A lofting method of a circular-arc side pusher guide vane
Patent Information
- Application Number
- CN202611276242.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-21
- Publication Date
- 2026-11-03
AI Technical Summary
Traditional lofting methods are inefficient in handling smooth transitions between the guide vanes and the hull plating and side thrust cylinders, and it is difficult to ensure the smoothness of the transition, which affects the hull's aesthetics and hydrodynamic performance.
By measuring the angle between the hull plating and the side thrust cylinder, the arc radius of the guide vane's arc-shaped section is assigned to each radial section using a positive correlation rule, and a three-dimensional surface model of the guide vane is constructed to ensure a smooth transition.
It achieves an adaptive and smooth transition between the deflector and the hull body, improves the layout accuracy and processing quality, simplifies the design process, and ensures a smooth connection between the deflector and the hull body.
Smart Images
Figure CN123025905A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of shipbuilding technology, and in particular to a method for laying out an arc-shaped side thruster. Background Technology
[0002] A sidestriker is a special device installed below the waterline at the bow or stern of a vessel to improve its maneuverability and precisely maintain its position. It is widely used in engineering vessels, ferries, and other ship types. In a sidestriker, the thrust cylinder is typically connected to the hull hull via a guide plate. The thrust cylinder, guide plate, and the connected hull hull together constitute the thruster component. For better flow guidance, some guide plates have an arc-shaped cross-section that smoothly connects to both the hull hull and the thrust cylinder, forming a hyperboloid plate. This hyperboloid plate requires extremely high smoothness, unfolding accuracy, and machining quality. Insufficient unfolding accuracy often results in problems that affect the hull's aesthetics and hydrodynamic performance, making it a challenging aspect of ship lofting design.
[0003] In traditional layout processes, design institutes typically only provide a rough projection of the deflector's outer opening, as well as transverse and longitudinal sectional views of the thruster components. The transverse and longitudinal sectional views of the thruster components are two cross-sectional views along the thruster cylinder's axial direction and perpendicular to it. These views show the cross-sectional shape of the deflector at the corresponding locations—the outline of a smooth transition from both sides of the thruster cylinder to the hull plating via arc-shaped cross-sections, with the radius of each arc-shaped cross-section indicated, providing a total of four known radii. However, with only these four known radii, the cross-sectional shape of the deflector at four specific locations can only be determined. The cross-sectional shape of the deflector at other locations around the thruster cylinder needs to be calculated and determined by the layout designers based on the three-dimensional shape of the hull plating and the geometric characteristics of the thruster cylinder. In the actual structure, the shape of the hull plating along the circumference of the thrust cylinder is irregular, and the radius of curvature required for the guide vanes in different parts is different. At the location where the opening angle between the hull plating and the thrust cylinder is large, a larger radius of curvature is required to achieve a smooth transition; at the location where the opening angle is small, only a smaller radius of curvature is required.
[0004] Traditional lofting methods for this problem typically rely on the designer's experience, manually adjusting the radius of curvature of the guide vane section at each cross-section in 3D software, and repeatedly trying to achieve a smooth surface for the guide vane. This method lacks a means to establish a quantitative correlation between the geometric relationship between the hull plating and the thrust cylinder and the radius of curvature. This process is time-consuming, inefficient, and the smoothness of the final guide vane surface is difficult to guarantee, often resulting in an uneven transition at the connection between the guide vane and the hull plating, which in turn affects subsequent development accuracy and machining quality. Summary of the Invention
[0005] The technical problem to be solved by the present invention is to provide a layout method for an arc-shaped side thruster that helps to achieve a smooth transition between the curved surface of the guide vane and the outer plate of the hull.
[0006] To solve the above-mentioned technical problems, the present invention provides a method for laying out an arc-shaped side-push guide plate, comprising the following steps: S1: Obtain a three-dimensional model of the hull plating and the side thrust cylinder, as well as a transverse sectional view and a longitudinal sectional view of the side thrust component. The transverse sectional view and the longitudinal sectional view both contain the outline of the hull plating that smoothly transitions from both sides of the side thrust cylinder through the arc-shaped cross-section of the guide plate. S2: Using the axis of the side thrust cylinder as a reference, a set of radial cutting planes evenly distributed along the circumference are used to cut the three-dimensional model of the hull plate and the side thrust cylinder to obtain multiple radial sections. The multiple radial sections include two sections corresponding to the transverse section view and the longitudinal section view. S3: Measure the angle between the hull plate and the thrust cylinder in each radial section. Using the angle as the independent variable, assign the arc radius of the guide vane's arc-shaped section to each radial section according to a preset positive correlation rule. The positive correlation rule satisfies the following: the assigned arc radius increases with the increase of the angle, and at the sections where the transverse and longitudinal sectional views are located, the assigned arc radius is equal to the known radius corresponding to that section. S4: In each of the radial sections, the outer opening point, inner opening point, and midpoint of the arc are determined according to the allocated arc radius. The outer opening point is the endpoint where the arc section intersects with the hull plate, the inner opening point is the endpoint where the arc section intersects with the thrust cylinder, and the midpoint of the arc is the midpoint of the arc length of the arc section. S5: Map the outer opening point, inner opening point and arc midpoint of each radial section onto the unfolded diagram of the side-push cylinder, and connect them to form a smooth outer opening profile line, inner opening profile line and ridge profile line; S6: Using the outer and inner opening profiles as boundaries and the ridge profile as the bending control line, construct a three-dimensional curved surface model of the guide plate.
[0007] As a preferred embodiment of the present invention, in step S1, in the transverse sectional view and the longitudinal sectional view, there are a total of four arc-shaped cross-sections of the guide plates on both sides of the side-push cylinder, and the arc radius of the four arc-shaped cross-sections is a known radius.
[0008] As a preferred embodiment of the present invention, in step S2, the angle between two adjacent radial planes is 5° to 15°.
[0009] As a preferred embodiment of the present invention, in step S3, the positive correlation rule is as follows: using the radii of the four known arc-shaped sections and the included angles measured at their respective sections as known sample points, a monotonically increasing mapping function between the included angles and the arc radius is established; for the remaining radial sections, the included angles measured therein are substituted into the mapping function to obtain the assigned arc radius.
[0010] As a preferred embodiment of the present invention, the monotonically increasing mapping function is constructed by piecewise linear interpolation, and the interpolation nodes are the four known sample points.
[0011] As a preferred embodiment of the present invention, in step S4, in each radial section, according to the allocated arc radius, arc segments connecting the intersection line of the side thrust cylinder and the intersection line of the hull outer plate are drawn on both sides of the side thrust cylinder respectively; the intersection point of each arc segment and the intersection line of the hull outer plate is taken as the outer opening point, the intersection point of each arc segment and the intersection line of the side thrust cylinder is taken as the inner opening point, and the midpoint of the arc length of each arc segment is taken as the midpoint of the arc.
[0012] As a preferred embodiment of the present invention, in step S5, according to the axial length and circumferential arc length of each of the outer opening point, inner opening point and arc midpoint, each of the outer opening point, inner opening point and arc midpoint is transferred to the corresponding position of the unfolded diagram, and then smoothly connected sequentially using B-spline curve fitting or polynomial curve fitting.
[0013] As a preferred embodiment of the present invention, in step S6, after constructing the three-dimensional curved surface model of the guide plate, a main view is generated based on the three-dimensional curved surface model of the guide plate. The main view is a projection along the axial direction of the side thrust cylinder, used to verify the smoothness of the connection contour between the guide plate and the outer plate of the hull.
[0014] As a preferred embodiment of the present invention, the method further includes step S7: fabricating a machining sample box for the guide plate based on the three-dimensional curved surface model of the guide plate.
[0015] This invention discloses a method for laying out an arc-shaped side thruster. Compared with existing technologies, its advantages are as follows: This invention uses the angle between the hull plate and the side thruster cylinder as the independent variable, and assigns the arc radius of the arc-shaped section of the thruster to each radial section according to a positive correlation rule. It establishes a quantitative correlation between the size of the arc radius and the local geometric features of the hull plate, so that positions with larger angles automatically obtain larger arc radii to achieve a smooth transition, and positions with smaller angles automatically obtain smaller arc radii to maintain a compact connection. This method can adapt to the irregular shape changes of the hull plate along the circumferential direction, which helps to achieve a smooth transition between the curved surface of the thruster and the hull plate, and provides a precise geometric basis for the subsequent approximate unfolding and processing of the thruster. Attached Figure Description
[0016] Figure 1This is a front view of the guide plate of the present invention; Figure 2 This is a longitudinal sectional view of the side-push component of the present invention; Figure 3 This is a cross-sectional view of the side-push component of the present invention; Figure 4 This is one of the radial sectional views of the present invention; Figure 5 This is a structural diagram of the outer opening profile, inner opening profile, and ridge profile of the present invention on the unfolded view of the side-push cylinder; Figure 6 This is a three-dimensional model diagram of the guide plate of the present invention; In the diagram, the hull hull is 100; the side thrust cylinder is 200; the guide vane is 300; the outer opening line is 310; the inner opening line is 320; the ridge line is 330; the outer opening profile line is 400; the inner opening profile line is 500; and the ridge line is 600. Detailed Implementation
[0017] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.
[0018] like Figure 1-6 As shown, a preferred embodiment of the present invention provides a method for laying out an arc-shaped side-push guide plate, comprising the following steps: S1: Obtain a 3D model of the hull plating and the side thruster cylinder, as well as a transverse sectional view and a longitudinal sectional view of the side thruster component. Both the transverse and longitudinal sectional views include the outline of the side thruster cylinder 200 smoothly transitioning from both sides of the cylinder through the arc-shaped cross-sections of the guide vanes 300 to the hull plating 100. Each arc-shaped cross-section is a segment of arc, with one end tangent to the cylinder surface and the other end tangent to the hull plating 100 surface, thus achieving a smooth transition between the guide vanes 300 and the cylinder and hull plating. The design institute provided a transverse sectional view AA and a longitudinal sectional view BB of the side thruster component, as shown below. Figure 2 and 3 As shown. These two sectional views are orthogonal to each other. In the transverse and longitudinal sectional views, there are four arc-shaped sections of the guide vanes 300 on both sides of the thrust cylinder 200. The radii of these four arc-shaped sections are known radii. That is, the arc radius values of the arc-shaped sections of the guide vanes 300 at four locations can be read from these two sectional views. These radius values serve as known parameters for subsequent steps. The three-dimensional models of the hull plating and the thrust cylinder can be directly retrieved from the ship design software. The model does not include the guide vanes, only the hull plating and the thrust cylinder.
[0019] S2: Using the axis of the thrust cylinder as a reference, a set of radially distributed cutting planes along the circumference are used to cut the three-dimensional model of the hull hull and the thrust cylinder, resulting in multiple radial sections. Each radial section contains two sections corresponding to the transverse and longitudinal sectional views. These radial cutting planes all pass through the axis of the thrust cylinder and are arranged radially outward from the axis. After cutting the three-dimensional model with these planes, each section simultaneously presents the intersection line of the cylinder and the intersection line of the hull hull.
[0020] Generally, the angle between two adjacent radial planes is between 5° and 15°. A smaller angle increases the number of sections and improves layout accuracy; a larger angle reduces the number of sections and improves computational efficiency. In this embodiment, the included angle between adjacent cutting planes is 11.25°, evenly arranged along the 360° circumference, resulting in 16 radial sections, balancing accuracy and efficiency. Among these 16 radial sections, two coincide with the transverse and longitudinal sectional views provided by the design institute, respectively, and the radius of the guide vane arc at these two radial sections is known. For the remaining 14 radial sections, the radius of the arc-shaped section of the guide vane is to be determined.
[0021] S3: Measure the angle between the hull plating and the thrust cylinder in each radial section. Using the measured angle between the hull plating and the thrust cylinder as the independent variable, assign the arc radius of the guide vane's arc-shaped section to each radial section according to a preset positive correlation rule. The positive correlation rule satisfies the following: the assigned arc radius increases with the increase of the angle, and at the sections containing the transverse and longitudinal sectional views, the assigned arc radius is equal to the known radius corresponding to that section. In each radial section, there is an angle between the hull plating and the thrust cylinder on each side of the thrust cylinder. This angle is measured as the angle between the tangent of the hull plating intersection line at the connection point and the intersection line of the thrust cylinder, reflecting the degree of opening of the hull plating relative to the thrust cylinder at that position. The positive correlation rule is the core of this method. Its design basis is: the larger the opening angle between the hull plating and the thrust cylinder, the smoother the transition of the guide vane should be, and therefore the larger the required arc radius. Conversely, the smaller the opening angle, the more compact the transition can be, and the smaller the required arc radius. This allocation rule establishes a quantitative relationship between the arc radius of the guide vane's arc-shaped cross-section and the local geometric features of the hull plating, replacing the traditional method that relies on experience and manual trial and error.
[0022] For example, the positive correlation rule is as follows: using the radii of the four known arc-shaped sections and the included angles measured at their respective sections as known sample points, a monotonically increasing mapping function between the included angles and the arc radii is established; for the remaining radial sections, their measured included angles are substituted into the mapping function to obtain the assigned arc radii. This mapping function takes the included angle as input and the arc radius as output, with each included angle value on the function curve corresponding to a unique arc radius. The four known sample points determine four fixed positions on the function curve, and the remaining sections find their corresponding radius values on the curve based on their own included angle values.
[0023] For example, the monotonically increasing mapping function is constructed through piecewise linear interpolation, with the interpolation nodes being the four known sample points. It should be noted that the four known sample points come from the horizontal and vertical sectional views and do not necessarily include extreme points of the included angle. When the measured included angle of a radial section is less than the included angle of the smallest known sample point, or greater than the included angle of the largest known sample point, the corresponding arc radius is obtained by extrapolation according to the linear relationship of the first or last segment of the piecewise linear interpolation function. Thus, this method can adaptively ensure that the radius is smallest where the included angle is smallest and largest where the included angle is largest. The four known sample points are arranged in ascending order of included angle, and adjacent sample points are connected by straight lines to form a broken line composed of three straight line segments. Each node of the broken line corresponds to a known sample point. The portion of the broken line outside the range of included angles of the known sample points continues to extend along the slope direction of the first or last segment.
[0024] The following is a detailed explanation using data from this embodiment.
[0025] This embodiment yields 16 radial sections along the circumference, each containing both sides of the lateral thrust cylinder, totaling 32 locations where arc radii need to be allocated. For ease of distinction and description, these 32 locations are numbered 1-32 in circumferential order. Figure 1 As shown. Four known sample points are from the longitudinal and transverse sectional views, respectively: point 1 (corresponding to side AA of the longitudinal sectional view), with a known radius. At position 17 (corresponding to the other side of longitudinal section view AA), the radius is known. ; Serial number 9 (corresponding to side BB in the horizontal sectional view). At position 25 (corresponding to the other side of the transverse sectional view BB), the radius is known. .
[0026] The four known sample points are arranged in ascending order of the measured included angles. In this embodiment, the included angles measured from each radial profile are ordered as follows: the included angle at point 15 is the smallest, followed by point 17, then point 9, with point 25 being the largest, point 1 being the largest, and point 31 being the largest. Therefore, the arrangement order of the four known sample points on the included angle axis is: point 17 (including the included angle...) ,radius ), number 9 (angle) ,radius ), number 25 (angle) ,radius ), number 1 (angle) ,radius ).
[0027] In the "angle-radius" coordinate system, connecting these four points sequentially with straight line segments forms a broken line composed of three straight line segments. The linear interpolation formulas for each segment are as follows: First paragraph ( ): ; Second paragraph ( ): ; Third paragraph ( ): ; When the included angle exceeds the range of known sample points, the extension formula is as follows: Extend linearly outwards from both ends of the broken line: when Time (e.g., at number 15): ; when Time (e.g., at number 31): ; Through the above piecewise linear interpolation and extension processing, the radii of the arcs at all 32 locations across 16 cross-sections were determined. The included angle at location 15 is the smallest; substituting this into the first extension formula, the result is less than... The radius value is the global minimum radius. The included angle is largest at position 31. Substituting this into the third segment's extension formula, we obtain a value greater than... The radius value is the global maximum radius. The size of the radius at each position is determined by its corresponding included angle. The trend of the radius changing along the circumference is consistent with the trend of the included angle changing along the circumference. It is not constrained by the section number sequence and can adapt to irregular changes in the shape of the hull plate.
[0028] S4: In each of the radial sections, the outer opening point, inner opening point, and midpoint of the arc-shaped section are determined according to the allocated arc radius. The outer opening point is the endpoint where the arc-shaped section intersects with the hull plate, the inner opening point is the endpoint where the arc-shaped section intersects with the thrust cylinder, and the midpoint of the arc is the midpoint of the arc length of the arc-shaped section.
[0029] In this embodiment, specifically, in each radial section, according to the allocated arc radius, arc segments connecting the intersection line of the side thrust cylinder and the intersection line of the hull outer plate are drawn on both sides of the side thrust cylinder. The intersection point of each arc segment and the intersection line of the hull outer plate is taken as the outer opening point, and the intersection point of each arc segment and the intersection line of the side thrust cylinder is taken as the inner opening point. The midpoint of the arc length of each arc segment is taken as the midpoint of the arc. It should be noted that for the two known sections corresponding to the transverse and longitudinal sectional views, the geometric parameters of the arc-shaped cross-section of the guide vane have been given by the design institute. The outer opening point, inner opening point, and midpoint of the arc can be directly obtained from the known arc-shaped cross-section, without needing to perform the arc segment drawing operation described in this step. This step mainly targets the remaining radial sections for which the arc radius is obtained through interpolation allocation. One arc segment needs to be drawn on each side of the side thrust cylinder in each radial section. One end of the arc segment is tangent to the intersection line of the thrust cylinder, and the other end is tangent to the intersection line of the hull hull. This ensures a smooth connection between the guide vane's curved surface and the thrust cylinder and hull hull hull. The outer point records the intersection position of the arc-shaped section of the guide vane with the hull hull hull hull, the inner point records the intersection position of the arc-shaped section of the guide vane with the thrust cylinder, and the midpoint of the arc records the middle position of the arc segment of the guide vane's arc-shaped section. These three points together describe the geometry and spatial orientation of the arc-shaped section at this cross-section.
[0030] S5: Map the outer opening point, inner opening point, and arc midpoint of each radial section onto the unfolded diagram of the side-push cylinder, connecting them to form a smooth outer opening line 400, inner opening line 500, and ridge line 600. Specifically, based on the axial length and circumferential arc length of each outer opening point, inner opening point, and arc midpoint, transfer each outer opening point, inner opening point, and arc midpoint to its corresponding position on the unfolded diagram, and smoothly connect them sequentially using B-spline curve fitting or polynomial curve fitting. The unfolded diagram of the side-push cylinder is a planar diagram obtained by cutting the cylindrical surface of the side-push cylinder along a generatrix and then laying it flat. The horizontal axis of the unfolded diagram corresponds to the axial direction of the side-push cylinder, and the vertical axis corresponds to the circumferential direction of the side-push cylinder. Each spatial point is determined to have a lateral position on the unfolded diagram according to its axial length, and a longitudinal position on the unfolded diagram according to its circumferential arc length. Connecting points of the same type (all external opening points, all internal opening points, and all arc midpoints) sequentially on the unfolded diagram forms three planar curves. These three curves visually demonstrate the width variation and curvature of the guide vane along the circumference of the cylinder on the unfolded diagram.
[0031] S6: Using the outer and inner opening profiles as boundaries and the ridge line as the curvature control line, construct a three-dimensional surface model of the guide vane. The outer opening profile defines the connection contour between the guide vane and the hull plating, the inner opening profile defines the connection contour between the guide vane and the thrust cylinder, and the ridge line controls the concave-convex direction and curvature degree of the guide vane surface between the two boundaries. Using these three profiles as input, generate the three-dimensional surface of the guide vane in 3D modeling software through surface lofting or sweeping functions. The outer boundary of this surface fits the surface of the hull plating, the inner boundary fits the surface of the thrust cylinder, and the middle of the surface smoothly transitions according to the trend of the ridge line.
[0032] For example, in step S6, after constructing the three-dimensional surface model of the guide vane, a main view is generated based on the three-dimensional surface model of the guide vane. The main view is a projection along the axial direction of the side thrust cylinder, used to verify the smoothness of the connection contour between the guide vane and the hull plate. The constructed three-dimensional surface model of the guide vane is projected along the axial direction of the side thrust cylinder to obtain the main view. Designers can visually check the smoothness of the outer opening line 310, inner opening line 320, and ridge line 330 in the main view to verify whether the transition between the guide vane surface and the hull plate is smooth. If local bulges or depressions are found in the curve, the radius distribution of the arc at the corresponding section can be adjusted until the curve in the main view meets the smoothness requirements.
[0033] For example, this method further includes step S7: fabricating a sample box for the guide plate based on the three-dimensional curved surface model of the guide plate. First, using the ridge line obtained in step S5 as the boundary, the curved surface of the guide plate is divided into a first region near the side thrust cylinder and a second region near the hull plate, and these regions are unfolded separately. During unfolding, the area to be unfolded is divided into several small triangular meshes on the three-dimensional curved surface model, the spatial real length of the three sides of each triangle is measured, and then each triangle is reconstructed sequentially on the plane using the triangle method, and the approximate unfolded diagram of the region is obtained by splicing them together. Since the curved surface of the guide plate has a large degree of hypercurvature, after the first region and the second region are unfolded separately, there may be a deviation in the docking boundary of the two unfolded plates at the ridge line. At this time, the ridge line boundaries of the two unfolded plates can be aligned, and the maximum outer contour of the two plates is taken as the splicing boundary along the docking point. The two unfolded plates are spliced into a whole plate according to the principle of encompassing the actual curved surface boundary, so that the spliced whole plate can completely cover the unfolded area of the curved surface of the guide plate. The assembled plate is the complete flat blanking part of the guide plate. It can be used for subsequent steel plate cutting, and the design boundary can be achieved by trimming during the forming process.
[0034] This method uses the angle between the hull plating and the thrust cylinder as the independent variable, and assigns the arc radius of the guide vane's arc-shaped section to each cross-section according to a preset positive correlation rule. It establishes a quantitative mapping relationship between the arc radius and the local geometric features of the hull plating, overcoming the limitations of traditional methods that rely on manual trial and error. The rule that the radius increases with the angle ensures that locations with larger angles automatically receive larger arc radii for a smooth transition, while locations with smaller angles automatically receive smaller arc radii to maintain a compact connection. This method can adapt to irregularities in the hull plating along the circumferential direction. The shape variation helps to achieve a smooth transition between the guide vane surface and the hull plating; using four known radii and corresponding included angles provided by the design institute as sample points, a mapping function is constructed through piecewise linear interpolation, which is simple to calculate and easy to implement in general ship design software; by generating three control lines—outer opening line, inner opening line, and ridge line—through the outer opening point, inner opening point, and arc midpoint, the boundary and bending shape of the guide vane surface are fully defined, providing accurate geometric basis for the subsequent approximate unfolding of the guide vane, sample box fabrication, and steel plate cutting, which helps to improve unfolding accuracy and processing quality.
[0035] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.
Claims
1. A method for laying out an arc-shaped side-push guide plate, characterized in that: Includes the following steps: S1: Obtain a three-dimensional model of the hull plating and the side thrust cylinder, as well as a transverse sectional view and a longitudinal sectional view of the side thrust component. The transverse sectional view and the longitudinal sectional view both contain the outline of the hull plating that smoothly transitions from both sides of the side thrust cylinder through the arc-shaped cross-section of the guide plate. S2: Using the axis of the side thrust cylinder as a reference, a set of radial cutting planes evenly distributed along the circumference are used to cut the three-dimensional model of the hull plate and the side thrust cylinder to obtain multiple radial sections. The multiple radial sections include two sections corresponding to the transverse section view and the longitudinal section view. S3: Measure the angle between the hull plate and the thrust cylinder in each radial section. Using the angle as the independent variable, assign the arc radius of the guide vane's arc-shaped section to each radial section according to a preset positive correlation rule. The positive correlation rule satisfies the following: the assigned arc radius increases with the increase of the angle, and at the sections where the transverse and longitudinal sectional views are located, the assigned arc radius is equal to the known radius corresponding to that section. S4: In each of the radial sections, the outer opening point, inner opening point, and midpoint of the arc are determined according to the allocated arc radius. The outer opening point is the endpoint where the arc section intersects with the hull plate, the inner opening point is the endpoint where the arc section intersects with the thrust cylinder, and the midpoint of the arc is the midpoint of the arc length of the arc section. S5: Map the outer opening point, inner opening point and arc midpoint of each radial section onto the unfolded diagram of the side-push cylinder, and connect them to form a smooth outer opening profile line, inner opening profile line and ridge profile line; S6: Using the outer and inner opening profiles as boundaries and the ridge profile as the bending control line, construct a three-dimensional curved surface model of the guide plate.
2. The layout method for the arc-shaped side-push guide plate according to claim 1, characterized in that: In step S1, in the transverse and longitudinal sectional views, there are four arc-shaped sections of the guide plates on both sides of the side thrust cylinder, and the arc radii of these four arc-shaped sections are known radii.
3. The layout method for the arc-shaped side-push guide plate according to claim 1, characterized in that: In step S2, the angle between two adjacent radial planes is 5° to 15°.
4. The layout method for the arc-shaped side-push guide plate according to claim 2, characterized in that: In step S3, the positive correlation rule is as follows: using the radii of the four known arc-shaped sections and the included angles measured at their respective sections as known sample points, a monotonically increasing mapping function between the included angles and the arc radius is established; for the remaining radial sections, the included angles measured therein are substituted into the mapping function to obtain the assigned arc radius.
5. The layout method for the arc-shaped side-push guide plate according to claim 4, characterized in that: The monotonically increasing mapping function is constructed by piecewise linear interpolation, with the interpolation nodes being the four known sample points.
6. The layout method for the arc-shaped side-push guide plate according to claim 1, characterized in that: In step S4, in each radial section, according to the allocated arc radius, arc segments connecting the intersection line of the side thrust cylinder and the intersection line of the hull plate are drawn on both sides of the side thrust cylinder; the intersection point of each arc segment and the intersection line of the hull plate is taken as the outer opening point, the intersection point of each arc segment and the intersection line of the side thrust cylinder is taken as the inner opening point, and the midpoint of the arc length of each arc segment is taken as the midpoint of the arc.
7. The layout method for the arc-shaped side-push guide plate according to claim 1, characterized in that: In step S5, based on the axial length and circumferential arc length of each of the outer opening point, inner opening point, and arc midpoint, each of the outer opening point, inner opening point, and arc midpoint is transferred to the corresponding position of the unfolded diagram, and then smoothly connected sequentially using B-spline curve fitting or polynomial curve fitting.
8. The layout method for the arc-shaped side-push guide plate according to claim 1, characterized in that: In step S6, after constructing the three-dimensional curved surface model of the guide plate, a main view is generated based on the three-dimensional curved surface model of the guide plate. The main view is a projection along the axial direction of the side thrust cylinder and is used to verify the smoothness of the connection contour between the guide plate and the outer plate of the hull.
9. The layout method for the arc-shaped side-push guide plate according to claim 1, characterized in that: It also includes step S7: making a machining sample box for the guide plate based on the three-dimensional curved surface model of the guide plate.