Construction method of three-dimensional model of ship cross beam panel

Abstract

The invention relates to a method for constructing a three-dimensional model of a ship cross beam panel. The method comprises the steps that coordinates of a center point are obtained, a two-dimensional coordinate system with the center point as an original point is established, the center point is used as an original point of a unified coordinate system, accumulated errors during assembly of multiple components are avoided, and actually measured data show that the assembly matching degree is improved; a mathematical model which is located in a two-dimensional coordinate system, contains variable parameters and is related to a product boundary line is obtained, rapid generation of the boundary line is achieved through the variable parameterization mathematical model, global updating can be achieved only by adjusting the parameters during modification, and the design efficiency is greatly improved; obtaining a specific value of a variable parameter, and substituting the specific value into the mathematical model to obtain a two-dimensional boundary line of the product; the thickness value of the product is obtained, the thickness value of the two-dimensional boundary line of the product is stretched in the thickness direction, automatic conversion from two dimensions to three dimensions is achieved through stretching in the thickness direction, and a mechanical three-dimensional model is obtained.

Description

Technical Field

[0001] This invention relates to the field of ship design and manufacturing technology, and more specifically, to a method for constructing a three-dimensional model of a ship's crossbeam panel. Background Technology

[0002] As a load-bearing component in the structure of a roll-on / roll-off car carrier, the crossbeam panel plays a crucial role in the overall performance and safety of the vessel. The structure and shape of the crossbeam panel are typically quite complex; for example, a 8600CEU roll-on / roll-off car carrier requires modeling 652 crossbeam panels.

[0003] Currently, the main problems in modeling the crossbeam panels of roll-on / roll-off car carriers are as follows: 1. Low modeling efficiency: Traditional manual modeling methods require drawing complex 3D models one by one, involving a large number of detailed designs, which consumes a lot of time and manpower. 2. Poor model consistency: Different designers may have different habits and understandings when modeling, which may affect the consistency and accuracy of the models, making subsequent design modifications and optimizations difficult. 3. Difficulty in parameter optimization design: Traditional modeling methods are difficult to quickly achieve the adjustment and optimization of different design parameters (such as thickness, shape and size) of the crossbeam panels.

[0004] Therefore, an efficient, accurate, and flexible parametric modeling method for PCTC crossbeam panels is needed to meet the requirements of ship design and manufacturing. Summary of the Invention

[0005] This application provides a method for constructing a three-dimensional model of a ship's crossbeam panel to solve the problems of low efficiency, poor consistency, and difficulty in parameter optimization design in existing modeling methods.

[0006] This application provides a method for constructing a three-dimensional model of a ship's crossbeam panel, comprising: obtaining the coordinates of the center point and establishing a two-dimensional coordinate system with the center point as the origin; obtaining a mathematical model containing variable parameters about the product boundary line located in the two-dimensional coordinate system; obtaining the specific values ​​of the variable parameters and substituting the specific values ​​into the mathematical model to obtain the two-dimensional boundary line of the product; obtaining the thickness value of the product and stretching the two-dimensional boundary line of the product in the thickness direction to obtain a mechanical three-dimensional model.

[0007] In some optional embodiments, the two-dimensional boundary line of the product includes a first boundary line located in the first quadrant of the two-dimensional coordinate system. The first boundary line includes a first arc curve, a first straight line, and a second straight line. The first straight line is tangent to the starting point of the first arc curve, and the second straight line is tangent to the ending point of the first arc curve.

[0008] In some optional embodiments, the mathematical model of the first arc curve is:

[0009]

[0010] In the first arc curve, all points satisfy x>0 and y>0; the center coordinates (a,b) and radius r satisfy a≥r and b≥r; α and β are the starting angle and ending angle of the arc, respectively; the starting point coordinates when θ equals α are (x1,y1); and the ending point coordinates when θ equals β are (x2,y2).

[0011] The mathematical model of the first straight line is:

[0012]

[0013] Where m1 is the slope of the tangent line at the starting point (x1, y1);

[0014] The mathematical model of the second straight line is

[0015] y = m²x + (y² - m²x²)

[0016] Where m2 is the slope of the tangent line at the endpoint (x2, y2).

[0017] In some optional embodiments, the two-dimensional boundary line of the product includes a second boundary line located in the second quadrant of the two-dimensional coordinate system. The second boundary line includes a second arc curve, a third straight line, and a fourth straight line. The third straight line is tangent to the starting point of the second arc curve, and the fourth straight line is tangent to the ending point of the second arc curve.

[0018] In some optional embodiments, the mathematical model of the second arc curve is:

[0019]

[0020] In the second arc curve, all points satisfy x<0 and y>0, the center coordinates (a,b) and radius r satisfy a≤-r and b≥r, α and β are the starting angle and ending angle of the arc, respectively, the starting point coordinates when θ equals α are (x3,y3), and the ending point coordinates when θ equals β are (x4,y4).

[0021] The mathematical model of the third straight line is:

[0022] y - y³ = m³(x - x³)

[0023]

[0024] Where m3 is the slope of the tangent line at the starting point (x3, y3);

[0025] The mathematical model of the fourth straight line is:

[0026] y - y4 = m4(x - x4)

[0027]

[0028] Where m4 is the slope of the tangent line at the endpoint (x4, y4).

[0029] In some optional embodiments, the two-dimensional boundary line of the product includes a third boundary line located in the third quadrant of the two-dimensional coordinate system. The third boundary line includes a third arc curve, a fifth straight line, and a sixth straight line. The fifth straight line is tangent to the starting point of the third arc curve, and the sixth straight line is tangent to the ending point of the third arc curve.

[0030] In some optional embodiments, the mathematical model of the third arc curve is:

[0031]

[0032] In the third arc curve, all points satisfy x<0 and y<0, the center coordinates (a, b) and radius r satisfy a≤-r, b≤-r, r>0, α and β are the starting angle and ending angle of the arc, respectively, the starting point coordinates when θ equals α are (x5, y5), and the starting point coordinates when θ equals β are (x6, y6).

[0033] The mathematical model of the fifth straight line is:

[0034] y = y⁵ = m⁵(x - x⁵)

[0035]

[0036] Where m5 is the slope of the tangent line at the starting point (x5, y5);

[0037] The mathematical model of the sixth line is:

[0038] y - y6 = m6(x - x6)

[0039] Where m6 is the slope of the tangent line at the starting point (x6, y6).

[0040] In some optional embodiments, the two-dimensional boundary line of the product includes a fourth boundary line located in the fourth quadrant of the two-dimensional coordinate system. The third boundary line includes a fourth arc curve, a seventh straight line, and an eighth straight line. The seventh straight line is tangent to the starting point of the fourth arc curve, and the eighth straight line is tangent to the ending point of the fourth arc curve.

[0041] In some optional embodiments, the mathematical model of the fourth arc curve is:

[0042]

[0043] In the third arc curve, all points satisfy x>0 and y<0, the center coordinates (a, b) and radius r satisfy a≥r, b≤-r, r>0, α and β are the starting angle and ending angle of the arc, respectively, the starting point coordinates when θ equals α are (x7, y7), and the starting point coordinates when θ equals β are (x8, y8).

[0044] The mathematical model of the seventh line is as follows:

[0045] y - y7 = m7(x - x7)

[0046]

[0047] Where m7 is the slope of the tangent line at the starting point (x7, y7);

[0048] The mathematical model of the eighth straight line is:

[0049] y - y8 = m8(x - x8)

[0050] Where m8 is the slope of the tangent line at the starting point (x8, y8).

[0051] In some optional embodiments, the two-dimensional boundary lines of the product include a ninth line, a tenth line, an eleventh line, and a twelfth line. The ninth line connects the first boundary line and the second boundary line. The tenth line connects the second boundary line and the third boundary line. The eleventh line connects the third boundary line and the fourth boundary line. The twelfth line connects the fourth boundary line and the first boundary line. The mathematical model of the ninth line is y = y2 = y3. The mathematical model of the tenth line is x = x4 = x5. The mathematical model of the eleventh line is y = y6 = y7. The mathematical models of the eleventh line are x = x8 = x1.

[0052] Compared with the prior art, the present invention has the following technical advantages:

[0053] This application provides a method for constructing a three-dimensional model of a ship's crossbeam panel, including: obtaining the coordinates of the center point, establishing a two-dimensional coordinate system with the center point as the origin, using the center point as the origin of a unified coordinate system to avoid cumulative errors during the assembly of multiple components, and experimental data showing improved assembly matching; obtaining a mathematical model of the product boundary line containing variable parameters in the two-dimensional coordinate system, achieving rapid generation of the boundary line through variable parameterization of the mathematical model, and globally updating the model by adjusting the parameters during modification, significantly improving design efficiency; obtaining the specific values ​​of the variable parameters, substituting the specific values ​​into the mathematical model to obtain the two-dimensional boundary line of the product; obtaining the thickness value of the product, stretching the thickness value of the two-dimensional boundary line of the product in the thickness direction, and achieving automatic conversion from two-dimensional to three-dimensional to obtain a mechanical three-dimensional model. Attached Figure Description

[0054] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0055] Figure 1 A flowchart illustrating the method for constructing a three-dimensional model of a ship's crossbeam panel provided in an embodiment of the present invention;

[0056] Figure 2 A schematic diagram of the two-dimensional boundary lines of the crossbeam panel provided in the embodiment.

[0057] Figure reference numerals: 11-First straight line; 12-First arc curve; 13-Second straight line; 21-Third straight line; 22-Second arc curve; 23-Fourth straight line; 31-Fifth straight line; 32-Third arc curve; 33-Sixth straight line; 41-Seventh straight line; 42-Fourth arc curve; 43-Eighth straight line; 51-Ninth straight line; 52-Tenth straight line; 53-Eleventh straight line; 54-Twelfth straight line. Detailed Implementation

[0058] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0059] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0060] With the increasing trade in automobiles, the demand for Ro-Ro car carriers, as specialized vessels for transporting cars and other vehicles, is constantly growing. The crossbeam panels of Ro-Ro car carriers, as load-bearing components in the ship's structure, play a crucial role in the overall performance and safety of the vessel. The structure and shape of the crossbeam panels are typically quite complex; taking an 8600CEU Ro-Ro car carrier as an example, a total of 652 crossbeam panels need to be modeled.

[0061] Currently, the main problems in modeling the crossbeam panels of roll-on / roll-off car carriers are as follows: 1. Low modeling efficiency: Traditional manual modeling methods require drawing complex 3D models one by one, involving a large number of detailed designs, which consumes a lot of time and manpower. 2. Poor model consistency: Different designers may have different habits and understandings when modeling, which may affect the consistency and accuracy of the models, making subsequent design modifications and optimizations difficult. 3. Difficulty in parameter optimization design: Traditional modeling methods are difficult to quickly achieve the adjustment and optimization of different design parameters (such as thickness, shape and size) of the crossbeam panels.

[0062] Therefore, an efficient, accurate, and flexible parametric modeling method for the crossbeam panels of roll-on / roll-off car carriers is needed to meet the requirements of ship design and manufacturing. The following explanation, in conjunction with the accompanying drawings, illustrates this method. Figure 1 and Figure 2 A detailed explanation will be provided.

[0063] This application provides a method for constructing a three-dimensional model of a ship's crossbeam panel to solve the problems of low efficiency, poor consistency, and difficulty in parameter optimization design in existing modeling methods.

[0064] This application provides a method for constructing a three-dimensional model of a ship's crossbeam panel, including: obtaining the coordinates of the center point and establishing a two-dimensional coordinate system with the center point as the origin; obtaining a mathematical model containing variable parameters about the product boundary line located in the two-dimensional coordinate system; obtaining the specific values ​​of the variable parameters and substituting the specific values ​​into the mathematical model to obtain the two-dimensional boundary line of the product; obtaining the thickness value of the product and stretching the two-dimensional boundary line of the product in the thickness direction to obtain a mechanical three-dimensional model.

[0065] Specifically, the coordinates of the center point are obtained, and a two-dimensional coordinate system with the center point as the origin is established. Using the center point as the origin of the unified coordinate system avoids the cumulative error during the assembly of multiple parts, and the measured data shows that the assembly matching degree is improved. A mathematical model of the product boundary line containing variable parameters is obtained in the two-dimensional coordinate system. The boundary line is quickly generated by parameterizing the mathematical model. When modifying, only the parameters need to be adjusted for a global update, which greatly improves the design efficiency. The specific values ​​of the variable parameters are obtained and substituted into the mathematical model to obtain the two-dimensional boundary line of the product. The thickness value of the product is obtained, and the thickness value is stretched in the thickness direction of the two-dimensional boundary line of the product. The thickness direction stretching realizes the automatic conversion from two-dimensional to three-dimensional, resulting in a mechanical three-dimensional model.

[0066] Furthermore, before establishing the 3D model, it is necessary to collect and analyze the relevant design requirements and specifications for the crossbeam panels of roll-on / roll-off car carriers, and determine the variable parameters of the crossbeam panels, including their thickness, length, width, height, and the radius of the curved line segments. The determined general basic parameters of the crossbeam panels are then used to construct the relationship between these basic and variable parameters through a mathematical model, thereby establishing the dimensional and positional relationships of the product's 2D boundary lines.

[0067] In some optional embodiments, the two-dimensional boundary line of the product includes a first boundary line located in the first quadrant of the two-dimensional coordinate system. The first boundary line includes a first arc curve 12, a first straight line 11, and a second straight line 13. The first straight line 11 is tangent to the starting point of the first arc curve 12, and the second straight line 13 is tangent to the ending point of the first arc curve 12.

[0068] In some optional embodiments, the mathematical model of the first arc curve 12 is as follows:

[0069]

[0070] In the first arc curve 12, all points satisfy x>0 and y>0; the center coordinates (a,b) and radius r satisfy a≥r and b≥r; α and β are the starting angle and ending angle of the arc, respectively; the starting point coordinates when θ equals α are (x1,y1); and the ending point coordinates when θ equals β are (x2,y2). The mathematical model of the first straight line 11 is:

[0071] y = m1x + (y1 - m1x1)

[0072]

[0073] Where m1 is the slope of the tangent line at the starting point (x1, y1);

[0074] The mathematical model of the second line 13 is:

[0075] y = m²x + (y² - m²x²)

[0076] Where m2 is the slope of the tangent line at the endpoint (x2, y2).

[0077] In some optional embodiments, the two-dimensional boundary line of the product includes a second boundary line located in the second quadrant of the two-dimensional coordinate system. The second boundary line includes a second arc curve 22, a third straight line 21, and a fourth straight line 23. The third straight line 21 is tangent to the starting point of the second arc curve 22, and the fourth straight line 23 is tangent to the ending point of the second arc curve 22.

[0078] In some optional embodiments, the mathematical model of the second arc curve 22 is as follows:

[0079]

[0080] In the second arc curve 22, all points satisfy x<0 and y>0, the center coordinates (a,b) and radius r satisfy a≤-r and b≥r, α and β are the starting angle and ending angle of the arc respectively, the starting point coordinates when θ equals α are (x3,y3), and the ending point coordinates when θ equals β are (x4,y4).

[0081] The mathematical model of the third line 21 is:

[0082] y - y³ = m³(x - x³)

[0083]

[0084] Where m3 is the slope of the tangent line at the starting point (x3, y3);

[0085] The mathematical model of the fourth line 23 is:

[0086] y - y4 = m4(x - x4)

[0087]

[0088] Where m4 is the slope of the tangent line at the endpoint (x4, y4).

[0089] In some optional embodiments, the two-dimensional boundary line of the product includes a third boundary line located in the third quadrant of the two-dimensional coordinate system. The third boundary line includes a third arc curve 32, a fifth straight line 31, and a sixth straight line 33. The fifth straight line 31 is tangent to the starting point of the third arc curve 32, and the sixth straight line 33 is tangent to the ending point of the third arc curve 32.

[0090] In some optional embodiments, the mathematical model of the third arc curve 32 is as follows:

[0091]

[0092] In the third arc curve 32, all points satisfy x<0 and y<0, the center coordinates (a, b) and radius r satisfy a≤-r, b≤-r, r>0, α and β are the starting angle and ending angle of the arc, respectively, the starting point coordinates when θ equals α are (x5, y5), and the starting point coordinates when θ equals β are (x6, y6).

[0093] The mathematical model of the fifth line 31 is:

[0094] y - y5 = m5(x - x5)

[0095]

[0096] Where m5 is the slope of the tangent line at the starting point (x5, y5);

[0097] The mathematical model of the sixth line 33 is:

[0098] y - y6 = m6(x - x6)

[0099]

[0100] Where m6 is the slope of the tangent line at the starting point (x6, y6).

[0101] In some optional embodiments, the two-dimensional boundary line of the product includes a fourth boundary line located in the fourth quadrant of the two-dimensional coordinate system. The third boundary line includes a fourth arc curve 42, a seventh straight line 41, and an eighth straight line 43. The seventh straight line 41 is tangent to the starting point of the fourth arc curve 42, and the eighth straight line 43 is tangent to the ending point of the fourth arc curve 42.

[0102] In some optional embodiments, the mathematical model of the fourth arc curve 42 is:

[0103]

[0104] In the third arc curve 32, all points satisfy x>0 and y<0, the center coordinates (a, b) and radius r satisfy a≥r, b≤-r, r>0, α and β are the starting angle and ending angle of the arc, respectively, the starting point coordinates when θ equals α are (x7, y7), and the starting point coordinates when θ equals β are (x8, y8).

[0105] The mathematical model of the seventh line 41 is:

[0106] y - y7 = m7(x - x7)

[0107]

[0108] Where m7 is the slope of the tangent line at the starting point (x7, y7);

[0109] The mathematical model of the eighth line 43 is:

[0110] y - y8 = m8(x - x8)

[0111]

[0112] Where m8 is the slope of the tangent line at the starting point (x8, y8).

[0113] In some optional embodiments, the two-dimensional boundary lines of the product include a ninth straight line 51, a tenth straight line 52, an eleventh straight line 53, and a twelfth straight line 54. The ninth straight line 51 connects the first boundary line and the second boundary line, the tenth straight line 52 connects the second boundary line and the third boundary line, the eleventh straight line 53 connects the third boundary line and the fourth boundary line, and the twelfth straight line 54 connects the fourth boundary line and the first boundary line. The mathematical model of the ninth straight line 51 is y = y2 = y3, the mathematical model of the tenth straight line 52 is x = x4 = x5, and the mathematical model of the eleventh straight line 53 is y = y6 = y7, x = x8 = x1.

[0114] Specifically, the ninth straight line 51 constitutes the boundary of the product two-dimensional diagram, the tenth straight line 52 constitutes the boundary of the product two-dimensional diagram, the eleventh straight line 53 constitutes the boundary of the product two-dimensional diagram, and the twelfth straight line 54 constitutes the boundary of the product two-dimensional diagram.

[0115] In this invention, the term "multiple" refers to at least two or more, unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0116] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0117] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for constructing a three-dimensional model of a ship's crossbeam deck, characterized in that, include: Obtain the coordinates of the center point and establish a two-dimensional coordinate system with the center point as the origin; Obtain a mathematical model of the product boundary line containing variable parameters in a two-dimensional coordinate system; Obtain the specific values ​​of the variable parameters, substitute these values ​​into the mathematical model, and obtain the two-dimensional boundary line of the product: Obtain the thickness value of the product, and stretch the product's two-dimensional boundary line in the thickness direction to obtain the thickness value, thereby obtaining a mechanical three-dimensional model.

2. The method for constructing a three-dimensional model of a ship's crossbeam panel according to claim 1, characterized in that, The product's two-dimensional boundary line includes a first boundary line located in the first quadrant of the two-dimensional coordinate system. The first boundary line includes a first arc curve, a first straight line, and a second straight line. The first straight line is tangent to the starting point of the first arc curve, and the second straight line is tangent to the ending point of the first arc curve.

3. The method for constructing a three-dimensional model of a ship's crossbeam panel according to claim 2, characterized in that, The mathematical model of the first arc curve is In the first arc curve, all points satisfy x>0 and y>0; the center coordinates (a,b) and radius r satisfy a≥r and b≥r; α and β are the starting angle and ending angle of the arc, respectively; the starting point coordinates when θ equals α are (x1,y1); and the ending point coordinates when θ equals β are (x2,y2). The mathematical model of the first straight line is: y = m1x + (y1 - m1x1) Where m1 is the slope of the tangent line at the starting point (x1, y1); The mathematical model of the second straight line is y = m²x + (y² - m²x²) Where m2 is the slope of the tangent line at the endpoint (x2, y2).

4. The method for constructing a three-dimensional model of a ship's crossbeam panel according to claim 1, characterized in that, The product's two-dimensional boundary line includes a second boundary line located in the second quadrant of the two-dimensional coordinate system. The second boundary line includes a second arc curve, a third straight line, and a fourth straight line. The third straight line is tangent to the starting point of the second arc curve, and the fourth straight line is tangent to the ending point of the second arc curve.

5. The method for constructing a three-dimensional model of a ship's crossbeam panel according to claim 4, characterized in that, The mathematical model of the second arc curve is In the second arc curve, all points satisfy x<0 and y>0, the center coordinates (a,b) and radius r satisfy a≤-r and b≥r, α and β are the starting angle and ending angle of the arc, respectively, the starting point coordinates when θ equals α are (x3,y3), and the ending point coordinates when θ equals β are (x4,y4). The mathematical model of the third straight line is: y - y³ = m³(x - x³) Where m3 is the slope of the tangent line at the starting point (x3, y3); The mathematical model of the fourth straight line is: y - y4 = m4(x - x4) Where m4 is the slope of the tangent line at the endpoint (x4, y4).

6. The method for constructing a three-dimensional model of a ship's crossbeam panel according to claim 1, characterized in that, The product's two-dimensional boundary line includes a third boundary line located in the third quadrant of the two-dimensional coordinate system. The third boundary line includes a third arc curve, a fifth straight line, and a sixth straight line. The fifth straight line is tangent to the starting point of the third arc curve, and the sixth straight line is tangent to the ending point of the third arc curve.

7. The method for constructing a three-dimensional model of a ship's crossbeam panel according to claim 6, characterized in that, The mathematical model of the third arc curve is as follows: In the third arc curve, all points satisfy x<0 and y<0, the center coordinates (a, b) and radius r satisfy a≤-r, b≤-r, r>0, α and β are the starting angle and ending angle of the arc, respectively, the starting point coordinates when θ equals α are (x5, y5), and the starting point coordinates when θ equals β are (x6, y6). The mathematical model of the fifth straight line is: y - y5 = m5(x - x5) Where m5 is the slope of the tangent line at the starting point (x5, y5); The mathematical model of the sixth line is: y - y6 = m6(x - x6) Where m6 is the slope of the tangent line at the starting point (x6, y6).

8. The method for constructing a three-dimensional model of a ship's crossbeam panel according to claim 7, characterized in that, The product's two-dimensional boundary line includes a fourth boundary line located in the fourth quadrant of the two-dimensional coordinate system. The third boundary line includes a fourth arc curve, a seventh straight line, and an eighth straight line. The seventh straight line is tangent to the starting point of the fourth arc curve, and the eighth straight line is tangent to the ending point of the fourth arc curve.

9. The method for constructing a three-dimensional model of a ship's crossbeam panel according to claim 8, characterized in that, The mathematical model of the fourth arc curve is as follows: In the third arc curve, all points satisfy x>0 and y<0, the center coordinates (a, b) and radius r satisfy a≥r, b≤-r, r>0, α and β are the starting angle and ending angle of the arc, respectively, the starting point coordinates when θ equals α are (x7, y7), and the starting point coordinates when θ equals β are (x8, y8). The mathematical model of the seventh line is as follows: y - y7 = m7(x - x7) Where m7 is the slope of the tangent line at the starting point (x7, y7); The mathematical model of the eighth straight line is: y - y8 = m8(x - x8) Where m8 is the slope of the tangent line at the starting point (x8, y8).

10. The method for constructing a three-dimensional model of a ship's crossbeam panel according to claim 1, characterized in that, The two-dimensional boundary lines of the product include a ninth line, a tenth line, an eleventh line, and a twelfth line. The ninth line connects the first boundary line and the second boundary line. The tenth line connects the second boundary line and the third boundary line. The eleventh line connects the third boundary line and the fourth boundary line. The twelfth line connects the fourth boundary line and the first boundary line. The mathematical model of the ninth line is y = y2 = y3. The mathematical model of the tenth line is x = x4 = x5. The mathematical model of the eleventh line is y = y6 = y7.

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