CN106326504B - transmission tower space model tower material positioning method - Google Patents
transmission tower space model tower material positioning method Download PDFInfo
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- CN106326504B CN106326504B CN201510333940.7A CN201510333940A CN106326504B CN 106326504 B CN106326504 B CN 106326504B CN 201510333940 A CN201510333940 A CN 201510333940A CN 106326504 B CN106326504 B CN 106326504B
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- 239000013598 vector Substances 0.000 claims abstract description 66
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 description 12
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Abstract
The invention relates to an method for positioning tower materials of a power transmission tower spatial model, which comprises the steps of establishing a tower material section of a power transmission tower in a local coordinate system, selecting a positioning vector according to the actual placement direction of the tower materials of the power transmission tower, and positioning the tower materials of the power transmission tower in a global coordinate system according to the tower material section, the positioning vector and a vector positioning method.
Description
The technical field is as follows:
the invention relates to the field of power transmission engineering, in particular to a positioning method for space model tower materials of a power transmission tower.
Background art:
the number of the tower materials of the transmission tower is large, the cross sections of the tower materials have various forms such as angle steel and steel pipes, the arrangement direction of the cross sections of the tower materials is complex, a space model corresponding to the actual arrangement direction of the tower materials of the transmission tower structure is difficult to quickly establish, and the tower materials of the transmission tower are positioned as a main technical bottleneck for the modeling of the space model of the transmission tower.
The problem of transmission tower structure tower material location is solved, transmission tower beam unit modeling can be realized, transmission tower's finite element model uses the pole unit model to model like, the pole unit model has the characteristics that can only receive the tension and compression, can not receive the moment of flexure, and this characteristic is different with true pole tower, true pole tower still can receive the influence of moment of flexure, consequently use the beam unit to model and need consider the direction of putting of cross-section, only the location of tower material is with actual conditions basic and is met, just can obtain accurate simulation effect.
The invention content is as follows:
the invention aims to provide transmission tower space model tower material positioning methods, and solves the problem of tower material positioning of transmission tower structure.
In order to achieve the purpose, the invention adopts the following technical scheme that the transmission tower space model tower material positioning method comprises the following steps:
establishing a tower material section of the power transmission iron tower in a local coordinate system;
selecting a positioning vector according to the actual placing direction of tower materials of the power transmission iron tower;
and positioning the tower material of the power transmission iron tower in a global coordinate system according to the tower material section, the positioning vector and a vector positioning method.
In the local coordinate system, the directions of the centroid main shafts of the sections of the tower materials are respectively a y axis and a z axis; two end points of the tower material section are an i node and a j node, and the direction from the i node to the j node is the x-axis direction of the local coordinate system.
And the positioning vector selects any vectors which are not parallel to the direction of the x axis on the section of the x axis and the z axis in the coordinate system as a positioning vector vecxz.
The vector positioning method is to determine the relationship between the local coordinate system and the global coordinate system through the positioning vector, so as to determine the placing position of the tower material in the spatial global coordinate system.
Under a global coordinate system, a connecting vector of the tower material section from the node i to the node j is a vector vecx; a vector vecy of the centroid main shaft y axis of the tower material section under a global coordinate system is obtained by cross multiplication of the positioning vector vecxz and the vector vecx; and a vector vecz of the tower material section centroid main axis z axis under a global coordinate system is obtained by cross multiplication of the vector vecy and the vector vecx.
In the step: before the tower material section of the power transmission tower is established in the local coordinate system, the method further comprises the following steps:
establishing a local coordinate system and a global coordinate system;
defining node coordinates of the power transmission iron tower in a coordinate system;
and establishing a rod piece according to the connection relation between the node coordinates and the power transmission iron tower.
The local coordinate system is a space rectangular coordinate system taking the rod piece direction of the power transmission iron tower as an x axis and taking end points of the rod piece as coordinate origin points.
The process of defining the coordinates of the nodes of the power transmission towers in the coordinate system comprises the steps of establishing a power transmission tower model under a global coordinate system, defining the coordinates of the nodes on the rod pieces of all the power transmission towers under the global coordinate system, and determining the position information of all the nodes only in space.
Connecting the nodes into rod pieces according to the connection relation; two end points of the rod are determined.
Compared with the closest prior art, the technical scheme provided by the invention has the following excellent effects:
1. the technical scheme of the invention uses a vector positioning method, and utilizes a positioning vector to position the placing direction of the tower material;
2. the technical scheme of the invention has the characteristics of simple steps and easy realization;
3. according to the technical scheme, the power transmission tower materials are positioned by using fewer vectors, so that space modeling of the power transmission tower is realized;
4. according to the technical scheme, the spatial model and the actual directions of the tower materials of the tower structure of the transmission line are ensured, and meanwhile, the modeling efficiency is greatly improved;
5. according to the technical scheme, the rapid modeling of the angle steel tower space model can be realized, and the reference significance of for the construction of the transmission tower structure is realized.
Drawings
FIG. 1 is a flow chart of a method provided by the present invention;
fig. 2 is a schematic diagram illustrating coordinates of nodes defining a power transmission tower according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a rod member established according to a connection relationship of power transmission towers according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a corner steel in a local coordinate system according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of vector cross-multiplication provided by an embodiment of the present invention;
FIG. 6 is a schematic diagram of vector positioning according to an embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view of a corner steel in a local coordinate system according to an embodiment of the present invention;
fig. 8 is a schematic view of a transmission tower space model provided in an embodiment of the present invention.
Detailed Description
The invention is further illustrated in step by reference to the following examples.
Example 1:
the invention provides methods for positioning tower materials of a power transmission tower space model, as shown in figure 1, coordinates of all nodes are defined in a global coordinate system, then tower materials are established according to the connection relation of the nodes, and finally the positioning of the tower materials of the power transmission tower in the space is realized by considering the placement of the tower materials in the space. the power transmission tower uses a pole unit for modeling, the problem of the placement of the tower materials in the space is not considered, but the influence of bending moment borne by the power transmission tower cannot be considered by using the pole unit for modeling, and in order to consider the influence of the bending moment borne by the power transmission tower, the beam unit is required for modeling, and the placement direction of the tower materials is considered.
In order to solve the problem of tower material positioning of the transmission tower structure and realize rapid modeling of a transmission tower space model, the invention uses a vector positioning method to position the placing direction of the tower material of the transmission tower and realizes the conversion of the tower material section from a local coordinate system to a global coordinate system.
The steel tube section is a centrosymmetric section and is also an axisymmetric figure, the section of the steel tube rotates at any angle in a plane and the shape of the original section is , the section of the angle steel is a uniaxial symmetric figure, and the section of the angle steel rotates at fixed angle in the plane and is different from the shape of the original section.
After the two end points of the tower material of the transmission tower are determined in the space, the section of the angle steel is a uniaxial symmetrical section, so that the orientation of the angle steel cannot be determined uniquely , and the swinging direction in the space is very much possible and very complicated.
The positioning method comprises the following steps:
, establishing a global coordinate system and a local coordinate system
The global coordinate system and the local coordinate system are both space rectangular coordinate systems, the space rectangular coordinate system takes a space point O as an origin, three pairwise vertical axes are established, an x axis, a y axis and a z axis are established, a space rectangular coordinate system Oxyz is established, wherein the point O is called as the origin of coordinates, the three axes are collectively called as coordinate axes, and a plane determined by the coordinate axes is called as a coordinate plane.
The global coordinate system takes the Z axis as the vertical direction, + Z is vertical upward, the X-Y plane is a horizontal plane, and the coordinate (0,0, 0) point is the origin of coordinates.
The local coordinate system is a rectangular spatial coordinate system in which the direction of the rod is taken as the x-axis and end points of the rod are taken as the origin of coordinates.
Secondly, defining the node coordinates of the power transmission tower
As shown in figure 2, under the global coordinate system, a power transmission tower model is established, the coordinates of nodes on all rod pieces under the global coordinate system need to be defined, and only the position information of all the nodes is determined in space
After the coordinate definition of all the nodes is completed, the nodes are connected into the rod pieces according to the connection relation, at the moment, two end points of the rod pieces are determined, but the spatial arrangement of the tower material section is not determined uniquely , as shown in fig. 3.
Thirdly, establishing the tower material section under the local coordinate system
As shown in fig. 4 and 7, the cross-section of the tower is defined in the y-z plane of the local coordinate system. Taking an angle steel tower material as an example, as shown in fig. 1, the centroid principal axes of the tower material section are respectively the y axis and the z axis, and the tower material section is established under a local coordinate system.
Four, vector positioning method positioning tower material
The cross product of two vectors is vectors and the cross product of two vectors is perpendicular to the two vectors as shown in FIG. 5, VxU is vectors and is perpendicular to vector V, vector U.
After the section of the pole material of the transmission tower is defined under the local coordinate system, the relation between the local coordinate system and the global coordinate system needs to be determined through the positioning vector, and the placing position of the pole material in the space is determined.
As shown in FIG. 6, the local space coordinate system is XYZ, the global coordinate system is XYZ, in the local coordinate system, the directions of the centroid principal axes of the tower materials are respectively the y axis and the z axis, the two end points of the tower materials are the i node and the j node, and the direction from the i node to the j node is the x axis direction of the local coordinate system.
Defining a positioning tower material of which the positioning vector vecxz can be in a whole coordinate system, wherein a vector vecx of a connecting vector of the tower material from an i node to a j node under a global coordinate system, a vector vecy of a centroid main shaft y axis of the tower material under the global coordinate system can be obtained by cross multiplication of a space positioning vector vecxz and the vector vecx, and a vector vecz of the centroid main shaft z axis of the tower material under the global coordinate system can be obtained by cross multiplication of the vector vecy and the vector vecx.
Fifthly, selection of positioning vector
Positioning vectors need to be selected according to the actual arrangement direction of tower materials of the transmission tower, because the positioning vectors can select any vectors on the xz section, which are not parallel to the x-axis direction, the tower materials can be positioned by using fewer vectors, for example, non-vertically arranged rod members can be defined by using vector vecxz1 ═ 0,0,1, and vertically arranged rod members can be defined by using vector vecxz2 ═ 1,0,0, and finally a transmission tower space model is formed, as shown in fig. 8.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and those skilled in the art should understand that although the above embodiments are referred to: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is set forth in the claims below.
Claims (2)
- The tower material positioning method of the spatial model of the transmission towers is characterized by comprising the following steps:establishing a tower material section of the power transmission iron tower in a local coordinate system;selecting a positioning vector according to the actual placing direction of the tower material section of the power transmission iron tower;positioning the tower material of the power transmission iron tower in a global coordinate system according to the tower material section, the positioning vector and a vector positioning method;in the local coordinate system, the directions of the centroid main shafts of the sections of the tower materials are respectively a y axis and a z axis; two end points of the cross section of the tower material are an i node and a j node, and the direction from the i node to the j node is the x-axis direction of the local coordinate system;the positioning vector selects any vectors which are not parallel to the direction of the x axis on the section of the x axis and the z axis in the coordinate system as a positioning vector vecxz;the vector positioning method is to determine the relationship between the local coordinate system and the global coordinate system through the positioning vector so as to determine the placing position of the tower material in the spatial global coordinate system;under a global coordinate system, a connecting vector of the tower material section from the node i to the node j is a vector vecx; a vector vecy of the centroid main shaft y axis of the tower material section under a global coordinate system is obtained by cross multiplication of the positioning vector vecxz and the vector vecx; a vector vecz of the tower material section centroid main shaft z axis under a global coordinate system is obtained by cross multiplication of the vector vecy and the vector vecx;the method is characterized in that: in the step: before the tower material section of the power transmission tower is established in the local coordinate system, the method further comprises the following steps:establishing a local coordinate system and a global coordinate system;defining node coordinates of the power transmission iron tower in a coordinate system;establishing a rod piece according to the connection relation between the node coordinates and the power transmission iron tower;the local coordinate system is a space rectangular coordinate system taking the rod piece direction of the power transmission iron tower as an x axis and taking end points of the rod piece as coordinate origin points;the process of defining the coordinates of the nodes of the power transmission towers in the coordinate system comprises the steps of establishing a power transmission tower model under a global coordinate system, defining the coordinates of the nodes on the rod pieces of all the power transmission towers under the global coordinate system, and determining the position information of all the nodes only in space.
- 2. The method for positioning tower materials of the space model of transmission towers according to claim 1, wherein nodes are connected into rod members according to the connection relationship, and two end points of the rod members are determined.
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| CN102645204A (en) * | 2012-04-25 | 2012-08-22 | 云南电力试验研究院（集团）有限公司电力研究院 | Method for determining gradient of geographical position of transmission line pole tower |
| CN103268379A (en) * | 2013-05-21 | 2013-08-28 | 甘肃省电力公司检修公司 | Method for accurately calculating spacing distance between any position spaces of overhead power transmission wires |
| CN104091029A (en) * | 2014-07-18 | 2014-10-08 | 深圳供电局有限公司 | Method and system for establishing three-dimensional dynamic model of power transmission line tower subjected to external force deformation |
| CN104281739A (en) * | 2014-08-26 | 2015-01-14 | 国家电网公司 | Power transmission tower pole stress calculation method based on finite element analysis |
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Patent Citations (4)
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|---|---|---|---|---|
| CN102645204A (en) * | 2012-04-25 | 2012-08-22 | 云南电力试验研究院（集团）有限公司电力研究院 | Method for determining gradient of geographical position of transmission line pole tower |
| CN103268379A (en) * | 2013-05-21 | 2013-08-28 | 甘肃省电力公司检修公司 | Method for accurately calculating spacing distance between any position spaces of overhead power transmission wires |
| CN104091029A (en) * | 2014-07-18 | 2014-10-08 | 深圳供电局有限公司 | Method and system for establishing three-dimensional dynamic model of power transmission line tower subjected to external force deformation |
| CN104281739A (en) * | 2014-08-26 | 2015-01-14 | 国家电网公司 | Power transmission tower pole stress calculation method based on finite element analysis |
Non-Patent Citations (1)
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| 高压输电铁塔结构优化设计方法研究与应用;帅慧明;《中国优秀硕士学位论文全文数据库工程科技辑Ⅱ辑》;20150515;正文第3.2-3.5节 * |
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