding effectiveness of shielded cables according to claim 1, characterized in that, The optimization of the shielding effectiveness defects includes at least one of the following: Increase the radius of curvature of the cable at the point where the shielding effectiveness is substandard; Adjust the bending angle of the cable at the point where the shielding effectiveness is substandard; Re-plan the cabling path.
8. A device for optimizing the shielding effectiveness of shielded cables, characterized in that, include: The model building module is used to acquire cable parameters and build a three-dimensional geometric solid model of the high-voltage shielded cable based on the cable parameters. The deformation parameter calculation module is used to perform bending-deformation coupling modeling based on the three-dimensional geometric solid model and calculate the deformation parameters; wherein, the deformation parameters characterize the micro-geometric changes of the shielding layer; The shielding effectiveness evaluation module is used to evaluate the shielding effectiveness of the cable based on the deformation parameters. The defect point location module is used to compare the shielding effectiveness with a preset threshold and determine the defect points of the shielding effectiveness based on the comparison result; The shielding effectiveness optimization module is used to optimize the unqualified points of the shielding effectiveness.
9. A device for optimizing the shielding effectiveness of shielded cables, characterized in that, include: One or more processors; A storage device for storing one or more programs, which, when executed by one or more processors, cause the shielded cable shielding effectiveness optimization device to implement the shielded cable shielding effectiveness optimization method as described in any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that, It stores a computer program, which, when executed by the computer's processor, causes the computer to perform the shielding effectiveness optimization method for shielded cables as described in any one of claims 1 to 7.