Ship structure flaw detection layout diagram generation method based on three-dimensional model

Abstract

A ship structure flaw detection layout diagram generation method based on a three-dimensional model comprises the steps that structure types are divided into three types according to Gen file content in an AM model, the structure types are divided into three grades according to structure type information, and basic information of welding seams is output in combination with information of the AM model; and performing parametric configuration on the flaw detection method, the flaw detection reference length, the flaw detection proportion and the weld joint reference length to realize efficient point distribution of the weld joint flaw detection layout diagram. On an AVEVA Marine platform, definition and output of basic information of a weld joint are achieved through programming of a development tool C #, and input of information needed for weld joint flaw detection arrangement calculation is generated. Flaw detection arrangement information can be processed, project configuration can be carried out according to different flaw detection arrangement requirements, an efficient point distribution algorithm of a weld flaw detection arrangement diagram is achieved, and automatic output of the weld flaw detection arrangement diagram is achieved.

Description

Technical Field

[0001] The invention belongs to the field of marine ship design and construction, and in particular relates to a method for generating a ship structure flaw detection arrangement diagram based on a three-dimensional model. Background Art

[0002] At present, most of the structures of ship products are welded, and a large number of welds need to be inspected by flaw detection. Depending on the ship type, classification society, and shipowner, the flaw detection ratio, layout rules, and flaw detection method requirements are not the same. The drawing of the flaw detection layout can only rely on experienced quality control personnel to judge and compile according to the ship structure form, specification requirements and their own experience. During this period, a large number of relevant drawings and documents need to be consulted, especially for offshore engineering projects that will never be docked. All welds need to be tracked and traced. The welding quality requirements are high, the number of welds is large, and the flaw detection ratio is high. The traditional weld flaw detection layout drawing work is a very large and error-prone task, and an efficient and accurate method is urgently needed to replace it. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a method for generating a ship structure flaw detection arrangement diagram based on a three-dimensional model, aiming to achieve the purpose of quickly and accurately identifying the weld flaw detection arrangement. The technical solution adopted is:

[0004] S1: "Structural category" is an important basis for the detection ratio division. There is no attribute definition method in the conventional design model. Since the structural category division requires professional designers to judge according to the importance of the structure in the early stage of design, it is necessary to set it in the AVEVA Marine (hereinafter referred to as AM) design platform, and it is necessary to add this attribute definition method. The structural category definition is divided into special structure (Structural category) I, main structure (Structural category) II, and secondary structure (Structural category) III. According to the structural category information input in the modeling of the AM platform, the corresponding structural category can be extracted in the output model file.

[0005] S2: Weld grade. Weld grade is the grade of flaw detection and is divided into three types (Class I, Class II and Class III). It is further divided into two judgment conditions according to different weld types. The correspondence between structure type and weld grade is as follows, so as to obtain weld grade information. Each grade corresponds to different weld types. The weld types corresponding to Class I are, among all welds, butt & fillet full penetration or fillet half penetration & ordinary fillet welds; the weld types corresponding to Class II are, among all welds except Class I, butt & fillet full penetration or fillet half penetration & ordinary fillet welds; the weld types corresponding to Class III are, among all welds except Class I and Class II, butt & fillet full penetration or fillet half penetration & ordinary fillet welds.

[0006] S3: Based on the classification of the AM model structure type and combined with the information of the AM model itself, the basic information of the weld is output: weld number, assembly stage, welding method, welding type, weld leg length, part name, material, specification, and structural grade of the connecting and connected parts. Among them, the basic information is obtained based on the AM model, and the weld serial number, weld grade, and weld connection form are established according to the connection relationship between the models.

[0007] S4: Parameterize the flaw detection method, flaw detection reference length, flaw detection ratio and weld reference length. The commonly used flaw detection methods in shipbuilding engineering are RT, UT and MT. Among them, one flaw detection point represents that a weld within a fixed length needs to be inspected. For example, a 10m long weld needs to have one RT point (the length of one point is tentatively set to 300mm), which means that a 300mm position in this weld needs to be randomly found for RT flaw detection, and UT and MT are similar.

[0008] (1) The flaw detection method and the flaw detection reference length configuration are:

[0009] Detection method RT, detection reference length, 1 point = 300mm, shortest point length = 50mm.

[0010] The flaw detection method is UT, the flaw detection reference length is 1 point = 500mm, and the shortest point length is 150mm.

[0011] Detection method MT, detection reference length, 1 point = 500mm, shortest point length = 75mm.

[0012] (2) The flaw detection ratio configuration is:

[0013] For different weld grades (Class I, Class II, Class III), weld types (butt full penetration, fillet full penetration, fillet half penetration, common fillet weld), the detection ratios of different detection methods (RT, UT, MT) are configurable. The corresponding weld reference length (the shortest weld length that needs to be inspected) is also configurable. For example, the interpretation of the RT detection ratio of 5% and the weld reference length of 5000mm in Class I is: in all Class I welds, the total length of RT must be 5% of the length of all Class I welds, and RT must be arranged only in welds with a length greater than 5000mm.

[0014] S5: Achieve efficient layout of weld flaw detection layout,

[0015] (1) First define the applicable conditions of the flaw detection method. If the "weld type" is a butt weld, the thickness of the "connector" or "connected part", whichever is smaller, is greater than or equal to 40.0 mm, the "flaw detection method" RT does not require point distribution. If the thickness of the "connector" or "connected part", whichever is smaller, is less than 8.0 mm, the "flaw detection method" UT does not require point distribution.

[0016] (2) The efficient detection points are classified into two categories: one is the welds within the segment, and the other is the overall group and closed welds.

[0017] The welding seams in sections are carried out as follows:

[0018] aFor "parametric configuration", the flaw detection ratio and flaw detection method of a certain type of weld (Class I or Class II or Class III) are arranged with priority to the "+" and "T" weld intersection points; each time a point is arranged, it is judged whether the length of the point meets the flaw detection ratio value, and the point arrangement is completed if it meets the ratio.

[0019] bFor "parametric configuration", the flaw detection ratio and flaw detection method of a certain type of weld (Class I or Class II or Class III) are used to arrange the points from high to low weld length until the reference length is reached. Then, the second and third rounds are arranged according to the same rules. For each arranged point, it is judged whether the length of the arranged point meets the flaw detection ratio value. If it meets the ratio, the arrangement is completed.

[0020] c. Prioritize the flaw detection methods: arrange in the order of RT, UT, and MT. RT and UT should not be arranged on the same weld at the same time, except for the 100% distribution ratio; MT distribution weld is equal to RT distribution weld plus UT distribution weld.

[0021] d Before arranging the reference length, preliminarily determine the reference length value based on the order of the weld lengths.

[0022] When the flaw detection ratio is low, that is, the number of welds that need to be distributed is small and it is difficult to meet the general needs, the flaw detection should be evenly distributed. For the total group and the closing seam, the ratio between the plate frame and the plate frame and the ratio between the frame and the frame should be selected respectively.

[0023] The general group and closing welds are carried out in the following way: grouping processing is required first (for example, the selection ratio between plate frames and plate frames, the selection ratio between frame and frame), divided into different groups, and points are automatically distributed in each group segment according to the point distribution ratio requirements, and finally each group of welds is guaranteed to have points distributed.

[0024] S6: After the point layout is completed, the following functions are implemented on the 3D model:

[0025] Displays the weld position of the points on the 3D model (the default is the midpoint of the weld).

[0026] In the three-dimensional model, different flaw detection categories have special marking symbols.

[0027] The “detection plan length” information can be displayed, including the detection method and length information, for example: RT=600.

[0028] The weld information table is synchronized and highlighted with the 3D model.

[0029] Preview of the flaw detection summary table, including information such as weld grade, weld type, weld length, flaw detection method, flaw detection ratio, and flaw detection length.

[0030] Generate a temporary report to compare the values ​​of "calculated length" and "planned length". When the ratio is not met, a special mark is displayed.

[0031] The above-mentioned method for generating a ship structure flaw detection layout diagram based on a three-dimensional model, further, the judgment conditions of "+" and "T" welds are based on the starting and ending coordinates of each weld. If the same coordinates overlap three times, it means that the point is a "T" weld, and if there are four overlaps, it means that the point is a "+" weld.

[0032] The above-mentioned method for generating a ship structure flaw detection layout drawing based on a three-dimensional model, further, in step S3, the basic information of the weld is: weld number, assembly stage, welding method, welding type, weld leg length, part name, material, specification, and structural grade of the connecting part and the connected part.

[0033] It has a wide range of applications in the field of shipbuilding, improving the accuracy and scientificity of flaw detection layout, reducing design costs, ensuring welding quality, and making on-site inspections intuitive and clear. This method subverts the traditional flaw detection and drawing model, greatly improving the efficiency of quality inspectors in arranging flaw detection for welds and generating flaw detection drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is the model that gives the structural level description;

[0035] Figure 2 It is the generated basic information table of weld (partial);

[0036] Figure 3 Generate flaw detection diagram;

[0037] Figure 4 Generate summary reports. DETAILED DESCRIPTION

[0038] The present invention will be further described in conjunction with the accompanying drawings.

[0039] A method for generating ship structure flaw detection layout diagram based on three-dimensional model is described by taking a double bottom section of a certain type of ship as an example.

[0040] 1. Enter the structure type information in the model, such as Figure 1 The steel plate marked in the middle is given the structural type "I", and "GS1 = 'I'" is added to the corresponding data of the AM model.

[0041] 2. Extract the AM model information, extract the "'CUST_TEST_1'=I" information in the corresponding part output file, and feed it back to the software to obtain the structural type of the part as "I".

[0042] 3. Input the corresponding logical relationship between weld grade and structure type

[0043] 3.1 Butt & fillet joints are fully welded, as shown in Table 1

[0044]

[0045]

[0046] Table 13.2 Fillet half penetration & normal fillet welds, as shown in Table 2

[0047]

[0048] Table 2

[0049] 4. Generate basic weld information based on the topological relationship between segmented models, where the white lines in the 3D model are the generated welds, and generate weld grades based on the corresponding logical relationship between weld grades and structural types. The table content is the generated weld basic information table (partial). Figure 2 shown.

[0050] 5. Parameterize the flaw detection method, flaw detection reference length, flaw detection ratio and weld reference length, as shown in Table 3 and Table 4.

[0051]

[0052] Table 3

[0053]

[0054]

[0055] Table 4

[0056] 6. Carry out point distribution calculation.

[0057] According to the configured layout logic, the layout calculation starts and the final layout information is obtained. After the check is completed and the chart file is generated, the layout is completed.

[0058] The generated flaw detection table (partial) is shown in Table 5.

[0059] Serial number Ship number Weld No. Weld grade Notes Design Correction MT UT RT 1 FPSO-10 2206-003-01 Ⅲ 600 2 FPSO-10 2206-003-02 Ⅲ 600 3 FPSO-10 2206-003-03 Ⅲ 600 4 FPSO-10 2206-003-04 Ⅲ 600 5 FPSO-10 2206-003-05 Ⅲ 600 6 FPSO-10 2206-003-06 Ⅲ 600 7 FPSO-10 2206-003-07 Ⅲ 600 8 FPSO-10 2206-003-08 Ⅲ 500 9 FPSO-10 2206-003-09 Ⅲ 600 10 FPSO-10 2206-003-10 Ⅲ 600 11 FPSO-10 2206-003-11 Ⅲ 500 12 FPSO-10 2206-003-12 Ⅲ 600

[0060] Table 5

[0061] Generate flaw detection images such as Figure 3 As shown, generate a summary report such as Figure 4 shown.

Claims

1. A method for generating a ship structure flaw detection arrangement diagram based on a three-dimensional model, characterized in that: S1: According to the content of the Gen file in the AM model, add the hull structure type information to the Hull Design module of the AVEVA Marine platform. The structure types are divided into three types: special structure I, main structure II, and secondary structure III; S2: According to the structural type information, the structural type is divided into three levels, namely Class I, Class II and Class III. Each level corresponds to different weld types. The weld types corresponding to Class I are, among all welds, butt & fillet full penetration or fillet half penetration & ordinary fillet welds; the weld types corresponding to Class II are, among all welds except Class I, butt & fillet full penetration or fillet half penetration & ordinary fillet welds; the weld types corresponding to Class III are, among all welds except Class I and Class II, butt & fillet full penetration or fillet half penetration & ordinary fillet welds; S3: According to the classification of the AM model structure types and combined with the information of the AM model itself, the basic information of the weld is output, the basic information is obtained based on the AM model, and the weld sequence number, weld grade, and weld connection form are established according to the connection relationship between the models; S4: Parameterize the flaw detection method, flaw detection reference length, flaw detection ratio and weld reference length. (1) The flaw detection method and the flaw detection reference length configuration are: Detection method RT, detection reference length, 1 point = 300mm, shortest point length = 50mm; Detection method UT, detection reference length, 1 point = 500mm, shortest point length = 150mm; Flaw detection method MT, flaw detection reference length, 1 point = 500mm, shortest point length = 75mm; (2) The flaw detection ratio configuration is: S5: Achieve efficient layout of weld flaw detection layout, (1) First define the applicable conditions of the flaw detection method. If the weld type is a butt weld, the thickness of the connector or the connected part, whichever is smaller, is greater than or equal to 40.0 mm, the flaw detection method RT does not require point distribution. If the thickness of the connector or the connected part, whichever is smaller, is less than 8.0 mm, the flaw detection method UT does not require point distribution. (2) The efficient detection points are classified into two categories: one is the welds within the segment, and the other is the overall group and the joint welds; The welding seams in sections are carried out as follows: aFor "parametric configuration", the flaw detection ratio and flaw detection method of Class I, Class II or Class III, the "+" and "T" weld intersection points are arranged first; for each arranged point, it is judged whether the length of the point meets the flaw detection ratio value, and the point arrangement is completed if it meets the ratio value; b. For the "parametric configuration", the flaw detection ratio and flaw detection method of Class I, Class II or Class III, the points are arranged from high to low weld length until the reference length is reached. One round of arrangement is completed, and the second and third rounds are arranged again according to the same rules. For each arranged point, it is judged whether the length of the arranged point meets the flaw detection ratio value. If it meets the value, the point arrangement is completed. c. Prioritize the flaw detection methods: arrange in the order of RT, UT, and MT. RT and UT should not be arranged on the same weld at the same time, except for the 100% distribution ratio; MT distribution weld is equal to RT distribution weld plus UT distribution weld; d. Before arranging the reference length, preliminarily determine the reference length value according to the order of weld length; When the flaw detection ratio is low, that is, fewer welds need to be distributed, it is difficult to meet the general needs and the flaw detection ratio should be evenly distributed. For the total group and the closing seam, the ratio between the plate frame and the plate frame and the ratio between the frame and the frame should be selected respectively; The general group and closing welds are carried out in the following way: first, group processing is required, and points are automatically arranged in each group segment according to the point distribution ratio requirements, so as to ensure that each group of welds has points; S6: After the point layout is completed, the following functions are implemented on the 3D model: The weld position of the points is displayed on the 3D model, and the default position is the midpoint of the weld; In the 3D model, different flaw detection categories are marked with special symbols; The "detection plan length" information can be displayed, including the detection method and length information, for example: RT=600; Matching synchronization and highlighting of weld information table and 3D model; Preview of the flaw detection summary table, including: weld grade, weld type, weld length, flaw detection method, flaw detection ratio, flaw detection length, etc. Generate a temporary report to compare the values ​​of "Calculated Length" and "Planned Length". When the ratio is not met, a special mark is displayed.

2. The method for generating a ship structure flaw detection arrangement drawing based on a three-dimensional model according to claim 1, characterized in that: The judgment criteria for "+" and "T" welds are based on the starting and ending coordinates of each weld. If the same coordinates overlap three times, it means that the point is a "T" weld. If there are four overlaps, it means that the point is a "+" weld.

3. The method for generating a ship structure flaw detection arrangement diagram based on a three-dimensional model according to claim 1, characterized in that: In step S3, the basic information of the weld is: weld number, assembly stage, welding method, welding type, weld leg length, part name, material, specification, and structural grade of the connecting part and the connected part.

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