Calculation Method for Effective Rated Dynamic Load of Track Climbing Mechanism Based on Finite Element Analysis

Abstract

The present invention discloses a method for calculating the effective rated dynamic load of an orbital climbing mechanism based on finite element analysis. The present invention relates to the technical field of orbital climbing mechanisms. The method includes the following steps: obtaining the self-mass and carried mass of the orbital climbing mechanism, establishing a finite element analysis model, and setting the structural material and surface area of the mechanism. Based on the self-mass and carried mass, calculating the static load, obtaining the effective windward area through finite element analysis, and then calculating the wind force additional load. Analyzing the initial friction coefficient between the orbital climbing mechanism and the track to be climbed, correcting the coefficient according to the climbing environment parameters, and calculating the friction additional load. Analyzing the vibration characteristic parameters of the mechanism, calculating the vibration acceleration, and thereby obtaining the vibration additional load. Combining the moving acceleration and comprehensively considering the vibration additional load to determine the effective rated dynamic load of the orbital climbing mechanism. An effective load calculation scheme is provided to ensure the safety and reliability of the climbing mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of track climbing mechanisms, and specifically to a method for calculating the effective rated dynamic load of a track climbing mechanism based on finite element analysis. Background Art

[0002] The iron towers of transmission lines bear the load of the transmission lines and their own self-weight, and at the same time can ensure the insulation of the transmission lines from the ground. Generally, the higher the voltage level of the transmission line, the higher the height of the corresponding line iron tower. Common high-voltage towers are generally 25-40 meters, and for the iron towers in the large-span section of the transmission line, whether in the form of tension or straight lifting, their tower height is higher than that of the iron towers of general lines.

[0003] Traditional lifting tools are not suitable for transporting operators carrying tools to climb the tower for operation. Operators can only climb the tower bare-handed. For iron towers with a height exceeding 100 meters, climbing bare-handed not only takes a long time, but also consumes a great deal of physical strength of the operators, seriously affecting work efficiency. In the face of iron towers that are difficult to climb, especially in harsh weather conditions, the difficulty of workers climbing bare-handed can be imagined. It not only cannot ensure the safety of climbing the tower, but also greatly hinders the efficiency of tower climbing operations.

[0004] Traditional load calculation methods for track climbing mechanisms mostly rely on simplified models or empirical formulas. Although these methods can estimate the load to a certain extent, they cannot fully consider complex working conditions. For example, factors such as changes in wind speed in the environment, changes in friction coefficients during the climbing process, and changes in the self-vibration characteristics of the mechanism may all have a significant impact on the actual load of the mechanism. Moreover, since the operation process of the track climbing mechanism is often accompanied by certain vibrations, accelerations and other dynamic responses, these dynamic loads are often ignored in traditional static calculations, resulting in certain errors in the calculation results, thus affecting the design safety and accuracy of the mechanism.

[0005] Therefore, how to accurately calculate and evaluate various loads suffered by the track climbing mechanism in the actual working environment is an important technical problem to ensure its reasonable design, structural safety and reliability.

[0006] In the prior art, the published number CN117077489A discloses a method for calculating the effective rated dynamic load of a roller bearing based on finite element analysis. By obtaining the basic structural parameters of the roller bearing, establishing a roller bearing model in a parametric 3D modeling software, inputting the roller bearing model into the finite element analysis software, performing pre-processing, and carrying out dynamic analysis, the actual load distribution angle and the input load distribution angle are obtained and input into a mathematical model to calculate the effective rated dynamic load of the roller bearing. The method based on finite element analysis simulates the actual working load-bearing condition of the roller bearing, outputs the real load distribution angle, and thus calculates the effective rated dynamic load of the roller bearing more accurately. However, in reality, bearings are often affected by external factors such as vibration, temperature change, and load fluctuation, and the changes of these factors have a profound impact on the load distribution and bearing life. More complex multi-physical field coupling analysis needs to be carried out, otherwise it may lead to underestimation or overestimation of the results; at the same time, the loading angle may change due to factors such as lubrication state and temperature change of the bearing, and these dynamic changes may not be fully and accurately reflected in the finite element model. Therefore, the accuracy and effectiveness of the calculated effective rated dynamic load are reduced.

[0007] The above information disclosed in the background art section is only used to enhance the understanding of the background of the present disclosure, and thus it may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0008] The purpose of the present invention is to provide a method for calculating the effective rated dynamic load of a track climbing mechanism based on finite element analysis to solve the problems raised in the above background art.

[0009] To achieve the above purpose, the present invention provides the following technical solutions:

[0010] A method for calculating the effective rated dynamic load of a track climbing mechanism based on finite element analysis, the specific steps include:

[0011] Obtain the self-mass and carried mass of the track climbing mechanism, establish a finite element analysis model, input the set self-mass and carried load of the track climbing mechanism, and set the structural material and surface area of the track climbing mechanism in the established model;

[0012] Based on the self-mass and carried mass of the track climbing mechanism, calculate the static load of the track climbing mechanism. Based on the surface area of the track climbing mechanism, through the finite element analysis model, analyze and obtain the effective windward area when the track climbing mechanism climbs, and calculate the wind force additional load based on the effective windward area;

[0013] Based on the finite element analysis model, the initial friction coefficient between the track climbing mechanism and the track to be climbed is obtained. Combining the climbing environment parameters, the initial friction coefficient is corrected to obtain the dynamic friction coefficient, and the friction additional load is calculated based on the dynamic friction coefficient.

[0014] Based on the finite element analysis model, the vibration characteristic parameters of the overall mechanism during the climbing process of the track climbing mechanism are obtained. The vibration acceleration of the mechanism is calculated through the vibration characteristic parameters, and the vibration additional load is calculated based on the vibration acceleration. The vibration characteristic parameters include the vibration frequency and amplitude of the mechanism.

[0015] The acceleration load is calculated based on the moving acceleration during the climbing process of the track climbing mechanism. A mathematical analysis model is established, and the effective rated dynamic load of the track climbing mechanism is determined by combining the vibration additional load, the friction additional load, the wind force additional load and the static load.

[0016] Furthermore, a finite element analysis model is established. The specific steps included are: creating a geometric model of the track climbing mechanism, determining the surface area of the track climbing mechanism according to the geometric model, and defining the material properties of each component, including the elastic modulus and Poisson's ratio, for obtaining the initial friction coefficient according to the material property parameters.

[0017] Furthermore, based on the self-mass and carried mass of the track climbing mechanism, the static load of the track climbing mechanism is calculated. The specific formula for calculating the static load of the track climbing mechanism is:

[0018] ;

[0019] In the formula, represents the static load of the track climbing mechanism, is the self-mass of the mechanism, is the rated carried mass of the mechanism, is the acceleration due to gravity;

[0020] Based on the surface area of the track climbing mechanism, through the finite element analysis model, the effective windward area of the track climbing mechanism during climbing is obtained. The formula for calculating the effective windward area is:

[0021] ;

[0022] In the formula, is the surface area of the track climbing mechanism, is the rated wind direction angle, is the rated effective windward area;

[0023] The wind force additional load is calculated based on the effective windward area. The formula for calculating the wind force additional load is:

[0024] ;

[0025] In the formula, is the wind load addition, is the wind pressure, is the drag coefficient, where the wind pressure is calculated according to the formula:

[0026] ;

[0027] In the formula, is the air density, is the set rated wind speed, where the air density is calculated from the air pressure and the ambient temperature, and the specific calculation formula is:

[0028] ;

[0029] In the formula, is the air pressure at the rated working altitude ; is the ideal gas constant, is the rated ambient temperature, where the air pressure at the altitude of is calculated according to the formula:

[0030] ;

[0031] In the formula, is the standard air pressure at sea level, is the molar mass of air, represents the rated altitude where the track climbing mechanism is located.

[0032] Furthermore, based on the finite element analysis model, the initial friction coefficient between the track climbing mechanism and the track to be climbed is analyzed, and the initial friction coefficient is corrected in combination with the climbing environment parameters to obtain the dynamic friction coefficient. The logic for obtaining the initial friction coefficient is: the initial friction coefficient is determined by the structural material of the track climbing mechanism and the material of the track to be climbed. The formula for calculating the dynamic friction coefficient is:

[0033] ;

[0034] In the formula, is the initial friction coefficient, is the dynamic friction coefficient, is the rated ambient humidity, and are the weight coefficients of the rated ambient humidity and the ambient temperature, where and ​​All are greater than 0.

[0035] Furthermore, the formula for calculating the friction additional load based on the dynamic friction coefficient is:

[0036] ;

[0037] In the formula, is the friction additional load.

[0038] Furthermore, based on the finite element analysis model, the vibration characteristic parameters of the overall mechanism during the climbing process of the track climbing mechanism are analyzed, and the vibration acceleration of the mechanism is calculated through the vibration characteristic parameters. The formula for calculating the vibration acceleration is:

[0039] ;

[0040] In the formula, is the effective value of the vibration acceleration at N time points, is the vibration acceleration at the t-th time point collected, is the total number of the collected time points, t is the index of the time point, and ;

[0041] Among them, the formula for calculating the vibration acceleration is:

[0042] ;

[0043] In the formula, is the rated vibration amplitude of the overall mechanism during the climbing process of the track climbing mechanism, is the rated vibration frequency of the overall mechanism during the climbing process of the track climbing mechanism, where is obtained by correcting the collected initial vibration frequency in combination with the rated surface temperature of the mechanism. The specific formula is:

[0044] ;

[0045] In the formula, is the initial vibration frequency, is the temperature correction constant, is the rated surface temperature of the track climbing mechanism, is the standard reference temperature;

[0046] The formula for calculating the vibration additional load based on the vibration acceleration is:

[0047] ;

[0048] In the formula, is the vibration additional load, is the self - mass of the mechanism, is the carrying mass of the mechanism.

[0049] Furthermore, based on the moving acceleration during the climbing process of the track climbing mechanism, the acceleration load is calculated, and the formula for calculating the acceleration load is:

[0050] ;

[0051] In the formula, is the acceleration load, is the rated moving acceleration of the track climbing mechanism;

[0052] A mathematical analysis model is established, and the effective rated dynamic load of the track climbing mechanism is determined by combining the vibration additional load, friction additional load, wind force additional load and static load. The formula for calculating the effective rated dynamic load of the track climbing mechanism is:

[0053] ;

[0054] In the formula, , and are the friction additional load, wind force additional load and static load respectively.

[0055] Compared with the prior art, the beneficial effects of the present invention are:

[0056] First of all, by establishing a detailed finite - element analysis model and inputting basic parameters such as the structural material, surface area, and carrying mass of the track climbing mechanism, the comprehensive effects of various static and dynamic factors can be fully considered. This method can accurately simulate the stress state of the mechanism in the real working environment, avoiding the possible simplifying assumptions and underestimation problems in the traditional methods. Secondly, through accurately calculating the static load, wind force additional load, friction additional load, and vibration additional load, the multiple loads on the track climbing mechanism can be evaluated in a dynamic environment. The wind force additional load can be estimated under different wind speed conditions, so as to adjust the design and working strategy of the track climbing mechanism; at the same time, through the correction of the friction coefficient and combining the parameters during the climbing process, the friction load can be more accurately predicted, further improving the stability and safety during the climbing process. In addition, considering that the track climbing mechanism is often accompanied by vibration and acceleration processes during actual operation, through the analysis of vibration characteristic parameters and combining with the calculation of acceleration load, the response of the mechanism under dynamic working conditions can be comprehensively evaluated. It helps to better understand the stress characteristics of the mechanism under complex working conditions, and then optimize the structural design of the mechanism, enhance its anti - vibration and anti - impact capabilities, thereby improving the safety and working reliability of the track climbing mechanism. Brief Description of the Drawings

[0057] Figure 1This is a schematic diagram of the overall method flow of the present invention. Specific embodiments

[0058] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the following further details the present invention in conjunction with specific embodiments.

[0059] It should be noted that unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meanings understood by those with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar terms used in the present invention do not represent any order, quantity or importance, but are only used to distinguish different components. Words such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to represent relative position relationships, and when the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0060] Embodiment:

[0061] Please refer to Figure 1 , the present invention provides a technical solution:

[0062] A method for calculating the effective rated dynamic load of an orbital climbing mechanism based on finite element analysis, the specific steps include:

[0063] Step 1: Obtain the self-mass and carried mass of the orbital climbing mechanism, establish a finite element analysis model, input the set self-mass and carried load of the orbital climbing mechanism, and set the structural material and surface area of the orbital climbing mechanism in the established model;

[0064] The steps for establishing a finite element analysis model specifically include: creating a geometric model of the orbital climbing mechanism, determining the surface area of the orbital climbing mechanism according to the geometric model, and defining the material properties of each component, including elastic modulus and Poisson's ratio, for obtaining the initial friction coefficient according to the material property parameters.

[0065] Specifically obtain the geometric parameters of the track climbing mechanism, such as length, width, height, thickness of each part, etc. Open the finite element analysis software (such as ANSYS, Abaqus, COMSOL, etc.), and use the drawing tool in the software to draw the three-dimensional model of the climbing mechanism according to the collected geometric dimensions, ensuring that the model accurately reflects the shape and size of the actual structure. Find the material library in the software, create new materials and input the collected material properties. Ensure that the material types used (such as elastic, plastic, composite materials, etc.) are consistent with the actual materials. Apply the gravity load according to the self-weight and carried weight. Set the direction and magnitude of the gravity in the model.

[0066] Step 2: Based on the self-weight and carried weight of the track climbing mechanism, calculate the static load of the track climbing mechanism. Based on the surface area of the track climbing mechanism, analyze and obtain the effective windward area of the track climbing mechanism during climbing through the finite element analysis model, and calculate the additional wind load based on the effective windward area.

[0067] Based on the self-weight and carried weight of the track climbing mechanism, calculate the static load of the track climbing mechanism. The specific formula for calculating the static load of the track climbing mechanism is:

[0068] ;

[0069] In the formula, represents the static load of the track climbing mechanism, is the self-weight of the mechanism, is the rated carried weight of the mechanism, is the acceleration due to gravity. The rated carried weight of the mechanism can be set according to industry and national or international standards. In this design, the rated carried weight of the track climbing mechanism is between 150 kg and 200 kg.

[0070] Based on the surface area of the track climbing mechanism, analyze and obtain the effective windward area of the track climbing mechanism during climbing through the finite element analysis model. The formula for calculating the effective windward area is:

[0071] ;

[0072] In the formula, is the surface area of the track climbing mechanism, is the rated wind direction angle, is the rated effective windward area; the rated wind direction angle is set according to the surface area of the track climbing mechanism, such as set to 50 to 80 , and is determined according to the actual use environment, with a maximum of 1.

[0073] The additional wind load is calculated based on the effective windward area, and the formula for calculating the additional wind load is as follows:

[0074] ;

[0075] In the formula, is the additional wind load, is the wind pressure, is the drag coefficient. The specific acquisition methods include: for objects with common shapes (such as rectangles, cylinders, spheres, etc.), there are a large number of research results and experimental data available for reference. Usually, the corresponding value can be found in monographs or journals on fluid mechanics and aerodynamics, or numerical simulations can be carried out using CFD software (such as ANSYS Fluent, OpenFOAM, COMSOL, etc.) to simulate the flow field around the object and calculate the corresponding drag coefficient. The specific value range is generally between 0.02 and 2.0.

[0076] Among them, the wind pressure is calculated according to the following formula:

[0077] ;

[0078] In the formula, is the air density, is the set rated wind speed, and the set rated wind speed is at least the maximum value of the working environment wind speed.

[0079] Among them, the air density is calculated through the air pressure and the ambient temperature. The specific calculation formula is:

[0080] ;

[0081] In the formula, is the air pressure at the rated working altitude , is the ideal gas constant, is the rated ambient temperature, where the air pressure at the altitude of is calculated according to the following formula:

[0082] ;

[0083] In the formula, is the standard air pressure at sea level, generally 101325 Pa, is the molar mass of air, and the molar mass of air is about 0.029 kg / mol, represents the altitude where the rated track climbing mechanism is located.

[0084] Among them, the rated working altitude is set according to the working height of the track climbing mechanism, and its minimum value is the altitude of the highest working location.

[0085] Step 3: Analyze the initial friction coefficient between the track climbing mechanism and the track to be climbed based on the finite element analysis model, correct the initial friction coefficient in combination with the climbing environment parameters to obtain the dynamic friction coefficient, and calculate the friction additional load based on the dynamic friction coefficient.

[0086] Based on the finite element analysis model, analyze the initial friction coefficient between the track climbing mechanism and the track to be climbed, correct the initial friction coefficient in combination with the climbing environment parameters to obtain the dynamic friction coefficient. The logic for obtaining the initial friction coefficient is: determine the initial friction coefficient through the structural material of the track climbing mechanism and the material of the track to be climbed. The formula for calculating the dynamic friction coefficient is:

[0087] ;

[0088] In the formula, is the initial friction coefficient, is the dynamic friction coefficient, is the rated environmental humidity, and are the weight coefficients of the rated environmental humidity and the environmental temperature, where and and are both greater than 0.

[0089] Among them, the influence of environmental humidity on the friction coefficient is represented by the exponential function When the humidity increases, the contact surface between materials may reduce friction due to the presence of moisture. Therefore, the environmental humidity is inversely proportional to the dynamic friction coefficient. This influence is usually non-linear, so an exponential function is used to reflect the change in humidity on the reduction of the friction coefficient.

[0090] The influence of environmental temperature on the friction coefficient is represented by. The increase in temperature usually leads to changes in the properties of materials, such as plastic deformation and changes in surface lubrication characteristics, thus affecting the friction coefficient. The change in temperature on the friction coefficient is relatively direct. Higher temperatures may cause the material to soften or change its physical properties, thus increasing friction. As the temperature rises, the friction coefficient may increase.

[0091] Among them, the rated environmental humidity and the rated environmental temperature The settings are usually determined based on the device's usage environment, industry standards, device design, and material properties. For electrical equipment, the rated humidity usually refers to international standards such as IEC 60068-2-78, and the rated ambient humidity is typically specified as 90% relative humidity. When operating at high loads, the rated working temperature of the device may be set to 30°C to 40°C, while at low loads, it can be extended to the range of -20°C to 60°C.

[0092] Moreover, since the influence of environmental humidity on friction is more intense and directly affects the frictional force, the setting and and are both greater than 0.

[0093] The formula for calculating the friction additional load based on the dynamic friction coefficient is:

[0094] ;

[0095] In the formula, is the friction additional load.

[0096] Step 4: Analyze the finite element analysis model to obtain the vibration characteristic parameters of the overall mechanism during the climbing process of the track climbing mechanism. Calculate the vibration acceleration of the mechanism through the vibration characteristic parameters, and calculate the vibration additional load based on the vibration acceleration. The vibration characteristic parameters include the vibration frequency and amplitude of the mechanism.

[0097] The method for obtaining the vibration characteristic parameters including the vibration frequency and amplitude of the mechanism is as follows: Conduct modal analysis to extract the vibration frequency and vibration mode (vibration shape) of the mechanism. Select the modal analysis option in the analysis settings. Usually, the characteristic frequency and the corresponding vibration mode can be extracted by selecting the required number of modes. Conduct frequency response analysis, which can provide the system response within a specific frequency range, including the vibration amplitude.

[0098] Analyze the finite element analysis model to obtain the vibration characteristic parameters of the overall mechanism during the climbing process of the track climbing mechanism. Calculate the vibration acceleration of the mechanism through the vibration characteristic parameters. The formula for calculating the vibration acceleration is:

[0099] ;

[0100] In the formula, is the effective value of the vibration acceleration at N time points, is the vibration acceleration at the t-th time point collected, is the total number of time points collected, t is the index of the time point, and ;

[0101] where the vibration acceleration The formula based on the calculation is as follows:

[0102] ;

[0103] In the formula, is the rated vibration amplitude of the overall mechanism during the climbing process of the track climbing mechanism, is the rated vibration frequency of the overall mechanism during the climbing process of the track climbing mechanism.

[0104] represents the maximum displacement at a certain moment, that is, the intensity of vibration. For a dynamic system, this amplitude changes with time, so is used to represent its change with time. As time goes by, the vibration frequency of the system may change, so it is characterized as , which directly affects the calculation of acceleration. is an important factor of vibration acceleration, reflecting the influence of frequency on acceleration. The higher the frequency, the greater the acceleration, represents the phase characteristic of acceleration. A cosine function different from the displacement function is adopted.

[0105] Among them is obtained by correcting the initial vibration frequency collected in combination with the rated surface temperature of the mechanism. The specific formula is as follows:

[0106] ;

[0107] In the formula, is the initial vibration frequency, is the temperature correction constant, is the rated surface temperature of the track climbing mechanism, is the standard reference temperature;

[0108] As the temperature rises, the elastic modulus of many materials will decrease, which means that the materials become softer and the deformation under the same stress will be greater. As the temperature rises, the stiffness of the materials decreases, resulting in greater deformation of the materials under the same load. This increase in deformation means that the natural frequency will decrease. As the temperature rises, the internal friction of the materials usually increases, resulting in changes in damping characteristics. This may cause attenuation of the vibration frequency and affect the persistence and amplitude of vibration. Therefore, temperature is inversely proportional to and represents the correction of the vibration frequency at different temperatures.

[0109] Among them, the standard reference temperature is set by combining the standard temperature with the rated altitude where the track climbing mechanism is located and the rated wind speed . The specific formula is as follows:

[0110] ;

[0111] In the formula, is the standard temperature, generally 20 to 25 , where the rated altitude and the rated wind speed of the track climbing mechanism are both proportional to the standard reference temperature . The specific reason is that the higher the altitude, the lower the average temperature, and the surface temperature of the track climbing mechanism can dissipate heat quickly. Therefore, in order to maintain the sensitivity of the correction, the standard reference temperature should be reduced. The influence of wind speed on the standard reference temperature is the same. The greater the wind speed, the better the heat dissipation effect. Therefore, it is necessary to reduce the standard reference temperature , that is, the greater the wind speed , the smaller the standard reference temperature .

[0112] The formula for calculating the vibration additional load based on the vibration acceleration is:

[0113] ;

[0114] In the formula, is the vibration additional load, is the self - mass of the mechanism, is the carried mass of the mechanism.

[0115] Step 5: Calculate the acceleration load based on the moving acceleration during the climbing process of the track climbing mechanism, establish a mathematical analysis model, and determine the effective rated dynamic load of the track climbing mechanism by combining the vibration additional load, friction additional load, wind force additional load and static load.

[0116] Calculate the acceleration load based on the moving acceleration during the climbing process of the track climbing mechanism. The formula for calculating the acceleration load is:

[0117] ;

[0118] In the formula, is the acceleration load, is the rated moving acceleration of the track climbing mechanism, where the rated moving acceleration is determined according to the usage function, working nature and load condition of the equipment. For example, a fast - transmission system may require a higher acceleration, while a precision positioning device may require a smaller acceleration to ensure stability. The general setting range of the rated moving acceleration of the track climbing mechanism is 1m / s² to 2m / s².

[0119] A mathematical analysis model is established to determine the effective rated dynamic load of the track climbing mechanism by combining the vibration additional load, friction additional load, wind additional load and static load. The formula for calculating the effective rated dynamic load of the track climbing mechanism is as follows:

[0120] ;

[0121] In the formula, 、 and are the friction additional load, wind additional load and static load respectively.

[0122] The above formulas are all dimensionless and take their numerical values for calculation. The formula is obtained by collecting a large amount of data for software simulation to get a formula closest to the actual situation. The preset parameters in the formula are set by those skilled in the art according to the actual situation.

[0123] The above embodiments can be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in this article can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software methods depends on the specific application and design constraints of the technical solution.

[0124] The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units. They can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0125] The above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application, and all of them should be covered by the protection scope of this application.

Claims

1. A method for calculating the effective rated dynamic load of a track climbing mechanism based on finite element analysis, characterized in that: The specific steps include: Obtain the self-mass and carrying mass of the track climbing mechanism, establish a finite element analysis model, input the set self-mass and carrying load of the track climbing mechanism, and set the structural material and surface area of ​​the track climbing mechanism in the established model; Based on the mass of the track climbing mechanism and the carrying mass, the static load of the track climbing mechanism is calculated. Based on the surface area of ​​the track climbing mechanism, the effective windward area of ​​the track climbing mechanism during climbing is analyzed and obtained through the finite element analysis model. The additional wind load is calculated based on the effective windward area. The specific formula for calculating the static load of the track climbing mechanism is: F static =(n self +m load )*g In the formula, F static represents the static load of the track climbing mechanism, m self is the quality of the institution itself, m load is the rated carrying mass of the mechanism, g is the acceleration due to gravity; Based on the surface area of ​​the track climbing mechanism, the effective windward area of ​​the track climbing mechanism during climbing is analyzed and obtained through the finite element analysis model. The formula for calculating the effective windward area is: A eff =A*cosθ Where A is the surface area of ​​the track climbing mechanism, θ is the rated wind direction angle, and A eff is the rated effective frontal area; The additional wind load is calculated based on the effective windward area, where the formula for calculating the additional wind load is: F wind =P wind *A eff *C d In the formula, F wind is the additional wind load, P wind is wind pressure, C d is the drag coefficient, where wind pressure P wind The calculation is based on the formula: In the formula, ρ is the air density, V is the set rated wind speed, and the air density ρ is calculated by air pressure and ambient temperature. The specific calculation formula is: Where P(h) is the air pressure at the rated working altitude h, R is the ideal gas constant, and T is the rated ambient temperature. The air pressure P(h) at the altitude h is calculated based on the formula: Where P0 is the standard air pressure at sea level, M is the molar mass of air, and h represents the rated altitude of the track climbing mechanism; The initial friction coefficient between the track climbing mechanism and the track to be climbed is obtained based on the finite element analysis model, and the initial friction coefficient is corrected in combination with the climbing environment parameters to obtain the dynamic friction coefficient, and the friction additional load is calculated based on the dynamic friction coefficient; The logic for obtaining the initial friction coefficient is as follows: the initial friction coefficient is determined by the structural material of the track climbing mechanism and the material of the track to be climbed, and the formula for calculating the dynamic friction coefficient is: Where, μ0 is the initial friction coefficient, μ′ is the dynamic friction coefficient, H is the rated ambient humidity, k H and k T is the weight coefficient of rated ambient humidity and ambient temperature, where k H >k T And k H and k T All are greater than 0; The formula for calculating the additional friction load based on the dynamic friction coefficient is: F fri =μ′*(m self +m load ) In the formula, F fri Additional load for friction; The vibration characteristic parameters of the whole mechanism of the track climbing mechanism during the climbing process are obtained based on the finite element analysis model, the vibration acceleration of the mechanism is calculated through the vibration characteristic parameters, and the vibration additional load is obtained based on the vibration acceleration calculation, wherein the vibration characteristic parameters include the vibration frequency and amplitude of the mechanism; The acceleration load is calculated based on the movement acceleration of the track climbing mechanism during the climbing process, and a mathematical analysis model is established. The effective rated dynamic load of the track climbing mechanism is determined by combining the vibration additional load, friction additional load, wind additional load and static load.

2. The method for calculating the effective rated dynamic load of a track climbing mechanism based on finite element analysis according to claim 1 is characterized in that: A finite element analysis model is established, which specifically includes the following steps: creating a geometric model of the track climbing mechanism, determining the surface area of ​​the track climbing mechanism based on the geometric model, and defining the material properties of each component, including elastic modulus and Poisson's ratio, which are used to obtain the initial friction coefficient based on the material property parameters.

3. The method for calculating the effective rated dynamic load of a track climbing mechanism based on finite element analysis according to claim 1, characterized in that: Based on the finite element analysis model, the vibration characteristic parameters of the entire mechanism during the climbing process of the track climbing mechanism are obtained, and the vibration acceleration of the mechanism is calculated by the vibration characteristic parameters. The formula for calculating the vibration acceleration is: In the formula, a rms is the effective value of vibration acceleration at N time points, a zdi is the vibration acceleration collected at the tth time point, N is the total number of collected time points, t is the index of the time point, and t∈[1,N]; The vibration acceleration a zdt The calculation is based on the formula: a zdt =A*{2πf} 2 *cos(2πf) Where A is the rated vibration amplitude of the entire mechanism during the climbing process of the track climbing mechanism, and f is the rated vibration frequency of the entire mechanism during the climbing process of the track climbing mechanism, where f is obtained based on the collected initial vibration frequency combined with the rated surface temperature correction of the mechanism. The specific formula is: f=f0*{1-β*(T S -T0)} Where f0 is the initial vibration frequency, β is the temperature correction constant, T S is the rated surface temperature of the track climbing mechanism, T0 is the standard reference temperature; The formula for calculating the vibration additional load based on vibration acceleration is: F dyn =(m self +m load )*a rms In the formula, F dyn is the vibration additional load, m self is the quality of the institution itself, m load For the carrying quality of the institution.

4. The method for calculating the effective rated dynamic load of a track climbing mechanism based on finite element analysis according to claim 3 is characterized in that: The acceleration load is calculated based on the movement acceleration of the track climbing mechanism during the climbing process, wherein the formula for calculating the acceleration load is: F add =(m self +m olad )*a dt In the formula, F add is the acceleration load, a dt is the rated moving acceleration of the track climbing mechanism; A mathematical analysis model is established to determine the effective rated dynamic load of the track climbing mechanism by combining the vibration additional load, friction additional load, wind additional load and static load. The formula for calculating the effective rated dynamic load of the track climbing mechanism is: F total =F add +F dyn +F fri +F wind +F static In the formula, F fri 、F wind and F static They are friction additional load, wind additional load and static load respectively.

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