JP3991766B2 - Apparatus, method and program for calculating movable range of linear material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to calculation of a linear material movable range for calculating a movable range of a linear material locked by two locking portions.
[0002]
[Prior art]
In automobiles and home appliances, a large number of linear materials (cables) are used for power supply and signal transmission. If all the linear members are arranged independently, the individual cables must be fixed independently of each other, and the work is complicated and the cost increases. Furthermore, the routing of individual wires is complicated and often becomes an obstacle during repairs.
[0003]
Therefore, in a normal case, a plurality of cables to be collected are generally bundled into one bundle, and this is generally a wire harness (W / H) covered with a skin material. The W / H is fixed to the main body with a locking member at a predetermined portion, and the cable is branched at a necessary portion.
[0004]
In particular, in an automobile, the length of a cable is long because a vehicle body is large, and a large number of electrical components are mounted. Therefore, the number of cables bundled in a wire harness is very large.
[0005]
Therefore, the design of the route and locking points of the wire harness has become important. As for the design of this wire harness, a skilled designer generally makes a prototype based on experience and evaluates it. However, such designs often have inefficiencies, and lack design adaptability and adaptability to different models. In order to improve efficiency and optimization, it has been proposed to use a design method using a computer. For example, Japanese Patent Laid-Open No. 2001-250438 discloses a wire harness design by computer-aided design (CAD).
[0006]
[Problems to be solved by the invention]
The wire harness moves within a predetermined range between the locking points. Therefore, accurately grasping this movable range is important in designing the wire harness. In particular, the movable range of the wire harness varies depending on a plurality of factors such as the number of bundled wires, the length between the locking points, and the type of skin material. In the conventional CAD, there is a problem that these factors are not sufficiently grasped and an accurate wire harness movable range cannot be calculated.
[0007]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a linear material movable range calculation apparatus, method, and program capable of accurately calculating the movable range of a linear material such as a wire harness.
[0008]
[Means for Solving the Problems]
The present invention is a linear material movable range calculation device for calculating a movable range of a linear material locked by two locking portions, wherein the linear material rigidity and the linear material are related to two. A measured value storage means for storing measured maximum amplitudes measured at a plurality of predetermined points of the linear material with a maximum amplitude having a maximum length in a direction perpendicular to a straight line that is locked by the locking portions and connecting the locking portions; The movable range of the linear material when the linear material is deformed between the two locking portions based on the length of the linear material and the locking direction of the locking portion of the linear material. And a maximum amplitude at a location corresponding to the predetermined point stored in the measured value storage means in the movable range of the linear material calculated by the movable range calculation means. The obtained maximum amplitude amount and the measured maximum amplitude amount are compared, and the movable range of the linear material is determined from the obtained comparison result. And having a correction means for correcting.
[0009]
Thus, according to the present invention, the maximum amplitude amount in the movable range obtained by calculation is compared with the actually measured maximum amplitude amount, and correction is performed based on the comparison result. As a result, the physical properties and size of the linear material can be taken into consideration, and it is possible to effectively calculate the various movable ranges of W / H with a relatively small amount of experiment.
[0010]
Further, it is preferable that the actual measured value maximum amplitude amount is stored by classifying the linear member locking method, the type of the linear member, and the thickness of the linear member as factors. .
[0011]
Moreover, it is preferable that the actual measurement storage unit is further classified and stored by using the length between two points of the locking portion and the length of the linear material as factors.
[0012]
Since the actual measurement value of the maximum amplitude is stored in accordance with the locking method and type of the linear member, correction according to the characteristics of the linear material can be performed.
[0013]
The movable range calculating means calculates a plurality of movable trajectories deformed based on the locking direction, length, and minimum bending radius of the linear member between the locking portions, and connects the locking portions. A plurality of surfaces orthogonal to the straight line are provided depending on the distance from the locking portion on the straight line, and intersection points between the surface and the plurality of movable loci are obtained, and an outer peripheral point sequence of the intersection points on the same surface is defined as a surface. It is preferable to calculate the movable range by connecting the outer peripheral point sequences for each of the determined surfaces.
[0014]
Further, the rigidity of the linear material is the minimum bending radius of the linear material, and it is preferable that the rigidity is obtained from the material and thickness of the linear material.
[0015]
Further, the linear material is configured by bundling a plurality of individual linear materials, and the type of the linear material is a type of a skin material that is packaged on the bundling of the plurality of individual linear materials. Preferably it is.
[0016]
As described above, since the characteristics of the linear material are reflected, it is possible to calculate a correct movable range that matches the actual use state of the linear material.
[0017]
Further, it is preferable that the linear material is a wire harness.
[0018]
Moreover, this invention is a linear material movable range calculation method which calculates the movable range of the linear material latched by two latching | locking parts, Comprising: The said linear material is latched by two latching | locking parts. Then, the maximum amplitude that is the maximum length in the direction perpendicular to the straight line connecting the locking portions is stored in the measured maximum amplitude amount measured at a plurality of predetermined points of the linear material, and the rigidity of the linear material and the linear Based on the length of the linear material and the locking direction of the locking portion of the linear material, the movable range of the linear material when the linear material is deformed between the two locking portions is calculated. Then, within the calculated movable range of the linear material, a maximum amplitude amount at a location corresponding to the predetermined point is obtained from the stored actually measured maximum amplitude amount, and the obtained maximum amplitude amount and the actually measured maximum Comparing the amount of amplitude, correcting the movable range of the linear material from the obtained comparison result, and determining the movable range of the linear material
[0019]
Further, the present invention is a linear material movable range calculation program for calculating a movable range of a linear material locked by two locking portions, the computer comprising: a rigidity of the linear material; Based on the length of the material and the locking direction of the locking portion of the linear material, the movable range of the linear material when the linear material is deformed between the two locking portions is calculated. The measured maximum amplitude of the linear material measured at two or more predetermined points on the linear material, with the linear material locked by two locking portions and the maximum amplitude in the direction perpendicular to the straight line connecting the locking portions. Is read from the measured value storing means for storing the maximum amplitude amount at the place corresponding to the predetermined point in the movable range of the linear material calculated by the movable range calculating means. The obtained maximum amplitude amount is compared with the read actual maximum amplitude amount, and the comparison result obtained To correct the movable range of al the linear member, characterized in that to calculate the corrected movable range.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
First, a linear material movable range calculating device according to the present invention is basically configured by a computer, and the computer executes a linear material movable range calculating program to function as a linear material movable range calculating device. To do.
[0022]
A wire harness (W / H) in a vehicle is taken up as a linear material, and calculation of the movable range of this W / H will be described below.
[0023]
First, the basic operation will be described with reference to FIG. First, a table for minimum bending radius, maximum amplitude, etc. is created (S11). This is done by storing data that is a collection of data obtained by conducting an experiment under a predetermined condition with respect to a plurality of types of W / H having different types of W / H and different locking methods.
[0024]
When the table is created, input processing such as calculation conditions is performed (S12). This is an input of conditions for the linear material (W / H) that is actually the object of calculation.
[0025]
When the input of the calculation conditions is completed, a calculation process for the minimum bending radius and the maximum amplitude is executed (S13). The calculation of the minimum bending radius and the maximum amplitude amount is based on the actual measurement data stored in the table created in S11, and when it cannot be applied directly, it is calculated by performing an interpolation process. That is, what is calculated here is a value based on the actually measured values for the minimum bending radius and the maximum amplitude.
[0026]
When the calculation of the minimum bending radius and the maximum amplitude based on the actually measured values is completed, the W / H movable locus curve definition process is performed (S14). This is based on the start point / end point position of W / H and the locking direction of the start point / end point, and the possible movement range of the curve is obtained by theoretical calculation. Thereby, a theoretically possible trajectory curve is calculated.
[0027]
When the calculation of the locus curve by theoretical calculation is completed, the maximum amplitude amount correction process is performed (S15). The maximum amplitude in the trajectory obtained in S14 is compared with the maximum amplitude obtained in S13, a ratio between the two is obtained, and the trajectory in S14 is corrected based on this ratio.
[0028]
When this correction process is completed, a W / H movable range surface definition process is performed (S16). This definition process recognizes a closed curve by connecting a series of outer peripheral points on each cut surface, and connects this to each cut section to define an outer peripheral surface of the movable range.
[0029]
And the output process of a W / H movable range surface is performed (S17). That is, this surface is output in an appropriate format such as IGES format or STL format.
[0030]
In this way, in the present embodiment, the actual movable range is calculated by correcting the movable range obtained by calculation based on the actual measurement value. For this reason, it is possible to correctly calculate the movable range. In addition, by preparing a table obtained from a certain experiment instead of performing it all through experiments, calculation processing can be performed for various movable ranges of W / H, and design efficiency can be improved. .
[0031]
Next, each process described above will be described individually.
[0032]
First, the creation of the table in S11 will be described with reference to FIG. As shown in FIG. 2, the table is created in the order of creation of a minimum bending radius comparison table (S21), creation of a maximum amplitude table (S22), and creation of a pitch / cable length change rate table between clamps (S23). .
[0033]
Here, the creation of the comparison table in S21 will be described with reference to FIG. First, the actual cable is bent, and the minimum bending radius is measured from the radius when the cable is bent most tightly (S31).
[0034]
Next, a cable is attached to the experimental apparatus, and the amplitude is measured (S32). The experimental apparatus has, for example, a locking point interval of 180 mm, and a cable is mounted so that the length is 200 mm between the locking points. And this cable is moved and the amplitude F is measured.
[0035]
Next, the amplitude F2 is calculated by giving the minimum bending radius measured in S31 under the conditions for measuring the amplitude (for example, the interval between the locking points is 180 mm and the length is 200 mm between the locking points) ( S33).
[0036]
Then, an optimal minimum bending radius is calculated by R = R + (F2-F) (S34). That is, the minimum bending radius obtained in S31 and the amplitude F actually measured in the experiment are corrected to calculate an optimum minimum bending radius that is practical.
[0037]
Next, as shown in FIG. 4, a maximum amplitude table is created. First, fixing conditions (clamp type, thickness, exterior type) in the experimental apparatus (bench) are determined (S41). Cable clamp types include long hole bands, round hole bands, long hole sleeves, round hole sleeves, long hole sleeves, round hole sleeves, etc., which are selected in sequence. Further, as the cable exterior type, non-exterior, rough winding, half wrap, COT, C-VO (0.5 mm), etc. are adopted. Further, for the cable thickness, φ5, φ8, φ11, φ15, etc. are adopted. Note that the pitch between clamps of the experimental apparatus is 180 mm, and the cable length is 200 mm.
[0038]
If the conditions are determined, the cable is fixed to the experimental bench under the above fixed conditions, and the maximum amplitude is measured (S42). This test is repeated for each clamp type, cable thickness, and exterior type to create a maximum amplitude table.
[0039]
Then, under various fixing conditions, the ratio of the pitch between the clamps and the cable length is changed, and the maximum amplitude is measured. Thus, an amplitude correspondence table of pitch between clamps / cable length is obtained. For example, the test is performed by changing the cable length by setting the pitch between the clamps to 180 mm / cable length 180 mm = 1. For example, the above-described clamp pitch 180 mm / cable length 200 mm = 0.9, and the maximum amplitude length at this time is set to 1, the amplitude length under other conditions is measured, and a table is created.
[0040]
In this way, a table for the amplitude correspondence table of the minimum bending radius (measured value), the maximum amplitude (measured value), and the pitch between clamps / cable length under various conditions in S11 is obtained. The process of S11 may be basically performed once, and the completed table is stored in the computer. It is preferable to rewrite the table as necessary.
[0041]
Next, in the input process such as the calculation condition in S12, for example, “product name: input name” “start point coordinates (X, Y, Z): input start point three-dimensional coordinates” “start point locking direction” (X, Y, Z) (2 point indication): Enter 2 points to determine the locking direction. “Start clamp type: Enter clamp type such as long hole band” “End point coordinates (X, Y, Z) Z): Enter the three-dimensional coordinates of the end point ”“ End point locking direction (X, Y, Z) (2 point designation): Enter two points to determine the locking direction ”“ End point clamp type: End point Enter the type of clamp.In this case, it is possible to input the same as the start point. "" Exterior type: Enter what kind of exterior is "" Cable thickness: Enter the thickness of the cable "" Cable Length: Enter the distance between the start point and end point "" Cable length tolerance: Tolerance Conditions of an input "is input. Thus, the W / H to be calculated from now is specified.
[0042]
The calculation process of the minimum bending radius and the maximum amplitude in S13 is a calculation based on actual measurement values. First, the minimum bend radius is calculated by entering (i) if the thickness is in the minimum bend radius comparison table, and (ii) if the thickness is not in the minimum bend radius comparison table, enter the minimum bend. The radius is predicted and adopted by the least square approximation method. Also, regarding the calculation of the maximum amplitude amount, if (i) the thickness is in the maximum amplitude amount table, the value in the maximum amplitude amount table is directly input to the maximum lifting amount, and (ii) the thickness is the maximum. If the amplitude amount is not in the table, the maximum lifting amount is predicted by the least square approximation method and adopted.
[0043]
In this way, the minimum bending radius and the maximum amplitude amount F (maximum lifting amount) are calculated.
[0044]
Next, in S14, the movable trajectory of W / H is calculated by mathematical theory. That is, a pair of locking (clamping) points is determined, and the locking direction (cable direction at the clamping point) is determined here. For this reason, the start point end point coordinates and the tangent direction at the start point end point are determined. Therefore, for the line segment from the start point and the end point, the locus of the line segment when the line segment is lifted at a predetermined position is calculated. Here, the length of W / H and the minimum bending radius are determined. Therefore, the length and the minimum bending radius of the obtained trajectory are checked, and those having no problem are adopted as the trajectory. Then, this process is sequentially performed at a plurality of positions between the start point and the end point. As a result, all possible trajectories between the start point and the end point are calculated.
[0045]
The total length of W / H is obtained by a fifth-order Legendre polynomial. The minimum bending radius is checked by assuming that the curve between the start point and the end point is a cubic polynomial, defining the tangent direction at the start point and the end point, and checking the condition that the curvature radius of the obtained curve is equal to or less than the minimum bend radius. By doing.
[0046]
In the maximum amplitude correction processing in S15, as shown in FIG. 5, first, a cut section is defined (S51). This cut section is provided at a predetermined interval between the start point and the end point. Next, an intersection point between the locus curve theoretically obtained in S14 and the cut section defined in S51 is obtained (S52). Next, an outer peripheral point sequence is obtained from the intersection point group (S53). That is, (i) a 3D cross-sectional shape is converted into 2D, and (ii) a peripheral point sequence is extracted using a 2D Voronoi projection. Next, the maximum amplitude is calculated from the obtained outer peripheral point sequence (S54). This is performed by (i) obtaining a virtual center point from the outer peripheral point sequence and (ii) calculating and obtaining an amplitude amount.
[0047]
In this way, the outer peripheral point sequence and the amplitude amount are obtained for each cut section. Then, the maximum amount of amplitude obtained by calculation is compared with the maximum amplitude in actual measurement obtained in S13, and a ratio for matching this is calculated (S55). Then, the outer peripheral point sequence in each cut section is corrected with the obtained ratio. That is, based on the obtained ratio, the peripheral point sequence in each cut section is corrected proportionally (S56).
[0048]
In the W / H movable range surface definition process of S16, as shown in FIG. 6, it is examined whether it is possible to define as a circle from the distribution of the outer peripheral points for each cross section (S61). This is determined to be a circle if the outer peripheral points are distributed within ± 1 mm of the virtual radius from the virtual center. In this determination, it is determined whether the outer peripheral point sequence is determined to be circumferential (S62). If YES, the point sequence (previous point sequence) and position in the adjacent cut cross section for the circumferential point sequence. Matching is performed (S63). On the other hand, if the determination in S62 is NO, the outer peripheral point sequence is corrected so as to be a circumferential point and aligned with the previous point sequence (S64). Then, a space between the previous point sequence and the current point sequence is defined by a triangular plane, and a W / H movable range is defined (S65).
[0049]
In S17, the W / H movable range obtained in S16 is output in a predetermined format. For example, the curved surface is output to a file in IGES format or STL format.
[0050]
As described above, according to the present embodiment, the W / H movable range calculated by calculation is corrected to the maximum amplitude by the experiment performed in advance, and the amount of the experiment is relatively reduced, and the various W / H movable ranges are obtained. Effective calculation of the range is possible. Further, in calculating the W / H movable range, physical properties such as the type and thickness of the exterior are taken into consideration, and the W / H movable range can be calculated in accordance with the actual situation.
[0051]
Further, the above description is a process between one locking point, and a plurality of W / Hs are connected, and the thickness of the cable, the exterior, the locking method, and the like are different. Therefore, the entire design is performed by sequentially calculating between the locking points. Then, considering the obtained movable range, the arrangement of other members is also examined.
[0052]
【The invention's effect】
As described above, according to the present invention, the maximum amplitude amount in the movable range obtained by calculation is compared with the actually measured maximum amplitude amount, and correction is performed based on the comparison result. As a result, the physical properties and size of the linear material can be taken into consideration, and it is possible to effectively calculate the various movable ranges of W / H with a relatively small amount of experiment.
[Brief description of the drawings]
FIG. 1 is a flowchart illustrating an overall operation of processing according to an embodiment.
FIG. 2 is a flowchart for creating a table.
FIG. 3 is a flowchart for calculating a minimum bending radius.
FIG. 4 is a flowchart of maximum amplitude measurement.
FIG. 5 is a flowchart of amplitude amount correction processing;
FIG. 6 is a flowchart of a movable range surface definition process.

Claims (9)

A linear material movable range calculating device for calculating a movable range of a linear material locked by two locking portions,
The linear material is locked by two locking portions, and the maximum amplitude that is the maximum length in the direction perpendicular to the straight line connecting the locking portions is measured at a plurality of predetermined points on the linear material. Actual value storage means for storing;
When the linear material is deformed between the two locking portions based on the rigidity of the linear material, the length of the linear material, and the locking direction of the locking portion of the linear material. A movable range calculating means for calculating a movable range of the linear material;
In the movable range of the linear material calculated by the movable range calculating means, the maximum amplitude amount at the place corresponding to the predetermined point stored in the measured value storage means is obtained, and the obtained maximum amplitude amount And a correction means for correcting the movable range of the linear material from the obtained comparison result,
An apparatus for calculating a movable range of a linear material, comprising: The apparatus of claim 1.
The measured maximum amplitude is stored by classifying the linear member locking method, the type of the linear member, and the thickness of the linear member as factors. Movable range calculation device. The apparatus of claim 2.
The linear material movable range calculation device is characterized in that the measured value storage means is further classified and stored with the length between two points of the locking portion and the length of the linear material as factors. The device according to any one of claims 1 to 3,
The movable range calculating means calculates a plurality of movable trajectories deformed based on the locking direction, length, and minimum bending radius of the linear material between the locking portions,
By providing a plurality of surfaces perpendicular to the straight line connecting the locking portions according to the distance from the locking portion on the straight line, to obtain the intersection of this surface and the plurality of movable trajectories,
Obtain the outer peripheral point sequence of the intersection point in the same plane for each plane,
An apparatus for calculating a movable range of a linear material, wherein the movable range is calculated by connecting outer peripheral point sequences for a plurality of obtained surfaces. In the device according to any one of claims 1 to 4,
The linear material rigidity is a minimum bending radius of the linear material, and is obtained from the material and thickness of the linear material. The apparatus of claim 5.
The linear material is configured by bundling a plurality of individual linear materials, and the type of the linear material is a type of skin material that is packaged on the bundling of the plurality of individual linear materials. An apparatus for calculating a movable range of a linear material characterized by the following. The device according to any one of claims 1 to 6,
The linear material movable range calculating apparatus, wherein the linear material is a wire harness. A linear material movable range calculation method for calculating a movable range of a linear material locked by two locking portions,
The measured maximum amplitude of the linear material measured at a plurality of predetermined points on the linear material by locking the linear material with two locking portions and measuring the maximum amplitude in the direction perpendicular to the straight line connecting the locking portions. Store
When the linear material is deformed between the two locking portions based on the rigidity of the linear material, the length of the linear material, and the locking direction of the locking portion of the linear material. Calculate the movable range of the linear material,
In the calculated movable range of the linear material, the maximum amplitude amount at a location corresponding to the predetermined point is determined from the stored actual maximum amplitude amount,
Compare the obtained maximum amplitude amount and the measured maximum amplitude amount, correct the movable range of the linear material from the obtained comparison results,
A method for calculating a movable range of a linear material, comprising: determining a movable range of the linear material. A linear material movable range calculation program for calculating a movable range of a linear material locked by two locking portions,
On the computer,
When the linear material is deformed between the two locking portions based on the rigidity of the linear material, the length of the linear material, and the locking direction of the locking portion of the linear material. Calculate the movable range of the linear material,
The linear material is locked by two locking portions, and the maximum amplitude that is the maximum length in the direction perpendicular to the straight line connecting the locking portions is measured at a plurality of predetermined points on the linear material. From the measured value storage means for storing, the measured maximum amplitude is read out,
In the movable range of the linear material calculated by the movable range calculating means, the maximum amplitude amount at a place corresponding to the predetermined point is obtained,
Comparing the obtained maximum amplitude amount with the read actual maximum amplitude amount, and correcting the movable range of the linear material from the obtained comparison result,
A program for calculating a movable range of a linear material, wherein the corrected movable range is calculated.

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