A fuel tank mounting precision control method and a fuel tank

Abstract

The application discloses a method for controlling precision of fuel tank and a fuel tank. The method comprises the following steps: setting a coordinate system, converting design coordinates of nodes, confirming sectional size data, calculating and confirming size of the fuel tank after being folded, obtaining a correction scheme of the fuel tank, forming a total section by sectional assembly, rechecking and correcting a reference line on the total assembly, simulating and analyzing butt joint of the total section, and butt joint of the total section. The application can not only meet the high-precision requirement of the MARK III type fuel tank ten-hedron for squareness, but also reduce the number of positioning monitoring, and is simple to operate, has less rework, is convenient for subsequent maintenance system packing and filling, and reduces the fuel tank construction cost and period.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and in particular to a method for controlling the accuracy of fuel tank loading and a fuel tank. Background Technology

[0002] In the modern shipping industry, dual-fuel ships powered by liquefied natural gas (LNG) are the main driving force for development. Orders for dual-fuel container ships are increasing, and efficient and precise fuel tank assembly has become a key technology in the construction of dual-fuel ships, especially for the MARK III type fuel tank. Because the MARK III type fuel tank contains only standard containers, the dimensions and shape of the fuel tank after assembly must meet high-precision design requirements. Figure 1 As shown, each section of the MARK III fuel tank has dozens of management points set during manufacturing. Traditional construction methods require adjusting the coordinates of each management point to meet the design requirements and fuel tank loading requirements. Traditional fuel tank loading methods are not only complex, difficult, and involve a lot of rework, but also make it difficult to meet the squareness control requirements of the MARK III fuel tank decahedron. This poses a significant risk to the subsequent maintenance system packing and filling, and prolongs the ship construction cycle. Summary of the Invention

[0003] In view of the deficiencies in the existing technology, this application provides a method for controlling the loading accuracy of fuel tanks, so as to solve the technical problems of high difficulty in controlling the loading accuracy of fuel tanks, high manufacturing cost and long ship construction cycle in the existing technology.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0005] A method for controlling the loading accuracy of a fuel tank, wherein the fuel tank comprises multiple segments containing three intersecting plates of a large deck, wherein the three intersecting plates refer to the intersection of any one of the plates (either the main deck plate, the inner bottom plate, or the inner shell plate) with a bulkhead plate and an inclined plate; the segments containing the three intersecting plates are defined as nodal segments; and a baseline is marked on each segment within the fuel tank; the method for controlling the loading accuracy of a fuel tank includes the following steps:

[0006] S1. Establish a coordinate system with the bow-stern direction as the X-axis, the Y-axis perpendicular to the X-axis in the horizontal plane, and the Z-axis perpendicular to the X-axis in the vertical plane. Define the intersection point of the three plates in the node segment as node 1. Calculate the design coordinates of the nodes in each node segment based on the design coordinates of the management points in the node segment in the fuel tank design drawing.

[0007] S2. Confirm the size data of each segment, which includes the length, width, and height of the segment. If the confirmed segment size differs significantly from the segment design size and exceeds the design accuracy requirements, the segment shall be corrected.

[0008] S3. Based on the data confirmed in S2, calculate and confirm the dimensions of the fuel tank after the segment assembly. The dimensions of the fuel tank include the length, width, height, and capacity of the fuel tank. Compare the calculated dimensions with the designed dimensions of the fuel tank. Based on the comparison results, derive a modification scheme for the dimensions of the fuel tank so that the modified dimensions are consistent with the designed dimensions of the fuel tank.

[0009] S4. Group all segments into different segments, and monitor each node during the grouping process. Adjust and place each node at the node design coordinates calculated in S1.

[0010] S5. Verify and correct the baselines on each section to ensure that the positional relationship between the baselines meets the design requirements, thus obtaining the corrected section.

[0011] S6. Perform a simulation analysis of the assembly and mounting of the main sections to confirm whether there is any margin in the assembly and mounting. If there is a margin, then cut the main sections.

[0012] S7. Align the main sections with the baselines and assemble them. During the assembly process, the corresponding baselines on different main sections are aligned.

[0013] In one implementation, the origin of the coordinate system described in S1 is set at hull 0.

[0014] In one implementation, in step S1, a measurement point is set on each of the three plates forming the node. The distance from each measurement point to the boundary line of the three plates can be determined by measurement. The design coordinates of each measurement point are calculated by converting the design coordinates of the inner node. In step S4, each node is adjusted and placed at the node design coordinates calculated in step S1 by adjusting the three measurement points corresponding to each node to the design coordinates of each measurement point.

[0015] In one implementation, a radiographic sheet is placed at each measurement point.

[0016] In one implementation, the baselines include bulkhead lines, hull centerlines, section centerlines, and overall section centerlines.

[0017] In one implementation, in S7, the error range of the alignment of the corresponding baseline lines is ±1mm.

[0018] In one embodiment, the fuel tank is a MARK III type fuel tank.

[0019] The present invention also provides a fuel tank, which is assembled using the above-described fuel tank assembly precision control method.

[0020] Compared with the prior art, this application has at least the following beneficial effects:

[0021] This invention calculates the design coordinates of nodes in each segment by using the design coordinates of the segmented structure management points during the fuel tank assembly process. From segment fabrication to segment assembly and assembly, the segment nodes are used as key points for positioning and monitoring. By aligning the segment node positioning with the overall assembly baseline, the high precision requirement for the squareness of the MARKⅢ type fuel tank decahedron can be achieved. This also reduces the number of positioning and monitoring points, simplifies operation, minimizes rework, facilitates subsequent system packing and filling, and reduces the fuel tank construction cost and time. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the distribution of management points in a certain section of the fuel tank structure in the prior art;

[0023] Figure 2 This is a three-dimensional schematic diagram of the node distribution inside the fuel tank in the embodiments of this application;

[0024] Figure 3 This is a schematic cross-sectional view of the node distribution inside the fuel tank in an embodiment of this application;

[0025] Figure 4 This is a schematic diagram of the baseline after review and correction in the embodiments of this application;

[0026] Figure 5 This is a schematic diagram of the assembly of the overall section baseline lines into a fuel tank in an embodiment of this application;

[0027] Figure 6 This is a schematic diagram of the distribution of measurement points within the node segments in the embodiments of this application;

[0028] Figure 7 This is a schematic diagram of the coordinate conversion of measurement points within a node segment in an embodiment of this application.

[0029] The specific explanations of the attached diagram labels are as follows: 01, Management point; 1, Node; 2, Measurement point; 3, Baseline; 301, Bulkhead line; 302, Hull centerline; 4, Deck; 5, Inner bottom plate; 6, Inner shell plate; 7, Bulkhead plate; 8, Inclined plate; Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0031] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0032] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms and should not be construed as indicating or implying relative importance. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0033] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical connection or internal connection between two components. They can be direct connection or indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0034] To better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0035] This embodiment takes the MARKⅢ type fuel tank as an example and provides a fuel tank loading accuracy control method. The fuel tank includes multiple segments with three intersecting large deck plates. The three-plate intersection refers to the intersection of any one of the plates 4, 5, or 6 with the bulkhead plate 7 and the inclined plate 8. The segments with the three-plate intersection are defined as nodal segments. A baseline is marked on each segment in the fuel tank. The fuel tank loading accuracy control method includes the following steps:

[0036] S1. Establish a coordinate system with the bow-stern direction as the X-axis, the horizontal plane perpendicular to the X-axis as the Y-axis, and the vertical plane perpendicular to the X-axis as the Z-axis. In this embodiment, the origin of the coordinate system is set at hull 0, and the intersection point of the three plates within the node segment is defined as node 1. Figure 2 , 3 As shown, the fuel tank contains a total of eight nodes 1. The design coordinates of node 1 in each node segment are calculated based on the design coordinates of the management point 01 in the node segment in the fuel tank design drawing.

[0037] S2. Confirm the dimensions of each segment. The dimensions of each segment include its length, width, and height. If the confirmed segment dimensions differ significantly from the segment design dimensions and exceed the design accuracy requirements, the segment should be corrected.

[0038] Due to various factors such as seasonal temperature and transportation, the sections may deform. The dimensions of the sections during assembly and loading may deviate significantly from the dimensions designed. If the deformation of the sections is too large, it will affect the loading accuracy of the fuel tank. In order to ensure loading accuracy, it is necessary to correct the sections with large deformations before assembly.

[0039] S3. Based on the data confirmed in S2, calculate and confirm the dimensions of the fuel tank after the segment assembly. The dimensions of the fuel tank include its length, width, height, and capacity. Compare the calculated dimensions with the design dimensions and derive a size correction scheme based on the comparison results to ensure that the corrected dimensions match the design dimensions.

[0040] For example, if the calculated length of the fuel tank is greater than the design length, the proposed modification for the tank size is to cut the segments that make up the bottom of the tank along the length direction, so that the modified tank length matches the design length. S3 prepares for subsequent tank assembly and installation.

[0041] S4. Group all segments into different segments, and monitor each node 1 during the grouping process. Adjust and place each node at the node design coordinates calculated in S1.

[0042] S5. Verify and correct the baselines on each section to ensure that the positional relationship between baselines 3 meets the design requirements, resulting in the corrected sections, such as... Figure 4 As shown.

[0043] For example, if section one and section two are assembled into section one, and the bulkhead lines of section one are not perpendicular to the hull centerline, then the bulkhead lines are redrawn on section one to make them perpendicular to the hull centerline. S5 can significantly reduce the cumulative deviations that occur from section manufacturing to section assembly.

[0044] S6. Perform a simulation analysis of the assembly and mounting of the main sections to confirm whether there is any margin in the assembly and mounting. If there is a margin, then cut the main sections.

[0045] S7. Align the main sections with the baselines during assembly. During the assembly process, the corresponding baselines on different sections are aligned line-to-line. Figure 5 As shown.

[0046] When placing and adjusting the coordinates of the adjustment points, the weld bends at the intersection of the three plates due to welding make it difficult to accurately locate the coordinates of the monitoring node. In this embodiment, in S1, to accurately locate the coordinates of the intersection of the three plates, a measuring point 2 is set on each of the three plates forming the node, such as... Figure 6 , 7 As shown, the distance from each measurement point 2 to the intersection line of the three plates can be determined by measurement. The design coordinates of each measurement point 2 can be calculated by converting the design coordinates of the inner node 1.

[0047] In step S4, by adjusting the three measurement points 2 corresponding to each node to the design coordinates of each measurement point, each node is adjusted to be placed at the node design coordinates calculated in S1.

[0048] In this embodiment, the reference lines include bulkhead line 301, hull centerline 302, section centerline, and overall section centerline. In S7, the error range for the alignment of the corresponding reference lines is ±1mm.

[0049] In this embodiment, a radiometric sheet is provided at each measurement point to facilitate the location and monitoring of the measurement point.

[0050] This embodiment also provides a fuel tank, which is mounted using the above-described fuel tank mounting accuracy control method.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A method for controlling the accuracy of fuel tank loading, characterized in that, The fuel tank comprises multiple segments with three intersecting plates on the main deck. The intersection of the three plates refers to the intersection of any one of the main deck, inner bottom plate, or inner shell plate with a bulkhead plate and an inclined plate. A segment containing these three intersecting plates is defined as a nodal segment. A baseline is marked on each segment within the fuel tank. The fuel tank loading accuracy control method includes the following steps: S1. Establish a coordinate system with the bow-stern direction as the X-axis, the horizontal plane perpendicular to the X-axis as the Y-axis, and the vertical plane perpendicular to the X-axis as the Z-axis. Define the intersection point of the three plates within the node segment as a node. Calculate the design coordinates of the nodes within each node segment based on the design coordinates of the management points within the node segment in the fuel tank design drawing. S2. Confirm the size data of each segment, which includes the length, width, and height of the segment. If the confirmed segment size differs significantly from the segment design size and exceeds the design accuracy requirements, the segment shall be corrected. S3. Based on the data confirmed in S2, calculate and confirm the dimensions of the fuel tank after the segment assembly. The dimensions of the fuel tank include the length, width, height, and capacity of the fuel tank. Compare the calculated dimensions with the designed dimensions of the fuel tank. Based on the comparison results, derive a modification scheme for the dimensions of the fuel tank so that the modified dimensions are consistent with the designed dimensions of the fuel tank. S4. Group all segments into different segments, and monitor each node during the grouping process. Adjust and place each node at the node design coordinates calculated in S1. S5. Verify and correct the baselines on each section to ensure that the positional relationship between the baselines meets the design requirements, thus obtaining the corrected section. S6. Perform a simulation analysis of the assembly and mounting of the main sections to confirm whether there is any margin in the assembly and mounting. If there is a margin, then cut the main sections. S7. Align the main sections with the baselines and assemble them. During the assembly process, the corresponding baselines on different main sections are aligned.

2. The method for controlling the accuracy of fuel tank loading according to claim 1, characterized in that, The origin of the coordinate system described in S1 is set at hull 0.

3. The method for controlling the accuracy of fuel tank loading according to claim 1, characterized in that, In step S1, a measurement point is set on each of the three plates forming the node. The distance from each measurement point to the boundary line of the three plates can be determined by measurement. The design coordinates of each measurement point are calculated by converting the design coordinates of the inner node. In step S4, each node is adjusted and placed at the node design coordinates calculated in step S1 by adjusting the three measurement points corresponding to each node to the design coordinates of each measurement point.

4. The method for controlling the accuracy of fuel tank loading according to claim 3, characterized in that, A radiograph is placed at each measurement point.

5. The method for controlling the accuracy of fuel tank loading according to claim 1, characterized in that, The baselines include bulkhead lines, hull centerlines, section centerlines, and overall section centerlines.

6. The method for controlling the accuracy of fuel tank loading according to claim 5, characterized in that, In S7, the error range for the alignment of the corresponding baseline lines is ±1mm.

7. The method for controlling the accuracy of fuel tank loading according to claim 1, characterized in that, The fuel tank is a MARK III type fuel tank.

8. A fuel tank, characterized in that, The fuel tank is mounted using the fuel tank mounting accuracy control method as described in any one of claims 1-7.

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