Ship body structure trepanning design method based on rules

Abstract

The invention provides a ship body structure trepanning design method based on rules, and relates to the field of ship design and manufacturing. The method comprises the following steps: firstly, constructing a design rule base containing opening types and selection rules according to a hull structure opening standard; then three-dimensional information of a target part is obtained in the three-dimensional model, and corresponding trepanning types and parameters are matched for the part based on the design rule base and the three-dimensional information; and finally, holes conforming to specifications are generated in batches. According to the method, a set of efficient and reliable design process is formed by converting the standard specification into the structured design rule and deeply fusing the structured design rule with the three-dimensional design environment, manual judgment and manual operation are remarkably reduced, the design efficiency, standardization and accuracy are effectively improved, and the design difficulty and the error rate are reduced.

Description

Technical Field

[0001] This invention relates to the field of ship design and manufacturing, and specifically to a rule-based method for designing openings in ship hull structures. Background Technology

[0002] In the shipbuilding industry, digital design technology based on 3D models has been widely used. In hull structure design, in order to ensure weld continuity and meet functional requirements such as water flow and ventilation, corner holes and drainage holes are usually required in the plates and longitudinal girders.

[0003] However, the highly diverse specifications and intersection forms of hull parts make the design process for opening profiles cumbersome. Currently, designers must manually analyze the actual intersection scenarios of structures in the 3D model and frequently consult cumbersome standard node drawings for hull structure openings to manually determine and select appropriate opening types and parameters before manually modeling. This design mode, which heavily relies on the designer's personal experience and manual operation, not only has a long design cycle and high costs but also makes it difficult to guarantee the consistency and accuracy of the design, becoming a bottleneck restricting the improvement of efficiency in digital ship design. Summary of the Invention

[0004] In view of the above-mentioned defects in the prior art, the present invention provides a rule-based method for designing openings in ship hull structures to solve the problems of high difficulty, low efficiency and error susceptibility in designing corner holes and drainage holes in the prior art.

[0005] This application provides a rule-based method for designing openings in ship hull structures, comprising the following steps:

[0006] S1. Based on the hull structure opening standards, define multiple opening types and form opening selection rules based on the three-dimensional information of the parts;

[0007] S2. Select the target part in the 3D model, obtain the 3D information of the target part, and match the corresponding opening type and parameters for the target part based on the opening selection rules and the 3D information of the target part.

[0008] S3. Generate openings on the target part in the three-dimensional model according to the matched opening type and parameters.

[0009] In one implementation method, in step S1, the standard for the opening of the hull structure is recorded in the standard node drawing of the hull structure opening.

[0010] As one implementation method, step S1 specifically includes:

[0011] Each type of opening is coded, including corner holes and drainage holes;

[0012] Based on the aforementioned hull structure opening standards, the application scenario conditions for each opening type are defined to form the opening selection rules.

[0013] As one implementation, the corner hole types include fan-shaped holes, KS holes, and VU holes;

[0014] The types of drainage holes include round holes, HE holes, and HO holes.

[0015] In one implementation, the three-dimensional information of the target part obtained in step S2 includes at least one of the following:

[0016] The connection form of the plate corner boundary, the over-welding information at the corner, the part type, the part location information, the location information of the restricted area, the part size parameters, the position of the longitudinal bone on its attached plate frame, the location of the strong member through which the longitudinal bone passes, and the location of the fillet weld between the longitudinal bone and the plate frame.

[0017] As one implementation method, in step S2, matching the target part with the corresponding opening type and parameters based on the opening selection rules and the three-dimensional information of the target part includes:

[0018] Based on the connection form of the two boundaries at the corner of the board, determine whether the corner needs to be opened with a corner hole;

[0019] Based on the solder over-soldering information at the corner point, determine whether the corner hole type at the corner point is limited to VU hole;

[0020] Based on the part type, determine whether the part is suitable for corner holes or drainage holes, and whether there are any opening restrictions.

[0021] As one implementation method, in step S2, matching the target part with the corresponding opening type and parameters based on the opening selection rules and the three-dimensional information of the target part includes:

[0022] Based on the part location information, determine whether the part is located at the liquid tank boundary or inside the liquid tank, and adjust the opening type or decide whether to open a water flow hole accordingly.

[0023] Based on the location information of the restricted area, specific types of openings are excluded from being installed within the restricted area;

[0024] Based on the part size parameters, determine whether the distance from the corner point to the plate boundary meets the opening conditions for a specific type of corner hole.

[0025] In one embodiment, the method further includes a step of determining the location of the water outlet, which includes:

[0026] Based on the position of the longitudinal bone on its attachment plate, determine whether it is necessary to open a drainage hole;

[0027] Based on the location of the strong component through which the longitudinal bone passes, the reference area for opening the drainage hole is determined;

[0028] Based on the location information of the restricted area, adjust the position of the water outlets located near the restricted area;

[0029] Based on the obtained location and height difference of the longitudinal bone joint, the high and low joint areas are identified, and drainage holes are excluded from being opened in these areas.

[0030] In one implementation, step S2 further includes the following steps:

[0031] Obtain the included angle between the two boundaries at the corner of the board, the board size parameters, and the board thickness parameters;

[0032] Based on the hole selection rules and the included angle, plate size parameters, and plate thickness parameters, adjust the size parameters of the matched corner holes.

[0033] As one implementation method, adjusting the dimensional parameters of the matched corner hole includes:

[0034] When the corner hole is a fan-shaped hole, the radius of the fan-shaped hole is adjusted based on the included angle;

[0035] Based on the aforementioned board size parameters, ensure that the corner hole size does not exceed one-quarter of the board size;

[0036] When the corner hole is a KS hole, the size of the KS hole is adjusted based on the plate thickness parameter.

[0037] As described above, the rule-based hull structure opening design method provided in this application has the following beneficial effects:

[0038] This application presents a rule-based method for designing hull structure openings. By systematically transforming standard specifications into explicit design rules and deeply integrating them with the 3D design environment, it constructs an efficient and reliable design process. This method significantly reduces reliance on designers' personal experience and manual reference, freeing them from tedious and repetitive judgment and modeling work. It not only greatly improves design efficiency but also fundamentally ensures the standardization and accuracy of opening design, effectively reducing the probability of design errors. This has a positive impact on improving the overall quality and level of digital ship design. Attached Figure Description

[0039] Figure 1 The diagram shows a flowchart of a rule-based hull structure opening design method according to an embodiment of the present invention.

[0040] Figure 2 The diagram shown is of the corner hole type.

[0041] Figure 3 This is a schematic diagram showing the type of water outlet.

[0042] Figure 4 The diagram shows three connection types: corner joint, butt joint, and free edge.

[0043] Figure 5 This is a schematic diagram of corner points that have required welding.

[0044] Figure 6 This diagram shows the location of the drainage hole at the toe end of the elbow plate.

[0045] Figure 7 This diagram shows the location of the drainage hole that must not be opened at the high-low connection point. Detailed Implementation

[0046] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0047] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0048] In the shipbuilding industry, digital design based on 3D models has become an industry trend. In hull structure design, to meet the requirements of weld continuity and functional aspects such as water flow and ventilation, corner holes and drainage holes are commonly required on structural components. However, due to the numerous specifications and complex intersections of hull parts, the design of these holes is cumbersome. Currently, the design process relies entirely on designers manually analyzing structural scenarios and making judgments and selections based on standard node drawings. This highly experience-dependent approach is not only inefficient but also fails to guarantee design accuracy, thus failing to meet the requirements of digital design development.

[0049] To address the aforementioned shortcomings, this application provides a rule-based method for designing hull structure openings. This application aims to achieve standardized design of hull structure openings by constructing a structured design rule system and integrating it with a three-dimensional design environment. The following embodiments provide a detailed description.

[0050] This embodiment provides a rule-based method for designing openings in ship hull structures, such as... Figure 1As shown, the method includes three steps:

[0051] S1. Define multiple types of openings according to the hull structure opening standard, and form an opening selection rule based on the three-dimensional information of parts;

[0052] S2. Select a target part in the three-dimensional model, obtain the three-dimensional information of the target part, and match the corresponding opening type and parameters for the target part based on the opening selection rule and the three-dimensional information of the target part;

[0053] S3. Generate an opening on the target part in the three-dimensional model according to the matched opening type and parameters.

[0054] Among them, step S1 is the basis of this design method, aiming to create a knowledge base for opening design available to computers.

[0055] First, systematically sort out the hull structure opening standard, which is systematically recorded in the "Hull Structure Opening Standard Node Atlas", and summarize and code the opening types in this atlas.

[0056] The opening types include corner holes and drain holes. Please refer to Figure 2 , the corner holes can be generally divided into three categories: fan-shaped holes, KS holes, and VU holes; please refer to Figure 3 , the drain hole types can be generally divided into three categories: round holes, HE holes, and HO holes. Optionally, each opening can be coded according to the opening size, and the coding format is opening type + opening size, such as R50, KS10, VU20*12, φ35, HE100X50, HO200X100 / R50, etc.

[0057] Secondly, sort out the application scenarios of each opening type to form an opening selection rule.

[0058] Specifically, for corner holes, the corner holes need to be set at the corner points of the plate: VU holes are used in areas where overwelding is required, KS holes are used in watertight fields and high-stress areas, and the remaining areas can use fan-shaped holes. The most widely used R50, KS10, and VU20*12 can be set as default values.

[0059] For drain holes, they are only set on longitudinal girder parts. It can be automatically matched according to the longitudinal girder height (D). For example, when 140mm ≤ D ≤ 160mm, the drain hole φ35 is selected; when 160mm < D ≤ 200mm, the drain hole HE80X40 is selected; when 200mm < D ≤ 300mm, the drain hole HE100X50 is selected; when 300mm < D ≤ 500mm, the drain hole HE150X75 is selected; when D > 500mm, the drain hole HO200X100 / R50 is selected. The most widely used φ35, HE100X50, and HO200X100 / R50 can be set as default values.

[0060] In step S2, in the design environment, the user selects the part that needs to be drilled (i.e. the target part), and the system automatically obtains the three-dimensional information of the part and matches the drilled type and parameters with the rule base constructed in step S1.

[0061] S21. The acquired three-dimensional part information includes, but is not limited to: the connection form between the boundary of the plate corner and the adjacent structure, the over-welding information of the plate corner, the part type, the part position, the position of the restricted area, the part size parameters, etc., which are used to automatically match corner holes or drainage holes.

[0062] Specifically, the connection form between the boundary at the corner of the board and the adjacent structure: such as Figure 4 As shown, there are three scenarios: corner joint, butt joint, and free edge. Each corner point consists of two boundaries. Corner holes are only required when the connection between the two boundaries and the adjacent structure is "both sides are corner joint", "one side is corner joint and the other side is butt joint", or "one side is corner joint and the other side is free edge".

[0063] Solder over-soldering information at the corners of the sheet metal: such as Figure 5 As shown, if a corner point is located at the joint of an adjacent part, it is considered that the corner point has undergone welding, and the corner hole at that corner point can only be a VU hole. Optionally, if the joint of the adjacent part has weld inspection requirements, the corner hole should be designed as VU50*35 or VU50*8; if the joint of the adjacent part does not have weld inspection requirements, the corner hole is set to the default value. Optionally, the assembly joints of the outer plate of the liquefied gas tank and the mid-longitudinal bulkhead of the liquefied gas carrier require inspection.

[0064] Part Types and Locations: Part types can be categorized as decks, outer plates, platform plates, ribs, longitudinal girder, and longitudinal skeletons. Fan-shaped holes and corner holes with dimensions of VUXX*35 or larger are not allowed at the corners of decks and outer plates, and drainage holes of any size are not permitted on decks and outer plates. Longitudinal skeleton parts only have drainage holes and no corner holes.

[0065] Determine if the corner of a sheet metal part is located at the liquid tank boundary: For corners located at the liquid tank boundary, fan-shaped holes and corner holes with dimensions of VUXX*35 or larger cannot be set. Optionally, the liquid tank boundary can be obtained by identifying the finite space model of the liquid tank boundary.

[0066] Determining whether a longitudinal rib component is partially or entirely located within the liquid tank: For longitudinal ribs partially or entirely located within the liquid tank, drainage holes need to be added. Optionally, whether a component is partially or entirely located within the liquid tank can be determined by identifying the relative position of the component to the finite space model of the liquid tank boundary.

[0067] Restricted area location information: The restricted area is the area 200mm in front of and 50mm behind the toe of the elbow plate. Drainage holes, fan-shaped holes, and corner holes with dimensions of VUXX*35 or larger cannot be installed in this area.

[0068] Obtain the shortest distance from the corner point to the rest of the board boundary. If this distance is less than 140mm, fan-shaped holes and corner holes with dimensions of VUXX*35 or higher cannot be set at the corner point.

[0069] S22. Obtain the three-dimensional material information, including the included angle between the two boundaries at the corner of the material, the material size parameters, and the material thickness parameters, which are used to adjust the size parameters of the corner holes.

[0070] Specifically, obtain the included angle between the two boundaries at the corner of the board: if the corner hole is a fan-shaped hole, when the included angle between the two boundaries is less than 45°, the size of the fan-shaped hole needs to be adjusted to R150; when the included angle between the two boundaries is between 45° and 60°, the size of the fan-shaped hole needs to be adjusted to R100; when the included angle between the two boundaries is greater than 60°, the size of the fan-shaped hole does not need to be adjusted.

[0071] Board size parameters: The corner hole size cannot exceed 1 / 4 of the board size. If it exceeds this range, the corner hole size must be adjusted to meet the requirements. The board size parameters can be obtained directly from step S21.

[0072] Plate thickness parameters: If the corner hole is a KS hole, in order to ensure the welding effect, when the plate thickness of the part is less than 15mm, the size of the KS hole does not need to be adjusted; when the plate thickness of the part is not less than 15mm, the corner hole needs to be adjusted to KS15.

[0073] S23. Obtain the position of the longitudinal bone component on its attached plate, the position of the strong rib plate through which the longitudinal bone component passes, and the position of the fillet weld between the longitudinal bone and its attached plate to determine the opening position of the drainage hole.

[0074] The position of the longitudinal rib component on its attached plate: When the longitudinal rib component is below the attached plate, no drainage hole is required. Specifically, the position of the longitudinal rib's center of gravity is identified through any cross-section, and the position of the fillet weld between the longitudinal rib and the attached plate is identified. By coordinate comparison, when the Z-coordinate value of the longitudinal rib's center of gravity is less than the Z-coordinate value of the fillet weld, the longitudinal rib component does not need to have a drainage hole.

[0075] Location of the longitudinal rib penetrating the strong rib plate: Determine the location where the longitudinal rib passes through the strong rib plate, and create drainage holes at positions XX mm forward and XX mm aft from this rib location. Specifically, if a drainage hole is located in a restricted area, move the drainage hole away from the toe of the elbow plate, to a position 350 mm from the toe of the elbow plate. Figure 6As shown. The location of the restricted area can be directly obtained from step S21. Specifically, obtain the location of the longitudinal girder butt joints for the entire ship, identify the height of the longitudinal girders on both sides of the butt weld, and when the heights of the longitudinal girders on both sides are inconsistent, obtain the high and low butt joint area. The range of the high and low butt joint area is the range of the higher longitudinal girder within 4 * the height difference of the longitudinal girders at the butt weld, and the minimum range is 200mm. Drainage holes cannot be opened in the high and low butt joint area. If a drainage hole is partially or entirely located in this area, the drainage hole is cancelled. Figure 7 As shown. Specifically, the liquid tank range is identified. If the obtained location of the water outlet is not within the liquid tank range, the water outlet at that location is cancelled. When the distance between two water outlets is less than 500mm, the X-coordinate of the center point of the water outlet is obtained, and the water outlet with the larger X value is cancelled.

[0076] Location of the fillet weld between the longitudinal bone and its attached plate: A drainage hole is made at a position 15mm away from the fillet weld between the longitudinal bone and its attached plate.

[0077] Step S3 involves, after matching and calculating the opening types, parameters, and locations of all target parts, generating standard-compliant 3D opening features on the corresponding parts of the 3D model in batches based on these results to complete the design process. This specifically includes:

[0078] S31. Based on the three-dimensional part information obtained in step S21, and in accordance with the hole selection rules outlined in step S1, automatically match the hole type.

[0079] S32. Based on the three-dimensional part information obtained in steps S22 and S23, automatically adjust the parameters matched to the opening in step 31.

[0080] S33. Based on steps S31 and S32, generate corner holes and drainage holes in batches.

[0081] This application achieves automation and intelligence in the design of hull structure openings through standardized and information-based methods, effectively overcoming the shortcomings of existing technologies.

[0082] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A rule-based method for designing openings in a ship's hull structure, characterized in that, Includes the following steps: S1. Based on the hull structure opening standards, define multiple opening types and form opening selection rules based on the three-dimensional information of the parts; S2. Select the target part in the 3D model, obtain the 3D information of the target part, and match the corresponding opening type and parameters for the target part based on the opening selection rules and the 3D information of the target part. S3. Generate openings on the target part in the three-dimensional model according to the matched opening type and parameters.

2. The method according to claim 1, characterized in that, In step S1, the standard for openings in the hull structure is recorded in the standard node drawing of the hull structure openings.

3. The method according to claim 1 or 2, characterized in that, Step S1 specifically includes: Each type of opening is coded, including corner holes and drainage holes; Based on the aforementioned hull structure opening standards, the application scenario conditions for each opening type are defined to form the opening selection rules.

4. The method according to claim 3, characterized in that, The types of corner holes include fan-shaped holes, KS holes, and VU holes; The types of drainage holes include round holes, HE holes, and HO holes.

5. The method according to claim 1, characterized in that, In step S2, the obtained three-dimensional information of the target part includes at least one of the following: The connection form of the plate corner boundary, the over-welding information at the corner, the part type, the part location information, the location information of the restricted area, the part size parameters, the position of the longitudinal bone on its attached plate frame, the location of the strong member through which the longitudinal bone passes, and the location of the fillet weld between the longitudinal bone and the plate frame.

6. The method according to claim 5, characterized in that, In step S2, based on the opening selection rules and the three-dimensional information of the target part, the corresponding opening type and parameters are matched for the target part, including: Based on the connection form of the two boundaries at the corner of the board, determine whether the corner needs to be opened with a corner hole; Based on the solder over-soldering information at the corner point, determine whether the corner hole type at the corner point is limited to VU hole; Based on the part type, determine whether the part is suitable for corner holes or drainage holes, and whether there are any opening restrictions.

7. The method according to claim 5, characterized in that, In step S2, based on the opening selection rules and the three-dimensional information of the target part, the corresponding opening type and parameters are matched for the target part, including: Based on the part location information, determine whether the part is located at the liquid tank boundary or inside the liquid tank, and adjust the opening type or decide whether to open a water flow hole accordingly. Based on the location information of the restricted area, specific types of openings are excluded from being installed within the restricted area; Based on the part size parameters, determine whether the distance from the corner point to the plate boundary meets the opening conditions for a specific type of corner hole.

8. The method according to claim 5, characterized in that, The method further includes a step of determining the location of the water outlet, which includes: Based on the position of the longitudinal bone on its attachment plate, determine whether it is necessary to open a drainage hole; Based on the location of the strong component through which the longitudinal bone passes, the reference area for opening the drainage hole is determined; Based on the location information of the restricted area, adjust the position of the water outlets located near the restricted area; Based on the obtained location and height difference of the longitudinal bone joint, the high and low joint areas are identified, and drainage holes are excluded from being opened in these areas.

9. The method according to claim 8, characterized in that, Step S2 also includes the following steps: Obtain the included angle between the two boundaries at the corner of the board, the board size parameters, and the board thickness parameters; Based on the hole selection rules and the included angle, plate size parameters, and plate thickness parameters, adjust the size parameters of the matched corner holes.

10. The method according to claim 9, characterized in that, Adjusting the dimensions of the matched corner holes includes: When the corner hole is a fan-shaped hole, the radius of the fan-shaped hole is adjusted based on the included angle; Based on the aforementioned board size parameters, ensure that the corner hole size does not exceed one-quarter of the board size; When the corner hole is a KS hole, the size of the KS hole is adjusted based on the plate thickness parameter.

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