A method for installing a fairing for an LNG bunkering vessel's azimuth thruster.

Abstract

This invention discloses a method for installing a fairing for an LNG bunkering vessel's azimuth thruster. The method specifically includes the following steps: S1, machining the hyperboloid panels to allowance; marking allowance lines on each hyperboloid panel and cutting the panels according to these lines; S2, assembling the cut hyperboloid panels into a complete fairing; marking the three-dimensional coordinates of the connection point between the top edge of the hyperboloid panel and the outer plate on the fairing; determining a measurement coordinate system based on the hull centerline and baseline; and using a total station to determine the three-dimensional coordinates of the connection between the fairing and the outer plate on the hull body within this coordinate system; S3, installing the fairing onto the outer plate based on the determined three-dimensional coordinates, thus completing the installation. This invention ensures precise installation of the fairing by cutting the hyperboloid panels to allowance, using a total station to locate the fairing installation position, and precisely controlling the installation position using the total station's "reference surface" function.

Description

Technical Field

[0001] This invention belongs to the field of shipbuilding technology, specifically relating to a method for installing a fairing for an LNG bunkering vessel's azimuth thruster. Background Technology

[0002] In recent years, under the guidance of high-quality development and the "dual-carbon" policy, LNG, as a clean energy source, has seen rapid development in related ship products. LNG bunkering vessels have also been built in large numbers against this backdrop. However, this type of vessel has relatively small main dimensions, requires a wide range of operating routes, and its propulsion system needs to possess excellent propulsion performance, efficiency, and flexibility.

[0003] After years of technological development and updates, the azimuth thruster has become the preferred propulsion system for LNG bunkering vessels due to its superior energy-saving performance, operational performance, and maneuverability. However, due to its special structure, a hyperboloid fairing needs to be installed between the thruster and the hull hull after installation to meet fluid performance requirements.

[0004] The azimuth thruster fairing is a hyperboloid shape, which requires extremely high precision during installation. Not only must the connection position between the fairing and the hull meet the design requirements, but its plane must also maintain the specified distance and be parallel to the azimuth thruster body. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an installation method for the fairing of the LNG bunkering vessel's azimuth thruster. This invention involves cutting the hyperbolic panel to allow for a margin, using a total station to locate the fairing installation position, and using the total station's "reference surface" function to precisely control the fairing installation position, ultimately ensuring the accurate installation of the fairing.

[0006] To achieve the above-mentioned objectives, the technical solution provided by this invention patent is as follows:

[0007] A method for installing a fairing for an LNG bunkering vessel's azimuth thruster, the fairing being composed of multiple hyperbolic panels, specifically includes the following steps:

[0008] S1, Double-curved panel allowance processing: Mark the allowance lines for each double-curved panel and cut the double-curved panel according to the marked allowance lines.

[0009] S2, the hyperbolic panels after the remaining material is cut to form a complete fairing, and the three-dimensional coordinates of the top edge of the curved panel and the connection point of the outer plate on the fairing are marked; the measurement coordinate system is determined according to the hull centerline and the hull baseline, and the three-dimensional coordinates of the connection between the fairing and the outer plate on the hull are determined in the measurement coordinate system using a total station.

[0010] S3. Based on the three-dimensional coordinates determined on the fairing and the hull plate, install the fairing onto the hull plate to complete the installation of the fairing.

[0011] Furthermore, the specific steps for drawing the allowance lines on the hyperbolic panel are as follows:

[0012] S11, the bow and stern margin lines of the hyperbolic panel are drawn. Using the bow margin line as the baseline, a bow margin line parallel to the bow margin line is drawn on the hyperbolic panel. Using the stern margin line as the baseline, a stern margin line parallel to the stern margin line is drawn on the hyperbolic panel.

[0013] S12, Draw the top edge allowance line of the hyperbolic panel. Measure the distance on the hyperbolic panel between the intersection of the bow allowance line and the bottom edge line, and the intersection of the stern allowance line and the bottom edge line. Divide the measured distance into 10 equal parts and mark the division points on the bottom edge line. Measure the distance on the hyperbolic panel between the intersection of the bow allowance line and the top edge line, and the intersection of the stern allowance line and the top edge line. Divide the measured distance into 10 equal parts and mark the division points on the top edge line. Connect the division points on the top edge line with the division points on the bottom edge line to form multiple equilateral lines.

[0014] S13, draw a margin circle centered on the equidistant points of the top edge line, and connect the intersections of the margin circle and the equidistant line in sequence to obtain the margin line of the top edge line; complete the cutting of the hyperbolic panel according to the drawn margin line.

[0015] Furthermore, the distance between the bow margin line and the bow edge line is 50mm, and the distance between the stern margin line and the stern edge line is 50mm.

[0016] Furthermore, the radius of the allowance circle is 50 mm.

[0017] Furthermore, the outer side of the connection point of each hyperboloid panel in the flow guide is marked with three-dimensional coordinates at the connection point between the top edge of the hyperboloid panel and the outer plate, and the coordinates are marked according to the installation drawings.

[0018] Furthermore, the determination of the measurement coordinate system specifically involves: selecting two points on the centerline of the ship's hull on the ground, and determining the x-axis direction of the ship's coordinates by measuring the points on the centerline of the ship's hull using a total station; selecting measurement points on the baseline of the ship's hull, and determining the height of the ship's coordinates by measuring the selected measurement points using a total station; and measuring the centerline of the azimuth thruster shaft system to determine the fore and aft zero points of the ship's coordinates, thus completing the determination of the measurement coordinate system.

[0019] Furthermore, during the installation of the fairing, the three-dimensional coordinates marked on the fairing are connected to the three-dimensional coordinates marked on the hull plate, and the fairing is installed. After installation, the distance between the lower end face of the fairing and the upper end face of the azimuth thruster is measured. If the distance meets the requirements, the installation of the fairing is completed.

[0020] Furthermore, the distance between the lower end face of the fairing and the upper end face of the azimuth thruster is 20-30mm.

[0021] Based on the above technical solution, the installation method of the LNG bunkering vessel's azimuth thruster fairing, as described in this invention patent, has achieved the following technical advantages through practical application:

[0022] 1. The present invention provides a method for installing a fairing for an LNG bunkering vessel's azimuth thruster. This method involves cutting a hyperbolic panel to allow for additional material, using a total station to locate the fairing's installation position, and precisely controlling the fairing's installation position using the total station's "reference surface" function, thereby ensuring the fairing's accurate installation. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the hyperbolic panel margin line of the fairing in the installation method of the fairing of the LNG bunkering ship's azimuth thruster of the present invention.

[0024] Figure 2 This is a schematic diagram of the measurement coordinate system in the installation method of the azimuth thruster fairing of an LNG bunkering vessel according to the present invention.

[0025] Figure 3 This is a diagram showing the installation structure of the fairing in the installation method of the LNG bunkering ship's azimuth thruster fairing according to the present invention. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific examples 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 techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0027] like Figure 1-3 The present invention pertains to an installation method for a fairing of an LNG bunkering vessel's azimuth thruster. The fairing 7 is composed of multiple hyperbolic panels, and the method specifically includes the following steps:

[0028] S1, Double-curved panel allowance processing: Mark the allowance lines for each double-curved panel and cut the double-curved panel according to the marked allowance lines.

[0029] S2, the hyperbolic panel after the remaining cutting is used to form a complete fairing 7. The three-dimensional coordinates of the top edge of the curved panel and the connection point of the outer plate on the fairing 7 are marked. The measurement coordinate system is determined according to the hull centerline 5 and the hull baseline 6, and the three-dimensional coordinates of the connection between the fairing 7 and the outer plate of the hull are determined in the measurement coordinate system using a total station.

[0030] S3. Based on the three-dimensional coordinates determined on the fairing 7 and the outer plate of the hull, install the fairing 7 on the outer plate of the hull to complete the installation of the fairing 7.

[0031] The specific steps for drawing the allowance lines on the hyperbolic panel are as follows:

[0032] S11, the bow and stern margin lines of the hyperbolic panel are drawn. With the bow margin line 1 as the baseline, a bow margin line 11 parallel to the bow margin line 1 is drawn on the hyperbolic panel. With the stern margin line 2 as the baseline, a stern margin line 22 parallel to the stern margin line 2 is drawn on the hyperbolic panel.

[0033] S12, mark the top edge allowance line 44 of the hyperbolic panel. Measure the distance on the hyperbolic panel between the intersection of the bow allowance line 11 and the bottom edge line 3 and the intersection of the stern allowance line 22 and the bottom edge line 3, and divide the measured distance into 10 equal parts, marking the division points of the bottom edge line 3. Measure the distance on the hyperbolic panel between the intersection of the bow allowance line 11 and the top edge line 4 and the intersection of the stern allowance line 22 and the top edge line 4, and divide the measured distance into 10 equal parts, marking the division points of the top edge line 4. Connect the division points of the top edge line 4 and the division points of the bottom edge line 3 to form multiple equilateral lines.

[0034] S13, draw a margin circle centered on the four points of the top edge line, and connect the intersections of the margin circle and the equilateral line in sequence to obtain the top edge margin line 44; complete the cutting of the hyperbolic panel according to the drawn margin line.

[0035] The bow and stern edges are shifted 50mm towards the center to obtain the bow and stern allowance lines 22. The two allowance lines intersect the bottom edge line 3 at points P1 and P11. The middle segment of the bottom edge line 3 between P1 and P11 is divided into 10 equal parts, with each segment having an equal distance L1, L2...L10, and the intersection points being P2 to P10. The top edge line 4 is divided into equal parts in the same way, with the intersection points being P13 to P21. Connecting P1P12, P2P13...P11P22, we obtain 11 dividing lines for the curved panel. Then, an R50 circle is drawn at the vertices of the dividing lines, and the intersection points A1 to A11 with the dividing lines are the points on the top edge allowance lines. After connecting them with spline curves, the top edge allowance lines can be accurately approximated. After drawing in AutoCAD using the above method, the measured length is fed back to each curved panel. After determining the allowance of each curved panel, it is cut to obtain the theoretical part of each panel.

[0036] The distance between the bow margin line 11 and the bow edge line 1 is 50mm, and the distance between the stern margin line 22 and the stern edge line 2 is 50mm.

[0037] The radius of the allowance circle is 50 mm.

[0038] The outer side of the connection point of each hyperboloid panel in the flow guide 7 is marked with three-dimensional coordinates at the connection point between the top edge of the hyperboloid panel and the outer plate, and the coordinates are marked according to the installation drawings.

[0039] The determination of the measurement coordinate system is specifically as follows: select two points on the center line of the ship's hull on the ground, and determine the x-axis direction of the ship's coordinates by measuring the points on the center line of the ship's hull using a total station; select measurement points on the baseline of the ship's hull, and determine the height of the ship's coordinates by measuring the selected measurement points using a total station; measure the center line of the azimuth thruster shaft system to determine the fore and aft zero points of the ship's coordinates, thus completing the determination of the measurement coordinate system.

[0040] Using the "point detection" function of the total station, two points B1 and B2 on the center line 5 of the ship's hull on the ground are measured to determine the X-axis direction of the ship's coordinates. Point H on the baseline 6 of the ship's hull is measured to determine the height of the ship's coordinates. The center line of the azimuth thruster shaft system is measured to determine the zero point of the ship's coordinates at the fore and aft, so that the measurement coordinate system is consistent with the ship's coordinate system.

[0041] During installation, the three-dimensional coordinates marked on the fairing 7 are connected to the three-dimensional coordinates marked on the hull plate, and the fairing 7 is installed. After installation, the distance between the lower end face of the fairing 7 and the upper end face of the azimuth thruster is measured. If the distance meets the requirements, the installation of the fairing 7 is completed.

[0042] The distance between the lower end face of the deflector 7 and the upper end face of the azimuth thruster ranges from 20 to 30 mm. Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; 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 solution of the present invention, and all such modifications should be covered within the scope of the technical solution claimed in the present invention.

Claims

1. A method of installing a full azimuth propeller bossing of an LNG bunker vessel, the bossing being composed of a plurality of hyperbolic panels, characterized in that, The method specifically comprises the following steps: S1, excess allowance processing of the hyperboloidal panel, marking of an excess allowance line on each hyperboloidal panel, and excess allowance cutting of the hyperboloidal panel according to the marking of the excess allowance line; The marking of the excess allowance line on the hyperboloidal panel specifically comprises: S11, excess allowance line marking of the bow and stern edges of the hyperboloidal panel, marking of a bow excess allowance line parallel to the bow edge line on the hyperboloidal panel with the bow edge line as a baseline, and marking of a stern excess allowance line parallel to the stern edge line on the hyperboloidal panel with the stern edge line as a baseline; S12, excess allowance line marking of the top edge line of the hyperboloidal panel, measurement of the distance between the intersection point of the bow excess allowance line and the bottom edge line and the intersection point of the stern excess allowance line and the bottom edge line on the hyperboloidal panel, equal division of the measured distance 10, and marking of the bottom edge line division points; measurement of the distance between the intersection point of the bow excess allowance line and the top edge line and the intersection point of the stern excess allowance line and the top edge line on the hyperboloidal panel, equal division of the measured distance 10, and marking of the top edge line division points; and corresponding connection of the top edge line division points on the top edge line and the bottom edge line division points on the bottom edge line to form a plurality of equal edge lines; S13, excess allowance circle marking with the top edge line division points as the center, connection of the intersection points of the excess allowance circle and the equal edge lines to obtain the top edge line excess allowance line, and cutting of the hyperboloidal panel according to the marked excess allowance line; S2, the hyperboloidal panel after the excess allowance cutting forms a complete fairing, marking of the three-dimensional coordinates of the intersection points of the top edge line of the hyperboloidal panel and the outer plate connection points on the fairing; determination of a measurement coordinate system according to the ship body center line and the ship body baseline, and determination of the three-dimensional coordinates of the intersection points of the fairing and the ship body outer plate on the measurement coordinate system through a total station instrument; S3, installation of the fairing on the ship body outer plate according to the three-dimensional coordinates determined on the fairing and the ship body outer plate, and completion of the installation of the fairing.

2. A method of installing a full rotation propeller bossing for an LNG bunker vessel according to claim 1, characterized in that, The distance between the bow excess allowance line and the bow edge line is 50 mm, and the distance between the stern excess allowance line and the stern edge line is 50 mm.

3. The method of installing a full rotation propeller bossing of an LNG bunker vessel according to claim 1, characterized in that, The radius of the excess allowance circle is 50 mm.

4. The method of installing a turnable propeller dome of an LNG bunker vessel according to claim 1, characterized in that, The outer side of the connection of each hyperboloidal panel in the fairing is a three-dimensional coordinate marking point of the intersection point of the top edge line of the hyperboloidal panel and the outer plate connection point, and is marked according to the installation drawing coordinates.

5. A method of installing a full rotation propeller bossing for an LNG bunker vessel according to claim 4, characterized in that, The determination of the measurement coordinate system specifically comprises: selection of two points on the ground ship body center line, determination of the ship body coordinate x-axis direction through measurement of the points on the ship body center line by a total station instrument, selection of a measurement point on the ship body baseline, determination of the ship body coordinate height through measurement of the selected measurement point by the total station instrument, and determination of the ship body coordinate front and rear zero points through measurement of the full-rotation propeller shaft center line, and completion of the determination of the measurement coordinate system.

6. A method of installing a turnable propeller dome for an LNG bunker vessel according to claim 1, characterized in that, During the installation of the fairing, the three-dimensional coordinates marked on the fairing are connected with the three-dimensional coordinates marked on the ship body outer plate, the fairing is installed, the distance between the lower end surface of the fairing and the upper end surface of the full-rotation propeller is measured after the installation, and the installation of the fairing is completed when the distance meets the requirements.

7. A method of installing a full rotation propeller bossing for an LNG bunker vessel according to claim 6, characterized in that, The distance between the lower end surface of the fairing and the upper end surface of the full-rotation propeller ranges from 20 mm to 30 mm.

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