Ship model transformation matching method and matching system

Abstract

The invention relates to a ship model transformation matching method, which is used for matching a ship model stored in a ship model database with a target ship model, and comprises the following steps: S1, determining a matching strategy of an alternative ship model and the target ship model; s2, according to the matching strategy determined in the step S1, an alternative ship model suitable for transformation is retrieved in a ship model database; s3, establishing a three-dimensional comparison model of the alternative ship model and the target ship model; s4, establishing a dot matrix comparison model of the alternative ship model and the target ship model; s5, establishing a molded line comparison graph of the alternative ship model and the target ship model according to the three-dimensional comparison model; and S6, establishing at least one of an offset cloud picture and an offset ratio picture according to the dot matrix comparison model. According to the ship model transformation matching method, the technical problems that an inventory ship model is destroyed, and processing of a new ship model cannot meet experiment arrangement in time can be solved.

Description

Technical Field

[0001] The invention relates to the field of ship models, and in particular to a ship model transformation and matching method and a matching system. Background Art

[0002] Ship research institutions need to process a large number of ship models every year. The normal ship model test cycle is usually less than half a year. After all the tests are completed, after a one-year inventory period, the ship models need to be destroyed due to storage conditions, resulting in a large amount of resource waste. At the same time, the processing of new ship models requires drawing, cutting, cutting, painting and other process flows, and the processing cycle is long. It often happens that the ship model processing cannot meet the test schedule in time. Summary of the invention

[0003] The present invention provides a ship model transformation and matching method, which can overcome the technical problem that the inventory ship models are destroyed, but the processing of new ship models cannot meet the experimental arrangements in time. The ship model transformation and matching method of the present invention can match the inventory ship models with new ship models. After successful matching, the inventory ship models can be used to transform and process new ship models, thereby reducing the waste of inventory ship models and shortening the processing cycle of new ship models.

[0004] The ship model transformation and matching method of the present invention matches the ship model stored in the ship model database with the target ship model, comprising the following steps:

[0005] S1, determining the matching strategy between the candidate ship model and the target ship model;

[0006] S2, according to the matching strategy determined in step S1, searching for an alternative ship model suitable for transformation in a ship model database;

[0007] S3, establishing a three-dimensional comparison model between the candidate ship model and the target ship model;

[0008] S4, establishing a dot matrix comparison model between the candidate ship model and the target ship model;

[0009] S5, establishing a line comparison diagram between the candidate ship model and the target ship model according to the three-dimensional comparison model;

[0010] S6, establishing at least one of an offset cloud map and an offset ratio map according to the dot matrix comparison model.

[0011] 2. The ship model modification and matching method according to claim 1 is characterized in that the matching strategy of step S1 includes determining the propulsion mode, square coefficient, and aspect ratio of the target ship model based on the existing actual ship, and matching the alternative ship model based on the propulsion mode, square coefficient, and aspect ratio of the target ship model, requiring the alternative ship model to have the same propulsion mode as the target ship model, the square coefficient of the alternative ship model to be 90%-110% of the square coefficient of the target ship model, and the aspect ratio of the alternative ship model to be 90%-110% of the aspect ratio of the target ship model.

[0012] Preferably, the matching strategy of step S1 also includes: when the scale ratio of the target ship model has been determined, the length and width of the target ship model are calculated according to the main dimensions of the actual ship and the scale ratio of the target ship model, and the difference between the width of the alternative ship model and the width of the target ship model is required to be within a set range, and the difference between the length of the alternative ship model and the length of the target ship model is required to be within a set range.

[0013] Preferably, the width of the alternative ship model is 0-4 cm greater than the width of the target ship model, and the length of the alternative ship model is ±20 cm of the length of the target ship model.

[0014] Preferably, when the scale ratio of the target ship model is not determined, the scale ratio S=W / w of the target ship model is calculated, wherein S is the scale ratio of the target ship model, W is the width of the actual ship, and w is the width of the alternative model. The length l1=L / S and the mold depth t1=T / S of the target ship model are calculated, wherein L is the length of the actual ship, and T is the mold depth of the actual ship. The three-dimensional model of the target ship model is automatically generated according to the information of the target ship model and its storage address is displayed.

[0015] Preferably, step S2 also includes: displaying information of the target ship model and information of the alternative ship model, calculating and displaying the difference between the length of the target ship model and the length of the alternative ship model, calculating and displaying the difference between the width of the target ship model and the width of the alternative ship model, and displaying the IGS model of the alternative ship model.

[0016] Preferably, in step S3, the intersection of the 0 station, baseline and mid-longitudinal section of the three-dimensional model of the target ship model is used as the coordinate origin, the bow direction is the x-axis, and the upward direction is the z-axis; the intersection of the 0 station, baseline and mid-longitudinal section of the three-dimensional model of the alternative ship model is used as the coordinate origin, the bow direction is the x-axis, and the upward direction is the z-axis. The coordinate origin of the three-dimensional model of the target ship model is overlapped with the coordinate origin of the three-dimensional model of the alternative ship model to form a three-dimensional comparison model of the target ship model and the alternative ship model. In the three-dimensional comparison model, the color of the three-dimensional model of the target ship model is different from the color of the three-dimensional model of the alternative ship model.

[0017] Preferably, step S4 includes: establishing a lattice comparison model between the target ship model and the alternative ship model, specifically including: in the three-dimensional comparison model, making a cross-section line of the three-dimensional model of the target ship model at a horizontal interval s, making a waterline of the three-dimensional model of the target ship model at an interval of a vertical distance h in the z-axis direction, and the intersection of the cross-section line of the three-dimensional model of the target ship model and the waterline constitutes the target ship model lattice model; making a cross-section line of the three-dimensional model of the alternative ship model at a horizontal interval s, making a waterline of the three-dimensional surface model of the alternative ship model at an interval of a vertical distance h in the z-axis direction, and the intersection of the cross-section line of the three-dimensional model of the alternative ship model and the waterline constitutes the alternative ship model lattice model, and the target ship model lattice model and the alternative ship model lattice model together form a lattice comparison model of the target ship model and the alternative ship model.

[0018] Preferably, the horizontal interval s is 0.3-1 station of the target ship model, and the vertical distance h is 3-10 cm.

[0019] Preferably, in step S5, the three-dimensional comparison model is sectioned along different cross-sectional lines to form multiple cross-sectional lines of the three-dimensional model of the target ship model and the three-dimensional model of the alternative ship model, the multiple cross-sectional lines form a cross-sectional line comparison diagram, and the color of the cross-sectional lines of the three-dimensional model of the target ship model is different from the color of the cross-sectional lines of the three-dimensional model of the alternative ship model; and or the dot matrix comparison model is sectioned along different waterlines to form multiple waterline lines of the three-dimensional model of the target ship model and the three-dimensional model of the alternative ship model, the multiple waterline lines form a waterline line comparison diagram, and the color of the waterline lines of the three-dimensional model of the target ship model is different from the color of the waterline lines of the three-dimensional model of the alternative ship model.

[0020] Preferably, in step S6, an offset ratio diagram is established based on the dot matrix comparison model, and the offset ratio diagram displays statistical parameters of corresponding point offsets of the alternative ship model relative to the target ship model, and the statistical parameters include maximum value, minimum value, average value and distribution diagram.

[0021] Preferably, the matching method also includes S7, pre-determining whether the alternative ship model can be used as a ship model for transformation, specifically: quantifying the size of the offset between the corresponding points of the alternative ship model and the offset distribution range relative to the target ship model, and setting a standard matching value, when the matching degree of a certain alternative ship model reaches the standard matching value, it is determined that the alternative ship model can be used as a ship model for transformation, and when the matching degrees of all alternative ship models do not reach the standard matching value, it is determined that no alternative ship model can be used as a ship model for transformation.

[0022] Preferably, the matching method further comprises step S8, inputting information of the target ship model transformed according to the alternative ship model into the ship model database or inputting information of the newly manufactured target ship model into the ship model database when there is no alternative ship model available as the ship model for transformation.

[0023] The present invention also provides a ship model transformation and matching system, which matches the ship model through the above-mentioned ship model transformation and matching method, and the ship model transformation and matching system comprises:

[0024] Ship model database, storing information of existing ship models;

[0025] A preliminary search module searches for candidate ship models matching the target ship model in the ship model database and displays information of the candidate ship models;

[0026] The matching evaluation module generates and displays the three-dimensional comparison model and dot matrix comparison model between the candidate ship model and the target ship model;

[0027] The report module generates one or more of an offset ratio diagram, an offset cloud diagram and a type line comparison diagram according to the dot matrix comparison model and displays them.

[0028] Preferably, the ship model information stored in the ship model database includes: ship model ID, project group to which the ship model belongs, ship model type, propulsion method, ship model IGS model, line drawing, ship model status, scale ratio and length, width and depth of the ship model.

[0029] Preferably, the matching system further comprises a pre-determination module for pre-determining whether the candidate ship model can be used to transform the target ship model.

[0030] Compared with the prior art, the present invention has the following beneficial effects: through the ship model transformation and matching method and matching system of the present invention, it is possible to quickly retrieve spare ship models from all existing ship models, and the matching degree between the candidate ship model and the target ship model can be intuitively evaluated through the three-dimensional model comparison diagram of the candidate ship model and the target ship model. Through the report module, the matching degree between the candidate ship model and the target ship model can be evaluated from specific data, and the workload required for transforming the candidate ship model can be predicted. The matching system provides a way to quickly and accurately match the target ship model within the range of all inventory ship models. If the matching is successful, the processing cycle of the new ship model can be greatly shortened and the waste of inventory ship models can be reduced. If the matching is unsuccessful, it can also avoid the staff from spending a lot of time searching for inventory ship models, and wasting time and energy by communicating back and forth between different project groups and ship model processing workshops. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The figure is a schematic diagram of the structure of a ship model modification and matching system according to an embodiment of the present invention.

[0032] Figure 2 The present invention is a flow chart of a ship model modification and matching method according to an embodiment of the present invention.

[0033] Figure 3 The interface of the ship model database of the ship model modification and matching system of one embodiment of the present invention.

[0034] Figure 4 The invention provides an interface for inputting matching strategies for a preliminary search module of a ship model reconstruction matching system according to an embodiment of the present invention.

[0035] Figure 5 This is a search result interface of a preliminary search module of a ship model modification matching system according to an embodiment of the present invention.

[0036] Figure 6 This is a three-dimensional model comparison diagram interface generated by a matching degree evaluation module of a ship model reconstruction matching system according to an embodiment of the present invention.

[0037] Figure 7This is an interface of an offset ratio diagram generated by a reporting module of a ship model transformation and matching system according to an embodiment of the present invention.

[0038] Figure 8 This is an interface of a cross-section line comparison diagram generated by a report module of a ship model reconstruction and matching system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0039] The present invention provides a ship model modification matching system, such as Figure 1 As shown, including:

[0040] Ship model database, which stores the information of existing ship models. Its interface is as follows Figure 3 As shown;

[0041] A preliminary search module, through which an alternative ship model matching the target ship model can be searched in the ship model database and information of the alternative ship model can be displayed;

[0042] The matching evaluation module generates and displays the three-dimensional comparison model and dot matrix comparison model between the candidate ship model and the target ship model;

[0043] Report module, generates offset ratio map based on the dot matrix comparison model (see Figure 7 ), offset cloud diagram (not shown) and profile comparison diagram (see Figure 8 ) and display them.

[0044] Through the ship model transformation and matching system of the present invention, it is possible to quickly retrieve spare ship models from all existing ship models, and the matching degree of the candidate ship model and the target ship model can be intuitively evaluated through the three-dimensional model comparison diagram of the candidate ship model and the target ship model. Through the report module, the matching degree of the candidate ship model and the target ship model can be evaluated from specific data, and the workload required for transforming the candidate ship model can be predicted. The matching system provides a way to quickly and accurately match the target ship model within the range of all inventory ship models. If the matching is successful, the processing cycle of the new ship model can be greatly shortened and the waste of inventory ship models can be reduced. If the matching is unsuccessful, it can also avoid the staff from spending a lot of time searching for inventory ship models, and wasting time and energy communicating back and forth between different project groups and ship model processing workshops.

[0045] In this embodiment, the matching system also includes a pre-determination module for pre-determining whether the alternative ship model can be used to transform the target ship model and an input module for inputting the data of the newly manufactured module into the ship model database. The determination result of the pre-determination module can be used as the final determination result, and can also be used as a reference for manual determination by experienced masters in the ship model processing workshop. Alternatively, the pre-determination module may not be set, and the experienced masters in the ship model processing workshop can make the determination based on the matching evaluation module and the report module. In this embodiment, the determination result of the pre-determination module is used as a reference for the final determination. The data of the newly manufactured module is input into the ship model database through the input module as the information of the inventory ship model, so that the new ship model can be used as a future alternative ship model.

[0046] In this embodiment, the information of the ship model stored in the ship model database includes: ship model ID, project group, ship model type, propulsion mode, ship model IGS model, line diagram, ship model status, scale ratio, and length, width and depth of the ship model. The ship model type is one of bulk carrier, container ship, oil tanker, gas tanker or others, the propulsion mode is one of single skeg, double skeg or others, and the ship model status is one of under test, to be destroyed and destroyed. The project group can also be replaced by the information of the person in charge of the project group to which the ship model belongs.

[0047] The present invention also provides a ship model transformation and matching method, which matches the ship model stored in the ship model database with the target ship model. In this embodiment, the matching method is implemented by the above-mentioned ship model transformation and matching system, but it should be noted that the ship model transformation and matching method of the present invention is not only implemented by the ship model transformation and matching system of the present invention. Figure 3-8 These are all interfaces of the ship model transformation and matching system for ship model transformation and matching methods, including the following steps:

[0048] S1, determine the matching strategy between the target ship model and the alternative ship model; the matching strategy of step S1 includes determining the propulsion mode, square coefficient, and aspect ratio of the target ship model according to the existing actual ship, and matching the alternative ship model according to the propulsion mode, square coefficient, and aspect ratio of the target ship model, requiring the alternative ship model to have the same propulsion mode as the target ship model, the square coefficient of the alternative ship model to be 90%-110% of the square coefficient of the target ship model, and the aspect ratio of the alternative ship model to be 90%-110% of the aspect ratio of the target ship model; the matching strategy of step S1 also includes: when the target ship model has a three-dimensional model, the scale ratio of the target ship model has been determined at this time, the length and width of the target ship model are calculated according to the main dimensions of the actual ship and the scale ratio of the target ship model, and the difference between the width of the alternative ship model and the width of the target ship model is required to be within a set range, and the difference between the length of the alternative ship model and the length of the target ship model is required to be within a set range. In this embodiment, the width of the candidate ship model is 0-4 cm greater than the width of the target ship model, and the length of the candidate ship model is ±20 cm of the length of the target ship model.

[0049] S2, according to the matching strategy determined in step S1, such as Figure 4 As shown, the alternative ship model suitable for transformation is retrieved in the ship model database through the retrieval module; when the scale ratio of the target ship model is not determined, the scale ratio S=W / w of the target ship model is calculated according to the width of the alternative ship model, wherein S is the scale ratio of the target ship model, W is the width of the actual ship, and w is the width of the alternative model, and the length l1=L / S and the mold depth t1=T / S of the target ship model are calculated, wherein L is the length of the actual ship, and T is the mold depth of the actual ship, and the three-dimensional model of the target ship model is automatically generated according to the information of the target ship model and its storage address is displayed; step S2 also includes: displaying the information of the target ship model and the information of the alternative ship model, calculating and displaying the difference between the length of the target ship model and the length of the alternative ship model, calculating and displaying the difference between the width of the target ship model and the width of the alternative ship model, and displaying the IGS model of the alternative ship model.

[0050] S3, establish and display the three-dimensional comparison model of the target ship model and the alternative ship model through the matching evaluation module, specifically: take the intersection of the 0 station, baseline, and mid-longitudinal section of the three-dimensional model of the target ship model as the coordinate origin, usually divide the vertical length of the ship (i.e. the length between the stern column and the bow column) into 20 equal parts, each length is the station distance, and the stern column is the 0 station. The bow direction of the ship is the x-axis, and the upward direction is the z-axis. Take the intersection of the 0 station, baseline, and mid-longitudinal section of the three-dimensional model of the alternative ship model as the coordinate origin, the bow direction of the ship is the x-axis, and the upward direction is the z-axis. The coordinate origin of the three-dimensional model of the target ship model is overlapped with the coordinate origin of the three-dimensional model of the alternative ship model to form a three-dimensional comparison model of the target ship model and the alternative ship model, such as Figure 6 As shown in the left figure in FIG. 1 , the color of the 3D model of the target ship model is different from the color of the 3D model of the candidate ship model in the 3D comparison model.

[0051] S4, establishing and displaying a dot matrix comparison model between the candidate ship model and the target ship model through a matching evaluation module, specifically including: in the three-dimensional comparison model, making a cross-section line of the three-dimensional model of the target ship model at a horizontal interval s, making a waterline of the three-dimensional model of the target ship model at an interval of a vertical distance h in the z-axis direction, and the intersection of the cross-section line of the three-dimensional model of the target ship model and the waterline constitutes a dot matrix model of the target ship model; making a cross-section line of the three-dimensional model of the backup ship model at a horizontal interval s, making a waterline of the three-dimensional surface model of the candidate ship model at an interval of a vertical distance h in the z-axis direction, and the intersection of the cross-section line of the three-dimensional model of the candidate ship model and the waterline constitutes a dot matrix model of the candidate ship model, and the dot matrix model of the target ship model and the dot matrix model of the candidate ship model together form a dot matrix comparison model of the target ship model and the candidate ship model, such as Figure 6 As shown in the right figure.

[0052] In this embodiment, the horizontal interval s is used as the cross-section line with the 0.5 station interval of the target ship model. Of course, in other embodiments, other sizes of horizontal intervals s can also be set, generally within 1 station interval, such as 0.4, 0.7 or 0.9 stations. The vertical distance h is generally 3-10cm. Of course, the smaller the interval selected, the denser the cross-section line and the waterline, and the denser the intersection points. In this embodiment, the vertical distance h is 5cm.

[0053] In step S5, the three-dimensional comparison model is cut along different cross-section lines by the reporting module to form a plurality of cross-section lines of the three-dimensional model of the target ship model and the three-dimensional model of the candidate ship model, and the plurality of cross-section lines form a cross-section line comparison diagram, such as Figure 8 As shown, the color of the cross-sectional lines of the three-dimensional model of the target ship model is different from the color of the cross-sectional lines of the three-dimensional model of the candidate ship model.

[0054] The three-dimensional comparison model can also be sectioned along different waterlines to form multiple waterline lines of the three-dimensional model of the target ship model and the three-dimensional model of the alternative ship model (not shown in the figure). The multiple waterline lines form a waterline line comparison diagram, and the color of the waterline lines of the three-dimensional model of the target ship model is different from the color of the waterline lines of the three-dimensional model of the alternative ship model.

[0055] In step S6, at least one of an offset cloud map (not shown in the figure) and an offset ratio map is established according to the dot matrix comparison model by the reporting module, wherein the offset is the difference in coordinates of the points at the same position of the candidate ship model and the target ship model dot matrix model. Figure 7 As shown, the statistical parameters of the corresponding point offset of the candidate ship model relative to the target ship model can be displayed, and the statistical parameters include the maximum value, minimum value, average value and distribution diagram, and the distribution diagram is graded by 1 cm. The "same point" and "corresponding point" refer to two points with the same x-axis and z-axis coordinates but different y-axis coordinates, and the offset refers to the difference in the y-axis coordinates of the two points.

[0056] S7 pre-determines whether the alternative ship model can be used as a ship model for transformation, specifically: quantify the size of the offset between the corresponding points of the alternative ship model and the offset distribution range relative to the target ship model, and set the standard matching value. When the matching degree of a certain alternative ship model reaches the standard matching value, it is determined that the alternative ship model can be used as a ship model for transformation. When the matching degrees of all alternative ship models do not reach the standard matching value, it is determined that no alternative ship model can be used as a ship model for transformation. This step is used to pre-determine whether the alternative ship model can be transformed into the target ship model. This step can be replaced by manual judgment by experienced processing masters, or the results of the pre-determination can be used as a reference for the processing master to make the final judgment;

[0057] S8, inputting the information of the target ship model after transformation according to the alternative ship model into the ship model database, or inputting the information of the newly manufactured target ship model into the ship model database when there is no alternative ship model available as the ship model for transformation, so that the target ship model is used as a stock ship model.

[0058] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Various modifications or equivalent substitutions made by those skilled in the art to the present invention within the essence and protection scope of the present invention also fall within the protection scope of the present invention.

Claims

1. A ship model modification and matching method, characterized in that: Match the ship model stored in the ship model database with the target ship model. The following steps are involved: S1, determining the matching strategy between the candidate ship model and the target ship model; S2, according to the matching strategy determined in step S1, searching for an alternative ship model suitable for transformation in a ship model database; S3, establishing a three-dimensional comparison model between the candidate ship model and the target ship model; S4, establishing a dot matrix comparison model between the candidate ship model and the target ship model; S5, establishing a line comparison diagram between the candidate ship model and the target ship model according to the three-dimensional comparison model; S6, establishing at least one of an offset cloud map and an offset ratio map according to the dot matrix comparison model.

2. The ship model transformation and matching method according to claim 1, characterized in that: The matching strategy of step S1 includes determining the propulsion mode, square coefficient, and aspect ratio of the target ship model based on the existing actual ship, and matching the alternative ship model based on the propulsion mode, square coefficient, and aspect ratio of the target ship model, requiring the alternative ship model to have the same propulsion mode as the target ship model, the square coefficient of the alternative ship model to be 90%-110% of the square coefficient of the target ship model, and the aspect ratio of the alternative ship model to be 90%-110% of the aspect ratio of the target ship model.

3. The ship model transformation and matching method according to claim 2, characterized in that: The matching strategy of step S1 also includes: when the scale ratio of the target ship model has been determined, the length and width of the target ship model are calculated according to the main dimensions of the actual ship and the scale ratio of the target ship model, and the difference between the width of the alternative ship model and the width of the target ship model is required to be within a set range, and the difference between the length of the alternative ship model and the length of the target ship model is required to be within a set range.

4. The ship model transformation and matching method according to claim 2, characterized in that: The width of the alternative ship model is 0-4 cm larger than the width of the target ship model, and the length of the alternative ship model is ±20 cm of the length of the target ship model.

5. The ship model transformation and matching method according to claim 2, characterized in that: When the scale ratio of the target ship model is not determined, the scale ratio S=W / w of the target ship model is calculated, where S is the scale ratio of the target ship model, W is the width of the actual ship, and w is the width of the alternative model. The length l1=L / S and the mold depth t1=T / S of the target ship model are calculated, where L is the length of the actual ship and T is the mold depth of the actual ship. The three-dimensional model of the target ship model is automatically generated according to the information of the target ship model and its storage address is displayed.

6. The ship model transformation and matching method according to claim 3 or 5, characterized in that: Step S2 also includes: displaying information of the target ship model and information of the alternative ship model, calculating and displaying the difference between the length of the target ship model and the length of the alternative ship model, calculating and displaying the difference between the width of the target ship model and the width of the alternative ship model, and displaying the IGS model of the alternative ship model.

7. The ship model modification and matching method according to claim 3 or 5, characterized in that: In step S3, the intersection of the 0 station, baseline and mid-longitudinal section of the three-dimensional model of the target ship model is taken as the coordinate origin, the bow direction is the x-axis, and the upward direction is the z-axis. The intersection of the 0 station, baseline and mid-longitudinal section of the three-dimensional model of the alternative ship model is taken as the coordinate origin, the bow direction is the x-axis, and the upward direction is the z-axis. The coordinate origin of the three-dimensional model of the target ship model is overlapped with the coordinate origin of the three-dimensional model of the alternative ship model to form a three-dimensional comparison model of the target ship model and the alternative ship model. In the three-dimensional comparison model, the color of the three-dimensional model of the target ship model is different from the color of the three-dimensional model of the alternative ship model.

8. The ship model transformation and matching method according to claim 7, characterized in that: Step S4 includes: establishing a lattice comparison model between the target ship model and the alternative ship model, specifically including: in the three-dimensional comparison model, making a cross-section line of the three-dimensional model of the target ship model at a horizontal interval s, making a waterline of the three-dimensional model of the target ship model at an interval of a vertical distance h in the z-axis direction, and the intersection of the cross-section line of the three-dimensional model of the target ship model and the waterline constitutes the target ship model lattice model; making a cross-section line of the three-dimensional model of the alternative ship model at a horizontal interval s, making a waterline of the three-dimensional surface model of the alternative ship model at an interval of a vertical distance h in the z-axis direction, and the intersection of the cross-section line of the three-dimensional model of the alternative ship model and the waterline constitutes the alternative ship model lattice model, and the target ship model lattice model and the alternative ship model lattice model together form a lattice comparison model of the target ship model and the alternative ship model.

9. The ship model transformation and matching method according to claim 8, characterized in that: The horizontal interval s is 0.3-1 station of the target ship model, and the vertical distance h is 3-10 cm.

10. The ship model transformation and matching method according to claim 8, characterized in that: In step S5, the three-dimensional comparison model is sectioned along different cross-sectional lines to form multiple cross-sectional lines of the three-dimensional model of the target ship model and the three-dimensional model of the alternative ship model, and the multiple cross-sectional lines form a cross-sectional line comparison diagram, and the color of the cross-sectional lines of the three-dimensional model of the target ship model is different from the color of the cross-sectional lines of the three-dimensional model of the alternative ship model; and or the dot matrix comparison model is sectioned along different waterlines to form multiple waterline lines of the three-dimensional model of the target ship model and the three-dimensional model of the alternative ship model, and the multiple waterline lines form a waterline line comparison diagram, and the color of the waterline lines of the three-dimensional model of the target ship model is different from the color of the waterline lines of the three-dimensional model of the alternative ship model.

11. The ship model modification and matching method according to claim 10, characterized in that: In step S6, an offset ratio diagram is established according to the dot matrix comparison model. The offset ratio diagram displays statistical parameters of corresponding point offsets of the candidate ship model relative to the target ship model. The statistical parameters include maximum value, minimum value, average value and distribution diagram.

12. The ship model modification and matching method according to claim 11, characterized in that: The matching method also includes S7, pre-determining whether the alternative ship model can be used as the ship model for transformation, specifically: quantifying the size of the offset between the corresponding points of the alternative ship model and the offset distribution range relative to the target ship model, and setting a standard matching value, when the matching degree of a certain alternative ship model reaches the standard matching value, it is determined that the alternative ship model can be used as the ship model for transformation, and when the matching degrees of all alternative ship models do not reach the standard matching value, it is determined that no alternative ship model can be used as the ship model for transformation.

13. The ship model transformation and matching method according to claim 12, characterized in that: The matching method further comprises step S8, inputting information of the target ship model transformed according to the alternative ship model into the ship model database or inputting information of the newly manufactured target ship model into the ship model database when there is no alternative ship model available as the ship model for transformation.

14. A ship model modification and matching system, characterized in that: The ship model is matched by the ship model transformation and matching method according to any one of claims 1 to 13, and the ship model transformation and matching system comprises: Ship model database, storing information of existing ship models; A preliminary search module searches for candidate ship models matching the target ship model in the ship model database and displays information of the candidate ship models; The matching evaluation module generates and displays the three-dimensional comparison model and dot matrix comparison model between the candidate ship model and the target ship model; The report module generates one or more of an offset ratio diagram, an offset cloud diagram and a type line comparison diagram according to the dot matrix comparison model and displays them.

15. The ship model transformation and matching system according to claim 14, characterized in that: The ship model information stored in the ship model database includes: ship model ID, project group to which the ship model belongs, ship model type, propulsion method, ship model IGS model, line drawing, ship model status, scale ratio and length, width and depth of the ship model.

16. The ship model transformation and matching system according to claim 14, characterized in that: The matching system also includes a pre-determination module for pre-determining whether the candidate ship model can be used to transform the target ship model.

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