A digital modeling method for refined tower model

Abstract

The invention discloses a digital modeling method for a refined model of an iron tower, relates to the technical field of iron tower modeling, and specifically comprises the following steps: a): extracting component and node attribute information of an iron tower from a calculation model file; and building a single-line model of the iron tower, and assigning the single-line model component and node attribute information; b): abstracting the composition principle of the nodes and components of the iron tower into a mathematical model according to the structural characteristics, and establishing an extensible standard node construction library; c): calling the standard node construction library in step b, and loading the node model in the standard node construction library onto the component and node of the single-line model built in step a; d): completing three-dimensional modeling according to the single-line model with the node model loaded in step c; the invention can quickly realize the refined modeling of the iron tower, thereby greatly improving the efficiency and accuracy of the refined modeling of the iron tower.

Description

Technical Field

[0001] The invention relates to the technical field of iron tower modeling, and in particular to a digital modeling method for an iron tower refined model. Background Art

[0002] The refined model of the tower contains high-precision processing and layout information of all parts, which can easily view detailed dimensional parameters and material tables, and can also be used directly for processing; the current modeling process is to generate a tower geometric model based on the tower structure drawing, and then enter the components one by one in the geometric model so that the single line has component properties, and draw node plates and configure bolts according to the construction requirements in the drawing, and use computer graphics technology to express the plane geometric information of the components with three-dimensional graphics to form a complete three-dimensional model; part drawings can be extracted from the three-dimensional model and transmitted to CNC machine tools to complete the processing of the components; the advantage of this method is that it realizes the connection between design drawings and processing, and the problems existing in the processing process can be fed back to the design unit for adjustment in the later stage; the disadvantage is that the cycle from tower design to processing modeling is relatively long, ranging from 1 month at the shortest and 3 months to half a year at the longest; and domestic processing manufacturers generally use special layout software, and the data with the design unit cannot be interoperable, which cannot meet the needs of full life cycle management of transmission lines. Summary of the invention

[0003] The purpose of the present invention is to: aim at the problem that the current modeling of the refined model of the iron tower has a long period from the iron tower design to the processing modeling, which is as short as 1 month and as long as 3 months to half a year; and the domestic processing manufacturers generally use special lofting software, which cannot achieve intercommunication with the design unit data and cannot meet the needs of the full life cycle management of the power transmission line. The idea of ​​abstracting the physical components and nodes into mathematical models with attributes is introduced into the modeling process, and a digital modeling method for the refined model of the iron tower is provided, which shortens the modeling time, achieves the intercommunication from the design data to the processing data, and solves the above problems.

[0004] The technical solution of the present invention is as follows:

[0005] A digital modeling method for a tower refined model comprises the following steps:

[0006] a): Extract the component and node attribute information of the tower from the calculation model file; build a single-line model of the tower, and assign the component and node attribute information of the single-line model;

[0007] b): According to the structural characteristics, the composition principles of the tower's nodes and components are abstracted into mathematical models, and an extensible standard node construction library is established;

[0008] c): Call the standard node construction library in step b, and load the node model in the standard node construction library into the components and nodes of the single-line model constructed in step a;

[0009] d): Complete the three-dimensional modeling based on the single-line model of the node model loaded in step c.

[0010] Furthermore, the node attribute information in step a includes node position, connecting components, and coordinates; the component attribute information includes component endpoints, length, and material attribute information.

[0011] Furthermore, the detailed steps of step b are:

[0012] b1: Select each node in the tower model and read the location, coordinates, symmetry and functional characteristics of each node;

[0013] b2: Based on the information read in step b1, draw a mathematical model and determine the main variables.

[0014] Furthermore, the detailed steps of step c are:

[0015] c1: The mathematical model in step b is used according to the computer model matching principle to index the node model with the same design conditions from the standard node construction library;

[0016] c2: Load the indexed node model to the corresponding nodes and components in the single-line model built in step a.

[0017] Furthermore, the main variables include: base point, main rod, secondary rod, connecting bolts, accessories, connection relationship between main rod and secondary rod, overlap relationship between main rod and secondary rod and accessories, bolt arrangement, number of bolts, shape and position of accessories.

[0018] Furthermore, the computer model matching principles include: direct matching, indirect matching and intervention matching.

[0019] Furthermore, the direct matching is to maintain the direct correspondence between the attribute information, the main variables and the values. The main variables are not selective and form a unique and corresponding rule with the values. The data structure is a linear structure.

[0020] Furthermore, the indirect matching is a multiple-choice correspondence relationship between attribute information, main variables and values, and its data structure is a tree type.

[0021] Furthermore, the intervention matching is a many-to-many correspondence between attribute information and main variables and values, that is, the attribute information is variable, the main variables and values ​​are also variable, and its data structure is a graph structure.

[0022] Furthermore, in the step c1, when a node model with the same design condition is not indexed, a node model of the node is actively constructed, and the node model is added to a standard node construction library to expand the standard node construction library.

[0023] The beneficial effects of the present invention compared with the existing technology are as follows:

[0024] 1. A digital modeling method for a refined model of a steel tower, comprising the following steps: First, extract the component and node attribute information of the steel tower from the computational model file; and build a single-line model with component and node attribute information; then abstract the composition principles of the nodes and components of the steel tower into a mathematical model according to the construction features, and establish an extensible standard node construction library; further, load the node models in the standard node construction library onto the components and nodes of the single-line model built in step a, and finally complete the three-dimensional modeling through program driving; the refined modeling of the steel tower can be quickly realized, thereby greatly improving the efficiency and accuracy of the refined model modeling of the steel tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a flow chart of a digital modeling method for a refined model of a steel tower;

[0026] Figure 2 is a schematic diagram of a node in the computational model file;

[0027] Figure 3 is an example of a node mathematical model of a cross diagonal member;

[0028] Figure 4 is a schematic diagram of a wine glass tower computational model and node positions;

[0029] Figure 5 Schematic diagram of a dry-type tension tower computational model and node positions. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] It should be noted that relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0031] The features and performance of the present invention will be further described in detail below in conjunction with the embodiments.

[0032] Embodiment 1

[0033] Since the refined model of the transmission tower has been maturely applied in the field of tower processing, it provides the necessary basic conditions for the application of digital modeling; the conventional modeling process of the refined model of the tower is:

[0034] (1) Tower calculation, forming tower command diagram, tower calculation report and other results;

[0035] (2) Draw a two-dimensional structural diagram of the tower, i.e., a blueprint for construction and processing;

[0036] (3) Create a geometric model of the tower in the software based on the tower structure drawing, then enter the components one by one in the geometric model so that the single line has component properties, draw the node plate and configure the bolts according to the construction requirements in the drawing, and use computer graphics technology to express the plane geometric information of the components with three-dimensional graphics to form a complete three-dimensional model.

[0037] (4) Part drawings can be extracted from the 3D model and transmitted to CNC machine tools to complete component processing.

[0038] The above modeling method is based on the completed drawings, that is, the existing drawings are re-modeled, which takes a long time. Moreover, the model is created in the processing stage and is not connected with the calculation model in the design stage. The data is not connected and the full process application of the digital model cannot be realized.

[0039] The digital modeling method proposed in the present invention is to establish a three-dimensional model directly based on the tower calculation results. The main process is:

[0040] (1) Tower calculation, forming tower command diagram, tower calculation report and other results;

[0041] (2) Create a tower geometry model in the software based on the calculation results, then enter the components one by one in the geometry model so that the single line has component attributes, draw the node plate and configure the bolts according to the construction requirements in the drawing, and use computer graphics technology to express the plane geometry information of the components with three-dimensional graphics to form a complete three-dimensional model;

[0042] (3) Cutting a two-dimensional structural diagram from the three-dimensional model, i.e., the blueprint used for construction and processing;

[0043] (4) Part drawings can be extracted from the 3D model and transmitted to CNC machine tools to complete component processing.

[0044] The digital modeling method avoids the step of drawing a two-dimensional structural diagram first, but instead cuts the drawings from the three-dimensional model and modifies the drawings through the linkage between the model and the drawings.

[0045] Specifically, see Figure 1-5 A digital modeling method for a tower refinement model comprises the following steps:

[0046] a): extracting the component and node attribute information of the tower from the calculation model file; building a single-line model of the tower, and assigning the component and node attribute information to the single-line model; the single-line model is automatically generated by the three-dimensional modeling platform based on the extracted component and node attribute information;

[0047] b): According to the structural characteristics, the composition principles of the nodes and components of the iron tower are abstracted into mathematical models, and an extensible standard node construction library is established; the standard node construction library is pre-built in the three-dimensional modeling platform, can be directly called by the three-dimensional modeling platform, and the standard node construction library is extensible; a large number of node models (i.e., node types) are stored in the standard node library, and the standard node construction library is formed by collecting and arranging the node types in an enumerated manner; the three-dimensional modeling platform is embedded with intelligent driving rules of the iron tower composition mathematical model;

[0048] c): Call the standard node construction library in step b, and load the node model in the standard node construction library into the components and nodes of the single-line model constructed in step a;

[0049] d): According to the single-line model of the node model loaded in step c, the three-dimensional modeling is completed; the completion of the three-dimensional modeling is also automatically generated by a computer in the three-dimensional modeling platform.

[0050] The node attribute information in step a includes node position, connection components, and coordinates; the component attribute information includes component endpoints, length, and material attribute information; the node attribute information and component attribute information include but are not limited to the above content; the definition of the component attribute information in the calculation model file is shown in Table 1, and the components of the tower calculation model file include main materials, oblique materials, partition materials, leg oblique materials, combined angle steels, etc.; Table 2 is an example of component attribute information; Figure 2 It is a node diagram in the calculation model file, from which the node number, node coordinates, number of related connected components and component attribute information can be obtained.

[0051] Table 1 Tower calculation model file component attribute information table

[0052]

[0053] Table 2 Example of component attribute information in calculation model file

[0054]

[0055]

[0056] The detailed steps of step b are:

[0057] b1: Select each node in the tower model and read the location, coordinates, symmetry and functional characteristics of each node; Figure 4 and Figure 5 They are the calculation model and node location diagram of wine glass tower and the calculation model and node location diagram of dry-shaped tension tower respectively;

[0058] b2: Draw a mathematical model based on the information read in step b1 and determine the main variables; Figure 3 This is an example of the mathematical model of the node of the cross-diagonal material; as can be seen from the figure, the cross node is composed of rays 1, 2, and 3 (optional), and n1 and n2 represent the number of bolts at both ends of the member.

[0059] The detailed steps of step c are:

[0060] c1: The mathematical model in step b is indexed from the standard node construction library according to the computer model matching principle to find the node model with the same design conditions; the design conditions refer to the specific values ​​of the main variables, and the indexing is performed according to the principle of numerical matching;

[0061] c2: Load the indexed node model to the corresponding nodes and components in the single-line model constructed in step a; then the 3D modeling platform automatically generates a 3D model, thus completing the model establishment.

[0062] The main variables include: base point, main member, secondary member, connecting bolts, accessories, connection relationship between main member and secondary member, overlap relationship between main member and secondary member and accessories, bolt arrangement, number of bolts, shape and position of accessories; the bolt arrangement is determined according to the overlap relationship between main member and secondary member and accessories; the shape and position of accessories are determined according to the bolt arrangement; Figure 3 Among them, rays 1 and 2 are main rods, and ray 3 is a secondary rod, which is directly overlapped on the main rod 1 and the main rod 2 or overlapped on the main rod 1 and the main rod 2 through a connecting plate.

[0063] Step 24, determine the bolt arrangement and the number of bolts according to the overlap relationship, collect and organize the node types by enumeration, and form an expandable node library; it is also possible to determine whether there is a connection plate, as well as the shape and position of the connection plate according to the bolt arrangement result. The shape of the connection plate is generally drawn according to the principle of combining the envelope line and the bolt end distance. Table 3 is a node library constructed by the refined model corresponding to the mathematical model of the cross node:

[0064] Table 3 Refined model construction node library corresponding to the cross node mathematical model

[0065]

[0066] The setting rules for the arrangement and quantity of cross node bolts are determined according to the following conditions:

[0067] A. Tower cross nodes without braces or hangers (such as types 1 and 2 in Table 3)

[0068] The bolts selected at the intersection should be consistent with the bolt specifications at both ends of the cross diagonal material.

[0069] For angle steel with leg width less than 180, one bolt is used for the cross node;

[0070] For angle steel with leg width ≥180, two bolts are used at the cross node.

[0071] B. Tower cross nodes with braces or hangers (such as types 3 and 4 in Table 3)

[0072] For angle steel with cross diagonal limb width ≤110, M16 bolts are used at the intersection;

[0073] For angle steel with cross diagonal limb width > 110, M20 bolts are used at the intersection;

[0074] For angle steel with cross diagonal limb width ≥180, there shall be no less than two bolts at the intersection and it shall be connected with the brace or hanger by plate.

[0075] C. Tower cross nodes with transverse auxiliary materials (as shown in Table 3, Type 5)

[0076] For angle steel with cross diagonal limb width ≤110, M16 bolts are used at the intersection;

[0077] For angle steel with cross diagonal limb width > 110, M20 bolts are used at the intersection;

[0078] For angle steel with cross diagonal limb width ≥180, there shall be no less than two bolts at the intersection and it shall be connected with the brace or hanger by plate.

[0079] Computer model matching principles include: direct matching, indirect matching and intervention matching.

[0080] Direct matching is to maintain the direct correspondence between attribute information, main variables and numerical values. The main variables are not selective and form unique and corresponding rules with the numerical values. Its data structure is a linear structure; that is, if there is a unique node model with the same design conditions as the node in the standard node construction library, direct matching can be performed without manual interference.

[0081] Indirect matching is a multiple-choice correspondence between attribute information and main variables and values, and its data structure is a tree type; that is, if there are node models in the node construction library that have the same design conditions as the node but are not unique, it is necessary to manually select a more appropriate node model.

[0082] Intervention matching means that there is a many-to-many correspondence between attribute information and main variables and values, that is, the attribute information is changeable, the main variables and values ​​are also changeable, and its data structure is a graph structure; that is, if the node model with the same design conditions as the node cannot be indexed in the node construction library, a new node model needs to be manually created and added to the node construction library to expand the node construction library.

[0083] Indirect matching, that is, when there are multiple types of node structures corresponding to the mathematical model in the standard node structure library, the appropriate node model should be manually selected from the standard node structure library in combination with classification; the specific method is:

[0084] (1) Construction of standard node structure library: various typical nodes are stored in the system in the form of templates; the main categories of the standard node structure library are shown in Table 4.

[0085] Table 4 Main categories of standard node construction library

[0086] Node Type mark Cross Node JC Connect K node with main material ZK Cross arm and tower connection node HD Ground wire bracket connection node DX Diaphragm node HG K-node on diaphragm HK Tower Leg K Node TK Tower leg V-face node TV Main material joint node JT Straight tower hanging point ZG Tension tower hanging point JG Other nodes QT

[0087] (2) The program retrieves the corresponding node model under the corresponding category from the standard node construction library according to the component specifications and positional relationship at the node of the single-line model, and generates a node type at the corresponding position under the single-line model. When there are multiple types in the node library, the user is prompted to select a type independently.

[0088] Intervention matching, that is, when encountering special construction requirements and the corresponding node type does not exist in the standard node construction library, it is completed through manual intervention. The specific method is: the user selects the node position and the connected rods in the interactive interface; inputs the number of bolts, arrangement method, and negative end distance of the rods in turn; determines the outer contour size of the node plate; and completes the node modeling.

[0089] For more complex node types, such as tower base plates, users are required to input information such as tower base plate width, thickness, material, size and spacing of anchor bolts, and tower hanging points, users are required to input hanging point form, angle steel specifications, hanging hole size, and other information.

[0090] In step c1, when a node model with the same design conditions is not indexed, a node model of the node is manually constructed, and the node model is added to a standard node construction library to expand the standard node construction library.

[0091] The intelligent driving rules of the tower composition mathematical model embedded in the 3D modeling platform specifically include: control size, composition line, composition method, angle steel specification library, angle steel line library, tension angle steel special line, bolt specification library, bolt spacing library, foot nail library, washer library, pre-arch requirements, joint accessories library, etc.; the above rules are not selective, and form a unique and corresponding rule with the numerical value, which can be determined by simply filling in the numerical value; the specific method is:

[0092] (1) Select the type of drawing rule, such as composition guideline setting;

[0093] (2) According to the component specifications used in this tower, set the reference line and manually fill in the values ​​to complete the setting.

[0094] (3) Other mapping rules are handled in the same way as (1) and (2).

[0095] Embodiment 2

[0096] Example 2 takes an 800kV DC straight tower as an example, and compares the design cycle using traditional modeling and digital modeling methods. The comparison results are shown in Table 5:

[0097] Table 5 Comparison of traditional modeling and digital modeling in the design cycle

[0098]

[0099] It can be seen from Table 5 that the total number of man-days using digital modeling is reduced by 41% compared with traditional modeling.

[0100] The above-mentioned embodiments only express the specific implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the protection scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the technical solution concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A digital modeling method for a tower refined model, characterized in that: The steps include: a): Extract the component and node attribute information of the tower from the calculation model file; build a single-line model of the tower, and assign the component and node attribute information to the single-line model; b): According to the structural characteristics, the composition principles of the tower's nodes and components are abstracted into mathematical models, and an extensible standard node construction library is established; c): Call the standard node construction library in step b, and load the node model in the standard node construction library into the components and nodes of the single-line model built in step a; d): Complete the three-dimensional modeling according to the single-line model of the node model loaded in step c; The detailed steps of step b are: b1: Select each node in the tower model and read the location, coordinates, symmetry and functional characteristics of each node; b2: Draw a mathematical model based on the information read in step b1 and determine the main variables; The detailed steps of step c are: c1: The mathematical model in step b is used according to the computer model matching principle to index the node model with the same design conditions from the standard node construction library; c2: Load the indexed node model to the corresponding nodes and components in the single-line model built in step a; The main variables include: base point, main member, secondary member, connecting bolts, accessories, connection relationship between main member and secondary member, overlap relationship between main member and secondary member and accessories, bolt arrangement, bolt quantity, shape and position of accessories; The computer model matching principles include: direct matching, indirect matching and intervention matching; The direct matching is to maintain the direct correspondence between the attribute information, the main variables and the values. The main variables are not selective and form a unique and corresponding rule with the values. The data structure is a linear structure. The indirect matching is a multiple-choice correspondence between attribute information, main variables and values, and its data structure is a tree type; The intervention matching is a many-to-many correspondence between attribute information and main variables and values, that is, the attribute information is variable, the main variables and values ​​are also variable, and its data structure is a graph structure; In the step c1, when no node model with the same design condition is indexed, a node model of the node is actively constructed, and the node model is added to a standard node construction library to expand the standard node construction library; The direct matching rule is: if there is a unique node model with the same design conditions as the node in the standard node construction library, direct matching can be performed so that the node model directly matches the node without manual interference; The rules for indirect matching are as follows: (1) Construction of standard node structure library: storing various typical nodes in the system in the form of templates; (2) According to the component specifications and positional relationships at the nodes of the single-line model, the corresponding node model under the corresponding classification is retrieved from the standard node construction library, and the node type is generated at the corresponding position under the single-line model; when there are multiple types in the node library, the user is prompted to select a type independently; The rule for the intervention matching is: if the node construction library fails to index a node model with the same design conditions as the node, a new node model needs to be manually created and added to the node construction library to expand the node construction library.

2. The method for digital modeling of a tower refined model according to claim 1 is characterized in that: The node attribute information in step a includes node position, connecting components, and coordinates; the component attribute information includes component endpoints, length, and material attribute information.

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