Arrangement method of novel rigid contact network with carbon slide plate even in abrasion
The particle swarm algorithm optimizes the surface unevenness of the carbon skateboard and determines the layout trajectory of the contact line, solving the problem of uneven wear of the carbon skateboard in the rigid contact network system, achieving the effects of uniform wear, extended service life and improved bow net relationship.
Patent Information
- Application Number
- CN202411897909.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-05-30
AI Technical Summary
In the rail transit system, the carbon skateboards of the rigid contact network system are not uniformly worn, resulting in the formation of local grooves, and the construction is difficult and costly.
The particle swarm algorithm optimizes the surface unevenness of the carbon skateboard and determines the layout trajectory of the contact line to slow down the wear rate of the carbon skateboard and extend its service life.
It greatly reduces the unevenness and maximum wear of the surface wear of carbon skateboards, extends the service life of carbon skateboards, improves the bow net relationship, improves the economy, and reduces the probability of arcing between bow nets.
Smart Images
Figure CN120068573A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of catenary power supply, and particularly to a new rigid catenary layout method with uniform wear of carbon skateboards. Background Art
[0002] In the actual application of the current rail transit system, the rigid catenary system often has problems of uneven wear and local grooves of the pantograph carbon skateboard. Although the change rate of the stagger value of the contact wire arranged in a single Z shape is basically constant, its value is low, resulting in serious wear of the carbon skateboard at the anchor section joint under the single Z-shaped layout. Although the change rate of the stagger value of the contact wire arranged in a single sine wave shape is relatively high, its value changes greatly, and there is a phenomenon that the change rate of the stagger value drops sharply at the maximum stagger value, resulting in uneven wear of the carbon skateboard. In particular, obvious grooves are formed on both sides of the maximum stagger value of the skateboard, and the construction difficulty of the sine wave layout is large and the construction cost is high. Therefore, how to achieve uniform wear of the carbon skateboard has become a technical problem to be solved. Summary of the Invention
[0003] The purpose of the present invention is to provide a new rigid catenary layout method with uniform wear of carbon skateboards according to the deficiencies of the above-mentioned prior art. By using the particle swarm optimization algorithm, the coordinate points of the stagger value with the minimum unevenness on the surface of the carbon skateboard are solved, and then the layout trajectory of the contact wire is determined, which can greatly slow down the wear rate of the carbon skateboard, extend its service life, and help improve the pantograph-catenary relationship.
[0004] The purpose of the present invention is achieved by the following technical solutions:
[0005] A new rigid catenary layout method with uniform wear of carbon skateboards includes the following steps:
[0006] Construct the unevenness on the surface of the carbon skateboard as the objective function;
[0007] Set the constraint conditions of the objective function, and the constraint conditions include the anchor section length of the rigid catenary, the stagger value of the contact wire, the wavelength range of the layout trajectory of the contact wire, and the operating conditions of the carbon skateboard;
[0008] Use the particle swarm optimization algorithm to optimize and calculate the objective function to obtain the coordinate points of the stagger value that minimize the unevenness on the surface of the carbon skateboard;
[0009] Determine the layout trajectory of the contact wire according to the coordinate points of the stagger value.
[0010] The step of constructing the unevenness on the surface of the carbon skateboard as the objective function includes:
[0011] The contact area on the carbon sliding plate that contacts the contact wire is equally spaced in the length extension direction of the carbon sliding plate to obtain a number of measurement points;
[0012] Obtain the thickness of the carbon sliding plate at each of the measurement points, and calculate the variance of the thicknesses of the carbon sliding plates;
[0013] Take the variance as the surface unevenness of the carbon sliding plate.
[0014] The step of using the particle swarm algorithm to optimize and calculate the objective function to obtain the coordinate point of the pull-out value that minimizes the surface unevenness of the carbon sliding plate includes:
[0015] Use the particle swarm algorithm to optimize and calculate the objective function until the surface unevenness of the carbon sliding plate is less than a preset value;
[0016] Output the coordinate point of the pull-out value that minimizes the surface unevenness of the carbon sliding plate.
[0017] The formulas for the velocity and position of particles in the particle swarm algorithm are as follows:
[0018]
[0019]
[0020] Among them, is the particle flight speed, is the position of the particle, is the current best position of the particle, is the historical best position of the particle, t is the number of iterations, r 1 、r 2 are random numbers between [0, 1], used to increase the randomness of the search, c 1 、c 2 are learning factors, and ω is the inertia weight.
[0021] The step of determining the layout track of the contact wire according to the coordinate point of the pull-out value includes:
[0022] According to the coordinate point of the pull-out value, determine a plurality of target positioning points within a quarter wavelength range of the layout track of the contact wire, and the target positioning points are the positioning points of the busbar for fixing the contact wire;
[0023] According to the plurality of target positioning points, determine the layout form of the busbar.
[0024] The step of determining the layout form of the busbar according to the plurality of target positioning points includes:
[0025] If the target positioning points within the length range of the busbar can be sequentially connected into a line segment, a straight busbar is arranged along the target positioning points that can be sequentially connected into a line segment;
[0026] If the target positioning points within the length range of the busbar cannot be sequentially connected into a line segment, the busbar is bent according to the target positioning points, and the bent busbar is arranged along the target positioning points.
[0027] The target positioning points include the maximum pull-out value coordinate points. The step of determining the layout trajectory of the contact wire according to the pull-out value coordinate points includes:
[0028] The busbars on both sides of the maximum pull-out value coordinate points are arranged in a broken line form.
[0029] The advantages of the present invention are as follows: The unevenness and the maximum wear amount of the surface of the carbon slide plate are significantly reduced, which is beneficial to extending the service life of the carbon slide plate, improving the pantograph-catenary relationship, and enhancing the economy of using the carbon slide plate and the contact wire. The carbon slide plate with uniform wear can also reduce the occurrence probability of arcs between the pantograph and the catenary, which is beneficial to the safe and stable operation of the pantograph-catenary. Description of the Drawings
[0030] Figure 1 It is a schematic flow chart of a new type of rigid catenary layout method with uniform wear of the carbon slide plate in the present invention;
[0031] Figure 2 It is a schematic diagram of the division of measurement points in the surface contact area of the carbon slide plate in the present invention;
[0032] Figure 3 It is a schematic diagram of the parameter settings of the particle swarm optimization algorithm in the present invention;
[0033] Figure 4 It is a schematic flow chart of using the particle swarm optimization algorithm to find the unevenness of the carbon slide plate surface in the present invention;
[0034] Figure 5 It is a schematic diagram of the pull-out value coordinates in the present invention;
[0035] Figure 6 It is a schematic diagram of the layout trajectory of the contact wire in the present invention. Detailed Embodiments
[0036] The features of the present invention and other related features are further described in detail below with reference to the accompanying drawings through embodiments for the understanding of those skilled in the same industry:
[0037] Embodiment: As Figures 1-6 shown, this embodiment relates to a new type of rigid catenary layout method with uniform wear of the carbon slide plate, and this method includes the following steps:
[0038] Step 11: Construct the surface unevenness of the carbon skateboard as the objective function;
[0039] In this embodiment, the surface unevenness of the carbon skateboard is used as the optimization objective, that is, the surface unevenness of the carbon skateboard is used to describe the wear distribution on the surface of the carbon skateboard. The greater the surface unevenness of the carbon skateboard, the more uneven the wear distribution on the surface of the carbon skateboard.
[0040] Step 12: Set the constraint conditions of the objective function, where the constraint conditions include the section length of the rigid catenary, the stagger value of the contact wire, the wavelength range of the layout trajectory of the contact wire, and the operating conditions of the carbon skateboard.
[0041] After establishing the objective function, further, relevant constraint conditions need to be set, including the section length of the rigid catenary, the stagger value of the contact wire, the wavelength range of the layout trajectory of the contact wire, and the operating conditions of the carbon skateboard movement, etc. Among them, the wavelength range of the layout trajectory of the contact wire refers to taking the layout trajectory of the contact wire as a waveform, the wavelength range in this waveform, or the wavelength range of the smallest repeating unit in this waveform. And the operating conditions of the carbon skateboard movement include the moving speed, etc.
[0042] Step 13: Use the particle swarm optimization algorithm to perform optimization calculation on the objective function to obtain the stagger value coordinate point where the surface unevenness of the carbon skateboard reaches the minimum;
[0043] In this embodiment, the particle swarm optimization algorithm (PSO) is specifically used to perform optimization calculation on the objective function to find the stagger value coordinate point where the surface unevenness of the carbon skateboard reaches the minimum. Optionally, the above constraint conditions further include the constraints on the particle velocity and position boundaries. By setting the parameters of the algorithm, calculating the particle position and velocity, and then updating the individual optimal and global optimal, finally, the surface unevenness of the carbon skateboard is made less than the preset value, and the stagger value coordinate point where the surface unevenness of the carbon skateboard reaches the minimum is obtained.
[0044] Step 14: Determine the layout trajectory of the contact wire according to the stagger value coordinate point.
[0045] After obtaining the stagger value coordinate points, the layout trajectory of the contact wire can be determined according to these stagger value coordinate points. Under this layout trajectory of the contact wire, the surface unevenness of the carbon skateboard is the smallest.
[0046] Exemplarily, all the stagger value coordinate points can be connected to form a layout trajectory of the contact wire that fluctuates around the center line of the line, that is, an approximate "double-sine waveform" layout of the contact wire around the center line of the line within one section is obtained.
[0047] Thus, in this embodiment, by using the particle swarm optimization algorithm to solve the coordinate points of the pull-out value with the minimum surface unevenness of the carbon skateboard, and then determining the layout trajectory of the contact wire, the advantages of significantly slowing down the wear rate of the carbon skateboard and extending its service life can be achieved, which helps to improve the pantograph-catenary relationship.
[0048] In some embodiments, the step of constructing the surface unevenness of the carbon skateboard as the objective function includes:
[0049] Equally spaced division is performed on the contact area of the carbon skateboard that contacts the contact wire in the length extension direction of the carbon skateboard to obtain a number of measurement points;
[0050] Obtain the thickness of the carbon skateboard at each of the measurement points, and calculate the variance of the thicknesses of the carbon skateboards;
[0051] Take the variance as the surface unevenness of the carbon skateboard.
[0052] As Figure 2 shown, that is to say, in this embodiment, the contact area of the carbon skateboard that contacts the contact wire is equally divided to obtain a number of measurement points, that is, as Figure 2 points a, b, and c in, then measure the thickness of the carbon skateboard at each measurement point, and calculate its variance. Define this variance as the surface unevenness of the carbon skateboard, which can be specifically expressed by the following formula:
[0053]
[0054] where: f is the surface unevenness of the carbon skateboard, h i is the surface thickness of the carbon skateboard at the i-th measurement point, n is the number of measurement points, represents the average value of the surface thicknesses of the carbon skateboards at all measurement points.
[0055] In other embodiments, the step of using the particle swarm optimization algorithm to optimize and calculate the objective function to obtain the coordinate points of the pull-out value that minimizes the surface unevenness of the carbon skateboard includes:
[0056] Use the particle swarm optimization algorithm to optimize and calculate the objective function until the surface unevenness of the carbon skateboard is less than a preset value;
[0057] Output the coordinate points of the pull-out value that minimizes the surface unevenness of the carbon skateboard.
[0058] In this embodiment, a preset value can be set, and the particle swarm optimization algorithm is used to optimize and calculate the objective function until the surface non-uniformity of the carbon skateboard is less than the preset value. That is to say, when the surface non-uniformity of the carbon skateboard meets the preset requirements at this time, the coordinate points corresponding to the pull-out values that minimize the surface non-uniformity of the carbon skateboard can be calculated through the particle swarm optimization algorithm at this time, that is, the pull-out value coordinate points.
[0059] Optionally, the formulas for the velocity and position of the particles in the particle swarm optimization algorithm are as follows:
[0060]
[0061]
[0062] Among them, is the particle flight velocity, is the position of the particle, is the current best position of the particle, is the historical best position of the particle, t is the number of iterations, r 1 、r 2 are random numbers between [0, 1], used to increase the search randomness, c 1 、c 2 are learning factors, and ω is the inertia weight.
[0063] In this embodiment, the particle swarm optimization algorithm simulates the flight behavior of particles in the search space and uses the historical experience of individuals and group information for search and optimization. In this algorithm, the particle position and velocity are continuously updated and iterated to retrieve the optimal value.
[0064] As Figure 3 shown, they are the specific parameter values set in the particle swarm optimization algorithm. Taking the surface non-uniformity of the carbon skateboard as the objective function and the set parameter conditions in Figure 3 , the coordinate points of the pull-out value of the contact wire can be obtained by using the particle swarm optimization algorithm. The specific calculation process is as Figure 4 shown. First, set the constraint conditions, including setting the length of the rigid catenary anchor section, setting the range of the pull-out value, setting the wavelength range of the layout mode, setting the operating conditions of the carbon skateboard, the particle velocity, the position boundary constraint, and setting the algorithm parameters; then, calculate the particle position and velocity; then, update the individual optimal and global optimal; then, judge whether the surface non-uniformity of the carbon skateboard is less than the preset value. If it is not less than, return to the step of calculating the particle position and velocity. If it is less than, output the coordinate points of the pull-out value that minimizes the surface non-uniformity of the carbon skateboard. As Figure 5 shown, they are the coordinate points of the pull-out value finally calculated by using the particle swarm optimization algorithm.
[0065] In some embodiments, the step of determining the layout trajectory of the contact wire according to the pull-out value coordinate points includes:
[0066] Determine a plurality of target positioning points within a quarter wavelength range of the layout trajectory of the contact wire according to the pull-out value coordinate points, where the target positioning points are positioning points for fixing the busbar of the contact wire;
[0067] Determine the layout form of the busbar according to the plurality of target positioning points.
[0068] Specifically, when determining the layout trajectory of the contact wire according to the pull-out value coordinate points, since the catenary is a rigid catenary and the fixing method of the contact wire is to use a busbar for fixing, the positioning points of the busbar are determined, and then the layout trajectory of the contact wire can be determined. Exemplarily, the pull-out values of the key busbar positioning points within a quarter waveform period (i.e., within a quarter wavelength range) of the layout trajectory of the contact wire can be given, that is, a plurality of target positioning points. Or rather, key points can be selected from several pull-out value coordinate points to position the busbar, ensuring that the layout of the contact wire can closely fit these important points, which are the target positioning points. Then, according to these target positioning points, the layout form of the busbar is specifically determined.
[0069] Further, in some embodiments, the step of determining the layout form of the busbar according to the plurality of target positioning points includes:
[0070] If the target positioning points within the length range of the busbar can be connected in sequence to form a line segment, arrange a straight busbar along the target positioning points that can be connected in sequence to form a line segment;
[0071] If the target positioning points within the length range of the busbar cannot be connected in sequence to form a line segment, bend the busbar according to the target positioning points and arrange the bent busbar along the target positioning points.
[0072] Exemplarily, taking the origin (0, 0) as the starting point and the anchor section length as 243 m, after giving the pull-out values of the key busbar positioning points within a quarter waveform period (i.e., within a quarter wavelength range) of the layout trajectory of the contact wire, assuming the length of the busbar used is 12 m, if the pull-out value coordinates can be connected in a line segment within 12 m, a straight busbar can be arranged. That is to say, if adjacent target positioning points can be connected in a line segment within 12 m, directly arrange a straight busbar along these covered target positioning points. If the pull-out value coordinates cannot be connected in a line segment within 12 m, a straight busbar cannot be directly used, and the busbar needs to be bent accordingly, and then arrange the bent busbar along these covered target positioning points. That is to say, for the curved part, the busbar needs to be bent to a certain extent according to the given pull-out value coordinates, and then arrange the bent busbar to the corresponding positions.
[0073] In some embodiments, the target positioning point includes the coordinate point of the maximum pulling-out value. The step of determining the layout trajectory of the contact wire according to the coordinate point of the pulling-out value includes:
[0074] Arranging the busbars located on both sides of the coordinate point of the maximum pulling-out value in a broken-line form.
[0075] In this embodiment, the busbars on both sides of the maximum pulling-out value should be arranged in a broken-line form to maintain the overall optimization effect. The final layout schematic diagram is as Figure 6 shown. Thus, compared with the existing layout method, the layout method in this embodiment can reduce the residence time of the contact wire in the maximum pulling-out value area on the carbon skateboard, avoid the formation of groove-shaped wear on the carbon skateboard. At the same time, the adjustment of the change rate of the pulling-out value at the anchor section joint can also effectively solve the problem of deeper wear at the center of the carbon skateboard.
[0076] In summary, the beneficial effects of the present invention are as follows: It greatly reduces the non-uniformity and the maximum wear amount of the surface of the carbon skateboard, which is beneficial to extending the service life of the carbon skateboard, improving the pantograph-catenary relationship, and enhancing the economy of using the carbon skateboard and the contact wire. The carbon skateboard with uniform wear can also reduce the occurrence probability of the pantograph-catenary arc, which is beneficial to the safe and stable operation of the pantograph-catenary.
[0077] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which the present invention belongs. The "first", "second" and similar terms used in the specification and claims of the present invention for patent application do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, the terms such as "a" or "one" do not denote a quantity limitation, but mean that there is at least one. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship also changes accordingly.
[0078] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art in the technical field, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.
Claims
1. A new rigid contact network arrangement method with uniform wear of carbon slide plates, characterized in that: The method comprises the following steps: Construct the surface unevenness of the carbon skateboard as the objective function; Setting constraints of the objective function, wherein the constraints include the anchor length of the rigid contact network, the pull-out value of the contact line, the wavelength range of the layout trajectory of the contact line, and the operating conditions of the carbon slide plate; The objective function is optimized and calculated using a particle swarm algorithm to obtain a pull-out value coordinate point position that minimizes the surface unevenness of the carbon slide plate; The layout track of the contact line is determined according to the pull-out value coordinate point position.
2. The method according to claim 1, characterized in that The step of constructing the carbon slide surface unevenness as an objective function comprises: The contact area on the carbon slide plate that contacts the contact line is divided into equal intervals in the length extension direction of the carbon slide plate to obtain a plurality of measurement points; Obtaining the thickness of the carbon slide plate at each of the measuring points, and calculating the variance of the thickness of each of the carbon slide plates; The variance is taken as the surface unevenness of the carbon sliding plate.
3. The method according to claim 1, characterized in that The step of optimizing and calculating the objective function by using a particle swarm algorithm to obtain the pull-out value coordinate point position that minimizes the surface unevenness of the carbon slide plate comprises: The objective function is optimized and calculated using a particle swarm algorithm until the surface unevenness of the carbon slide plate is less than a preset value; Output the pull-out value coordinate point position that minimizes the surface unevenness of the carbon slide plate.
4. The method according to claim 1, characterized in that The formulas for the speed and position of particles in the particle swarm algorithm are as follows: in, is the particle flying speed, is the position of the particle, is the current optimal position of the particle, is the best historical position of the particle, t is the number of iterations, r1 and r2 are random numbers between [0,1], which are used to increase the randomness of the search, c1 and c2 are learning factors, and ω is the inertia weight.
5. The method according to claim 1, characterized in that The step of determining the layout trajectory of the contact line according to the pull-out value coordinate point position comprises: Determine a plurality of target positioning points within a quarter wavelength range of the layout trajectory of the contact line according to the pull-out value coordinate point positions, wherein the target positioning points are positioning points for fixing the busbar of the contact line; The arrangement form of the busbar is determined according to the multiple target positioning points.
6. The method according to claim 5, characterized in that The step of determining the arrangement of the busbar according to the plurality of target positioning points comprises: If the target positioning points within the length range of the busbar can be sequentially connected to form a line segment, a straight busbar is arranged along the target positioning points that can be sequentially connected to form a line segment; If the target positioning points within the length range of the busbar cannot be sequentially connected to form a line segment, the busbar is bent according to the target positioning points, and the bent busbar is arranged along the target positioning points.
7. The method according to claim 5, characterized in that The target positioning point includes a maximum pull-out value coordinate point, and the step of determining the layout trajectory of the contact line according to the pull-out value coordinate point includes: The busbars located on both sides of the maximum pull-out value coordinate point are arranged in a broken line form.