Braided shielded wire modeling device, braided shielded wire modeling method, and braided shielded wire modeling program

Abstract

To provide a modeling apparatus for a braided shield wire capable of properly modeling the braided shield wire.SOLUTION: A simulating apparatus for a braided shield wire comprises a model creation unit that creates a simple braided shield wire model M that reproduces electric current flowing through a braided shield of an actual braided shield wire. The model creation unit 41 includes: a first layer L1 in which a plurality of first wire bundle models m31 are spirally formed along a first direction around an axis of a core wire model m1; and a second layer L2 provided outside the first layer L1 in a separated state from the first layer L1, in which a plurality of second wire bundle models m32 are spirally formed along a second direction opposite to the first direction around the axis of the core wire model to form the simple braided shield wire model in which a first wire bundle model m31 of the first layer L1 and the second wire bundle model m32 of the second layer L2 are not intertwined.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a braided shielded wire modeling device, a braided shielded wire modeling method, and a braided shielded wire modeling program. [Background technology]

[0002] As a conventional method for modeling a braided shielded electric wire, for example, Patent Document 1 describes an electromagnetic field strength calculation method in which a multi-core stranded-wire shielded cable is modeled, the multi-core stranded-wire shielded cable having a twisted-wire cable in which conductor wires made of coated conductor portions are twisted in the length direction, a shielding layer that covers the outer periphery of the twisted-wire cable in the length direction, and an insulator filled between the conductor wires and the shielding layer, and the strength of the electromagnetic field formed by electromagnetic waves emitted from the multi-core stranded-wire shielded cable is calculated by a simulation that applies the method of moments to the model. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-204804 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in the electromagnetic field strength calculation method described in the above-mentioned Patent Document 1, for example, when the shielding layer is a braided shield formed by weaving wire bundles, if a model that faithfully reproduces the shape of the braided shield is created, there is a risk that the simulation results of the braided shield model will differ from those of the actual braided shield due to contact resistance between the wire bundles, and in this regard, there is room for further improvement.

[0005] Therefore, the present invention has been made in view of the above, and has an object to provide a braided shielded electric wire modeling device, a braided shielded electric wire modeling method, and a braided shielded electric wire modeling program that are capable of appropriately modeling a braided shielded electric wire. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, a modeling device for a braided shielded electric wire according to the present invention includes a model creation unit that creates a simplified braided shielded electric wire model that reproduces a current flowing through the braided shield of a braided shielded electric wire that includes a conductive core wire, an insulator that covers the core wire, and a braided shield that is provided around the insulator and is formed by braiding each of a plurality of wire bundles, the model creation unit creating a core wire model corresponding to the core wire, an insulator model corresponding to the insulator, a plurality of first wire bundle models corresponding to the plurality of wire bundles, and and a braided shield model having a plurality of second wire bundle models, and the simplified braided shield electric wire model is created including: a first layer in which the plurality of first wire bundle models are spirally formed in a first direction around the axis of the core wire model; and a second layer that is spaced apart from the first layer and is provided outside the first layer in which the plurality of second wire bundle models are spirally formed in a second direction around the axis of the core wire model that is opposite to the first direction, and the simplified braided shield electric wire model is created in which the first wire bundle models of the first layer and the second wire bundle models of the second layer are not braided.

[0007] A method for modeling a braided shielded electric wire according to the present invention includes a conductive core wire, an insulator covering the core wire, and a braided shield formed by braiding a plurality of wire bundles formed by bundling wires and braiding the respective wire bundles, and when creating a simplified braided shielded electric wire model that reproduces a current flowing through the braided shield of a braided shielded electric wire including a conductive core wire, an insulator covering the core wire, and a braided shield formed by braiding a plurality of wire bundles formed by bundling wires and braiding the respective wire bundles, the method includes the step of creating a simplified braided shielded electric wire model that reproduces a current flowing through the braided shield of a braided shielded electric wire including a core wire model corresponding to the core wire, an insulator model corresponding to the insulator, and a braided shield model having a plurality of first wire bundle models and a plurality of second wire bundle models corresponding to the plurality of wire bundles. The method further comprises a model creation step of creating the simplified braided shielded electric wire model, wherein the model creation step creates the simplified braided shielded electric wire model including: a first layer in which the plurality of first wire bundle models are spirally formed along a first direction around the axis of the core wire model; and a second layer that is spaced apart from the first layer and is provided outside the first layer in which the plurality of second wire bundle models are spirally formed along a second direction around the axis of the core wire model that is opposite to the first direction, and wherein the first wire bundle models of the first layer and the second wire bundle models of the second layer are not braided together.

[0008] A modeling program for a braided shielded electric wire according to the present invention provides a simplified braided shielded electric wire model that reproduces a current flowing through the braided shield of a braided shielded electric wire including a conductive core wire, an insulator surrounding the core wire, and a braided shield formed by braiding each of a plurality of wire bundles formed by bundling a conductive core wire, the braided shield being provided around the insulator, the simplified braided shielded electric wire model including a core wire model corresponding to the core wire, an insulator model corresponding to the insulator, and a braided shield model having a plurality of first wire bundle models and a plurality of second wire bundle models corresponding to the plurality of wire bundles. The program is for causing a computer to execute a model creation step of creating an electric wire model, wherein the model creation step creates a simplified braided shielded electric wire model including: a first layer in which the plurality of first wire bundle models are spirally formed along a first direction around the axis of the core wire model; and a second layer that is spaced apart from the first layer and is provided outside the first layer in which the plurality of second wire bundle models are spirally formed along a second direction around the axis of the core wire model that is opposite to the first direction, and wherein the first wire bundle models of the first layer and the second wire bundle models of the second layer are not braided together. [Effects of the Invention]

[0009] The braided shielded electric wire modeling device, braided shielded electric wire modeling method, and braided shielded electric wire modeling program according to the present invention can simulate the contact resistance that occurs between the layers by separating the first and second layers of the braided shield model, and can create a braided shielded electric wire model that recreates the spiral current flow that flows in an actual braided shielded electric wire. Furthermore, the braided shielded electric wire modeling device, braided shielded electric wire modeling method, and braided shielded electric wire modeling program can create a simplified braided shielded electric wire model by not braiding the first wire bundle model and the second wire bundle model, and as a result, can properly model the braided shielded electric wire. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a block diagram showing an example of the configuration of a simulation device for a braided shielded electric wire according to an embodiment. [Figure 2] FIG. 2 is a side view showing a configuration example of a braided shielded electric wire model according to an embodiment. [Figure 3] FIG. 3 is a cross-sectional view taken along the line NN in FIG. [Figure 4] FIG. 4 is a diagram showing the wire length of one turn around the axis of the wire model according to the embodiment. [Figure 5] FIG. 5 is a cross-sectional view showing an example of the configuration of three types of braided shielded electric wire models. [Figure 6] FIG. 6 shows the transfer impedance of three types of braided shielded wire models. [Figure 7] FIG. 7 is a diagram showing the transfer impedance with and without braiding (braiding rate 60%). [Figure 8] FIG. 8 is a diagram showing the transfer impedance with and without braiding (braiding rate 80%). [Figure 9] FIG. 9 is a flowchart showing the processing steps of the braided shielded wire simulation method according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Modes (embodiments) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited to the contents described in the following embodiments. Furthermore, the components described below include those that can be easily imagined by a person skilled in the art and those that are substantially the same. Furthermore, the configurations described below can be combined as appropriate. Furthermore, various omissions, substitutions, or modifications of the configuration can be made within the scope of the gist of the present invention.

[0012] [Embodiment] A braided shielded electric wire simulation device 1 according to an embodiment will be described with reference to the drawings. The braided shielded electric wire simulation device 1 is an example of a braided shielded electric wire modeling device, and creates a simple braided shielded electric wire model M that reproduces the current flowing through the braided shield of the braided shielded electric wire, and analyzes the shielding characteristics of the braided shielded electric wire by performing a three-dimensional electromagnetic field simulation based on the simple braided shielded electric wire model M. In the embodiment, the braided shielded electric wire simulation device 1 stores in advance a mathematical formula for creating the simple braided shielded electric wire model M, which will be described later, and creates the simple braided shielded electric wire model M by setting parameters for the variables of the mathematical formula. The braided shielded electric wire simulation device 1 can be realized by various computer devices, such as a personal computer, a workstation, or a tablet terminal.

[0013] Here, the braided shielded electric wire (not shown) to be simulated constitutes, for example, a wire harness mounted on a vehicle, and is applied to a communication cable or a high-voltage cable. The braided shielded electric wire includes a conductive core wire, an insulator covering the core wire, and a braided shield provided around the insulator. The braided shield is formed by weaving together a plurality of element wires, and blocks noise. For example, the diameter of each element wire in the braided shield is about 0.1 mm, and in the case of a high-voltage cable, the number of element wires may exceed 1,000. The braided shield is modeled in three dimensions (X coordinate, Y coordinate, Z coordinate) by a simulation device 1 for a braided shielded electric wire. The simulation device 1 for a braided shielded electric wire will be described in detail below.

[0014] 1, the braided shielded wire simulation device 1 includes an input device 10 as an input section, an output device 20, a memory circuit 30, and a processing circuit 40. The input device 10, the output device 20, the memory circuit 30, and the processing circuit 40 are connected to each other via a network so that they can communicate with each other.

[0015] The input device 10 is a device that can input information to the braided shielded electric wire simulation device 1. The input device 10 includes, for example, an operation input device 11 and a data input device 12 as devices for performing various inputs to the braided shielded electric wire simulation device 1. The operation input device 11 is a device that accepts various operation inputs (information inputs) from a user. The operation input device 11 is realized 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 accepts various data inputs (information inputs) from other devices outside the braided shielded electric wire simulation device 1. The data input device 12 is realized by, for example, a communication interface that sends and receives various data to and from the device via communication, whether wired or wireless, and a recording medium interface that reads various data from recording media such as a hard disk drive (HDD), solid state drive (SSD), flexible disk (FD), magneto-optical disk, CD-ROM, DVD, USB memory, SD card memory, and flash memory.

[0016] The output device 20 is a device capable of outputting information from the braided shielded electric wire simulation device 1. The output device 20 includes, for example, a display device 21 and a data output device 22 as devices for performing various outputs from the braided shielded electric wire simulation device 1. The display device 21 is a device that outputs and displays various types of image information. The display device 21 is realized by, for example, an image display device such as a liquid crystal display, a plasma display, or an organic EL display. The data output device 22 is a device that outputs data (information) to other devices outside the braided shielded electric wire simulation device 1. The data output device 22 is realized by, for example, a communication interface that transmits and receives various types of data to devices via communication, whether wired or wireless, or a recording medium interface that writes various types of data to a recording medium similar to the above. Note that the data input device 12 and the data output device 22 may share some or all of their configurations.

[0017] The memory circuit 30 is a circuit that stores various data (information). The memory circuit 30 is realized, for example, by a semiconductor memory element such as a RAM (Random Access Memory) or a flash memory, a hard disk, an optical disk, or the like. The memory circuit 30 stores, for example, programs that enable the braided shielded electric wire simulation device 1 to realize various functions. The programs stored in the memory circuit 30 include a program that causes the input device 10 to function, a program that causes the output device 20 to function, and a program that causes the processing circuit 40 to function (for example, a braided shielded electric wire simulation program described below). The memory circuit 30 also stores various data, such as data input via the input device 10, data required for various processes in the processing circuit 40, and data output via the output device 20. These various data are read out from the memory circuit 30 by the processing circuit 40, etc., as needed. The memory circuit 30 may also be realized by a cloud server, etc., connected to the braided shielded electric wire simulation device 1 via a network.

[0018] The processing circuit 40 is a circuit that realizes various processing functions in the braided shielded electric wire simulation device 1. The processing circuit 40 is realized by, for example, a processor. The processor refers to circuits such as a CPU (Central Processing Unit), an MPU (Micro Processing Unit), an ASIC (Application Specific Integrated Circuit), and an FPGA (Field Programmable Gate Array). The processing circuit 40 realizes each processing function by, for example, executing a program read from the storage circuit 30.

[0019] The outline of the overall configuration of the braided shielded electric wire simulation device 1 according to this embodiment has been described above. With this configuration, the processing circuit 40 according to this embodiment creates a simple braided shielded electric wire model M that reproduces the current flowing in the braided shield of the braided shielded electric wire, as shown in Figs. 2 to 4, and analyzes the shielding characteristics of the braided shielded electric wire by performing a three-dimensional electromagnetic field simulation based on the simple braided shielded electric wire model M. The processing circuit 40 is configured to include a model creation unit 41 and an analysis processing unit 42.

[0020] The model creation unit 41 creates a simple braided shielded electric wire model M that reproduces the current flowing through the braided shield of the braided shielded electric wire.

[0021] 2 and 3, the model creation unit 41 creates a simplified braided shield electric wire model M including a core wire model m1 corresponding to the core wire, an insulator model m2 corresponding to the insulator, and a braided shield model m3 having a plurality of first wire bundle models m31 and a plurality of second wire bundle models m32 corresponding to a plurality of wire bundles. When creating the braided shield model m3 of this simplified braided shield electric wire model M, the model creation unit 41 separates the plurality of first wire bundle models m31 and the plurality of second wire bundle models m32 and does not interweave the plurality of first wire bundle models m31 and the plurality of second wire bundle models m32. In other words, the model creation unit 41 creates a simplified braided shield electric wire model M including a first layer L1 in which a plurality of first wire bundle models m31 are spirally formed along a first direction around the axis of the core wire model m1, and a second layer L2 that is provided outside the first layer L1 and spaced apart from the first layer L1, and in which a plurality of second wire bundle models m32 are spirally formed along a second direction that is the opposite direction to the first direction around the axis of the core wire model m1, and in which the first wire bundle models m31 of the first layer L1 and the second wire bundle models m32 of the second layer L2 are not interwoven. That is, in the simplified braided shield electric wire model M, the braided shield model m3 created by the model creation unit 41 does not interweave the first wire bundle models m31 of the first layer L1 and the second wire bundle models m32 of the second layer L2. More specifically, the first wire bundle model m31 of the first layer L1 is formed in a spiral shape along a first direction around the axis of the core wire model m1 inside the second wire bundle model m32 of the second layer L2. The second wire bundle model m32 of the second layer L2 is formed in a spiral shape along a second direction around the axis of the core wire model m1 so as to cover the outside of the first wire bundle model m31 of the first layer L1 while being spaced apart from the first wire bundle model m31 of the first layer L1. In the simplified braided shield electric wire model M, in the first wire bundle model m31 of the first layer L1, adjacent wire models m30 are in contact with each other. Similarly, in the second wire bundle model m32 of the second layer L2, adjacent wire models m30 are in contact with each other.

[0022] The model creation unit 41 creates the above-mentioned simplified braided shield electric wire model M by setting parameters for the variables of the following formulas (1) to (12). Formulas (1) to (12) are stored in advance in the storage circuit 30. The parameters to be set for the variables of formulas (1) to (12) are input via the input device 10. As shown in FIGS. 2 to 4, the model creation unit 41 defines the coordinates on the three-dimensional coordinate system as x, y, and z, the diameter of the wire model m30 corresponding to the wire as r, the diameter of the insulator model m2 as R, the wire length of one turn around the axis of the wire model m30 as p, the number of wire models m30 (strand count) constituting each of the first wire bundle model m31 and the second wire bundle model m32 as n, the total number of bundles (number of bundles) of the first wire bundle model m31 and the second wire bundle model m32 as m, and the gap between the wire models m30 around the axis as g. s The radial gap between the wire models m30 is g h where t is a predetermined value on the three-dimensional coordinate system, r1 is the distance from the center C of the core wire model m1 to the wire model m30 of the second wire bundle model m32, α1 is the angle formed by the adjacent wire models m30 of the second wire bundle model m32, r2 is the distance from the center C of the core wire model m1 to the wire model m30 of the first wire bundle model m31, and α2 is the angle formed by the adjacent wire models m30 of the first wire bundle model m31, then a simplified braided shield electric wire model M is created that satisfies the following formulas (1) to (12). That is, the simplified braided shield electric wire model M created by the model creation unit 41 satisfies the following formulas (1) to (12). Equations (1) to (6) represent a first layer L1 in which a plurality of first wire bundle models m31 are spirally formed along a first direction around the axis of the core wire model m1, and equations (7) to (12) represent a second layer L2 in which a plurality of second wire bundle models m32 are spirally formed along a second direction opposite to the first direction around the axis of the core wire model m1. Note that the above-mentioned angle α1 is the angle between a line segment connecting the center C of the core wire model m1 and the wire model m30 in an adjacent wire model m30 of the second wire bundle model m32. Furthermore, angle α2 is the angle between a line segment connecting the center C of the core wire model m1 and the wire model m30 in an adjacent wire model m30 of the first wire bundle model m31.

[0023]

number

[0024]

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[0025]

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[0026]

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[0027] The analysis processing unit 42 analyzes the shielding characteristics of the braided shielded electric wire based on the simplified braided shielded electric wire model M created by the model creation unit 41. Here, Fig. 5 shows cross-sectional views illustrating configuration examples of three types of simplified braided shielded electric wire models M, M1, and M2. As described above, in the simplified braided shielded electric wire model M, the first wire bundle model m31 in the first layer L1 and the second wire bundle model m32 in the second layer L2 are separated from each other, and adjacent wire models m30 in the first wire bundle model m31 in the first layer L1 and the second wire bundle model m32 in the second layer L2 are in contact with each other. In the simplified braided shield electric wire model M1, the first wire bundle model m31 in the first layer L1 and the second wire bundle model m32 in the second layer L2 are spaced apart, and adjacent wire models m30 in the first wire bundle model m31 in the first layer L1 and the second wire bundle model m32 in the second layer L2 are spaced apart, as shown in Fig. 5. In the simplified braided shield electric wire model M2, the first wire bundle model m31 in the first layer L1 and the second wire bundle model m32 in the second layer L2 are in contact, and adjacent wire models m30 in the first wire bundle model m31 in the first layer L1 and the second wire bundle model m32 in the second layer L2 are in contact with each other, as shown in Fig. 5.

[0028] Fig. 6 shows the transfer impedance (shielding characteristics) of the simplified braided shield electric wire models M, M1, and M2 analyzed by the analysis processing unit 42, as well as the transfer impedance of an actual braided shield electric wire. In Fig. 6, the vertical axis represents transfer impedance, and the horizontal axis represents frequency. According to the analysis results of Fig. 6, the simplified braided shield electric wire models M and M1, in which the first wire bundle model m31 of the first layer L1 and the second wire bundle model m32 of the second layer L2 are separated from each other, exhibit results that are roughly equivalent to the transfer impedance of an actual braided shield electric wire. On the other hand, the simplified braided shield electric wire model M2, in which the first wire bundle model m31 of the first layer L1 and the second wire bundle model m32 of the second layer L2 are in contact with each other, exhibits results that are significantly different from the transfer impedance of an actual braided shield electric wire. As a result, when creating the simplified braided shield electric wire model M (M1), it is necessary to separate the first wire bundle model m31 of the first layer L1 from the second wire bundle model m32 of the second layer L2. The reason for this is that in an actual braided shield electric wire, contact resistance exists between the first wire bundle of the first layer and the second wire bundle of the second layer, and no current flows between them. In order to simulate this, it is necessary to separate the first wire bundle model m31 of the first layer L1 from the second wire bundle model m32 of the second layer L2. That is, in an actual braided shield electric wire, current flows spirally in the first wire bundle of the first layer and in the second wire bundle of the second layer, but no current flows between the first wire bundle of the first layer and the second wire bundle of the second layer, so it is necessary to simulate this current flow. In the first wire bundle model m31 of the first layer L1 and the second wire bundle model m32 of the second layer L2, adjacent wire models m30 may be in contact with each other (simple braided shield electric wire model M), or adjacent wire models m30 may be spaced apart from each other (simple braided shield electric wire model M1). Fig. 7 shows the transfer impedance (braiding ratio 60%) when the wire bundle is braided and when the wire bundle is not braided, and Fig. 8 shows the transfer impedance (braiding ratio 80%) when braided and when not braided. It can be seen that the transfer impedance with and without braiding at each braiding ratio shows equivalent results.This shows that whether or not the wire bundle is braided when creating the simple braided shielded wire model M has almost no effect on the analysis results.

[0029] Next, the processing steps of the braided shielded electric wire simulation method in the braided shielded electric wire simulation device 1 will be described with reference to Fig. 9. As shown in Fig. 9, the braided shielded electric wire simulation method includes an input step S1 for inputting parameters, a model creation step S2 for creating a simplified braided shielded electric wire model M, a model output step S3 for outputting the simplified braided shielded electric wire model M, a calculation step S4 for calculating the transfer impedance, and a result output step S5 for outputting the transfer impedance. The braided shielded electric wire simulation device 1 executes a braided shielded electric wire simulation program stored in advance in the storage circuit 30, thereby executing the above-mentioned input step S1, model creation step S2, model output step S3, calculation step S4, and result output step S5.

[0030] In the simulation device 1 for a braided shielded electric wire, the input device 10 executes an input step S1 in which parameters to be set to the variables of the above-mentioned formulas (1) to (12) are input via the operation input device 11. For example, the input device 10 inputs "5" as a parameter to be set to the variable "n" which is the number of strands (number of strands) of the wire model m30, and "16" as a parameter to be set to the variable "m" which is the total number of bundles (number of strands) of the first wire bundle model m31 and the second wire bundle model m32. The input device 10 also inputs a variable "r" which is the diameter of the wire model m30, a variable "R" which is the diameter of the insulator model m2, a variable "p" which is the wire length of one turn around the axis of the wire model m30, a variable "g" which is the gap between the wire models m30 around the axis, and a variable "r" which is the diameter of the insulator model m2. s ”, and the variable “g” which is the radial gap between the wire models m30. h Predetermined values ​​are input as parameters to be set for each of the items ".

[0031] Next, the model creation unit 41 of the processing circuit 40 executes a model creation step S2 in which the parameters input in the input step S1 are set as variables of Equations (1) to (12) to create a simplified braided shield electric wire model M. As shown in Figs. 2 and 3, for example, the model creation unit 41 creates a simplified braided shield electric wire model M including a first layer L1 in which a plurality of first wire bundle models m31 are spirally formed along a first direction around the axis of the core wire model m1, and a second layer L2 that is provided outside the first layer L1 and spaced apart from the first layer L1, and in which a plurality of second wire bundle models m32 are spirally formed along a second direction opposite to the first direction around the axis of the core wire model m1, and in which the first wire bundle models m31 of the first layer L1 and the second wire bundle models m32 of the second layer L2 are not braided together.

[0032] Next, the model creation unit 41 of the processing circuitry 40 executes a model output step S3 in which the simplified braided shield electric wire model M created in the model creation step S2 is output to the analysis processing unit 42. Note that in the model output step S3, the model creation unit 41 may output the simplified braided shield electric wire model M to the storage circuitry 30 and store the simplified braided shield electric wire model M in the storage circuitry 30.

[0033] Next, the analysis processing unit 42 of the processing circuit 40 executes a calculation step S4 of calculating the shielding characteristics (transfer impedance) of the braided shielded electric wire based on the simplified braided shielded electric wire model M output by the model creating unit 41.

[0034] Next, the output device 20 executes a result output step S5 in which the shielding characteristics (transfer impedance) of the braided shielded electric wire calculated in the calculation step S4 are output. The output device 20 displays the shielding characteristics (transfer impedance) of the braided shielded electric wire on the display device 21 as a simulation result, for example, and ends the process.

[0035] As described above, the simulation device 1 for a braided shielded electric wire according to the embodiment includes a model creation unit 41 that creates a simplified braided shielded electric wire model M that reproduces the current that flows through the braided shield of an actual braided shielded electric wire. The model creation unit 41 creates the simplified braided shielded electric wire model M that includes a core wire model m1 corresponding to the core wire, an insulator model m2 corresponding to the insulator, and a braided shield model m3 having a plurality of first wire bundle models m31 and a plurality of second wire bundle models m32 corresponding to a plurality of wire bundles. Specifically, the model creation unit 41 creates a simple braided shielded electric wire model M that includes a first layer L1 in which a plurality of first wire bundle models m31 are spirally formed along a first direction around the axis of the core wire model m1, and a second layer L2 that is provided outside the first layer L1 and spaced apart from the first layer L1, and in which a plurality of second wire bundle models m32 are spirally formed along a second direction opposite to the first direction around the axis of the core wire model m1, and in which the first wire bundle models m31 of the first layer L1 and the second wire bundle models m32 of the second layer L2 are not braided together.

[0036] With this configuration, the braided shielded electric wire simulation device 1 can simulate the contact resistance that occurs between the layers by separating the first layer L1 and the second layer L2 of the braided shield model m3, making it possible to create a simplified braided shielded electric wire model M that reproduces the spiral current flow in an actual braided shielded electric wire. Furthermore, the braided shielded electric wire simulation device 1 can create the simplified braided shielded electric wire model M by not interweaving the first wire bundle model m31 and the second wire bundle model m32. For example, the braided shielded electric wire simulation device 1 does not need to interweave multiple wire bundles to reproduce a fine mesh, as is conventionally done, and therefore can create a simplified braided shield model m3 and shorten the model creation time. As a result, the braided shielded electric wire simulation device 1 can properly model the braided shielded electric wire.

[0037] The braided shielded electric wire simulation device 1 further includes an input device 10 for inputting parameters. The model creation unit 41 creates a simple braided shielded electric wire model M by setting the parameters input to the input device 10 as the variables of the above-mentioned equations (1) to (12). With this configuration, the braided shielded electric wire simulation device 1 can easily create various types of simple braided shielded electric wire models M by setting the parameters.

[0038] A braided shielded electric wire simulation method as a method for modeling a braided shielded electric wire includes a model creation step S2 in which, when creating a simplified braided shielded electric wire model M that reproduces the current flowing through the braided shield of an actual braided shielded electric wire, the simplified braided shielded electric wire model M includes a core wire model m1 corresponding to the core wire, an insulator model m2 corresponding to the insulator, and a braided shield model m3 having a plurality of first wire bundle models m31 and a plurality of second wire bundle models m32 corresponding to a plurality of wire bundles. In the model creation step S2, a simplified braided shielded electric wire model M is created in which the first wire bundle model m31 of the first layer L1 and the second wire bundle model m32 of the second layer L2 are not braided. With this configuration, the braided shielded electric wire simulation method can appropriately model the braided shielded electric wire.

[0039] The braided shield wire simulation program as a braided shield wire modeling program is a program for causing a computer to execute a model creation step S2 in which, when creating a simplified braided shield wire model M that reproduces the current flowing through the braided shield of an actual braided shield wire, the simplified braided shield wire model M includes a core wire model m1 corresponding to the core wire, an insulator model m2 corresponding to the insulator, and a braided shield model m3 having a plurality of first wire bundle models m31 and a plurality of second wire bundle models m32 corresponding to a plurality of wire bundles. In the model creation step S2, a simplified braided shield wire model M is created in which the first wire bundle model m31 of the first layer L1 and the second wire bundle model m32 of the second layer L2 are not braided. With this configuration, the braided shield wire simulation program allows a computer to properly model the braided shield wire.

[0040] Note that, in the above description, an example has been described in which the simulation device 1 for a braided shielded electric wire creates the simplified braided shielded electric wire model M, but the present invention is not limited to this. For example, the simulation device 1 for a braided shielded electric wire may be configured to acquire the simplified braided shielded electric wire model M from an external modeling device for a braided shielded electric wire (not shown) instead of creating the simplified braided shielded electric wire model M. In this case, the external modeling device for a braided shielded electric wire stores in advance the formulas (1) to (12) for creating the simplified braided shielded electric wire model M, creates the simplified braided shielded electric wire model M by setting parameters for the variables of the formulas (1) to (12), and outputs the created simplified braided shielded electric wire model M to the simulation device 1 for a braided shielded electric wire. In other words, the external modeling device for a braided shielded electric wire does not have a function for analyzing the shielding characteristics of the braided shielded electric wire, but functions as a modeling-only device that creates the simplified braided shielded electric wire model M, and outputs the created simplified braided shielded electric wire model M to the outside.

[0041] Although the processing circuit 40 has been described as having each processing function realized by a single processor, this is not limited to this. The processing circuit 40 may also be configured as a combination of multiple independent processors, each of which executes a program to realize each processing function. Furthermore, the processing functions of the processing circuit 40 may be realized by distributing or integrating them as appropriate across a single or multiple processing circuits. Furthermore, all or any part of the processing functions of the processing circuit 40 may be realized by a program, or may be realized as hardware using wired logic or the like.

[0042] The program executed by the processor is provided by being pre-installed in the storage circuitry 30 or the like. The program may also be provided by being recorded on a computer-readable storage medium in a format that can be installed on these devices or in a format that can be executed. The program may also be provided or distributed by being stored on a computer connected to a network such as the Internet and downloaded via the network.

[0043] In the above description, an example has been described in which one stage each of the first wire bundle model m31 and the plurality of second wire bundle models m32 is provided, but this is not limitative, and by applying the above formula, multiple stages each of the first wire bundle model m31 and the plurality of second wire bundle models m32 may be provided. [Explanation of symbols]

[0044] 1. Braided shielded wire simulation device (braided shielded wire modeling device) 10 Input device (input section) 41 Model Creation Department M Simple braided shielded wire model m1 core model m2 insulator model m3 braided shield model m30 wire model m31 First wire bundle model m32 Second wire bundle model L1 1st layer L2 2nd layer S2 Model Creation Steps C center

Claims

1. a model creation unit that creates a simplified braided shielded electric wire model that reproduces a current flowing through the braided shield of a braided shielded electric wire that includes a conductive core wire, an insulator that covers the core wire, and a braided shield that is provided around the insulator and is formed by braiding each of a plurality of element wires into bundles, the model creation unit creates the simplified braided shield electric wire model including a core wire model corresponding to the core wire, an insulator model corresponding to the insulator, and a braided shield model having a plurality of first wire bundle models and a plurality of second wire bundle models corresponding to the plurality of wire bundles, the simplified braided shield electric wire model including: a first layer in which the plurality of first wire bundle models are spirally formed in a first direction around an axis of the core wire model; and a second layer provided outside the first layer and spaced apart from the first layer, in which the plurality of second wire bundle models are spirally formed in a second direction around the axis of the core wire model that is opposite to the first direction, and the simplified braided shield electric wire model created is one in which the first wire bundle model of the first layer and the second wire bundle model of the second layer are not braided.

2. further comprising an input unit for inputting parameters; The model creation unit creates the simplified braided shield electric wire model based on parameters input to the input unit, and the coordinates on a three-dimensional coordinate system are defined as x, y, and z, the diameter of the wire model corresponding to the wire is defined as r, the diameter of the insulator model is defined as R, the wire length of one turn around the axis of the wire model is defined as p, the number of the wire models constituting the first wire bundle model and the second wire bundle model is defined as n, the total number of bundles of the first wire bundle model and the second wire bundle model is defined as m, and the gap between the wire models around the axis is defined as g ｓ The radial gap between the wire models is g ｈ The predetermined value on the three-dimensional coordinate system is defined as t, and the distance from the center of the core model to the wire model of the second wire bundle model is defined as r １ The angle between adjacent wire models of the second wire bundle model is α １ The distance from the center of the core model to the wire model of the first wire bundle model is r ２ The angle between adjacent wire models of the first wire bundle model is α ２ 2. The braided shielded electric wire modeling device according to claim 1, which creates the simplified braided shielded electric wire model that satisfies the following expressions (1) to (12): [Equation 1] [Equation 2] [Equation 3] [Equation 4]

3. When creating a simplified braided shield electric wire model that reproduces a current flowing through the braided shield of a braided shield electric wire including a conductive core wire, an insulator covering the core wire, and a braided shield formed by braiding a plurality of wire bundles formed around the insulator and each of the wire bundles being formed by bundling a plurality of wires, the method includes a model creation step of creating the simplified braided shield electric wire model including: a core wire model corresponding to the core wire; an insulator model corresponding to the insulator; and a braided shield model having a plurality of first wire bundle models and a plurality of second wire bundle models corresponding to the plurality of wire bundles, the modeling method for a braided shielded electric wire, wherein the model creating step includes: a first layer in which the plurality of first wire bundle models are formed in a spiral shape along a first direction around the axis of the core wire model; and a second layer provided outside the first layer and spaced apart from the first layer, in which the plurality of second wire bundle models are formed in a spiral shape along a second direction around the axis of the core wire model that is opposite to the first direction, and the simplified braided shielded electric wire model is created in which the first wire bundle models of the first layer and the second wire bundle models of the second layer are not braided.

4. a program for causing a computer to execute a model creation step of creating a simplified braided shield electric wire model that reproduces a current flowing through the braided shield of a braided shield electric wire including a conductive core wire, an insulator covering the core wire, and a braided shield formed by braiding a plurality of wire bundles formed around the insulator and each of which is formed by bundling a plurality of wires, the simplified braided shield electric wire model including a core wire model corresponding to the core wire, an insulator model corresponding to the insulator, and a braided shield model having a plurality of first wire bundle models and a plurality of second wire bundle models corresponding to the plurality of wire bundles, the model creating step includes: a first layer in which the plurality of first wire bundle models are spirally formed along a first direction around the axis of the core wire model; and a second layer provided outside the first layer and spaced apart from the first layer, in which the plurality of second wire bundle models are spirally formed along a second direction around the axis of the core wire model that is opposite to the first direction; and the simplified braided shielded wire model is created in which the first wire bundle models of the first layer and the second wire bundle models of the second layer are not braided.

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