JP2009266775A - Bending-state visualizing method, bending-state visualization system, bending-state visualization program, cable-bending life estimation method, and cable-bending life estimation system for conductive wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a visualization system capable of visually understanding a bending state of a conductive wire forming a cable, and to provide a method and an estimation system capable of improving estimation accuracy of bending life of a cable. <P>SOLUTION: The bending-state visualization method comprises a structural parameter input step of making a computer accept input of structural parameters defining a stranded structure of conductive wires, a bending degree input step of making the computer accept input of bending degrees of the stranded cable, a straight-state calculation step of making the computer calculate a bending state of each conductive wire at the time of a straight state of the stranded cable on the basis of the inputted structural parameters, a bending-state calculation step of making the computer calculate the bending state of each conductive wire at the time of a bending state of the stranded cable from a bending state of each conductive wire at the time of a straight state of the stranded cable and a bending degree of the inputted stranded cable, and a step of generating and outputting images showing a bending state of each conductive wire at the time of a bending state of the stranded cable. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention visualizes the bent state of a plurality of twisted and bundled conductor wires constituting a twisted cable, and predicts the bending life of the twisted cable based on the bent state, and a method for visualizing the bent state of the conductor wire, The present invention relates to a bending state visualization system, a cable bending life prediction method, and a cable bending life prediction system.

Stranded cables for signal transmission and power supply are used in automobiles and industrial equipment. Such a twisted cable includes a twisted bundle of conductor wires made of a plurality of conductive metals, a twisted bundle of conductor wires, and a single twisted cable formed. is there.
Some of these stranded cables are routed in a bending movable part such as a door part of an automobile, and may be disconnected by repeatedly deforming as the bending movable part bends. For this reason, for example, the shape of the stranded wire cable in the longitudinal direction is modeled by the finite element method, etc., and the state at the time of deformation in the longitudinal direction, such as the bending or twisting state of the stranded wire cable in a specific case, is simulated. The life prediction of a wire cable and selection of the optimal stranded wire cable based on the prediction are performed (for example, refer patent document 1).

JP 2002-260460 A

In the above conventional example, even if it is a stranded cable composed of a plurality of conductor wires, it is assumed that the entire stranded wire cable is a single pipe, and this pipe is modeled and simulated to be bent. The method of calculating the curvature at the time of bending, etc. was adopted. This is because, conventionally, the bending life of a stranded cable has been considered to depend on the curvature of the entire stranded cable due to wiring or the like.
On the other hand, the disconnection of the stranded wire cable is actually caused by the disconnection due to bending fatigue of the plurality of conductor wires constituting the stranded wire cable. A plurality of conductor wires constituting a stranded cable are twisted and bundled to form a spiral structure. Since the conductor wire of this spiral structure is bent by bending of the stranded cable, the bending state is very complicated. It becomes. For this reason, when the entire stranded cable is modeled and simulated as a single pipe as in the above conventional example, the bending life of the entire stranded cable can be predicted with a certain degree of accuracy, but the conductor adopting a spiral structure Since the bending state of the line is not taken into consideration, it is difficult to predict a more accurate bending life.

  In addition, if it is possible to visually grasp how the conductor wire constituting the twisted cable in the bent state can be bent, useful information can be obtained in predicting a more accurate bending life and the like. be able to. However, in the simulation by the finite element method of the above-mentioned conventional example, the twisted cable is modeled as one pipe under the assumption that the bending life of the twisted cable depends on the curvature of the entire twisted cable. There is no analysis of the individual conductor wires that make up the cable. In addition, since the conductor wire constituting the stranded cable is covered with an external coating or the like, it is grasped by visually observing the actual thing from the outside how the conductor wire of the stranded wire cable in the bent state is bent. It is also difficult.

  As described above, the bending life of the stranded cable has been considered to depend on the bending of the entire stranded cable. Therefore, in predicting the bending life of the stranded cable, the bending state of the conductor wire can be grasped visually. Or simulating a twisted cable taking into account the bending state of a conductor wire having a spiral structure, there is still room for predicting the bending life more accurately. . Therefore, as a means for predicting the bending life more accurately, a method for visually grasping the bending state of the conductor wire when the twisted cable is bent, and the bending of the conductor wire adopting a spiral structure A method for predicting the bending life of a stranded cable in consideration of the state has been desired.

  The present invention has been made in view of such circumstances, and a bending state visualization method of a conductor wire, and a bending state visualization capable of visually grasping the bending state of the conductor wire of a twisted cable in a bent state. It is an object of the present invention to provide a system, and a cable bending life prediction method and a cable bending life prediction system that can further increase the accuracy of predicting the bending life of a stranded cable.

  The present invention is a method for visualizing the bending state of a conductor wire, wherein the bending state of the conductor wire when bending a twisted cable in which a plurality of conductor wires are twisted and bundled is calculated and visualized by a computer, Based on the structural parameter input step in which the computer receives the input of the structural parameters for determining the twisted structure of the conductor wire, the bending degree input step in which the computer receives the input of the bending degree of the stranded wire cable, A straight line state calculation step in which a computer calculates a bent state of each conductor wire when the twisted wire cable is in a straight state, and a bent state of each conductor wire when the twisted wire cable is in a bent state. From the bending state of each conductor wire when the cable is in a straight state and the bending degree of the input stranded cable, Computer is characterized by including a bending state calculating step of calculating, and an output step for generating and outputting an image showing a bent state of each conductor line when the bent state the stranded cables.

  According to the method for visualizing the bending state of the conductor wire configured as described above, the bending state calculation step calculates the bending state of each conductor wire when the stranded wire cable is in the bending state, and the output step calculates the twist. Since the image showing the bending state of each conductor wire when the wire cable is in the bent state is generated and output, the bending state of each conductor wire can be visualized. As a result, it is possible to visually grasp the bent state of the conductor wire in the twisted cable in the bent state, and it is possible to more accurately grasp the bent state of the conductor wire.

Further, the bending state visualization method of the conductor wire, a curvature calculation step of approximately calculating the curvature of each of the conductor lines based on the bending state of each of the conductor wires calculated by the bending state calculation step, And a curvature output step of outputting the curvature of each conductor wire obtained by the curvature calculation step.
In this case, in addition to the image showing the bent state of the conductor wire, the curvature output step outputs the curvature of the conductor wire, so that the conductor wire of the stranded wire cable in the bent state can be bent by referring to each other. The state can be grasped from various angles.

  Also, in the method for visualizing the bent state of the conductor wire, the straight line state calculating step is such that the three orthogonal directions are X, Y, Z, the longitudinal direction of the stranded cable is parallel to the Y direction, A straight line state coordinate value, which is a coordinate value of a plurality of cross-section center points arranged along the center line passing through the center line of the conductor wire in the longitudinal direction, is a bending of each conductor wire when the stranded cable is in a straight line state. The bending state calculation step calculates the bending state coordinate value that is the coordinate value of the cross-sectional center point when the bending center is parallel to the Z direction and the bending wire is bent. And calculating the bending state of each conductor wire when in the state, and the output step connects the cross-sectional center points of the respective conductor wires based on the bending state coordinate values of the cross-sectional center points. It may be configured to generate a diagram output.

In this case, the bending state calculation step can calculate the bending state coordinate value of the cross-sectional center point of the conductor wire when the stranded cable is in the bent state, and generate and output a diagram connecting the cross-sectional center points. Therefore, the bending state of each conductor wire can be easily visualized.
In this case, the bending state calculation step calculates the bending state of each conductor wire of the stranded wire cable in a bent state in which the longitudinal direction of the stranded wire is parallel to the Y direction and the bending center is parallel to the Z direction. Therefore, it is not necessary to calculate the Z coordinate among the linear state coordinate values, and the bending state coordinate value can be obtained by calculating only the X coordinate and the Y coordinate. Therefore, the calculation for obtaining the bent state coordinate value can be performed easily and quickly.

In addition, the bending degree is a radius of curvature, and the bending state calculating step specifically calculates the linear state coordinate value of the cross-sectional center point based on the following formulas (1) to (3). Can be converted to a value.
x ′ = R− (R−x) × cos (y / R) (1)
y ′ = (R−x) × sin (y / R) (2)
z '= z (3)
However, R is a radius of curvature, (x, y, z) is a linear state coordinate value, and (x ′, y ′, z ′) is a bent state coordinate value.

Further, the curvature calculating step specifies three points arranged in the longitudinal direction of the conductor line among the center points of the cross section, and sequentially uses at least the curvature of the arc passing through these three points as an approximate curvature of the conductor line. It may be calculated.
In this case, the curvature of the arc passing through the three points can be easily calculated by the sine theorem.

  The structural parameters may include a conductor wire twisting method, the number of conductor wires, a conductor wire diameter (either a radius or a diameter), and a twist pitch.

  Further, the present invention is a method for visualizing the bending state of a conductor wire, wherein a bending state of the conductor wire when a twisted cable in which a plurality of conductor wires are twisted and bundled is bent is calculated and visualized by a computer. Based on the input structural parameters, a structural parameter input step in which a computer accepts input of structural parameters for determining the twisted structure of the conductor wire, a flexure degree input step in which the computer accepts an input of the flexibility of the stranded wire cable Then, the computer calculates the bending state of each conductor wire when the twisted cable is in a straight state, and by adding a predetermined value to the bending degree, the twisted cable is in a straight state. A bending degree displacement step of displacing the bending degree in the approaching direction, and each conductor wire when the stranded wire cable is in a bent state The bending state is calculated by a bending state calculation step calculated by a computer from the bending state of each conductor wire when the stranded cable is in a straight state and the bending degree of the stranded wire cable, and the bending state calculation step. Based on the bending state of each conductor wire, a curvature calculation step of approximately calculating the curvature of each conductor wire, and until the bending degree is a value that can approximate the stranded wire cable to a linear state, Before repeating the bending degree displacement step, the bending state calculation step, and the curvature calculation step, and the curvature calculated after the bending degree displacement step displaces the bending degree, and immediately before the bending degree is displaced. Curvature difference integration step of integrating the curvature difference that is the difference from the calculated curvature, and the curvature difference integration value that is obtained by the curvature difference integration step and that outputs the integration value of the curvature difference It is characterized in that it comprises a force step.

  The curvature difference integrating step includes a curvature calculated after displacing the bending degree by a predetermined value until the bending degree becomes a value that can approximate the stranded cable to a linear state, and immediately before displacing the bending degree. The difference in curvature, which is the difference from the calculated curvature, is integrated. Thus, the obtained integrated value is the curvature displacement in the conductor wire when the stranded cable in the straight state is bent at the bending degree input in the bending degree input step. According to the present invention, The curvature displacement can be obtained along a path when the stranded cable in a bent state with a predetermined radius of curvature becomes a straight state. As a result, even if the conductor wire is twisted and bundled and is in a complicated bending state, the curvature displacement can be accurately obtained. Then, by outputting the calculated curvature displacement by the curvature difference integrated value output step, the bending state of the conductor wire of the stranded cable in the bent state can be grasped based on this curvature displacement.

  Further, the present invention provides a cable bend that predicts a bending life of the stranded wire cable by calculating a bending state of the stranded wire when a stranded wire cable in which a plurality of conductor wires are twisted and bundled is bent. It is a life prediction method, and a structure parameter input step in which a computer receives an input of a structure parameter that defines a twisted structure of the conductor wire, and a bending degree input step in which a computer receives an input of the bending degree of the stranded wire cable are input. Further, based on the structural parameters, a computer calculates a bending state of each conductor wire when the twisted cable is in a straight state, and adding a predetermined value to the bending degree, the twisting A bending degree displacement step of displacing the bending degree in a direction in which the wire cable approaches a linear state, and bending the stranded cable Bending state calculation step in which the computer calculates the bending state of each conductor wire when the twisted cable is in a straight line, the bending state of each conductor wire when the twisted cable is in a straight state, and the bending degree of the twisted cable A curvature calculation step of approximately calculating the curvature of each conductor wire based on the bending state of each conductor wire calculated by the bending state calculation step, and the bending degree of the stranded wire cable in a straight line state The curvature displacement step, the bending state calculation step, and the curvature calculation step are repeated until the value can be approximated, and the curvature calculated after the bending degree displacement step displaces the curvature. A curvature difference integration step of integrating a curvature difference that is a difference from the curvature calculated immediately before displacing the bending degree, and the curvature difference of each conductor wire obtained by the curvature difference integration step Of obtains the maximum value of the accumulated value, on the basis of the maximum value, is characterized in that it comprises a and a life expectancy calculation step of calculating the bending life of the stranded cables to be predicted.

In the bending life prediction method configured as described above, the curvature difference integrating step can accurately calculate the curvature displacement even when the conductor wires are twisted and bundled and are in a complicated bending state as described above.
Furthermore, since the bending life of the stranded wire cable is calculated based on the curvature displacement of the conductor wire in the predicted life calculating step, the bending life of the stranded wire cable can be predicted in consideration of the bending state of each conductor wire. . As a result, the prediction accuracy of the calculated bending life of the stranded cable can be further increased.

  The present invention is a conductor wire bending state visualization system for calculating and visualizing a bending state of the conductor wire when a stranded cable in which a plurality of conductor wires are twisted and bundled is bent by the computer, Based on the structural parameter input unit that accepts the input of the structural parameters that determine the twisted structure of the conductor wire, the bending degree input unit that accepts the input of the bending degree of the stranded wire cable, and the inputted structural parameters A straight state calculation unit that a computer calculates a bent state of each conductor wire when the twisted cable is in a straight state, and a bent state of each conductor wire when the twisted cable is in a bent state, From the bent state of each conductor wire when the cable is in a straight state and the bending degree of the input stranded cable, Computer is characterized by including a bent state calculating section for calculating, and an output unit for generating and outputting an image showing a bent state of each conductor line when the bent state the stranded cables.

  According to the bending state visualization system of the conductor wire configured as described above, it is possible to visually grasp the bending state of the conductor wire in the twisted cable in the bent state, as described above. The bending state can be grasped more accurately.

  Further, the present invention provides a cable bend that predicts a bending life of the stranded wire cable by calculating a bending state of the stranded wire when a stranded wire cable in which a plurality of conductor wires are twisted and bundled is bent. A life prediction system, wherein a computer receives an input of a structure parameter that defines a twist structure of the conductor wire, and a bend degree input unit that a computer receives an input of a bend degree of the twisted cable. Further, based on the structural parameters, a computer calculates a bending state of each conductor wire when the stranded wire cable is in a straight state, and a predetermined value is added to the bending degree, whereby the twisting A bending degree displacement portion for displacing the bending degree in a direction in which the wire cable approaches a linear state, and the twisted cable is bent. Bending state calculation unit that the computer calculates from the bending state of each conductor wire when the stranded wire cable is in a straight state and the bending degree of the stranded wire cable, Based on the bending state of each conductor wire calculated by the bending state calculation unit, a curvature calculating unit that approximately calculates the curvature of each conductor wire, and the bending degree approximates the stranded wire cable to a straight state A curvature calculated after the bending degree displacement unit displaces the bending degree, while repeating the calculation by the bending degree displacement unit, the bending state calculation unit, and the curvature calculation unit until a possible value is obtained. A curvature difference integrating unit that integrates a curvature difference that is a difference from the curvature calculated immediately before displacing the bending degree, and an integrated value of the curvature difference of each conductor wire obtained by the curvature difference integrating unit. Of obtains the maximum value, based on this maximum value, it is characterized in that it comprises a and a life expectancy calculation unit for calculating a bending life of the stranded cables to be predicted.

  According to the cable bending life prediction system configured as described above, it is possible to predict the bending life of the stranded wire cable in consideration of the bending state of each conductor wire as described above. As a result, the prediction accuracy of the calculated bending life of the stranded cable can be further increased.

  Further, the present invention is a conductor wire bending state visualization program for calculating and visualizing a bending state of the conductor wire when a twisted cable in which a plurality of conductor wires are twisted and bundled is bent by a computer. The computer receives a structural parameter input step for accepting an input of a structural parameter for determining a twisted structure of the conductor wire, a bend degree input step for accepting an input of a bend degree of the stranded wire cable, and the inputted structure Based on parameters, the computer calculates the bending state of each conductor wire when the stranded cable is in a straight state, and the bending state of each conductor wire when the stranded cable is in a bent state The bending state of each conductor wire when the stranded wire cable is in a straight state, and the input A bending state calculation step calculated by a computer based on the bending degree of the stranded wire cable, and an output step of generating and outputting an image showing a bending state of each conductor wire when the stranded wire cable is in a bending state And a program for executing the above.

  According to the conductor wire bending state visualization program configured as described above, it becomes possible to visually grasp the bending state of the conductor wire in the twisted cable in the bent state, as described above. The bending state can be grasped more accurately.

As described above, according to the bending state visualization method, the bending state visualization system, and the bending state visualization program according to the present invention, the bending state of the conductor line in the twisted cable in the bent state is visually grasped. be able to.
In addition, according to the cable bending life prediction method and the cable bending life prediction system according to the present invention, it is possible to further improve the prediction accuracy of the bending life of the stranded wire cable by considering the bending state of the conductor wire having a spiral structure. Can do.

[Configuration of an apparatus for realizing the method of the present invention]
Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing a bending life prediction system for predicting the bending life of a stranded cable or the like. This bending life prediction system 10 is a system for performing a bending state visualization method of a conductor wire in a twisted cable in a bending state and a cable bending life prediction method according to an embodiment of the present invention. It is configured by a computer or the like in which a program for realizing the bending state visualization and the prediction of the cable bending life is installed.
As shown in FIG. 1, the bending life prediction system 10 includes an input device 11 composed of a keyboard and a mouse, an output device 12 composed of a display, a printer, and the like, and a storage unit 13 composed of a hard disk for storing various information. And a data processing unit 20 that performs processing for predicting the bending life of the stranded cable based on various data input by the input / output devices 11 and 12.

The input / output devices 11 and 12 receive structural parameters, which are information for determining the structure of the stranded cable for which the flex life is to be predicted, and output the calculation results by the data processing unit 20. Here, as will be described in detail later, the stranded cable that is a target for predicting the bending life is constituted by a plurality of conductor wires being twisted and bundled and the plurality of conductor wires having a spiral structure. The structural parameters include the twisting method of the conductor wire, the diameter and number of conductor wires, and the like.
The data processing unit 20 includes a coordinate value calculation unit 21, a conversion unit 22, a diagram generation unit 23, a curvature calculation unit as a functional unit group for visualizing the bending state of the conductor wire and predicting the bending life of the stranded cable. 24, a predicted life calculation unit 26, and a control unit 27.
The coordinate value calculation unit 21, the conversion unit 22, and the diagram generation unit 23 are a plurality of conductors constituting the stranded wire cable based on information on the structure of the stranded wire cable input to the input / output devices 11 and 12. An operation is performed to represent the bent state of the line as a diagram showing the center line of the conductor line. By outputting a diagram showing the calculated center line of the conductor line by the output device 12, the bending state of the conductor line is visualized. That is, the bent state of the conductor wire refers to the bent shape of the conductor wire, numerical data indicating the same, and the like.
The curvature calculating unit 24 calculates the curvature of the conductor wire based on the numerical data of the bending state of the conductor wire calculated as described above.

The control unit 27 comprehensively controls each functional unit of the data processing unit 20 and, based on the curvature calculated by the curvature calculation unit 24, from a straight state where the stranded wire cable is not bent to a predetermined bent state It has a function of calculating the difference in curvature of the conductor wire in accordance with the displacement of the radius of curvature when bent until it becomes, and integrating the difference in curvature of the conductor wire.
The predicted life calculation unit 26 is obtained by accumulating the difference in curvature calculated by the control unit 27, from the curvature displacement when the stranded wire cable is bent until it reaches a predetermined bent state. Then, the bending strain of the conductor wire is obtained, and the predicted bending life is calculated.
In addition, the data processing unit 20 functionally includes a counter 28 that is necessary when performing calculations in the functional unit.
Note that more specific processing contents performed by each of the functional units will be described in detail later.

[Structure of stranded cable predicting bending life]
FIG. 2 is a diagram showing the structure of a stranded cable that is a target for visualizing the bending state of the conductor wire and predicting the bending life of the stranded wire cable by the system 10, and FIG. The perspective view which shows a structure, (b) is sectional drawing.
In FIG. 2, a stranded cable 30 has a plurality of conductor wires 31 spirally bundled therein and an outer covering 32 that covers the outer peripheral side thereof. In the figure, a stranded cable 30 having six conductor wires 31 is shown. Each conductor wire 31 is composed of a wire 31a made of a conductive metal wire such as a copper wire and a covering layer 31b made of an insulator covering the outer peripheral side, and functions as a transmission path for signals, power, and the like. In addition, the stranded cable 30 is configured by a so-called layer twist method, which is a spiral structure in which all the conductor wires 31 are uniformly twisted and bundled.

  3 (a) and 3 (b) are diagrams showing the structure of another stranded cable that is also subject to processing by the system 10, and a stranded cable having a structure different from that of the stranded cable 30 of FIG. Is shown. The stranded wire cable 30 shown in FIG. 3 forms several sets of wire bodies (paired stranded wires 33) by twisting and twisting two of the plurality of conductor wires 31 in a spiral manner. The twisted wire 33 is further twisted and bundled in a spiral shape to form a single twisted cable, which is a so-called twisted pair system. In the stranded cable 30 of FIG. 3, four pairs of stranded wires 33 are formed from the eight conductor wires 31, and these four pairs of stranded wires 33 are spirally bundled to form a pair-twist method. Has been.

The system 10 can perform processing on two types of stranded cable, the above-described layer twist method and the pair twist method.
In the twisted cable 30 having the two types of structures described above, as a structural parameter for specifically determining the twisted structure of the conductor wire 31, in addition to the twisting method (layer twisting or pair twisting) of the conductor wire 31, the conductor wire 31 has a radius q1, a number n of conductor wires 31, and a twist pitch L, and these structural parameters are input to the input / output devices 11 and 12 of the system, so that the system 10 is a target of processing. A specific structure of the conductor wire 31 in the stranded cable 30 can be determined.
In addition, the twist pitch in the case where the twisting method of the twisted cable 30 is a twisted pair includes a twisted pair pitch TL in each paired twisted wire 33 and a collective twisted pitch SL when twisting and bundling a plurality of paired twisted wires 33, When a twisted cable of a twisted pair type is an object, it is necessary to input all of them. Further, in the case of the twisted pair method, in addition to the radius q1 of the conductor wire 31, it is necessary to input the pitch circle radius q2 of the twisted wire 33 from the center of the twisted cable 30 to the center of the twisted wire 33. Thus, the specific structure of the stranded cable can be determined.

[How to visualize the bending state of conductor wires]
Next, specific modes of the method for visualizing the bending state of the conductor wire and the method for predicting the bending life of the stranded cable performed by the bending life prediction system 10 having the above-described configuration will be described.
4 and 5 are flowcharts showing specific processes performed by the system 10. In addition, these flowcharts are continuing with A in the figure.
Referring to FIG. 4, in the present system 10, the input / output devices 11 and 12 are input with the above-described structural parameters that determine the twisted structure of the conductor wire 31 that constitutes the twisted cable 30 to be processed ( In step S101), when the radius of curvature R as the degree of bending when the stranded cable to be processed is virtually bent in a later process is input (step S102), the control unit 27 of the data processing unit 20 inputs The structural parameters and the like are temporarily stored in the storage unit 13 or the like. Then, the count value C of the counter 28 is set to “1” (step S103), and the process proceeds to step S104.

FIG. 6A shows an example of a display for accepting a structural parameter in step S101. This display is for processing a layer-twisted stranded cable, and the control unit 27 includes, as structural parameters, the radius q1 of the conductor wire 31, the number n of conductor wires, and the twist pitch L (see FIG. 3). ) Is displayed. In addition, an input frame for inputting the radius of curvature R when virtually bending the stranded cable to be processed, which is input in step S102, is also displayed.
An operator of the system 10 inputs a numerical value for each piece of information by operating a keyboard or the like after moving the cursor to the input frame 40 to be input with a mouse or the like. The control unit 27 receives each numerical value input to the input frame 40 as a numerical value of each corresponding parameter, and temporarily stores it in the storage unit 13 or the like.

  FIG.6 (b) is an example of the display display for receiving the structural parameter in the case of processing the twisted-wire cable of a twist method. This display is intended for a twisted pair cable with eight conductor wires 31. In addition to the radius of curvature R and the conductor wire radius q1, the above-described collective twist pitch SL and twisted twist pitch are used. Input frames 41 for the pitch circle radii q <b> 2 of the TLs 1 to 4 and the twisted wires 33 are provided.

The control unit 27 of the data processing unit 20 displays the display shown in FIGS. 6A and 6B at the same time and displays the display to the operator according to the structure of the stranded cable 30 to be processed. By selectively inputting, it is possible to determine whether the structure of the twisted cable 30 to be processed is a layer twist method or a pair twist method. For example, the twisted cable structure to be processed is a layer. When the screen for allowing the operator to select whether twisting or twisting is displayed and the operator selects one of the screens, the control unit 27 displays both displays shown in FIGS. 6 (a) and 6 (b). Of these, it is also possible to configure to perform display according to the selection of the operator.
As described above, this step S101 constitutes a structural parameter input step for inputting a structural parameter for determining the twisted structure of the conductor wire 31 of the twisted cable 30 to be processed, and step S102 is a curvature of the twisted cable 30. A curvature radius input step for inputting the radius R is configured. The input / output devices 11 and 12 constitute a structural parameter input unit and a bending degree input unit that realize both the processes.
In the following description, a case will be described in which the layered twisted cable 30 (number of conductor wires n = 6) shown in FIG.

Returning to FIG. 4, in step S <b> 104, the control unit 27 has a plurality of cross sections arranged along the center line passing through the center of the cross section of the conductor wire 31 in the longitudinal direction in a straight state where the stranded cable 30 is not bent. The coordinate value calculation unit 21 is caused to calculate the three-dimensional coordinate value of the center point.
That is, the coordinate value calculation unit 21 determines any one of the six conductor lines 31 as the first conductor line 31 and sequentially applies the remaining five conductor lines 31 to the second to sixth. The second conductor wire 31 is defined. Then, when the stranded cable 30 is in a straight line state so that the three orthogonal directions are X, Y, Z and the stranded cable longitudinal direction is parallel to the Y direction, the cross-sectional center of the C-th conductor wire 31 is A linear state coordinate value, which is a three-dimensional coordinate value of a plurality of cross-sectional center points arranged at a predetermined pitch along the center line passing in the longitudinal direction, is calculated based on the structure parameter. Here, since the count value C is “1”, the coordinate value of the cross-sectional center point of the first conductor wire 31 is calculated.
At this time, the numerical value range of the Y coordinate value in the longitudinal direction of the stranded cable parallel to the Y direction is appropriately set by the coordinate value calculation unit 21 in accordance with the numerical value of the structural parameter.

Next, the control unit 27 determines whether or not the count value C of the counter 28 is greater than or equal to the number n (= 6) of conductor wires (step S105). When the count value C is equal to or greater than the number n of conductor wires, the process proceeds to step S107.
On the other hand, when the count value C is smaller than the number n of the conductor wires 31, the process proceeds to step S106, and the control unit 27 adds “1” to the count value C of the counter 28 and returns to step S104. Here, since the count value C is set to “1” in step S103, the count value C is set to “2”.
The control unit 27 causes the coordinate value calculation unit 21 to calculate the linear state coordinate value of the cross-sectional center point for the second conductor wire 31 (step S104).
As described above, the coordinate value calculation unit 21 sequentially repeats the calculation of the linear state coordinate value of the cross-sectional center point of each conductor line 31, and at the stage of calculating the linear state coordinate value of the sixth conductor line 31, Since the count value C of the counter 28 is set to “6”, the process proceeds to step S107.
In this way, step S104 is repeated for the number of conductor lines 31, and the linear state coordinate values of the cross-sectional center points for all the conductor lines 31 are calculated. The straight line state coordinate values calculated here are all stored in the storage unit 13.

FIG. 7 is a diagram showing an aspect of data of the calculation result of the linear state coordinate value of the cross-sectional center point for the conductor line 31 calculated in step S104.
In the figure, calculation result data for only the first conductor line 31 is shown, but similar calculation result data is also generated for the other second to sixth conductor lines 31.
As shown in FIG. 7, an identification number for identifying each point is assigned to each cross-sectional center point. The straight line state coordinate value as the calculation result is stored in association with each cross-sectional center point. Further, the coordinate value of the bending state of the cross-sectional center point, the curvature corresponding to each point, and the curvature displacement calculated in the subsequent process are stored in association with each point.
That is, these steps S104 to S106 are a plurality of linear state coordinate values of the center point of the cross section, which is data indicating the bending state of each conductor wire 31 when the stranded cable 30 is in a straight line state, based on the structural parameters. A straight line state calculating step for calculating each of the conductor wires 31 is configured. Moreover, the coordinate value calculation part 21 which implement | achieves this comprises the linear state calculation part.

Returning to FIG. 4, when the control unit 27 proceeds to step S <b> 107, based on the linear state coordinate value of the cross-sectional center point of each conductor line 31, the control unit 27 displays a line diagram connecting the cross-sectional center points of each conductor line 31. The figure is generated by the figure generator 23 and output to the display.
FIG. 8A is a diagram two-dimensionally showing a diagram connecting the cross-section center points based on the linear state coordinate values. In the figure, the horizontal axis represents the coordinate value in the Y direction, and the vertical axis represents the coordinate value in the X direction.
As illustrated, diagrams a to f are output corresponding to the first to sixth conductor lines 31, respectively. In the figure, each conductor wire 31 is twisted and bundled to take a spiral structure, and the entire stranded wire cable 30 is in a straight line state.

Returning to FIG. 4, the control unit 27 proceeds to step S <b> 108, and based on the linear state coordinate value of the cross-sectional center point of each conductor wire 31, the twisted cable 30 when the twisted cable 30 is bent at the curvature radius R described above. The conversion unit 22 is caused to calculate a bending state coordinate value that is a coordinate value of the cross-sectional center point that moves in accordance with the bending.
That is, the converting unit 22 sets the bending state coordinate value of the center point of the cross section that moves according to the bending of the stranded cable 30 when the bending center is parallel to the Z direction and is bent at the curvature radius R as described above. Calculation is performed for each of the first to sixth conductor lines 31 based on the linear state coordinate value of the cross-sectional center point calculated in S104.

  In this case, the linear state coordinate value of the center point of the cross section when the longitudinal direction of the stranded cable 30 is parallel to the Y direction corresponds to the stranded cable in the bent state with the bending center parallel to the Z direction. Since it is converted to the bending state coordinate value of the cross-sectional center point, it is not necessary to convert and calculate the Z coordinate among the straight state coordinate values of the cross-sectional center point. Can be obtained. Therefore, the calculation for obtaining the bent state coordinate value can be performed easily and quickly.

Specifically, based on the following formulas (1) to (3), the linear state coordinate value of the cross-sectional center point can be converted into a bent state coordinate value.
x ′ = R− (R−x) × cos (y / R) (1)
y ′ = (R−x) × sin (y / R) (2)
z '= z (3)
However, R is a radius of curvature, (x, y, z) is a linear state coordinate value, and (x ′, y ′, z ′) is a bent state coordinate value.

The bending state coordinate value for each conductor wire 31 calculated by the conversion unit 22 is stored in the storage unit 13 in association with each cross-sectional center point, as shown in FIG.
As described above, in step S108, the bending state coordinate value, which is data indicating the bending state of each conductor wire 31 when the stranded cable 30 is in the bending state, is determined based on the linear state coordinate value of the cross-sectional center point. The bending state calculation process which calculates about each conductor wire 31 is comprised. Moreover, the conversion part 22 which implement | achieves this comprises the bending state calculating part.

Next, the control unit 27 proceeds to step S109, and based on the bending state coordinate value of the cross-sectional center point of each conductor line 31, a diagram that connects the cross-sectional center points of each conductor line 31 is displayed on the diagram generating unit 23. And output to a display or the like which is the output device 12.
FIG. 8B is a diagram two-dimensionally showing a diagram connecting the cross-section center points based on the bending state coordinate values. In the figure, the horizontal axis represents the coordinate value in the Y direction, and the vertical axis represents the coordinate value in the X direction.
In the figure, each of the diagrams a to f is output corresponding to each of the first to sixth conductor lines 31 as in FIG. Each conductor wire 31 is shown in a bent state as a whole of the stranded wire cable 30 while being twisted and bundled to take a spiral structure.
Further, these diagrams a to f can also be shown three-dimensionally, for example, as shown in FIG. FIG. 9 shows a display mode that can be displayed three-dimensionally in three orthogonal directions of X, Y, and Z, and the diagrams a to f are based on the bending state coordinate values of the cross-sectional center points. The display method can be changed as shown in the figure.
As described above, in step S109, a diagram connecting the cross-sectional center points as an image showing the bent state of each conductor wire 31 when the twisted cable 30 is in a bent state is used as the bent state coordinates of the cross-sectional center point. An output process of generating and outputting based on the value is configured. Further, the diagram generation unit 23 and the output device 12 that realize this constitute an output unit.

Thus, according to the present system 10, the conductor wire 31 can be visualized by calculating the bent state of the conductor wire 31 constituting the twisted cable 30 in the bent state and outputting it to a display or the like. it can.
That is, according to the bending state visualization method of the conductor wire 31 realized by the system 10, the bending state calculation step calculates the bending state of each conductor wire 31 when the stranded wire cable is in the bending state. Since the diagram connecting the cross-sectional center points can be generated and output in S109, the bending state of each conductor line 31 can be visualized. As a result, the bent state of the conductor wire 31 in the twisted cable 30 in the bent state can be visually grasped, and the bent state of the conductor wire 31 can be grasped more accurately.

[About curvature]
Next, the control unit 27 calculates the curvature K of the conductor wire 31 at each cross-sectional center point from the bending state coordinate value of the cross-sectional center point of each conductor wire 31 calculated in the above steps. Hereinafter, a method for calculating the curvature K will be described.
When the control unit 27 causes the diagram generation unit 23 to output the above-described diagram in step S109, the control unit 27 sets the count value C of the counter 28 to “1” (step S110).
Thereafter, the control unit 27 causes the curvature calculation unit 24 to calculate the curvature of the conductor wire 31 (step S111). The curvature calculation unit 24 specifies three points arranged in the longitudinal direction of the conductor line 31 among the cross-sectional center points of the C-th conductor line 31, and calculates the curvature of the arc passing through these three points at the conductor line at that point. An approximate curvature K of 31 is calculated.
Here, since the count value C is “1”, the curvature calculator 24 calculates the curvature of the first conductor wire 31.

FIG. 10 is a diagram illustrating an aspect when the curvature of the conductor line 31 is obtained from three cross-section center points arranged in the longitudinal direction among the cross-section center points of one conductor line 31. In the figure, the s-1th cross-sectional center point A _s-1 , the sth cross-sectional center point A _s , and the s + 1-th cross-sectional center point A _{s + 1} are arranged adjacent to each other in the longitudinal direction of the conductor line 31. It is out.
In this case, the straight line V between the cross-sectional center point A _s-1 and the cross-sectional center point A _s, a, and the angle formed by straight line W between the cross-sectional center point A _s and the cross-sectional center point A _{s + 1} theta, If the length of the straight line U between the cross _- section center point A _s-1 and the cross _- section center point A _s-1 is known, the radius of curvature R of the arc through which these three points pass can be obtained by the sine theorem. . Curvature calculating unit 24, as described above, it calculates the radius of curvature R in the cross-sectional center point A _s, based on two cross-sectional center point adjacent to the cross-sectional center point A _s.
In this way, the curvature calculation unit 24 calculates the curvature radius R at each cross-section center point of the conductor wire 31 and further calculates the reciprocal thereof to obtain the curvature K at each cross-section center point.

When the curvature of the first conductor wire 31 is calculated in step S111, the control unit 27 proceeds to step S112, and determines whether the count value C of the counter 28 is equal to or greater than the number n (= 6) of conductor wires. to decide. When the count value C is equal to or greater than the number n of conductor wires, the process proceeds to step S114.
On the other hand, when the count value C is smaller than the number n of the conductor wires 31, the process proceeds to step S113, and the control unit 27 adds “1” to the count value C of the counter 28 and returns to step S111. Here, since the count value C is set to “1” in step S110, the count value C is set to “2”. The control unit 27 causes the curvature calculation unit 24 to calculate the curvature K at each cross-section center point for the second conductor wire 31 (step S111).

As described above, the curvature calculation unit 24 sequentially repeats the calculation of the curvature K at the center point of each cross section of each conductor line 31, and the count value C of the counter 28 is calculated at the stage of calculation for the sixth conductor line 31. Is set to “6”, the process proceeds to step S114.
In this way, step S111 is repeated for the number of conductor lines 31, and the curvature K at each cross-section center point for each of the conductor lines 31 is calculated. The curvature K calculated here is stored in the storage unit 13 in association with each cross-sectional center point of each conductor wire 31 as shown in FIG.
As described above, steps S111 to S113 constitute a curvature calculation step of approximately calculating the curvature of each conductor wire 31 based on the bending state coordinate value that is data indicating the bending state of each conductor wire 31. Yes.

Next, in step S114, the control unit 27 graphs the curvature K at each cross-sectional center point of the first to sixth conductor lines 31 as a curvature distribution, and outputs it to a display or the like (curvature output step).
FIG. 11A is a diagram illustrating an example in which the curvature calculated by the curvature calculation unit 24 is graphed as a curvature distribution. In the figure, the horizontal axis is the axial distance along the longitudinal direction of the stranded cable 30 and is the coordinate value in the Y direction. The vertical axis shows the numerical value of the curvature K. Each of the diagrams a1 to f1 shown in the drawing corresponds to the first to sixth conductor lines 31, respectively. Therefore, it corresponds to the diagrams a to f in FIG.
Thus, by graphing the distribution of the curvature K, it is possible to easily grasp which part of which conductor wire 31 has the larger curvature K visually.
For this reason, according to the visualization method of the bending state by this system 10 or this system 10, each of the twisted cable 30 other than the diagrams a to f showing the bending state of the conductor wire 31 shown in FIG. Since the curvature distribution of the conductor wire 31 is displayed, the bending state of the conductor wire 31 of the twisted cable 30 in a bent state can be grasped from various angles by referring to both.

[About curvature displacement]
Next, the control unit 27 calculates the bending state coordinate value of the center point of the cross section of each conductor wire 31 constituting the stranded wire cable 30 in the bent state with the curvature radius R calculated in the above steps. The curvature displacement ΔK is calculated. Hereinafter, a method for calculating the curvature displacement ΔK will be described.
4 and 5, when the distribution of curvature K at each cross-sectional center point of each conductor line 31 is output in step S114, control unit 27 proceeds to step S201 in FIG. The operator is requested to input an increment value P of the required radius of curvature R. When the increment value P is input (step S201), the control unit 27 sets the count value C of the counter 28 to “1” (step S202).
Next, the control unit 27 sets “integrated value of curvature difference δK”, which is a value used in the following steps, to “0” (step S203), and proceeds to step S204.
In step S204, the control unit 27 adds the increment value P obtained in step S201 to the current curvature radius R. That is, in this step S204, the curvature radius R is increased by adding the increment value P to the current curvature radius R. For this reason, the control unit 27 displaces the bending radius R in a direction approaching a linear state, and this step S204 adds the increment value P as a predetermined value to the curvature radius R as the bending degree, thereby adding a curvature radius. A bending degree displacement step of displacing R in a direction approaching a linear state is configured. Moreover, the control part 27 which implement | achieves this comprises a bending degree displacement part.

Next, the control unit 27 determines the center point of each cross section of the C-th conductor wire 31 according to the bending of the stranded wire cable 30 when the twisted cable 30 is bent at the curvature radius R to which the increment value P is added in step S204. The bending portion coordinate value is calculated by the conversion unit 22 (step S205, bending state calculation step). The method of calculating the bending state coordinate value by the conversion unit 22 is the same as that in step S108 described above, and is calculated based on the linear state coordinate value obtained in steps S103 to S105.
Here, since the count value C is set to “1” in step S202, the bending state coordinate value of each cross-sectional center point of the first conductor wire 31 is calculated.

  Next, based on the bending state coordinate value of each cross-section center point of the first conductor wire 31 calculated in step S205, the control unit 27 causes the curvature calculator 24 to transmit each cross-section of the first conductor wire 31. The curvature K of the center point is calculated (step S206, curvature calculation step). The calculation method by the curvature calculation unit 24 is the same as in step S111.

Next, the control unit 27 is calculated before adding the curvature K of each cross-sectional center point of the first conductor wire 31 calculated in step S206 and the increment value P, which is expressed by the following equation (4). A curvature difference δK, which is a difference from the curvature K of each cross-sectional center point of the first conductor wire 31, is calculated, and an integrated value of the curvature difference δK is calculated based on the following equation (5) (step S207).
δK = | Curvature K _(R) -Curvature K _(RP) |
Integrated value of new curvature difference δK = δK + integrated value of current curvature difference δK (5)

In the above equation (4), the curvature K _(R) is the curvature K calculated in step S206 based on the curvature radius R to which the increment value P is added in step S204, and the curvature K _(RP) is The curvature K is calculated based on the curvature radius R immediately before the increment value P is added.
Further, the above formula (5) becomes a new “cumulative value of curvature difference δK” by adding the curvature difference δK calculated in the above formula (4) to the current “integrated value of curvature difference δK”. Thus, the curvature difference δK is integrated.

In step S207, after calculating the integrated value of the curvature difference δK, the control unit 27 proceeds to step S208, and determines whether the curvature radius R is 100000 mm or more.
When it is determined that the curvature radius R is 100000 mm or more, the process proceeds to step S209. On the other hand, if it is determined that the distance is smaller than 100000 mm, the process returns to step S204, and an additional value P is further added to the curvature radius R, and the same calculation as above is performed. That is, the control unit 27 repeats steps S204 to S208 until it is determined in step S208 that the radius of curvature R is 100000 mm or more.
In step S208, the reason why the value for determining the curvature radius R is set to 100000 mm is that the increment value P is added to the curvature radius R in step S204, and the stranded cable 30 is finally approximated to a straight line state. This is because steps S204 to S208 are repeated until possible. Therefore, the value for determining the curvature radius R in step S208 may be a value that is sufficiently large with respect to the size of the stranded cable 30 and that the stranded cable 30 can approximate to a straight line state. The stranded cable 30 to be processed in the system 10 is assumed to be used for automobiles, industrial machines, and the like. When the value of the curvature radius R is 100,000 mm, the curvature radius R is It can be said that the stranded wire cable has a value that can be approximated to a straight state.

When it is determined in step S208 that the value of the curvature radius R is 100000 mm or more, the control unit 27 proceeds to step S209 and repeats steps S204 to S208 to obtain each of the first conductor wires 31 obtained. The “integrated value of the curvature difference δK” of the cross-sectional center point is acquired as the curvature displacement ΔK when the stranded cable 30 is bent at the curvature radius R as the initial value acquired in step S102.
That is, the control unit 27 repeats steps S204 to S208 so that the curvature radius R of the stranded cable 30 as the initial value acquired in step S102 is a value that can approximate the stranded cable 30 to a linear state. Until the value of the curvature radius R increases by the increment value P, the value of the curvature K is calculated, and the calculated curvature difference δK of the curvature K is integrated. Thus, the “integrated value of the curvature difference δK” obtained is the curvature displacement ΔK at the center point of each cross section of the conductor wire 31 when the stranded cable 30 in the straight state is bent at the curvature radius R. 10, the curvature displacement ΔK of each cross-sectional center point of the conductor wire 10 can be obtained along the path when the stranded cable 30 in the bent state with the curvature radius R is in a straight state. As a result, even if the conductor wire 31 is in a complicated bent state such as a spiral structure, the curvature displacement ΔK can be obtained with high accuracy.

When the curvature displacement ΔK is acquired in step S209, the control unit 27 determines whether or not the count value C of the counter 28 is equal to or greater than the number n (= 6) of the conductor wires 31 (step S210). When the count value C is equal to or greater than the number n of the conductor lines 31, the process proceeds to step S212.
On the other hand, when the count value C is smaller than the number n of the conductor wires 31, the process proceeds to step S211, and the control unit 27 adds “1” to the count value C of the counter 28 and returns to step S203. Here, since the count value C is set to “1” in step S202, the count value C is set to “2”.
The control unit 27 calculates the curvature displacement ΔK of the center point of the cross section for the second conductor wire 31 by the above-described steps S204 to S209.
As described above, the control unit 27 sequentially repeats the calculation of the linear state coordinate value of the cross-sectional center point of each conductor line 31 until steps S204 to S209 are performed until the curvature displacement ΔK of the sixth conductor line 31 is calculated. repeat. When the curvature displacement ΔK of the sixth conductor wire 31 is calculated, the count value C of the counter 28 is set to “6”, and the process proceeds to step S212.
In this way, Steps S204 to S209 are repeated for all n (six) conductor wires 31 included in the stranded cable 30, and the curvature displacement ΔK of each cross-sectional center point is calculated. The curvature displacement ΔK calculated here is stored in the storage unit 13 in association with each cross-sectional center point of each of the first to sixth conductor wires 31 as shown in FIG. .

  As described above, steps S203 to S211 are performed in accordance with the above-described steps (bending degree displacement step, bending state calculation step, curvature calculation step) until the radius of curvature R becomes a value that can approximate the stranded cable 30 to the straight line state. While iterating, a curvature difference integration step of integrating the curvature difference δK is configured. Moreover, the control part 27 which implement | achieves this comprises a curvature difference integration part.

Next, in step S212, the control unit 27 graphs the curvature displacement ΔK at each cross-sectional center point of the first to sixth conductor wires 31 as a curvature displacement distribution along the longitudinal direction of the stranded wire cable 30. Output to a display or the like (curvature displacement distribution output step).
FIG. 11B is a diagram illustrating an example in which the curvature displacement calculated by the curvature calculation unit 24 is graphed as a curvature displacement distribution. In the figure, the horizontal axis is the axial distance along the longitudinal direction of the stranded cable 30 and indicates the coordinate value in the Y direction. The vertical axis indicates the numerical value of the curvature displacement ΔK. Each diagram a2 to f2 shown in the drawing corresponds to each of the first to sixth conductor lines 31, and accordingly, the diagrams a1 to f1 and FIG. 8 in FIG. Each corresponds to the middle diagrams a to f.
Thus, in addition to the diagram showing the bent shape of the conductor wire 31 and the graph of the curvature distribution, the curvature displacement of the conductor wire 31 can be visually output by graphing and outputting the curvature displacement. The operator can easily grasp whether ΔK is large.
Further, for example, as shown in FIG. 12, the control unit 27 displays variations such as the maximum value, the average value, and the standard deviation of the curvature displacement ΔK of the cross-sectional center points of the first to sixth conductor wires 31. You can also. In the present system 10, the curvature displacement ΔK calculated by the control unit 27 is stored in the storage unit 13 in association with each cross-sectional center point as shown in FIG. , The maximum value, average value, standard deviation, etc. of the curvature displacement ΔK can be obtained and acquired (step S213).
For this reason, according to this system 10 and the bending state visualization method according to this system 10, in addition to the diagrams a to f showing the bending state of the conductor wire 31, in addition to the curvature distribution of the stranded cable 30, the curvature displacement ΔK Since each information related to this can be displayed, the bent state of the conductor wire 31 of the stranded cable 30 in the bent state can be grasped from various angles.

[Calculation of expected life]
Next, the control unit 27 calculates the expected life of the stranded cable 30 based on the curvature displacement ΔK calculated in the above steps. Hereinafter, a method for calculating the expected life will be described.
Referring to FIG. 5, after outputting the curvature displacement distribution of conductor wire 31 in step S <b> 212, control unit 27 performs the curvature displacement of each cross-sectional center point of all first to sixth conductor wires 31. The maximum value of ΔK is acquired (step S213). As described above, when the maximum value of the bending displacement ΔK is acquired at the stage of displaying the bending displacement ΔK, this can be used.

Then, the control unit 27 causes the predicted life calculation unit 26 to multiply the maximum value of the bending displacement ΔK by the radius q1 of the conductor wire 31, and the bending strain Δε at the center point of the cross section of the conductor wire 31 at which the bending displacement ΔK becomes the maximum value. Is calculated. Thereafter, the expected life calculation unit 26 refers to data indicating the relationship between the bending strain Δε and the bending life that the system 10 has in advance, and calculates the predicted bending life based on the bending strain Δε. (Step S214).
FIG. 13 is a diagram showing an example of data indicating the relationship between the bending strain Δε and the bending life related to the conductor wire 31 that the system 10 has in advance. In FIG. 13, the abscissa indicates the bending strain Δε of the conductor wire 31 and the ordinate indicates the number of times that the conductor wire 31 breaks as the bending life. This system 10 is a graph as shown in FIG. 13, for example, showing data showing the correlation between the bending strain Δε and the bending life of the material used for the wire 31a of the conductor wire 31 obtained by conducting an experiment in advance. As stored in the storage unit 13. When the expected life calculation unit 26 calculates the bending strain Δε, it can derive the bending life corresponding to the calculated bending strain Δε of the conductor wire 31 by referring to this graph.
As described above, steps S213 and S214 constitute a predicted life calculation step of obtaining the maximum value of the integrated value of the curvature difference and calculating the predicted bending life of the stranded cable 30 based on the maximum value.

  The bending life (breakage) of the conductor wire 31 is also the bending life of the stranded wire cable 30. Therefore, according to the present system 10 and the cable bending life prediction method according to this system 10, the bending life of the stranded wire cable 30 is calculated based on the curvature displacement ΔK of the conductor wire 31, so that the bending state of the conductor wire having a spiral structure is calculated. It is possible to predict the bending life of a stranded cable in consideration of the above. As a result, the prediction accuracy of the calculated bending life of the stranded cable can be further increased.

In the above embodiment, the case where the layer-twisted stranded cable 30 (number of conductor wires n = 6) is treated has been described. For example, the twisted stranded cable of the twisted pair method (number of conductor wires n = 8). ) Is a processing target, the respective diagrams a to h connecting the cross-sectional center points of the first to eighth conductor wires constituting the stranded cable in the bent state are as shown in FIG. In addition, the curvature distribution and the distribution of the curvature displacement are shown in FIGS. 15 (a) and 15 (b).
Each of the diagrams a1 to h1 and diagrams a2 to h2 in FIGS. 15A and 15B correspond to the first to sixth conductor lines 31, respectively, and the diagrams a to h in FIG. It corresponds to. Referring to FIGS. 15A and 15B, it can be seen that the conductor wires of the stranded cable have a twisted pair, so that the curvatures of the individual conductor wires have various distributions. For this reason, the curvature displacement has various distributions. Among them, the part where the curvature and the curvature displacement have the largest value can be easily grasped visually.
The bending life of the stranded cable can be predicted from the obtained calculation results of the curvature displacement.

  Further, FIG. 8 (b) showing the shape of the conductor wire in the bent twisted cable, FIG. 11 (a) showing the curvature distribution, and FIG. 11 (b) showing the curvature displacement are, for example, As shown in FIG. 16, it is preferable to display them in parallel on the display at the same time. In this case, it becomes easy to refer to each other, and it is easy to grasp the bent state of the conductor wire 31 of the stranded cable 30 from various angles.

Further, in FIG. 16, for example, when the cursor or the like is matched with an arbitrary part of each of the diagrams showing the shape of the conductor wire in a bent state displayed on the display and designated with a mouse or the like, the present system 10 The control unit 27 may recognize the position on the diagram, display a point on the portion, and display data of the cross-sectional center point of the portion.
It is also possible to display the points on all of the portions corresponding to the data of the cross-sectional center point of the designated portion. For example, in FIG. 16, if the portion of the point T1 on the diagram showing the shape of the conductor wire in the bent state is designated, a point T11 is placed on the portion corresponding to the cross-sectional center point of the point T1 on the diagram showing the curvature distribution. Similarly, the point T21 may be displayed at a portion corresponding to the cross-sectional center point of the point T1 on the diagram showing the curvature displacement distribution. In the present system 10, each data (bending state coordinate value, curvature, and curvature displacement) is stored in the storage unit 13 in association with the cross-sectional center point. Even if a portion is selected, the corresponding portion can be specified. In this case, positions corresponding to each other in each diagram can be easily grasped.
Further, for example, when the operator selects a point T1, a point T2 may be displayed for a part at a position that is 1/2 pitch different from the point T1. In this case, it is possible to display the positional relationship between the designated point in the stranded wire cable and a point having a 1/2 pitch difference (a position that is 180 degrees different in cross-sectional view) with respect to that point. This is effective when grasping the shape of the state.

In addition, the shape state measuring method of the stranded wire cable of this invention is not limited only to the said embodiment. For example, in the above embodiment, the twisted structure of the conductor wire of the stranded cable is configured so that only two types of structures, the layer twist method and the pair twist method, can be selected, but other twist methods are also processed. Can be configured.
Moreover, in the said embodiment, although the curvature radius was used as a bending degree which shows the bending state of a strand wire cable, a bending degree can also be represented by a curvature or another method.
Moreover, in the said embodiment, although the radius of a conductor wire, the twist pitch, etc. were used as a structural parameter for specifying the structure of a conductor wire, for example, the diameter dimension of the whole twisted cable, the dimension of other parts, etc. Any parameter that can specifically identify the structure of the conductor wire and that can calculate the coordinate value of the center point of the cross section can be used as the structure parameter.

It is a block diagram which shows the bending life prediction system for predicting the bending lifes, such as a strand wire cable. It is a figure which shows the twisted-wire cable of the layer twist system used as the object which visualizes the bending state of a conductor wire by this system, and predicts the bending life of a twisted-wire cable, (a) shows the structure of a twisted-wire cable A perspective view and (b) are sectional views. It is a figure which shows the twisted-wire cable of a twist system, (a) is a perspective view which shows the structure of a twisted-wire cable, (b) is sectional drawing. It is the flowchart which showed the specific process which this system performs. 5 is a flowchart showing specific processing performed by the present system, and is a continuation of FIG. (A) is an example of a display display for receiving a structural parameter, and (b) is an example of a display display for receiving a structural parameter when processing a twisted cable of a twisted pair system. It is a figure which shows the aspect of the data of the calculation result of the linear state coordinate value of the cross-sectional center point about a conductor wire. (A) is a diagram two-dimensionally showing a diagram connecting the cross-sectional center points based on the linear state coordinate values, and (b) is a diagram connecting the diagram connecting the cross-sectional center points to the bent state coordinate values. It is the figure shown based on two dimensions based on it. It is a figure which shows the aspect of a display display which can show the diagram which connects a cross-sectional center point in three orthogonal directions of X, Y, and Z in three dimensions. It is a figure which shows the aspect at the time of calculating | requiring the curvature of a conductor line from the three cross-section center points arranged in the longitudinal direction among the cross-section center points of one conductor line. (A) is a figure which shows an example which plotted the curvature calculated by the curvature calculating part as curvature distribution, (b) is a graph which shows the curvature displacement calculated by the curvature calculating part as curvature displacement distribution. FIG. It is a figure which shows the other example of a display of a curvature displacement. It is a figure which shows an example of the data which show the relationship between the bending distortion concerning a conductor wire, and a bending life which this system has beforehand. It is the figure which showed the diagram which connects the cross-sectional center point of the twisted-wire cable of a pair twist system two-dimensionally based on the bending state coordinate value. It is a calculation result of the twisted-wire cable of a pair twist system, (a) is a figure which shows an example which graphed the curvature calculated by the curvature calculation part as curvature distribution, (b) is a figure by a curvature calculation part. It is a figure which shows an example which graphed the calculated curvature displacement as curvature displacement distribution. It is a figure which shows the aspect at the time of displaying each diagram which shows the bending state of each conductor wire simultaneously in parallel on a display.

Explanation of symbols

10 Bending life prediction system 11 Input device (input unit)
12 Output devices (input unit, output unit)
21 Coordinate value calculation unit (straight line calculation unit)
22 Conversion unit (bending state calculation unit)
23 Diagram generator (output unit)
26 Expected life calculation unit 27 Control unit (flexibility displacement unit, curvature difference integration unit)

Claims (11)

A bending state visualization method for a conductor wire, wherein the bending state of the conductor wire when bending a stranded cable in which a plurality of conductor wires are twisted and bundled is calculated and visualized by a computer,
A structural parameter input step in which a computer receives input of structural parameters for determining the twisted structure of the conductor wire;
A bending degree input step in which a computer receives an input of the bending degree of the stranded wire cable;
Based on the input structural parameters, the computer calculates the bending state of each conductor wire when the stranded cable is in a straight state; and
The bending state of each conductor wire when the stranded wire cable is in a bent state, the bending state of each conductor wire when the stranded wire cable is in a straight state, and the bending degree of the input stranded wire cable A bending state calculation step calculated by a computer;
An output step of generating and outputting an image showing a bent state of each conductor wire when the twisted cable is in a bent state; and
A method for visualizing the bending state of a conductor wire, comprising: A curvature calculating step of approximately calculating the curvature of each conductor wire based on the bending state of each conductor wire calculated by the bending state calculating step;
The method of visualizing a bent state of a conductor wire according to claim 1, further comprising a curvature output step of outputting the curvature of each conductor wire obtained by the curvature calculation step. In the straight line state calculating step, the three orthogonal directions are set to X, Y, and Z, the longitudinal direction of the stranded cable is parallel to the Y direction, and the cross-sectional center of each conductor wire passes through the longitudinal direction. A linear state coordinate value that is a coordinate value of a plurality of cross-sectional center points arranged along the center line is calculated as a bent state of each conductor wire when the stranded cable is in a straight state,
In the bending state calculating step, a bending state coordinate value that is a coordinate value of the center point of the cross section when the bending center is parallel to the Z direction is set as the conductor value when the stranded cable is in the bending state. Is calculated as the bending state of
2. The conductor wire bending according to claim 1, wherein the output step generates and outputs a diagram connecting the cross-section center points of the respective conductor lines based on a bending state coordinate value of the cross-section center point. State visualization method. The bending degree is a radius of curvature,
The bending state visualization of the conductor wire according to claim 3, wherein the bending state calculation step converts a linear state coordinate value of the cross-sectional center point into the bending state coordinate value based on the following formulas (1) to (3). Method.
x ′ = R− (R−x) × cos (y / R) (1)
y ′ = (R−x) × sin (y / R) (2)
z '= z (3)
However, R is a radius of curvature, (x, y, z) is a linear state coordinate value, and (x ′, y ′, z ′) is a bent state coordinate value.   The curvature calculating step specifies three points arranged in the longitudinal direction of the conductor line among the center points of the cross section, and sequentially calculates at least the curvature of an arc passing through these three points as an approximate curvature of the conductor line. The bending state visualization method of the conductor wire of Claim 2.   The conductor parameters according to any one of claims 1 to 5, wherein the structural parameters include a conductor wire twisting method, the number of conductor wires, a conductor wire diameter (either a radius or a diameter), and a twist pitch. The bending state visualization method. A bending state visualization method for a conductor wire, wherein the bending state of the conductor wire when bending a stranded cable in which a plurality of conductor wires are twisted and bundled is calculated and visualized by a computer,
A structural parameter input step in which a computer receives input of structural parameters for determining the twisted structure of the conductor wire;
A bending degree input step in which a computer receives an input of the bending degree of the stranded wire cable;
Based on the input structural parameters, the computer calculates the bending state of each conductor wire when the stranded cable is in a straight state; and
A bending degree displacement step of displacing the bending degree in a direction in which the stranded wire cable approaches a linear state by adding a predetermined value to the bending degree;
From the bending state of each conductor wire when the stranded wire cable is in a bent state, the bending state of each conductor wire when the stranded wire cable is in a straight state, and the bending degree of the stranded wire cable, A bending state calculating step to calculate;
A curvature calculating step of approximately calculating the curvature of each conductor wire based on the bending state of each conductor wire calculated by the bending state calculating step;
The bending degree displacement step, the bending state calculation step, and the curvature calculation step are repeated until the bending degree reaches a value that can approximate the stranded cable to a straight line state, and the bending degree displacement step includes the bending degree displacement step. A curvature difference integrating step of integrating a curvature difference that is a difference between a curvature calculated after displacing the degree of curvature and a curvature calculated immediately before displacing the degree of bending;
And a curvature difference integrated value output step of outputting an integrated value of the curvature difference obtained by the curvature difference integration step. A cable bending life prediction method for predicting the bending life of the stranded wire cable by computing a bending state of the conductor wire when a stranded wire cable in which a plurality of conductor wires are twisted and bundled is bent. ,
A structural parameter input step in which a computer receives input of structural parameters for determining the twisted structure of the conductor wire;
A bending degree input step in which a computer receives an input of the bending degree of the stranded wire cable;
Based on the input structural parameters, the computer calculates the bending state of each conductor wire when the stranded cable is in a straight state; and
A bending degree displacement step of displacing the bending degree in a direction in which the stranded wire cable approaches a linear state by adding a predetermined value to the bending degree;
From the bending state of each conductor wire when the stranded wire cable is in a bent state, the bending state of each conductor wire when the stranded wire cable is in a straight state, and the bending degree of the stranded wire cable, A bending state calculating step to calculate;
A curvature calculating step of approximately calculating the curvature of each conductor wire based on the bending state of each conductor wire calculated by the bending state calculating step;
The bending degree displacement step, the bending state calculation step, and the curvature calculation step are repeated until the bending degree reaches a value that can approximate the stranded cable to a straight line state, and the bending degree displacement step includes the bending degree displacement step. A curvature difference integrating step of integrating a curvature difference that is a difference between a curvature calculated after displacing the degree of curvature and a curvature calculated immediately before displacing the degree of bending;
Obtaining the maximum value of the integrated value of the curvature difference of each conductor wire obtained by the curvature difference integrating step, and calculating the predicted bending life of the stranded wire cable based on the maximum value A cable bending life prediction method comprising: a calculation step. A bending state visualization system for a conductor wire, wherein a bending state of the conductor wire when bending a stranded cable in which a plurality of conductor wires are twisted and bundled is calculated and visualized by a computer,
A structural parameter input unit for accepting an input of a structural parameter for determining a twisted structure of the conductor wire; and
A degree-of-flexibility input unit that accepts an input of the degree of flexion of the stranded cable; and
Based on the input structural parameters, a linear state calculation unit that a computer calculates a bending state of each conductor wire when the stranded cable is in a linear state;
The bending state of each conductor wire when the stranded wire cable is in a bent state, the bending state of each conductor wire when the stranded wire cable is in a straight state, and the bending degree of the input stranded wire cable A bending state calculation unit that is calculated by a computer;
An output unit that generates and outputs an image indicating a bent state of each conductor wire when the twisted cable is in a bent state; and
A system for visualizing the bending state of a conductor wire, comprising: A cable bending life prediction system for calculating a bending state of the stranded wire cable by calculating a bending state of the stranded wire when a stranded wire cable in which a plurality of conductor wires are twisted and bundled is bent by a computer. ,
A structural parameter input unit for accepting an input of a structural parameter for determining a twisted structure of the conductor wire; and
A degree-of-flexibility input unit that accepts an input of the degree of flexion of the stranded cable; and
Based on the input structural parameters, a linear state calculation unit that a computer calculates a bending state of each conductor wire when the stranded cable is in a linear state;
By adding a predetermined value to the bending degree, a bending degree displacement part that displaces the bending degree in a direction in which the stranded cable approaches a linear state; and
From the bending state of each conductor wire when the stranded wire cable is in a bent state, the bending state of each conductor wire when the stranded wire cable is in a straight state, and the bending degree of the stranded wire cable, A bending state calculation unit for calculating;
A curvature calculator that approximately calculates the curvature of each conductor wire based on the bending state of each conductor wire calculated by the bending state calculator;
The bending degree displacement unit, the bending state calculation unit, and the curvature calculation unit repeat the calculation until the bending degree becomes a value that can approximate the stranded cable to a linear state, and the bending degree displacement unit A curvature difference integration unit that integrates a curvature difference that is a difference between a curvature calculated after displacing the bending degree and a curvature calculated immediately before displacing the bending degree;
Obtaining the maximum value among the integrated values of the curvature differences of the respective conductor wires obtained by the curvature difference integrating unit, and calculating the predicted bending life of the stranded wire cable based on the maximum value A cable bending life prediction system comprising: a calculation unit. A bending state visualization program for a conductor wire, wherein a bending state of the conductor wire when bending a stranded cable in which a plurality of conductor wires are twisted and bundled is calculated and visualized by a computer,
On the computer,
A structural parameter input step in which a computer receives input of structural parameters for determining the twisted structure of the conductor wire;
A degree-of-flexion input step in which a computer receives an input of the degree of flexion of the stranded cable; and
Based on the input structural parameters, a linear state calculation step in which a computer calculates a bending state of each conductor wire when the stranded cable is in a linear state;
The bending state of each conductor wire when the stranded wire cable is in a bent state, the bending state of each conductor wire when the stranded wire cable is in a straight state, and the bending degree of the input stranded wire cable A bending state calculation step calculated by a computer;
An output step of generating and outputting an image showing a bent state of each conductor wire when the twisted cable is in a bent state; and
Conductor wire bending state visualization program to execute.

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