Method of lofting bilge keel web in single plate form and ship
By using a single-layer bilge keel web layout method, and employing two projections and impact correction, the problem of the inability to inspect the bilge keel web layout was solved, enabling quality traceability and inspection of the bilge keel manufacturing process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CSSC HUANGPU WENCHONG SHIPBUILDING CO LTD
- Filing Date
- 2023-09-21
- Publication Date
- 2026-06-09
Smart Images
Figure CN117208156B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of shipbuilding technology, and in particular to a method for laying out a single-layer bilge keel web and a ship. Background Technology
[0002] Currently, bilge keels are a simple and effective device for reducing ship roll during navigation, and are used in almost all seagoing vessels. In shipbuilding, bilge keels are installed along the length of the ship at the bilge. To achieve greater roll damping, the bilge keel should be installed on the diagonal line from the intersection of the half-breadth line and the baseline to the ship's center of gravity, but not beyond the half-breadth line and baseline, to avoid damage during dry-docking.
[0003] In terms of structural form: Generally, a single-layer plate structure can be used when the width of the bilge keel web is less than 600mm, and a double-layer plate structure can be used when it exceeds 600mm. The layout methods for these two bilge keel web structures are similar, with the double-layer plate structure only requiring one more layout of the web than the single-layer plate structure. Regarding the positioning of the bilge keel web cross-section, there are currently two main forms: one is that the bilge keel web is arranged perpendicular to the bilge keel traces on the outer plate (hull); the other is that the bilge keel web is arranged at a fixed angle along the bilge keel traces on the outer plate. The two types of bilge keel web curvatures described above differ. In the former type, the inner opening line of the bilge keel web (the outer plate thickness offset outward from the outer plate trace and the bilge keel pad thickness) is not on the same plane as the outer opening line, resulting in a curved bilge keel web. In the latter type, the inner opening line of the bilge keel web (the outer plate thickness offset outward from the outer plate trace and the bilge keel pad thickness) is on the same plane as the outer opening line, resulting in a planar double-oblique-cut bilge keel web.
[0004] Currently, in ship production design, the bilge keel web layout mostly involves first setting and smoothing the bilge keel profile, then using ship design software to build a bilge keel model based on the bilge keel profile, and finally using relevant layout software to unfold the web in the model. This method has the following drawbacks: the unfolded bilge keel web obtained from the layout software lacks the actual layout process, making it impossible to verify the layout results.
[0005] Therefore, a single-layer bilge keel web layout method and vessel are needed to solve the above problems. Summary of the Invention
[0006] The purpose of this invention is to provide a method and vessel for laying out a single-layer bilge keel web, which preserves the entire laying out process of the bilge keel web and facilitates the inspection of the bilge keel laying out results.
[0007] To achieve this objective, the present invention adopts the following technical solution:
[0008] The method for laying out the web of a single-layer bilge keel includes the following steps:
[0009] S1. The positioning line of the bilge keel is projected along the half-width direction at the first intersection point on the rib line according to the theoretical rib distance to obtain the first projection point on each theoretical rib. The first projection points are connected sequentially from the bow to the stern to form the first inner opening projection line.
[0010] S2. The first intersection point is offset by a set distance along the extension direction of the positioning line to obtain a second intersection point. The second intersection point is projected along the half-width direction according to the theoretical rib spacing to obtain a second projection point on each theoretical rib position. The second projection points are connected sequentially from the bow to the stern to form a first outer opening projection line.
[0011] S3. Measure the distance between two adjacent first projection points as the elongation rib distance;
[0012] S4. Draw the normal line for each first projection point. Each normal line intersects the first outer projection line to form a third intersection point. The third intersection point corresponds one-to-one with the second projection point.
[0013] S5. Measure the distance between the corresponding third intersection point and the second projection point as the impulse of the second projection point;
[0014] S6. Project the first intersection point along the height direction according to the elongated rib spacing to obtain a third projection point on each elongated rib position, and connect the third projection points in sequence to form a second inner opening projection line.
[0015] S7. The second intersection point is projected along the height direction according to the elongated rib spacing to obtain a fourth projection point on each elongated rib position, and the fourth projection points are connected in sequence to form a second outer projection line.
[0016] S8. Draw a perpendicular line from the fourth projection point to the projection line of the second inner opening.
[0017] S9. Taking each of the third projection points as the center, and with the set distance as the radius, intersect the perpendicular line at the fourth intersection point to obtain a positioning arc.
[0018] S10. Taking the fourth intersection point as the center, and its corresponding momentum as the radius, intersects the arc line at the fifth intersection point. Connecting the third projection point with the corresponding fifth intersection point is the rib line after the bilge keel web is unfolded. Connecting each of the fifth intersection points is the outer opening line after the bilge keel web is unfolded.
[0019] Furthermore, the set distance is the width of the bilge keel web.
[0020] Furthermore, the anterior toe end of the bilge keel sternite is beveled to form a beveled portion.
[0021] Furthermore, the anterior toe end of the bilge keel sternite is rounded.
[0022] Furthermore, the beveled portion forms a transition end with the main body of the bilge keel web. The transition end is obtained by using steps S1-S10 to obtain the rib line and the point on the outer opening line after the transition end is unfolded.
[0023] Furthermore, the profile positioning is performed once for each rib position.
[0024] Furthermore, the angle of the beveled portion is set according to the dimensions of the bilge keel web.
[0025] The vessel includes a hull and a bilge keel web, the bilge keel web being fixedly mounted on the outer plating of the hull, and the bilge keel being designed using the single-layer plate bilge keel web layout method described above.
[0026] The beneficial effects of this invention are:
[0027] This invention provides a method for laying out the web of a single-layer bilge keel. This method employs two projections: the first projection obtains the impulse of the second projection point and the elongated rib spacing between adjacent first projection points; then, a second projection is performed along the height direction using the elongated rib spacing, and the impulse is used to correct the data. This yields the rib lines and outer opening lines of the unfolded bilge keel web. By using the impulse to calculate the distance from the projection normal point on the outer opening line obtained in the second projection after elongating the rib spacing to the point to be unfolded, the entire bilge keel web laying process is preserved. This facilitates quality traceability and improvement in the bilge keel manufacturing process and allows for easy verification of the bilge keel laying results.
[0028] The present invention provides a ship, including a hull and a bilge keel web. The bilge keel web is fixedly mounted on the outer plate of the hull. The bilge keel is designed using the above-described single-layer plate bilge keel web layout method, which retains the entire bilge keel web layout process and facilitates the inspection of the bilge keel layout results. Attached Figure Description
[0029] Figure 1 This is a schematic diagram of the anterior toe end of the bilge keel web in a single-layer plate type bilge keel web layout method of the present invention;
[0030] Figure 2 This is a schematic diagram of the first projection in the layout method of a single-layer plate type bilge keel web of the present invention;
[0031] Figure 3 This is a schematic diagram of the first projection to obtain the impulse in the layout method of a single-layer plate type bilge keel web of the present invention;
[0032] Figure 4 This is a schematic diagram of the second projection in the layout method of a single-layer plate type bilge keel web of the present invention;
[0033] Figure 5 This is a schematic diagram of obtaining the fifth intersection point through the second projection in a single-layer plate type bilge keel web layout method of the present invention;
[0034] Figure 6 This is an unfolded diagram of the bilge keel web in a single-layer plate type bilge keel web layout method of the present invention.
[0035] In the picture:
[0036] 1. Forefoot tip; 11. Beveled portion; 12. Rounded corner; 13. Main body; 2. First inner opening projection line; 3. First outer opening projection line; 4. Second inner opening projection line; 5. Second outer opening projection line. Detailed Implementation
[0037] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings, not all of them.
[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.
[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0040] In the design of the bilge keel web, in order to preserve the entire layout process of the bilge keel web and facilitate the verification of the bilge keel layout results, such as... Figures 1-6As shown, this invention provides a method for laying out the web of a single-layer bilge keel. The method for laying out the web of a single-layer bilge keel includes the following steps:
[0041] S1. The positioning line of the bilge keel is projected along the half-width direction at the first intersection point on the rib line according to the theoretical rib distance to obtain the first projection point on each theoretical rib. The first projection points are connected sequentially from the bow to the stern to form the first inner opening projection line 2.
[0042] S2. The first intersection point is offset by a set distance along the extension direction of the positioning line to obtain the second intersection point. The second intersection point is projected along the half-width direction according to the theoretical rib spacing to obtain the second projection point on each theoretical rib position. The second projection points are connected sequentially from the bow to the stern to form the first outer opening projection line 3.
[0043] S3. Measure the distance between two adjacent first projection points as the elongation rib distance;
[0044] S4. Draw the normal line of each first projection point. Each normal line intersects with the first outer projection line 3 to form a third intersection point. The third intersection point corresponds to the second projection point one by one.
[0045] S5. Measure the distance between the corresponding third intersection point and the second projection point as the impulse of the second projection point;
[0046] S6. Project the first intersection point along the height direction according to the elongated rib spacing to obtain the third projection point at each elongated rib position, and connect the third projection points in sequence to form the second inner opening projection line 4.
[0047] S7. The second intersection point is projected along the height direction according to the elongated rib spacing to obtain the fourth projection point at each elongated rib position. The fourth projection points are connected in sequence to form the second outer projection line 5.
[0048] S8. Draw a perpendicular line from the fourth projection point to the second inner projection line 4.
[0049] S9. Using each third projection point as the center and a set distance as the radius, intersect the perpendicular line at the fourth intersection point to obtain the positioning arc.
[0050] S10. With the fourth intersection point as the center, and its corresponding impulse as the radius, intersect the arc at the fifth intersection point. Connecting the third projection point with the corresponding fifth intersection point gives the rib line after the bilge keel web is unfolded. Connecting each fifth intersection point gives the outer opening line after the bilge keel web is unfolded.
[0051] By employing a two-projection method, the first projection obtains the impulse of the second projection point and the elongated rib spacing between adjacent first projection points. Then, a second projection is performed along the height direction using the elongated rib spacing, and the impulse is used to correct the data. This yields the rib lines and outer opening lines of the unfolded bilge keel web. The impulse is used to calculate the distance from the projection normal point on the outer opening line obtained in the second projection after elongating the rib spacing to the point to be unfolded. This preserves the entire bilge keel web layout process, facilitating quality traceability and improvement in bilge keel manufacturing and enabling easy verification of the bilge keel layout results.
[0052] Furthermore, the distance is set to the width of the bilge keel web. By offsetting the width of the bilge keel web, the position of the second intersection point can be determined. Then, the second projection point can be obtained through projection. Connecting the second projection points sequentially from the bow to the stern forms the first outer opening projection line 3, thereby obtaining the theoretical first outer opening projection line 3. In other embodiments, the offset distance can also be determined according to design requirements, and no further restrictions are imposed here.
[0053] Furthermore, the anterior toe end 1 of the bilge keel web is beveled to form a beveled portion 11. By beveling the anterior toe end 1 of the bilge keel web, stress concentration in the bilge keel web can be eliminated, thereby ensuring the structural strength of the bilge keel web.
[0054] Furthermore, the end of the fore-toe 1 of the bilge keel web is rounded 12. By designing the rounded corner 12, the stress concentration at the end of the fore-toe 1 of the bilge keel web can be further eliminated, ensuring the strength of the connection between the bilge keel web and the hull after installation on the hull.
[0055] Furthermore, the beveled portion 11 forms a transition end with the main body portion 13 of the bilge keel web. The transition end is obtained by using steps S1-S10 to obtain the rib line and the point on the outer opening line after the transition end is unfolded. In this way, it is convenient to determine the rib line of the transition end.
[0056] Furthermore, the angle of the beveled portion 11 is set according to the dimensions of the bilge keel web. Specifically, designers can design according to actual needs, flexibly meeting the stress concentration requirements of bilge keel webs of different sizes.
[0057] Furthermore, the profile positioning is performed once for each rib section. This method achieves more precise results.
[0058] like Figures 1-6 As shown, the example given is the unfolding of the web of the bilge keel with ribs between #90 and #110. For clarity and convenience, the profile is positioned every 5 rib positions, and the width of the web is 450mm.
[0059] The positioning lines of the bilge keel are projected along the half-width direction at the first intersection point on the rib line according to the theoretical rib distance. The first projection points of ribs #110 to #90 are a, b, c, d, and e, respectively. Connecting these points forms the first inner opening projection line 2. The first intersection point is offset by 450mm along the extension direction of the positioning line to obtain the second intersection point. The second intersection point is projected along the half-width direction according to the theoretical rib distance to obtain the second projection points a', b', c', d', and e' on each theoretical rib. Connecting these points forms the first outer opening projection line 3.
[0060] Measure the lengths of ab, bc, cd, and de as the elongation rib distance.
[0061] Draw the normal (perpendicular) lines of the first inner opening projection line 2 through points a, b, c, d, and e respectively. The distances between the third intersection point of the normal line and the first outer opening projection line 3 and points a', b', c', d', and e' on the outer opening projection line are the impulses of the outer opening lines of each rib, namely y1, y2, y3, y4, and y5 respectively.
[0062] Project the first intersection point along the height direction according to the elongated rib spacing to obtain the third projection points a1, b1, c1, d1, e1 at each elongated rib position. Connect the third projection points in sequence to form the second inner opening projection line 4.
[0063] The second intersection point is projected along the height direction according to the elongated rib spacing to obtain the fourth projection point a1', b1', c1', d1', e1' at each elongated rib position. The second projection point is connected sequentially from the bow to the stern to form the first outer opening projection line 3, and the fourth projection point is connected sequentially to form the second outer opening projection line 5.
[0064] Expand the fourth projection point a1' on the rib position with the third projection point a1 as the base point. Draw a perpendicular line from point a1' to the second inner opening projection line 4 at point a1”. With point a1 as the center and the bilge keel web width of 450mm as the radius, intersect the extension line of a1”a1' at point a1”'. Based on the corresponding impulse value y1, with point a1”' as the center and y1 as the radius, intersect the arc with point a1 as the center and the bilge keel web width of 450mm as the radius at point a1””. Connect point a1 and point a1”” to form the line segment a1a1””, which is the #110 rib line after the bilge keel web is expanded. Similarly, expand the other points and connect them smoothly to obtain the outer opening line and rib line after the bilge keel web is expanded.
[0065] This embodiment also provides a ship, including a hull and a bilge keel web. The bilge keel web is fixedly mounted on the outer plate of the hull. The bilge keel is designed using the above-described single-layer plate bilge keel web layout method, which retains the entire bilge keel web layout process and facilitates the inspection of the bilge keel layout results.
[0066] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.
Claims
1. A method for laying out the web of a single-layer bilge keel, characterized in that, Includes the following steps: S1. The positioning line of the bilge keel is projected along the half-width direction at the first intersection point on the rib line according to the theoretical rib distance to obtain the first projection point on each theoretical rib. The first projection point is connected sequentially from the bow to the stern to form the first inner opening projection line (2). S2. The first intersection point is offset by a set distance along the extension direction of the positioning line to obtain a second intersection point. The second intersection point is projected along the half-width direction according to the theoretical rib distance to obtain a second projection point on each theoretical rib position. The second projection points are connected sequentially from the bow to the stern to form a first outer opening projection line (3). S3. Measure the distance between two adjacent first projection points as the elongation rib distance; S4. Draw the normal line of each first projection point. Each normal line intersects the first outer projection line (3) to form a third intersection point. The third intersection point corresponds to the second projection point one by one. S5. Measure the distance between the corresponding third intersection point and the second projection point as the impulse of the second projection point; S6. Project the first intersection point along the height direction according to the elongated rib spacing to obtain the third projection point at each elongated rib position, and connect the third projection points in sequence to form the second inner opening projection line (4). S7. The second intersection point is projected along the height direction according to the elongated rib spacing to obtain the fourth projection point on each elongated rib position, and the fourth projection points are connected in sequence to form the second outer projection line (5). S8. Draw a perpendicular line from the fourth projection point to the second inner opening projection line (4); S9. Taking each of the third projection points as the center, and with the set distance as the radius, intersect the perpendicular line at the fourth intersection point to obtain a positioning arc. S10. Taking the fourth intersection point as the center, and its corresponding momentum as the radius, intersects the arc line at the fifth intersection point. Connecting the third projection point with the corresponding fifth intersection point is the rib line after the bilge keel web is unfolded. Connecting each of the fifth intersection points is the outer opening line after the bilge keel web is unfolded.
2. The method for laying out the web of a single-layer bilge keel according to claim 1, characterized in that, The set distance is the width of the bilge keel web.
3. The method for laying out the web of a single-layer bilge keel according to claim 1, characterized in that, The anterior toe end (1) of the bilge keel stern plate is beveled to form a beveled portion (11).
4. The method for laying out the web of a single-layer bilge keel according to claim 3, characterized in that, The end of the forefoot end (1) of the bilge keel stern is rounded (12).
5. The method for laying out the web of a single-layer bilge keel according to claim 3, characterized in that, The beveled portion (11) forms a transition end with the main body portion (13) of the bilge keel web. The transition end is obtained by using steps S1-S10 to obtain the rib line and the point on the outer opening line after the transition end is unfolded.
6. The method for laying out the web of a single-layer bilge keel according to claim 1, characterized in that, Perform profile positioning for each rib section.
7. The method for laying out the web of a single-layer bilge keel according to claim 3, characterized in that, The angle of the beveled portion (11) is set according to the size of the bilge keel web.
8. A ship, characterized in that, The vessel includes a hull and a bilge keel web, wherein the bilge keel web is fixedly mounted on the outer plate of the hull, and the bilge keel is designed using the single-layer plate bilge keel web layout method as described in any one of claims 1-7.