CN112163310B - Elbow-shaped draft tube full-parametric three-dimensional modeling method - Google Patents
Elbow-shaped draft tube full-parametric three-dimensional modeling method Download PDFInfo
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Abstract
The invention relates to the technical field of three-dimensional digital model construction, and discloses a fully-parameterized three-dimensional modeling method for an elbow-shaped draft tube, which comprises the following steps: the method comprises the steps of establishing a draft tube input shafting and a section single line diagram component, outputting a section single line outline, 8 coupling points and 1 central point, wherein the 8 coupling points are used for node coupling of adjacent single line diagrams, generating a central axis by fitting the central points of all the single line diagrams, taking the central axis of the draft tube as a ridge line, correspondingly coupling and lofting two adjacent single line diagrams according to coupling point numbers, establishing a segmented entity component, outputting segmented entities, and generating a draft tube integral entity model by performing Boolean combination operation on all the segmented entities. The invention relates to a fully-parameterized three-dimensional modeling method for an elbow-shaped draft tube, which takes a design table containing positioning parameters and dimension parameters of each section as input, quickly establishes a fully-parameterized three-dimensional model of the elbow-shaped draft tube and can dynamically modify the model.
Description
Technical Field
The invention relates to the technical field of model construction, in particular to a full-parametric three-dimensional modeling method for an elbow-shaped draft tube.
Background
The elbow-shaped draft tube of a hydropower station workshop is an important flow passage component of a reaction type water turbine, the structure of the elbow-shaped draft tube is a large-span cavity special-shaped body, the shape is complex, the stress is complex, and the size and the shape of the elbow-shaped draft tube influence the investment of civil engineering at the lower part of the hydropower station and the operation efficiency and stability of the water turbine to a great extent.
The elbow-shaped draft tube body of the plant is obtained by a hydraulics experiment, the body coordinate and the size are used as main control parameters, and due to the fact that the design and construction precision requirements of the elbow-shaped draft tube are high, the establishment of a full-parameter high-precision three-dimensional model is of great significance for optimizing the size of the draft tube structure and the design of the hydropower station plant. The elbow-shaped draft tube design modeling of the existing factory building is limited to a simplified sectional shaping model, the design modeling method is relatively complex, the precision cannot be guaranteed, the model is modified fussy, and the model is required to be completely built again each time the model is modified. Some method establishes a section outline according to a single line diagram one by one, establishes a model curved surface and an entity by multi-section lofting, has better improvement on the parameterization degree, but needs to manually establish the coupling relation of the geometric nodes of the single line diagram when establishing a three-dimensional model of a draft tube, has more operation steps, and generates errors according to the lofting of the original coupling relation when the coupling relation is changed due to the change of the nodes of two adjacent single line diagrams, so that the structural optimization cannot be smoothly carried out, and the action of the three-dimensional model is limited.
Disclosure of Invention
The invention aims to provide a fully-parameterized three-dimensional modeling method for the elbow-shaped draft tube, which takes a design table containing positioning parameters and dimension parameters of each section as input, quickly establishes a fully-parameterized three-dimensional model of the elbow-shaped draft tube and can dynamically modify the model.
In order to achieve the purpose, the invention designs a full-parametric three-dimensional modeling method for the elbow-shaped draft tube, which comprises the following steps:
1) Establishing a draft tube input shaft system, wherein the shaft system is a right-hand system, the origin of the shaft system is the central point of the bottom surface of a conical pipe section of the elbow-shaped draft tube, the Y axis of the shaft system is the negative elevation direction of the central line of the unit, and the X axis of the shaft system is the following water flow direction;
2) Establishing a cross-section single line diagram component, wherein an input element is a draft tube input shafting, input parameters are a single line diagram data table and the number of the single line diagram, the cross-section single line contour, 8 coupling points and 1 central point are output, and the 8 coupling points are used for node coupling of adjacent single line diagrams;
3) Fitting and generating a central axis by using central points of all the single line diagrams;
4) Taking the central axis of the draft tube as a ridge line, correspondingly coupling and lofting two adjacent single line diagrams according to the number of coupling points, establishing a segmented entity assembly, inputting two adjacent single line diagrams and the central axis of the draft tube as elements, and outputting a segmented entity;
5) And generating a draft tube integral entity model by performing Boolean combination operation on all the segmented entities.
Preferably, in step 2), the single-line diagram component establishing process is as follows:
2a) Establishing a single line diagram plane local coordinate system, wherein the axis system is a right-hand system, the connecting line direction of a single line diagram locating point a (xa, ya, 0) and a locating point i (xi, yi, 0) is the V axial direction of the plane local axis, the middle point of the connecting line is the origin, and the U axial direction of the plane local axis is parallel to the Z axis of the draft tube input axis system;
2b) Establishing a single-line diagram outline in a plane local coordinate system according to the single-line diagram size parameter;
2c) Establishing 8 coupling points on the single line diagram outline in the UV axial direction of a plane local coordinate system;
2d) And encapsulating the steps and establishing the single line diagram component.
Preferably, in step 2), 8 coupling points are established by the single-line diagram component, so that adjacent single-line diagram profiles are correspondingly coupled according to the number of the coupling points, where the coupling point 1 is a point where V is the largest and then U is the smallest on the profile, the coupling point 2 is a point where V is the largest and then U is the largest on the profile, the coupling point 3 is a point where U is the largest and then V is the largest on the profile, the coupling point 4 is a point where U is the largest and then V is the smallest on the profile, the coupling point 5 is a point where V is the smallest and then U is the largest on the profile, the coupling point 6 is a point where V is the smallest and then U is the smallest on the profile, the coupling point 7 is a point where U is the smallest and then V is the smallest on the profile, and the coupling point 8 is a point where U is the smallest and then V is the largest on the profile.
Preferably, in the step 2), the single line diagram has at most 8 nodes and less than 8 nodes in the single line diagram geometry, and there are 2 coupling points in the same node, that is, the coupling points coincide, but the coincidence of 3 or more coupling points does not occur.
Preferably, in the step 4), the coupling of the nodes of the adjacent single-line diagrams is subdivided into 8 types of coupling relationships, so that the nodes on the adjacent single-line diagrams are automatically coupled correspondingly:
class 1: the contour coupling points of the adjacent 2 single line diagrams are not overlapped or the numbers of the overlapped coupling points are not corresponding completely, namely under the condition that the coupling relation lines of the 8 corresponding coupling points are not overlapped, establishing a draft tube subsection entity according to the 8 coupling relation lines;
class 2: only 1 pair of coincident coupling points with consistent serial numbers are formed, namely 1 pair of coincidence exists in 8 coupling relation lines, and when the 1 st coupling point is coincident with the 2 nd coupling point, a draft tube subsection entity is established according to 7 coupling relation lines;
class 3: 1 pair of the 8 coupling relation lines are overlapped, when the 5 th coupling relation line is overlapped with the 6 th coupling relation line, a draft tube subsection entity is established according to the 7 coupling relation lines, and the rest positions are overlapped like 3 and 4, 7 and 8, and the like, so that the characteristics of the draft tube body shape are not considered;
class 4: only 2 pairs of coincident coupling points with consistent serial numbers are overlapped, namely 2 of 8 coupling relation lines are overlapped, and when the 1 st coupling relation line is overlapped with the 2 nd coupling relation line, and the 5 th coupling relation line is overlapped with the 6 th coupling relation line, a draft tube subsection entity is established according to the 6 coupling relation lines;
class 5: 2 of the 8 coupling relation lines are overlapped, when the 3 rd pipe is overlapped with the 4 th pipe and the 7 th pipe is overlapped with the 8 th pipe, a draft tube subsection entity is established according to the 6 coupling relation lines, and the rest positions are overlapped as 1, 2, 3, 4, 1, 2, 7, 8, 3, 4, 5, 6, 5, 7, 8 and the like, so that the characteristics of the draft tube body shape are not considered because the characteristics of the draft tube body shape are not met;
class 6: only 3 pairs of coincident coupling points with consistent serial numbers are obtained, namely 3 of 8 coupling relation lines are coincident, and when the 1 st coupling line is coincident with the 2 nd coupling line, the 3 rd coupling line is coincident with the 4 th coupling line, and the 7 th coupling line is coincident with the 8 th coupling line, a draft tube subsection entity is established according to the relation of the 5 coupling lines;
class 7: 3 pairs of 8 coupling relation lines are overlapped, when the 3 rd is overlapped with the 4 th, the 5 th is overlapped with the 6 th and the 7 th is overlapped with the 8 th, a tail water pipe subsection entity is established according to the 5 coupling relation lines, and the rest positions such as the overlapping of 1, 2, 3, 4, 5, 1, 2, 5, 6, 7, 8 and the like do not meet the characteristics of tail water pipe shaping and are not considered;
class 8: there are 4 pairs of unanimous coincidence coupling points of serial number, there are 4 coincidences in 8 coupling relation lines, two single line diagram outlines are the circle or are the rectangle (circular single line diagram coupling point 1 number and 2, 3 numbers and 4, 5 numbers and 6, 7 numbers and 8 coincidences), to this kind of outline similarity, the geometry node corresponds two single line diagrams completely, adopt single line diagram profile geometry node to correspond the coupling, establish the draft tube segmentation entity, coincidence more than 4, because of not satisfying the characteristics of draft tube body configuration, do not consider.
Compared with the prior art, the invention has the following advantages:
1. the method takes the experimental parameters of a design table containing the positioning of each section and the dimension parameters of the section as input, refines and upgrades the method for generating the three-dimensional model by single line diagram lofting, realizes the full-parametric three-dimensional modeling of the draft tube, and can quickly establish and dynamically modify the draft tube three-dimensional model;
2. because the three-dimensional model is completely associated with the input parameters, the model can be dynamically modified and automatically updated along with the parameters, and the time for designing, modeling, modifying and updating the draft tube is shortened;
3. the elbow-shaped draft tube gradually deforms in a streamline manner, the model adopts a single line diagram and a node coupling uniform transition lofting method, the consistency of the draft tube runner solid model and a real runner body is ensured, and the accuracy and the reliability of structural calculation analysis are ensured.
Drawings
FIG. 1 is a flow chart of the modeling of a fully parameterized three-dimensional model of an elbow draft tube according to the present invention;
FIG. 2 is a schematic diagram of a single line diagram cross-sectional single line profile location in the present invention;
FIG. 3 is a schematic diagram of a single line diagram component of the present invention;
FIG. 4 is a diagram illustrating the corresponding coupling according to the single line diagram coupling point number in the present invention;
FIG. 5 is a schematic diagram of two single lines of the present invention lofted according to 8 coupling relationship lines;
FIG. 6 is a schematic diagram of two single line diagrams of the present invention lofting according to 7 coupling relationship lines (1 and 2 coinciding);
FIG. 7 is a schematic diagram of two single lines of the present invention laid out according to 7 coupling relationship lines (5 and 6 coincident);
FIG. 8 is a schematic diagram of two single lines of the present invention laid out with 6 coupling relationship lines (1 and 2, and 5 and 6 coincident);
FIG. 9 is a schematic diagram of the present invention showing the two single lines lofted according to 6 coupling relationship lines (3 and 4, and 7 and 8 coincident);
FIG. 10 is a schematic diagram of two single lines of the present invention laid out with 5 coupling relationship lines (1 and 2, 3 and 4, and 7 and 8 coincident);
FIG. 11 is a schematic diagram of two single lines of the present invention laid out with 5 coupling relationship lines (3 and 4, 5 and 6, and 7 and 8 coincident);
FIG. 12 is a schematic diagram of two single line diagrams corresponding coupling (4 coupling relationship lines are overlapped) lofting according to geometric nodes in the invention;
FIG. 13 is a diagram illustrating the activation of a corresponding coupling relationship entity segment model in 3DE according to an embodiment of the present invention;
FIG. 14 is a schematic diagram of a solid model of an elbow draft tube in 3DE according to an embodiment of the present invention;
FIG. 15 is a schematic diagram of a dynamic modified model of changing round into square in 3DE to round into city gate opening according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
A full-parametric three-dimensional modeling method for an elbow-shaped draft tube comprises the following steps:
1) Establishing a draft tube input shaft system, wherein the shaft system is a right-hand system, the origin of the shaft system is the central point of the bottom surface of a conical pipe section of the elbow-shaped draft tube, the Y axis of the shaft system is the negative elevation direction of the central line of the unit, and the X axis of the shaft system is the following water flow direction;
2) Establishing a cross-section single line diagram component, wherein an input element is a draft tube input shafting, input parameters are a single line diagram data table and a single line diagram number, a cross-section single line contour, 8 coupling points and 1 central point are output, the 8 coupling points are used for node coupling of adjacent single line diagrams, the single line diagram cross-section single line contour is positioned as shown in figure 2, and the single line diagram component is shown in figure 3;
3) Fitting and generating a central axis by using central points of all the single line diagrams;
4) Taking the central axis of the draft tube as a ridge line, correspondingly coupling and lofting two adjacent single line diagrams according to coupling point numbers, and establishing a segmented entity assembly as shown in figure 4, wherein input elements are the two adjacent single line diagrams and the central axis of the draft tube, and outputting a segmented entity;
5) And generating a draft tube integral entity model by performing Boolean combination operation on all the segmented entities.
In step 2), the single line diagram component establishing process is as follows:
2a) Establishing a single line diagram plane local coordinate system, wherein the axis system is a right-hand system, the connecting line direction of a single line diagram locating point a (xa, ya, 0) and a locating point i (xi, yi, 0) is the V axial direction of the plane local axis, the middle point of the connecting line is the origin, and the U axial direction of the plane local axis is parallel to the Z axis of the draft tube input axis system;
2b) Establishing a single line diagram outline in a plane local coordinate system according to the single line diagram size parameter;
2c) The method comprises the following steps of axially establishing 8 coupling points on the outline of a single line diagram by a plane local coordinate system UV;
2d) And encapsulating the steps and establishing the single line diagram component.
In addition, 8 coupling points are established in the single line diagram component, adjacent single line diagram outlines are correspondingly coupled according to the number of the coupling points, the coupling point 1 is a point with the maximum V direction and the minimum U direction on the outline, the coupling point 2 is a point with the maximum V direction and the maximum U direction on the outline, the coupling point 3 is a point with the maximum U direction and the maximum V direction on the outline, the coupling point 4 is a point with the maximum U direction and the minimum V direction on the outline, the coupling point 5 is a point with the minimum V direction and the maximum U direction on the outline, the coupling point 6 is a point with the minimum V direction and the minimum U direction on the outline, the coupling point 7 is a point with the minimum U direction and the minimum V direction on the outline, the coupling point 8 is a point with the minimum U direction and the maximum V direction on the outline, the single line diagram with the maximum 8 nodes and less than 8 nodes exists, 2 coupling points exist in the same node, namely the coupling points are overlapped, but the conditions that 3 coupling points and more overlap do not occur.
In step 4), the node coupling of the adjacent single line diagrams is subdivided into 8 types of coupling relations, so that the nodes on the adjacent single line diagrams are automatically coupled correspondingly:
class 1: when the contour coupling points of the adjacent 2 single line diagrams are not overlapped or the numbers of the overlapped coupling points are not corresponding completely, namely the coupling relation lines of the 8 corresponding coupling points are not overlapped, as shown in figure 5, a draft tube subsection entity is established according to the 8 coupling relation lines;
class 2: only 1 pair of coincident coupling points with consistent serial numbers are found, namely 1 pair of coincidence exists in 8 coupling relation lines, and when the 1 st coupling point is coincident with the 2 nd coupling point, as shown in figure 6, a draft tube subsection entity is established according to 7 coupling relation lines;
class 3: 1 pair of the 8 coupling relationship lines are overlapped, and when the 5 th coupling relationship line is overlapped with the 6 th coupling relationship line, as shown in figure 7, a draft tube subsection entity is established according to the 7 coupling relationship lines;
class 4: only 2 pairs of coincident coupling points with consistent serial numbers are formed, namely 2 of 8 coupling relation lines are coincident, and when the 1 st coupling relation line is coincident with the 2 nd coupling relation line, and the 5 th coupling relation line is coincident with the 6 th coupling relation line, as shown in figure 8, a draft tube subsection entity is established according to the 6 coupling relation lines;
class 5: 2 of the 8 coupling relationship lines are overlapped, and when the 3 rd line is overlapped with the 4 th line and the 7 th line is overlapped with the 8 th line, as shown in figure 9, a draft tube subsection entity is established according to the 6 coupling relationship lines;
class 6: only 3 pairs of coincident coupling points with consistent serial numbers are provided, namely 3 of 8 coupling relation lines are coincident, and when the 1 st coupling line is coincident with the 2 nd coupling line, the 3 rd coupling line is coincident with the 4 th coupling line, and the 7 th coupling line is coincident with the 8 th coupling line, as shown in figure 10, a draft tube subsection entity is established according to the relation of the 5 coupling lines;
class 7: 3 pairs of 8 coupling relationship lines are overlapped, and when the 3 rd line is overlapped with the 4 th line, the 5 th line is overlapped with the 6 th line, and the 7 th line is overlapped with the 8 th line, as shown in figure 11, a draft tube subsection entity is established according to the 5 coupling relationship lines;
class 8: there are 4 pairs of coincident coupling points with identical numbers, that is, 4 coincident coupling points in 8 coupling relation lines, the outlines of the two single line diagrams are both circles or both rectangles, for the two single line diagrams with similar outlines and geometric nodes completely corresponding to the two single line diagrams, as shown in fig. 12, the geometric nodes of the single line diagrams are correspondingly coupled to establish a draft tube subsection entity.
The technical solution of the present invention is described in detail below with reference to the 3DE software embodiment:
1) Establishing a draft tube input shaft system, wherein the shaft system is a right-hand system, the origin of the shaft system is the central point of the bottom surface of a conical pipe section of the elbow-shaped draft tube, the Y axis of the shaft system is the negative elevation direction of the central line of the unit, and the X axis of the shaft system is the following water flow direction;
2) The method comprises the steps of establishing a section single line diagram user characteristic as a single line diagram component, taking an input shaft of a draft tube as an input condition, taking a single line diagram data table and the number of the single line diagram as input parameters, establishing the section single line diagram user characteristic as the component, and outputting a section single line outline, 8 coupling points and 1 central point by the component.
The single line diagram component establishing process comprises the following steps:
2a) Establishing a single line diagram positioning parameter: xa, ya, xi, yi, establishing single line diagram size parameters: the method comprises the following steps of Bl, br, H, ri and Ra, wherein parameter values are correspondingly associated with a certain row of a single line diagram data table, a local coordinate system is established on a single line diagram plane, a shaft system is a right-hand system, a positioning point a (xa, ya, 0) and a positioning point i (xi, yi, 0) are established, the connecting direction of the connecting point a and the point i is the V axial direction of a plane local axis, the middle point of the connecting line is an original point, and the U axial direction of the plane local axis is parallel to the Z axis of a draft tube input shaft system;
2b) Drawing a single-line diagram outline sketch in a plane local coordinate system, and relating the sketch with the size parameters;
2c) Establishing 8 coupling points on the outline of the single line diagram;
2d) Packaging the process, and establishing a cross-section single line diagram user characteristic component;
3) Fitting and generating a central axis of the draft tube by using central points of all the single line diagrams;
4) Establishing a user characteristic of a draft tube subsection entity as a component, establishing the subsection entity by taking two adjacent single line diagram components and a central axis as input, and outputting the draft tube subsection entity, wherein the central axis of the draft tube is taken as a ridge line, 2 adjacent single line diagrams are correspondingly coupled according to 8 coupling point numbers, and an elbow-shaped draft tube subsection is obtained by multi-section lofting, and the process is as follows:
4a) Respectively establishing 8 types of draft tube segment solid models according to 8 types of coupling relations;
4b) Writing rules, activating the current coupling relation draft tube segment entity model according to the superposition condition of the coupling relation lines of the coupling points of the two adjacent single line diagrams, and deactivating the rest 7 entity segment models, as shown in fig. 13;
4c) Packaging the steps into user characteristics in 3de, and establishing a draft tube subsection entity assembly;
4d) All the draft tube segment entities are placed in a geometric body, and an integral entity model is generated through automatic Boolean operation, as shown in FIG. 14.
In the embodiment, a draft tube input shaft is used as an input condition, a draft tube single line diagram data table is used as an input parameter value, an elbow-shaped draft tube three-dimensional model is quickly and automatically established by using a 3DE program language based on components, and the three-dimensional model can be dynamically modified and automatically updated because the three-dimensional model is completely associated with data of the data table, for example, as shown in FIG. 15, single line diagram circular-to-square design data is modified into circular-to-city gate design data, and the model is updated by parameter driving.
In addition, when the above embodiment is used, the process of establishing the fully parameterized three-dimensional model of the elbow-shaped draft tube, as shown in fig. 1, includes the following steps:
s1) establishing a draft tube input shaft system;
s2) numbering the current single line diagram of the 1 st behavior of the single line diagram data table;
s3) establishing a current numbered section single line diagram component;
s4) if the last line of the single line diagram data table is available, the step S5) is carried out, otherwise, the next line is the current single line diagram number, and the step S3) is returned;
s5) fitting the central points of all the single line diagrams to generate a central axis;
s6) setting a 1 st single line diagram as a front single line diagram and a 2 nd single line diagram as a current single line diagram;
s7) building a solid segment assembly;
s8) if the current single line diagram is the last one, entering the step S9), otherwise, setting the current single line diagram as the previous single line diagram and the next single line diagram as the current single line diagram, and returning to the step S7);
and S9) generating a draft tube integral entity model by Boolean combination operation.
The elbow-shaped draft tube full-parametric three-dimensional modeling method takes the experimental parameters of a design table containing the positioning and section size parameters of each section as input, refines and upgrades the method for generating the three-dimensional model by single line diagram lofting, realizes the full-parametric three-dimensional modeling of the draft tube, and can quickly establish and dynamically modify the draft tube three-dimensional model; because the three-dimensional model is completely associated with the input parameters, the model can be dynamically modified and automatically updated along with the parameters, and the time for designing, modeling, modifying and updating the draft tube is shortened; in addition, the elbow-shaped draft tube gradually deforms in a streamline manner, the model adopts a single line diagram and a node coupling uniform transition lofting method, the consistency of the draft tube runner solid model and a real runner body is guaranteed, and the accuracy and the reliability of structural calculation analysis are guaranteed.
Claims (4)
1. A full-parametric three-dimensional modeling method for an elbow-shaped draft tube is characterized by comprising the following steps: the method comprises the following steps:
1) Establishing a draft tube input shaft system, wherein the shaft system is a right-hand system, the origin of the shaft system is the central point of the bottom surface of a conical pipe section of the elbow-shaped draft tube, the Y axis of the shaft system is the negative elevation direction of the central line of the unit, and the X axis of the shaft system is the following water flow direction;
2) Establishing a cross-section single line diagram component, wherein an input element is a draft tube input shafting, input parameters are a single line diagram data sheet and a single line diagram number, outputting a cross-section single line outline, 8 coupling points and 1 central point, wherein the 8 coupling points are used for node coupling of adjacent single line diagrams, and the single line diagram component establishment process is as follows:
2a) Establishing a single line diagram plane local coordinate system, wherein the axis system is a right-hand system, the connecting line direction of a single line diagram locating point a (xa, ya, 0) and a locating point i (xi, yi, 0) is the V axial direction of the plane local axis, the middle point of the connecting line is the origin, and the U axial direction of the plane local axis is parallel to the Z axis of the draft tube input axis system;
2b) Establishing a single-line diagram outline in a plane local coordinate system according to the single-line diagram size parameter;
2c) The method comprises the following steps of axially establishing 8 coupling points on the outline of a single line diagram by a plane local coordinate system UV;
2d) Packaging the steps and establishing a single line diagram component;
3) Fitting and generating a central axis by using central points of all the single line graphs;
4) Taking the central axis of the draft tube as a ridge line, correspondingly coupling and lofting two adjacent single line diagrams according to the number of coupling points, establishing a segmented entity assembly, inputting two adjacent single line diagrams and the central axis of the draft tube as elements, and outputting a segmented entity;
5) And generating a draft tube integral entity model by performing Boolean combination operation on all the segmented entities.
2. The elbow draft tube full-parametric three-dimensional modeling method according to claim 1, wherein: in the step 2), 8 coupling points are established by the single line diagram component, so that adjacent single line diagram profiles are correspondingly coupled according to the number of the coupling points, the coupling point 1 is a point with the largest V direction and the smallest U direction on the profile, the coupling point 2 is a point with the largest V direction and the largest U direction on the profile, the coupling point 3 is a point with the largest U direction and the largest V direction on the profile, the coupling point 4 is a point with the largest U direction and the smallest V direction on the profile, the coupling point 5 is a point with the smallest V direction and the largest U direction on the profile, the coupling point 6 is a point with the smallest V direction and the smallest U direction on the profile, the coupling point 7 is a point with the smallest U direction and the smallest V direction, and the coupling point 8 is a point with the smallest U direction and the largest V direction.
3. The elbow draft tube full-parametric three-dimensional modeling method according to claim 2, wherein: in the step 2), the single line diagram with the geometric figure of at most 8 nodes and less than 8 nodes has the condition that 2 coupling points exist in the same node, namely the coupling points coincide, but the coincidence of 3 or more coupling points does not occur.
4. The fully parameterized three-dimensional modeling method for the elbow draft tube according to claim 2 or 3, characterized in that: in the step 4), the coupling of the nodes of the adjacent single line diagrams is subdivided into 8 types of coupling relations, so that the automatic corresponding coupling of the nodes on the adjacent single line diagrams is realized:
class 1: the contour coupling points of the adjacent 2 single line diagrams are not overlapped or the numbers of the overlapped coupling points are not corresponding at all, namely under the condition that the coupling relation lines of the 8 corresponding coupling points are not overlapped, establishing a draft tube subsection entity according to the 8 coupling relation lines;
class 2: only 1 pair of coincident coupling points with consistent serial numbers are formed, namely 1 pair of coincidence exists in 8 coupling relation lines, and when the 1 st coupling point is coincident with the 2 nd coupling point, a draft tube subsection entity is established according to 7 coupling relation lines;
class 3: 1 pair of 8 coupling relation lines are overlapped, and when the 5 th coupling relation line is overlapped with the 6 th coupling relation line, a draft tube subsection entity is established according to the 7 coupling relation lines;
class 4: only 2 pairs of coincident coupling points with consistent serial numbers are obtained, namely 2 of 8 coupling relation lines are coincident, and when the 1 st coupling relation line is coincident with the 2 nd coupling relation line and the 5 th coupling relation line is coincident with the 6 th coupling relation line, a draft tube subsection entity is established according to the 6 coupling relation lines;
class 5: 2 of the 8 coupling relation lines are overlapped, and when the 3 rd and the 4 th coupling relation lines are overlapped, and the 7 th and the 8 th coupling relation lines are overlapped, a draft tube subsection entity is established according to the 6 coupling relation lines;
class 6: only 3 pairs of coincident coupling points with consistent serial numbers are obtained, namely 3 of 8 coupling relation lines are coincident, and when the 1 st coupling line is coincident with the 2 nd coupling line, the 3 rd coupling line is coincident with the 4 th coupling line, and the 7 th coupling line is coincident with the 8 th coupling line, a draft tube subsection entity is established according to the relation of the 5 coupling lines;
class 7: 3 pairs of 8 coupling relationship lines are overlapped, and when the 3 rd line is overlapped with the 4 th line, the 5 th line is overlapped with the 6 th line, and the 7 th line is overlapped with the 8 th line, a draft tube subsection entity is established according to the 5 coupling relationship lines;
class 8: there are 4 pairs of coincident coupling points with identical serial numbers, namely 4 coincident coupling points in 8 coupling relation lines, the outlines of the two single line diagrams are both circles or both rectangles, the outlines of the two single line diagrams are similar, the geometric nodes completely correspond to the two single line diagrams, the geometric nodes of the single line diagrams are correspondingly coupled, and a draft tube subsection entity is established.
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