WO2016206343A1 - 一种非对称船型的光顺方法 - Google Patents

一种非对称船型的光顺方法 Download PDF

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WO2016206343A1
WO2016206343A1 PCT/CN2015/099883 CN2015099883W WO2016206343A1 WO 2016206343 A1 WO2016206343 A1 WO 2016206343A1 CN 2015099883 W CN2015099883 W CN 2015099883W WO 2016206343 A1 WO2016206343 A1 WO 2016206343A1
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stern
ship
line
asymmetric
smoothing
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PCT/CN2015/099883
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English (en)
French (fr)
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许培才
刘天夫
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广船国际有限公司
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Priority to EP15896226.6A priority Critical patent/EP3316153A4/en
Publication of WO2016206343A1 publication Critical patent/WO2016206343A1/zh

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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
    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2111/00—Details relating to CAD techniques
    • G06F2111/10—Numerical modelling

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  • the invention relates to the technical field of ships, and in particular to a smoothing method of an asymmetric ship type.
  • the smoothing criterion has the following: second-order smooth continuity, no extra inflection point, uniform curvature change, no excess deflection point, and uniform change in torsion.
  • the smoothness of the hull line type is achieved by smoothing the mutually orthogonal hull curves of X (cross section line), Y (longitudinal line) and Z (water line).
  • the above method can solve the smoothing of a part of the hull line type, for the asymmetric ship type, for example, the stern line type is asymmetrical left and right, and the stern outline is not at the middle longitudinal plane, if the existing orthogonal planes are interpolated with each other
  • the smoothing method due to the special reason of the linear twisting transition in the stern outline area, Lines (one of the Tribon systems for smoothing modules) cannot be arranged in an inherently regular manner when interpolating the waterline and the longitudinal section. Data points, the order of the data of each type of line is disordered, and it is impossible to directly smooth.
  • the object of the present invention is to provide a smoothing method which can be applied to the smoothing of an asymmetric ship type.
  • the smoothing workload is reduced and the smoothing cycle is shortened.
  • Step one dividing the hull of the asymmetric ship into a plurality of regions
  • Step 2 the line type of the area near the stern contour line is smoothed by the Pline line, and the line type of the other area of the asymmetric ship adopts orthogonal interpolation smoothing;
  • Step 3 Combine the line types of each area after smoothing
  • Step four generating a whole ship patch of the asymmetric ship
  • step five the entire ship Surface of the asymmetric ship is derived.
  • the hull of the asymmetric ship is divided into a bow and a stern at the bow, the bow is divided into a first bow and a second bow, and the first bow and the second bow are
  • the middle longitudinal plane of the hull is symmetrical with respect to each other
  • the stern contour is asymmetrical with respect to the middle longitudinal plane of the hull
  • the stern is divided into a first stern and a second stern
  • the first stern and the second stern are divided
  • the interface includes a mid-longitudinal and stern outline.
  • the first stern and the second stern after smoothing are merged into a smooth stern, and the smoothed first bow and second bow are merged into smoothing.
  • the bow of the ship then merges the smoothed stern and the smoothed bow into a smooth line of the entire ship.
  • the smoothed first stern cross section line and the first stern water line are disposed at a position opposite to the second stern cross section line and The setting position of the second stern line is staggered to ensure that the merger is smooth and the data points are arranged in order.
  • the distance between the set position of the smoothed first stern cross section line and the first stern water line and the second stern cross section line and the second stern water line is offset by 500 mm.
  • the smoothing of the entire ship line type is smoothed after the smoothing.
  • the existing bow contour, the stern contour line, the flat edge line, the flat bottom line, the stern shaft exit line and the highest water line are called out.
  • Whole ship patch boundary the range of a single patch boundary cannot cross lines and arcs at the same time, the number of single patch boundaries is less than or equal to 4 but try to avoid 3; by gradually increasing the boundary line and repeating the adjustment Try to create a complete ship patch that meets design and production requirements.
  • step 5 before the entire ship surface of the asymmetric ship is derived, an output ship type project is established, and the whole ship patch generated in the step 4 is added to the output ship type project; Add the stern outline to the Surface and output it together. Release the Surface file ⁇ GLHULL> with the "Release" command and import the file into the server for subsequent modeling.
  • the smoothing method of the asymmetric ship type in the present invention is that the asymmetric ship line type is divided into several different areas for smoothing, wherein the area near the complicated stern contour line is smoothed by the Pline line, and other areas are used.
  • the smoothing is performed by orthogonal interpolation; then the different regions after smoothing are merged.
  • the smoothing method combining Pline line and orthogonal interpolation the problem that the orthogonal interpolation smoothing can not solve the disordered arrangement of the horizontal line and the waterline data point is solved, and the smoothing problem of the asymmetric ship type line type is solved; By segmenting the reasonable area of the whole ship, the region of curvature change is decomposed into small relatively flat areas, which simplifies the complex line type, reduces the smoothing difficulty, and shortens the smoothing period.
  • Figure 1 is a line drawing of an asymmetric ship type provided by an embodiment of the present invention.
  • the stern contour line 2. The first stern cross-section line; 3. The first stern waterline; 4. The second stern cross-section line; 5. The second stern waterline; 6. The highest waterline; 7. The stern axis Export line.
  • Figure 1 is a line drawing of an asymmetric ship type provided by an embodiment of the present invention.
  • the Pline line is a three-dimensional curve for smoothing of the hull line type (for example, the Pline line for the linear smoothing of the hull in the Lines module of the Tribon system); the whole ship patch is the grid unit constituting the hull surface.
  • Surface refers to a digitized hull surface data packet.
  • a smoothing method for an asymmetric ship type the asymmetric ship has an asymmetrical stern, the line of the stern outline Type distortion, the steps are as follows:
  • the hull of the asymmetric ship is divided into a plurality of regions.
  • the hull of the asymmetric ship is divided into a bow and a stern at the bow, the bow is divided into a first bow and a second bow, and the first bow and the second bow are symmetrical with each other in a symmetrical plane of the hull, the stern
  • the contour 1 is asymmetrical with respect to the mid-longitudinal surface of the hull, the stern being divided into a first stern and a second stern, and the interface between the first stern and the second stern includes a mid-longitudinal and stern contour 1.
  • the line shape of the area near the stern contour line 1 is smoothed by the Pline line, and the line types of other areas of the asymmetric ship are orthogonally interpolated.
  • the range of the area around the stern contour 1 which is smoothed by the Pline line mentioned in the present invention can be selected according to the size of the hull.
  • the range of the region near the stern contour 1 which is smoothed by the Pline line mentioned in the present invention may be selected according to the curvature variation characteristics of the hull line shape.
  • an asymmetric ship with a displacement of 115,000 tons is taken as an example.
  • the vicinity is: in the lateral direction of the hull, from the stern contour 1 to the port 2.25 m, from the stern contour 1 to the starboard side at 0.01 m; In the longitudinal direction, the length direction of the port side is -4.6 to 34 m, and the length direction of the starboard is -4.6 to 25.6 m.
  • Step 3 Combine the line types of each area after smoothing, merge the smoothed first stern and the second stern into a smooth stern, and merge the smoothed first bow and second bow into smoothing.
  • the bow of the ship then merges the smoothed stern and the smoothed bow into a smooth line of the entire ship.
  • step four a complete ship patch of the asymmetric ship is generated.
  • step five the entire ship Surface of the asymmetric ship is derived.
  • the first stern cross section 2 and the first stern line 3 are arranged after the smoothing and the second stern cross section 4 and the
  • the setting position of the two stern water lines 5 is staggered to ensure smooth integration and data points in order.
  • the distance between the set position of the smoothed first stern cross section 2 and the first stern line 3 and the set position of the second stern cross section 4 and the second stern line 5 is 500 mm, and the stagger distance
  • the size may be determined on a case-by-case basis and is not limited to 500 mm.
  • the splicing of the whole ship line type is partially smoothed, and the joints of the combined ship type line type should be mainly checked and corrected, and the area with irregular curvature is partially corrected.
  • the highest waterline 6 of the entire ship type needs to be processed to make a whole ship waterline for the convenience of subsequent life. Into a patch.
  • step 4 before the new patch boundary line is generated, the existing bow contour line, the stern contour line 1, the flat side line, the flat bottom line, the stern shaft exit line 7 and the highest water line 6 need to be called out as a whole ship patch. Boundary; the range of a single patch boundary cannot cross straight lines and arcs at the same time. The number of single patch boundaries is less than or equal to 4, but try to avoid 3, to eliminate the resulting patched corner points. By gradually increasing the boundary line Repeated commissioning to create a complete ship patch that meets design and production requirements. Since the number of patches having a boundary number of 3 is as small as possible, the number of patches having a boundary number of 3 can be reduced. For example, the number of patches with a boundary number of 3 is minimized.
  • step 5 before exporting the entire ship's Surface, the output ship type project needs to be established, and the whole ship patch generated in step 4 is added to the output ship type project; at the same time, the complex space curve is added to the Surface and output together. , release the Surface file ⁇ GLHULL> through the "Release" command, and import the file into the server for subsequent modeling use.

Abstract

一种非对称船型的光顺方法，涉及船舶技术领域，非对称船具有非对称船尾，船尾轮廓线的线型扭曲，所述方法包括以下步骤：步骤一，将所述非对称船的船体分为多个区域；步骤二，所述船尾轮廓线附近区域的线型采用Pline线进行光顺，非对称船的其他区域的线型采用正交插值光顺；步骤三，合并光顺后各区域的线型；步骤四，生成所述非对称船的整船Patch；步骤五，导出所述非对称船的整船Surface。所述方法能够克服以往光顺方法不能用于非对称船型的缺点，减少光顺工作量，缩短光顺周期。

Description

一种非对称船型的光顺方法
本专利申请要求于2015年06月23日提交的，申请号为201510351739.1，申请人为广船国际有限公司，发明名称为“一种非对称船型的光顺方法”的中国专利申请的优先权，该申请的全文以引用的方式并入本申请中。
技术领域
本发明涉及船舶技术领域，尤其涉及一种非对称船型的光顺方法。
背景技术
光顺是CAD/CAM(Computer Aided Design/Computer Aided Manufacturing)中非常重要的问题，在飞机、船舶、汽车及模具等外形设计中有重要应用。对于曲线而言，光顺准则有如下几种：二阶光滑连续性，没有多余的拐点，曲率变化均匀，没有多余变挠点，挠率变化均匀。目前船体线型的光顺，是通过对X(横剖线)、Y(纵剖线)和Z(水线)三组相互正交的船体曲线进行光顺来实现的。首先对横剖线进行光顺，然后对纵剖线重新插值并进行光顺，最后对水线进行插值并光顺；待纵剖线和水线均光顺完毕后，更新横剖线并继续光顺，如此循环，直到符合设计和生产要求的光顺程度为止。虽然以上方法能解决一部分船体线型的光顺，但是对于非对称船型，例如船尾部线型左右不对称，且船尾轮廓线不在中纵面处的情况，如果用现有的正交面相互插值的光顺方法，由于船尾轮廓线区域的线型扭曲过渡的特殊原因，插值水线和纵剖线时，Lines(Tribon系统其中一个用于光顺线型的模块)无法按固有规律排列每个数据点，每条型线的数据排列顺序产生紊乱，根本无法直接进行光顺。况且，由于线型不对称，无法像对称船型那样只光顺左舷线型，船体左右舷线型都必须分别进行光顺，工作量将比对称船型多出不止两倍。
发明内容
本发明的目的在于提出一种光顺方法，能够适用于非对称船型的光顺，使 得光顺工作量减少，缩短光顺周期。
为达此目的，本发明采用以下技术方案：
一种非对称船型的光顺方法，所述非对称船具有非对称船尾，船尾轮廓线的线型扭曲，所述光顺方法包括以下步骤：
步骤一，将所述非对称船的船体分为多个区域；
步骤二，所述船尾轮廓线附近区域的线型采用Pline线进行光顺，非对称船的其他区域的线型采用正交插值光顺；
步骤三，合并光顺后各区域的线型；
步骤四，生成所述非对称船的整船Patch；
步骤五，导出所述非对称船的整船Surface。
进一步的技术方案，所述步骤一中，所述非对称船的船体在船舯处分为船首和船尾，所述船首分为第一船首和第二船首，所述第一船首和第二船首以船体的中纵面为对称面而相互对称，所述船尾轮廓线相对船体的中纵面不对称，所述船尾分为第一船尾和第二船尾，所述第一船尾和第二船尾的分界面包括中纵面和船尾轮廓线。
进一步的技术方案，所述步骤三中，将光顺后的所述第一船尾、第二船尾合并为光顺后的船尾，将光顺后的第一船首、第二船首合并为光顺后的船首，然后将所述光顺后的船尾和光顺后的船首合并为光顺后的整船线型。
进一步的技术方案，所述光顺后的第一船尾和第二船尾合并时，所述光顺后的第一船尾横剖线和第一船尾水线的设置位置与第二船尾横剖线和第二船尾水线的设置位置错开，用于保证合并顺利、数据点按顺序排列。
进一步的技术方案，所述光顺后的第一船尾横剖线和第一船尾水线的设置位置与第二船尾横剖线和第二船尾水线的设置位置错开的距离为500mm。
进一步的技术方案，所述光顺后整船线型的合缝处进行局部光顺。
进一步的技术方案，所述步骤四中，在生成新的Patch边界线前，将已存在的船首轮廓线、船尾轮廓线、平边线、平底线、船尾轴出口线及最高水线调出用作整船Patch边界；单个Patch边界的范围不能同时跨越直线和弧线，单个Patch边界的个数小于等于4但尽量避免为3；通过逐步增加边界线并反复调 试，创建满足设计和生产要求的整船Patch。
进一步的技术方案，所述步骤五中，导出所述非对称船的整船Surface前，建立输出船型项目，并将所述步骤四中生成的整船Patch添加到所述输出船型项目中；同时，将船尾轮廓线添加到Surface中一同输出，通过“Release”指令释放出Surface文件<GLHULL>，并将该文件导入到服务器中以供后续建模使用。
本发明的有益效果：
本发明中的非对称船型的光顺方法，是将该非对称船线型分为几个不同区域分别进行光顺，其中比较复杂的船尾轮廓线处附近区域利用Pline线进行光顺，其他区域通过正交插值光顺；然后再将分别光顺后的不同区域合并。通过Pline线与正交插值相结合的光顺方法，解决了正交插值光顺无法解决的横剖线与水线数据点排列顺序紊乱的问题，解决了非对称船型线型的光顺问题；通过对整船合理的区域分割，将曲率剧变区域分解成小的相对平缓区域，使复杂的线型简单化，降低了光顺难度，缩短了光顺周期。
附图说明
图1是本发明具体实施方式提供的非对称船型的型线图。
1、船尾轮廓线；2、第一船尾横剖线；3、第一船尾水线；4、第二船尾横剖线；5、第二船尾水线；6、最高水线；7、船尾轴出口线。
具体实施方式
下面结合附图并通过具体实施方式来进一步说明本发明的技术方案。
图1是本发明具体实施方式提供的非对称船型的型线图。
本发明中，Pline线是用于船体线型光顺的三维曲线(如，Tribon系统的Lines模块中用于船体线形光顺的Pline线)；整船Patch，即为组成船体曲面的网格单元；Surface是指数字化的船体曲面数据包。
一种非对称船型的光顺方法，非对称船具有非对称船尾，船尾轮廓线的线 型扭曲，步骤如下：
步骤一，将非对称船的船体分为多个区域。优选地，将非对称船的船体在船舯处分为船首和船尾，船首分为第一船首和第二船首，第一船首和第二船首以船体的中纵面为对称面而相互对称，船尾轮廓线1相对船体的中纵面不对称，船尾分为第一船尾和第二船尾，第一船尾和第二船尾的分界面包括中纵面和船尾轮廓线1。
步骤二，船尾轮廓线1附近区域的线型采用Pline线进行光顺，非对称船的其他区域的线型采用正交插值光顺。本发明中提到的采用Pline线进行光顺的船尾轮廓线1附近区域的范围可根据船体的大小不同选择不同的尺寸。或者，本发明中提到的采用Pline线进行光顺的船尾轮廓线1附近区域的范围可根据船体线形的曲率变化特征选择不同的尺寸。本发明中以11.5万吨排水量的非对称船为例，该附近区域为：在船体横向方向上，由船尾轮廓线1至左舷2.25m处，由船尾轮廓线1至右舷0.01m处；在船体长度方向上，左舷的长度方向范围为-4.6～34m，右舷的长度方向范围-4.6～25.6m。
步骤三，合并光顺后各区域的线型，将光顺后的第一船尾、第二船尾合并为光顺后的船尾，将光顺后的第一船首、第二船首合并为光顺后的船首，然后将光顺后的船尾和光顺后的船首合并为光顺后的整船线型。
步骤四，生成非对称船的整船Patch。
步骤五，导出非对称船的整船Surface。
步骤三中，光顺后的第一船尾和第二船尾合并时，光顺后的第一船尾横剖线2和第一船尾水线3的设置位置与第二船尾的横剖线4和第二船尾水线5的设置位置错开，用于保证合并顺利、数据点按顺序排列。具体地，光顺后的第一船尾横剖线2和第一船尾水线3的设置位置与第二船尾横剖线4和第二船尾水线5的设置位置错开的距离为500mm，错开距离大小可根据具体情况而定，不限定为500mm。
合并后，对整船线型的合缝处进行局部光顺，对合并后的整船线型的合缝处左右应进行重点检查，对曲率不顺的区域进行局部修正。
该整船线型的最高水线6需进行处理，做成一条整船水线，以方便后续生 成Patch。
步骤四中，在生成新的Patch边界线前，需将已存在的船首轮廓线、船尾轮廓线1、平边线、平底线、船尾轴出口线7及最高水线6调出用作整船Patch边界；单个Patch边界的范围不能同时跨越直线和弧线，单个Patch边界的个数小于等于4，但尽量避免为3，用于消除由此而出现的退化的Patch角点；通过逐步增加边界线并反复调试，创建满足设计和生产要求的整船Patch。由于边界个数为3的Patch的个数越少越好，因此，可以缩减边界个数为3的Patch的数量。例如，将边界个数为3的Patch的数量最小化。
步骤五中，导出非对称船的整船Surface前，需建立输出船型项目，并将步骤四中生成的整船Patch添加到输出船型项目中；同时，将复杂的空间曲线添加到Surface中一同输出，通过“Release”指令释放出Surface文件<GLHULL>，并将该文件导入到服务器中以供后续建模使用。
显然，本发明的上述实施例仅是为了清楚说明本发明所作的举例，而并非是对本发明的实施方式的限定。对于所属领域的普通技术人员来说，在上述说明的基础上还可以做出其它不同形式的变化或变动。这里无需也无法对所有的实施方式予以穷举。凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明权利要求的保护范围之内。

Claims (8)

  1. 一种非对称船型的光顺方法，所述非对称船具有非对称船尾，船尾轮廓线的线型扭曲，其特征在于，所述方法包括以下步骤，
    步骤一，将所述非对称船的船体分为多个区域；
    步骤二，所述船尾轮廓线(1)附近区域的线型采用Pline线进行光顺，非对称船的其他区域的线型采用正交插值光顺；
    步骤三，合并光顺后各区域的线型；
    步骤四，生成所述非对称船的整船Patch；
    步骤五，导出所述非对称船的整船Surface。
  2. 根据权利要求1所述的非对称船型的光顺方法，其特征在于，所述步骤一中，所述非对称船的船体在船舯处分为船首和船尾，所述船首分为第一船首和第二船首，所述第一船首和第二船首以船体的中纵面为对称面而相互对称，所述船尾轮廓线(1)相对船体的中纵面不对称，所述船尾分为第一船尾和第二船尾，所述第一船尾和第二船尾的分界面包括中纵面和船尾轮廓线(1)。
  3. 根据权利要求1所述的非对称船型的光顺方法，其特征在于，所述步骤三中，将光顺后的所述第一船尾、第二船尾合并为光顺后的船尾，将光顺后的第一船首、第二船首合并为光顺后的船首，然后将所述光顺后的船尾和光顺后的船首合并为光顺后的整船线型。
  4. 根据权利要求3所述的非对称船型的光顺方法，其特征在于，所述光顺后的第一船尾和第二船尾合并时，所述光顺后的第一船尾横剖线(2)和第一船尾水线(3)的设置位置与第二船尾横剖线(4)和第二船尾水线(5)的设置位置错开，用于保证合并顺利、数据点按顺序排列。
  5. 根据权利要求4所述的非对称船型的光顺方法，其特征在于，所述光顺后的第一船尾横剖线(2)和第一船尾水线(3)的设置位置与第二船尾横剖线(4)和第二船尾水线(5)的设置位置错开的距离为500mm。
  6. 根据权利要求3所述的非对称船型的光顺方法，其特征在于，所述光顺后整船线型的合缝处进行局部光顺。
  7. 根据权利要求1所述的非对称船型的光顺方法，其特征在于，所述步骤四中，在生成新的Patch边界线前，将已存在的船首轮廓线、船尾轮廓线(1)、 平边线、平底线、船尾轴出口线(7)及最高水线(6)调出用作整船Patch边界；单个Patch边界的范围不同时跨越直线和弧线，单个Patch边界的个数小于等于4，且缩减边界个数为3的Patch的数量；通过逐步增加边界线并反复调试，创建满足设计和生产要求的整船Patch。
  8. 根据权利要求1所述的非对称船型的光顺方法，其特征在于，所述步骤五中，导出所述非对称船的整船Surface前，建立输出船型项目，并将所述步骤四中生成的整船Patch添加到所述输出船型项目中；同时，将复杂的空间曲线添加到Surface中一同输出，通过“Release”指令释放出Surface文件<GLHULL>，并将该文件导入到服务器中以供后续建模使用。
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