CN109131739B - Lofting method for stern section line with flow channel - Google Patents
Lofting method for stern section line with flow channel Download PDFInfo
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- CN109131739B CN109131739B CN201811162728.9A CN201811162728A CN109131739B CN 109131739 B CN109131739 B CN 109131739B CN 201811162728 A CN201811162728 A CN 201811162728A CN 109131739 B CN109131739 B CN 109131739B
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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
- B63B71/00—Designing vessels; Predicting their performance
- B63B71/10—Designing vessels; Predicting their performance using computer simulation, e.g. finite element method [FEM] or computational fluid dynamics [CFD]
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Abstract
The invention provides a lofting method of a stern section molded line containing a runner, which is characterized in that the lofting molded line of the runner is split and then is smoothed respectively, and the finished and spliced stern section molded line containing the runner is obtained, so that the lofting precision is ensured, the lofting difficulty is reduced, the lofting efficiency is improved, and the smooth proceeding of the subsequent design modeling work is ensured.
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 runner.
Background
According to theoretical hull curves obtained by experimental design of a mother ship and a ship model water pool, a local unsmooth area can exist before lofting is not carried out, if the hull is built according to the molded lines, the hull is unsmooth and unattractive, and the underwater part navigation resistance can be increased. Therefore, before ship design and construction, three-dimensional fairing treatment is carried out on the hull molded lines, so that subsequent hull structure lofting and structural design modeling work is facilitated.
In the field of ships, water jet propulsion is a special propulsion mode, water is sucked into a flow channel through a suction port at the bottom of a stern ship, and then reaction force of high-speed water flow is sprayed out of a jet pump at a jet port to push a ship to advance. The runner area is additionally arranged at the bottom of the stern of the ship propelled by water jet, if the stern hull line containing the runner is integrally lofted and smoothed by the traditional method, the existing ship design software cannot perform the process, if the original manual lofting is performed, the lofting work can be completed, but the workload is large, the fairing precision is low, and the manual lofting cannot generate line data for subsequent design modeling.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a lofting method of a stern section line with a flow channel, which reduces the difficulty of lofting work while ensuring lofting precision, improves lofting work efficiency and ensures smooth proceeding of subsequent design modeling work.
Based on the above, the invention provides a lofting method of a stern section line with a flow channel, which comprises the following steps:
the method comprises the following steps: according to the original hull molded line, carrying out lofting fairing on the stern molded line and obtaining a stern lofting molded line;
step two: according to an original flow channel design model, carrying out molded line extraction on the original flow channel design model to obtain a flow channel theoretical molded line;
step three: replacing an overlapping area of the stern lofting molded line and the runner theoretical molded line, and smoothing a transition area of the stern lofting molded line and the runner theoretical molded line to obtain a runner lofting molded line;
step four: splitting the runner lofting molded line, defining a runner region close to the inner side, two side transition regions of the runner region close to the inner side, and two side overlapping regions of the runner region close to the inner side and the stern lofting molded line as first runner regions, and defining a runner region close to the outer side, two side transition regions of the runner region close to the outer side, and two side overlapping regions of the runner region close to the outer side and the stern lofting molded line as second runner regions;
step five: smoothing is carried out on the first runner area and the second runner area respectively to obtain a first runner lofting molded line and a second runner lofting molded line;
step six: and arranging and splicing the stern lofting molded line, the first runner lofting molded line and the second runner lofting molded line.
Optionally, the first step further includes:
setting out the stern section line, and adjusting the three-way model value of the area which is not smooth until the stern section line is completely smooth;
and (4) defining rib number interpolation and generating a stern rib line.
Optionally, the theoretical molded line of the runner includes a theoretical rib line of the runner, a theoretical longitudinal section line of the runner, and a theoretical waterline of the runner.
Optionally, the runner lofting molded line includes a runner lofting rib line, a runner lofting longitudinal section line, and a runner lofting waterline.
Optionally, in the third step, "smoothing the transition region between the stern lofting molded line and the runner theoretical molded line" specifically includes: and fairing is carried out by adjusting the tangent point position of the circle-turning transition curve of the theoretical molded line of the runner and the stern lofting molded line.
Optionally, the fifth step further includes:
and respectively arranging the first runner lofting molded line and the second runner lofting molded line, and respectively placing the complete first runner lofting molded line and the complete second runner lofting molded line into respective databases.
Optionally, the fifth step further includes:
and outputting and generating curved surface data required by modeling according to the first runner lofting molded line and the second runner lofting molded line.
According to the lofting method of the stern section profile containing the runner, the runner lofting profiles are split and then are smoothed respectively, and the complete stern section profile containing the runner is obtained through arranging and splicing, so that the lofting precision is guaranteed, the lofting difficulty is reduced, the lofting efficiency is improved, and the smooth proceeding of the subsequent design modeling work is guaranteed.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
FIG. 2 is a partial stern rib profile chart of an embodiment of the present invention.
Fig. 3 is a diagram of a local flow path theoretical rib line according to an embodiment of the present invention.
Fig. 4 is a diagram of another local flow path theoretical rib line according to an embodiment of the present invention.
Fig. 5 is a diagram of a local runner lofting rib line according to an embodiment of the present invention.
Fig. 6 is a schematic partial structure diagram of an original flow channel design model according to an embodiment of the present invention.
FIG. 7 is a first runner lofting rib layout diagram according to an embodiment of the invention.
FIG. 8 is a second flowpath lofted rib profile view of an embodiment of the present invention.
Fig. 9 is a diagram of a complete rib profile after the six steps of arranging and splicing according to the embodiment of the invention.
Description of reference numerals:
s1, step one; s2, step two; s3, step three; s4, step four; s5, step five; s6, step six; 1. a stern rib profile; 2. designing a model of an original flow channel; 3. a flow channel theoretical rib line; 4. overlapping areas of stern lofting molded lines and runner theoretical molded lines; 5. transition regions of stern lofting molded lines and runner theoretical molded lines; 6. lofting the rib-shaped line by the first runner; 7. the second flow channel lofts the rib-shaped line.
Detailed Description
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
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.
Referring to fig. 1, the present embodiment provides a lofting method for a stern section line with a flow channel, including the following steps:
step one S1: and according to the original hull molded line, carrying out lofting fairing on the stern molded line and obtaining the stern lofting molded line.
Setting out a stern section line, and adjusting a section point three-way direction of a region which is not smooth until the stern section line is completely smooth; then, the rib number interpolation is defined and the stern rib line 1 is generated, please refer to fig. 2, in this embodiment, the rib number is 110-.
Step two S2: according to the original runner design model 2, molded lines of the original runner design model 2 are extracted to obtain a runner theoretical molded line, and the runner theoretical molded line comprises a runner theoretical rib line 3, a runner theoretical longitudinal line and a runner theoretical waterline. Fig. 3 shows a theoretical rib line 3 of the runner of the embodiment, and a theoretical longitudinal section line and a theoretical waterline of the runner can be obtained by the same method.
Step three S3: and replacing an overlapping area 4 of the stern lofting molded line and the runner theoretical molded line, fairing a transition area 5 of the stern lofting molded line and the runner theoretical molded line to obtain a runner lofting molded line, wherein the runner lofting molded line comprises a runner lofting rib line, a runner lofting longitudinal section line and a runner lofting waterline. Referring to fig. 4 and 5, the longitudinal section line of the runner lofting and the water line of the runner lofting can be obtained in the same manner.
The step of smoothing the transition region 5 between the stern lofting molded line and the runner theoretical molded line specifically comprises the following steps: and smoothing is carried out by adjusting the tangent point position of the circle-turning transition curve of the theoretical molded line of the runner and the lofting molded line of the stern.
Step four S4: the flow passage lofting molded line is split, please refer to fig. 6. And defining a flow channel area close to the inner side, a transition area at two sides of the flow channel area close to the inner side, and an overlapping area between the flow channel area close to the inner side and two sides of a stern lofting molded line as a first flow channel area, and defining a flow channel area close to the outer side, a transition area at two sides of the flow channel area close to the outer side, and an overlapping area between the flow channel area close to the outer side and two sides of the stern lofting molded line as a second flow channel area.
Step five S5: and respectively smoothing the first flow channel area and the second flow channel area to obtain a first flow channel lofting molded line and a second flow channel lofting molded line. Fig. 7 and 8 show the first channel lofted frame profile 6 and the second channel lofted frame profile 7, respectively, and other fairing lines can be derived in the same manner.
In this embodiment, the first runner lofting profile and the second runner lofting profile are sorted, and the complete first runner lofting profile and the complete second runner lofting profile are placed in respective databases. And outputting and generating curved surface data required by modeling according to the first runner lofting molded line and the second runner lofting molded line. And the smooth proceeding of the subsequent design modeling work is ensured.
Step six S6: and arranging and splicing the stern lofting molded line, the first runner lofting molded line and the second runner lofting molded line. Fig. 9 shows the complete rib molded lines after finishing and splicing, and other three-way molded lines can be obtained by the same method.
According to the lofting method of the stern section molded line containing the runner, the runner lofting molded lines are split and then are respectively smooth, and then the runner lofting molded lines are arranged and spliced to obtain the complete stern section molded line containing the runner, so that the lofting precision is guaranteed, the lofting difficulty is reduced, the lofting efficiency is improved, the first runner lofting molded line and the second runner lofting molded line can be respectively placed into respective databases to generate curved surface data required by modeling, and the smooth proceeding of the subsequent design modeling work is guaranteed.
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 (7)
1. A lofting method for a stern section line with a runner is characterized by comprising the following steps:
the method comprises the following steps: according to the original hull molded line, carrying out lofting fairing on the stern molded line and obtaining a stern lofting molded line;
step two: according to an original flow channel design model, carrying out molded line extraction on the original flow channel design model to obtain a flow channel theoretical molded line;
step three: replacing an overlapping area of the stern lofting molded line and the runner theoretical molded line, and smoothing a transition area of the stern lofting molded line and the runner theoretical molded line to obtain a runner lofting molded line;
step four: splitting the runner lofting molded line, defining a runner region close to the inner side, two side transition regions of the runner region close to the inner side, and two side overlapping regions of the runner region close to the inner side and the stern lofting molded line as first runner regions, and defining a runner region close to the outer side, two side transition regions of the runner region close to the outer side, and two side overlapping regions of the runner region close to the outer side and the stern lofting molded line as second runner regions;
step five: smoothing is carried out on the first runner area and the second runner area respectively to obtain a first runner lofting molded line and a second runner lofting molded line;
step six: and arranging and splicing the stern lofting molded line, the first runner lofting molded line and the second runner lofting molded line.
2. The method of lofting a runner-containing stern profile as defined in claim 1, wherein the first step further comprises:
setting out the stern section line, and adjusting the three-way model value of the area which is not smooth until the stern section line is completely smooth;
and (4) defining rib number interpolation and generating a stern rib line.
3. The method of lofting a runner-containing stern profile of claim 1, wherein the runner theoretical profile includes a runner theoretical rib line, a runner theoretical longitudinal line, and a runner theoretical waterline.
4. The method of lofting a runner-containing stern line of claim 1, wherein the runner lofting line includes a runner lofting rib line, a runner lofting longitudinal section line, and a runner lofting waterline.
5. The method for lofting a stern profile including a flow channel according to claim 1, wherein the step three of "fairing a transition region between the stern lofting profile and the flow channel theoretical profile" specifically includes: and fairing is carried out by adjusting the tangent point position of the circle-turning transition curve of the theoretical molded line of the runner and the stern lofting molded line.
6. The method of lofting a runner-containing stern profile as defined in claim 1, wherein said step five further comprises:
and respectively arranging the first runner lofting molded line and the second runner lofting molded line, and respectively placing the complete first runner lofting molded line and the complete second runner lofting molded line into respective databases.
7. The method of lofting a runner-containing stern profile as defined in claim 1, wherein said step five further comprises:
and outputting and generating curved surface data required by modeling according to the first runner lofting molded line and the second runner lofting molded line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811162728.9A CN109131739B (en) | 2018-09-30 | 2018-09-30 | Lofting method for stern section line with flow channel |
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| CN201811162728.9A CN109131739B (en) | 2018-09-30 | 2018-09-30 | Lofting method for stern section line with flow channel |
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| CN109131739A CN109131739A (en) | 2019-01-04 |
| CN109131739B true CN109131739B (en) | 2020-04-14 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110304197B (en) * | 2019-06-21 | 2021-03-02 | 中船黄埔文冲船舶有限公司 | Deck gunwale structure and linear lofting method thereof |
| CN110466682B (en) * | 2019-08-22 | 2021-05-11 | 中船黄埔文冲船舶有限公司 | Manufacturing method of arc transition deck |
| CN112278189B (en) * | 2020-11-02 | 2022-09-02 | 中船黄埔文冲船舶有限公司 | Lofting and unfolding method of irregular bulwark outer plate |
| CN113071628B (en) * | 2021-04-23 | 2022-03-15 | 中船黄埔文冲船舶有限公司 | Lofting method for stern section molded line containing shaft packing plate |
| CN113859468B (en) * | 2021-10-27 | 2022-11-29 | 中船黄埔文冲船舶有限公司 | Lofting method of stern section line containing pod prosthesis |
| CN115042934B (en) * | 2022-06-21 | 2024-03-26 | 中船黄埔文冲船舶有限公司 | Complicated upper building line fairing method |
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| US6564737B2 (en) * | 2000-05-16 | 2003-05-20 | Daniel Skira | Single-frame-curve method of designing and constructing hulls |
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Application publication date: 20190104 Assignee: GUANGZHOU WENCHONG SHIPYARD Co.,Ltd. Assignor: CSSC HUANGPU WENCHONG SHIPBUILDING Co.,Ltd. Contract record no.: X2021440000195 Denomination of invention: A setting out method of stern profile with runner Granted publication date: 20200414 License type: Common License Record date: 20211021 |
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