Method and system for evaluating stability of cantilever of overhead line system

Abstract

The invention relates to a contact network cantilever stability evaluation method and system, and the method comprises the steps: constructing a finite element model of a cantilever device, and carrying out the dynamic finite element simulation calculation; extracting maximum stress simulation data and maximum displacement simulation data of the cantilever device in a specific time period; deploying a stress sensor and a displacement sensor, and collecting stress state data and displacement change data; extracting maximum stress actual measurement data and maximum displacement actual measurement data of the cantilever device in a specific time period; respectively comparing the maximum stress simulation data, the maximum displacement simulation data, the maximum stress actual measurement data and the maximum displacement actual measurement data with the maximum stress limit value and the maximum displacement limit value of the cantilever device; and judging the stability of the cantilever device according to a comparison result. Through a real-time monitoring technology, key parameters such as the maximum stress and the maximum displacement of the cantilever device under different working conditions are comprehensively and accurately extracted for stability judgment, and the accuracy and the reliability of evaluation are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of high-speed railway contact network, and in particular to a contact network arm stability assessment method and system. Background Art

[0002] As an important part of modern transportation, high-speed railways have attracted extensive attention and application due to their high speed and convenience. As a key facility of the electric traction power supply system, the stability and reliability of the high-speed railway overhead line play a vital role in ensuring the safe and smooth operation of trains. The overhead line system is not only required to provide continuous and stable power supply, but also must be able to withstand dynamic loads in various complex environments to ensure that the train can obtain the required power at any time.

[0003] As the core component of the contact network support device, the design and performance of the arm device directly determine the stability and reliability of the contact network. The arm device is responsible for supporting key components such as the contact wire and the load-bearing cable in the predetermined position and maintaining their good electrical conductivity and mechanical strength. During the operation of high-speed railways, the arm device needs to withstand the influence of multiple factors such as dynamic wind pressure, vibration load and temperature changes generated by the running of trains, all of which pose a potential threat to the stability of the arm device.

[0004] Among the existing arm device stability assessment methods, most still use traditional static analysis methods. Static analysis mainly focuses on parameters such as stress, strain and displacement of the arm device under static load, and ignores the impact of dynamic factors such as wind load and dynamic load on the arm stability. With the continuous development of high-speed railway technology and the continuous increase in operating speed, the impact of dynamic loads on the stability of the arm device is becoming more and more significant. Traditional static analysis methods can no longer meet the needs of comprehensive and accurate assessment of the stability of the arm device.

[0005] Therefore, it is necessary to propose a new method to overcome the above defects. Summary of the invention

[0006] The purpose of the present invention is to provide a contact network arm stability evaluation method and system to solve the problems of incompleteness and inaccuracy of existing static evaluation methods.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A method for evaluating the stability of a catenary arm, the method comprising:

[0009] Construct a finite element model of the cantilever device and perform dynamic finite element simulation calculations;

[0010] Extract the maximum stress simulation data and maximum displacement simulation data of the cantilever device within a specific time period;

[0011] Stress sensors and displacement sensors are deployed at key locations of the cantilever device to collect stress state data and displacement change data;

[0012] Extract the maximum stress measured data and the maximum displacement measured data of the arm device within a specific time period;

[0013] The maximum stress simulation data, the maximum displacement simulation data, the maximum stress measured data, and the maximum displacement measured data are compared with the maximum stress limit and the maximum displacement limit of the arm device respectively;

[0014] The stability of the cantilever device is determined based on the comparison results.

[0015] Furthermore, the arm structure is a triangular structure consisting of a flat arm, an oblique arm and a column.

[0016] Furthermore, wind load conditions are set in the finite element model of the arm device, the wind load conditions include wind attack angle and wind speed, and the wind pressure distribution is calculated according to the wind attack angle and wind speed.

[0017] Furthermore, dynamic load conditions are set in the finite element model of the arm device, and the dynamic load conditions include train speed, dynamic wind pressure, and vibration load.

[0018] Furthermore, boundary conditions are set in the finite element model of the arm-cantilever device, and the boundary conditions include displacement boundary conditions, release rotation displacement, force boundary conditions, and temperature boundary conditions.

[0019] Furthermore, constraints are set in the finite element model of the cantilever device, and the constraints include contact constraints and connection constraints.

[0020] Furthermore, stress sensors are deployed at the connection between the wrist and the insulator, the supporting point of the wrist, and the bending part of the wrist.

[0021] Furthermore, displacement sensors are deployed at the end of the wrist, key connection points, and locations susceptible to external influences.

[0022] Furthermore, when the maximum stress simulation data and the maximum stress measured data are both smaller than the maximum stress limit, and at the same time, the maximum displacement simulation data and the maximum displacement measured data are both smaller than the maximum displacement limit, it is judged that the arm device is stable.

[0023] On the other hand, a catenary arm stability assessment system is provided, the system comprising:

[0024] A simulation calculation module is used to construct a finite element model of the cantilever device and perform dynamic finite element simulation calculations;

[0025] A simulation data extraction module is used to extract the maximum stress simulation data and the maximum displacement simulation data of the arm device within a specific time period;

[0026] A measured data extraction module is used to extract the maximum stress measured data and the maximum displacement measured data of the arm device within a specific time period;

[0027] A comparison module is used to compare the maximum stress simulation data, the maximum displacement simulation data, the maximum stress measured data, and the maximum displacement measured data with the maximum stress limit value and the maximum displacement limit value of the arm device respectively;

[0028] The judgment output module is used to judge the stability of the arm-cantilever device according to the comparison result.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention provides a contact network arm stability assessment method and system, which comprehensively and accurately extracts key parameters such as maximum stress and maximum displacement of the arm device under different working conditions through real-time monitoring technology, and incorporates feedback from actual operating data, thereby greatly improving the accuracy and reliability of the assessment, and can timely discover problems in the stress state and displacement changes of the arm device, providing strong support for the optimization of structural design. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a schematic elevation view of the cantilever device.

[0033] Figure 2 2 is a schematic elevation view of a cantilever device in an embodiment.

[0034] Figure 3 2 is a plan view of the cantilever device in the embodiment.

[0035] Figure 4 2. It is a plane diagram of the displacement of the base of the load-bearing cable of the cantilever device in the embodiment. DETAILED DESCRIPTION

[0036] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0037] It should be noted that similar reference numerals and letters represent similar items, so once an item is defined in one embodiment, it does not need to be further defined and explained in subsequent embodiments. In addition, the term "comprising" and the like and any variation thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0038] It should also be noted that although the order of steps is mentioned in the method description, in some cases, they may be performed in an order different from that shown here, and this should not be construed as a limitation on the order of the steps.

[0039] The existing catenary arm stability assessment method is generally based on static analysis methods, without considering factors such as wind load and dynamic load, so the results are not reliable. To address this defect, the present invention combines data from dynamic simulation and sensor measurement, comprehensively considers the impact of wind load and dynamic load on stability, and obtains more accurate and reliable evaluation results.

[0040] The arm structure described in the method of the present invention is a high-speed railway contact network support device, which is a triangular structure composed of a flat arm, an inclined arm and a column, such as Figure 1 Specifically, the contact network arm stability assessment method provided by the present invention comprises the following steps:

[0041] S1: Construct a finite element model of the cantilever device and perform dynamic finite element simulation calculations.

[0042] When constructing the finite element model, dynamic conditions need to be loaded, taking into account factors such as the dynamic wind pressure generated by different wind attack angles and trains at different speeds, so as to comprehensively evaluate the stability of the arm device. At the same time, reasonable boundary conditions and constraints need to be set to ensure the accuracy of the simulation results, including:

[0043] (1) Set wind load conditions in the finite element model of the arm device, that is, set wind load conditions. The wind load conditions include wind attack angle and wind speed, and calculate wind pressure distribution based on the wind attack angle and wind speed.

[0044] Wind attack angle: The wind attack angle refers to the angle between the wind and the surface of the boom device. In order to fully evaluate the impact of wind load on the stability of the boom, multiple different wind attack angles are set for simulation analysis. Set different wind attack angles such as 0°, 45°, 90°, 135° and 180°.

[0045] Wind speed: Based on the actual wind speed data along the high-speed railway, multiple different wind speed values ​​are set for simulation. The wind speed values ​​cover the lowest and highest wind speeds that may be encountered, as well as the common wind speed range.

[0046] Wind pressure calculation: Based on the computational fluid dynamics method, the wind pressure distribution of the cantilever device under different wind attack angles and wind speeds is calculated. This will provide the necessary input data for subsequent simulation analysis.

[0047] (2) Dynamic load conditions are set in the finite element model of the arm device, and the dynamic load conditions include train speed, dynamic wind pressure, and vibration load.

[0048] Train speed: According to the actual running speed of high-speed railway trains, set multiple different speed values ​​for simulation.

[0049] Dynamic wind pressure: Based on the train speed and aerodynamic principles, the dynamic wind pressure generated when the train passes is calculated.

[0050] Vibration load: Consider the impact of vibration generated during train travel on the arm device. This is achieved by adding vibration excitation to the simulation model to simulate the vibration effect generated when a train passes.

[0051] (3) Boundary conditions are set in the finite element model of the arm-cantilever device. The boundary conditions include displacement boundary conditions, release rotation displacement, force boundary conditions, and temperature boundary conditions.

[0052] Displacement boundary conditions: Apply linear displacement constraints on the insulator ends: In the simulation model, certain nodes or areas on the insulator ends are fixed to prevent them from displacing in certain directions. The displacement of the insulator ends in the X and Y directions is set to zero, and only a small displacement in the Z direction (i.e., the direction perpendicular to the ground) is allowed to simulate the effects of thermal expansion and contraction in actual operation.

[0053] Release rotational displacement: In order to simulate the actual motion state of the cantilever device more realistically, it is necessary to release the rotational displacement of some components. At the connection between the insulator and the cantilever, a certain degree of rotational freedom is set to allow the cantilever to rotate slightly when subjected to wind load or dynamic load.

[0054] Force boundary conditions: According to the actual operating environment, corresponding force boundary conditions can be applied to the arm device in the model. The forces acting on the arm device by the contact wire and contact line of the contact network are simulated, and these forces are applied to the corresponding nodes or areas in the model in the form of concentrated force or distributed force.

[0055] Temperature boundary conditions: Considering the impact of temperature changes on the stability of the arm device, temperature boundary conditions can be set in the model. Certain components or areas in the model can be set to have specific temperature distribution or temperature change rules to simulate the temperature change effect in actual operation.

[0056] (4) Setting constraints in the finite element model of the cantilever device, including contact constraints and connection constraints.

[0057] Contact constraints: In the simulation analysis of the cantilever device, the contact and friction effects between different components need to be considered. Therefore, contact constraints can be set in the model to simulate these effects. The contact surface between the cantilever and the positioner, positioning tube and other components is set to have specific parameters such as friction coefficient and contact stiffness.

[0058] Connection constraints: The various components in the cantilever device are usually connected together by bolts, welding, etc. In the simulation model, these connection methods need to be accurately simulated. Use constraints such as hinge connection and rigid connection to simulate bolt connections; use welding constraints to simulate welding connections.

[0059] S2: Extract the maximum stress simulation data and maximum displacement simulation data of the cantilever device within a specific time period.

[0060] S3: Stress sensors and displacement sensors are deployed at key locations of the cantilever device to collect stress state data and displacement change data.

[0061] (1) Stress sensors are mainly used to monitor the stress changes of the wrist-arm device under stress, and should be installed in the parts of the wrist-arm device that are subject to greater stress, stress concentration, or possible fatigue damage. For example, stress sensors are deployed at the connection between the wrist and the insulator, the support point of the wrist, and the bending part of the wrist.

[0062] The connection between the wrist and the insulator: One of the areas with relatively concentrated stress in the wrist device. The stress changes in this area may be particularly significant, especially when the train passes at high speed or encounters severe weather conditions such as strong winds.

[0063] Support points of the arm: The arm device is usually connected to other parts of the contact network through support points (such as positioning tubes, positioners, etc.). These support points bear the weight of the contact network and the dynamic loads generated when the train passes.

[0064] Bending part of the wrist: At the bending part of the wrist, the stress may change due to the change of shape and the elastic properties of the material. Installing stress sensors at these locations can monitor the stress state of the wrist in real time and detect potential fatigue or damage problems in time.

[0065] (2) The displacement sensor is mainly used to monitor the displacement changes of the arm device, including horizontal displacement, vertical displacement and rotational displacement. It should be installed in a position that can accurately reflect the overall displacement changes of the arm device. For example, the displacement sensor is deployed at the end of the arm, key connection points, and locations susceptible to external influences.

[0066] The end of the arm: The end of the arm is the part of the contact network that is directly connected to the contact line. Its displacement change may directly affect the position and stability of the contact line.

[0067] Key connection points: In the wrist-arm device, the displacement changes of some key connection points (such as the connection points between the wrist-arm and the positioner, the connection points between the positioner and the positioning tube, etc.) may have an important impact on the stability of the entire device.

[0068] Locations susceptible to external influences: Along the high-speed railway, some locations may be more susceptible to external factors (such as wind, temperature changes, etc.), resulting in changes in the displacement of the arm device.

[0069] S4: Extract the maximum stress measured data and the maximum displacement measured data of the arm device within a specific time period.

[0070] S5: Compare the maximum stress simulation data, the maximum displacement simulation data, the maximum stress measured data, and the maximum displacement measured data with the maximum stress limit and the maximum displacement limit of the arm device, respectively.

[0071] S6: Determine the stability of the arm-to-arm device based on the comparison results. When the maximum stress simulation data and the maximum stress measured data are both less than the maximum stress limit, and the maximum displacement simulation data and the maximum displacement measured data are both less than the maximum displacement limit, the arm-to-arm device is determined to be stable.

[0072] This method evaluates the stability of the arm device based on the simulation analysis and real-time monitoring results. The evaluation results will include key parameters such as the maximum stress and maximum displacement of the arm device under different working conditions, as well as whether the structural strength requirements are met. The parameters include two categories: running simulation analysis to extract key parameters such as the maximum stress and maximum displacement of the arm device under different working conditions (such as high-speed train passing, strong wind, etc.); installing stress sensors and displacement sensors at key parts of the arm device to monitor its stress state and displacement changes in real time. Among them, the sensor data is transmitted to the data center in real time by wireless transmission for preprocessing and analysis. The key parameters such as the maximum stress and maximum displacement of the arm device in a specific time period are extracted from the real-time monitoring data. After obtaining the structural strength requirements, that is, the key indicators such as the maximum stress limit and the maximum displacement limit, the key parameters are compared with the structural strength requirements, and the key parameters extracted by simulation analysis and real-time monitoring are compared with the structural strength requirements of the arm device to determine whether the maximum stress and maximum displacement of the arm device under different working conditions exceed the threshold of the structural strength requirements. Comprehensively consider the stress state and displacement changes of the arm device under different working conditions, as well as its impact on the structural strength.

[0073] If the maximum stress and maximum displacement of the arm device under different working conditions do not exceed the threshold of the structural strength requirements, and the overall stress state and displacement changes are within a reasonable range, the arm device is judged to have good stability. If there is a situation that exceeds the structural strength requirements, or the stress state and displacement changes are abnormal, the arm device needs to be further inspected and repaired to ensure its stability.

[0074] Finally, according to the stability assessment results, targeted optimization suggestions are put forward. For areas with concentrated stress and excessive displacement, reinforcement measures or improved design solutions can be proposed.

[0075] Example:

[0076] like Figure 2-4 The triangle structure is composed of a flat arm, an oblique arm and a column. The whole structure is a simply supported beam structure, and the positioner is in a cantilever beam state. The positioner relies on the positioning tube for stability. At the same time, the positioner is responsible for the left and right lateral positioning of the contact line in the X direction, ensuring that the contact line and the pantograph are not separated, and transmitting the X-direction load of the contact line to the oblique arm. The base of the load-bearing cable clamps the load-bearing cable to ensure the position of the load-bearing cable and the contact line in the Z direction. The stress conditions of the contact network are classified as follows:

[0077] 1. Positioner: It is subject to the tensile force FX1 in the X direction caused by the zigzag layout of the contact line. The change of this force with time is small and can be regarded as a constant force. It is subject to the elastic force FZ1 in the Z direction of the pantograph. The change of this force with time is periodic and can be regarded as a cyclic force FZ1, which will generate vibration. It is subject to the force Fy1 in the Y direction caused by wind load, etc. This force is non-periodic and can be regarded as an impact force Fy1.

[0078] 2. The base of the catenary cable: It is subjected to the force Fy2 in the Y direction of the wind load. This force is non-periodic and can be regarded as the impact force Fy2. It is subjected to the tension force F2V Zhou on the anchor section side of the catenary cable. From the top view, this force point rotates around the base of the arm. The column generates a tensile force F column pull = FV2 Zhou × sinθ. This force fluctuates periodically in the morning and evening, and in spring / summer.

[0079] The combined force Fz2, which is subject to the gravity of the catenary and the contact line load in the z direction, has a small fluctuation over time and can be regarded as force Fz2. It can be seen that when there is a difference between Fy1 and FV2, stress will be generated at the connection between the positioner and the positioning rod, resulting in deformation, which in turn affects the fluctuating deformation of the contact line in the Z direction, causing the contact line to lose its positioning and the pull-out value of the positioner to change, resulting in a bow-net accident. From the Z-direction bending moment diagram, it can be seen that the vibration of the far right side of the flat arm is equivalent to the vibration of the entire arm system structure.

[0080] In order to reflect the stability of the entire cantilever system structure, two collection points are selected. The location of collection point 1 is selected near the flat cantilever bearing case installation position on the cantilever end of the cantilever beam. By measuring the displacement, inertial variables and forces in the Y and Z directions perpendicular to the paper at this position, it can be used as an effective theoretical basis for evaluating the overall stability of the contact network. The location of collection point 2 is selected near the side of the locator close to the contact line. By collecting displacement, force and inertial variables in the three directions of x, y and z, the safety of the locator is locally judged to ensure the stability of the contact network.

[0081] Then, combined with the above S1-S6, the stability of the contact network arm is judged.

[0082] This method has the following technical advantages:

[0083] 1. Improve the accuracy of evaluation: By combining simulation analysis with real-time monitoring technology, the present invention can comprehensively and accurately extract key parameters such as the maximum stress and maximum displacement of the arm device under different working conditions. This comprehensive evaluation method not only takes into account the results of theoretical calculations, but also incorporates the feedback of actual operation data, thereby greatly improving the accuracy and reliability of the evaluation.

[0084] 2. Optimize structural design: Based on the evaluation method and system provided by the present invention, problems in the force state and displacement change of the arm-to-arm device can be discovered in a timely manner, providing strong support for the optimization of the structural design. By comparing key parameters with structural strength requirements, potential risk points can be accurately located, thereby guiding designers to make targeted improvements and improve the overall performance and stability of the arm-to-arm device.

[0085] 3. Reduce maintenance costs: By real-time monitoring of the stress state and displacement changes of the arm device, the present invention can detect abnormal conditions and issue early warnings in a timely manner, thereby avoiding sudden shutdowns or accidents caused by faults. This not only reduces the economic losses caused by downtime for maintenance, but also reduces the social impact caused by accidents. At the same time, regular evaluation and maintenance can also extend the service life of the arm device and further reduce maintenance costs.

[0086] 4. Improve operational safety: As an important means of transportation, the operational safety of high-speed railways is of vital importance. The present invention provides a strong guarantee for the safe operation of high-speed railways by providing accurate arm device stability assessment results. By timely discovering and dealing with potential safety hazards, it can ensure that high-speed railways can maintain stable operation in severe weather or special working conditions, thereby protecting the lives and property of passengers.

[0087] On the other hand, the present invention also provides a contact network arm stability assessment system for implementing the above method, the system comprising:

[0088] A simulation calculation module is used to construct a finite element model of the wrist-arm device and perform dynamic finite element simulation calculation, corresponding to S1 of the above method;

[0089] A simulation data extraction module, used to extract the maximum stress simulation data and the maximum displacement simulation data of the arm device within a specific time period, corresponding to S2 of the above method;

[0090] A measured data extraction module, used to extract the maximum stress measured data and the maximum displacement measured data of the arm device within a specific time period, corresponding to S4 of the above method;

[0091] A comparison module, used to compare the maximum stress simulation data, the maximum displacement simulation data, the maximum stress measured data, and the maximum displacement measured data with the maximum stress limit value and the maximum displacement limit value of the arm device, respectively, corresponding to S5 of the above method;

[0092] The judgment output module is used to judge the stability of the wrist-arm device according to the comparison result, corresponding to S6 of the above method.

[0093] Those skilled in the art will appreciate that all or part of the functions of the embodiments of the present invention may be implemented by hardware or by computer programs. When all or part of the functions in the above-mentioned embodiments are implemented by computer programs, the program may be stored in a computer-readable storage medium, and the storage medium may include: a read-only memory, a random access memory, a disk, an optical disk, a hard disk, etc., and the program is executed by a computer to implement the above-mentioned functions. For example, the program is stored in the memory of the device, and when the program in the memory is executed by the processor, all or part of the above-mentioned functions can be implemented. In addition, when all or part of the functions in the above-mentioned embodiments are implemented by computer programs, the program may also be stored in a storage medium such as a server, another computer, a disk, an optical disk, a flash disk or a mobile hard disk, and saved in the memory of the local device by downloading or copying, or the system of the local device is updated, and when the program in the memory is executed by the processor, all or part of the functions in the above-mentioned embodiments can be implemented.

[0094] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the idea of ​​the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A method for evaluating the stability of a catenary arm, characterized in that: The method comprises: Construct a finite element model of the cantilever device and perform dynamic finite element simulation calculations; Extract the maximum stress simulation data and maximum displacement simulation data of the cantilever device within a specific time period; Stress sensors and displacement sensors are deployed at key locations of the cantilever device to collect stress state data and displacement change data; Extract the maximum stress measured data and the maximum displacement measured data of the arm device within a specific time period; The maximum stress simulation data, the maximum displacement simulation data, the maximum stress measured data, and the maximum displacement measured data are compared with the maximum stress limit and the maximum displacement limit of the arm device respectively; The stability of the cantilever device is determined based on the comparison results.

2. The method for evaluating the stability of a contact network arm according to claim 1, characterized in that: The arm structure is a triangular structure consisting of a flat arm, an oblique arm and a column.

3. The method for evaluating the stability of a contact network arm according to claim 2, characterized in that: Wind load conditions are set in the finite element model of the cantilever device. The wind load conditions include wind attack angle and wind speed. Wind pressure distribution is calculated based on the wind attack angle and wind speed.

4. The method for evaluating the stability of a contact network arm according to claim 3, characterized in that: Dynamic load conditions are set in the finite element model of the cantilever device, and the dynamic load conditions include train speed, dynamic wind pressure, and vibration load.

5. The method for evaluating the stability of a contact network arm according to claim 4, characterized in that: Boundary conditions are set in the finite element model of the cantilever device, and the boundary conditions include displacement boundary conditions, release rotation displacement, force boundary conditions, and temperature boundary conditions.

6. The method for evaluating the stability of a contact network arm according to claim 5, characterized in that: Constraints are set in the finite element model of the cantilever device, including contact constraints and connection constraints.

7. The method for evaluating the stability of a contact network arm according to claim 6, characterized in that: The stress sensors are deployed at the connection between the wrist and the insulator, the supporting point of the wrist, and the bending part of the wrist.

8. The method for evaluating the stability of a contact network arm according to claim 7, characterized in that: Displacement sensors are deployed at the end of the wrist, key connection points, and locations susceptible to external influences.

9. The method for evaluating the stability of a contact network arm according to claim 8, characterized in that: When the maximum stress simulation data and the maximum stress measured data are both smaller than the maximum stress limit, and at the same time, the maximum displacement simulation data and the maximum displacement measured data are both smaller than the maximum displacement limit, it is judged that the arm device is stable.

10. Catenary arm stability assessment system, characterized by: The system comprises: A simulation calculation module is used to construct a finite element model of the cantilever device and perform dynamic finite element simulation calculations; A simulation data extraction module is used to extract the maximum stress simulation data and the maximum displacement simulation data of the arm device within a specific time period; A measured data extraction module is used to extract the maximum stress measured data and the maximum displacement measured data of the arm device within a specific time period; A comparison module is used to compare the maximum stress simulation data, the maximum displacement simulation data, the maximum stress measured data, and the maximum displacement measured data with the maximum stress limit value and the maximum displacement limit value of the arm device respectively; The judgment output module is used to judge the stability of the arm-cantilever device according to the comparison result.

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