A method, device, equipment and medium for analyzing wind resistance performance of transmission tower

Abstract

The present application discloses a method, device, equipment and medium for analyzing the wind resistance performance of a transmission tower. The method comprises: establishing a virtual model of a transmission tower; interpolating a first wind environment parameter using fluid mechanics to obtain a second wind environment parameter; determining the wind load of the transmission tower based on the second wind environment parameter; applying the wind load to the virtual model to obtain a simulation result. The present application can accurately calculate the force of strong wind on the transmission tower, thereby improving the accuracy of the simulation result.

Description

Technical Field

[0001] The present application relates to the field of monitoring and analysis of transmission towers, and in particular to a method, device, equipment and medium for analyzing the wind resistance performance of transmission towers. Background Art

[0002] The power transmission tower system of the power grid is easily deformed by force under the influence of strong winds, and in severe cases, collapses, disrupting the normal supply of electric energy, and causing greater social and economic losses. Therefore, it is of great significance to study how to improve the wind resistance of transmission towers. At present, with reference to large-scale building facilities, the method of computer virtual simulation calculation is used to analyze the wind resistance of transmission towers. The main method is to establish a digital virtual model of large-scale building facilities in the computer, and at the same time establish a digital virtual strong wind working condition, and apply the virtual strong wind condition to the virtual building facility model, so as to obtain the force conditions of all positions of large-scale building facilities. However, applying this computer virtual simulation calculation method to transmission towers encounters a big problem, that is, the size of the transmission tower is too different from the size of the strong wind environment range, and it is difficult to accurately calculate the force of the wind acting on the transmission tower, resulting in inaccurate simulation results, and thus it is impossible to carry out the analysis of the wind resistance of the transmission tower, and it is also impossible to provide a theoretical basis for improving the wind resistance of the transmission tower. Summary of the invention

[0003] The present application provides a method, device, equipment and medium for analyzing the wind resistance performance of a transmission tower. Through interpolation calculation using fluid mechanics, large-scale strong wind environment parameters can be converted into wind environment parameters that are compatible with the size of the transmission tower, thereby accurately calculating the force of strong winds on the transmission tower, improving the accuracy of simulation results, and providing accurate data for the analysis of the wind resistance performance of the transmission tower.

[0004] In order to achieve the above purpose, this application adopts the following technical solutions:

[0005] In a first aspect, the present application provides a method for analyzing the wind resistance performance of a transmission tower, comprising:

[0006] Build a virtual model of the transmission tower;

[0007] The first wind environment parameter is interpolated and calculated using fluid mechanics to obtain a second wind environment parameter;

[0008] Determining the wind load of the transmission tower based on the second wind environment parameter;

[0009] The wind load is applied to the virtual model to obtain a simulation result.

[0010] According to an achievable method of the first aspect of the present application, the virtual model of the transmission tower is established, including:

[0011] Build a virtual model of the transmission tower;

[0012] Perform detail processing on the virtual model to determine at least one detail part on the virtual model.

[0013] According to an achievable manner of the first aspect of the present application, the determining of the wind load of the transmission tower based on the second wind environment parameter includes:

[0014] According to the wind direction parameter in the second wind environment parameter, determining the detailed part under the wind direction parameter;

[0015] Subdividing the wind speed parameter in the second wind environment parameter to obtain a wind pressure parameter;

[0016] Based on the wind pressure parameter, a local wind load corresponding to the detail part is determined.

[0017] According to an achievable manner of the first aspect of the present application, applying the wind load to the virtual model to obtain a simulation result includes:

[0018] The local wind loads are all applied to the corresponding detail parts of the virtual model to obtain simulation results.

[0019] In a second aspect, the present application provides a device for analyzing wind resistance performance of a transmission tower, comprising:

[0020] A virtual model building module is used to build a virtual model of a transmission tower;

[0021] A second wind environment parameter acquisition module is used to perform interpolation calculation on the first wind environment parameter using fluid mechanics to acquire the second wind environment parameter;

[0022] A wind load determination module, configured to determine the wind load of the transmission tower based on the second wind environment parameter;

[0023] The simulation result acquisition module is used to apply the wind load to the virtual model to obtain the simulation result.

[0024] In a third aspect, the present application provides a device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any one of the above-mentioned methods for analyzing the wind resistance performance of a transmission tower when executing the computer program.

[0025] In a fourth aspect, the present application provides a storage medium storing a computer program, which, when executed by a processor, performs the steps of any one of the above-mentioned methods for analyzing the wind resistance of a transmission tower.

[0026] Compared with the prior art, the present application can convert large-scale strong wind environment parameters into wind environment parameters suitable for the size of the transmission tower through interpolation calculation by fluid mechanics, thereby accurately calculating the force of strong wind on the transmission tower, and then applying the calculated wind force to the established virtual model, which can obtain more accurate simulation results and provide accurate data for the analysis of the wind resistance performance of the transmission tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic flow chart of a method for analyzing wind resistance of a transmission tower provided in a preferred embodiment of the present application;

[0028] Figure 2 A schematic flow chart of a method for analyzing wind resistance of a transmission tower provided in a preferred embodiment of the present application;

[0029] Figure 3 A structural block diagram of a device for analyzing wind resistance of a transmission tower provided in a preferred embodiment of the present application;

[0030] Figure 4 A preferred embodiment of the present application provides a method for analyzing the wind resistance of a transmission tower with different cross-sectional shapes. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0032] The term "comprise" and any variations thereof in the specification and claims of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0033] In the embodiments of the present application, the terms "first", "second", etc. are used to distinguish identical items or similar items with substantially the same effects and functions. It should be understood that there is no logical or temporal dependency between the "first", "second", and "Nth", nor are there any limitations on the quantity and execution order.

[0034] The embodiments of the present application are further described in detail below in conjunction with the drawings in the specification.

[0035] Figure 1 The figure is a flow chart of a method for analyzing the wind resistance of a transmission tower provided in a preferred embodiment of the present application.

[0036] like Figure 1 As shown, the method includes:

[0037] S11. Establish a virtual model of a transmission tower;

[0038] Specifically, a virtual model of a transmission tower may be established through modeling software, and there is a one-to-one correspondence between the virtual model and the transmission tower. The virtual model is used as a model for subsequent simulation analysis.

[0039] S12, performing interpolation calculation on the first wind environment parameter using fluid mechanics to obtain a second wind environment parameter;

[0040] Specifically, the first wind environment parameter refers to the kilometer-level wind environment data provided by the meteorological department, and the second wind environment parameter refers to the meter-level wind environment parameter corresponding to the low-altitude area around the transmission tower. Through interpolation calculation by fluid mechanics, the large-size first wind environment parameter can be converted into a second wind environment parameter that is suitable for the size of the transmission tower.

[0041] Among them, taking the air flow parameter in the first wind environment parameter as an average wind speed of 5 meters per second in an airspace of 10 square kilometers and 50 meters at an altitude as an example, the specific method of converting the first wind environment parameter into the second wind environment parameter through interpolation calculation of fluid mechanics is as follows:

[0042] (1) First, divide the airspace of 10 square kilometers and 50 meters in height into thousands of unit grid spaces. The side length of each grid can be set according to the overall size of the transmission tower.

[0043] (2) Using the aerodynamic NS equation, a wind speed of 5 m / s is loaded into the airspace. Based on the terrain of the airspace, the wind speed is calculated grid by grid. Some grids are 6 m / s, while others are 4 m / s.

[0044] (3) The wind speed in such a fine grid is obtained, which is the wind speed parameter in the second wind environment parameter adapted to the size of the transmission tower mentioned above.

[0045] S13. Determine the wind load of the transmission tower based on the second wind environment parameter;

[0046] Among them, wind load refers to the pressure exerted by air flow on engineering structures. The wind load mentioned here specifically refers to the force exerted by strong wind on transmission towers; the second wind environment parameter includes wind speed parameters, wind direction parameters, etc.;

[0047] Specifically, since the size of the second wind environment parameter is adapted to the size of the transmission tower, the windward surface of the transmission tower can be determined according to the wind direction parameter, and then the projection area of ​​the transmission tower can be determined by the projection surface method. The wind load calculation formula of the power grid industry is then used to determine the wind load of the transmission tower. The specific determination formula is as follows:

[0048]

[0049] Where W s It represents the horizontal wind load perpendicular to the tower surface of the transmission tower, in N; W0 represents the standard value of the reference wind pressure, in N 2 / m 2 ; V represents the wind speed at the reference height, in m / s; μ z Indicates the wind pressure height variation coefficient; μ s A represents the body coefficient of the transmission tower; B2 represents the wind load increase coefficient when the transmission tower is covered with ice; s Represents the projected area of ​​the transmission tower on the windward side, in m 2 β z Represents the wind load adjustment factor of the transmission tower.

[0050] Among them, B2 represents the wind load increase coefficient when the transmission tower is covered with ice. The value is 1 when there is no ice on the transmission tower, 1.1 when the ice thickness is 5mm, 1.2 when the ice thickness is 10mm, 1.6 when the ice thickness is 15mm, 1.8 when the ice thickness is 20mm, 1.8 when the ice thickness is 20mm, and 2.25 when the ice thickness is above 20mm. Since the size of the wind speed parameter in the second wind environment parameter is adapted to the size of the transmission tower, the wind speed at the reference height represented by V is the wind speed parameter in the second wind environment parameter, μ z The wind pressure height variation coefficient represented by is taken as 1; the windward side of the transmission tower is determined according to the wind direction parameter in the second wind environment parameter, and the projection area A of the windward side transmission tower is determined by the projection surface method. s ; Since wind pressure changes continuously with the turbulent changes of wind speed and wind direction, the fluctuating component of wind pressure (fluctuating wind pressure) causes the transmission tower to vibrate near the average lateral displacement, which increases the force on the transmission tower. However, because the transient wind speed has already collected the change of wind speed, β z Set to 1.

[0051] S14, applying the wind load to the virtual model to obtain a simulation result.

[0052] Specifically, the simulation results refer to the impact of wind load on the virtual model after it is applied to the virtual model, such as the tilt angle of the virtual model under the action of the force after the wind load is applied to the virtual model; for example, after the wind load is applied to the virtual model, whether there are cracks or deformations at local locations in the virtual model, etc. The impact of strong winds on transmission towers can be predicted in advance based on these simulation results.

[0053] The present application uses fluid mechanics to perform interpolation calculations to convert large-scale strong wind environment parameters into wind environment parameters that are compatible with the size of the transmission tower, thereby accurately calculating the force of strong winds on the transmission tower, and then applying the calculated wind force to the established virtual model, which can obtain more accurate simulation results and provide accurate data for the analysis of the wind resistance performance of the transmission tower.

[0054] The inventors found in the process of implementing the present application that the overall body coefficient μ of the transmission tower is s It is difficult to calculate. Determining the wind load by the overall shape coefficient of the transmission tower is undoubtedly a complicated task, which will not only affect the simulation efficiency, but may also affect the final simulation results.

[0055] In order to further improve the simulation accuracy while improving the simulation efficiency, Figure 2 is a flow chart of a method for analyzing the wind resistance of a transmission tower provided in a second preferred embodiment of the present application, which is Figure 1 The first preferred embodiment shown is further improved, and the main steps of the method are described as follows:

[0056] S21. Establish a virtual model of a transmission tower;

[0057] Specifically, a virtual model of a transmission tower may be established through modeling software, and there is a one-to-one correspondence between the virtual model and the transmission tower. The virtual model is used as a model for subsequent simulation analysis.

[0058] S22, performing detail processing on the virtual model to determine at least one detail part on the virtual model;

[0059] Specifically, the detail parts refer to the parts on the virtual model that may be subjected to wind loads. By processing the virtual model in detail, the specific information of the detail parts on the virtual model that may be subjected to wind loads can be determined, such as the outline, area, and cross-section of these detail parts. Most of the cross-sectional shapes of these detail parts are "L"-shaped, and the cross-sectional shapes of the detail parts near the hanging points are "T"-shaped. There are also a few detail parts with cross-sectional shapes of "circular", "square", "rectangular", etc.

[0060] S23, performing interpolation calculation on the first wind environment parameter using fluid mechanics to obtain a second wind environment parameter;

[0061] Specifically, the first wind environment parameter refers to the kilometer-level wind environment data provided by the meteorological department, and the second wind environment parameter refers to the meter-level wind environment parameter corresponding to the low-altitude area around the transmission tower. Through interpolation calculation by fluid mechanics, the large-size first wind environment parameter can be converted into a second wind environment parameter that is suitable for the size of the transmission tower.

[0062] S24, determining a detailed part under the wind direction parameter according to the wind direction parameter in the second wind environment parameter;

[0063] Specifically, the windward surface of the virtual model can be determined according to the wind direction parameter in the second wind environment parameter, thereby determining the detailed parts on the windward surface side of the virtual model, and all of these detailed parts on the windward surface are subject to wind load.

[0064] S25, subdividing the wind speed parameter in the second wind environment parameter to obtain a wind pressure parameter;

[0065] Specifically, the wind speed parameter here refers to the wind speed at the reference height. Since the wind speed of different landforms will change with the height, the wind speed parameter can be subdivided according to different landforms and different heights to obtain the wind pressure parameter. The wind pressure parameter is obtained by subdividing the wind speed parameter. The specific subdivision processing steps are: first, the wind speed parameter is subdivided by the formula W0=V 2 / 1.6 is converted into the reference wind pressure parameter, where W0 represents the reference wind pressure parameter and V represents the wind speed parameter; the wind pressure parameter is then determined based on the wind pressure height variation coefficient at different heights of different landforms. The relationship between the reference wind pressure parameter and the wind pressure parameter is W=W0·μ z , where W is used to represent the wind pressure parameter, μ z Represents the coefficient of variation of wind pressure height.

[0066] The wind pressure height variation coefficient at different heights in different landforms can be obtained through the following table:

[0067]

[0068] The above table mainly records the wind pressure height variation coefficients of four types of landforms, A, B, C, and D, at different altitudes:

[0069] Category A refers to offshore seas and islands, coasts, lake shores and desert areas;

[0070] Category B refers to fields, villages, jungles, hills, and towns and urban suburbs where houses are sparsely populated;

[0071] Category C refers to urban areas with densely built-up areas;

[0072] Category D refers to urban areas with densely packed buildings and taller houses.

[0073] S26. Determine the local wind load corresponding to the detail part based on the wind pressure parameter;

[0074] Specifically, the local wind load corresponding to the detailed parts can be determined by the wind load calculation formula of the power grid industry. The specific determination formula is as follows:

[0075]

[0076] Where W s Indicates the horizontal wind load perpendicular to the detail part, in N; W0 indicates the standard value of the reference wind pressure, in N 2 / m 2 ; V represents the wind speed at the reference height, in m / s; μ z Indicates the wind pressure height variation coefficient; μ s Indicates the body coefficient of the detail part; B2 indicates the wind load increase coefficient when the detail part is covered with ice; A s Indicates the projected area of ​​the windward surface details, in m 2 β z Indicates the wind load adjustment factor for detail parts.

[0077] Among them, since the cross-sectional shape of each detail part can be determined, according to Figure 4 The data provided can determine the body shape coefficient μ of each detail part s .

[0078] Among them, B2 represents the wind load increase coefficient when the detail part is covered with ice. The value of B2 is 1 when there is no ice on the detail part, 1.1 when the ice thickness is 5 mm, 1.2 when the ice thickness is 10 mm, 1.6 when the ice thickness is 15 mm, 1.8 when the ice thickness is 20 mm, 1.8 when the ice thickness is 20 mm, and 2.25 when the ice thickness is above 20 mm. Since the wind pressure keeps changing with the turbulent changes of wind speed and wind direction, the fluctuating component (fluctuating wind pressure) of the wind pressure causes the detail part to vibrate near the average lateral displacement, resulting in an increase in the force on the detail part. However, since the transient wind speed has already collected the change of wind speed, β z Set to 1; determine the windward side of the transmission tower according to the wind direction parameter in the second wind environment parameter, thereby determining the detail part on the windward side of the virtual model, and determine the projection area A of the detail part by the projection surface method according to the wind direction parameter s ;μ z The wind pressure height variation coefficient represented can be obtained according to the above-mentioned wind pressure height variation coefficient table at different altitudes of different landforms.

[0079] S27, applying all the local wind loads to corresponding detail parts of the virtual model to obtain simulation results.

[0080] Specifically, local wind load refers to the wind force on the windward side of the transmission tower. All these local wind loads are applied to the corresponding details of the virtual model, so as to obtain a force result of the virtual model, that is, a simulation result. For example, after all the local wind loads are applied to the corresponding details of the virtual model, the virtual model tilts at an angle under the action of the force; for example, after all the local wind loads are applied to the corresponding details of the virtual model, whether the details have cracks or deformation, etc. The impact of strong winds on transmission towers can be predicted in advance based on these simulation results.

[0081] The embodiment of the present application calculates the local wind loads of each detail of the transmission tower and then applies these local wind loads to the corresponding detail parts one by one, so as to obtain a more accurate simulation result.

[0082] Figure 3 The third preferred embodiment of the present application provides a device for analyzing the wind resistance of a transmission tower. The device corresponds to the method in the above embodiment one by one. The device includes:

[0083] A virtual model building module 301 is used to build a virtual model of a transmission tower;

[0084] A second wind environment parameter acquisition module 302 is used to perform interpolation calculation on the first wind environment parameter using fluid mechanics to acquire a second wind environment parameter;

[0085] A wind load determination module 303, configured to determine the wind load of the transmission tower based on the second wind environment parameter;

[0086] The simulation result acquisition module 304 is used to apply the wind load to the virtual model to obtain a simulation result.

[0087] Preferably, the virtual model building module 301 specifically includes:

[0088] A virtual model building unit, used for building a virtual model of a transmission tower;

[0089] The first detail part determining unit is used to perform detail processing on the virtual model to determine at least one detail part on the virtual model.

[0090] Preferably, the wind load determination module 303 specifically includes:

[0091] A second detail part determining unit, configured to determine the detail part under the wind direction parameter according to the wind direction parameter in the second wind environment parameter;

[0092] A wind pressure parameter obtaining unit, used for subdividing the wind speed parameter in the second wind environment parameter to obtain a wind pressure parameter;

[0093] A local wind load determination unit is used to determine the local wind load corresponding to the detail part based on the second wind speed parameter.

[0094] Preferably, the simulation result acquisition module 304 specifically includes:

[0095] The simulation result acquisition unit is used to apply all the local wind loads to the corresponding detail parts of the virtual model to obtain simulation results.

[0096] In a more preferred embodiment, a storage medium is further provided, wherein a computer program is stored in the storage medium, and when the computer program is executed by a processor, the steps of any one of the above-mentioned methods for analyzing the wind resistance performance of a transmission tower are performed.

[0097] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

[0098] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. The storage medium can be a disk, an optical disk, a ROM (Rend-Only Memory) or a Random Access Memory (RnM), etc.

Claims

1. A method for analyzing the wind resistance performance of a transmission tower, characterized in that: include: Build a virtual model of the transmission tower; Performing detail processing on the virtual model to determine at least one detail part on the virtual model; the detail part refers to a part on the virtual model that will bear the wind load; by performing detail processing on the virtual model, specific information of the detail part on the virtual model that will bear the wind load is determined; the specific information includes the outline, area, and cross section of the detail part; The first wind environment parameter is interpolated and calculated using fluid mechanics to convert the large-size first wind environment parameter into a second wind environment parameter adapted to the size of the transmission tower; the first wind environment parameter refers to kilometer-level wind environment data provided by the meteorological department; the second wind environment parameter refers to meter-level wind environment parameters corresponding to the low-altitude area around the transmission tower; Determining the wind load of the transmission tower based on the second wind environment parameter; The wind load is applied to the virtual model to obtain a simulation result.

2. The method for analyzing wind resistance of transmission towers according to claim 1, characterized in that: The determining of the wind load of the transmission tower based on the second wind environment parameter includes: According to the wind direction parameter in the second wind environment parameter, determining the detailed part under the wind direction parameter; Subdividing the wind speed parameter in the second wind environment parameter to obtain a wind pressure parameter; Based on the wind pressure parameter, a local wind load corresponding to the detail part is determined.

3. The method for analyzing the wind resistance performance of a transmission tower according to claim 2, characterized in that: The step of applying the wind load to the virtual model to obtain a simulation result includes: The local wind loads are all applied to the corresponding detail parts of the virtual model to obtain simulation results.

4. An analysis device for wind resistance performance of a transmission tower, characterized in that: include: A virtual model building module is used to build a virtual model of a transmission tower; A detail processing module is used to perform detail processing on the virtual model to determine at least one detail part on the virtual model; the detail part refers to a part on the virtual model that will bear the wind load; by performing detail processing on the virtual model, specific information of the detail part on the virtual model that bears the wind load is determined; the specific information includes the outline, area, and cross section of the detail part; The second wind environment parameter acquisition module is used to perform interpolation calculation on the first wind environment parameter using fluid mechanics to convert the large-sized first wind environment parameter into a second wind environment parameter adapted to the size of the transmission tower; the first wind environment parameter refers to the kilometer-level wind environment data provided by the meteorological department; the second wind environment parameter refers to the meter-level wind environment parameter corresponding to the low-altitude area around the transmission tower; A wind load determination module, configured to determine the wind load of the transmission tower based on the second wind environment parameter; The simulation result acquisition module is used to apply the wind load to the virtual model to obtain the simulation result.

5. A device, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein when the processor executes the computer program, the steps of the method for analyzing the wind resistance performance of a transmission tower as claimed in any one of claims 1 to 3 are implemented.

6. A storage medium, characterized in that: The storage medium stores a computer program, which, when executed by a processor, implements the steps of the method for analyzing the wind resistance performance of a transmission tower as claimed in any one of claims 1 to 3.

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