Power transmission tower stress state evaluation method and device

Abstract

The invention relates to the technical field of power transmission line health state assessment, and particularly provides a power transmission tower stress state assessment method and device. Recognizing the deformation displacement of an outer node of a rod piece of the to-be-evaluated power transmission tower through the front image and the side image of the to-be-evaluated power transmission tower; determining the deformation displacement of the middle point of the rod piece of the to-be-evaluated power transmission tower based on the deformation displacement of the outer node of the rod piece of the to-be-evaluated power transmission tower; and matching in a pre-constructed database based on the deformation displacement of the midpoint of the rod piece of the to-be-evaluated power transmission tower, and taking the health state corresponding to the matched power transmission tower as the health state of the to-be-evaluated power transmission tower. According to the technical scheme provided by the invention, the stress state of the old iron tower can be conveniently and efficiently evaluated.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission line health status assessment, and particularly relates to a method and device for assessing the stress state of a transmission tower. Background Art

[0002] At present, there are many old transmission towers in the transmission line. During the operation and maintenance process, it is necessary to master their health status for timely repair and reinforcement.

[0003] Traditional tower assessment methods usually involve installing a large number of monitoring devices or testing instruments, such as video monitoring, vibration sensors, strain gauges, etc. This is not only less economical but also the monitoring devices are easily damaged in the outdoor environment. Therefore, there is an urgent need for a method for assessing the stress state of transmission towers for old transmission towers. Summary of the Invention

[0004] In order to overcome the above defects, the present invention proposes a method and device for assessing the stress state of a transmission tower.

[0005] In a first aspect, a method for assessing the stress state of a transmission tower is provided. The method for assessing the stress state of a transmission tower includes:

[0006] Collecting a front image and a side image of the transmission tower to be evaluated, and identifying the deformation displacement of the outer nodes of the members of the transmission tower to be evaluated through the front image and the side image of the transmission tower to be evaluated;

[0007] Determining the deformation displacement of the midpoint of the member of the transmission tower to be evaluated based on the deformation displacement of the outer nodes of the member of the transmission tower to be evaluated;

[0008] Matching based on the deformation displacement of the midpoint of the member of the transmission tower to be evaluated in a pre-constructed database, and taking the health state of the matched transmission tower as the health state of the transmission tower to be evaluated.

[0009] Preferably, the deformation displacement of the midpoint of the member of the transmission tower to be evaluated is as follows:

[0010] S xy _X0 = (S xy _X1 + S xy _X2) / 2

[0011] In the above formula, S xy _X0 is the deformation displacement of the midpoint of the member of the transmission tower to be evaluated in the x-axis direction or the y-axis direction in the preset coordinate system, S xy _X1 is the deformation displacement of one outer node of the member of the transmission tower to be evaluated in the x-axis direction or the y-axis direction in the preset coordinate system, S xy_X2 is the deformation displacement of another outer node of the rod member of the transmission tower to be evaluated in the x-axis direction or y-axis direction in the preset coordinate system, where the x-axis of the preset coordinate system is along the cross arm direction of the transmission tower to be evaluated, and the y-axis is perpendicular to the cross arm direction of the transmission tower to be evaluated.

[0012] Preferably, the pre-constructed database consists of the health states of transmission towers under different working conditions, where a numerical combination of the deformation displacements of the midpoints of the rod members of a group of transmission towers is one working condition.

[0013] Furthermore, the construction process of the pre-constructed database includes:

[0014] Construct a transmission tower simulation model and assign values to the deformation displacements of the midpoints of the rod members of the transmission tower;

[0015] Take the deformation displacements of the midpoints of the rod members of the transmission tower as displacement loads and apply them to the transmission tower simulation model, and calculate the stress values of each rod member of the transmission tower;

[0016] Determine the stress state of each rod member of the transmission tower based on the stress values of each rod member of the transmission tower;

[0017] Determine the health state of the transmission tower based on the stress states of each rod member of the transmission tower;

[0018] Construct a database using the health states of transmission towers under different working conditions.

[0019] Furthermore, the determining the stress state of each rod member of the transmission tower based on the stress values of each rod member of the transmission tower includes:

[0020] When the stress value of a rod member of the transmission tower is not greater than its design value, mark the stress state of this rod member as grade a;

[0021] When the stress value of a rod member of the transmission tower is greater than its design value and less than its yield value, mark the stress state of this rod member as grade b;

[0022] When the stress value of a rod member of the transmission tower is greater than its yield value, mark the stress state of this rod member as grade c.

[0023] Furthermore, the determining the health state of the transmission tower based on the stress states of each rod member of the transmission tower includes:

[0024] When the proportion of rod members of the transmission tower with the stress state marked as grade b ≤ 10% and there are no rod members with the stress state marked as grade c, the health state of the transmission tower is healthy;

[0025] When the proportion of rod members of the transmission tower with the stress state marked as grade b ≤ 30% and the proportion of rod members with the stress state marked as grade c ≤ 10%, the health state of the transmission tower is in a state of attention;

[0026] When the proportion of the stress states of the members of the transmission tower marked as grade c exceeds 10%, the health state of the transmission tower is unhealthy.

[0027] Preferably, the deformation displacement of the midpoint of the member of the transmission tower to be evaluated is matched in a pre-constructed database, including:

[0028] Taking the transmission tower with the minimum Euclidean distance from the deformation displacement of the midpoint of the member of the transmission tower to be evaluated in the pre-constructed database as the transmission tower matched with the transmission tower to be evaluated.

[0029] In a second aspect, a device for evaluating the stress state of a transmission steel tower is provided. The device for evaluating the stress state of a transmission steel tower includes:

[0030] A first analysis module, configured to collect a front image and a side image of the transmission tower to be evaluated, and identify the deformation displacement of the outer nodes of the members of the transmission tower to be evaluated through the front image and the side image of the transmission tower to be evaluated;

[0031] A second analysis module, configured to determine the deformation displacement of the midpoint of the member of the transmission tower to be evaluated based on the deformation displacement of the outer nodes of the member of the transmission tower to be evaluated;

[0032] A third analysis module, configured to perform matching in a pre-constructed database based on the deformation displacement of the midpoint of the member of the transmission tower to be evaluated, and take the health state corresponding to the matched transmission tower as the health state of the transmission tower to be evaluated.

[0033] In a third aspect, a computer device is provided, including: one or more processors;

[0034] The processor is configured to execute one or more programs;

[0035] When the one or more programs are executed by the one or more processors, the method for evaluating the stress state of the transmission steel tower as described above is implemented.

[0036] In a fourth aspect, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed, the method for evaluating the stress state of the transmission steel tower as described above is implemented.

[0037] One or more of the above technical solutions of the present invention have at least one or more of the following beneficial effects:

[0038] The present invention provides a method and device for evaluating the stress state of a transmission tower, including: collecting the front image and side image of the transmission tower to be evaluated, and identifying the deformation displacement of the outer nodes of the members of the transmission tower to be evaluated through the front image and side image of the transmission tower to be evaluated; determining the deformation displacement of the midpoint of the members of the transmission tower to be evaluated based on the deformation displacement of the outer nodes of the members of the transmission tower to be evaluated; matching based on the deformation displacement of the midpoint of the members of the transmission tower to be evaluated in a pre-constructed database, and taking the health state of the matched transmission tower as the health state of the transmission tower to be evaluated. The technical solution provided by the present invention can conveniently and efficiently evaluate the stress state of old transmission towers. Description of the Drawings

[0039] Figure 1 is a schematic flowchart of the main steps of the method for evaluating the stress state of a transmission tower according to an embodiment of the present invention;

[0040] Figure 2 is a schematic diagram of the structure of a transmission tower according to an embodiment of the present invention. Detailed Embodiments

[0041] The following further details the specific embodiments of the present invention with reference to the drawings.

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0043] Embodiment 1

[0044] Refer to the attached Figure 1 , Figure 1 is a schematic flowchart of the main steps of the method for evaluating the stress state of a transmission tower according to an embodiment of the present invention. As Figure 1 shown, the method for evaluating the stress state of a transmission tower in the embodiment of the present invention mainly includes the following steps:

[0045] Step S101: Collect the front image and side image of the transmission tower to be evaluated, and identify the deformation displacement of the outer nodes of the members of the transmission tower to be evaluated through the front image and side image of the transmission tower to be evaluated;

[0046] Step S102: Determine the deformation displacement of the midpoint of the members of the transmission tower to be evaluated based on the deformation displacement of the outer nodes of the members of the transmission tower to be evaluated;

[0047] Step S103: Match based on the deformation displacement of the midpoint of the member of the transmission tower to be evaluated in the pre-constructed database, and use the health state of the matched transmission tower as the health state of the transmission tower to be evaluated.

[0048] In this embodiment, the deformation displacement of the midpoint of the member of the transmission tower to be evaluated is as follows:

[0049] S xy _X0 = (S xy _X1 + S xy _X2) / 2

[0050] In the above formula, S xy _X0 is the deformation displacement of the midpoint of the member of the transmission tower to be evaluated in the x-axis or y-axis direction in the preset coordinate system, S xy _X1 is the deformation displacement of an outer node of the member of the transmission tower to be evaluated in the x-axis or y-axis direction in the preset coordinate system, S xy _X2 is the deformation displacement of another outer node of the member of the transmission tower to be evaluated in the x-axis or y-axis direction in the preset coordinate system. The x-axis of the preset coordinate system is along the cross-arm direction of the transmission tower to be evaluated, and the y-axis is perpendicular to the cross-arm direction of the transmission tower to be evaluated.

[0051] In this embodiment, the pre-constructed database consists of the health states of transmission towers under different working conditions. Among them, a numerical combination of the deformation displacements of the midpoints of the members of a group of transmission towers is one working condition.

[0052] In one embodiment, the construction process of the pre-constructed database includes:

[0053] Construct a transmission tower simulation model and assign values to the deformation displacements of the midpoints of the members of the transmission tower;

[0054] Apply the deformation displacement of the midpoint of the member of the transmission tower as a displacement load to the transmission tower simulation model, and calculate the stress values of each member of the transmission tower;

[0055] Determine the stress state of each member of the transmission tower based on the stress values of each member of the transmission tower;

[0056] Determine the health state of the transmission tower based on the stress states of each member of the transmission tower;

[0057] Construct a database using the health states of transmission towers under different working conditions.

[0058] In one embodiment, the determining the stress state of each member of the transmission tower based on the stress values of each member of the transmission tower includes:

[0059] When the stress value of a member of the transmission tower is not greater than its design value, mark the stress state of this member as grade a;

[0060] When the stress value of a member of the transmission tower is greater than its design value and less than its yield value, the stress state of the member is marked as grade b;

[0061] When the stress value of a member of the transmission tower is greater than its yield value, the stress state of the member is marked as grade c.

[0062] In one embodiment, determining the health state of the transmission tower based on the stress state of each member of the transmission tower includes:

[0063] When the proportion of members of the transmission tower with the stress state marked as grade b is ≤ 10% and there are no members with the stress state marked as grade c, the health state of the transmission tower is healthy;

[0064] When the proportion of members of the transmission tower with the stress state marked as grade b is ≤ 30% and the proportion of members with the stress state marked as grade c is ≤ 10%, the health state of the transmission tower is in a state of attention;

[0065] When the proportion of members of the transmission tower with the stress state marked as grade c exceeds 10%, the health state of the transmission tower is unhealthy.

[0066] In this embodiment, matching the deformation displacement of the midpoint of the member of the transmission tower to be evaluated in a pre - constructed database includes:

[0067] Taking the transmission tower with the minimum Euclidean distance from the deformation displacement of the midpoint of the member of the transmission tower to be evaluated in the pre - constructed database as the transmission tower matched to the transmission tower to be evaluated.

[0068] In a specific embodiment, as Figure 2 shown, a certain transmission tower has upper and lower cross - arms. The outer nodes of the cross - arms are marked as A1, A2, B1, B2, C1, C2, D1, D2 from top to bottom, from left to right, and from front to back. Denote the mid - points of A1 and A2, B1 and B2, C1 and C2, D1 and D2 as A0, B0, C0, D0 respectively. Denote the direction along the cross - arm (i.e., the left - right direction) as the x - direction, and the direction perpendicular to the cross - arm (i.e., the front - back direction) as the y - direction. The deformation displacement of the node is represented by S. For example, S x _A1 represents the deformation displacement of node A1 in the x - direction, and S y _A0 represents the deformation displacement of node A0 in the y - direction. Specifically:

[0069] First step, establish a deformation stress database of the transmission tower;

[0070] Assign values to the deformation displacements S of nodes A0, B0, C0, D0 in the x and y directions respectively;

[0071] For example, Sx _A0 = -1.0 m, -0.6 m, -0.3 m, -0.1 m, 0 m, 0.1 m, 0.3 m, 0.6 m, 1.0 m; S y _A0 = -1.0 m, -0.6 m, -0.3 m, -0.1 m, 0 m, 0.1 m, 0.3 m, 0.6 m, 1.0 m;

[0072] And so on, 9 sets of values are set for the deformation displacements of each node in the x and y directions, forming 9×9 = 81 combinations;

[0073] In this way, there are 81×81×81×81 = 43046721 combinations of the deformation displacements of nodes A0, B0, C0, and D0 in the x and y directions. Take each set of working conditions in the deformation displacement combinations in turn as the displacement load, apply it to the transmission tower, calculate the stress values of each component of the transmission tower, and establish a deformation stress database of the transmission tower.

[0074] Step 2: Establish a stress health status database of the transmission tower;

[0075] Record the calculated stress value of any rod as σ, the design value of the rod material as σ 设计 , and the yield value of the rod material as σ 屈服 . If the calculated stress value σ of the rod ≤ σ 设计 , the stress state of this rod is marked as grade a; if the calculated stress value σ of the rod 设计 <σ<σ 屈服 , the stress state of this rod is marked as grade b; if the calculated stress value σ of the rod ≥ σ 屈服 , the stress state of this rod is marked as grade c.

[0076] Statistically analyze the proportion of different stress states of the transmission tower rods. If the number of grade b rods accounts for ≤ 10% of the total rods of the whole tower and there are no grade c rods, the stress state of this transmission tower is marked as grade A; if the number of grade b rods accounts for ≤ 30% of the total rods of the whole tower and the number of grade c rods accounts for ≤ 10% of the total rods of the whole tower, the stress state of this transmission tower is marked as grade B; if the number of grade c rods accounts for > 10% of the total rods of the whole tower, the stress state of this transmission tower is marked as grade C.

[0077] Grade A is the normal state, grade B is the attention state, and grade C is the unhealthy state.

[0078] Step 3: High-precision image recognition of the deformation displacement of the transmission tower;

[0079] Use a high-definition camera to take high-precision images of the front and side of the transmission tower. Identify the deformation displacements of the outer nodes A1, A2, B1, B2, C1, C2, D1, and D2 of the cross arm of the transmission tower in the x and y directions from the front and side images respectively.

[0080] Calculate the deformation displacements of A0, B0, C0, and D0 in the x and y directions, and take the average value of the nodes on both sides. The calculation process is as follows:

[0081] S x _A0 = (S x _A1 + S x _A2) / 2;

[0082] S y _A0 = (S y _A1 + S y _A2) / 2;

[0083] ……

[0084] S x _D0 = (S x _D1 + S x _D2) / 2;

[0085] S y _D0 = (S y _D1 + S y _D2) / 2;

[0086] Among them, S x _D1 represents the deformation displacement of node D1 in the x direction, and S y _D0 represents the deformation displacement of node D0 in the y direction.

[0087] Step 4: Evaluate the stress state of the transmission tower.

[0088] According to S x _A0, S y _A0, …… S x _D0, S y _D0 values, search the deformation stress database of the transmission tower, match the working conditions with similar values, and then determine the stress health state of the transmission tower.

[0089] Embodiment 2

[0090] Based on the same inventive concept, the present invention also provides a device for evaluating the stress state of a transmission iron tower, and the device for evaluating the stress state of the transmission iron tower includes:

[0091] A first analysis module, configured to collect a front image and a side image of the transmission tower to be evaluated, and identify the deformation displacements of the outer nodes of the rods of the transmission tower to be evaluated through the front image and the side image of the transmission tower to be evaluated;

[0092] A second analysis module, configured to determine the deformation displacements of the midpoints of the rods of the transmission tower to be evaluated based on the deformation displacements of the outer nodes of the rods of the transmission tower to be evaluated;

[0093] A third analysis module, configured to match the deformation displacement of the midpoint of the member of the transmission tower to be evaluated in a pre-constructed database, and use the health status of the corresponding transmission tower after matching as the health status of the transmission tower to be evaluated.

[0094] Preferably, the deformation displacement of the midpoint of the member of the transmission tower to be evaluated is as follows:

[0095] S xy _X0 = (S xy _X1 + S xy _X2) / 2

[0096] In the above formula, S xy _X0 is the deformation displacement of the midpoint of the member of the transmission tower to be evaluated in the x-axis or y-axis direction in the preset coordinate system, S xy _X1 is the deformation displacement of one outer node of the member of the transmission tower to be evaluated in the x-axis or y-axis direction in the preset coordinate system, S xy _X2 is the deformation displacement of the other outer node of the member of the transmission tower to be evaluated in the x-axis or y-axis direction in the preset coordinate system. The x-axis of the preset coordinate system is along the cross arm direction of the transmission tower to be evaluated, and the y-axis is perpendicular to the cross arm direction of the transmission tower to be evaluated.

[0097] Preferably, the pre-constructed database consists of the health statuses of transmission towers under different working conditions. Among them, a numerical combination of the deformation displacements of the midpoints of the members of a group of transmission towers is one working condition.

[0098] Furthermore, the construction process of the pre-constructed database includes:

[0099] Construct a transmission tower simulation model and assign values to the deformation displacements of the midpoints of the members of the transmission tower;

[0100] Apply the deformation displacement of the midpoint of the member of the transmission tower as a displacement load to the transmission tower simulation model, and calculate the stress values of each member of the transmission tower;

[0101] Determine the stress state of each member of the transmission tower based on the stress values of each member of the transmission tower;

[0102] Determine the health status of the transmission tower based on the stress states of each member of the transmission tower;

[0103] Construct a database using the health statuses of transmission towers under different working conditions.

[0104] Furthermore, the determining the stress state of each member of the transmission tower based on the stress values of each member of the transmission tower includes:

[0105] When the stress value of a member of the transmission tower is not greater than its design value, mark the stress state of this member as grade a;

[0106] When the stress value of the member of the transmission tower is greater than its design value and less than its yield value, mark the stress state of the member as grade b;

[0107] When the stress value of the member of the transmission tower is greater than its yield value, mark the stress state of the member as grade c.

[0108] Further, determining the health state of the transmission tower based on the stress state of each member of the transmission tower includes:

[0109] When the proportion of the members of the transmission tower with the stress state marked as grade b ≤ 10% and there are no members with the stress state marked as grade c, the health state of the transmission tower is healthy;

[0110] When the proportion of the members of the transmission tower with the stress state marked as grade b ≤ 30% and the proportion of the members with the stress state marked as grade c ≤ 10%, the health state of the transmission tower is in a state of attention;

[0111] When the proportion of the members of the transmission tower with the stress state marked as grade c exceeds 10%, the health state of the transmission tower is unhealthy.

[0112] Preferably, matching the deformation displacement of the midpoint of the member of the transmission tower to be evaluated in a pre-constructed database includes:

[0113] Take the transmission tower with the smallest Euclidean distance from the deformation displacement of the midpoint of the member of the transmission tower to be evaluated in the pre-constructed database as the transmission tower matched to the transmission tower to be evaluated.

[0114] Embodiment 3

[0115] Based on the same inventive concept, the present invention further provides a computer device, which includes a processor and a memory. The memory is used to store a computer program, and the computer program includes program instructions. The processor is used to execute the program instructions stored in the computer storage medium. The processor may be a Central Processing Unit (CPU), or may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, and is suitable for implementing one or more instructions. Specifically, it is suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of a method for evaluating the stress state of a transmission tower in the above embodiments.

[0116] Embodiment 4

[0117] Based on the same inventive concept, the present invention further provides a storage medium, specifically a computer-readable storage medium (Memory). The computer-readable storage medium is a memory device in a computer device and is used to store programs and data. It can be understood that the computer-readable storage medium here can include both the built-in storage medium in the computer device and, of course, the extended storage medium supported by the computer device. The computer-readable storage medium provides a storage space, and the operating system of the terminal is stored in this storage space. And, one or more instructions suitable for being loaded and executed by the processor are also stored in this storage space. These instructions may be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here may be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The one or more instructions stored in the computer-readable storage medium can be loaded and executed by the processor to implement the steps of a method for evaluating the stress state of a transmission tower in the above embodiments.

[0118] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) that contain computer-usable program code.

[0119] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for realizing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0120] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing devices to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that realizes the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0121] These computer program instructions can also be loaded onto a computer or other programmable data processing devices, such that a series of operation steps are executed on the computer or other programmable devices to generate a computer-implemented process, so that the instructions executed on the computer or other programmable devices provide steps for realizing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: still can modify the specific embodiments of the present invention or make equivalent substitutions, and any modification or equivalent substitution that does not depart from the spirit and scope of the present invention should be covered by the protection scope of the claims of the present invention.

Claims

1. A method for evaluating the stress state of a transmission tower, characterized in that The method includes: Collecting the front image and side image of the transmission tower to be evaluated, and identifying the deformation displacement of the outer nodes of the members of the transmission tower to be evaluated through the front image and side image of the transmission tower to be evaluated; Determining the deformation displacement of the midpoint of the member of the transmission tower to be evaluated based on the deformation displacement of the outer nodes of the member of the transmission tower to be evaluated; Matching based on the deformation displacement of the midpoint of the member of the transmission tower to be evaluated in the pre-constructed database, and taking the health state of the corresponding transmission tower in the match as the health state of the transmission tower to be evaluated.

2. The method according to claim 1, wherein The deformation displacement of the midpoint of the member of the transmission tower to be evaluated is as follows: S xy _X0 = (S xy _X1 + S xy _X2) / 2 In the above formula, S xy _X0 is the deformation displacement of the midpoint of the member of the transmission tower to be evaluated in the x-axis direction or the y-axis direction in the preset coordinate system, and S xy _X1 is the deformation displacement of an outer node of the member of the transmission tower to be evaluated in the x-axis direction or the y-axis direction in the preset coordinate system, and S xy _X2 is the deformation displacement of the other outer node of the member of the transmission tower to be evaluated in the x-axis direction or the y-axis direction in the preset coordinate system. The x-axis of the preset coordinate system is along the cross-arm direction of the transmission tower to be evaluated, and the y-axis is perpendicular to the cross-arm direction of the transmission tower to be evaluated.

3. The method according to claim 1, characterized in that The pre-constructed database consists of the health states of transmission towers under different working conditions. Among them, a numerical combination of the deformation displacements of the midpoints of the members of a group of transmission towers is one working condition.

4. The method according to claim 3, wherein The construction process of the pre-constructed database includes: Constructing a transmission tower simulation model and assigning values to the deformation displacements of the midpoints of the members of the transmission tower; Taking the deformation displacement of the midpoint of the member of the transmission tower as a displacement load and applying it to the transmission tower simulation model, and calculating the stress values of each member of the transmission tower; Determining the stress state of each member of the transmission tower based on the stress values of each member of the transmission tower; Determining the health state of the transmission tower based on the stress state of each member of the transmission tower; Constructing a database using the health states of transmission towers under different working conditions.

5. The method according to claim 4, characterized in that, The determining the stress state of each member of the transmission tower based on the stress values of each member of the transmission tower includes: When the stress value of the member of the transmission tower is not greater than its design value, marking the stress state of this member as grade a; When the stress value of the member of the transmission tower is greater than its design value and less than its yield value, marking the stress state of this member as grade b; When the stress value of the member of the transmission tower is greater than its yield value, marking the stress state of this member as grade c.

6. The method according to claim 5, wherein The determining the health state of the transmission tower based on the stress state of each member of the transmission tower includes: When the proportion of members of the transmission tower with the stress state marked as grade b ≤ 10% and there are no members with the stress state marked as grade c, the health state of the transmission tower is healthy; When the proportion of members of the transmission tower with the stress state marked as grade b ≤ 30% and the proportion of members with the stress state marked as grade c ≤ 10%, the health state of the transmission tower is in a state of attention; When the proportion of members of the transmission tower with the stress state marked as grade c exceeds 10%, the health state of the transmission tower is unhealthy.

7. The method according to claim 1, characterized in that, The matching based on the deformation displacement of the midpoint of the member of the transmission tower to be evaluated in the pre-constructed database includes: Taking the transmission tower with the smallest Euclidean distance from the deformation displacement of the midpoint of the member of the transmission tower to be evaluated in the pre-constructed database as the transmission tower matched with the transmission tower to be evaluated.

8. An apparatus for a method of evaluating the stress state of a transmission tower according to any one of claims 1-7, characterized in that, The device includes: A first analysis module for collecting the front image and side image of the transmission tower to be evaluated, and identifying the deformation displacement of the outer nodes of the members of the transmission tower to be evaluated through the front image and side image of the transmission tower to be evaluated; A second analysis module for determining the deformation displacement of the midpoint of the member of the transmission tower to be evaluated based on the deformation displacement of the outer nodes of the member of the transmission tower to be evaluated; A third analysis module, configured to perform matching in a pre-constructed database based on the deformation displacement of the midpoint of the member of the transmission tower to be evaluated, and use the health status of the matched transmission tower as the health status of the transmission tower to be evaluated.

9. A computer device, characterized in that, Comprising: One or more processors; The processor is configured to execute one or more programs; When the one or more programs are executed by the one or more processors, the method for evaluating the stress state of the transmission iron tower according to any one of claims 1 to 8 is implemented.

10. A computer-readable storage medium, characterized in that, A computer program is stored thereon, and when the computer program is executed, the method for evaluating the stress state of the transmission iron tower according to any one of claims 1 to 8 is implemented.

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