KR20140049303A - Apparatus and method for setting contact point of curved surface structure supporting jig - Google Patents

Abstract

The present invention relates to a device and a method for setting the contact points of a curved structure supporting jigs. According to an embodiment of the present invention, the device for setting the contact points of a curved structure supporting jigs comprises: a curved line information obtaining part for obtaining information on the curved line of a curved structure supported by multiple supporting jigs which are arranged at preset intervals; a vector matrix generating part for generating a vector matrix relative to preset initial contact points between the multiple supporting jigs and the curved structure using the obtained curved line information; a tangential angle calculating part for generating a normal vector using the generated vector matrix, and calculating the tangential angel of the supporting jigs coming in contact with the curved structure using the normal vector; and a contact point correcting part for correcting the information on the initial contact points of the multiple supporting jigs using the calculated tangential angle. Accordingly, the present invention can evenly distribute the load of the curved structure by correcting the contact points between the curved structure and the multiple jigs. [Reference numerals] (210) Curved line information obtaining part; (220) Vector matrix generating part; (230) Tangential angle calculating part; (240) Contact point correcting part

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a contact point setting apparatus for a curved structure supporting jig,

The present invention relates to an apparatus for setting a contact point of a curved structure supporting jig and a setting method thereof, and more particularly to a technique for correcting a contact point between a curved structure and a supporting jig.

Generally, various types of structures are proposed in order to support the structure at a predetermined height from the ground in order to facilitate the operation when the large, heavy structure including the ship is dried. In particular, in the case of a curved surface structure forming a curved surface such as a ship, a pin jig supporting the curved surface of the lower surface is proposed. For example, such a pin jig is configured such that a hoisting bar having a plurality of pin holes formed at a predetermined interval is inserted in an upper portion of a lower column erected on the ground, and a pin hole corresponding to the pin hole of the hoisting rods So that the height of the lifting rod can be adjusted by fitting the pin hole of the lower column and the pin hole of the lifting rod with the key while lifting the lifting rod to the lower column with an antenna.

In order to support the lower surface of the curved surface structure, the pin jig elevates the elevating bar in correspondence with the lower surface of the curved surface structure so that the height of the pin jig can be adjusted to several tens to several hundreds depending on the size of the structure. It should be installed. In this case, the height of the plurality of jigs is set differently according to the design information of the curved surface structure at the beginning, and is set to support the curved surface structure. However, when the upper portion of the jig which contacts the curved structure is spherical, the position of the contact point set at the beginning and the actual contact point are different. Therefore, when the height of the support jig is set using the initial contact point information set at the time of designing, the load of the curved surface structure is concentrated on the specific jig among the plurality of support jigs.

BACKGROUND ART [0002] A technique to be a background of the present invention is disclosed in Korean Patent Laid-Open Publication No. 2000-0009521 (published on February 15, 2000).

SUMMARY OF THE INVENTION It is an object of the present invention to provide a contact point setting device for a jig for supporting a curved structure capable of evenly distributing a load of a curved surface structure by correcting contact points between a curved surface structure and a plurality of jigs .

The contact point setting device for a jig for supporting a curved structure according to an embodiment of the present invention includes a curved line information obtaining unit for obtaining curved line information of a curved surface structure supported by a plurality of supporting jigs arranged at predetermined intervals, A vector matrix generator for generating a vector matrix for the predetermined initial contact points of the plurality of support jigs and the curved surface structure using the obtained curve information, a normal vector generating unit for generating a normal vector using the generated vector matrix, A tangential angle calculating unit for calculating a tangential angle of the supporting jig in contact with the curved surface structure using a normal vector and a contact point correction unit for correcting initial contact point information of the plurality of supporting jigs using the calculated tangent angle .

The curve information obtaining unit may generate a curve equation using the initial contact point information of the plurality of support jigs, and the vector matrix generator may generate a vector matrix using a curve equation for a plurality of neighboring initial contact points. have.

In addition, the supporting jig may be formed as a support having a hemispherical top structure or a support plate disposed on the support, and may be in contact with the curved surface structure.

Also, the curve information obtaining unit may generate an x-axis curve equation and a y-axis curve equation having a height from the ground to the initial contact point as a z-axis.

The vector matrix generator may generate one characteristic curve equation using the curve equation for the neighboring plurality of initial contact points and perform numerical differentiation on the characteristic curve equation to obtain an x-axis vector matrix of each contact point and a y- You can create a matrix.

) 및 y축 벡터 매트릭스(

)를 다음의 수학식을 이용하여 구할 수 있다:In addition, the vector matrix generator may include an x-axis vector matrix (

) And y-axis vector matrices (

) Can be calculated using the following equation: < RTI ID = 0.0 >

Here, x _α is the x-axis coordinates, x _β of the initial contact point is x coordinate of the calibration point of contact, y _α is y coordinate of the initial point of contact, y _β is the y coordinate of the calibration point of contact, z _α is the initial point of contact z-axis Coordinate, z _? Represents the z-axis coordinate of the correction contact point.

)를 다음의 수학식을 이용하여 구할 수 있다:Further, the tangent angle calculating unit may calculate the tangent angle

) Can be calculated using the following equation: < RTI ID = 0.0 >

Here, x _α is the x-axis coordinates, x _β of the initial contact point is x coordinate of the calibration point of contact, y _α is y coordinate of the initial point of contact, y _β is the y coordinate of the calibration point of contact, z _α is the initial point of contact z-axis Coordinate, z _? Represents the z-axis coordinate of the correction contact point.

Further, the tangent angle calculating unit can obtain the tangent angle? By using the following equation:

Where a is the distance in the horizontal direction from the midpoint of the support of the support jig to the correction contact point and b is the distance in the vertical direction from the midpoint of the support to the correction contact point.

According to another aspect of the present invention, there is provided an apparatus for setting a contact point of a jig for supporting a curved structure, comprising: obtaining curve information for a curved surface structure supported by a plurality of supporting jigs arranged at predetermined intervals; Generating a vector matrix for the predetermined initial contact points of the plurality of support jigs and the curved surface structure using curve information, generating a normal vector using the generated vector matrix, and using the normal vector Calculating a tangential angle of the supporting jig in contact with the curved surface structure; and correcting initial contact point information of the plurality of supporting jigs by using the calculated tangent angle.

Accordingly, the load of the curved surface structure can be evenly distributed by correcting the contact points between the curved surface structure and the plurality of jigs. In addition, since the curved surface structure and the plurality of jigs are brought into surface contact with each other, the curved surface structure can be stably fixed on the jig.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exemplary view for explaining a plurality of support jigs to be contact point setting objects of a contact point setting device of a jig for supporting a curved structure according to an embodiment of the present invention;
FIG. 2 is a block diagram of a contact point setting device of a jig for supporting a curved structure according to FIG. 1. FIG.
3 is a flowchart of a contact point setting method of the contact point setting device of the jig for supporting a curved surface structure according to FIG.
4A and 4B are diagrams for explaining the correction of the contact point in the contact point setting method according to FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The terms used are terms selected in consideration of the functions in the embodiments, and the meaning of the terms may vary depending on the user, the intention or the precedent of the operator, and the like. Therefore, the meaning of the terms used in the following embodiments is defined according to the definition when specifically defined in this specification, and unless otherwise defined, it should be interpreted in a sense generally recognized by those skilled in the art.

1 is an exemplary view for explaining a plurality of supporting jigs to be contact point setting objects of a contact point setting device of a jig for supporting a curved structure according to an embodiment of the present invention.

Referring to Fig. 1, the curved surface structure 10 is supported by a plurality of supporting jigs 100 installed on the ground. In this case, the curved surface structure 10 refers to a structure having a curved surface such as a ship, an aircraft, or an automobile. The plurality of supporting jigs 100 are arranged in predetermined positions to support the lower surface of the curved structure 10. [ In this case, the height of each supporting jig 100 may be set differently according to the design information of the curved structure 10. [ In addition, the upper portion of the supporting jig 100 is formed as a support plate positioned on a support or a support having a hemispherical structure and is in contact with the curved structure 10. Since the curved surface 10 has a curved bottom surface, the initial contact point information must be corrected because the difference between the initial contact point information and the actual contact point information between the supporting jig 100 and the curved surface structure 10 occurs.

Hereinafter, the correction of the initial contact point information of the supporting jig 100 will be described in detail with reference to FIGS. 2 to 4. FIG.

FIG. 2 is a configuration diagram of a contact point setting device for a jig for supporting a curved surface structure according to FIG. 1, and FIG. 3 is a flowchart of a contact point setting method for a contact point setting device for a curved structure supporting jig according to FIG.

2 and 3, an apparatus 200 for setting a contact point of a jig for supporting a curved structure according to an exemplary embodiment of the present invention includes a curve information obtaining unit 210, a vector matrix generating unit 220, 230 and a contact point correcting unit 240.

First, the curve information obtaining unit 210 receives the initial contact point information of a plurality of supporting jigs supporting the curved surface structure at predetermined intervals (S300). In this case, the initial contact point information is information initially set at the time of designing, which means height information of each supporting jig, and is set to coincide with height information of the curved surface contacting the supporting jig. In addition, the initial contact point information includes arrangement information between a plurality of support jigs, which can be set differently by user setting.

Next, the curve information obtaining unit 210 obtains curve information of the curved surface structure (S310). Curve information is design information for a curved structure, initial design information of a curved structure may be input and stored in a database (not shown). In this case, it is preferable that the curve information of the contact surface contacting with the support jig is input.

If the curved line information obtaining unit 210 does not know the curved line information about the curved surface structure in advance, the curved line information obtaining unit 210 may generate the curved line equation for each initial point of contact using the inputted initial contact point information. In this case, the curve is used to include a spline, and may be a linear spline, a Ferguson curve, a Bezier curve, a cubic spline curve, a cardinal spline (Cardinal spline), Bezier spline (B-spline), and Nurbs (Nurbs).

Also, the curve information obtaining unit 210 can generate an x-axis curve equation and a y-axis curve equation having a z-axis height from the ground to the initial contact point. For example, the x-axis curve equation can be set to ax ² + bx + c = z _x , and the y-axis curve equation can be set to ay ² + by + c = z _y . In addition, the curve information acquisition unit 210 is the x-axis curve equation Bezier curve as ax ³ + bx ² + cx + d = z _x, y axis curve equation ay ³ + by ² + cy + d = z _y It can also be set as an equation. In this case, the curve equation can be set by applying interpolation.

Next, the vector matrix generator 220 generates a vector matrix using a curve equation for a plurality of neighboring initial contact points (S320). For example, the vector matrix generator 220 generates a characteristic curve equation using a curve equation for a plurality of neighboring initial contact points, numerically differentiates the characteristic curve equation to obtain an x-axis vector matrix of each contact point, and y Axis vector matrices.

For example, ax ₁ ² + bx ₁ + c = z _{1 for} the x-axis curve equation of the first initial contact point, ax ₂ ² + bx ₂ + c = z ₂ for the x-axis curve equation of the second initial contact point, If you set the x-axis curve equation of the initial point of contact with ^{_{ax 3 2 + bx 3 + c}} = z 3, the attribute value of the x-axis characteristic curve equation ^{(ax 2 + bx + c =} z x) for it [a, b, c] can be obtained by using the following equation (1).

The characteristic values [a, b, c] of the y-axis characteristic curve equation (ay ² + by + c = z _y ) for the first initial contact point, the second initial contact point and the third initial contact point in Equation 1 can be obtained in the same way.

The vector matrix generator 220 calculates the x-axis curve equation of the first initial contact point as ax ₁ ³ + bx ₁ ² + cx ₁ + d = z ₁ and the x-axis curve equation of the second initial contact point as ax ₂ ³ + ^{_{bx 2 2 + cx 2 + d}} = z 2, 3 the x-axis curve equation of the initial contact point ^{_{ax 3 3 + bx 3 2 +}} cx 3 + d = z 3, 4 the x-axis curve equation of the initial contact point ax _{4 ^{3 + bx 4 2 + cx 4}} + d = , if one with z ₄ set, whereby characteristic values for the x-axis characteristic curve equation (ax ³ + bx ² + cx + d = z _x) [a, b, c, d Can be obtained by using the following equation (2).

In Equation ( ² ), the characteristic value [a ( _y )] of the y-axis characteristic curve equation (ay ³ + by ² + cy + d = z _y ) for the first initial contact point, the second initial contact point, the third initial contact point, , b, c, d] can also be obtained in the same manner as in Equation (2).

) 및 y축 벡터 매트릭스(

)를 다음의 수학식 3을 이용하여 구할 수 있다.In addition, the vector matrix generating unit 220 generates the vector matrix

) And y-axis vector matrices (

) Can be obtained by using the following equation (3).

In Equation 3, x _α is the x-axis coordinates of the initial touch points, x _β is x coordinate, y _α of the correction point of contact is the y coordinate of the initial point of contact, y _β is the y coordinate, z _α is the initial point of contact of the compensation contacts And z _? Represents the z-axis coordinate of the correction contact point. Here, the correction contact point means a test contact point for finding an actual contact point.

) 및 y축 벡터 매트릭스(

)를 외적(cross product)하여 다음의 수학식 4와 같이 노멀 벡터(

)를 구할 수 있다.Next, the tangent angle arithmetic operation unit 230 generates a normal vector using the vector matrix of the contact point (S330). In this case, the tangent angle arithmetic unit 230 calculates the tangent angle matrix

) And y-axis vector matrices (

) Is cross product to obtain a normal vector (

) Can be obtained.

In Equation 4, x _α is the x-axis coordinates of the initial touch points, x _β is x coordinate, y _α of the correction point of contact is the y coordinate of the initial point of contact, y _β is the y coordinate, z _α is the initial point of contact of the compensation contacts And z _? Represents the z-axis coordinate of the correction contact point.

Next, the tangent angle calculating unit 230 calculates the tangent angle of the supporting jig in contact with the curved surface structure using the normal vector (S340). Here, the tangent angle means an angle formed between the tangent of the contact point at which the curved structure and the supporting jig are in contact with the horizontal line or between the vertical line at the center of the supporting jig and the actual contact point. For example, the tangent angle calculating unit 230 can obtain the tangent angle? Using the following equation (5).

In Equation (5), a represents the distance in the horizontal direction from the midpoint of the support of the support jig to the correction contact point, and b represents the distance in the vertical direction from the midpoint of the support to the correction contact point.

Next, the contact point correcting unit 240 corrects the initial contact point information of the plurality of supporting jigs using the tangent angle of the contact point (S350). That is, the contact point correction unit 240 can correct the position of the initial contact point using the tangential angle information with the curved surface structure. Further, the height of the initial contact point with the ground can be corrected using the tangent angle information. The contact point corrector 240 can correct the initial contact point information of the plurality of support jigs initially input. This is to evenly distribute the load of the curved structure.

4A and 4B are diagrams for explaining the correction of the contact point in the contact point setting method according to FIG. In Fig. 4, only the upper structure of the support strip is shown for convenience of explanation.

First, referring to FIG. 4A, a contact point correction method in the case where the upper structure of the supporting jig is composed of a hemispherical support 410 having a radius r. In this case, the initial contact point between the support 410 of the support jig and the curved surface structure 40 is set according to the initial design information. In this case, the height information is set based on the ground on which the support jig is installed. The initial contact point of the curved surface structure 40 and the supporting jig is?, The corrected contact point at which the height is corrected at the initial contact point? Of the supporting jig is? ', The actual contact point is corrected at the correction contact point? And the contact point is set to?. In this case, the initial contact point a and the correction contact point beta 'are located on the vertical line of the center O of the support 410. Further, the correction contact point beta 'is set to the highest point of the surface of the support 410. [

On the other hand, due to the structural characteristics of the curved surface structure 40 and the retainer 410, the contact is not actually made at the initial contact point?. Therefore, in order to maintain the initial contact point alpha height of the curved surface structure 40, the height of the supporting jig must be corrected. To this end, the tangent angle?, Which is the angle of the actual contact point?, Is calculated based on the vertical line to the center O of the support member 410, and the height of the support jig can be corrected using this. That is, the first height H from the ground to the initial contact point? Of the curved structure 40 is corrected to the second height H ', which is the distance to the correction contact point?' Of the support 410 .

For example, using a right triangle connecting the initial contact point? Of the curved surface structure 40, the center O of the support 410 and the correction contact point? 'Of the support 410, cos? = R / (r + p), and the difference p between the first height H and the second height H 'can be obtained using the equation p = (r / cos?) - r. Therefore, the position of the correction contact point? 'Of the support 410 is determined by correcting the initial contact point? Of the support 410 by p. Thus, the height of the initial contact point? Of the curved surface structure 40 can be maintained.

Referring to FIG. 4B, the upper structure of the support jig shows a contact point correction method in a case where a support plate 420 having a height q is formed on a hemispherical support 410 having a radius r. In this case, the initial contact point between the support plate 420 of the support jig and the curved surface structure 40 is set according to the initial design information. In this case, the height information is set based on the ground on which the support jig is installed. The initial contact point of the curved surface structure 40 and the supporting jig is?, The corrected contact point at which the height is corrected at the initial contact point? Of the supporting jig is? ', The actual contact point is corrected at the correction contact point? And the contact point is set to?. In this case, the initial contact point a and the correction contact point beta 'are located on the vertical line of the center O of the support 410. Further, the correction contact point beta 'is set in a state in which the support plate 420 is horizontal.

Even when the support structure 420 rotatable on the support 410 is positioned on the upper structure of the support jig, the contact is not made at the initial contact point?. Therefore, the height of the support jig must be corrected as shown in FIG. 4A. For example, using a right triangle connecting the initial contact point? Of the curved surface structure 40, the center O of the support 410 and the correction contact point? 'Of the support 410, cos? = R '/ (r' + p), and the difference p between the first height H and the second height H 'can be obtained using the equation p = (r' / cos?) - r ' have. In this case, r '= r + q is set. Therefore, the position of the correction contact point beta 'of the support plate 420 is determined by correcting the initial contact point? Of the support 410 by p. Accordingly, the height of the initial contact point? With respect to the curved surface structure 40 can be maintained, and the curved surface structure 40 and the support plate 420 can be in surface contact with each other.

Meanwhile, the embodiments of the present invention can be embodied as computer readable codes on a computer readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored.

Examples of the computer-readable recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device and the like, and also a carrier wave (for example, transmission via the Internet) . In addition, the computer-readable recording medium may be distributed over network-connected computer systems so that computer readable codes can be stored and executed in a distributed manner. And functional programs, codes, and code segments for implementing the present invention can be easily deduced by programmers skilled in the art to which the present invention pertains.

As described above, according to the embodiment of the present invention, the load of the curved structure can be evenly distributed by correcting the contact points between the curved structure and the plurality of jigs. In addition, since the curved surface structure and the plurality of jigs are brought into surface contact with each other, the curved surface structure can be stably fixed on the jig.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, Therefore, the present invention should be construed as a description of the claims which are intended to cover obvious variations that can be derived from the described embodiments.

10, 40: Curved structure
100: support jig
200: contact point setting device
210: Curve information acquisition unit
220: vector matrix generator
230: Tangential angle arithmetic unit
240: contact point correction section
410: District
420: Support plate

Claims (16)

A curve information acquiring unit for acquiring curve information for a curved surface structure supported by a plurality of supporting jigs arranged at predetermined intervals;
A vector matrix generator for generating vector matrices for the predetermined initial contact points of the plurality of support jigs and the curved surface structure using the obtained curve information;
A tangential angle calculating unit for generating a normal vector using the generated vector matrix and calculating a tangential angle of the supporting jig in contact with the curved surface structure using the normal vector; And
And a contact point correction unit for correcting the initial contact point information of the plurality of support jigs by using the calculated tangent angle. The method of claim 1,
Wherein the curve information obtaining unit comprises:
A curve equation is generated using initial contact point information of the plurality of support jigs,
Wherein the vector matrix generator comprises:
An apparatus for setting a contact point of a jig for supporting a curved structure for generating a vector matrix using a curve equation for a plurality of neighboring initial contact points. The method of claim 1,
The supporting jig includes:
Wherein the upper structure is formed as a hemispherical support or a support plate positioned on the support, and the contact point setting device of the jig for supporting a curved structure contacting the curved structure. The method of claim 1,
Wherein the curve information obtaining unit comprises:
Axis curvature equation with the height from the ground to the initial contact point as the z-axis, and a y-axis curve equation. The method of claim 1,
Wherein the vector matrix generator comprises:
Generating a characteristic curve equation using the curve equations for the neighboring plurality of initial contact points and generating a x-axis vector matrix and a y-axis vector matrix of each contact point by numerically differentiating the characteristic curve equation; Contact point setting device of jig. 6. The method of claim 5,
Wherein the vector matrix generator comprises:
The x-axis vector matrix (

) And y-axis vector matrices (

) Of a jig for supporting a curved structure is obtained by using the following equation:

Here, x _α is the x-axis coordinates, x _β of the initial contact point is x coordinate of the calibration point of contact, y _α is y coordinate of the initial point of contact, y _β is the y coordinate of the calibration point of contact, z _α is the initial point of contact z-axis Coordinate, z _? Represents the z-axis coordinate of the correction contact point. The method according to claim 6,
The tangential angle calculating unit
The normal vector (

) Of a jig for supporting a curved structure is obtained by using the following equation:

Here, x _α is the x-axis coordinates, x _β of the initial contact point is x coordinate of the calibration point of contact, y _α is y coordinate of the initial point of contact, y _β is the y coordinate of the calibration point of contact, z _α is the initial point of contact z-axis Coordinate, z _? Represents the z-axis coordinate of the correction contact point. 8. The method of claim 7,
The tangential angle calculating unit
The contact point setting device of a jig for supporting a curved structure obtained by using the following equation:

Where a is the distance in the horizontal direction from the midpoint of the support of the support jig to the correction contact point and b is the distance in the vertical direction from the midpoint of the support to the correction contact point. A contact point setting method of a contact point setting apparatus for a jig for supporting a curved structure,
Obtaining curve information for a curved surface structure supported by a plurality of supporting jigs arranged at predetermined intervals;
Generating a vector matrix for the predetermined initial contact points of the plurality of support jigs and the curved surface structure using the obtained curve information;
Generating a normal vector using the generated vector matrix and calculating a tangential angle of the support jig in contact with the curved surface structure using the normal vector; And
And correcting the initial contact point information of the plurality of support jigs by using the calculated tangent angles. 10. The method of claim 9,
Wherein the obtaining of the curve information comprises:
A curve equation is generated using initial contact point information of the plurality of support jigs,
Wherein generating the vector matrix comprises:
A method of establishing a contact point of a jig for supporting a curved structure that generates a vector matrix using curvilinear equations for a plurality of neighboring initial contact points. 10. The method of claim 9,
The supporting jig includes:
Wherein the upper structure is formed as a hemispherical support or a support plate positioned on the support to contact the curved structure. 10. The method of claim 9,
Wherein the obtaining of the curve information comprises:
Axis curvature equation in which the height from the ground to the initial contact point is the z-axis, and the y-axis curve equation. 10. The method of claim 9,
Wherein generating the vector matrix comprises:
Generating a characteristic curve equation using the curve equations for the neighboring plurality of initial contact points and generating a x-axis vector matrix and a y-axis vector matrix of each contact point by numerically differentiating the characteristic curve equation; How to set contact point of jig. 14. The method of claim 13,
Wherein generating the vector matrix comprises:
The x-axis vector matrix (

) And y-axis vector matrices (

) Of a jig for supporting a curved structure is obtained by using the following equation:

Here, x _α is the x-axis coordinates, x _β of the initial contact point is x coordinate of the calibration point of contact, y _α is y coordinate of the initial point of contact, y _β is the y coordinate of the calibration point of contact, z _α is the initial point of contact z-axis Coordinate, z _? Represents the z-axis coordinate of the correction contact point. 15. The method of claim 14,
Wherein the step of calculating the tangent angle comprises:
The normal vector (

) Of a jig for supporting a curved structure is obtained by using the following equation:

Here, x _α is the x-axis coordinates, x _β of the initial contact point is x coordinate of the calibration point of contact, y _α is y coordinate of the initial point of contact, y _β is the y coordinate of the calibration point of contact, z _α is the initial point of contact z-axis Coordinate, z _? Represents the z-axis coordinate of the correction contact point. 16. The method of claim 15,
Wherein the step of calculating the tangent angle comprises:
The contact point setting method of a jig for supporting a curved structure obtained by using the following equation:

Where a is the distance in the horizontal direction from the midpoint of the support of the support jig to the correction contact point and b is the distance in the vertical direction from the midpoint of the support to the correction contact point.

Images