CN107301279B - Three-dimensional modeling method for ship body dome - Google Patents
Three-dimensional modeling method for ship body dome Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention discloses a three-dimensional modeling method of a ship body dome, which comprises the steps of establishing a two-dimensional model cross section and a top view of the dome according to design requirements of the dome; adjusting a top view of the two-dimensional model of the air guide sleeve, and establishing a vertical projection view of the air guide sleeve; dividing the vertical projection graph of the dome into a plurality of annular equally-divided parts, positioning the equally-divided vertical projection graph in a ship model, and generating a positioning graph of a two-dimensional model of the dome; bending the two-dimensional model of the air guide sleeve to generate a top view of the three-dimensional model of the air guide sleeve; determining the intersection point of the air guide sleeve and the outer plate according to the top view of the air guide sleeve three-dimensional model; and respectively and correspondingly connecting the intersection point of the outer plate and the equal division point of the lower opening of the guide cover to generate a three-dimensional model of the guide cover. The invention can smooth the line shape of the air guide sleeve by adjusting the model, directly measure the data required by part lofting from the model, cut the sample plate sample box required by part processing, provide accurate data for assembly construction, and has the advantages of simple and convenient operation, high reliability, good universality, reduced production cost and improved working efficiency.
Description
Technical Field
The invention relates to the field of hull structure modeling, in particular to a three-dimensional modeling method of a hull dome.
Background
The tail end of the hull of the existing ship is provided with a rudder plate, a propeller frame is arranged in front of the rudder plate, and a propeller is arranged on a shaft between the propeller frame and the rudder plate. However, the tail end of the hull of the ship is the place where the water flow is most complex, the ship forward propeller rack disperses the water flow from four directions, the water flow is accelerated, and then the rotated propeller accelerates the water flow again to push the water flow backward, so that the ship obtains forward power. By arranging the air guide sleeve at the propeller frame, the four lower dispersed water flows are converged and rushed to the propeller, so that the flow speed of local water flows can be further improved, and the navigational speed of the ship can be improved.
The existing dome structure is difficult to realize structural modeling. Therefore, the dome structure can be finished only through manual lofting, and because lofting parts are often added with a lot of allowance to ensure assembly size, the manually obtained dome parts are not provided with accurate processing sample boxes, so that the part processing and forming effects are poor, and difficulties are brought to assembly construction.
In addition, the error of the manually lofted air guide sleeve part is large, and the machining basis is lacked, so that the assembly period is long, and the plate utilization rate and the working efficiency are reduced.
Disclosure of Invention
The invention provides a three-dimensional modeling method for a ship body dome, aiming at the defects of high lofting difficulty, poor processing and molding, long assembly and construction period and the like caused by incapability of realizing accurate modeling of a dome structure in the prior art.
The invention is realized by the following technical scheme:
a method of three-dimensional modeling of a hull pod, comprising:
establishing a two-dimensional model cross section and a plan view of the dome according to the design requirement of the dome;
adjusting a top view of the two-dimensional model of the air guide sleeve, and establishing a vertical projection view of the air guide sleeve;
dividing the vertical projection graph of the dome into a plurality of annular equally-divided parts, positioning the equally-divided vertical projection graph in a ship model, and generating a positioning graph of a two-dimensional model of the dome;
bending the two-dimensional model of the air guide sleeve to generate a top view of the three-dimensional model of the air guide sleeve;
determining the intersection point of the air guide sleeve and the outer plate according to the top view of the air guide sleeve three-dimensional model;
and respectively and correspondingly connecting the intersection point of the outer plate and the equal division point of the lower opening of the guide cover to generate a three-dimensional model of the guide cover.
Preferably, the method is performed on a computer on which three-dimensional modeling software is installed, the three-dimensional modeling software being CAD application software.
Preferably, the design requirements of the air guide sleeve are as follows: the axis of the air guide sleeve is perpendicular to the base plane BL of the ship body, is longitudinally located in FR149 and is 700mm away from the midship transversely.
Preferably, the pod comprises a port pod and a starboard pod, wherein the port pod lower port inner diameter is smaller than the starboard pod lower port inner diameter.
Preferably, the inner diameter of the lower port of the port guide cover is 342mm, the inner diameter of the lower port of the starboard guide cover is 630mm, and the outer diameter of the lower port of the starboard guide cover is 680mm.
Preferably, the included angles of the port air guide sleeve and the starboard air guide sleeve with the vertical direction are 30 degrees, and the included angles of the port air guide sleeve and the starboard air guide sleeve with the horizontal direction are 20 degrees.
Preferably, the port-side air guide sleeve lower opening and the starboard-side air guide sleeve lower opening are circular, and the port-side air guide sleeve upper opening and the starboard-side air guide sleeve upper opening are intersected with the outer plate respectively to form two contour lines.
Preferably, the equal fraction of the annular equal division of the vertical projection view of the air guide sleeve can be appropriately increased or decreased according to linear changes.
According to the structural characteristics and design requirements of the dome, the invention combines a ship model, and realizes the modeling of the dome structure by utilizing the three-dimensional function of CAD application software.
The invention has the following beneficial effects:
the invention provides a three-dimensional modeling method of a ship body dome, which can smooth the dome line type by adjusting a model, directly measure data required by part lofting from the model, cut sample boxes required by part processing, provide accurate data for assembly construction, and has the advantages of simple and convenient operation, high reliability, good universality, reduced production cost and improved working efficiency.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for three-dimensional modeling of a pod provided in embodiment 1 of the present invention;
FIG. 2 is a cross-sectional view of a two-dimensional model of a pod according to embodiment 1 of the present invention;
FIG. 3 is a cross-sectional view A-A of FIG. 2 provided by example 1 of the present invention;
FIG. 4 is an A-direction view of FIG. 3 provided by example 1 of the present invention;
FIG. 5 is a vertical projection view of the pod according to embodiment 1 of the present invention;
FIG. 6 is a plan view of a two-dimensional model of an annular bisecting pod provided in embodiment 1 of the present invention;
FIG. 7 is a two-dimensional model positioning chart of the pod after halving provided in embodiment 1 of the present invention;
FIG. 8 is a top view of a three-dimensional model of a pod according to embodiment 1 of the present invention;
FIG. 9 is an isometric view of a three-dimensional model of a pod according to embodiment 1 of the present invention;
fig. 10 is a three-dimensional model diagram of a pod according to embodiment 1 of the present invention.
In the figure: 1-port air guide sleeve, 11-port air guide sleeve lower opening, 2-starboard air guide sleeve, 21-starboard air guide sleeve lower opening and 3-outer plate.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
the embodiment discloses a three-dimensional modeling method of a ship body dome, which specifically comprises the following steps (fig. 1 is a flow chart of the whole modeling method):
s1: and establishing a two-dimensional model cross section and a plan view of the air guide sleeve according to the design requirements of the air guide sleeve.
CAD application software is drawing application software embedded in a terminal such as a personal computer. CAD application software is executed on the computer terminal, and a two-dimensional model cross section and a plan view of the dome are established according to design requirements of the dome.
Referring to fig. 2, fig. 2 is a cross-sectional view of a two-dimensional model of a pod. As can be seen from fig. 2, the cross section of the pod is semicircular, the axis of the pod is perpendicular to the hull base plane BL, the axis of the pod is located in FR149, the distance between the two is 700mm, and the pod is divided into a port pod 1 and a starboard pod 2, which are one each. Preferably, the inner diameter of the port air guide sleeve lower opening 11 is 342mm, the inner diameter of the starboard air guide sleeve lower opening 21 is 630mm, and the included angles of the port air guide sleeve 1 and the starboard air guide sleeve 2 and the vertical direction are 30 degrees.
Referring to fig. 3 and 4, fig. 3 is a cross-sectional view A-A of fig. 2, and fig. 4 is a view of fig. 3 from a direction, that is, a plan view of a two-dimensional model of the pod. As can be seen from fig. 3 and 4, the port pod 1 and the starboard pod 2 are connected to the outer plate 3, respectively, the angles between the port pod 1 and the starboard pod 2 and the horizontal direction are 20 °, the starboard pod lower opening 21 is circular, and the outer diameter of the starboard pod lower opening 21 is 680mm.
S2: and (5) adjusting a top view of the two-dimensional model of the air guide sleeve, and establishing a vertical projection view of the air guide sleeve.
Referring to fig. 5, fig. 5 is a vertical projection view of a pod, and the vertical projection view of the pod is initially established according to a plan view of a two-dimensional model of the pod required to be adjusted according to fig. 2. As can be seen from fig. 5, the port pod lower port 11 and the starboard pod lower port 21 are all right circles, and the port pod upper port and the starboard pod upper port intersect with the outer plate to form two contour lines.
S3: the annular ring 24 of the vertical projection view of the air guide sleeve is equally divided.
As shown in fig. 6, the annular shape 24 of the vertical projection of the dome is equally divided, the equal fraction can be appropriately increased or decreased according to the linear change, and the more the equal fraction is, the more accurate the equal fraction is.
S4: and positioning the bisected vertical projection map in a ship model to generate a positioning map of the two-dimensional model of the dome.
As shown in fig. 7, the relevant part is extracted from the hull model and the top view of the aliquot is positioned in the hull model according to the design requirements. In order to improve the positioning accuracy in the hull model, the port pod extracts the outer plate model between FR148 to FR150, and the starboard pod extracts the outer plate model between FR147 to FR 151.
S5: bending the two-dimensional model of the air guide sleeve to generate a top view of the three-dimensional model of the air guide sleeve.
As shown in fig. 8, the two-dimensional model of the pod is folded into a three-dimensional model for display in CAD application software.
S6: and determining the intersection point of the air guide sleeve and the outer plate according to the top view of the air guide sleeve three-dimensional model.
As shown in fig. 9, from the top view of the three-dimensional model of the pod displayed in the CAD application, the intersection points of the port pod 1, starboard pod 2 and outer plate 3 may be determined.
S7: and respectively and correspondingly connecting the intersection point of the outer plate and the equal division point of the lower opening of the guide cover to generate a three-dimensional model of the guide cover.
As shown in fig. 10, the equal dividing points in the plan view are projected on the outer panel 3, and are connected to the equal dividing points of the port cover lower opening 11 and the starboard cover lower opening 21, thereby forming a cover three-dimensional model.
In the prior art, the dome structure can only be finished through manual lofting, and because lofting parts are often added with a lot of allowance to ensure assembly size, the manually obtained dome parts have no accurate processing sample box, so that the part processing and forming effect is poor, and difficulty is brought to assembly construction. In addition, the error of the manually lofted air guide sleeve part is large, and the machining basis is lacked, so that the assembly period is long, and the plate utilization rate and the working efficiency are reduced.
According to the invention, the dome structure is combined with the ship model, so that the dome can be linearly adjusted in the three-dimensional model, and the fairing requirement is met. The data required by the part lofting can be directly measured from the model by the subsequent part lofting, processing, manufacturing, scribing and assembling, and the sample plate sample box required by the part processing is cut, so that accurate data is provided for assembly construction. The method is simple and convenient to operate, high in reliability and good in universality, and can reduce production cost and improve working efficiency.
Example 2:
the three-dimensional modeling method of the hull pod provided in the embodiment is different from embodiment 1 in that: the annular ring 36 of the vertical projection of the pod is equally divided, and the remaining steps are the same as those of embodiment 1, and will not be described again here.
Compared with embodiment 1, this embodiment can further improve the location accuracy that the vertical projection drawing location after the halving was in the hull model, reduces follow-up part lofting expansion, and the processing preparation, the error of data is got from the centre of the marking assembly, makes the sample case of processing that the kuppe part can be accurate, improves part machine-shaping effect, brings the facility for assembly construction.
Example 3:
the three-dimensional modeling method of the hull pod provided in the embodiment is different from embodiment 1 in that: the annular shape 48 of the vertical projection of the pod is equally divided, and the remaining steps are the same as those of embodiment 1, and will not be described again here.
Compared with the embodiment 1 and the embodiment 2, the embodiment can further improve the positioning accuracy of the equally divided vertical projection graph in the ship model, reduce the lofting and unfolding of subsequent parts, process and manufacture, and line drawing and assembling take the error of data from the center, so that the dome part can be accurately processed into a sample box, the part processing and forming effect is improved, and convenience is brought to assembly and construction.
The steps in the technical scheme of the invention can be realized through a computer terminal. The computer terminal includes a processor and a memory. The memory is used for storing program instructions in the invention, and the processor realizes corresponding functions of the invention by running the program instructions stored in the memory.
The invention provides a thought of a three-dimensional modeling method of a ship body dome, and a method and a way for realizing the technical scheme are numerous, the above description is only a preferred embodiment of the invention, and it should be noted that, for a person skilled in the art, a plurality of improvements and modifications can be made without departing from the principle of the invention, and the improvements and modifications should also be regarded as the protection scope of the invention. The components not explicitly described in this embodiment can be implemented by using the prior art.
Claims (7)
1. A method of three-dimensional modeling of a hull pod, comprising:
according to the design requirements of the air guide sleeve, a two-dimensional model cross section and a plan view of the air guide sleeve are established, wherein the design requirements of the air guide sleeve are as follows: the axis of the air guide sleeve is vertical to the base plane BL of the ship body, is longitudinally positioned in FR149 and is 700mm away from the midship transversely;
adjusting a top view of the two-dimensional model of the air guide sleeve, and establishing a vertical projection view of the air guide sleeve;
dividing the vertical projection graph of the dome into a plurality of annular equally-divided parts, positioning the equally-divided vertical projection graph in a ship model, and generating a positioning graph of a two-dimensional model of the dome;
bending a two-dimensional model of the air guide sleeve, which is established according to the design requirement of the air guide sleeve, to generate a top view of the three-dimensional model of the air guide sleeve;
determining the intersection point of the air guide sleeve and the outer plate according to the top view of the air guide sleeve three-dimensional model;
and respectively and correspondingly connecting the intersection point of the outer plate and the equal division point of the lower opening of the guide cover to generate a three-dimensional model of the guide cover.
2. The method of three-dimensional modeling of a hull pod according to claim 1, wherein the method is performed on a computer having three-dimensional modeling software installed, the three-dimensional modeling software being CAD application software.
3. The method of three-dimensional modeling of a hull pod according to claim 1, wherein the pod comprises a port pod and a starboard pod, the port pod lower port inner diameter being smaller than the starboard pod lower port inner diameter.
4. A method of three-dimensional modeling of a hull pod according to claim 3, wherein the port pod lower port inner diameter is 342mm, the starboard pod lower port inner diameter is 630mm, and the starboard pod lower port outer diameter is 680mm.
5. The method of three-dimensional modeling of a hull pod according to claim 3 or 4, wherein the angles between the port pod and the starboard pod are both 30 ° and the angles between the port pod and the starboard pod are both 20 ° and the angles between the port pod and the starboard pod are both horizontal.
6. A method of three-dimensional modeling of a hull pod according to claim 3, wherein the port pod lower port and the starboard pod lower port are both circular, and the port pod upper port and the starboard pod upper port intersect with the outer plate to form two contour lines, respectively.
7. The method of three-dimensional modeling of a hull pod according to claim 1, wherein the equal fraction of the annular bisection of the pod vertical projection is suitably increased or decreased according to a linear variation.
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| CN108765552B (en) * | 2018-05-17 | 2022-05-10 | 中船黄埔文冲船舶有限公司 | Unfolding method of runner transition plate |
| 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 |
| CN110254620B (en) * | 2019-06-28 | 2021-12-28 | 中船黄埔文冲船舶有限公司 | Manufacturing method of side-push grating |
| CN110884626B (en) * | 2019-11-15 | 2021-12-21 | 沪东中华造船(集团)有限公司 | Design method of integrated mounting base of navigation equipment underwater sensor |
| CN111498049B (en) * | 2020-04-10 | 2021-12-21 | 中船澄西扬州船舶有限公司 | Mounting method of energy-saving stator |
| CN111805813A (en) * | 2020-06-12 | 2020-10-23 | 陕西飞机工业（集团）有限公司 | Modeling processing method of high-temperature forming male die |
| CN112132621A (en) * | 2020-09-25 | 2020-12-25 | 广船国际有限公司 | Manufacturing cost determination method, manufacturing cost determination device, electronic equipment and storage medium |
| CN113148054B (en) * | 2021-04-26 | 2022-09-02 | 中船黄埔文冲船舶有限公司 | Modeling and lofting method of ship air guide sleeve |
| CN114004014A (en) * | 2021-10-19 | 2022-02-01 | 中船重工奥蓝托无锡软件技术有限公司 | Hull curved surface automatic modeling system based on NURBS |
| CN115556898A (en) * | 2022-10-25 | 2023-01-03 | 沪东中华造船(集团)有限公司 | Rapid carrying and linear control method for titanium alloy air guide sleeve for shipbuilding on inclined slipway |
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| JP3208285B2 (en) * | 1995-05-17 | 2001-09-10 | 三洋電機株式会社 | 3D assembly data generator for piping design |
| JP2006092143A (en) * | 2004-09-22 | 2006-04-06 | Nsk Ltd | Automatic drawing generation system |
| CN105893706B (en) * | 2016-04-27 | 2019-06-04 | 中船黄埔文冲船舶有限公司 | A kind of three-dimensional lofting method of fairlead steel-casting |
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Application publication date: 20171027 Assignee: Zhanjiang Nanhai Shipbuilding High tech Service Co.,Ltd. Assignor: CSSC HUANGPU WENCHONG SHIPBUILDING Co.,Ltd. Contract record no.: X2023980048822 Denomination of invention: A 3D modeling method for ship fairings Granted publication date: 20230728 License type: Common License Record date: 20231130 |
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