CN113071628B - Lofting method for stern section molded line containing shaft packing plate - Google Patents
Lofting method for stern section molded line containing shaft packing plate Download PDFInfo
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- CN113071628B CN113071628B CN202110445443.1A CN202110445443A CN113071628B CN 113071628 B CN113071628 B CN 113071628B CN 202110445443 A CN202110445443 A CN 202110445443A CN 113071628 B CN113071628 B CN 113071628B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B73/00—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms
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Abstract
The invention relates to the technical field of setting-out fairing of hull molded lines, and discloses a setting-out method of a stern molded line containing a shaft wrapping plate. The lofting method of the stern section molded line containing the shaft clad plate reduces the difficulty of lofting work while ensuring lofting precision, improves the lofting work efficiency and provides basic conditions for subsequent lofting and modeling work of the shaft clad plate.
Description
Technical Field
The invention relates to the technical field of ship profile lofting fairing, in particular to a lofting method of a stern profile containing a shaft wrapper sheet.
Background
The hull profile is a theoretical hull curve obtained by an upstream design unit according to a mother ship and a ship model pool experimental design, the profile obtained at the stage aims at meeting the requirement of overall performance calculation, and therefore a local unsmooth area exists, if the hull is built according to the profile, the hull is unsmooth and unattractive, and the underwater part navigation resistance is increased. Therefore, before ship design and construction in a shipyard, the first step is to perform three-way fairing processing on hull profiles provided by a design institute to obtain fairing profile diagrams and profile data, which are respectively used for subsequent hull structure lofting and structural design modeling work.
The shaft wrapper sheet is positioned in the area where the stern shaft penetrates through the hull outer plate and protrudes out of the hull outer plate, and is used for keeping the stern shaft area watertight, maintaining the molded line smooth and reducing the resistance, and the transverse appearance of the shaft wrapper sheet is mostly composed of a section of a positive arc area and two sections of transition curve areas connected with the hull outer plate. The conventional stern molded lines have small curvature and smooth curve change transition, while the molded lines in the shaft wrapper plate area have large curvature and rapid curve change, and if the shaft wrapper plate molded lines and the stern molded lines are taken as a whole to simultaneously perform three-way fairing lofting, the workload of the molded line lofting can be increased, and meanwhile, the molded lines in the shaft wrapper plate area can interfere with the normal trend of the stern molded lines, so that the stern molded lines cannot reach the satisfactory fairing effect.
Disclosure of Invention
The purpose of the invention is: the lofting method of the stern section molded lines with the shaft wrapping plates is provided, lofting accuracy is guaranteed, meanwhile, the difficulty of lofting work is reduced, lofting work efficiency is improved, and the molded lines after lofting can meet requirements of lofting of outer plates of the shaft wrapping plates and modeling of the shaft wrapping plate area structure.
In order to solve the technical problem, the invention provides a lofting method of a stern section line containing a shaft wrapper sheet.
A lofting method of a stern section line containing a shaft wrapper sheet comprises the following steps:
firstly, according to an original hull molded line, lofting and fairing a stern molded line to obtain a stern lofted molded line, defining a rib number interpolation and generating a stern rib molded line graph, a stern water line graph and a stern longitudinal section line graph;
secondly, correspondingly placing the original theoretical shaft wrapper sheet molded lines into the stern rib molded line diagram generated in the first step;
thirdly, making a vertical auxiliary line of the shaft clad plate molded line, and solving the height and width coordinates of the projection point of the shaft clad plate and the hull outer plate transition vanishing point in the stern rib line graph;
fourthly, according to the height and width coordinates obtained in the third step, the length coordinates of the shaft wrapping plate and the transition vanishing point of the hull outer plate in the hull coordinates are obtained through a three-view projection relation in the stern lofting molded line;
fifthly, performing three-way fairing on the vertical auxiliary line of the shaft-clad plate molded line in the third step, and obtaining the radius of the circular arc section of the rib line of the shaft-clad plate at each rib position;
drawing a circle by taking the projection point of the center line of the stern shaft as the center of the circle in the stern rib line graph and the radius of the arc section of the rib line of the shaft wrapping plate obtained in the fifth step, and sequentially drawing the arc section of the rib line of each shaft wrapping plate;
seventhly, adjusting and determining the tangent point position of the transition region curve of the shaft-wrapped plate and the circular arc section of the shaft-wrapped plate, drawing an inner tangent point line of the transition curve of the rib line of the shaft-wrapped plate and the circular arc section of the shaft-wrapped plate, and performing three-way fairing on the inner tangent point line;
eighthly, adjusting and determining the tangent point position of the transition region curve of the shaft cladding plate and the stern rib profile line, drawing an external tangent point line tangent to the transition curve of the shaft cladding plate rib profile line and the stern rib profile line, and performing three-way fairing on the external tangent point line;
grid lines with proper intervals are encrypted in a shaft wrapping plate area in a stern rib line graph, and three-way fairing is carried out on a shaft wrapping plate transition profile to finish shaft wrapping plate profile fairing and obtain a shaft wrapping plate lofting profile;
and tenthly, carrying out graphic arrangement and splicing treatment on the smooth shaft clad plate lofting molded line and the stern lofting molded line to obtain a complete stern molded line containing the shaft clad plate.
As a preferred scheme of the invention, in the first step, lofting fairing is performed on the stern section line according to a conventional three-way fairing method of the hull section line, and the model point three-way adjustment is performed on the area which is not fairing until the stern section line is completely fairing.
As a preferred embodiment of the present invention, in the second step, when the original theoretical shaft wrapper sheet profile is correspondingly placed into the stern rib profile generated in the first step, a coordinate of a uniform base point is determined, so as to ensure that the positions of the shaft wrapper sheet profile and the stern profile in the hull coordinate are consistent.
As a preferred embodiment of the present invention, in the third step, the coordinate of the projection point of the centerline of the stern shaft in the stern rib profile is used as a base point, the vertical auxiliary line of the shaft wrapper plate profile is perpendicular to the adjacent rib line at the transition vanishing position of the shaft wrapper plate and the hull outer plate, and the intersection point of the vertical auxiliary line of the shaft wrapper plate profile and the maximum radius arc section of the shaft wrapper plate is the projection point of the transition vanishing point of the shaft wrapper plate and the hull outer plate in the stern rib profile, i.e. the height and width coordinates of the projection point are obtained.
As a preferred embodiment of the present invention, in the fourth step, a longitudinal section line with a corresponding width is newly defined by adding the width coordinate value of the projection point obtained in the third step, and then an intersection point is obtained by using the height value of the baseline offset projection point in the longitudinal section line graph and the longitudinal section line, and the length value of the intersection point on the hull coordinate is the length coordinate of the transition vanishing point of the axle cladding plate and the hull outer plate.
As a preferred scheme of the invention, in the fifth step, a stern rib line of the shaft wrapper plate is composed of a stern main hull rib line, an arc section of the shaft wrapper plate protruding out of the hull rib line, and a curve in which two sides of the arc section of the shaft wrapper plate are connected and transited with the stern main hull rib line, and each shaft wrapper plate rib line arc section is an arc drawn by taking a stern shaft central line projection base point as a circle center; and projecting the vertical auxiliary line of the shaft wrapper plate molded line in the stern rib molded line into a stern water line graph and a stern longitudinal sectional line graph respectively, obtaining two curves in the stern water line graph and the stern longitudinal sectional line graph, fairing the curves by adjusting coordinates of intersection points of the curves and rib positions, finishing three-way fairing of the vertical auxiliary line of the shaft wrapper plate molded line when the roundness rate of each intersection point on the two curves changes and the intersection point connecting line of the vertical auxiliary line of the shaft wrapper plate molded line and each rib position number in the stern rib molded line graph is a straight line, obtaining the intersection point of each rib line of the shaft wrapper plate on the vertical auxiliary line of the shaft wrapper plate molded line in the stern rib molded line graph, wherein the projection base point of each intersection point from the central line of the shaft is the radius value of the circular arc section of the corresponding rib position.
As a preferred embodiment of the present invention, in the seventh step, a tangent point where a transition curve of a rib line of each grade of the shaft cladding plate is tangent to a circular arc segment of the shaft cladding plate is connected by a spline curve, that is, an inscribed point line, a single curve rough fairing is performed on the inscribed point line in the rib profile chart by adjusting the position of the tangent point on the circular arc segment, the rough straightened inscribed point line is respectively projected into a stern longitudinal profile chart and a stern water line chart, and then three-way fairing is performed on the inscribed point line in the stern rib profile chart, the stern longitudinal profile chart and the stern water line chart, so as to obtain a fine straightened inscribed point line.
As a preferred embodiment of the present invention, in the step eight, a spline curve is used to connect a tangent point where a transition curve of a rib line of each grade of the shaft cladding plate is tangent to a stern rib line, that is, a circumscribed point line, a single curve rough fairing is performed on a middle tangent point line of a stern rib line graph by adjusting the position of the tangent point on the stern rib line, the circumscribed point lines after the rough fairing are respectively projected into a stern longitudinal line graph and a stern water line graph, and then three-way fairing is performed on the circumscribed point lines in the stern rib line graph, the stern longitudinal line graph and the stern water line graph, so as to obtain a finished circumscribed point line.
As a preferred embodiment of the present invention, in the ninth step, local grid lines with appropriate spacing are set in the height and width directions in an encrypted manner for controlling the curve trend of the shaft wrapper plate type line transition region according to the change of the curvature of the shaft wrapper plate type line in the stern rib type line graph, and the grid line spacing is positioned to be 100mm according to the curvature of the shaft wrapper plate type line transition curve; when three-way fairing is carried out on the transition line of the shaft wrapping plate, the intersection point of the grid line on the height and the line of the shaft wrapping plate is projected into a water line diagram of a stern part, the intersection point of the grid line on the width and the line of the shaft wrapping plate is projected into a longitudinal line diagram of the stern part, interactive three-way fairing is carried out on a transition curve in a rib line diagram of the stern part, a water line diagram of the stern part and a projection curve of the grid line in the longitudinal line diagram of the stern part, and when the transition curve in the rib line diagram of the stern part, the water line diagram of the stern part and the projection curve in the longitudinal line diagram of the stern part are adjusted to be in a fairing state with regularly changed curve circularities, a finish fairing curve of a shaft wrapping plate area is obtained.
In the step ten, as a preferred scheme of the invention, the integrated stern rib line, stern waterline and stern longitudinal profile are obtained after finishing and splicing.
The invention discloses a lofting method of a stern section molded line containing a shaft clad plate, which comprises the steps of individually lofting and fairing a main hull molded line of a stern section in advance, drawing a theoretical shaft clad plate molded line on the basis of a stern section rib molded line graph obtained after lofting, adding an auxiliary line and a tangent point line according to the curve characteristics of the shaft clad plate, fairing a space curve controlling the appearance characteristics of the shaft clad plate in advance, and fairing an internal rib section molded line after determining the basic outline of the shaft clad plate. The method reduces the difficulty of the lofting work while ensuring the lofting precision, improves the lofting work efficiency, and provides basic conditions for subsequent lofting and modeling work of the shaft cladding plate.
Drawings
FIG. 1 is a line drawing of a stern rib profile with a partial wrapper plate free region according to an embodiment of the present invention;
FIG. 2 is a line drawing of a stern rib profile with an original theoretical plate-over-shaft profile according to an embodiment of the present invention;
FIG. 3 is a schematic view of an auxiliary vertical line according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of determining the length of the vanishing point of the wrapper sheet according to the width and height on the longitudinal section according to the embodiment of the invention;
FIG. 5 is a schematic illustration of rib line characterization of a shaft-clad plate according to an embodiment of the present invention;
FIG. 6 is a schematic projection view of an auxiliary line and a tangent point line of a wrapper sheet in a longitudinal section according to an embodiment of the present invention;
FIG. 7 is a schematic projection diagram of an auxiliary line and a tangent point line of a wrapper sheet in a water line diagram according to an embodiment of the present invention;
FIG. 8 is a schematic view of a rib line of a shaft-cladding plate drawing a circular arc segment according to an embodiment of the present invention;
FIG. 9 is a cross-sectional view of a cross-section of a stern rib profile of a region containing a wrapper sheet after cross-sectional alignment and splicing according to an embodiment of the present invention;
in the figure, 1, the stern rib line; 2. wrapping the plate molded line by the original theoretical shaft; 21. the rib line circular arc section of the shaft wrapping plate; 22. a far-middle side transition curve of a rib line of the shaft-wrapped plate; 23. the mid-proximal transition curve of the rib line of the shaft-wrapped plate; 3. the shaft-clad plate molded line is vertical to the auxiliary line; 31. the vertical auxiliary line projects a curve on the longitudinal section line graph; 32. the vertical auxiliary line of the shaft wrapping plate molded line projects a curve on a water line graph; 4. a longitudinal section corresponding to the width value of the vanishing point of the shaft wrapping plate; 5. a mesial inscribed dotted line; 51. the mesial inscribed point line projects a curve on the longitudinal section line graph; 52. the mesial inscribed point line projects a curve on a water line graph; 6. a distal inscribed point line; 61. the far-middle side inscribed point line projects a curve on a longitudinal section line graph; 62. the far-medial side inscribed point line projects a curve on a water line graph; 7. a mesial circumscribed dot line; 71. the mesial circumscribed point line projects a curve on the longitudinal section line graph; 72. the mesial circumscribed point line projects a curve on a water line graph; 8. a distal circumscribed point line; 81. the far-middle side circumscribed point line projects a curve on the longitudinal section line graph; 82. the far medial circumscribed point line projects a curve on the water line graph.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it is to be understood that the terms "mounted," "connected," and "connected" are used broadly and are defined as, for example, either fixedly connected, detachably connected, or integrally connected, unless otherwise explicitly stated or limited; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it is to be further understood that the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the machine or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
Referring to fig. 1-9, a method for lofting a stern profile including a shaft wrapper sheet according to a preferred embodiment of the present invention includes the steps of:
firstly, according to an original hull profile, lofting and fairing a stern profile to obtain a stern lofted profile, defining rib number interpolation and generating a stern rib profile chart, a stern water line chart and a stern longitudinal profile chart, wherein the rib number in the embodiment is 26-38 #, and a stern rib profile 1 is shown in fig. 1;
secondly, correspondingly placing the original theoretical shaft wrapper sheet molded line 2 into the stern rib molded line diagram generated in the first step;
thirdly, making a shaft-clad plate molded line vertical auxiliary line 3, and solving the height and width coordinates of the projection point of the shaft-clad plate and the hull outer plate transition vanishing point in the stern rib line graph;
fourthly, according to the height and width coordinates obtained in the third step, the length coordinates of the shaft wrapping plate and the transition vanishing point of the hull outer plate in the hull coordinates are obtained through a three-view projection relation in the stern lofting molded line;
fifthly, performing three-way fairing on the vertical auxiliary line 3 of the shaft-clad plate molded line in the third step, and solving the circular radius of the circular arc section 21 of the rib line of the shaft-clad plate at each rib position;
sixthly, drawing a circle by taking the projection point of the central line of the stern shaft as the center of the circle in the stern rib line graph and the radius of the circular arc section 21 of the rib line of the shaft wrapping plate obtained in the step five, and sequentially drawing the circular arc section of the rib line of each shaft wrapping plate, as shown in the figure 8;
seventhly, adjusting and determining the tangent point position of the transition region curve of the shaft-wrapped plate and the circular arc section of the shaft-wrapped plate, drawing an inner tangent point line of the transition curve of the rib line of the shaft-wrapped plate and the circular arc section of the shaft-wrapped plate, and performing three-way fairing on the inner tangent point line;
eighthly, adjusting and determining the tangent point position of the transition region curve of the shaft cladding plate and the stern rib profile line, drawing an external tangent point line tangent to the transition curve of the shaft cladding plate rib profile line and the stern rib profile line, and performing three-way fairing on the external tangent point line;
grid lines with proper intervals are encrypted in a shaft wrapping plate area in a stern rib line graph, and three-way fairing is carried out on a shaft wrapping plate transition profile to finish shaft wrapping plate profile fairing and obtain a shaft wrapping plate lofting profile;
and tenthly, carrying out graphic arrangement and splicing treatment on the smooth shaft clad plate lofting molded line and the stern lofting molded line to obtain a complete stern molded line containing the shaft clad plate.
In the first step, lofting fairing is performed on the stern section line according to a conventional three-way fairing method for the hull section line, and the three-way adjustment of the model value is performed on the area which is not fairing until the stern section line is completely fairing.
In the second step, for example, when the original theoretical shaft wrapper sheet profile 2 is correspondingly placed in the stern rib profile map generated in the first step, the original theoretical shaft wrapper sheet profile 2 needs to be copied and pasted by determining a uniform base point coordinate, so as to ensure that the positions of the shaft wrapper sheet profile and the stern profile in the ship body coordinate are consistent, and the method uses the coordinate of the projection point of the stern shaft center line in the stern rib profile map as a base point a to copy and paste.
In the third step, for example, the coordinate of the projection point of the center line of the stern shaft in the stern rib profile is taken as a base point a, the vertical auxiliary line 3 of the shaft wrapping plate profile is perpendicular to the adjacent rib line 38# of the transition vanishing position of the shaft wrapping plate and the outer hull plate at a point B, and the intersection point C of the vertical auxiliary line 3 of the shaft wrapping plate profile and the arc section with the maximum radius of the shaft wrapping plate is the projection point of the transition vanishing point of the shaft wrapping plate and the outer hull plate in the stern rib profile, that is, the height and width coordinates of the projection point can be measured.
In the fourth step, a longitudinal section line (a longitudinal section line 4 corresponding to the width of the vanishing point of the shaft-wrapped plate) with a corresponding width is newly added and defined by the width coordinate value of the projection point obtained in the third step, and then an intersection point C 'is obtained by using the height value of the baseline offset projection point in the longitudinal section line and the longitudinal section line, wherein the length value of the intersection point C' on the hull coordinate is the length coordinate of the vanishing point of the transition of the shaft-wrapped plate and the hull outer plate, as shown in fig. 4, the specific rib position number 37.026# of the vanishing point of the transition of the hull outer plate.
Exemplarily, in the fifth step, a stern rib line of the shaft clad plate is composed of a stern main hull rib line 1, an arc section (a shaft clad plate rib line arc section 21) of the shaft clad plate protruding out of the hull rib line, and curves (a shaft clad plate rib line far-middle side transition curve 22 and a shaft clad plate rib line near-middle side transition curve 23) of which two sides are in connection transition with the stern main hull rib line, and each shaft clad plate rib line arc section 21 is an arc drawn by taking a stern shaft central line projection base point as a circle center; the wrapper plate profile vertical auxiliary line 3 of the stern section rib profile is projected into a stern section water line graph and a stern section longitudinal line graph respectively, as shown in figures 6 and 7, two curves are obtained in a stern water line graph and a stern longitudinal section line graph (a vertical auxiliary line projects a curve 31 on the longitudinal section line graph and an axial wrapping plate molded line vertical auxiliary line projects a curve 32 on the water line graph), the curves are smoothed by adjusting the intersection point coordinates of the two curves and a rib position, when the circularity rule of each intersection point on the two curves changes and the intersection point connecting line of the shaft wrapping plate molded line vertical auxiliary line 3 and each rib position number in the stern rib line graph is a straight line, the shaft wrapping plate molded line vertical auxiliary line 3 completes three-way fairing, the intersection points of all the costal lines of the shaft wrapper plate on the vertical auxiliary line 3 of the shaft wrapper plate molded line in the stern rib line chart can be obtained, and the distance between each intersection point and the projection base point of the center line of the stern shaft is the radius value of the corresponding rib position circular arc section.
In the seventh exemplary step, as shown by point F, G in fig. 5, a sample curve is used to connect the tangent point where the transition curve of the rib line of each grade of the shaft wrapper plate is tangent to the circular arc section of the shaft wrapper plate, that is, the tangent point line, the position of the tangent point on the circular arc section is adjusted, the tangent point line in the rib line graph is subjected to single curve rough fairing, the rough smooth tangent point line is projected to the longitudinal profile line of the stern part and the water line graph of the stern part respectively, and then the tangent point lines in the rib line graph, the longitudinal profile line graph of the stern part and the water line graph of the stern part are subjected to three-way fairing to obtain the fine smooth tangent point line, the tangent point line in the longitudinal profile line graph is divided into the tangent point line (the tangent point line 5 on the near side) on the two sides of the circular arc section near the ship side and the tangent point line (the tangent point line 6 on the far side) on the ship side, and the projection curve in the longitudinal profile line in the stern part corresponds to the tangent point line on the near side (the tangent point line 51 on the near side), The far-middle inscribed point line (the far-middle inscribed point line projects a curve 61 on the longitudinal section line graph), and the projected curves on the stern water line graph correspond to the near-middle inscribed point line (the near-middle inscribed point line projects a curve 52 on the water line graph) and the far-middle inscribed point line (the far-middle inscribed point line projects a curve 62 on the water line graph), which are shown in fig. 6, 7 and 9.
In an exemplary step eight, as shown by a point E, H in fig. 5, a spline curve is used to connect a tangent point where a transition curve of a rib line of each shaft cladding plate is tangent to a stern rib line, that is, a circumscribed point line, a single curve rough fairing is performed on a middle tangent point line of a stern rib line graph by adjusting the position of the tangent point on the stern rib line, the circumscribed point lines after the rough fairing are respectively projected into a stern longitudinal line graph and a stern water line graph, and then three-way fairing is performed on the circumscribed point lines in the stern rib line graph, the stern longitudinal line graph and the stern water line graph to obtain a circumscribed point line after the fine fairing; the circumscribed point line is divided into a circumscribed point line (a near-middle circumscribed point line 7) on one side close to the middle of the ship and a circumscribed point line (a far-middle circumscribed point line 8) on one side far away from the middle of the ship on two sides of the shaft wrapper plate type line, the projection curves in the stern part longitudinal section diagram correspond to the circumscribed point line (the near-middle circumscribed point line projects a curve 71 on the longitudinal section diagram) and the circumscribed point line (the far-middle circumscribed point line projects a curve 81 on the longitudinal section diagram), and the projection curves in the stern part water line diagram correspond to the circumscribed point line (the near-middle circumscribed point line projects a curve 72 on the water line diagram) and the circumscribed point line (the far-middle circumscribed point line projects a curve 82 on the water line diagram), as shown in fig. 6, 7 and 9.
In the ninth step, for controlling the curve trend of the shaft wrapper plate type line transition region according to the change of the curvature of the shaft wrapper plate type line in the stern rib type line graph, local grid lines with proper intervals are arranged in the height and width directions in an encrypted mode, and the interval of the grid lines is positioned to be 100mm according to the curvature of the shaft wrapper plate transition curve; when three-way fairing is carried out on the transition line of the shaft wrapping plate, the intersection point of the grid line on the height and the line of the shaft wrapping plate is projected into a water line diagram of a stern part, the intersection point of the grid line on the width and the line of the shaft wrapping plate is projected into a longitudinal line diagram of the stern part, interactive three-way fairing is carried out on a transition curve in a rib line diagram of the stern part, a water line diagram of the stern part and a projection curve of the grid line in the longitudinal line diagram of the stern part, and when the transition curve in the rib line diagram of the stern part, the water line diagram of the stern part and the projection curve in the longitudinal line diagram of the stern part are adjusted to be in a fairing state with regularly changed curve circularities, a finish fairing curve of a shaft wrapping plate area is obtained.
In the step ten, for example, the finished and spliced stern rib profiles, stern waterline and stern longitudinal profiles are obtained, fig. 9 shows the finished and spliced stern rib profiles, and other bidirectional profiles can be obtained similarly.
The invention discloses a lofting method of a stern section molded line containing a shaft clad plate, which comprises the steps of individually lofting and fairing a main hull molded line of a stern section in advance, drawing a theoretical shaft clad plate molded line on the basis of a stern section rib molded line graph obtained after lofting, adding an auxiliary line and a tangent point line according to the curve characteristics of the shaft clad plate, fairing a space curve controlling the appearance characteristics of the shaft clad plate in advance, and fairing an internal rib section molded line after determining the basic outline of the shaft clad plate. The method reduces the difficulty of the lofting work while ensuring the lofting precision, improves the lofting work efficiency, and provides basic conditions for subsequent lofting and modeling work of the shaft cladding plate.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A lofting method of a stern section profile containing a shaft wrapper sheet is characterized by comprising the following steps:
firstly, according to an original hull molded line, lofting and fairing a stern molded line to obtain a stern lofted molded line, defining a rib number interpolation and generating a stern rib molded line graph, a stern water line graph and a stern longitudinal section line graph;
secondly, correspondingly placing the original theoretical shaft wrapper sheet molded lines into the stern rib molded line diagram generated in the first step;
thirdly, making a vertical auxiliary line of the shaft clad plate molded line, and solving the height and width coordinates of the projection point of the shaft clad plate and the hull outer plate transition vanishing point in the stern rib line graph;
fourthly, according to the height and width coordinates obtained in the third step, the length coordinates of the shaft wrapping plate and the transition vanishing point of the hull outer plate in the hull coordinates are obtained through a three-view projection relation in the stern lofting molded line;
fifthly, performing three-way fairing on the vertical auxiliary line of the shaft-clad plate molded line in the third step, and obtaining the radius of the circular arc section of the rib line of the shaft-clad plate at each rib position;
drawing a circle by taking the projection point of the center line of the stern shaft as the center of the circle in the stern rib line graph and the radius of the arc section of the rib line of the shaft wrapping plate obtained in the fifth step, and sequentially drawing the arc section of the rib line of each shaft wrapping plate;
seventhly, adjusting and determining the tangent point position of the transition region curve of the shaft-wrapped plate and the circular arc section of the shaft-wrapped plate, drawing an inner tangent point line of the transition curve of the rib line of the shaft-wrapped plate and the circular arc section of the shaft-wrapped plate, and performing three-way fairing on the inner tangent point line;
eighthly, adjusting and determining the tangent point position of the transition region curve of the shaft cladding plate and the stern rib profile line, drawing an external tangent point line tangent to the transition curve of the shaft cladding plate rib profile line and the stern rib profile line, and performing three-way fairing on the external tangent point line;
grid lines with proper intervals are encrypted in a shaft wrapping plate area in a stern rib line graph, and three-way fairing is carried out on a shaft wrapping plate transition profile to finish shaft wrapping plate profile fairing and obtain a shaft wrapping plate lofting profile;
and tenthly, carrying out graphic arrangement and splicing treatment on the smooth shaft clad plate lofting molded line and the stern lofting molded line to obtain a complete stern molded line containing the shaft clad plate.
2. The method of claim 1, wherein the step of lofting the stern line comprises: in the first step, lofting fairing is carried out on the stern molded lines according to a conventional three-way fairing method of hull molded lines, and model value point three-way adjustment is carried out on regions which are not fairing until all the stern molded lines are fairing.
3. The method of claim 1, wherein the step of lofting the stern line comprises: in the second step, when the original theoretical shaft wrapper sheet molded lines are correspondingly placed in the stern rib molded line graph generated in the first step, a unified base point coordinate is determined, and the position of the shaft wrapper sheet molded lines and the position of the stern molded lines in the ship body coordinate are ensured to be consistent.
4. The method of claim 1, wherein the step of lofting the stern line comprises: in the third step, the coordinate of the projection point of the central line of the stern shaft in the stern rib profile is taken as a base point, the vertical auxiliary line of the shaft clad plate profile is perpendicular to the adjacent rib line at the transition vanishing position of the shaft clad plate and the hull outer plate, and the intersection point of the vertical auxiliary line of the shaft clad plate profile and the arc section with the maximum radius of the shaft clad plate is the projection point of the transition vanishing point of the shaft clad plate and the hull outer plate in the stern rib profile, namely the height and width coordinates of the projection point can be measured.
5. The method of claim 1, wherein the step of lofting the stern line comprises: and in the fourth step, newly adding and defining a corresponding width longitudinal section by using the width coordinate value of the projection point obtained in the third step, and obtaining an intersection point by using the height value of the baseline offset projection point in the longitudinal section and the longitudinal section, wherein the length value of the intersection point on the ship body coordinate is the length coordinate of the transition vanishing point of the shaft wrapping plate and the ship body outer plate.
6. The method of claim 1, wherein the step of lofting the stern line comprises: in the fifth step, a stern rib line of the shaft cladding plate is composed of a stern main hull rib line, an arc section of the shaft cladding plate protruding out of the hull rib line, and a curve of which two sides of the arc section of the shaft cladding plate are connected and transited with the stern main hull rib line, and the arc section of the shaft cladding plate rib line of each gear is an arc drawn by taking a stern shaft central line projection base point as a circle center; and projecting the vertical auxiliary line of the shaft wrapper plate molded line in the stern rib molded line into a stern water line graph and a stern longitudinal sectional line graph respectively, obtaining two curves in the stern water line graph and the stern longitudinal sectional line graph, fairing the curves by adjusting coordinates of intersection points of the curves and rib positions, finishing three-way fairing of the vertical auxiliary line of the shaft wrapper plate molded line when the roundness rate of each intersection point on the two curves changes and the intersection point connecting line of the vertical auxiliary line of the shaft wrapper plate molded line and each rib position number in the stern rib molded line graph is a straight line, obtaining the intersection point of each rib line of the shaft wrapper plate on the vertical auxiliary line of the shaft wrapper plate molded line in the stern rib molded line graph, wherein the projection base point of each intersection point from the central line of the shaft is the radius value of the circular arc section of the corresponding rib position.
7. The method of claim 1, wherein the step of lofting the stern line comprises: and seventhly, connecting a transition curve of a rib line of each grade of shaft wrapping plate with a sample curve to form tangent points tangent to the circular arc sections of the shaft wrapping plates, namely inner tangent point lines, performing single curve rough fairing on the inner tangent point lines in a rib line graph by adjusting the positions of the tangent points on the circular arc sections, projecting the inner tangent point lines subjected to rough fairing to a stern longitudinal line graph and a stern water line graph respectively, and performing three-way fairing on the inner tangent point lines in the stern rib line graph, the stern longitudinal line graph and the stern water line graph to obtain inner tangent point lines subjected to fine fairing.
8. The method of claim 1, wherein the step of lofting the stern line comprises: in the eighth step, tangent points, namely circumscribed point lines, of a transition curve of each shaft wrapper sheet rib line tangent to a stern rib line are connected by a sample strip curve, the tangent points are single curve rough fairing is carried out on a middle tangent point line of a stern rib line graph by adjusting the positions of the tangent points on the stern rib line, the circumscribed point lines after the rough fairing are respectively projected into a stern longitudinal line graph and a stern water line graph, and then three-way fairing is carried out on the circumscribed point lines in the stern rib line graph, the stern longitudinal line graph and the stern water line graph to obtain the circumscribed point lines after the fine fairing.
9. The method of claim 1, wherein the step of lofting the stern line comprises: in the ninth step, local grid lines with proper intervals are arranged in the height direction and the width direction in an encrypted manner for controlling the curve trend of the shaft wrapper plate type line transition region according to the change of the curvature of the shaft wrapper plate type line in the tail section rib type line graph, and the interval between the grid lines is positioned to be 100mm according to the curvature of the shaft wrapper plate transition curve; when three-way fairing is carried out on the transition line of the shaft wrapping plate, the intersection point of the grid line on the height and the line of the shaft wrapping plate is projected into a water line diagram of a stern part, the intersection point of the grid line on the width and the line of the shaft wrapping plate is projected into a longitudinal line diagram of the stern part, interactive three-way fairing is carried out on a transition curve in a rib line diagram of the stern part, a water line diagram of the stern part and a projection curve of the grid line in the longitudinal line diagram of the stern part, and when the transition curve in the rib line diagram of the stern part, the water line diagram of the stern part and the projection curve in the longitudinal line diagram of the stern part are adjusted to be in a fairing state with regularly changed curve circularities, a finish fairing curve of a shaft wrapping plate area is obtained.
10. The method of claim 1, wherein the step of lofting the stern line comprises: and step ten, finishing and splicing to obtain a complete stern rib line, a stern waterline and a stern longitudinal line.
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| CN115009469B (en) * | 2022-06-30 | 2023-06-23 | 中船黄埔文冲船舶有限公司 | Lofting design method for processing template |
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| CN101407246B (en) * | 2008-11-14 | 2012-07-04 | 大连船舶重工集团有限公司 | Method for fairing and mounting shipping anchor lug and hawse pipe |
| CN105151223B (en) * | 2015-09-24 | 2017-05-31 | 中船黄埔文冲船舶有限公司 | Transition fairing of line method |
| CN105539724B (en) * | 2015-12-23 | 2017-07-04 | 江苏现代造船技术有限公司 | A kind of preparation method of ship hull surface segmentation |
| CN107292008A (en) * | 2017-06-09 | 2017-10-24 | 中船黄埔文冲船舶有限公司 | A kind of drawing anchor testing method for simulating real ship anchor recess |
| KR102119692B1 (en) * | 2018-08-21 | 2020-06-05 | 박성재 | 3D hull bending template production system based on FDM |
| CN109131739B (en) * | 2018-09-30 | 2020-04-14 | 中船黄埔文冲船舶有限公司 | Lofting method for stern section line with flow channel |
| CN109263798B (en) * | 2018-10-25 | 2020-07-03 | 中船黄埔文冲船舶有限公司 | Method for lofting hull line of stern column asymmetric ship |
| CN109284577B (en) * | 2018-10-29 | 2022-12-30 | 中船黄埔文冲船舶有限公司 | Hull profile full-scale lofting revolution mathematical lofting method |
| CN110789682B (en) * | 2019-11-14 | 2021-02-19 | 武昌船舶重工集团有限公司 | Method for positioning central line of propulsion shaft system |
| CN112124517B (en) * | 2020-09-29 | 2022-07-05 | 中船黄埔文冲船舶有限公司 | Bottom jig frame lofting method for shaft-containing wrapping plate |
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Application publication date: 20210706 Assignee: GUANGZHOU WENCHONG SHIPYARD Co.,Ltd. Assignor: CSSC HUANGPU WENCHONG SHIPBUILDING Co.,Ltd. Contract record no.: X2023440000001 Denomination of invention: A lofting method of stern profile with shaft cladding plate Granted publication date: 20220315 License type: Common License Record date: 20230109 |