Modeling device for braided shielded wires, modeling method for braided shielded wires, and modeling program for braided shielded wires

Abstract

The objective is to provide a modeling device for braided shielded cables, a modeling method for braided shielded cables, and a modeling program for braided shielded cables that can appropriately reduce the time required for modeling braided shielded cables. [Solution] The simulation device 1, which is a modeling device for the braided shielded wire 100, includes a model creation unit 41 that creates a braided shielded wire model M1 that reproduces the current flowing through the braided shield 130 of the braided shielded wire 100. The braided shielded wire model M1 includes a core wire model m1 corresponding to the core wire 110, an insulator model m2 corresponding to the insulator 120, and a braided shield model m3 corresponding to the braided shield 130. The braided shield model m3 includes a plurality of strand strip models m30 that model the strand bundle 136 in a strip shape, and the plurality of strand strip models m30 are spaced apart from each other.

Description

[Technical Field]

[0001] The present invention relates to a modeling apparatus for braided shielded wires, a modeling method for braided shielded wires, and a modeling program for braided shielded wires. [Background technology]

[0002] As a technology relating to conventional braided shielded wire modeling devices, for example, Patent Document 1 discloses a braided shielded wire modeling device equipped with a model creation unit for creating a braided shielded wire model. The model creation unit includes a first layer in which a plurality of first strand bundle models are formed spirally along a first direction about the axis of the core wire model, and a second layer provided outside the first layer, spaced apart from the first layer, in which a plurality of second strand bundle models are formed spirally along a second direction opposite to the first direction about the axis of the core wire model, and creates a braided shielded wire model in which the first strand bundle models of the first layer and the second strand bundle models of the second layer are not braided together. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-144343 [Overview of the project] [Problems that the invention aims to solve]

[0004] By the way, modeling devices for braided shielded cables like this can be time-consuming, for example, when creating models for a large number of individual wires, and there is room for further improvement in modeling braided shielded cables.

[0005] The present invention has been made in view of the above circumstances, and aims to provide a modeling device for braided shielded wires, a modeling method for braided shielded wires, and a modeling program for braided shielded wires that can properly shorten the time required for modeling braided shielded wires. [Means for solving the problem]

[0006] To achieve the above objective, the braided shield wire modeling apparatus of the present invention includes a model creation unit that creates a braided shield wire model that reproduces the current flowing through the braided shield of a braided shield wire comprising a conductive core wire, an insulator covering the core wire, and a braided shield provided around the insulator with a plurality of strand bundles formed by bundling a plurality of strands. The braided shield wire model includes a core wire model corresponding to the core wire, an insulator model corresponding to the insulator, and a braided shield model corresponding to the braided shield. The braided shield model includes a plurality of strand strip models that model the strand bundles in a strip shape, and the plurality of strand strip models are spaced apart from each other.

[0007] To achieve the above objective, the present invention provides a model creation step for creating a model of a braided shielded wire that reproduces the current flowing through the braided shield of a braided shielded wire comprising a conductive core wire, an insulator covering the core wire, and a braided shield provided around the insulator with a plurality of strand bundles formed by bundling a plurality of strands. In this step, the model creation step includes creating a model of the braided shielded wire that includes a core wire model corresponding to the core wire, an insulator model corresponding to the insulator, and a braided shield model corresponding to the braided shield. In this step, the braided shield model includes a plurality of strand strip models that model the strand bundles in a strip shape, and the plurality of strand strip models are spaced apart from each other.

[0008] To achieve the above objective, the braided shield wire modeling program of the present invention is a program that causes a computer to execute a model creation step to create a braided shield wire model that reproduces the current flowing through the braided shield of a braided shield wire comprising a conductive core wire, an insulator covering the core wire, and a braided shield model that includes a core wire model corresponding to the core wire, an insulator model corresponding to the insulator, and a braided shield model corresponding to the braided shield, wherein the model creation step includes a plurality of wire strip models that model the wire strips in a strip shape, and the plurality of wire strip models are spaced apart from each other. [Effects of the Invention]

[0009] The braided shield wire modeling apparatus, braided shield wire modeling method, and braided shield wire modeling program according to the present invention have the effect of properly reducing the time required for modeling braided shield wires. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a block diagram showing an example configuration of a simulation device for braided shielded wires according to an embodiment. [Figure 2] Figure 2 is a perspective view showing an example of the configuration of a modeled braided shielded cable. [Figure 3] Figure 3 is a perspective view showing an example of a braided shielded wire model configuration according to an embodiment. [Figure 4] Figure 4 is a cross-sectional view taken along line IV-IV of Figure 3. [Figure 5] Figure 5 shows the length of one circumference of the strands around the axis in the core wire of the braided shielded wire according to the embodiment. [Figure 6] Figure 6 is an explanatory diagram for explaining the calculation of the strip cross-section. [Figure 7]FIG. 7 is an explanatory diagram for explaining the calculation of the strip cross-section, and is a diagram schematically showing a cross-section corresponding to the IV-IV cross-section of FIG. 3. [Figure 8] FIG. 8 is a diagram comparing the transfer impedance of the braided shield in the braided shielded wire model according to the present embodiment in which the strand bundle is modeled in a带状 shape, and the transfer impedance of the braided shield in the braided shielded wire model according to the comparative example, which has a strand bundle model in which each strand is modeled. [Figure 9] FIG. 9 is a cross-sectional view corresponding to the IV-IV cross-section of FIG. 3 when the first strand band model and the second strand band model according to the embodiment are woven, according to a modification of the embodiment. [Figure 10] FIG. 10 is a schematic cross-sectional view showing that the lengths from the center to the first strand band model and the second strand band model change periodically, according to a modification of the embodiment. [Figure 11] FIG. 11 is a flowchart showing the processing procedure of the simulation method of the braided shielded wire according to the embodiment. [Figure 12] FIG. 12 is a diagram comparing the transfer impedances in each braided shielded wire model and the braided shielded wire. [Mode for Carrying Out the Invention]

[0011] Hereinafter, embodiments of the present invention will be described in detail based on the drawings. Note that the present invention is not limited by this embodiment. In addition, the components in the following embodiments include those that can be replaced by those skilled in the art and are easy, or those that are substantially the same.

[0012] [Embodiment] It should be noted that the word "带状" in the original text seems to be a misspelling. It is guessed that it should be "带状 (band-shaped)". If this is not what you want, please provide more context or clarify the question.The simulation device 1 for a braided shielded wire according to an embodiment will be described with reference to the drawings. The simulation device 1 for a braided shielded wire 100 (see Figure 2) is an example of a modeling device for a braided shielded wire 100. It creates a braided shielded wire model M (see Figure 3) that reproduces the current flowing through the braided shield 130 (see Figure 2) of the braided shielded wire 100, and analyzes the shielding characteristics of the braided shielded wire 100 by performing a three-dimensional electromagnetic field simulation based on the braided shielded wire model M. In this embodiment, the simulation device 1 for a braided shielded wire 100 has pre-stored mathematical formulas for creating the braided shielded wire model M, which will be described later, and the braided shielded wire model M is created by setting parameters in the variables of these formulas. The simulation device 1 for a braided shielded wire 100 can be implemented using various computer equipment such as a personal computer, workstation, or tablet terminal.

[0013] Here, as shown in Figure 2, the braided shielded wire 100 to be simulated is, for example, a component of a wire harness mounted on a vehicle, and is applied to communication cables and high-voltage cables. The braided shielded wire 100 is composed of a conductive core wire 110, an insulator 120 covering the core wire 110, and a braided shield 130 provided around the insulator 120. The braided shield 130 has multiple strand bundles 136 formed by bundling multiple strands 135 together, and is formed by braiding the multiple strand bundles 136 together to shield against noise. Here, as shown in Figures 2 and 3, in the braided shielded wire 100 and the braided shielded wire model M, the direction along the axis CL of the core wire 110 (core wire model m1) is defined as the Z direction, and the two directions perpendicular to the Z direction are defined as the Y direction and the X direction, respectively. Also, the positive side and negative side of the X, Y, and Z directions are defined as one side and the other side, respectively. Furthermore, when viewed from the other side in the Z direction, the counterclockwise direction around the axis CL of the core wire 110 is defined as the first direction CW1, and the clockwise direction around the axis CL opposite to the first direction CW1 is defined as the second direction CW2.

[0014] In the example shown in Figure 2, the multiple strand bundles 136 of the braided shield 130 include multiple first strand bundles 131 arranged spirally along a first direction CW1 around the axis CL of the core wire 110, and multiple second strand bundles 132 arranged spirally along a second direction CW2 and braided with each first strand bundle 131. The braided shield 130 has, for example, a diameter of about 0.1 mm for each strand 135, and in the case of high-voltage cables, the number of strands 135 may exceed 1000, and is modeled in three dimensions (X coordinate, Y coordinate, Z coordinate) by the simulation device 1 for the braided shielded wire 100. The simulation device 1 for the braided shielded wire 100 will be described in detail below.

[0015] As shown in Figure 1, the braided shielded wire simulation device 1 comprises an input device 10 as an input unit, an output device 20, a memory circuit 30, and a processing circuit 40. The input device 10, output device 20, memory circuit 30, and processing circuit 40 are connected to each other via a network so that they can communicate with one another.

[0016] The input device 10 is a device capable of inputting information to the simulation device 1 of the braided shielded wire 100. The input device 10 is composed of, for example, an operation input device 11 and a data input device 12, which are devices that perform various inputs to the simulation device 1 of the braided shielded wire. The operation input device 11 is a device that receives various operation inputs (information inputs) from the user. The operation input device 11 can be implemented by, for example, a mouse, keyboard, trackball, switch, button, joystick, touchpad, touchscreen, non-contact input circuit, voice input circuit, etc. The data input device 12 is a device that receives various data inputs (information inputs) from other devices outside the simulation device 1 of the braided shielded wire 100. The data input device 12 is implemented by, for example, a communication interface that transmits and receives various types of data to and from the device via communication, whether wired or wireless, and a recording medium interface that reads various types of data from recording media such as hard disk drives (HDDs), solid state drives (SSDs), flexible disks (FDs), magneto-optical disks, CD-ROMs, DVDs, USB memory, SD card memory, and flash memory.

[0017] The output device 20 is a device capable of outputting information from the simulation device 1 of the braided shielded wire 100. The output device 20 is configured to include, for example, a display device 21 and a data output device 22, as a device that outputs various things from the simulation device 1 of the braided shielded wire 100. The display device 21 is a device that outputs and displays various kinds of image information. The display device 21 is implemented by, for example, an image display device such as a liquid crystal display, plasma display, or organic EL display. The data output device 22 is a device that outputs data (outputs information) to other devices outside the simulation device 1 of the braided shielded wire 100. The data output device 22 is implemented by, for example, a communication interface that sends and receives various kinds of data to and from devices via communication, whether wired or wireless, or a recording medium interface that writes various kinds of data to a recording medium similar to the above. Note that the data input device 12 and the data output device 22 described above may share some or all of their configurations.

[0018] The memory circuit 30 is a circuit that stores various types of data (information). The memory circuit 30 can be implemented using, for example, a semiconductor memory element such as RAM (Random Access Memory) or flash memory, a hard disk, or an optical disk. The memory circuit 30 stores, for example, programs for the simulation device 1 of the braided shielded wire 100 to implement various functions. The programs stored in the memory circuit 30 include programs that activate the input device 10, programs that activate the output device 20, and programs that activate the processing circuit 40 (for example, a simulation program including the modeling program for the braided shielded wire 100 described later). The memory circuit 30 also stores various types of data, such as data input via the input device 10, data necessary for various processes in the processing circuit 40, and data output via the output device 20. The memory circuit 30 reads out these various types of data as needed by the processing circuit 40, etc. Note that the memory circuit 30 may be implemented using a cloud server or the like connected to the simulation device 1 of the braided shielded wire 100 via a network.

[0019] The processing circuit 40 is a circuit that implements various processing functions in the simulation device 1 for the braided shielded wire 100. The processing circuit 40 is implemented by, for example, a processor. A processor refers to circuits such as a CPU (Central Processing Unit), MPU (Micro Processing Unit), ASIC (Application Specific Integrated Circuit), or FPGA (Field Programmable Gate Array). The processing circuit 40 implements each processing function by, for example, executing a program read from the memory circuit 30.

[0020] The above describes the general configuration of the simulation device 1 for the braided shielded wire 100 according to this embodiment. With this configuration, the processing circuit 40 according to this embodiment creates a braided shielded wire model M that reproduces the current flowing through the braided shield 130 of the braided shielded wire 100, as shown in Figures 3 to 5 and 9, and analyzes the shielding characteristics of the braided shielded wire 100 by performing a three-dimensional electromagnetic field simulation based on the braided shielded wire model M. As shown in Figure 1, the processing circuit 40 is composed of a model creation unit 41 and an analysis processing unit 42.

[0021] The model creation unit 41 creates a braided shielded wire model M that reproduces the current flowing through the braided shield 130 of the braided shielded wire 100.

[0022] The model creation unit 41 creates a braided shielded wire model M, for example, as shown in Figures 3 and 4, which includes a core wire model m1 corresponding to the core wire 110, an insulator model m2 corresponding to the insulator 120, and a braided shield model m3 corresponding to the braided shield 130. In Figure 4, the center C is defined as the center point of the core wire model m1 (braided shield model m3) on axis CL. The braided shield model m3 includes a plurality of strand strip models m30, each modeling a plurality of strand bundles 136 in a strip shape. Each strand strip model m30 is spaced apart from each other in the radial direction of the braided shielded wire model M. In this embodiment, the braided shield model m3 of the braided shielded wire model M1 includes a first strand strip model m31 and a second strand strip model m32, each modeling a first strand bundle 131 and a second strand bundle 132 as strand strip models m30, respectively. In the braided shielded wire model M1, the first strand band model m31 and the second strand band model m32 of the braided shield model m3 are modeled as not being braided together. Furthermore, the second strand band model m32 is positioned outside the first strand band model m31. The first strand band model m31 and the second strand band model m32 are separated from each other in the radial direction of the braided shielded wire model M1.

[0023] The model creation unit 41 creates the braided shielded wire model M1 described above by sweeping the cross-sectional shape of the wire strip model m30 by setting parameters for the variables in the following equations (1) to (8). Equations (1) to (8) are stored in the memory circuit 30 in advance. The parameters to be set for the variables in equations (1) to (8) are input via the input device 10. As shown in Figures 3 to 5, the model creation unit 41 sets the coordinates in the three-dimensional coordinate system to be x, y, and z, the diameter of the wire 135 to be r, the diameter of the insulator 120 to be R, the length of the wire around the axis CL of the wire 135 to be p, the total number of bundles (number of strands) of the first wire bundle 131 and the second wire bundle 132 to be n, and the radial gap between wire strip models m30 (the radial gap between the first wire strip model m31 and the second wire strip model m32) to be g. hAssuming that a predetermined value on the 3D coordinate system is t, and that the distance from the center C of the core wire model m1 to the second strand band model m32 is r1, and the distance from the center C of the core wire model m1 to the first strand band model m31 is r2, a braided shielded wire model M1 that satisfies the following equations (1) to (8) is created. That is, the braided shielded wire model M1 created by the model creation unit 41 satisfies the following equations (1) to (8). Equations (1) to (4) represent a configuration in which multiple first strand band models m31 are formed spirally along the first direction CW1 around the axis CL of the core wire model m1, and equations (5) to (8) represent a configuration in which multiple second strand band models m32 are formed spirally along the second direction CW2, which is in the opposite direction to the first direction CW1 around the axis CL of the core wire model m1. Figure 4 shows the diameter r of the wire strand 135 and the diameter R of the insulator 120 applied to the braided shielded wire model M1.

[0024]

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[0025]

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[0026] When modeling the wire bundle 136 in a strip shape, the model creation unit 41 calculates the cross-sectional shape of the wire bundle 136 when it is in a strip shape (the shape of the cross-section on a plane perpendicular to the axis CL of the wire strip model m30, hereinafter referred to as the "strip cross-section"), and this strip cross-section is swept using the coordinates x, y, and z on the three-dimensional coordinate system represented by equations (1) to (8). The calculation of the strip cross-section FSc, which is the cross-sectional shape, can be done by drawing the outer diameter sector FSa and the inner diameter sector FSb of the wire bundle 136 using CAD (Computer Aided Design), as shown in Figure 6, and subtracting the sector FSb from the sector FSa. Here, the central angle γ of the sectors FSa and FSb are the same for both.

[0027] Specifically, as shown in Figure 7, let r be the diameter of the wire 135, R be the diameter of the insulator 120, and g be the radial gap between the wire strip model m30.h Assuming that the central angle of sectors FSa and FSb is γ1, the strip cross section Fsc1 can be calculated in the first wire bundle 131 (first wire strip model m31 after modeling) by subtracting the sector FSb, which has a radius of R / 2, from the sector FSa, which has a radius of (R+2r) / 2. The central angle γ1 is the gap g between the wires 135 around axis CL. s Assuming that the total number of bundles (number of strands) of the first strand bundle 131 and the second strand bundle 132 is m, it can be calculated by the following formula (9). Similarly, for the second strand bundle 132 (the second strand band model m32 after modeling), if the central angle of the sector shapes FSa and FSb is γ2, the radius is (r+4r+2g h From a sector shape FSa with radius (R+2r+2g) / 2, h The strip section FSc2 can be calculated by subtracting the sector shape FSb, which is set to ) / 2. At this time, the central angle γ2 of the sector shapes FSa and FSb can be calculated from the following equation (10).

[0028]

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[0029] In the braided shielded wire model M1, the shielding characteristics of the braided shielded wire 100 are analyzed by the analysis processing unit 42. The analysis processing unit 42 can output, for example, the transfer impedance Zt (Ω / m) with respect to frequency (MHz).

[0030] Figure 8 is a graph comparing the shielding characteristics of each braided shield of the braided shield wire model M1 of this embodiment and the braided shield wire model Mb created as a comparative example. In the braided shield wire model Mb, instead of modeling multiple strand bundles 136 in a strip shape, each strand 135 is modeled individually, thereby modeling the strand bundles 136 as a strand bundle model. In the comparative example, the braided shield wire model Mb does not have adjacent strands 135 in contact around the axis CL. Also, the comparative example's braided shield wire model Mb does not have the strand bundle model braided. As can be seen from Figure 8, there is almost no difference in shielding characteristics between the braided shield wire model M1 of this embodiment, which models multiple strand bundles 136 in a strip shape, and the comparative example's braided shield wire model Mb, which does not model multiple strand bundles 136 in a strip shape.

[0031] The reason for this can be explained as follows. In order to analyze the shielding performance of the braided shield 130, it is necessary to reproduce the current flow within the braided shield 130. The current flowing through the braided shield 130 flows clockwise (current ECW2 shown in Figure 2) and counterclockwise (current ECW1 shown in Figure 2) for each strand bundle 136. The magnetic field generated from one strand 135 is expressed as I / (2πd), where d is the distance from the strand 135 and I is the current flowing through the strand 135. The magnetic field generated from the strand bundle 136 is expressed using the current value obtained by summing the currents flowing through each strand 135 that make up the strand bundle 136. Furthermore, when the strand models of the strand bundle 136 are combined into a single strip model, the current value is the sum of the currents flowing through each strand 135. Therefore, the magnetic field generated in the wire bundle 136 is the same whether each individual wire is modeled as a wire bundle model or the wire models constituting the wire bundle 136 are combined into a strip and treated as a single wire strip model. From the above, even if there is contact within the wire bundle 136, the generated magnetic field is the same and does not affect the shielding performance. Therefore, the wire bundle 136 is made into a single strip model (wire strip model m30) in which multiple wires 135 are combined, and the model of the braided shield 130 is simplified. In addition, in the actual braided shielded wire 100, there is contact resistance between the first wire bundle 131 and the second wire bundle 132, and no current flows between them. To simulate this, a gap (gap g) is left between the first wire strip model m31 and the second wire strip model m32 so that no current flows between them. h ), the structure was designed to reproduce the actual flow of electric current.

[0032] As shown in Figure 8, the braided shielded wire model Mb models each individual strand 135, so modeling a braided shield 130 with a large number of strands (e.g., 1000 or more) takes a considerable amount of time. However, with the braided shielded wire model M1 of this embodiment, the strand bundle 136 can be modeled as a single strip-shaped model (strand strip model m30), which significantly reduces the time required for modeling compared to the braided shielded wire model Mb.

[0033] Next, as a modification of the present embodiment, as shown in FIGS. 9 and 10, the modeling of the braided shielded wire 100 can also be modeled as being intertwined with the first strand band model m31 and the second strand band model m32. In this case, the model creation unit 41 creates a braided shielded wire model M2 having the first strand band model m31 and the second strand band model m32 by sweeping the band cross-section when parameters are set in the variables of the following formulas (11) to (18). Formulas (11) to (18) are stored in the storage circuit 30 in advance. The parameters set in the variables of Formulas (11) to (18) are input via the input device 10. The model creation unit 41 sets the coordinates on the three-dimensional coordinates as x, y, and z. As shown in FIG. 9, the diameter of the strand 135 is r, the diameter of the insulator 120 is R, and the line length of one round around the axis CL of the strand 135 is p (see FIG. 5). The total number of strands (number of hits) of the first strand bundle 131 and the second strand bundle 132 is n, and the gap between the radial strand band models m30 is g h Let the predetermined value on the three-dimensional coordinates be t, and the distance from the center C of the core wire model m1 to the first strand band model m31 and the second strand band model m32 be r b In this case, a braided shielded wire model M2 that satisfies the following formulas (11) to (18) is created. That is, the braided shielded wire model M2 created by the model creation unit 41 satisfies the following formulas (11) to (18). In the present embodiment, since the first strand band model m31 and the second strand band model m32 are intertwined with each other, as shown in FIG. 10, the distance r b has a maximum r at a period of 4p / n b max and a minimum r b min are alternately represented (Formulas (14) and (18)). Formulas (11) to (14) represent a plurality of first strand band models m31 formed in a spiral shape along the first direction CW1 around the axis CL of the core wire model m1, and Formulas (15) to (18) represent a plurality of second strand band models m32 formed in a spiral shape along the second direction CW2 opposite to the first direction CW1 around the axis of the core wire model m1. In FIG. 9, the diameter r of the strand 135 and the diameter R of the insulator 120 are applied to the braided shielded wire model M2 and shown

[0034]

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[0035]

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[0036] Next, with reference to Figure 11, the processing procedure for the simulation method of the braided shielded wire 100 in the simulation device 1 for the braided shielded wire 100 will be described. As shown in Figure 11, the simulation method for the braided shielded wire 100 includes an input step S1 for inputting parameters, a model creation step S2 for creating a braided shielded wire model M, a model output step S3 for outputting the braided shielded wire model M, a calculation step S4 for calculating the transfer impedance, and a result output step S5 for outputting the transfer impedance. The simulation device 1 for the braided shielded wire 100 executes the above-described input step S1, model creation step S2, model output step S3, calculation step S4, and result output step S5 by executing a simulation program for the braided shielded wire 100 that has been previously stored in the memory circuit 30.

[0037] In the braided shielded wire simulation device 1, the input device 10 performs an input step S1 via the operation input device 11 to input parameters for setting the variables in the above-mentioned equations (1) to (8) or equations (11) to (18). For example, the input device 10 receives "20" as the parameter to be set for the variable "n", which is the total number of bundles (number of strands) of the first strand bundle 131 and the second strand bundle 132. The input device 10 also receives the variable "r", which is the diameter of the strand 135; the variable "R", which is the diameter of the insulator 120; the variable "p", which is the length of the strand 135 around the axis CL; and the variable "g", which is the gap between the radial strand band models m30. h A predetermined value is entered as the parameter to be set for each of these.

[0038] Next, the model creation unit 41 of the processing circuit 40 sets the parameters entered in input step S1 into variables of equations (1) to (8) or equations (11) to (18) and executes model creation step S2 to create braided shielded wire models M(M1,M2). The model creation unit 41, for example as shown in Figures 3 and 4, includes a layer in which a plurality of first strand band models m31 are formed spirally along a first direction CW1 around the axis CL of the core wire model m1, and a layer provided outside the layer (i.e., the first strand band models m31) at a distance from the said layer, in which a plurality of second strand band models m32 are formed spirally along a second direction CW2 opposite to the first direction CW1 around the axis CL of the core wire model m1, thereby creating a braided shielded wire model M1 in which the first strand band models m31 and the second strand band models m32 are not braided together, or a braided shielded wire model M2 in which the first strand band models m31 and the second strand band models m32 are braided together.

[0039] Next, the model creation unit 41 of the processing circuit 40 executes a model output step S3, which outputs the braided shield wire model M(M1,M2) created in the model creation step S2 to the analysis processing unit 42. Alternatively, in the model output step S3, the model creation unit 41 may output the braided shield wire model M to the storage circuit 30 and store the braided shield wire model M(M1,M2) in the storage circuit 30.

[0040] Next, the analysis processing unit 42 of the processing circuit 40 executes a calculation step S4 to calculate the shielding characteristics (transfer impedance) of the braided shielded wire based on the braided shielded wire model M(M1,M2) output by the model creation unit 41.

[0041] Next, the output device 20 executes a result output step S5, which outputs the shielding characteristics (transmission impedance) of the braided shielded wire 100 calculated in calculation step S4. The output device 20 then displays the shielding characteristics (transmission impedance) of the braided shielded wire 100 on the display device 21 as a simulation result, and terminates the process.

[0042] As shown in Figure 12, a graph comparing the transfer impedance of each coaxial shielded wire model and the braided shielded wire 100, it is known that the transfer impedance of the braided shielded wire model M1, which models the first strand band model m31 and the second strand band model m32 as not being braided together, and the braided shielded wire model M2, which models the first strand band model m31 and the second strand band model m32 as being braided together, are equivalent. Furthermore, when comparing the aforementioned braided shielded wire model Mb, which models multiple strands 135 individually without braiding, with the braided shielded wire model Mba, which models multiple strands 135 individually and includes braiding, the transfer impedance is equivalent. These braided shielded wire models M1, M2, Mb, and Mba also show equivalent results in terms of transfer impedance when compared with the measured values ​​of the braided shielded wire 100.

[0043] The simulation device 1, which is a modeling device for the braided shielded wire 100 described above, includes a model creation unit 41 that creates a braided shielded wire model M(M1,M2) that reproduces the current flowing through the braided shield 130 of the braided shielded wire 100, which is composed of a conductive core wire 110, an insulator 120 covering the core wire 110, and a braided shield 130 provided around the insulator 120 and having multiple strand bundles 136 formed by bundling multiple strands 135. The braided shielded wire model M(M1,M2) includes a core wire model m1 corresponding to the core wire 110, an insulator model m2 corresponding to the insulator 120, and a braided shield model m3 corresponding to the braided shield 130. The braided shield model m3 includes multiple strand strip models m30 that model the strand bundles 136 in a strip shape, and the multiple strand strip models m30 are spaced apart from each other.

[0044] As a result, even with a braided shield 130 having a large number of strands 135, it is not necessary to model each strand 135 individually, but rather to model the strand bundle 136 as a single strand band model m30. This allows for the creation of a simple braided shield wire model M(M1,M2) and reduces the time required to model the braided shield wire 100, thereby enabling a proper reduction in the time required to model the braided shield wire 100.

[0045] Furthermore, the braided shield 130 comprises multiple strand bundles 136, including a first strand bundle 131 arranged spirally along a first direction CW1 around the axis CL of the core wire 110, and a second strand bundle 132 arranged spirally along a second direction CW2 around the axis CL in the opposite direction to the first direction CW1, and braided with the first strand bundle 131. The braided shield model m3 includes a first strand band model m31 and a second strand band model m32, which model the first strand bundle 131 and the second strand bundle 132 as strand band models m30, respectively. The first strand band model m31 and the second strand band model m32 are modeled as not being braided with each other, and the second strand band model m32 is positioned outside the first strand band model m31. This allows the first strand bundle 131 and the second strand bundle 132 of the braided shield 130, which are interwoven with each other, to be modeled without interweaving them, thereby further reducing the time required for modeling.

[0046] Furthermore, the simulation device 1 for the braided shielded wire 100 is further equipped with an input device 10 as an input unit for inputting parameters, and the model creation unit 41 creates a braided shielded wire model M1 based on the parameters input to the input device 10. If the coordinates on the 3D coordinate system are x, y, and z, the diameter of the strand 135 is r, the diameter of the insulator 120 is R, the length of the strand 135 around the axis CL is p, the total number of strands of the first strand bundle 131 and the second strand bundle 132 is n, the gap between the first strand band model m31 and the second strand band model m32 is gh, a predetermined value on the 3D coordinate system is t, the distance from the center of the core wire model m1 to the second strand band model m32 is r1, and the distance from the center of the core wire model m1 to the first strand band model m31 is r2, then the above equations (1) to (8) are satisfied. As a result, various braided shielded wire models M1 can be easily created by setting parameters.

[0047] Furthermore, the multiple strand bundles 136 of the braided shield 130 include a first strand bundle 131 that is spirally arranged along a first direction CW1 around the axis CL of the core wire 110, and a second strand bundle 132 that is spirally arranged along a second direction CW2 around the axis CL in the opposite direction to the first direction CW1 and is braided with the first strand bundle 131. The braided shield model m3 includes a first strand band model m31 and a second strand band model m32, which model the first strand bundle 131 and the second strand bundle 132 as strand band models m30, respectively, and the first strand band model m31 and the second strand band model m32 are modeled as being braided together. This makes it possible to form a braided shielded wire model M2 by braiding the first strand band model m31 and the second strand band model m32 in accordance with the braided first strand bundle 131 and the second strand bundle 132.

[0048] Furthermore, the simulation device 1 for the braided shielded wire 100 is further equipped with an input device 10 as an input unit for inputting parameters, and the model creation unit 41 creates a braided shielded wire model M2 based on the parameters input to the input device 10, where x, y, and z are the coordinates in the three-dimensional coordinate system, r is the diameter of the strand 135, R is the diameter of the insulator 120, p is the length of the strand 135 around the axis CL, n is the total number of strands of the first strand bundle 131 and the second strand bundle 132, and g is the gap between the first strand band model m31 and the second strand band model m32. h Let t be a predetermined value in the 3D coordinate system, and let r be the distance from the center C of the core wire model m1 to the first strand band model m31 and the second strand band model m32. b In this case, equations (11) to (18) above are satisfied. This makes it possible to easily create various braided shielded wire models M2 in which the strand model m30 is woven by setting the parameters.

[0049] Furthermore, the modeling method for the braided shielded wire 100 includes a model creation step S2 to create a braided shielded wire model M(M1,M2) that reproduces the current flowing through the braided shield 130 of the braided shielded wire 100, which is composed of a conductive core wire 110, an insulator 120 surrounding the core wire 110, and a braided shield 130 provided around the insulator 120 and having multiple strand bundles 136 formed by bundling multiple strands 135. In the model creation step S2, the braided shield model m3 includes multiple strand strip models m30 that model the strand bundles 136 in a strip shape, and the multiple strand strip models m30 are spaced apart from each other. Furthermore, the modeling program for the braided shielded cable 100 allows the computer to execute the model creation step S2. This modeling method effectively reduces the time required for modeling the braided shielded cable 100, and the modeling program allows the computer to effectively reduce the time required for modeling the braided shielded cable 100.

[0050] It should be noted that the braided shield wire modeling apparatus, braided shield wire modeling method, and braided shield wire modeling program according to the embodiments of the present invention described above are not limited to the embodiments described above, and various modifications are possible within the scope of the claims.

[0051] In the above description, the braided shield 130 of the braided shielded wire 100 was formed by weaving together a first strand bundle 131 and a second strand bundle 132, but it may also be formed by weaving together multiple strand bundles 136. In this case, for example, the braided shielded wire model M1 may have multiple strand band models m30 around the axis CL on the outside of the second strand band model m32. Also, the braided shielded wire model M2 can be modeled by weaving together multiple strand band models m30, following the example of the braided shield 130 of the braided shielded wire 100. Furthermore, in the braided shield 130 having multiple strand bundles 136, it is also possible to model the braided shielded wire model M by weaving together multiple strand band models m30 that model some of the multiple strand bundles 136 in a strip shape, and not weaving together multiple strand band models m30 that model other parts of the multiple strand bundles 136 in a strip shape. Furthermore, in the first braided shielded cable model M, it is also possible to create the braided shielded cable model M by mixing a strip-shaped wire strip model m30 with a wire bundle model that is not modeled in a strip shape (each wire 135 is modeled individually). In addition, the diameter r of the wire 135 and the gap g between the first wire strip model m31 and the second wire strip model m32 are also considered. h By setting this value to 0, it is also possible to model multiple strand band models m30 with a thickness of 0.

[0052] The program executed by the processor is provided pre-installed in the memory circuit 30, etc. Alternatively, this program may be provided as a file in an installable or executable format for these devices, recorded on a computer-readable storage medium. Furthermore, this program may be stored on a computer connected to a network such as the Internet and provided or distributed by download via the network.

[0053] The braided shield wire modeling apparatus, braided shield wire modeling method, and braided shield wire modeling program according to this embodiment may be configured by appropriately combining the components of the embodiments and modified examples described above. [Explanation of Symbols]

[0054] 1: Simulation device (modeling device) 10: Input device (input section) 41: Model Creation Department 100: Braided shielded wire 110: Core wire 120: Insulator 130: Braided Shield 131:First wire bundle 132:Second wire bundle 135: Stranded wire 136: Wire bundle C: Center CL: Axis CW1: 1st direction CW2: 2nd direction M, M1, M2, Mb: Braided shielded wire model S2: Model creation step m1: Core wire model m2: Insulator model m3: Braided Shield Model m30: Strand model m31: First wire band model m32: Second wire band model

Claims

1. The system includes a model creation unit for creating a model of a braided shielded wire that reproduces the current flowing through the braided shield of a braided shielded wire, which is composed of a conductive core wire, an insulator covering the core wire, and a braided shield provided around the insulator with multiple bundles of strands formed by bundling multiple strands together. The braided shielded wire model includes a core wire model corresponding to the core wire, an insulator model corresponding to the insulator, and a braided shield model corresponding to the braided shield. The braided shield model includes a plurality of wire strip models in which the wire bundle is modeled in a strip shape, Multiple of the aforementioned wire band models are spaced apart from each other. Modeling device for braided shielded cables.

2. The plurality of strand bundles of the braided shield include a first strand bundle arranged spirally along a first direction about the axis of the core wire, and a second strand bundle arranged spirally along a second direction about the axis opposite to the first direction and braided with the first strand bundle. The braided shield model includes a first wire band model and a second wire band model, which model the first wire bundle and the second wire bundle as the wire band model, respectively. The first and second strand band models are modeled as not being interwoven with each other, and the second strand band model is positioned outside the first strand band model. Modeling apparatus for braided shielded wires according to claim 1.

3. It further includes an input section for entering parameters, The model creation unit creates the braided shielded wire model based on the parameters input to the input unit, where x, y, and z are the coordinates in three dimensions, r is the diameter of the wire, R is the diameter of the insulator, p is the length of the wire around the axis of the wire, n is the total number of bundles of the first and second wire bundles, and g is the gap between the first wire bundle model and the second wire bundle model. ｈ Let t be a predetermined value on the three-dimensional coordinate system, and let r be the distance from the center of the core wire model to the second strand band model. １ Let r be the distance from the center of the core wire model to the first strand model. ２ In this case, create the braided shielded wire model that satisfies the following equations (1) to (8): Modeling apparatus for braided shielded wires according to claim 2. [Math 1] [Math 2]

4. The plurality of strand bundles of the braided shield include a first strand bundle arranged spirally along a first direction about the axis of the core wire, and a second strand bundle arranged spirally along a second direction about the axis opposite to the first direction and braided with the first strand bundle. The braided shield model includes a first wire band model and a second wire band model, which model the first wire bundle and the second wire bundle as the wire band model, respectively. The first and second wire band models are modeled as being interwoven with each other. Modeling apparatus for braided shielded wires according to claim 1.

5. It further includes an input section for entering parameters, The model creation unit creates the braided shielded wire model based on the parameters input to the input unit, where x, y, and z are the coordinates in three dimensions, r is the diameter of the wire, R is the diameter of the insulator, p is the length of the wire around the axis of the wire, n is the total number of bundles of the first and second wire bundles, and g is the gap between the first wire bundle model and the second wire bundle model. ｈ Let t be a predetermined value on the three-dimensional coordinate system, and let r be the distance from the center of the core wire model to the first wire band model and the second wire band model. ｂ In this case, create the braided shielded wire model that satisfies the following equations (9) to (16): Modeling apparatus for braided shielded wires according to claim 3. [Math 3] [Math 4]

6. When creating a model of a braided shielded wire that reproduces the current flowing through the braided shield of a braided shielded wire comprising a conductive core wire, an insulator covering the core wire, and a braided shield provided around the insulator with multiple bundles of strands formed by bundling multiple strands, the model creation step includes creating the braided shielded wire model which includes a core wire model corresponding to the core wire, an insulator model corresponding to the insulator, and a braided shield model corresponding to the braided shield, wherein the braided shield model includes multiple strand strip models which model the strand bundles in a strip shape, and the multiple strand strip models are spaced apart from each other. Modeling method for braided shielded cables.

7. This is a program for causing a computer to execute a model creation step to create a model of a braided shielded wire that reproduces the current flowing through the braided shield of a braided shielded wire, which comprises a conductive core wire, an insulator covering the core wire, and a braided shield model that includes a core wire model corresponding to the core wire, an insulator model corresponding to the insulator, and a braided shield model corresponding to the braided shield, when creating a model of a braided shielded wire that reproduces the current flowing through the braided shield of a braided shielded wire, which comprises a core wire model corresponding to the core wire, an insulator model corresponding to the insulator, and a braided shield model corresponding to the braided shield. In the model creation step, the braided shield model includes a plurality of wire strip models in which the wire bundle is modeled in a strip shape, and the plurality of wire strip models are spaced apart from each other. A modeling program for braided shielded cables.

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