A method, device, storage medium and server for researching mechanical properties of a power transmission line

Abstract

The application provides a power transmission line mechanical property research method, device, storage medium and server, and relates to the field of power transmission line research. The power transmission line mechanical property research method comprises the following steps: acquiring basic parameters of an electric wire; acquiring a micro-wind excitation force of a line where the electric wire is arranged; calculating power input to the electric wire by wind load, power consumed by self-damping of the electric wire and power consumed by a damper; calculating a theoretical service life of the power transmission line; calculating minimum energy consumption conditions required for installation of the damper of the electric wire with different cross-sectional areas; finding out the cross-sectional area of the electric wire, the number, type and installation position of the damper when the fatigue damage condition of the electric wire is the least; acquiring an actual field damper arrangement; and judging whether the field damper arrangement is consistent with the experimental conclusion. The application can provide accurate and targeted research on installation of the damper, and is beneficial to improving the effect of the damper.

Description

Technical Field

[0001] This invention relates to the field of power transmission line research, and more specifically, to a method, apparatus, storage medium, and server for studying the mechanical properties of power transmission lines. Background Technology

[0002] The cross-sectional area of ​​the transmission lines currently being studied is typically 500 mm². 2 Large-section conductors offer advantages such as better mechanical properties, increased transmission power, and reduced energy loss, and are commonly used in ultra-high voltage transmission lines. Field testing and indoor vibration measurements are crucial techniques for assessing the quality of vibration damping designs, the rationality of vibration damper installation locations, and key influencing factors of wind-induced vibration. Therefore, theoretical analysis of wind-induced vibration in conductors is relatively complex. When a conductor experiences wind-induced vibration, the dynamic bending strain at various points on the conductor is calculated to ensure it remains within the specified allowable range. The fatigue life of the conductor is then calculated based on the calculated maximum dynamic bending strain. The study investigates how transmission lines experience wind-induced vibration and calculates the vibration stress or dynamic bending strain of the conductor. Wind-induced vibration is a small-amplitude, high-frequency vibration of the transmission conductor caused by the so-called "Karman eddy currents" that occur after wind loads pass over it. It frequently occurs on long, nearly cylindrical objects like conductors and ground wires, and is a phenomenon of eddy current backflow. The inventors found in their long-term research that there is relatively little research on the stress analysis and energy consumption of the vibratory hammer around the large cross-section conductor under wind vibration, and there is also relatively little research on the fatigue life and stress calculation of wind vibration. Therefore, this application conducts calculation and analysis research on the energy consumption, stress analysis and fatigue life calculation near the vibratory hammer of the transmission line, so as to improve the effect of the vibratory hammer. Summary of the Invention

[0003] The objectives of this invention include, for example, providing a method, apparatus, storage medium, and server for studying the mechanical characteristics of transmission lines, which can provide accurate and targeted research on the installation of vibration dampers, thereby improving the effectiveness of vibration dampers.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] In a first aspect, embodiments of the present invention provide a method for studying the mechanical characteristics of transmission lines, including:

[0006] Step S1: Obtain the basic parameters of the wire, wherein the basic parameters of the wire include the mass per unit length of the wire, the self-damping coefficient, the average running tension, and the bending stiffness of the wire itself.

[0007] Step S2: Obtain the wind excitation force along the line where the power line is located;

[0008] Step S3: Based on the basic parameters of the wire and the wind excitation force of the line where the wire is located, calculate the power of the wind load input to the wire, the power consumed by the wire's self-damping, and the power consumed by the vibration damper.

[0009] Step S4: Calculate the theoretical service life of the transmission line based on the power of the wind load input to the power line, the power consumed by the self-damping of the power line, and the power consumed by the vibration damper.

[0010] Step S5: Based on steps S1 to S4 above, calculate the minimum energy consumption conditions that the installation of vibration dampers for wires with different cross-sectional areas needs to meet, wherein the installation of vibration dampers includes the number, type and installation location of vibration dampers.

[0011] Step S6: Based on finite element analysis, determine the wire cross-sectional area, the number, type, and installation location of vibration dampers when the fatigue damage of the wire is minimized.

[0012] Step S7: Obtain the actual layout of the vibration dampers on site, wherein the actual layout of the vibration dampers on site includes the number, type and installation location of the vibration dampers on site;

[0013] Step S8: Compare the actual layout of the vibration dampers on site with the cross-sectional area of ​​the wire, the number, type, and installation location of the vibration dampers when the fatigue damage of the wire is minimized, and determine whether the layout of the vibration dampers on site conforms to the experimental conclusion.

[0014] Further, in an optional embodiment, the step of calculating the power of the wind load input to the wire, the power consumed by the wire's self-damping, and the power consumed by the vibration damper based on the basic parameters of the wire and the wind excitation force of the line where the wire is located includes:

[0015] By inputting the basic parameters of the power line and the wind excitation force of the line into the vibration dynamic equation, the power of the wind load input to the power line, the power consumed by the power line's self-damping, and the power consumed by the vibration damper are obtained. The vibration dynamic equation of the power line is as follows:

[0016]

[0017] In the formula, x is the coordinate along the direction of the power line, y is the coordinate of the vertical displacement of the power line vibration, t is time, m is the mass per unit length of the power line, c is the self-damping coefficient of the power line, T is the average running tension of the power line, EJ is the bending stiffness of the power line itself, and p(x,t) is the wind excitation force per unit length, and in the formula, The bending moment of the wire section is

[0018] Further, in an optional embodiment, in step S5: calculating the minimum energy consumption conditions that the installation of vibration dampers for wires with different cross-sectional areas needs to meet based on steps S1 to S4 above, wherein the installation of the vibration dampers includes the steps of determining the number, type, and installation location of the vibration dampers, the following steps are included:

[0019] The energy consumption of the vibration damper is calculated using the energy consumption calculation formula, wherein the energy consumption calculation formula is:

[0020] P d =πf|F||y|sinα(A / A0) 2

[0021] In the formula, P d The energy consumption of the vibration damper is represented by f, the vibration frequency, F, the force exerted by the vibration damper clamp on the wire, F,y, the vertical displacement of the vibration damper clamp head, α, the angle between the vibration damper clamp and the wire, A, the maximum amplitude of the vibration damper clamp, and A0, the initial amplitude of the vibration damper clamp relative to the wire when it is in equilibrium.

[0022] Based on the energy consumption of the vibration damper, determine the number and location of the vibration dampers to be installed.

[0023] Further, in an optional embodiment, the step of determining the number and location of vibration dampers based on their energy consumption includes:

[0024] Calculate the installation distance of the vibration damper using the following formula:

[0025]

[0026] In the formula: S is the installation distance, λ m λ is the wavelength of maximum vibration. n It is the minimum vibration wavelength.

[0027] Secondly, the present invention provides a device for studying the mechanical characteristics of transmission lines, comprising:

[0028] First acquisition module: The first acquisition module is used to acquire the basic parameters of the wire, wherein the basic parameters of the wire include the mass per unit length of the wire, the self-damping coefficient, the average operating tension, and the bending stiffness of the wire itself.

[0029] Second acquisition module: The second acquisition module is used to acquire the wind excitation force of the line where the power line is located;

[0030] First calculation module: The first calculation module is used to calculate the power of wind load input to the wire, the power consumed by the wire's self-damping, and the power consumed by the vibration damper based on the basic parameters of the wire and the wind excitation force of the line where the wire is located.

[0031] Second calculation module: The second calculation module is used to calculate the theoretical service life of the transmission line based on the power of the wind load input wire, the power consumed by the self-damping of the wire, and the power consumed by the vibration damper.

[0032] The third calculation module is used to calculate the minimum energy consumption conditions that the installation of anti-vibration hammers for wires with different cross-sectional areas needs to meet according to the above steps S1 to S4. The installation of the anti-vibration hammers includes the number, type and installation position of the anti-vibration hammers.

[0033] Find out module: The find out module is used to find out the cross-sectional area of ​​the wire and the number, type and installation position of the vibration dampers when the fatigue damage of the wire is minimized based on finite element analysis;

[0034] The third acquisition module is used to acquire the actual layout of the vibration dampers on site, wherein the actual layout of the vibration dampers on site includes the number, type and installation location of the vibration dampers on site.

[0035] Judgment Module: The judgment module is used to compare the actual on-site arrangement of vibration dampers with the cross-sectional area of ​​the wire, the number, type, and installation position of the vibration dampers when the wire fatigue damage is minimized, and to determine whether the on-site arrangement of vibration dampers conforms to the experimental conclusion.

[0036] Furthermore, in an optional embodiment, the first computing module is further configured to:

[0037] By inputting the basic parameters of the power line and the wind excitation force of the line into the vibration dynamic equation, the power of the wind load input to the power line, the power consumed by the power line's self-damping, and the power consumed by the vibration damper are obtained. The vibration dynamic equation of the power line is as follows:

[0038]

[0039] In the formula, x is the coordinate along the direction of the power line, y is the coordinate of the vertical displacement of the power line vibration, t is time, m is the mass per unit length of the power line, c is the self-damping coefficient of the power line, T is the average running tension of the power line, EJ is the bending stiffness of the power line itself, and p(x,t) is the wind excitation force per unit length, and in the formula, The bending moment of the wire section is

[0040] Furthermore, in an optional embodiment, the third computing module is also used for:

[0041] The energy consumption of the vibration damper is calculated using the energy consumption calculation formula, wherein the energy consumption calculation formula is:

[0042] P d =πf|F||y|sinα(AtA0) 2

[0043] In the formula, P d The energy consumption of the vibration damper is represented by f, the vibration frequency, F, the force exerted by the vibration damper clamp on the wire, F,y, the vertical displacement of the vibration damper clamp head, α, the angle between the vibration damper clamp and the wire, A, the maximum amplitude of the vibration damper clamp, and A0, the initial amplitude of the vibration damper clamp relative to the wire when it is in equilibrium.

[0044] Based on the energy consumption of the vibration damper, determine the number and location of the vibration dampers to be installed.

[0045] Furthermore, in an optional embodiment, the third computing module is also used for:

[0046] Calculate the installation distance of the vibration damper using the following formula:

[0047]

[0048] In the formula: S is the installation distance, λ m λ is the wavelength of maximum vibration. n It is the minimum vibration wavelength.

[0049] Thirdly, embodiments of the present invention provide a storage medium comprising a stored program, wherein, when the program is executed, the device containing the storage medium is controlled to execute the aforementioned method for studying the mechanical characteristics of transmission lines.

[0050] Fourthly, embodiments of the present invention provide a server, including a memory and a processor, wherein the memory stores a program for studying the mechanical characteristics of transmission lines, and when the processor reads and executes the program, it implements the method for studying the mechanical characteristics of transmission lines as described above. Attached Figure Description

[0051] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as limiting the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 This is a schematic diagram of the structure of the transmission line mechanical characteristic research device according to a specific embodiment of the present invention;

[0053] Figure 2 This is a flowchart illustrating the method for studying the mechanical characteristics of transmission lines according to a specific embodiment of the present invention;

[0054] Figure 3 A schematic diagram showing the force relationship between the anti-vibration hammer clamp and the transmission line;

[0055] Figure 4 A reference table showing the relationship between the number of vibration dampers installed and the conductor diameter and span.

[0056] Icons: 100 - Transmission line mechanical characteristics research device; 200 - Memory; 300 - Processor. Detailed Implementation

[0057] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0058] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0059] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0060] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0061] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0062] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0063] The method and apparatus 100 for studying the mechanical characteristics of transmission lines provided in this embodiment of the invention are both applied to a server, which can be, but is not limited to, a desktop computer, laptop computer, tablet computer, or mobile phone. Please refer to... Figure 1 This is a schematic diagram of the structure of the transmission line mechanical characteristic research device 100 provided in an embodiment of the present invention. The service terminal is used to run the processing program for researching the mechanical characteristics of transmission lines. The server includes a memory 200, a processor 300, and the transmission line mechanical characteristic research device 100.

[0064] The components of the memory 200 and processor 300 are electrically connected directly or indirectly to achieve data transmission or interaction. For example, these components can be electrically connected to each other through one or more communication buses or signal lines. The transmission line mechanical characteristics research device 100 includes at least one software function module that can be stored in the memory 200 or embedded in the operating system (OS) of the service terminal in the form of software or firmware. The processor 300 is used to execute the executable modules stored in the memory 200, such as the software function modules and computer programs included in the transmission line mechanical characteristics research device 100.

[0065] The memory 200 may be, but is not limited to, Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), etc. The memory 200 stores programs, which are executed by the processor 300 upon receiving execution instructions.

[0066] In addition, the functional modules in the various embodiments of the present invention can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0067] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, essentially, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0068] Please see Figure 2 This embodiment provides a method for studying the mechanical characteristics of transmission lines, which can provide accurate and targeted research on the installation of vibration dampers, and is conducive to improving the effect of vibration dampers.

[0069] like Figure 2 As shown, the method for studying the mechanical characteristics of this transmission line includes the following steps.

[0070] Step S1: Obtain the basic parameters of the wire, including the mass per unit length of the wire, the self-damping coefficient, the average operating tension, and its own bending stiffness.

[0071] Step S2: Obtain the wind excitation force along the line where the power line is located.

[0072] Step S3: Based on the basic parameters of the wire and the wind excitation force of the line where the wire is located, calculate the power of the wind load input to the wire, the power consumed by the wire's self-damping, and the power consumed by the vibration damper.

[0073] Step S4: Calculate the theoretical service life of the transmission line based on the power of the wind load input to the power line, the power consumed by the self-damping of the power line, and the power consumed by the vibration damper.

[0074] Step S5: Based on steps S1 to S4 above, calculate the minimum energy consumption conditions that the installation of vibration dampers for wires with different cross-sectional areas needs to meet. The installation of vibration dampers includes the number, type, and installation location of the vibration dampers.

[0075] Step S6: Based on the finite element analysis, determine the wire cross-sectional area and the number, type, and installation location of vibration dampers when the wire fatigue damage is minimized.

[0076] Step S7: Obtain the actual layout of the vibration dampers on site, including the number, type and installation location of the vibration dampers.

[0077] Step S8: Compare the actual layout of the vibration dampers on site with the cross-sectional area of ​​the wire and the number, type and installation location of the vibration dampers when the wire fatigue damage is minimized, and determine whether the layout of the vibration dampers on site conforms to the experimental conclusion.

[0078] It should be noted that calculating the wind vibration of conductors requires establishing a suitable mathematical model, and the intensity of wind vibration can be calculated using numerical methods. Based on the energy balance method, the wind excitation force and the self-damping of the transmission line are derived, and the dynamic equation for the wind vibration of the conductor is established. The embodiments of this invention propose the following assumptions:

[0079] Assumption 1: When a power transmission line experiences a slight wind vibration, the conductor only vibrates continuously in the vertical plane, and its slope satisfies the equation.

[0080] Assumption 2: The transmission line is simplified to a cable structure, and its tension, mass, and modulus of elasticity along the conductor direction remain basically unchanged;

[0081] Assumption 3: The simplified structure of the transmission line satisfies the Euler-Bernoulli beam theory, meaning the bending moment of the conductor section after simplification is...

[0082] Based on the above assumptions, in this embodiment, step S3 includes the following steps:

[0083] By inputting the basic parameters of the power line and the wind excitation force along the line into the vibration dynamic equation, the power of the wind load input to the power line, the power consumed by the power line's self-damping, and the power consumed by the vibration damper are obtained. The vibration dynamic equation of the power line is as follows:

[0084]

[0085] In the formula, x is the coordinate along the direction of the power line, y is the coordinate of the vertical displacement of the power line vibration, t is time, m is the mass per unit length of the power line, c is the self-damping coefficient of the power line, T is the average running tension of the power line, EJ is the bending stiffness of the power line itself, and p(x,t) is the wind excitation force per unit length, and in the formula, The bending moment of the wire cross section is

[0086] It should be noted that, in the embodiments of the present invention, regarding the wind excitation force, when the transmission line is in a relatively stable wind field, a stable Karman vortex appears on the back side of the transmission line, and then a lift force F appears on the transmission line, and it is found that the amplitude of this force varies sinusoidally with time.

[0087] Assume the vertical vibration displacement of the transmission line is:

[0088] y = -y0cos(ωt - φ)

[0089] In the formula, φ is the phase difference between the lifting force and the displacement; y0 is the single amplitude; and the above formula has a negative sign determined by the direction of acceleration and force.

[0090] Within T / 2, the average value of the wind load input (W / m) can be written as:

[0091]

[0092] In the formula, ω = 2πf; when the synchronization effect occurs, cosφ = 1, and we have:

[0093] P W =πF y fy0

[0094] The excitation force of the breeze, expressed as a dimensionless P(X), is as follows:

[0095]

[0096] Currently, researchers and experts both domestically and internationally largely use the Diana & Falco wind energy input expression, as shown in the formula:

[0097]

[0098] Substituting the values, we can derive the breeze excitation expression based on Diana & Falco:

[0099]

[0100] In the formula, a1, a2, and a3 are all constants; P(X) is the dimensionless force.

[0101] It should also be noted that the self-damping coefficient of the equivalent conductor for power transmission is different from that of viscous damping. The energy consumed by self-damping is basically the energy consumed by friction between the strands of the power transmission conductor.

[0102] The self-damping of a power line can be calculated using the following formula:

[0103]

[0104] H C The hysteresis damping constant of the transmission line varies depending on the type of line and is generally determined through a self-damping test of the line.

[0105] According to structural dynamics, the vibration equation of a single-degree-of-freedom system with viscous damping is as follows:

[0106]

[0107] In the formula, m represents the mass of the single-degree-of-freedom system, kg; c represents the viscous damping coefficient of the single-degree-of-freedom system, Ns / m; k represents the stiffness of the single-degree-of-freedom system, N / m; y represents the displacement of the single-degree-of-freedom system, m; and P(t) represents the external excitation, in N.

[0108] Under the action of a simple harmonic load p(t) = Psinωt, the equivalent self-damping coefficient can be solved.

[0109]

[0110] As can be seen from the above, the mathematical model of conductor vibration in wind using dynamic methods is closely related to the traditional energy balance method used in daily life.

[0111] The aerobatic vibration of power transmission lines occurs in wind speeds ranging from 0.5 m / s to 10 m / s, where the air is in a laminar flow state. Studies have shown that under these conditions, the energy delivered by wind to the transmission line is closely related to the structural parameters of the conductor and the wind speed. The general expression for wind energy input power is as follows:

[0112] P W =F(V)F(A / D)f 3 D 4

[0113] Among them, F(V) and F(A / D) need to be given through experiments.

[0114] The self-damping power of a transmission line refers to the power of the transmission line itself that consumes (absorbs) mechanical vibration energy during vibration. Transmission line self-damping includes two parts: material deformation damping and structural deformation damping, and is related to factors such as materials, manufacturing processes, operating tension, vibration frequency, antinode amplitude, and ambient temperature. Because the self-damping of transmission lines is highly dispersed and influenced by many complex factors, it is currently mainly determined experimentally, and it is difficult to derive it theoretically. Commonly used measurement methods are the power method and the standing wave method. Under a given tension, the expression for the self-damping power per unit length of a vibrating conductor is:

[0115]

[0116] In the formula: H is the self-damping coefficient; y0 is the double amplitude; λ and f are the vibration wavelength and frequency, respectively; m and n are coefficients that vary depending on the transmission line, generally n = 3~4 and m = 2~2.5. The H coefficient decreases with increasing tension because when the tension is high, the pressure between the strands increases, and it is difficult for sliding friction to dissipate energy between the strands during dynamic bending, thus reducing the damping effect. When the transmission line cannot guarantee its safety under light wind vibration by self-damping alone, a damper needs to be installed.

[0117] It should be noted that in general studies, vibration dampers are treated as black boxes; the energy dissipation of the vibration damper can be calculated simply by determining the relationship between the force (torque) and displacement (rotation angle) at its clamp. Let the force exerted by the vibration damper clamp on the transmission line be f. D (t), the bending moment is M D (t), the vertical displacement of the vibration damper chuck is y D (t), with a rotation angle of φ D (t), the specific location is as follows Figure 3 As shown.

[0118] In step S5, the energy consumption of the vibration damper is calculated using the energy consumption calculation formula; and based on the energy consumption of the vibration damper, the number and installation location of the vibration dampers are determined. In this embodiment, the energy consumption calculation formula is:

[0119] P d =πf|F||y|sinα(A / A0) 2

[0120] In the formula, P d The energy consumption of the vibration damper is represented by f, the vibration frequency is F, the force exerted by the vibration damper clamp on the wire is F,y is the vertical displacement of the vibration damper clamp head; α is the angle between the vibration damper clamp and the wire; A is the maximum amplitude of the vibration damper clamp; and A0 is the initial amplitude of the vibration damper clamp relative to the wire when it is in equilibrium.

[0121] The selection of vibration dampers for overhead lines is generally based on the conductor grade. The first vibration damper should be installed within the first half-wavelength of the line clamp outlet. The principle for installation is that, for both the maximum and minimum wavelengths, the damper's installation position should be within the first half-wavelength range, and the distance to the antinodes of both wavelengths should be equal. In the steps described above for determining the number and location of vibration dampers based on their energy consumption, the installation distance of the vibration dampers is calculated using the following formula:

[0122]

[0123] In the formula: S is the installation distance, λ m λ is the wavelength of maximum vibration. n It is the minimum vibration wavelength.

[0124] It should be noted that the number of vibration dampers installed can be based on... Figure 4 Select from the table shown. When installing multiple vibration dampers, an equidistant installation method is generally used, that is, the first one is installed at a distance S from the clamp outlet, the second at 2S, the third at 3S, and so on.

[0125] This invention provides a device 100 for studying the mechanical properties of transmission lines, comprising a first acquisition module, a second acquisition module, a first calculation module, a second calculation module, a third calculation module, a detection module, a third acquisition module, and a judgment module. The first acquisition module acquires basic parameters of the power line, including the mass per unit length, self-damping coefficient, average operating tension, and bending stiffness. The second acquisition module acquires the wind excitation force of the line. The first calculation module calculates the power of wind load input to the power line, the power consumed by the power line's self-damping, and the power consumed by the vibration damper based on the basic parameters of the power line and the wind excitation force of the line. The second calculation module calculates the theoretical service life of the transmission line based on the power of wind load input to the power line, the power consumed by the power line's self-damping, and the power consumed by the vibration damper. The third calculation module calculates different... The minimum energy consumption conditions that the installation of vibration dampers for electrical wires with different cross-sectional areas must meet include the number, type, and installation location of the dampers. A module is used to find the minimum electrical wire fatigue damage conditions when the cross-sectional area, number, type, and installation location of the vibration dampers are minimized based on finite element analysis. A third module is used to acquire the actual on-site layout of the vibration dampers, including their number, type, and installation location. A judgment module compares the actual on-site layout with the minimum electrical wire fatigue damage conditions when the cross-sectional area, number, type, and installation location of the vibration dampers are minimized to determine whether the on-site layout conforms to the experimental conclusions.

[0126] Furthermore, the first calculation module is also used to: input the basic parameters of the wire and the wind excitation force of the line in which the wire is located into the vibration dynamic equation, and obtain the power of the wind load input to the wire, the power consumed by the wire's self-damping, and the power consumed by the vibration damper. The vibration dynamic equation of the wire is as follows:

[0127]

[0128] In the formula, x is the coordinate along the direction of the power line, y is the coordinate of the vertical displacement of the power line vibration, t is time, m is the mass per unit length of the power line, c is the self-damping coefficient of the power line, T is the average running tension of the power line, EJ is the bending stiffness of the power line itself, and p(x,t) is the wind excitation force per unit length, and in the formula, The bending moment of the wire cross section is

[0129] Furthermore, the third calculation module is also used to: calculate the energy consumption of the vibration damper using an energy consumption calculation formula, and determine the number and location of the vibration damper to be installed based on its energy consumption. The energy consumption calculation formula is as follows:

[0130] Pd =πf|F||y|sinα(A / A0) 2

[0131] In the formula, P d The energy consumption of the vibration damper is represented by f, the vibration frequency, F, the force exerted by the vibration damper clamp on the wire, F,y, the vertical displacement of the vibration damper clamp head, α, the angle between the vibration damper clamp and the wire, A, the maximum amplitude of the vibration damper clamp, and A0, the initial amplitude of the vibration damper clamp relative to the wire when it is in equilibrium.

[0132] Furthermore, the third calculation module is also used to calculate the installation distance of the vibration damper according to the following formula:

[0133]

[0134] In the formula: S is the installation distance, λ m λ is the wavelength of maximum vibration. n It is the minimum vibration wavelength.

[0135] This invention also provides a storage medium, which includes a stored program, wherein, when the program is running, the device containing the storage medium executes the aforementioned method for studying the mechanical characteristics of transmission lines.

[0136] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0137] In addition, the functional modules in the various embodiments of the present invention can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0138] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory, random access memory, magnetic disks, or optical disks.

[0139] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0140] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

[0141] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A method for studying the mechanical characteristics of transmission lines, characterized in that, include: Step S1: Obtain the basic parameters of the wire, wherein the basic parameters of the wire include the mass per unit length of the wire, the self-damping coefficient, the average running tension, and the bending stiffness of the wire itself. Step S2: Obtain the wind excitation force along the line where the power line is located; Step S3: Based on the basic parameters of the wire and the wind excitation force of the line where the wire is located, calculate the power of the wind load input to the wire, the power consumed by the wire's self-damping, and the power consumed by the vibration damper. Step S4: Calculate the theoretical service life of the transmission line based on the power of the wind load input to the power line, the power consumed by the self-damping of the power line, and the power consumed by the vibration damper. Step S5: Based on steps S1 to S4 above, calculate the minimum energy consumption conditions that the installation of vibration dampers for wires with different cross-sectional areas needs to meet, wherein the installation of vibration dampers includes the number, type and installation location of vibration dampers. Step S6: Based on finite element analysis, determine the wire cross-sectional area, the number, type, and installation location of vibration dampers when the fatigue damage of the wire is minimized. Step S7: Obtain the actual layout of the vibration dampers on site, wherein the actual layout of the vibration dampers on site includes the number, type and installation location of the vibration dampers on site; Step S8: Compare the actual layout of the vibration dampers on site with the cross-sectional area of ​​the wire, the number, type, and installation location of the vibration dampers when the fatigue damage of the wire is minimized, and determine whether the layout of the vibration dampers on site conforms to the experimental conclusion.

2. The method for studying the mechanical characteristics of transmission lines according to claim 1, characterized in that, The steps of calculating the power of the wind load input to the wire, the power consumed by the wire's self-damping, and the power consumed by the vibration damper based on the basic parameters of the wire and the wind excitation force of the line where the wire is located include: By inputting the basic parameters of the power line and the wind excitation force of the line into the vibration dynamic equation, the power of the wind load input to the power line, the power consumed by the power line's self-damping, and the power consumed by the vibration damper are obtained. The vibration dynamic equation of the power line is as follows: In the formula, x is the coordinate along the direction of the power line, y is the coordinate of the vertical displacement of the power line vibration, t is time, m is the mass per unit length of the power line, c is the self-damping coefficient of the power line, T is the average running tension of the power line, EJ is the bending stiffness of the power line itself, and p(x,t) is the wind excitation force per unit length, and in the formula, The bending moment of the wire section is 3. The method for studying the mechanical characteristics of transmission lines according to claim 2, characterized in that, In step S5: Based on steps S1 to S4 above, calculate the minimum energy consumption conditions that the installation of vibration dampers for wires with different cross-sectional areas must meet. The installation of the vibration dampers includes steps related to the quantity, type, and installation location of the dampers, specifically: The energy consumption of the vibration damper is calculated using the energy consumption calculation formula, wherein the energy consumption calculation formula is: P d =πf|F||y|sinα(A / A0) 2 In the formula, P d The energy consumption of the vibration damper is represented by f, the vibration frequency, F, the force exerted by the vibration damper clamp on the wire, F,y, the vertical displacement of the vibration damper clamp head, α, the angle between the vibration damper clamp and the wire, A, the maximum amplitude of the vibration damper clamp, and A0, the initial amplitude of the vibration damper clamp relative to the wire when it is in equilibrium. Based on the energy consumption of the vibration damper, determine the number and location of the vibration dampers to be installed.

4. The method for studying the mechanical characteristics of transmission lines according to claim 3, characterized in that, The step of determining the number and location of vibration dampers based on their energy consumption includes: Calculate the installation distance of the vibration damper using the following formula: In the formula: S is the installation distance, λ m λ is the wavelength of maximum vibration. n It is the minimum vibration wavelength.

5. A device for studying the mechanical characteristics of transmission lines, characterized in that, include: First acquisition module: The first acquisition module is used to acquire the basic parameters of the wire, wherein the basic parameters of the wire include the mass per unit length of the wire, the self-damping coefficient, the average operating tension, and the bending stiffness of the wire itself. Second acquisition module: The second acquisition module is used to acquire the wind excitation force of the line where the power line is located; First calculation module: The first calculation module is used to calculate the power of wind load input to the wire, the power consumed by the wire's self-damping, and the power consumed by the vibration damper based on the basic parameters of the wire and the wind excitation force of the line where the wire is located. Second calculation module: The second calculation module is used to calculate the theoretical service life of the transmission line based on the power of the wind load input wire, the power consumed by the self-damping of the wire, and the power consumed by the vibration damper. The third calculation module is used to calculate the minimum energy consumption conditions that the installation of anti-vibration hammers for wires with different cross-sectional areas needs to meet according to the above steps S1 to S4. The installation of the anti-vibration hammers includes the number, type and installation position of the anti-vibration hammers. Find out module: The find out module is used to find out the cross-sectional area of ​​the wire and the number, type and installation position of the vibration dampers when the fatigue damage of the wire is minimized based on finite element analysis; The third acquisition module is used to acquire the actual layout of the vibration dampers on site, wherein the actual layout of the vibration dampers on site includes the number, type and installation location of the vibration dampers on site. Judgment Module: The judgment module is used to compare the actual on-site arrangement of vibration dampers with the cross-sectional area of ​​the wire, the number, type, and installation position of the vibration dampers when the wire fatigue damage is minimized, and to determine whether the on-site arrangement of vibration dampers conforms to the experimental conclusion.

6. The device for studying the mechanical characteristics of transmission lines according to claim 5, characterized in that, The first calculation module is also used for: By inputting the basic parameters of the power line and the wind excitation force of the line into the vibration dynamic equation, the power of the wind load input to the power line, the power consumed by the power line's self-damping, and the power consumed by the vibration damper are obtained. The vibration dynamic equation of the power line is as follows: In the formula, x is the coordinate along the direction of the power line, y is the coordinate of the vertical displacement of the power line vibration, t is time, m is the mass per unit length of the power line, c is the self-damping coefficient of the power line, T is the average running tension of the power line, EJ is the bending stiffness of the power line itself, and p(x,t) is the wind excitation force per unit length, and in the formula, The bending moment of the wire section is 7. The device for studying the mechanical characteristics of transmission lines according to claim 6, characterized in that, The third calculation module is also used for: The energy consumption of the vibration damper is calculated using the energy consumption calculation formula, wherein the energy consumption calculation formula is: P d =πf|F||y|sinα(A / A0) 2 In the formula, P d The energy consumption of the vibration damper is represented by f, the vibration frequency, F, the force exerted by the vibration damper clamp on the wire, F,y, the vertical displacement of the vibration damper clamp head, α, the angle between the vibration damper clamp and the wire, A, the maximum amplitude of the vibration damper clamp, and A0, the initial amplitude of the vibration damper clamp relative to the wire when it is in equilibrium. Based on the energy consumption of the vibration damper, determine the number and location of the vibration dampers to be installed.

8. The device for studying the mechanical characteristics of transmission lines according to claim 7, characterized in that, The third calculation module is also used for: Calculate the installation distance of the vibration damper using the following formula: In the formula: S is the installation distance, λ m λ is the wavelength of maximum vibration. n It is the minimum vibration wavelength.

9. A storage medium, characterized in that, The storage medium includes a stored program, wherein, when the program is executed, the device containing the storage medium is controlled to perform the method for studying the mechanical characteristics of transmission lines as described in any one of claims 1-4.

10. A server, characterized in that, The system includes a memory and a processor. The memory stores a program for studying the mechanical characteristics of transmission lines. When the processor reads and executes the program, it implements the method for studying the mechanical characteristics of transmission lines as described in any one of claims 1-4.

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