Modeling method and device for railway contact net anchor section joint

Abstract

The invention discloses a modeling method and device for an anchor section joint of a railway catenary, and the method comprises the steps: carrying out the fitting according to the longitudinal coordinates and vertical coordinates of the feature points of the anchor section joint of the railway catenary, and obtaining a parabolic curve of the anchor section joint; the feature points are anchor column position points, contact line equal-height points and conversion column position points; according to the dropper arrangement information of the position of the anchor section joint of the railway overhead line system, calculating the transverse coordinate of the connection point of the anchor section joint and the dropper; according to the balance position of the contact line, dropper force of a plurality of droppers in the anchor section joint is calculated; establishing a contact line model of the anchor section joint according to the parabolic curve and the transverse coordinates; and establishing a carrier cable model of the anchor section joint according to the parabolic curve, the transverse coordinates, the dropper force and the deformation data of the carrier cable. The method is used for improving the modeling accuracy of the anchor section joint of the railway contact net and improving the simulation analysis accuracy of the anchor section joint.

Description

Technical Field

[0001] The invention relates to the technical field of railway contact network, and in particular to a modeling method and a device for railway contact network anchor section joints. Background Art

[0002] This section is intended to provide a background or context for the presented embodiments of the invention. No description herein is admitted to be prior art by virtue of its inclusion in this section.

[0003] The overhead contact network system is one of the most important components of electrified railways, providing power for electric locomotives. In order to reduce the scope of accidents, maintain constant cable tension, and reduce the scope of maintenance, the overhead contact network is divided into multiple anchor sections. The anchor section joint is the connecting part of adjacent anchor sections, ensuring a smooth transition of the pantograph. Due to its special structure, the anchor section joint will be greatly affected by temperature changes and can easily become a weak link in the system. In the prior art, the modeling of the anchor section joint mainly focuses on the geometric position of the end of the locator, while ignoring the spatial position of other key points, resulting in inaccurate modeling, which affects the simulation results and the study of the current collection law of the pantograph.

[0004] The current contact network modeling technology mainly focuses on the research of the main line contact network, and lacks the research on the dynamic response law of special sections such as anchor section joints. The existing modeling method mainly considers the geometric position of the end of the contact line locator, but ignores the spatial position of other key points of the contact line, which makes it difficult to determine the geometric position of each key point of the anchor section joint, and ultimately it is difficult to obtain an accurate contact network anchor section joint model.

[0005] The problems of the existing technical solutions are:

[0006] 1. Inaccurate modeling of anchor segment joints: The existing technology only considers the geometric position of the end of the contact line locator and ignores the spatial positions of other key points, resulting in inaccurate modeling of anchor segment joints.

[0007] 2. Limited simulation results: Due to the inaccurate modeling of the anchor segment joint, the results of the simulation analysis are affected, which in turn affects the research on the current collection law of the bow-net. Summary of the invention

[0008] The embodiment of the present invention provides a modeling method for a railway contact network anchor section joint, which is used to improve the accuracy of the modeling of the railway contact network anchor section joint and improve the accuracy of the simulation analysis of the anchor section joint. The method includes:

[0009] According to the longitudinal coordinates and vertical coordinates of the characteristic points of the railway contact network anchor section joint, a parabolic curve of the anchor section joint is fitted; the characteristic points are the anchor column position point, the contact line iso-height point and the conversion column position point;

[0010] According to the arrangement information of the suspension string at the location of the railway contact network anchor section joint, the transverse coordinates of the connection point between the anchor section joint and the suspension string are calculated;

[0011] According to the equilibrium position of the contact line, the string forces of multiple string drops in the joint of the anchor section are calculated;

[0012] Establishing a contact line model of the anchor segment joint according to the parabolic curve and the transverse coordinate;

[0013] A catenary cable model of the anchor section joint is established according to the parabolic curve, the transverse coordinate, the suspension string force and the deformation data of the catenary cable.

[0014] The embodiment of the present invention further provides a modeling device for a railway contact network anchor section joint, which is used to improve the accuracy of the modeling of the railway contact network anchor section joint and improve the accuracy of the simulation analysis of the anchor section joint. The device includes:

[0015] A curve fitting module is used to fit the parabolic curve of the anchor section joint according to the longitudinal coordinates and vertical coordinates of the characteristic points of the railway contact network anchor section joint; the characteristic points are the anchor column position points, the contact line iso-height points and the conversion column position points;

[0016] A connection point calculation module is used to calculate the lateral coordinates of the connection point between the anchor section joint and the suspension string according to the suspension string arrangement information at the location of the railway contact network anchor section joint;

[0017] A suspension string force calculation module is used to calculate the suspension string forces of multiple suspension strings in the joint of the anchor section according to the equilibrium position of the contact line;

[0018] A contact line model building module, used to establish a contact line model of the anchor segment joint according to the parabolic curve and the transverse coordinate;

[0019] The model building module of the catenary cable is used to establish the catenary cable model of the anchor section joint according to the parabolic curve, the transverse coordinate, the suspension string force and the deformation data of the catenary cable.

[0020] An embodiment of the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned modeling method of the railway contact network anchor section joint when executing the computer program.

[0021] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the modeling method of the above-mentioned railway contact network anchor section joint is implemented.

[0022] An embodiment of the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the modeling method of the above-mentioned railway contact network anchor section joint is implemented.

[0023] In the embodiment of the present invention, a parabolic curve of the anchor section joint is fitted according to the longitudinal coordinates and vertical coordinates of the characteristic points of the railway contact network anchor section joint; the characteristic points are the anchor column position point, the contact line contour point and the conversion column position point; according to the suspension string arrangement information of the position where the railway contact network anchor section joint is located, the transverse coordinates of the connection point between the anchor section joint and the suspension string are calculated; according to the equilibrium position of the contact line, the suspension string force of multiple suspension strings in the anchor section joint is calculated; according to the parabolic curve and the transverse coordinates, a contact line model of the anchor section joint is established; according to the parabolic curve, the transverse coordinates, the suspension string force and the deformation data of the load-bearing cable, a load-bearing cable model of the anchor section joint is established, so as to obtain the contact line model of the anchor section joint according to the longitudinal coordinates of the characteristic points of the railway contact network anchor section joint. The parabolic curve is fitted to the vertical coordinates and the vertical coordinates, which can accurately determine the longitudinal and vertical positions of each key point in the anchor section joint, solving the problem that the geometric positions of key points in the prior art are difficult to determine; the transverse coordinates of the connection points between the anchor section joint and the suspension string are calculated according to the suspension string arrangement information, which further improves the spatial position information of the key points and makes the anchor section joint model more accurate; by calculating the suspension string force and establishing the contact line model and the load-bearing cable model in combination with the parabolic curve, the transverse coordinates and the deformation data of the load-bearing cable, the influence of various factors on the anchor section joint model can be fully considered, thereby obtaining a more accurate contact network anchor section joint model, solving the problem of inaccurate models in the prior art, thereby improving the accuracy of simulation analysis and better reflecting the law of bow-net current collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0025] Figure 1 It is a schematic structural diagram of a railway contact network anchor section joint in an embodiment of the present invention;

[0026] Figure 2 A specific example diagram of a modeling method for a railway contact network anchor section joint in an embodiment of the present invention;

[0027] Figure 3 A specific example diagram of a joint section of a contact network system in an embodiment of the present invention;

[0028] Figure 4A specific example diagram of a parabolic curve fitting an anchor segment joint in an embodiment of the present invention;

[0029] Figure 5 It is a specific schematic diagram of the transverse coordinates of the connection point between the dropper string and the contact line / load-bearing cable in an embodiment of the present invention;

[0030] Figure 6 This is a specific example diagram of a four-span anchor segment joint model in an embodiment of the present invention;

[0031] Figure 7 A specific example diagram of a five-span anchor segment joint model in an embodiment of the present invention;

[0032] Figure 8 This is a flowchart of a modeling method for a railway contact network anchor section joint in an embodiment of the present invention;

[0033] Fig. 9 This is a structural example diagram of a modeling device for a railway contact network anchor section joint in an embodiment of the present invention;

[0034] Fig.10 Schematic diagram of a computer device used for modeling railway contact network anchor section joints in an embodiment of the present invention. DETAILED DESCRIPTION

[0035] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0036] The term "and / or" herein only describes an association relationship, indicating that three relationships may exist. For example, A and / or B may represent the following three situations: A exists alone, A and B exist at the same time, and B exists alone. In addition, the term "at least one" herein represents any combination of at least two of any one or more of a plurality of. For example, including at least one of A, B, and C may represent including any one or more elements selected from the set consisting of A, B, and C.

[0037] In the description of this specification, the terms "include", "including", "have", "contain", etc. are all open terms, which mean including but not limited to. The descriptions with reference to the terms "one embodiment", "a specific embodiment", "some embodiments", "for example", etc. mean that the specific features, structures or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. The order of steps involved in each embodiment is used to schematically illustrate the implementation of the present application, and the order of steps is not limited and can be appropriately adjusted as needed.

[0038] The acquisition, storage, use, and processing of data in the technical solution of this application are in compliance with the relevant provisions of national laws and regulations. The information collected in this application is information and data authorized by the user or fully authorized by all parties, and the collection, storage, use, processing, transmission, provision, disclosure, and application of relevant data are in compliance with the relevant laws, regulations, and standards of relevant countries and regions, and necessary confidentiality measures are taken, which do not violate public order and good customs, and provide corresponding operation entrances for users to choose to authorize or refuse. In addition, this application provides users with corresponding operation entrances for users to choose to agree or refuse the results of automated decision-making. If the user chooses to refuse, they can enter the expert decision-making process.

[0039] It should be noted that in the embodiments of the present application, some existing solutions in the industry such as certain software, components, models, etc. may be mentioned. For example, some existing software tools, components, algorithm models or other well-known solutions in other technical fields may be cited. They should be considered as exemplary, and their purpose is only to illustrate the feasibility of the implementation of the technical solution of the present application. These references should be understood as typical examples, and their core purpose is to explain and verify the rationality and feasibility of the implementation of the technical solution proposed in the present application. However, it does not mean that the applicant has or will inevitably use the solution. Such references do not imply that the applicant has actually adopted these existing solutions, or will inevitably adopt these methods in the future during its technical implementation. In other words, these references only serve to illustrate the nature of the description, to help understand the connection and transcendence between the innovation of the present application and the prior art, and do not constitute an endorsement or reliance statement on a specific prior art product.

[0040] The overhead contact system is one of the most important components of electrified railways and is the only channel for providing energy to electric locomotives. The pantograph and the overhead contact system provide energy to the train through the pantograph-net contact pair to ensure its operation. The overhead contact network is erected along the rails. In order to reduce the scope of accidents during operation, keep the tension of the wire constant, and reduce the scope of maintenance when a failure occurs, the overhead contact network is divided into several sections with a length of 1500 to 2000 meters. Such sections are called anchor sections, and the connecting part of two adjacent anchor sections is called the anchor section joint. Figure 1 The structural diagram of a railway overhead contact network anchor section joint is shown in FIG. The anchor section joint accounts for a relatively high proportion in the overhead contact network system. It is an important structure to ensure that the pantograph smoothly and safely transitions from one anchor section to another. It is also one of the weak links in the overhead contact network system.

[0041] Due to the particularity of the joint structure of the anchor section, temperature changes will cause the expansion and contraction of the line, resulting in the displacement of the iso-high points at the center column, resulting in seasonal hard points; due to the structural differences between the joint and non-joint sections of the anchor section, when the pantograph passes through different sections of the contact network, there are differences in the contact line lifting amount and contact force between the joint section and the non-joint section of the contact network system. Through the analysis of dynamic detection data in scenarios such as joint debugging and comprehensive tests, it was found that there were differences in the current collection quality of the pantograph when the pantograph passed through different sections of the contact network. For example, the lifting amount and contact force of the joint section of the contact network system are greater than those of the non-joint section (such as Figure 3 This phenomenon becomes more obvious as the train running speed increases, so the anchor section joint is the weak link in the contact network system.

[0042] Numerical simulation of the pantograph-catenary relationship is a key technology for studying the interaction between the pantograph and the catenary, and has been widely used in the research of the pantograph-catenary relationship, catenary design, pantograph optimization, and operation and maintenance. The existing pantograph-catenary simulation technology mainly focuses on the research of the mainline catenary without anchor joints, and lacks research on the dynamic response laws of special sections such as anchor joints.

[0043] Therefore, how to establish a contact network model that takes into account the anchor joint is a key issue in studying the dynamic characteristics of the contact network anchor joint. The existing modeling of the anchor joint mainly considers the geometric position of the end of the contact line locator, while ignoring the spatial position of other key points of the contact line, which makes it difficult to determine the geometric position of each key point of the anchor joint, and ultimately it is difficult to obtain an accurate contact network anchor joint model, which affects the results of simulation analysis and the law of bow-catwalk current collection.

[0044] In order to solve the above problems, an embodiment of the present invention provides a modeling method for railway contact network anchor section joints, which is used to improve the accuracy of the above railway contact network anchor section joint modeling and improve the accuracy of the anchor section joint simulation analysis. Figure 8 , the method may include:

[0045] Step 801: fitting a parabolic curve of the anchor section joint according to the longitudinal coordinates and vertical coordinates of the characteristic points of the railway contact network anchor section joint; the characteristic points are the anchor column position points, the contact line iso-height points and the conversion column position points;

[0046] Step 802: Calculate the transverse coordinates of the connection point between the anchor section joint and the suspension string according to the suspension string arrangement information at the location of the railway contact network anchor section joint;

[0047] Step 803: Calculate the suspension force of multiple suspension strings in the joint of the anchor section according to the equilibrium position of the contact line;

[0048] Step 804: establishing a contact line model of the anchor segment joint according to the parabolic curve and the transverse coordinate;

[0049] Step 805: Establishing a catenary model of the anchor segment joint according to the parabolic curve, the transverse coordinate, the suspension string force and the deformation data of the catenary.

[0050] In the embodiment of the present invention, a parabolic curve of the anchor section joint is fitted according to the longitudinal coordinates and vertical coordinates of the characteristic points of the railway contact network anchor section joint; the characteristic points are the anchor column position point, the contact line contour point and the conversion column position point; according to the suspension string arrangement information of the position where the railway contact network anchor section joint is located, the transverse coordinates of the connection point between the anchor section joint and the suspension string are calculated; according to the equilibrium position of the contact line, the suspension string force of multiple suspension strings in the anchor section joint is calculated; according to the parabolic curve and the transverse coordinates, a contact line model of the anchor section joint is established; according to the parabolic curve, the transverse coordinates, the suspension string force and the deformation data of the load-bearing cable, a load-bearing cable model of the anchor section joint is established, so as to obtain the contact line model of the anchor section joint according to the longitudinal coordinates of the characteristic points of the railway contact network anchor section joint. The parabolic curve is fitted to the vertical coordinates and the vertical coordinates, which can accurately determine the longitudinal and vertical positions of each key point in the anchor section joint, solving the problem that the geometric positions of key points in the prior art are difficult to determine; the transverse coordinates of the connection points between the anchor section joint and the suspension string are calculated according to the suspension string arrangement information, which further improves the spatial position information of the key points and makes the anchor section joint model more accurate; by calculating the suspension string force and establishing the contact line model and the load-bearing cable model in combination with the parabolic curve, the transverse coordinates and the deformation data of the load-bearing cable, the influence of various factors on the anchor section joint model can be fully considered, thereby obtaining a more accurate contact network anchor section joint model, solving the problem of inaccurate models in the prior art, thereby improving the accuracy of simulation analysis and better reflecting the law of bow-net current collection.

[0051] In the specific implementation, step 101 is first performed: a parabolic curve of the anchor section joint is fitted according to the longitudinal coordinates and vertical coordinates of the characteristic points of the railway contact network anchor section joint; the characteristic points are the anchor column position points, the contact line iso-height points and the conversion column position points.

[0052] In the embodiment, in the modeling process of the railway contact network anchor section joint, accurately determining its geometric shape is crucial for subsequent analysis and application. Among them, fitting the parabolic curve of the anchor section joint according to the longitudinal coordinates and vertical coordinates of the characteristic points of the railway contact network anchor section joint is a key step.

[0053] The characteristic points referred to here include anchor post position points, contact line contour points and conversion post position points. The anchor post position point is an important support point of the anchor section joint on the railway line. Its longitudinal and vertical coordinates determine a reference position of the anchor section joint in space. The contact line contour point refers to the position where the contact line height is equal at the anchor section joint. This position plays a key role in ensuring the stability of the pantograph during the transition process. Its longitudinal and vertical coordinates reflect the spatial state of the contact line at this specific position. The conversion post position point is another key position in the anchor section joint structure. It plays an important role in connecting different parts and determining the overall shape of the anchor section joint. Its longitudinal and vertical coordinates are also indispensable elements for constructing parabolic curves.

[0054] By obtaining the longitudinal and vertical coordinates of these feature points, the parabolic curve of the anchor joint can be fitted using mathematical methods. This parabolic curve can accurately describe the shape changes of the anchor joint in the longitudinal and vertical directions, and provides an important basis for the subsequent establishment of contact line models and load-bearing cable models. For example, in the actual railway contact network system, the shape of the anchor joint will be affected by many factors, such as temperature changes, vibrations during train operation, etc. The parabolic curve obtained by fitting can take into account the influence of these factors to a certain extent, making the model closer to the actual situation. At the same time, the parabolic curve also provides the necessary geometric basis for calculating the lateral coordinates of the connection point between the anchor joint and the suspension string, and determining the suspension string force, which helps to improve the accuracy and reliability of the entire anchor joint modeling.

[0055] In one embodiment, the suspension string arrangement information includes the initial position coordinates of the anchor segment within a span of the joint, the end position coordinates of the anchor segment within a span of the joint, and the position coordinates of different suspension strings within a span of the joint.

[0056] In one embodiment, the suspension string arrangement information covers the coordinate information of multiple key positions in the joint of the anchor section. These include the initial position coordinates of a span in the joint of the anchor section. This coordinate clarifies the spatial position of the starting point of a span and is one of the important reference points for determining the arrangement of the suspension strings; the end position coordinates of a span in the joint, which defines the spatial position of the end position of a span and defines the range of a span together with the initial position coordinates; and the position coordinates of different suspension strings in a span of the joint. These coordinates accurately describe the specific position of each suspension string in a span, which plays a key role in accurately calculating the connection relationship between the suspension string and the joint of the anchor section and the subsequent mechanical analysis. These coordinate information are interrelated and together constitute an important part of the suspension string arrangement information, providing necessary data support for accurately establishing the joint model of the railway contact network anchor section.

[0057] In the specific implementation, after performing step 101: fitting the parabolic curve of the anchor section joint according to the longitudinal coordinates and vertical coordinates of the characteristic points of the railway contact network anchor section joint, perform step 102: calculate the lateral coordinates of the connection point between the anchor section joint and the suspension string according to the suspension string arrangement information at the location of the railway contact network anchor section joint.

[0058] In one embodiment, in the process of modeling the railway contact network anchor section joint, it is an important step to calculate the lateral coordinates of the connection point between the anchor section joint and the suspension string according to the suspension string arrangement information at the location of the railway contact network anchor section joint.

[0059] The arrangement information of the suspension strings at the joint of the railway contact network contains many key elements, including the initial position coordinates of a span in the joint of the anchor section, the end position coordinates of a span in the joint, and the position coordinates of different suspension strings in a span of the joint. These coordinate information are crucial for accurately determining the position of the suspension strings in space and their relative position relationship with the joint of the anchor section.

[0060] Based on the above-mentioned suspension string arrangement information, the transverse coordinates of the connection points between the anchor segment joint and the suspension string are determined by a specific calculation method. First, it is necessary to clarify the distance relationship between different suspension strings and their distribution within a span. Through comprehensive analysis and calculation of these distance and position information, the transverse coordinates of the connection points between the anchor segment joint and each suspension string are obtained. Accurately calculating the transverse coordinates of the connection points between the anchor segment joint and the suspension string can further improve the spatial position information of the anchor segment joint model, provide an important basis for the subsequent establishment of a more accurate contact line model and load-bearing cable model, and help improve the accuracy and reliability of the anchor segment joint modeling of the entire railway contact network.

[0061] In specific implementation, after performing step 102: calculating the transverse coordinates of the connection points between the anchor section joint and the suspension strings according to the suspension string arrangement information at the location of the railway contact network anchor section joint, perform step 103: calculating the suspension string forces of multiple suspension strings in the anchor section joint according to the equilibrium position of the contact line.

[0062] In the embodiment, in the modeling of the railway contact network anchor section joint, it is a key step to calculate the string force of multiple string drops in the anchor section joint according to the equilibrium position of the contact line. The contact line is in a specific equilibrium position in the railway contact network system, and this equilibrium position is determined by the combined action of multiple factors. In order to accurately calculate the string force of multiple string drops in the anchor section joint, it is necessary to perform detailed analysis and calculation for this equilibrium position.

[0063] First, for each suspension string, different suspension string forces are applied at the connection point between the contact line and the suspension string. Since the contact line is in a balanced position, when different suspension string forces are applied, the state of the contact line will change accordingly. Then, the magnitude of the suspension string force is adjusted according to the equilibrium state of the contact line. In this process, it is necessary to continuously observe the state changes of the contact line, and gradually adjust the magnitude of the suspension string force by comparing the difference between the actual state and the theoretical equilibrium state. Until the predetermined contact line equilibrium condition is reached, the contact line is in an equilibrium state that meets the requirements. Finally, the suspension string force applied when the predetermined contact line equilibrium condition is reached is determined as the suspension string force of the suspension string in the anchor section joint.

[0064] Through this calculation method based on the equilibrium position of the contact line, the string force of each dropper in the anchor joint can be accurately determined. These string forces are of great significance for establishing accurate contact line models and load-bearing cable models, and can more comprehensively consider the influence of various factors on the anchor joint model, thereby improving the accuracy and reliability of the entire railway contact network anchor joint modeling.

[0065] In one embodiment, according to the equilibrium position of the contact line, the string forces of the plurality of string drops in the anchor section joint are calculated, including:

[0066] For each suspension string, a different suspension string force is applied at the connection point between the contact line and the suspension string;

[0067] The magnitude of the suspension string force is adjusted according to the equilibrium state of the contact line until a predetermined contact line equilibrium condition is reached; the suspension string force applied when the predetermined contact line equilibrium condition is reached is determined as the suspension string force of the suspension string in the joint of the anchor section.

[0068] In a specific embodiment, the process of calculating the string forces of multiple string drops in the anchor segment joint according to the equilibrium position of the contact line includes the following detailed steps:

[0069] First, for each dropper string, different dropper string forces are applied at the connection point between the contact line and the dropper string. This is because in the actual railway contact network system, the positions of different dropper strings and their connection relationships with the contact line are different, so it is necessary to apply different initial dropper string forces to each dropper string to observe and analyze the force response of the contact line.

[0070] Next, adjust the dropper force according to the equilibrium state of the contact line. The contact line has a specific equilibrium position in the railway contact network, and this equilibrium position is affected by a combination of factors. When different dropper forces are applied to the connection between the contact line and the dropper, the equilibrium state of the contact line will change. In order to restore the contact line to a balanced state that meets the requirements, it is necessary to closely observe the state changes of the contact line, and make detailed adjustments to the dropper force by comparing the difference between the actual state and the theoretical equilibrium state.

[0071] Finally, until the predetermined contact line balance condition is reached. This predetermined contact line balance condition is determined based on the actual operation requirements and theoretical model of the railway contact network system. When the contact line reaches this predetermined balance condition, the contact line is in a stable equilibrium state that meets the system requirements. The suspension force applied when the predetermined contact line balance condition is reached is determined as the suspension force of the suspension string in the anchor section joint. This method of determining the suspension force can accurately take into account the equilibrium position of the contact line and the actual operation requirements, providing a reliable foundation for the subsequent establishment of an accurate contact line model and a load-bearing cable model, and helping to improve the accuracy and reliability of the entire railway contact network anchor section joint modeling.

[0072] In specific implementation, after performing step 103: calculating the suspension force of multiple suspension strings in the anchor section joint according to the equilibrium position of the contact line, performing step 104: establishing a contact line model of the anchor section joint according to the parabolic curve and the transverse coordinate.

[0073] In the embodiment, the parabolic curve is obtained by fitting the longitudinal coordinates and vertical coordinates of the characteristic points of the railway contact network anchor section joint (including the anchor column position point, the contact line iso-high point and the conversion column position point). The parabolic curve can more accurately describe the shape change of the anchor section joint in the longitudinal and vertical directions, and provides an important geometric basis for the establishment of the contact line model.

[0074] The transverse coordinates are the transverse coordinates of the connection points between the anchor section joint and the suspension string calculated based on the suspension string arrangement information at the location of the anchor section joint of the railway contact network. These transverse coordinate information further improves the description of the position of the contact line in space.

[0075] Based on the above parabolic curve and transverse coordinates, the contact line model of the anchor joint is established through specific mathematical methods and mechanical principles. For example, the curve equation and coordinate information can be used to determine the spatial coordinates of the contact line at different positions, and then the geometric shape model of the contact line can be constructed. At the same time, factors such as the material properties and stress conditions of the contact line need to be considered to further refine and improve the model.

[0076] By establishing a contact line model based on parabolic curves and transverse coordinates, the geometric shape and stress conditions of the contact line at the anchor section joint can be more accurately described, providing an important basis for subsequent analysis and research, and helping to improve the accuracy and reliability of the entire railway contact network anchor section joint modeling.

[0077] For example, in a modeling project of a railway contact network anchor section joint, it is necessary to establish an accurate contact line model for subsequent analysis and research.

[0078] Step 1: Determine the parabola curve

[0079] First, determine the characteristic points of the railway contact network anchor section joint. The anchor column position point A, whose coordinates are determined by measurement or design specifications. The contact line equal height point B, with coordinates, is the position where the contact line has equal height at the anchor section joint, which is crucial to the smoothness of the pantograph transition. The conversion column position point C, with coordinates.

[0080] Through the longitudinal and vertical coordinates of these feature points, a parabolic curve is fitted using a suitable mathematical method. This parabolic curve can describe the approximate shape of the anchor segment joint in the longitudinal and vertical directions.

[0081] Step 2: Calculate the horizontal coordinates

[0082] The calculation is performed based on the suspension string arrangement information of the anchor segment joint. The initial position point F of the anchor segment joint is obtained, and the end position point R of the joint is obtained, and the coordinates are obtained. At the same time, the position points of different suspension strings in the joint are determined, and the coordinates are obtained.

[0083] Through a specific calculation method, the transverse coordinates of the connection points between the anchor joint and the suspension string are obtained. These transverse coordinate information further improves the description of the position of the contact line in space.

[0084] Step 3: Establish contact line model

[0085] The contact line model is established by combining the parabolic curve and the transverse coordinate information. Based on the parabolic curve, the approximate shape of the contact line in the longitudinal and vertical directions is determined. The transverse coordinate information accurately determines the position of the contact line in the horizontal direction. Consider the physical properties of the contact line, such as the elastic modulus and wire diameter of the material, as well as the forces it is subjected to in actual operation, including its own gravity and hanging string force. Based on these factors, the contact line model is gradually constructed using mechanical principles and mathematical models. For example, the contact line is regarded as an object with a certain elasticity. On the basis of the spatial position determined by the parabolic curve and the transverse coordinate, its deformation under force is considered. The state of the contact line at different positions is described by establishing corresponding equations, thereby completing the establishment of the contact line model.

[0086] In one embodiment, establishing a contact line model of the anchor segment joint according to the parabolic curve and the transverse coordinates includes:

[0087] Generating a contact line geometric position curve of the anchor segment joint according to the parabolic curve and the transverse coordinate;

[0088] According to the contact line geometric position curve, a contact line model of the anchor segment joint is established.

[0089] In the embodiment, the contact line geometric position curve of the anchor segment joint is generated according to the following formula:

[0090]

[0091] Among them, point A is the position point of the anchor column, with coordinates (x1, y1), point B is the position of the equal height point of the double-branch contact line in the joint, with coordinates (x2, y2), and point C is the position of the conversion column in the joint, with coordinates (x3, y3).

[0092] In specific implementation, after performing step 104: establishing the contact line model of the anchor section joint according to the parabolic curve and the transverse coordinate, perform step 105: establishing the load-bearing cable model of the anchor section joint according to the parabolic curve, the transverse coordinate, the suspension chord force and the deformation data of the load-bearing cable.

[0093] In the embodiment, the parabolic curve is obtained by fitting the longitudinal coordinates and vertical coordinates of the characteristic points of the railway contact network anchor section joint (including the anchor column position point, the contact line iso-high point and the conversion column position point). It can more accurately describe the shape change of the anchor section joint in the longitudinal and vertical directions, and provides an important geometric basis for the establishment of the load-bearing cable model.

[0094] The transverse coordinates are the transverse coordinates of the connection points between the anchor section joint and the suspension string calculated based on the suspension string arrangement information at the location of the railway contact network anchor section joint. These transverse coordinate information further improves the description of the position of the load-bearing cable in space.

[0095] The suspension string force is calculated by the equilibrium position of the contact line, which reflects the force of the suspension string on the catenary. The deformation data of the catenary includes the deformation of the catenary under the action of its own weight and the additional deformation caused by the suspension string force.

[0096] Based on the above parabolic curve, transverse coordinates, suspension string force and deformation data of the catenary, the catenary model of the anchor segment joint is established through the following steps:

[0097] First, the overall direction data of the catenary is determined based on the calculated longitudinal and vertical coordinates of the key points of the anchor joint and the key point positions of the non-joint section. This step comprehensively considers the structural characteristics of the anchor joint and non-joint section, and builds a preliminary framework for the catenary model.

[0098] Next, the horizontal position of the catenary is further refined using the transverse coordinate information obtained in the previous step. By incorporating the transverse coordinate information into the model, the position of the catenary in space is made more accurate.

[0099] Then, the finite element analysis method is used to simulate the shape change of the load-bearing cable under the action of its own weight. The finite element analysis method can accurately simulate the deformation of the load-bearing cable under the action of its own weight, providing a basis for the subsequent consideration of the influence of the suspension string force.

[0100] Afterwards, the total displacement field of the Messenger cable was solved by numerical simulation technology, combining the initial deformation of the Messenger cable under its own weight and the additional deformation caused by the suspension string force. This step comprehensively considers the various deformation factors of the Messenger cable, making the model closer to the actual situation.

[0101] Finally, the pre-set mechanical model is used to discretize the Messenger cable. The discretization process is used to describe the behavior of the Messenger cable under different load conditions. Through the discretization process, the mechanical characteristics of the Messenger cable in actual operation can be more accurately described, thereby establishing the Messenger cable model of the anchor segment joint.

[0102] By establishing a catenary cable model based on parabolic curves, transverse coordinates, hanger force and deformation data of the catenary cable, the geometric shape, stress conditions and deformation of the catenary cable at the anchor section joint can be described more accurately, which provides an important basis for subsequent analysis and research and helps to improve the accuracy and reliability of the modeling of the anchor section joint of the entire railway contact network.

[0103] In one embodiment, the overall direction data of the catenary is determined according to the parabolic curve;

[0104] Determining the position of the catenary cable in the horizontal direction by using the transverse coordinate;

[0105] The finite element analysis method is used to simulate the shape change of the load-bearing cable under the action of its own weight.

[0106] In combination with the morphological change and the additional deformation caused by the suspension string force, the total displacement field of the Messenger cable is solved by numerical simulation technology according to the overall trend data and the position of the Messenger cable;

[0107] The pre-set mechanical model is used to discretize the catenary cables; the discretization is used to describe the behavior of the catenary cables under different load conditions; and a catenary cable model of the anchor segment joint is established.

[0108] In a specific embodiment, the process of establishing the catenary cable model is as follows:

[0109] 1. Determine the overall direction data of the load-bearing cable based on the parabola curve

[0110] First, relevant operations are performed according to the parabolic curve. The parabolic curve is obtained by fitting the longitudinal coordinates and vertical coordinates of the characteristic points of the railway contact network anchor section joint (such as anchor column position points, contact line iso-high points and conversion column position points). It can more accurately describe the shape changes of the anchor section joint in the longitudinal and vertical directions. Based on the calculated longitudinal coordinates and vertical coordinates of the key points of the anchor section joint, as well as the key point positions of the non-joint section catenary cables, these factors are comprehensively considered to determine the overall direction data of the catenary cables. This step constructs a preliminary framework for the catenary cable model and clarifies the approximate path of the catenary cables in the longitudinal and vertical directions.

[0111] 2. Use the transverse coordinates to determine the horizontal position of the load-bearing cable

[0112] Next, the horizontal position of the catenary is determined using the transverse coordinates. The transverse coordinates are the transverse coordinates of the connection point between the anchor joint and the dropper string calculated based on the dropper string arrangement information at the location of the anchor joint of the railway contact network. These transverse coordinate information are crucial for accurately determining the position of the catenary in space. By incorporating the transverse coordinate information into the model, the horizontal position of the catenary can be further refined, making the position description of the catenary in space more accurate.

[0113] 3. Simulate the shape change of the load-bearing cable under its own weight

[0114] Then, the finite element analysis method is used to simulate the morphological changes of the catenary under the action of its own weight. The finite element analysis method is a numerical analysis method based on mathematical and physical principles. It can discretize the catenary into multiple units and simulate the deformation of the catenary under the action of its own weight by solving the equilibrium equations of the units. During the simulation process, factors such as the material properties, geometric shape, and boundary conditions of the catenary are considered to ensure the accuracy of the simulation results. This method can more accurately simulate the morphological changes of the catenary under the action of its own weight, providing a basis for the subsequent consideration of the influence of the suspension force.

[0115] 4. Solve the total displacement field of the load-bearing cable

[0116] Afterwards, the total displacement field of the catenary cables is solved by numerical simulation technology based on the overall trend data and the position of the catenary cables, in combination with the morphological changes of the catenary cables under the action of their own weight and the additional deformation caused by the suspension string force. In actual situations, the catenary cables are not only affected by their own weight, but also by the suspension string force. The suspension string force will cause additional deformation of the catenary cables, so it is necessary to combine the morphological changes under the action of their own weight and the additional deformation caused by the suspension string force. Through numerical simulation technology, using the determined overall trend data and the position of the catenary cables, a corresponding mathematical model is established, and the model is solved to obtain the total displacement field of the catenary cables. This step comprehensively considers the various deformation factors of the catenary cables, making the model closer to the actual situation.

[0117] 5. Discretize the load-bearing cables and establish a model

[0118] Finally, the pre-set mechanical model is used to discretize the catenary cables. The discretization process is used to describe the behavior of the catenary cables under different load conditions. In the discretization process, the catenary cables are regarded as a structure composed of multiple units, each of which has different mechanical properties. By analyzing and calculating each unit, the mechanical properties of the catenary cables in actual operation can be more accurately described. Through discretization, the catenary cable model can be further improved to more accurately reflect the behavior of the catenary cables under different load conditions. Finally, a catenary cable model of the anchor section joint is established, which can accurately describe the geometric shape, stress condition and deformation condition of the catenary cable at the anchor section joint, providing an important basis for subsequent analysis and research, and helping to improve the accuracy and reliability of the modeling of the anchor section joint of the entire railway contact network.

[0119] Several specific embodiments are given below to illustrate the specific application of the method of the present invention.

[0120] First embodiment:

[0121] The purpose of the first embodiment is to provide a contact network anchor segment joint modeling method and platform based on a quadratic parabola, so as to overcome the problem of inaccurate anchor segment joint modeling in existing contact network modeling technology, in which only the geometric position of the end of the contact line locator is considered in the anchor segment joint while the spatial positions of other key points of the contact line are ignored.

[0122] In order to achieve the above-mentioned object of the invention, the first embodiment provides the following technical solutions:

[0123] A railway contact network anchor segment joint modeling method based on a quadratic parabola comprises the following steps:

[0124] Step S1: Calculate the longitudinal coordinates and vertical coordinates of each key point in the anchor joint to obtain the quadratic parabola curve of the anchor joint;

[0125] Step S2: Calculate the transverse coordinate position of each key point in the anchor section joint. Generally, the transverse coordinate position of the connection point between the suspension string and the contact line / load-bearing cable can be obtained according to the transverse position of the suspension string arrangement;

[0126] Among them, the contact line / load-bearing cable can generally be projected on the horizontal plane, and the lateral coordinate position of the connection point between the hanger string and the contact line / load-bearing cable can be calculated by proportion according to the first and last coordinates of a span in the anchor section joint and the position of the hanger string.

[0127] In the process of modeling the joint of the railway contact network anchor section, a specific method is used to determine the lateral coordinate position of the connection point between the dropper and the contact wire / load-bearing cable. Among them, the contact wire / load-bearing cable can generally be projected on the horizontal plane. This projection operation is based on geometric principles and aims to simplify the position relationship between the contact wire and the load-bearing cable in three-dimensional space into a relationship on a two-dimensional plane for subsequent calculation and analysis.

[0128] In addition, the transverse coordinate position of the connection point between the hanger string and the contact line / load-bearing cable is calculated by proportion according to the first and last coordinates of a span in the anchor joint and the position of the hanger string. The positional relationship represented by these coordinates is analyzed and the proportional relationship is used for calculation. For example, by analyzing the proportional relationship between the distances between different hangers and the first and last positions of a span, combined with the corresponding geometric principles and calculation formulas, the transverse coordinate position of the connection point between the hanger string and the contact line / load-bearing cable is obtained. This method of projection and using the proportional relationship of coordinates can more accurately determine the transverse coordinate position of the connection point between the hanger string and the contact line / load-bearing cable, providing an important basis for the subsequent establishment of more accurate contact line models and load-bearing cable models.

[0129] Step S3: Establish a geometric model of the contact line based on the positions of the key points of the anchor section joints and the key points of the contact line of the non-joint section obtained in the first and second parts. Discretize the geometric model, use beam units or cable units to discretize the contact line and the load-bearing cable, and use spring units to discretize the suspension string;

[0130] The overlapping part of the contact network of the two anchor sections is called the anchor section joint, and the non-joint section is removed. Discretization is to find the geometric position of the contact line and the load-bearing cable of the contact network. In order to establish the finite element model of the contact network, the corresponding entity must be established according to the geometric position and the entity is meshed. This process is called discretization.

[0131] In the structure of railway contact network, there is an overlap between the contact networks of two adjacent anchor sections, which is called the anchor section joint. It plays an important role in the railway contact network system and is a key structure to ensure the smooth transition of the pantograph between different anchor sections.

[0132] Excluding the overlapping part of the contact network of the two anchor sections, the remaining part is called the non-articular section.

[0133] Discretization is an important operation in the process of building a railway catenary model. Its purpose is to accurately find the geometric position of the contact wire and the catenary. Specifically, by analyzing and processing the catenary system and decomposing it into basic geometric elements, this process is part of discretization.

[0134] In order to further establish the finite element model of the contact network, it is necessary not only to find the geometric positions of the contact wire and the catenary, but also to establish corresponding entities based on these geometric positions. These entities are a mathematical representation of the contact wire and the catenary in the finite element model, and they can reflect the actual shape and position relationship of the contact wire and the catenary in space.

[0135] Furthermore, after the entity is established, it is necessary to mesh the entity. Meshing is to further subdivide the entity into smaller units, which can better describe the geometric shape and mechanical properties of the contact line and the load-bearing cable. Through reasonable meshing, the calculation accuracy and efficiency of the finite element model can be improved.

[0136] This whole process, including finding the geometric position of the contact wire and the catenary, establishing the corresponding entities and meshing the entities, is collectively referred to as discretization. Discretization is crucial to establishing an accurate finite element model of the railway contact network, which can provide a reliable basis for subsequent analysis and research.

[0137] Step S4: applying a suspension force at the connection point between the contact line and the suspension string, and calculating the suspension force of each suspension string according to the equilibrium position of the contact line;

[0138] Among them, the suspension string force must first be calculated, and then applied vertically upward at the connection between the contact line and the suspension string.

[0139] In the process of modeling the anchor joint of the railway contact network, the processing of the suspension force is a key link. Among them, the suspension force must first be obtained through a specific calculation method. This calculation is based on the equilibrium position of the contact line and other related factors. By analyzing the state of the contact line under different stress conditions, combining the physical characteristics of the contact line and the structural characteristics of the anchor joint, the corresponding mechanical principles and mathematical models are used to calculate the reasonable suspension force value corresponding to each suspension string. The calculated suspension force needs to be applied in a specific direction at the connection between the contact line and the suspension string. Specifically, it is applied vertically upward at the connection between the contact line and the suspension string. This application direction is determined by the mechanical structure and working principle of the contact network system. The vertical upward application of the suspension force can make the contact line produce a deformation and stress state that meets the system design requirements when it is subjected to the suspension force, thereby ensuring the normal operation and stable operation of the contact line at the anchor joint, and providing guarantee for the efficient operation of the entire railway contact network system.

[0140] Step S5: establishing a geometric model of the catenary cable according to the positions of the key points of the anchor section joints and the positions of the key points of the catenary cable in the non-joint section obtained in the first part and the second part;

[0141] Among them, the positioning points of the contact line are constrained, the rated tension is applied at both ends of the contact line, and the vertical force is applied at the connection between the contact line and the suspension string. The force that can overcome the self-gravity of the contact line and keep the contact line in a state of no sag is the required suspension string force.

[0142] Among them, constraining the contact line's positioning points is a key step. The contact line has a specific spatial position and structural form in the railway contact network system. Constraining its positioning points can limit the contact line's degree of freedom, so that it deforms and is stressed in a predetermined manner during the subsequent stress process.

[0143] Applying rated tension at both ends of the contact wire is also one of the important operations. This rated tension is determined according to the design requirements and operating conditions of the railway contact network system. By applying rated tension at both ends of the contact wire, a basic stress state can be provided for the contact wire, so that it has reasonable initial conditions when it interacts with other forces such as the dropper force in the future. In addition, a vertical force is applied at the connection between the contact wire and the dropper. The application of this vertical force is based on the mechanical structure and working principle of the contact network system. By applying the vertical force, it works together with the rated tension at both ends of the contact wire and other forces such as its own gravity.

[0144] When these forces work together, they can overcome the contact line's own weight and keep the contact line in a state without sag. This force that can meet the above conditions, that is, the contact line overcomes its own weight and keeps in a state without sag, is the required suspension force. Determining such a suspension force is crucial to ensure the normal operation and stable operation of the contact line at the joint of the railway contact network anchor section, which can provide guarantee for the efficient operation of the entire railway contact network system.

[0145] Step S6: Calculate the deformation of the catenary cable under the action of its own weight, and then apply the suspension force calculated in the fourth part to the catenary cable, so as to obtain the final geometric position of the catenary cable.

[0146] Calculating the deformation of the catenary cable under its own weight includes: constraining each positioning point of the catenary cable, applying rated tension at both ends of the catenary cable, and calculating the deformation of the catenary cable under its own weight based on the balance of forces. Applying the calculated suspension string force to the catenary cable includes: vertically loading the calculated suspension string force downward at the connection between the catenary cable and the suspension string, thereby obtaining the final geometric position of the catenary cable.

[0147] In the process of modeling the railway contact network anchor section joint, the determination of the deformation of the load-bearing cable and its final geometric position is an important step.

[0148] The calculation of the deformation of the load-bearing cable under its own weight includes the following operations:

[0149] First, constrain the positioning points of the catenary cables. The catenary cables have a specific spatial position and structural form in the railway contact network system. Constraining their positioning points can limit the freedom of the catenary cables and make them deform in a predetermined way during the force process.

[0150] Next, a rated tension is applied to both ends of the catenary. This rated tension is determined based on the design requirements and operating conditions of the railway overhead contact system. By applying the rated tension, a basic stress state is provided for the catenary, so that it has a reasonable initial condition when it interacts with its own weight and other forces in the future. Then, the deformation of the catenary under its own weight is calculated based on the balance of forces. Considering the weight of the catenary itself and the rated tension applied at both ends, the deformation of the catenary under its own weight is determined based on the force balance relationship in the principle of mechanics through the corresponding mathematical model and calculation method.

[0151] Applying the calculated dropper force to the load-bearing cable involves the following operations:

[0152] First, the calculated suspension string force is loaded vertically downward at the connection point between the catenary and the suspension string. This is the loading direction determined based on the mechanical structure and working principle of the contact network system. Through this loading method, the catenary is subjected to the combined effects of its own gravity, the rated tension at both ends, and the suspension string force, thereby obtaining the final geometric position of the catenary. Determining the final geometric position of the catenary is of great significance for accurately establishing the joint model of the railway contact network anchor section, which can provide guarantee for the efficient operation of the entire railway contact network system.

[0153] Furthermore, in step S1, let A, B, and C be the key points in the joint of the anchor segment, where point A is the position of the anchor column in the joint, with coordinates (x1, y1), point B is the position of the equal height point of the double-branch contact line in the joint, with coordinates (x2, y2), and point C is the position of the conversion column in the joint, with coordinates (x3, y3). Figure 4 The specific example diagram of a parabolic curve fitting the anchor segment joint is shown. The following set of equations can be obtained through the positions of these three key points:

[0154]

[0155] Then we can obtain:

[0156]

[0157] In step S2, let F and R be the key points in the joint of the anchor segment, where point F is the initial position of a span in the joint, with coordinates (x0, y0), point R is the end position of a span in the joint, with coordinates (xn, yn), and point Di is the position of different suspension strings in a span of the joint, with coordinates (xi, yi). Figure 5 A specific schematic diagram of the transverse coordinates of the connection point between the hanger string and the contact line / load-bearing cable is shown; the transverse coordinates of the connection point between the hanger string and the contact line / load-bearing cable can be obtained through the positions of these two key points:

[0158]

[0159] Among them, z i is the transverse coordinate of the connection point between the anchor joint and the i-th suspension string; n is the transverse coordinate of the connection point between the anchor joint and the i-th suspension string; n is the total number of suspension strings; F and R are the key points in the anchor joint, where point F is the initial position of a span in the joint, with coordinates (x0, y0), and point R is the end position of a span in the joint, with coordinates (xn, yn); d i-1,i is the distance between the i-th suspension string and the i-1-th suspension string. For example, d 0,1 =x1-x0 represents the distance from the first suspension string to the initial position inside the joint.

[0160] The invention provides a railway contact network anchor section joint modeling method based on a quadratic parabola. Firstly, each key point in the anchor section joint is fitted into a quadratic parabola to obtain the longitudinal coordinates and vertical coordinates of the remaining points; then, the horizontal coordinate positions of each key point in the anchor section joint are obtained according to the arrangement of suspension strings; a contact line geometric model is established by using the positions of each key point in the anchor section joint and the positions of each key point of the contact line in a non-joint section obtained in the first two steps, and the geometric model is discretized; a suspension string force is applied at the connection between the contact line and the suspension string, and the suspension string force of each suspension string is calculated according to the equilibrium position of the contact line; a bearing cable geometric model is established by using the positions of each key point in the anchor section joint and the positions of each key point of the bearing cable in a non-joint section obtained in the first two steps; finally, the deformation of the bearing cable under the action of its own weight and the suspension string force is calculated to obtain the final geometric position of the bearing cable, and finally the contact network anchor section joint model is obtained. The present invention can establish a high-precision contact network anchor section joint model, which can be used to calculate the dynamic response of the bow-catcher under different working conditions, obtain the general law of bow-catcher current collection in the anchor section joint, and provide accurate spatial position for adjustment of the contact network anchor section joint at the construction site.

[0161] Second embodiment:

[0162] The overhead contact network is erected along the rails. In order to reduce the scope of accidents during operation, keep the tension of the wire constant, and reduce the scope of maintenance when a fault occurs, the overhead contact network is divided into several sections with a length of 1500 to 2000 meters. Such sections are called anchor sections, and the connecting part of two adjacent anchor sections is called anchor section joints. Figure 1 shown.

[0163] The pantograph transitions from anchor section 1 to anchor section 2, and needs to smoothly transition from anchor section joint 3. In anchor section joint 3, the contact line of anchor section 1 rises gently, and the contact line of anchor section 2 falls gently. The position where the contact line height is equal is called the iso-height point. Now the rising and falling curves in the anchor section joint are fitted to a quadratic parabola to obtain the geometric positions of the contact line and the catenary, and the deformation under the action of the deadweight of the catenary and the suspension string force is considered to obtain a railway contact network anchor section joint model with high accuracy.

[0164] The second embodiment provides a railway contact network anchor segment joint modeling method based on a quadratic parabola, such as Figure 2 The specific example diagram of the modeling method of the railway contact network anchor section joint shown in the figure includes:

[0165] 1: Calculate the longitudinal and vertical coordinates of each key point in the anchor joint to obtain the quadratic parabola curve of the anchor joint.

[0166] 2: Calculate the transverse coordinate position of each key point in the anchor section joint. Generally, the transverse coordinate position of the connection point between the suspension string and the contact line / load-bearing cable can be calculated based on the suspension string arrangement.

[0167] 3: According to the positions of the key points of the anchor joint obtained in the first and second parts and the positions of the key points of the contact line in the non-joint section, a geometric model of the contact line is established. The geometric model is discretized, and the contact line and the load-bearing cable are discretized using beam units or cable units, and the suspension string is discretized using spring units.

[0168] 4: Apply the suspension force at the connection between the contact line and the suspension string, and calculate the suspension force of each suspension string based on the equilibrium position of the contact line.

[0169] 5: Establish the geometric model of the load-bearing cable according to the positions of the key points of the anchor section joints and the key points of the load-bearing cables in the non-joint sections obtained in the first and second parts.

[0170] 6: Calculate the deformation of the catenary under its own weight, and then apply the hanger force calculated in the fourth part to the catenary to obtain the final geometric position of the catenary.

[0171] Third embodiment:

[0172] This embodiment adopts the railway overhead line anchor segment joint modeling method based on quadratic parabola provided in the first embodiment. In this embodiment, a four-span anchor segment joint model is established. The anchor segment joint modeling result is as follows: Figure 6 A specific example diagram of a four-span anchor segment joint model is shown.

[0173] There are four spans overlapped at the intersection of the two adjacent anchor sections at the head and end, forming a four-span anchor section joint. The four-span anchor section joint consists of two anchor columns, two conversion columns and a central pillar to form four spans.

[0174] In this specific embodiment, the railway overhead line anchor segment joint modeling method based on the quadratic parabola provided in the first embodiment is adopted, aiming to establish a railway overhead line anchor segment joint model that meets actual needs.

[0175] In this embodiment, the focus is on establishing a four-span anchor segment joint model. The so-called four-span anchor segment joint refers to the situation where two adjacent anchor segments overlap at the intersection of the head and the end. This special structural form is composed of two anchor columns, two conversion columns and a central pillar, which cooperate with each other to form four spans.

[0176] In the modeling process, the modeling method based on the quadratic parabola is strictly followed. First, the relevant feature point information of the anchor joint is obtained according to this method, including the longitudinal coordinates and vertical coordinates of the anchor column position point, the contact line and the conversion column position point, and then the parabola curve is fitted. At the same time, according to the suspension string arrangement information at the location of the anchor joint, the transverse coordinates of the connection point between the anchor joint and the suspension string are calculated. Then, the suspension string force of each suspension string is calculated based on the equilibrium position of the contact line.

[0177] Next, the contact line model is established based on the parabola curve and the transverse coordinates, and the load-bearing cable model is established by combining the parabola curve, the transverse coordinates, the chord force and the deformation data of the load-bearing cable. Through this series of steps, the joint model of the four-span anchor section is finally established. The modeling results are shown in the figure below. Figure 6 The model can accurately reflect the geometric shape, stress and deformation of the four-span anchor joint in the actual railway contact network system, providing an important basis for subsequent analysis and research.

[0178] Fourth embodiment:

[0179] This embodiment adopts the railway overhead line anchor segment joint modeling method based on quadratic parabola provided in the first embodiment. In this embodiment, a five-span anchor segment joint model is established. The anchor segment joint modeling result is as follows: Figure 7 shown.

[0180] There are five spans overlapped at the intersection of the two adjacent anchor sections at the head and the end, forming a five-span anchor section joint. The five-span anchor section joint is formed by two anchor columns, two conversion columns and two central pillars to form five spans.

[0181] In this embodiment, the railway overhead line anchor segment joint modeling method based on the quadratic parabola given in the first embodiment is used, with the aim of constructing a railway overhead line anchor segment joint model that meets actual engineering requirements.

[0182] This embodiment focuses on establishing a five-span anchor segment joint model. The five-span anchor segment joint is formed because the five spans overlap at the intersection of the two adjacent anchor segments. This unique structure is composed of two anchor columns, two conversion columns and two central pillars, which work together to form five spans.

[0183] When performing modeling operations, strictly follow the modeling method based on the quadratic parabola. First, collect the key feature point information of the anchor joint, that is, the longitudinal coordinates and vertical coordinates of the anchor column position point, the contact line and other high points, and the conversion column position point, and fit the parabola curve based on this. At the same time, according to the suspension string arrangement information at the location of the anchor joint, calculate the lateral coordinates of the connection point between the anchor joint and the suspension string. Then, determine the suspension string force of each suspension string according to the equilibrium position of the contact line.

[0184] Next, the contact line model is constructed with the help of the parabola curve and the transverse coordinates, and the model of the catenary cable is established by combining the parabola curve, the transverse coordinates, the chord force and the deformation data of the catenary cable. Through the above series of steps, the joint model of the five-span anchor section is successfully established, and the modeling results are as follows: Figure 7 The model can accurately present the geometric shape, stress and deformation of the five-span anchor joint in the actual railway contact network system, providing a key basis for subsequent analysis and research.

[0185] Fifth embodiment:

[0186] The fifth embodiment provides a railway contact network anchor segment joint modeling platform based on a quadratic parabola, which can be implemented in hardware or software to complete the modeling method described in the first embodiment. The system includes:

[0187] The anchor segment joint key point longitudinal coordinate and vertical coordinate calculation module is used to calculate the longitudinal coordinate and vertical coordinate position of each key point in the anchor segment joint, corresponding to the content of step S1 in the first embodiment.

[0188] The anchor segment joint key point transverse coordinate calculation module is used to calculate the transverse coordinate position of each key point in the anchor segment joint, corresponding to the content of step S2 in the first embodiment.

[0189] The contact line geometry model building module is used to integrate the key point positions of the anchor section joints and the key point positions of the contact line in the non-joint section obtained by S1 and S2 to establish the contact line geometry model, and discretize the geometry model. The contact line and the load-bearing cable are discretized using beam units or cable units, and the suspension string is discretized using spring units, which corresponds to the content of step S3 in the first embodiment.

[0190] The suspension string force calculation module is used to calculate the suspension string force of each suspension string according to the equilibrium position of the contact line, which corresponds to the content of step S4 in the first embodiment.

[0191] The module for establishing the geometric model of the catenary cable is used to integrate the key point positions of the anchor section joints and the key point positions of the catenary cables in the non-joint sections obtained in S1 and S2 to establish the geometric model of the catenary cable, which corresponds to the content of step S5 in the first embodiment.

[0192] The deformation calculation module under additional load is used to calculate the deformation of the catenary under the influence of its own weight and the suspension string force load obtained in S4, and obtain the final geometric position of the catenary, which corresponds to the content of step S6 in the first embodiment.

[0193] Sixth embodiment:

[0194] In a railway overhead contact system upgrade and reconstruction project, it is necessary to accurately model the overhead contact anchor section joints in a specific section to analyze their performance under different working conditions and provide a basis for subsequent maintenance and optimization.

[0195] Step 1: Fitting a parabolic curve

[0196] 1. Determine the feature points

[0197] Through on-site measurement and design drawings, the anchor column position point A is determined, and its coordinates meet the design requirements. The contact line isotope point B is the position where the contact line is at the same height at the anchor section joint, which is crucial to the smooth transition of the pantograph. Its coordinates are also determined according to relevant specifications. The conversion column position point C plays an important role in connecting different parts and determining the overall shape of the anchor section joint. The coordinates also meet the design standards.

[0198] 2. Fitting parabolic curve

[0199] According to the longitudinal and vertical coordinates of these feature points, a parabolic curve is fitted by using appropriate mathematical methods. This parabolic curve can describe the approximate shape of the anchor segment joint in the longitudinal and vertical directions.

[0200] Step 2: Calculate the horizontal coordinates

[0201] 1. Determine the arrangement information of the hanging string

[0202] The initial position point F of the joint span of the anchor section is measured, and its coordinates are consistent with the actual situation. The coordinates of the end position point R of the joint span are also determined by measurement. At the same time, the position points of different suspension strings in the joint span are determined, and the coordinates of these position points are consistent with the actual measurement results.

[0203] 2. Calculate the horizontal coordinates

[0204] By analyzing the proportional relationship between the distances between different suspension strings and the beginning and end of a span and combining the corresponding geometric principles, the lateral coordinates of the connection points of each suspension string are obtained.

[0205] Step 3: Calculate the string force

[0206] 1. Apply initial string force

[0207] For each suspension string, a different initial suspension string force is applied at the connection point between the contact line and the suspension string.

[0208] 2. Adjust the hanging string force

[0209] Adjust the string force according to the equilibrium state of the contact line. By monitoring the displacement and force of the contact line on site, it is found that the contact line deviates from the equilibrium position under the initial string force. Gradually adjust the string force until the contact line reaches the equilibrium state.

[0210] 3. Determine the string force

[0211] When the contact line reaches a state of equilibrium, the suspension force applied at this time is determined as the suspension force of the suspension string in the joint of the anchor section.

[0212] Step 4: Establish contact line model

[0213] 4. Determine the spatial coordinates of the contact line

[0214] Based on the parabola curve, it determines the approximate shape of the contact line in the longitudinal and vertical directions. The transverse coordinate information accurately determines the position of the contact line in the horizontal direction.

[0215] 5. Consider contact line characteristics and forces

[0216] Consider the physical properties of the contact line, such as the elastic modulus of the material, the wire diameter, etc., as well as the forces it is subjected to in actual operation, including its own gravity, the force of the hanging string, etc. Based on these factors, the contact line model is gradually constructed using mechanical principles and mathematical models.

[0217] Step 5: Build the cable model

[0218] 1. Determine the overall direction data of the load-bearing cable

[0219] The overall direction data of the load-bearing cable are determined based on the calculated longitudinal coordinates and vertical coordinates of the key points of the anchor section joints and the key point positions of the load-bearing cables in the non-joint sections.

[0220] 2. Refine the horizontal position of the load-bearing cables

[0221] The horizontal coordinate information obtained in the previous steps is used to further refine the position of the load-bearing cables in the horizontal direction.

[0222] 3. Simulate the deformation of the load-bearing cable due to its own weight

[0223] The finite element analysis method is used to simulate the shape changes of the load-bearing cables under the action of their own weight.

[0224] 4. Solve the total displacement field of the load-bearing cable

[0225] In combination with the initial deformation of the catenary cables under the action of their own weight and the additional deformation caused by the suspension string force, the total displacement field of the catenary cables is solved by numerical simulation technology according to the overall trend data and the positions of the catenary cables.

[0226] 5. Discrete processing of load-bearing cables

[0227] The pre-set mechanical model is used to discretize the catenary. The discretization is used to describe the behavior of the catenary under different load conditions. Finally, the catenary model of the anchor segment joint is established.

[0228] Of course, it is understandable that the above detailed process may have other variations, and the relevant variations should all fall within the protection scope of the present invention.

[0229] In the embodiment of the present invention, a parabolic curve of the anchor section joint is fitted according to the longitudinal coordinates and vertical coordinates of the characteristic points of the railway contact network anchor section joint; the characteristic points are the anchor column position point, the contact line contour point and the conversion column position point; according to the suspension string arrangement information of the position where the railway contact network anchor section joint is located, the transverse coordinates of the connection point between the anchor section joint and the suspension string are calculated; according to the equilibrium position of the contact line, the suspension string force of multiple suspension strings in the anchor section joint is calculated; according to the parabolic curve and the transverse coordinates, a contact line model of the anchor section joint is established; according to the parabolic curve, the transverse coordinates, the suspension string force and the deformation data of the load-bearing cable, a load-bearing cable model of the anchor section joint is established, so as to obtain the contact line model of the anchor section joint according to the longitudinal coordinates of the characteristic points of the railway contact network anchor section joint. The parabolic curve is fitted to the vertical coordinates and the vertical coordinates, which can accurately determine the longitudinal and vertical positions of each key point in the anchor section joint, solving the problem that the geometric positions of key points in the prior art are difficult to determine; the transverse coordinates of the connection points between the anchor section joint and the suspension string are calculated according to the suspension string arrangement information, which further improves the spatial position information of the key points and makes the anchor section joint model more accurate; by calculating the suspension string force and establishing the contact line model and the load-bearing cable model in combination with the parabolic curve, the transverse coordinates and the deformation data of the load-bearing cable, the influence of various factors on the anchor section joint model can be fully considered, thereby obtaining a more accurate contact network anchor section joint model, solving the problem of inaccurate models in the prior art, thereby improving the accuracy of simulation analysis and better reflecting the law of bow-net current collection.

[0230] The present invention has the following technical effects:

[0231] 1. Improve the modeling accuracy of anchor segment joints

[0232] Precisely determine the key point locations:

[0233] By fitting a parabolic curve according to the longitudinal and vertical coordinates of the characteristic points of the anchor section joint of the railway contact network (anchor column position points, contact line contour points and conversion column position points), the longitudinal and vertical positions of each key point in the anchor section joint can be accurately determined, solving the problem of difficulty in determining the geometric positions of key points in the prior art.

[0234] Complete spatial location information:

[0235] The lateral coordinates of the connection points between the anchor segment joint and the suspension string are calculated according to the suspension string arrangement information, which further improves the spatial position information of the key points and makes the anchor segment joint model more accurate.

[0236] 2. Improve the accuracy of the contact line model and the load-bearing cable model

[0237] The contact line model is established by considering multiple factors:

[0238] By calculating the suspension force and establishing a contact line model in combination with the parabolic curve and the transverse coordinates, the influence of various factors (such as the longitudinal and vertical shapes determined by the parabolic curve, the horizontal position determined by the transverse coordinates, and the influence of the suspension force) on the contact line model can be fully considered, thereby obtaining a more accurate contact line model.

[0239] Consider all factors to establish the load-bearing cable model:

[0240] The model of the catenary cable is established according to the parabola curve, transverse coordinates, chord force and deformation data of the catenary cable. Among them, the parabola curve and transverse coordinates determine the geometric position basis of the catenary cable, and the chord force and deformation data of the catenary cable (including the deformation under the action of deadweight and the additional deformation caused by the chord force) take into account its force and deformation, which can comprehensively consider the influence of various factors on the catenary cable model and obtain a more accurate catenary cable model.

[0241] 3. Improve the accuracy of simulation analysis and the reliability of research on the current collection law of the pantograph and catenary

[0242] Improve simulation analysis accuracy:

[0243] Since the present invention improves the accuracy of anchor segment joint modeling, the accuracy of anchor segment joint simulation analysis is thereby improved. The accurate model can more realistically reflect the behavior of the anchor segment joint under actual working conditions, providing a more reliable basis for subsequent analysis and research.

[0244] Better reflect the current receiving law of the pantograph:

[0245] More accurate contact wire models and catenary models can better reflect the law of current collection on the pantograph and catenary. In the railway contact network system, the current collection on the pantograph and catenary is a key indicator. An accurate model helps to study the law of current collection on the pantograph and catenary in depth, and provides an important basis for the design, optimization and maintenance of the contact network.

[0246] The present invention also provides a modeling device for railway contact network anchor section joints, as described in the following embodiments. Since the principle of the device to solve the problem is similar to the modeling method for railway contact network anchor section joints, the implementation of the device can refer to the implementation of the modeling method for railway contact network anchor section joints, and the repeated parts will not be repeated.

[0247] The embodiment of the present invention also provides a modeling device for a railway contact network anchor section joint, which is used to improve the accuracy of the modeling of the railway contact network anchor section joint and improve the accuracy of the simulation analysis of the anchor section joint. Fig. 9 As shown, the device comprises:

[0248] The curve fitting module 901 is used to fit the parabolic curve of the anchor section joint according to the longitudinal coordinates and vertical coordinates of the characteristic points of the railway contact network anchor section joint; the characteristic points are the anchor column position points, the contact line iso-height points and the conversion column position points;

[0249] The connection point calculation module 902 is used to calculate the lateral coordinates of the connection point between the anchor section joint and the suspension string according to the suspension string arrangement information of the location of the railway contact network anchor section joint;

[0250] A suspension string force calculation module 903 is used to calculate the suspension string forces of multiple suspension strings in the anchor section joint according to the equilibrium position of the contact line;

[0251] A contact line model building module 904 is used to build a contact line model of the anchor segment joint according to the parabolic curve and the transverse coordinate;

[0252] The catenary cable model building module 905 is used to establish the catenary cable model of the anchor section joint according to the parabolic curve, the transverse coordinates, the suspension string force and the deformation data of the catenary cable.

[0253] In one embodiment, the suspension string arrangement information includes the initial position coordinates of the anchor segment within a span of the joint, the end position coordinates of the anchor segment within a span of the joint, and the position coordinates of different suspension strings within a span of the joint.

[0254] In one embodiment, according to the equilibrium position of the contact line, the string forces of the plurality of string drops in the anchor section joint are calculated, including:

[0255] For each suspension string, a different suspension string force is applied at the connection point between the contact line and the suspension string;

[0256] The magnitude of the suspension string force is adjusted according to the equilibrium state of the contact line until a predetermined contact line equilibrium condition is reached; the suspension string force applied when the predetermined contact line equilibrium condition is reached is determined as the suspension string force of the suspension string in the joint of the anchor section.

[0257] In one embodiment, a model of the catenary cable of the anchor segment joint is established according to the parabolic curve, the transverse coordinate, the suspension string force and the deformation data of the catenary cable, including:

[0258] Determining the overall direction data of the load-bearing cable according to the parabolic curve;

[0259] Determining the position of the catenary cable in the horizontal direction by using the transverse coordinate;

[0260] The finite element analysis method is used to simulate the shape change of the load-bearing cable under the action of its own weight.

[0261] In combination with the morphological change and the additional deformation caused by the suspension string force, the total displacement field of the Messenger cable is solved by numerical simulation technology according to the overall trend data and the position of the Messenger cable;

[0262] The pre-set mechanical model is used to discretize the catenary cables; the discretization is used to describe the behavior of the catenary cables under different load conditions; and a catenary cable model of the anchor segment joint is established.

[0263] In one embodiment, establishing a contact line model of the anchor segment joint according to the parabolic curve and the transverse coordinates includes:

[0264] Generating a contact line geometric position curve of the anchor segment joint according to the parabolic curve and the transverse coordinate;

[0265] According to the contact line geometric position curve, a contact line model of the anchor segment joint is established.

[0266] In one embodiment, the contact line geometric position curve of the anchor segment joint is generated according to the following formula:

[0267]

[0268] Among them, point A is the position point of the anchor column, with coordinates (x1, y1), point B is the position of the equal height point of the double-branch contact line in the joint, with coordinates (x2, y2), and point C is the position of the conversion column in the joint, with coordinates (x3, y3).

[0269] In one embodiment, the transverse coordinate of the connection point between the anchor segment joint and the suspension string is calculated according to the following formula:

[0270]

[0271] Among them, z i is the transverse coordinate of the connection point between the anchor joint and the i-th suspension string; z_n is the transverse coordinate of the connection point between the anchor joint and the i-th suspension string; n is the total number of suspension strings; d i-1.i is the distance between the i-th suspension string and the i-1-th suspension string.

[0272] The embodiment of the present invention provides an embodiment of a computer device for implementing all or part of the content of the above-mentioned railway contact network anchor segment joint modeling method. The computer device specifically includes the following content:

[0273] Processor, memory, communication interface and bus; wherein the processor, memory and communication interface communicate with each other through the bus; the communication interface is used to realize information transmission between related devices; the computer device can be a desktop computer, a tablet computer and a mobile terminal, etc., but the present embodiment is not limited thereto. In the present embodiment, the computer device can be implemented with reference to the embodiment of the method for modeling the anchor section joint of the railway contact network and the embodiment of the device for modeling the anchor section joint of the railway contact network, and the contents thereof are incorporated herein, and the repeated parts are not repeated.

[0274] Fig.10 FIG. 1 is a schematic block diagram of the system structure of the computer device 1000 according to an embodiment of the present application. Fig.10 As shown, the computer device 1000 may include a central processor 1001 and a memory 1002; the memory 1002 is coupled to the central processor 1001. It is worth noting that Fig.10 is exemplary; other types of structures may also be used to supplement or replace this structure to implement telecommunication functions or other functions.

[0275] In one embodiment, the modeling function of the railway contact network anchor section joint can be integrated into the central processor 1001. The central processor 1001 can be configured to perform the following control:

[0276] According to the longitudinal coordinates and vertical coordinates of the characteristic points of the railway contact network anchor section joint, a parabolic curve of the anchor section joint is fitted; the characteristic points are the anchor column position point, the contact line iso-height point and the conversion column position point;

[0277] According to the arrangement information of the suspension string at the location of the railway contact network anchor section joint, the transverse coordinates of the connection point between the anchor section joint and the suspension string are calculated;

[0278] According to the equilibrium position of the contact line, the string forces of multiple string drops in the joint of the anchor section are calculated;

[0279] Establishing a contact line model of the anchor segment joint according to the parabolic curve and the transverse coordinate;

[0280] A catenary cable model of the anchor section joint is established according to the parabolic curve, the transverse coordinate, the suspension string force and the deformation data of the catenary cable.

[0281] In another embodiment, the modeling device of the railway contact network anchor section joint can be configured separately from the central processor 1001. For example, the modeling device of the railway contact network anchor section joint can be configured as a chip connected to the central processor 1001, and the modeling function of the railway contact network anchor section joint is realized through the control of the central processor.

[0282] like Fig.10 As shown, the computer device 1000 may also include: a communication module 1003, an input unit 1004, an audio processor 1005, a display 1006, and a power supply 1007. It is worth noting that the computer device 1000 does not necessarily have to include Fig.10 In addition, the computer device 1000 may also include Fig.10 For components not shown, reference may be made to the prior art.

[0283] like Fig.10 As shown, the central processor 1001 is sometimes also referred to as a controller or an operation control, and may include a microprocessor or other processor devices and / or logic devices. The central processor 1001 receives inputs and controls the operations of various components of the computer device 1000 .

[0284] The memory 1002 may be, for example, a cache, a flash memory, a hard drive, a removable medium, a volatile memory, a non-volatile memory or other suitable devices, or one or more thereof. The memory may store the above-mentioned information related to the device, and may also store a program for executing the related information. The CPU 1001 may execute the program stored in the memory 1002 to implement information storage or processing, etc.

[0285] The input unit 1004 provides input to the CPU 1001. The input unit 1004 is, for example, a key or a touch input device. The power supply 1007 is used to provide power to the computer device 1000. The display 1006 is used to display display objects such as images and text. The display may be, for example, an LCD display, but is not limited thereto.

[0286] The memory 1002 may be a solid-state memory, such as a read-only memory (ROM), a random access memory (RAM), a SIM card, etc. It may also be a memory that saves information even when the power is off, can be selectively erased, and is provided with more data, examples of which are sometimes referred to as EPROMs, etc. The memory 1002 may also be some other type of device. The memory 1002 includes a buffer memory 1021 (sometimes referred to as a buffer). The memory 1002 may include an application / function storage unit 1022, which is used to store application programs and function programs or processes for executing the operation of the computer device 1000 through the central processor 1001.

[0287] The memory 1002 may also include a data storage unit 1023 for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the computer device. The driver storage unit 1024 of the memory 1002 may include various drivers for the computer device for communication functions and / or for executing other functions of the computer device (such as messaging applications, address book applications, etc.).

[0288] The communication module 1003 is a transmitter / receiver 1003 that sends and receives signals via the antenna 1008. The communication module (transmitter / receiver) 1003 is coupled to the central processor 1001 to provide input signals and receive output signals, which may be the same as the case of a conventional mobile communication terminal.

[0289] Based on different communication technologies, multiple communication modules 1003 may be provided in the same computer device, such as a cellular network module, a Bluetooth module and / or a wireless local area network module, etc. The communication module (transmitter / receiver) 1003 is also coupled to a speaker 1009 and a microphone 1010 via an audio processor 1005 to provide an audio output via the speaker 1009 and receive an audio input from the microphone 1010, thereby realizing a common telecommunication function. The audio processor 1005 may include any suitable buffer, decoder, amplifier, etc. In addition, the audio processor 1005 is also coupled to the central processor 1001, so that recording can be performed on the local machine through the microphone 1010, and the sound stored on the local machine can be played through the speaker 1009.

[0290] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the modeling method of the above-mentioned railway contact network anchor section joint is implemented.

[0291] An embodiment of the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the modeling method of the above-mentioned railway contact network anchor section joint is implemented.

[0292] In the embodiment of the present invention, a parabolic curve of the anchor section joint is fitted according to the longitudinal coordinates and vertical coordinates of the characteristic points of the railway contact network anchor section joint; the characteristic points are the anchor column position point, the contact line contour point and the conversion column position point; according to the suspension string arrangement information of the position where the railway contact network anchor section joint is located, the transverse coordinates of the connection point between the anchor section joint and the suspension string are calculated; according to the equilibrium position of the contact line, the suspension string force of multiple suspension strings in the anchor section joint is calculated; according to the parabolic curve and the transverse coordinates, a contact line model of the anchor section joint is established; according to the parabolic curve, the transverse coordinates, the suspension string force and the deformation data of the load-bearing cable, a load-bearing cable model of the anchor section joint is established, so as to obtain the contact line model of the anchor section joint according to the longitudinal coordinates of the characteristic points of the railway contact network anchor section joint. The parabolic curve is fitted to the vertical coordinates and the vertical coordinates, which can accurately determine the longitudinal and vertical positions of each key point in the anchor section joint, solving the problem that the geometric positions of key points in the prior art are difficult to determine; the transverse coordinates of the connection points between the anchor section joint and the suspension string are calculated according to the suspension string arrangement information, which further improves the spatial position information of the key points and makes the anchor section joint model more accurate; by calculating the suspension string force and establishing the contact line model and the load-bearing cable model in combination with the parabolic curve, the transverse coordinates and the deformation data of the load-bearing cable, the influence of various factors on the anchor section joint model can be fully considered, thereby obtaining a more accurate contact network anchor section joint model, solving the problem of inaccurate models in the prior art, thereby improving the accuracy of simulation analysis and better reflecting the law of bow-net current collection.

[0293] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0294] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0295] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0296] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0297] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A modeling method for railway contact network anchor section joints, characterized in that: include: According to the longitudinal coordinates and vertical coordinates of the characteristic points of the railway contact network anchor section joint, the parabolic curve of the anchor section joint is fitted; The characteristic points are anchor column position points, contact line contour points and conversion column position points; According to the arrangement information of the suspension string at the location of the railway contact network anchor section joint, the transverse coordinates of the connection point between the anchor section joint and the suspension string are calculated; According to the equilibrium position of the contact line, the string forces of multiple string drops in the joint of the anchor section are calculated; Establishing a contact line model of the anchor segment joint according to the parabolic curve and the transverse coordinate; A catenary cable model of the anchor section joint is established according to the parabolic curve, the transverse coordinate, the suspension string force and the deformation data of the catenary cable.

2. The method according to claim 1, characterized in that The suspension string arrangement information includes the initial position coordinates of one span within the joint of the anchor segment, the end position coordinates of one span within the joint, and the position coordinates of different suspension strings within one span of the joint.

3. The method according to claim 1, characterized in that According to the equilibrium position of the contact line, the string forces of multiple stringers in the joint of the anchor section are calculated, including: For each suspension string, a different suspension string force is applied at the connection point between the contact line and the suspension string; The magnitude of the suspension string force is adjusted according to the equilibrium state of the contact line until a predetermined contact line equilibrium condition is reached; the suspension string force applied when the predetermined contact line equilibrium condition is reached is determined as the suspension string force of the suspension string in the joint of the anchor section.

4. The method according to claim 1, characterized in that According to the parabolic curve, the transverse coordinate, the suspension string force and the deformation data of the catenary, a catenary model of the anchor section joint is established, including: Determining the overall direction data of the load-bearing cable according to the parabolic curve; Determining the position of the catenary cable in the horizontal direction by using the transverse coordinate; The finite element analysis method is used to simulate the shape change of the load-bearing cable under the action of its own weight. In combination with the morphological change and the additional deformation caused by the suspension string force, the total displacement field of the Messenger cable is solved by numerical simulation technology according to the overall trend data and the position of the Messenger cable; The pre-set mechanical model is used to discretize the catenary cables; the discretization is used to describe the behavior of the catenary cables under different load conditions; and a catenary cable model of the anchor segment joint is established.

5. The method according to claim 1, characterized in that According to the parabolic curve and the transverse coordinate, a contact line model of the anchor segment joint is established, including: Generating a contact line geometric position curve of the anchor segment joint according to the parabolic curve and the transverse coordinate; According to the contact line geometric position curve, a contact line model of the anchor segment joint is established.

6. The method according to claim 5, characterized in that The contact line geometric position curve of the anchor segment joint is generated according to the following formula: Among them, point A is the position point of the anchor column, with coordinates (x1, y1), point B is the position of the equal height point of the double-branch contact line in the joint, with coordinates (x2, y2), and point C is the position of the conversion column in the joint, with coordinates (x3, y3).

7. The method according to claim 1, characterized in that The transverse coordinates of the connection points between the anchor joint and the suspension string are calculated according to the following formula: Among them, z i is the transverse coordinate of the connection point between the anchor joint and the i-th suspension string; z_n is the transverse coordinate of the connection point between the anchor joint and the i-th suspension string; n is the total number of suspension strings; d i-1.i is the distance between the i-th suspension string and the i-1-th suspension string.

8. A modeling device for railway contact network anchor section joints, characterized in that: include: A curve fitting module is used to fit the parabolic curve of the anchor section joint according to the longitudinal coordinates and vertical coordinates of the characteristic points of the railway contact network anchor section joint; the characteristic points are the anchor column position points, the contact line iso-height points and the conversion column position points; A connection point calculation module is used to calculate the lateral coordinates of the connection point between the anchor section joint and the suspension string according to the suspension string arrangement information at the location of the railway contact network anchor section joint; A suspension string force calculation module is used to calculate the suspension string forces of multiple suspension strings in the joint of the anchor section according to the equilibrium position of the contact line; A contact line model building module, used to establish a contact line model of the anchor segment joint according to the parabolic curve and the transverse coordinate; The model building module of the catenary cable is used to establish the catenary cable model of the anchor section joint according to the parabolic curve, the transverse coordinate, the suspension string force and the deformation data of the catenary cable.

9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

11. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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