Parameterization efficient modeling method for power transmission tower

Abstract

The invention provides a power transmission tower parameterization efficient modeling method, and belongs to the technical field of tower modeling, and the method comprises the following steps: S1, decomposing a tower structure into a tower leg module, a tower body module and a tower head module, and summarizing the typical structure type of each module; s2, extracting basic characteristic parameters of each module of the tower, generating nodes and connecting units, and establishing a geometric model of a typical structure of each module; s3, performing material section assignment on the geometric model rod piece group of each module of the tower; and S4, assembling the modules to generate a tower finite element model. According to the method, the C + + programming language, the visual toolkit VTK and the graphical user interface application program development framework Qt are combined, the purpose of modifying the basic geometric characteristic parameters of the tower to achieve rapid modeling is achieved, the problem that modeling of the transmission tower is complex in engineering is solved, the modeling workload is reduced, and meanwhile the model precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of pole tower modeling, and in particular to a parameterized and efficient modeling method for a transmission pole tower. Background Art

[0002] The transmission towers in the transmission lines keep the transmission lines at a certain height from the ground, ensuring that the transmission lines can safely, stably and efficiently transmit electric energy to the user terminals. Although various factors are taken into consideration in the design of transmission towers, the ability of transmission towers to resist deformation will gradually weaken under the continuous influence of environmental erosion, material aging and long-term loads. In this case, once encountering strong winds accompanied by typhoon weather and ice cover during ice disaster weather, the load on the towers will exceed their own safety limits and the towers will collapse.

[0003] Due to the various types and specifications of transmission towers in China, the use of commercial finite element simulation software to model the structure of the same series of transmission towers requires a lot of manpower and material resources, a long work cycle and low work efficiency. Therefore, in order to reduce this tediousness, a parametric finite element modeling method of towers based on digital grid is proposed to optimize the modeling process of transmission towers, which has practical engineering significance for the design and safe operation of transmission lines. Summary of the invention

[0004] In view of this, the present invention aims at the deficiencies in the prior art and provides a parameterized and efficient modeling method for transmission towers.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a parameterized and efficient modeling method for transmission towers, comprising the following steps:

[0006] S1. Decompose the tower structure into three modules: tower legs, tower body and tower head, and summarize the typical structural type of each module;

[0007] S2, extract the basic characteristic parameters of each tower module, generate nodes and connection units, and establish a geometric model of the typical structure of each module;

[0008] S3, assigning material sections to the geometric model bar groups of each module of the tower;

[0009] S4. Assemble the modules to generate a finite element model of the tower.

[0010] Furthermore, in S1, the tower leg part is divided into four independent units according to the quadrant, and each unit is a triangular pyramid; the tower body is a quadrangular pyramid as a whole, and is divided into multiple small quadrangular pyramid units according to each internode; the tower head part is decomposed into multiple basic modules according to the structure to obtain basic elements, and then spatial changes and set operations are performed on the basic elements.

[0011] Furthermore, in S2, basic characteristic parameters of the tower legs, tower body and tower head are extracted, and the key node coordinates of the typical structure of each module are generated using the basic characteristic parameters.

[0012] Furthermore, according to the collinear relationship of the nodes in the tower, the coordinate calculation formula of the kth n equally divided point in the space segment composed of the key node (x1, y1, z1) and the point (x2, y2, z2) is extracted as follows:

[0013]

[0014] Furthermore, according to the design drawings, typical structural members of each module of the tower are accurately connected through node numbering, and further assembled into a complete tower head, tower body and tower head module; the direction of the beam unit is defined by default according to the coordinates of the two nodes of the unit; at the same time, the units with the same material cross-section in the structure are grouped together, and the unit adds the member group number.

[0015] Furthermore, in S3, a material section library is generated by customizing, and material sections are assigned to each module unit member group of the tower head, tower body and tower leg.

[0016] Further, in S4, a tower head, a tower body and a tower head module are selected and assembled to generate a target tower model.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) In the technical solution provided by the present invention, a complex tower geometric model can be efficiently constructed using a small number of parameters, which solves the problem of cumbersome and difficult modeling pre-processing in engineering practice and enhances the accuracy and reliability of the tower model.

[0019] (2) In the technical solution provided by the present invention, when generating a pole tower model, the unit direction of the pole member is defined by default according to the unit node coordinates, and there is no need to additionally define the unit direction, thereby reducing the modeling workload.

[0020] (3) In the technical solution provided by the present invention, the concept of "rod group" is introduced, which eliminates the need to assign a cross section to each rod one by one, optimizes the operation steps of assigning material cross sections to units, and improves the modeling efficiency of the finite element model of the tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a method flow chart of an embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of basic characteristic parameters and structure of tower legs in an embodiment of the present invention;

[0023] Figure 3 Schematic diagram of the geometric model of the tower leg of the pole tower in the embodiment of the present invention;

[0024] Figure 4 It is a schematic diagram of basic characteristic parameters and structure of the tower body in an embodiment of the present invention;

[0025] Figure 5 Schematic diagram of the geometric model of the tower body in an embodiment of the present invention;

[0026] Figure 6 It is a schematic diagram of basic characteristic parameters and structure of a cross arm in an embodiment of the present invention;

[0027] Figure 7 It is a schematic diagram of basic characteristic parameters and structure of the ground wire support in an embodiment of the present invention;

[0028] Figure 8 Schematic diagram of the geometric model of the tower head in the embodiment of the present invention;

[0029] Fig. 9 2 is a schematic diagram showing the completion of the assignment of material sections of tower modules in an embodiment of the present invention;

[0030] Fig.10 It is a parametric finite element model diagram of a tower in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0032] Example: Refer to Figure 1 The present invention provides a tower parametric finite element modeling method based on digital grid, which specifically includes the following steps:

[0033] Step (1), decomposing the tower structure into three modules: tower legs, tower body, and tower head, and summarizing the typical structural type of each module;

[0034] Step (2), extracting basic characteristic parameters of each tower module, generating nodes and connection units, and establishing a geometric model of a typical structure of each module;

[0035] Step (3), assigning material sections to the geometric model bar groups of each module of the tower;

[0036] Step (4), assembling the modules to generate a finite element model of the tower.

[0037] Specifically, in step (1), the tower leg part is divided into four independent units according to the quadrant, and each unit is a triangular pyramid; the tower body part is a quadrangular pyramid as a whole, and is divided into multiple small quadrangular pyramid units according to each internode; the tower head part is decomposed into multiple basic modules according to the structure to obtain basic elements, and then spatial changes and set operations are performed on the basic elements.

[0038] In step (2), the basic characteristic parameters of the tower legs, tower body and tower head are extracted, and the key node coordinates of the typical structure of each module are generated using the basic characteristic parameters.

[0039] According to the collinear relationship of the nodes in the tower, the coordinate calculation formula of the kth n equally divided point in the space segment composed of the key node (x1, y1, z1) and the point (x2, y2, z2) is as follows:

[0040]

[0041] According to the design drawings, typical structural members of each module of the tower are accurately connected through node numbering, and further assembled into a complete tower head, tower body and tower head module; the direction of the beam unit is defined by default according to the coordinates of the two nodes of the unit; at the same time, the units with the same material cross-section in the structure are grouped together, and the unit adds the member group number.

[0042] In step (3), a custom material section library is generated, and material sections are assigned to each module unit member group of the tower head, tower body and tower leg.

[0043] In step (4), a tower head, a tower body and a tower head module are selected and assembled to generate a target tower model.

[0044] Taking a tower as an example, the tower is first decomposed into tower legs, tower body and tower head, the basic characteristic parameters of each module are extracted, and the geometric model of the typical structure of each module is established. Figure 2 The following are the basic characteristic parameters of the tower leg and the tower leg structure of the target tower. The tower leg parameters are L1 = 18.24m, L2 = 15.16m, h1 = 14m. The triangular pyramid model nodes of a single quadrant of the tower leg are generated using the parameters and node interpolation formula. The nodes are connected according to the design drawings to generate a single quadrant tower leg model. The remaining three quadrant nodes are generated by modifying the coordinate symbols of the single quadrant nodes through C++ programming and adding them to obtain the target tower leg geometric model as shown below: Figure 3 shown. Figure 4 The following are the basic characteristic parameters of the tower body and the structure of the target tower body. The tower body parameters w1 = 15.16m, w2 = 4.6m, and hi values ​​are shown in Table 1. The tower body is divided into multiple quadrangular pyramids. Each internode is generated by using parameters and geometric relationships. The units are connected and assembled to generate the target tower body geometry model as shown in Figure 1. Figure 5The tower head is composed of a ground wire support and a cross arm. The basic characteristic parameters of the two are slightly different. The tower head is further divided into three parts: the bottom surface, the top surface and the side surface. Figure 6 , Figure 7 The following table shows the basic characteristic parameters and target structure of the cross arm and ground wire support. The top surface of the cross arm is w1 = 2.439m, w2 = 1.287m, the bottom surface is w3 = 2.579m, w4 = 1.292m, the side surface is h1 = 2m, h2 = 0.5m, and the segment length li is shown in Table 2. The top surface of the ground wire support is w1 = 2.3m, w2 = 2.439, w3 = 1.3m, and the segment length li = 1.716. The nodes of each section of each part are generated according to the parameters, and the connection units are spliced ​​and assembled to generate the target tower head geometry model as shown in Figure 8 shown.

[0045] Table 1 Tower internode height h i Value

[0046]

[0047] Table 2 Cross arm side section length l i Value

[0048]

[0049] After the geometric model is generated, it is necessary to further assign material sections to the model. The concept of "rod group" is introduced in the pole tower module. In the process of building each module of the pole tower, the units with the same material section in the module are grouped into a group to form a rod group, thereby realizing the rapid assignment of sections. Taking the tower leg module as an example, the tower leg material is Q345, the main material angle steel section is L220*24, the diagonal brace angle steel section is L160*14, and the other auxiliary material angle steel sections are L140*12, L125*10 and L50*4. The tower leg material section assignment is completed as follows: Fig. 9 shown.

[0050] After the material section assignment of the target tower module is completed, the target tower parametric finite element model can be assembled and generated, such as Fig.10 shown.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art can still modify or make equivalent substitutions to the specific implementations of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention are within the scope of protection of the claims of the present invention to be approved.

Claims

1. A method for efficient parameterized modeling of transmission towers, characterized in that: The following steps are involved: S1. Decompose the tower structure into three modules: tower legs, tower body and tower head, and summarize the typical structural type of each module; S2, extract the basic characteristic parameters of each tower module, generate nodes and connection units, and establish a geometric model of the typical structure of each module; S3, assigning material sections to the geometric model bar groups of each module of the tower; S4. Assemble the modules to generate a finite element model of the tower.

2. The method for efficient parameterized modeling of transmission towers according to claim 1, characterized in that: In S1, the tower legs are divided into four independent units according to the quadrants, and each unit is a triangular pyramid; the tower body is a quadrangular pyramid as a whole, which is divided into multiple small quadrangular pyramid units according to each internode; the tower head is decomposed into multiple basic modules according to the structure to obtain basic elements, and then spatial changes and set operations are performed on the basic elements.

3. The method for efficient parameterized modeling of transmission towers according to claim 1, characterized in that: In S2, the basic characteristic parameters of the tower legs, tower body and tower head are extracted, and the key node coordinates of the typical structure of each module are generated using the basic characteristic parameters.

4. The method for efficient parameterized modeling of transmission towers according to claim 3 is characterized in that: According to the collinear relationship of the nodes in the tower, the coordinate calculation formula of the kth n equally divided point in the space segment composed of the key node (x1, y1, z1) and the point (x2, y2, z2) is as follows:

5. The method for efficient parameterized modeling of transmission towers according to claim 4 is characterized in that: According to the design drawings, typical structural members of each module of the tower are accurately connected through node numbering, and further assembled into a complete tower head, tower body and tower head module; the direction of the beam unit is defined by default according to the coordinates of the two nodes of the unit; at the same time, the units with the same material cross-section in the structure are grouped together, and the unit adds the member group number.

6. The method for efficient parameterized modeling of transmission towers according to claim 1, characterized in that: In S3, a custom material section library is generated, and material sections are assigned to each module unit member group of the tower head, tower body and tower leg.

7. The method for efficient parameterized modeling of transmission towers according to claim 1, characterized in that: In S4, the tower head, tower body and tower head module are selected and assembled to generate the target tower model.

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