Method and device for evaluating impact force of broken transmission conductor on railway shed tunnel

Abstract

The invention provides a method and device for evaluating the impact force of a broken transmission conductor on a railway shed tunnel, and relates to the field of computer simulation. The method comprises the steps of obtaining impact force analysis parameters in response to impact force analysis operation on a target railway shed tunnel when a target wire is fractured; obtaining a plurality of first characteristics influencing impact force analysis and calculation through the impact force analysis parameters; calculating a sensitivity index corresponding to each first feature; according to the sensitivity index corresponding to each first feature, configuring different weight parameters for the plurality of first features; constructing a plurality of second features through a preset algorithm according to the first features and the weight parameters; and constructing an impact force analysis model according to the plurality of second features, and calculating instantaneous impact force data of the target conductor on the target railway shed tunnel when the target conductor is fractured through the impact force analysis model. According to the method, the problem that the calculation precision of instantaneous impact force data is relatively low only through a traditional modeling method when multiple environmental factors are combined is solved.

Description

Technical Field

[0001] The present application relates to the field of computer simulation, and in particular to a method and device for evaluating the impact force of a broken transmission line on a railway tunnel. Background Art

[0002] After a transmission line breaks, its motion characteristics show significant nonlinear dynamic characteristics due to the effect of air resistance, which is a major challenge in current engineering and scientific research.

[0003] To address this problem, there are two common numerical modeling methods: one is a continuous medium model based on partial differential equations, which can more accurately describe the complex deformation and stress distribution of the conductor during the fracture process; the other is a discrete particle model based on ordinary differential equations, which usually uses damping springs or ball-bar structures to simulate the motion behavior of the conductor. These two types of models have their own advantages and disadvantages, but in practical applications, the motion characteristics of the conductor are often affected by multiple environmental factors, such as air flow fields, gravity, wind loads, etc., which makes its motion present complex nonlinear behavior. Therefore, when combining multiple environmental factors, the above-mentioned traditional modeling methods alone cannot accurately calculate the instantaneous impact force data of the transmission line on the railway shed after the fracture, and there is a problem of low model calculation accuracy.

[0004] Therefore, there is an urgent need for a method and device for evaluating the impact force of a broken transmission line on a railway tunnel. Summary of the invention

[0005] The present application provides a method and device for evaluating the impact force of a broken transmission line on a railway shed tunnel, which solves the problem that when combining multiple environmental factors, the instantaneous impact force data of the transmission line on the railway shed tunnel cannot be accurately calculated using only the above-mentioned traditional modeling method, and the model calculation accuracy is low.

[0006] In a first aspect of the present application, a method for evaluating the impact force of a broken transmission line on a railway tunnel is provided, the method comprising: in response to an impact force analysis operation on a target railway tunnel when a target line is broken, obtaining impact force analysis parameters, the impact force analysis parameters including line setting parameters corresponding to the target line, tunnel structure parameters corresponding to the target railway tunnel, and relative position parameters; obtaining multiple first features that affect the impact force analysis calculation through the impact force analysis parameters; calculating a sensitivity index corresponding to each first feature, one first feature corresponding to one sensitivity index; configuring different weight parameters for multiple first features according to the sensitivity index corresponding to each first feature, one first feature corresponding to one weight parameter; constructing multiple second features according to the first features and the weight parameters and through a preset algorithm, the dimension corresponding to the second features being greater than the dimension corresponding to the first features; constructing an impact force analysis model according to the multiple second features, and calculating instantaneous impact force data of the target line on the target railway tunnel when it is broken through the impact force analysis model.

[0007] Optionally, in response to an impact force analysis operation on a target railway tunnel when a target conductor is broken, before obtaining impact force analysis parameters, the method further includes: setting a preset working path, the preset working path including a simulation working path, an ANSYS software working path, and an ANSYS / LS-DYNA software working path, wherein the simulation working path is used to save impact force analysis parameters, instantaneous impact force data, and temporary data, the ANSYS software working path is used to call ANSYS software to generate corresponding parametric design codes, and the ANSYS / LS-DYNA software working path is used to call LS-DYNA for further modeling and simulation.

[0008] Optionally, the conductor setting parameters, shed tunnel structure parameters and relative position parameters in the impact force analysis parameters are obtained, specifically including: obtaining the conductor splitting number parameter, the unit mass parameter, the density parameter, the elastic modulus parameter, the Poisson's ratio parameter, the diameter parameter, the spacer configuration parameter, the insulator string configuration parameter, the conductor surface icing parameter and the windage effect parameter, and using them as the conductor setting parameters; obtaining the foam concrete mechanical parameters, the shed tunnel column design parameters and the concrete thickness parameters, and using them as the shed tunnel structure parameters; obtaining the crossing angle parameters and the distance parameters, and using them as the relative position parameters.

[0009] Optionally, the sensitivity index corresponding to each first feature is calculated, specifically including: constructing a feature sample set of multiple first features; calculating the maximum impact force of the shelf hole based on the feature sample set and through a simulation experiment; calculating the total variance and expected conditional variance corresponding to the feature sample set based on the maximum impact force of the shelf hole; calculating the sensitivity index corresponding to each first feature based on the total variance and the expected conditional variance.

[0010] Optionally, calculating the sensitivity index corresponding to each first feature according to the total variance and the expected conditional variance specifically includes: calculating the sensitivity index corresponding to each first feature according to the following formula:

[0011]

[0012] Among them, Y is the maximum impact force of the shed hole, X is the feature sample set of the first feature, represents the value of the i-th first feature in the feature sample set, n is the number of first features, T i is the sensitivity index corresponding to the i-th first feature, M(Y) is the total variance, N -i (E i (Y|x -i )) is the conditional expected variance of the joint distribution corresponding to the i-th first feature.

[0013] Optionally, different weight parameters are configured for multiple first features according to the sensitivity index corresponding to each first feature, specifically including: sorting the sensitivity index corresponding to each first feature from large to small according to the numerical value; and configuring different weight parameters for multiple first features according to the sorting result.

[0014] Optionally, after constructing an impact force analysis model based on multiple second features and calculating the instantaneous impact force data of the target conductor on the target railway shed when it breaks through the impact force analysis model, the method also includes: taking multiple sets of conductor setting parameters and multiple sets of relative position parameters as input, and calculating multiple sets of instantaneous impact force data of the target conductor on the target railway shed when it breaks through the impact force analysis model; obtaining the first instantaneous impact force data and the second instantaneous impact force data from the multiple sets of instantaneous impact force data, the first instantaneous impact force data and the second instantaneous impact force data being any two different sets of instantaneous impact force data from the multiple sets of instantaneous impact force data; if it is confirmed that the first instantaneous impact force data is greater than the second instantaneous impact force data, then obtaining the target conductor setting parameters and target relative position parameters input for calculating the first instantaneous impact force data; and using the target conductor setting parameters and the target relative position parameters as the optimal setting parameters.

[0015] In a second aspect of the present application, a device for evaluating the impact force of a broken transmission line on a railway tunnel is provided, the device comprising an acquisition module and a processing module, wherein:

[0016] An acquisition module is used to obtain impact force analysis parameters in response to an impact force analysis operation on a target railway tunnel when a target conductor is broken, wherein the impact force analysis parameters include conductor setting parameters corresponding to the target conductor, tunnel structure parameters corresponding to the target railway tunnel, and relative position parameters; and through the impact force analysis parameters, a plurality of first features that affect the impact force analysis calculation are obtained.

[0017] A processing module is used to calculate the sensitivity index corresponding to each of the first features, one first feature corresponds to one sensitivity index; according to the sensitivity index corresponding to each of the first features, different weight parameters are configured for multiple first features, one first feature corresponds to one weight parameter; according to the first features and the weight parameters, and through a preset algorithm, multiple second features are constructed, and the dimension corresponding to the second features is greater than the dimension corresponding to the first feature; an impact force analysis model is constructed according to the multiple second features, and the instantaneous impact force data of the target wire on the target railway shed when it is broken is calculated through the impact force analysis model.

[0018] In the third aspect of the present application, an electronic device is provided, including a processor, a memory, a user interface and a network interface, the memory is used to store instructions, the user interface and the network interface are used to communicate with other devices, and the processor is used to execute the instructions stored in the memory so that the electronic device executes any one of the methods described above.

[0019] In a fourth aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and the computer program is executed by a processor to perform any of the above methods.

[0020] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0021] 1. When the target conductor is broken, the impact force analysis operation on the target railway shed is performed to obtain impact force analysis parameters; through the impact force analysis parameters, multiple first features that affect the impact force analysis calculation are obtained, and the sensitivity index corresponding to each first feature is calculated; according to the sensitivity index corresponding to each first feature, different weight parameters are configured for the multiple first features; according to the first features and the weight parameters, multiple second features are constructed through a preset algorithm; according to the multiple second features, an impact force analysis model is constructed, and the instantaneous impact force data of the target conductor on the target railway shed when it is broken is calculated through the impact force analysis model, so that a high-dimensional second feature is constructed by combining multiple environmental factors, and the impact force analysis model is constructed through the second feature, so that the impact force analysis model is more accurate in calculating the instantaneous impact force data, and the problem of low calculation accuracy of the traditional model is solved.

[0022] 2. By setting a variety of impact force analysis parameters, including conductor setting parameters, tunnel structure parameters corresponding to the target railway tunnel, relative position parameters, etc., various factors are combined to provide a basis for accurate simulation analysis and optimal design.

[0023] 3. Since there are many factors that affect conductor behavior and impact force, including complex interactions of physical, environmental and structural parameters, changes in a single parameter may have a significant impact on the analysis results. Therefore, by configuring different sensitivity parameters for different first characteristics, computing resources can be allocated to different computing parameters according to reasonable weights during the design process to improve the efficiency of railway tunnel impact force analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a flow chart of a method for evaluating the impact force of a broken transmission line on a railway tunnel provided in an embodiment of the present application;

[0025] Figure 2 This is a schematic diagram of a cross-over transmission line and a planned railway tunnel provided in an embodiment of the present application;

[0026] Figure 3 This is a schematic diagram of high-dimensional feature generation provided in an embodiment of the present application;

[0027] Figure 4 This is a schematic diagram of a cascade forest structure provided in an embodiment of the present application;

[0028] Figure 5 It is a module schematic diagram of a device for evaluating the impact force of a broken transmission line on a railway tunnel provided in an embodiment of the present application;

[0029] Figure 6 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application.

[0030] Explanation of the reference numerals: 51, acquisition module; 52, processing module; 601, processor; 602, communication bus; 603, user interface; 604, network interface; 605, memory. DETAILED DESCRIPTION

[0031] In order to enable technicians in this field to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments.

[0032] The terms used in the following embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to be used as limitations to the present application. As used in the specification of the present application, the singular expressions "one", "a kind of", "said", "above", "the" and "this" are intended to also include plural expressions, unless there is a clear indication to the contrary in the context. It should also be understood that the term "and / or" used in the present application refers to and includes any or all possible combinations of one or more listed items.

[0033] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features, and in the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0034] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] Please refer to Figure 1 , which shows a flow chart of a method for evaluating the impact force of a broken transmission line on a railway tunnel provided in an embodiment of the present application, and the flow chart mainly includes the following steps: S101 to S106.

[0036] Step S101, in response to an impact force analysis operation on a target railway tunnel when a target conductor is broken, an impact force analysis parameter is obtained, the impact force analysis parameter including conductor setting parameters corresponding to the target conductor, tunnel structure parameters corresponding to the target railway tunnel, and relative position parameters.

[0037] Specifically, the 1000kV conductor of the Hu'an Line of the Shanghe-Hangzhou Railway is used as an example to analyze the impact force of the target conductor on the railway tunnel when it breaks. First, the impact force analysis parameters are obtained, which include the conductor setting parameters corresponding to the target conductor, the tunnel structure parameters corresponding to the target railway tunnel, and the relative position parameters.

[0038] In a possible implementation, step S101 further includes: obtaining a conductor splitting number parameter, a conductor unit mass parameter, a conductor density parameter, a conductor elastic modulus parameter, a conductor Poisson's ratio parameter, a conductor diameter parameter, a spacer configuration parameter, an insulator string configuration parameter, a conductor surface icing parameter, and a windage effect parameter, and using them as conductor setting parameters; obtaining foam concrete mechanical parameters, shed hole column design parameters, and concrete thickness parameters, and using them as shed hole structure parameters; obtaining a crossing angle parameter and a distance parameter, and using them as relative position parameters.

[0039] Specifically, at this stage, it is first necessary to set the relevant physical parameters, that is, the conductor setting parameters corresponding to the target conductor. Specifically, it includes but is not limited to: the number of conductor splitting parameters, the unit mass parameters of the conductor, the density parameters of the conductor, the elastic modulus parameters of the conductor, the Poisson's ratio parameters of the conductor, the diameter parameters of the conductor, the spacer configuration parameters, the insulator string configuration parameters, the windage effect parameters, etc. If the impact of freezing weather on the conductor is taken into account, it is also necessary to input the unit weight and density of the conductor under icing conditions, that is, the icing parameters of the conductor surface. If the freezing phenomenon is not considered, the above-mentioned conductor setting parameters under normal conditions are used. The settings of the conductor setting parameters provided in this embodiment are shown in Table 1.

[0040] [Table 1]

[0041]

[0042]

[0043] When performing impact force analysis, it is crucial to set the spacer configuration parameters and insulator string configuration parameters. In order to ensure the stability and safety of the power line, the number of spacers, the weight of each spacer, and the configuration of the insulator string between the two towers must be determined in detail. The reasonable setting of these parameters can not only effectively support the tension of the conductor, but also affect the movement trajectory of the conductor and the impact force on the surrounding facilities when the conductor breaks. Specifically, the spacer plays a role in maintaining the stability of the conductor in the power line and preventing the conductors from contacting each other or interfering with other facilities. Reasonable spacer configuration can ensure the safe operation of the line and avoid accidents caused by conductor friction or excessive contact. At the same time, the insulator string is responsible for the electrical insulation connection between the power line and the tower. Its number and design directly affect the carrying capacity, insulation performance and overall stability of the conductor. In the model calculation, the number and weight of the spacer and insulator string are important factors affecting the movement trajectory and impact force of the conductor. By accurately measuring these parameters, the dynamic performance of the conductor in different scenarios can be simulated more accurately, and an important basis for the impact force evaluation of the railway shed tunnel can be provided. Therefore, the accurate setting of these parameters is the basis for simulation analysis and optimization design. The configuration parameters of the spacer rods and the insulator string of this embodiment are shown in Table 2.

[0044] [Table 2]

[0045]

[0046] When performing impact force analysis operations, the setting of environmental parameters also plays an important role. Environmental parameters are the ice coating parameters on the conductor surface and the windage effect parameters. These directly affect the physical properties and carrying capacity of the conductor. In addition, the influence of windage on the stress state of the conductor cannot be ignored. When considering windage, it is necessary to accurately set the windage angle (in degrees) to accurately reflect the influence of wind on the behavior of the conductor. The thickness of ice and the density of ice are important factors affecting the stability of the conductor. Snowy weather in winter often causes ice to form on the surface of the conductor, which increases the weight and wind resistance of the conductor and affects its vibration characteristics and carrying capacity. According to the thickness of ice and the density of ice, the mass of ice attached to the conductor can be estimated, and then its influence on the tension and mechanical behavior of the conductor can be calculated.

[0047] The wind deflection effect also needs to be considered in the analysis. The wind deflection angle refers to the deviation angle of the conductor under the action of wind, and its size determines the degree of lateral influence of the wind on the conductor. Different wind deflection angles will directly change the stress state of the conductor, affect the relative position of the conductor and other structures, and may cause changes in the impact force on facilities such as railway sheds. Therefore, accurate wind deflection angle data is crucial, which can help predict the deformation of the conductor under the action of wind and possible collision risks. By accurately setting these environmental parameters, the operating state of the conductor under different meteorological conditions can be more realistically simulated, providing a more accurate basis for subsequent impact force evaluation. The conductor surface icing parameters and wind deflection effect parameters provided in the embodiment of the present application are shown in Table 3.

[0048] [Table 3]

[0049]

[0050] For the structural parameters of the shed hole, this application mainly obtains the mechanical parameters of foamed concrete, the design parameters of the shed hole columns, the concrete thickness parameters, etc. as calculation samples. As the main load-bearing material of the shed hole, the performance of concrete is crucial to the stability of the structure. Foamed concrete is often used in the walls of shed holes due to its light weight and good vibration isolation characteristics. The mechanical parameters of foamed concrete include but are not limited to: the elastic modulus of foamed concrete, the density of foamed concrete, the Poisson's ratio of foamed concrete, etc.; the shed hole columns are important load-bearing components of the shed hole, and their cross-sectional design must consider mechanical properties and spatial layout. Common shed hole column design parameters include: the cross-sectional shape of the shed hole columns and the cross-sectional size of the shed hole columns; the concrete thickness parameters mainly include the shed hole concrete slab thickness parameters and the foamed concrete thickness parameters. The shed hole concrete slab thickness parameters and the foamed concrete thickness parameters are the key factors affecting the overall bearing capacity of the shed hole, especially when it needs to withstand dynamic loads. The thickness of the foamed concrete directly affects the impact force on the shed hole. The structural parameters of the shed hole provided in the embodiment of this application are shown in Table 4.

[0051] [Table 4]

[0052]

[0053] The crossing angle parameter, that is, the crossing angle between the conductor and the shed tunnel, affects the stress of the conductor and the impact risk of the shed tunnel. When the conductor crosses the shed tunnel, the crossing angle parameter needs to be accurately measured and set to evaluate the impact force that the conductor may have on the shed tunnel. The crossing angle parameter determines the geometric relationship between the conductor and the shed tunnel, usually expressed in degrees; the distance parameter, that is, the distance setting between the conductor tower and the shed tunnel, is the key to ensure that there is no interference or collision between the conductor and the shed tunnel. This vertical distance must fully consider the influence of factors such as the conductor tension and wind force on its position. Please refer to Figure 2 , which shows a schematic diagram of a cross-over transmission line and a planned railway tunnel provided in an embodiment of the present application.

[0054] In a possible implementation, step S101 also includes: setting a preset work path, the preset work path includes a simulation work path, an ANSYS software work path, and an ANSYS / LS-DYNA software work path, wherein the simulation work path is used to save impact force analysis parameters, instantaneous impact force data, and temporary data, the ANSYS software work path is used to call ANSYS software to generate corresponding parametric design codes, and the ANSYS / LS-DYNA software work path is used to call LS-DYNA for further modeling and simulation.

[0055] Specifically, the preset working path is set, and the preset working path includes the simulation working path, the ANSYS software working path, and the ANSYS / LS-DYNA software working path. For the simulation working path: a dedicated working path needs to be set during the simulation process, which is used to save all relevant input and output data and temporary files, that is, the simulation working path, such as "D:\Simulation".

[0056] For the working path of ANSYS software: Before performing the impact force analysis operation, it is necessary to ensure that the working path of ANSYS software has been correctly set so as to start the simulation program through the default installation path. Depending on the version of ANSYS, the default installation path is as follows: "C:\Program Files\ANSYS Inc\v180\ansys\bin\winx64\ANSYS180.exe". Here, v180 represents the version number of ANSYS software. In actual operation, it is necessary to ensure that the path setting is correct according to the specific version installed. The installation of different versions can be adapted by modifying the version number in the path. After completing the path setting, click the "Generate Calculation File" button. This operation will call ANSYS software to generate the corresponding parametric design code based on the impact force analysis parameters set in step S101. The generated code includes but is not limited to: geometric modeling, meshing, boundary conditions, loading conditions, etc., thereby ensuring the automation and efficient execution of the simulation process. In this process, the generated code will be directly used as the input file for subsequent simulation analysis to ensure the consistency of the simulation model and the impact force analysis parameters.

[0057] For ANSYS / LS-DYNA software working path: ANSYS / LS-DYNA is a powerful simulation tool integrated with ANSYS, which is specially used to deal with complex nonlinear problems such as large deformation, impact, collision, etc. By default, ANSYS / LS-DYNA is installed in the same directory as ANSYS software, so you can switch to the LS-DYNA executable file by changing the name of the executable program. The default path is usually as follows "C:\Program Files\ANSYSInc\v180\ansys\bin\winx64\lsdyna_dp.exe". Like the ANSYS software working path, the v180 in the path represents the version number of the software, which needs to be adjusted according to the actual installed version. At this time, the system will call LS-DYNA for further modeling and simulation based on the parametric design code file generated in the ANSYS software working path, that is, when calling the LS-DYNA software, the software will load the design code generated by the ANSYS software working path, and perform simulation calculations according to the preset physical conditions, and all simulation results will be saved to the storage path of the step preset working path. This step is a critical part of the entire simulation process because it involves actual calculations and analysis, and the results produced will be used for subsequent engineering decisions and optimization.

[0058] Step S102: obtaining a plurality of first features affecting impact force analysis calculation through impact force analysis parameters.

[0059] Specifically, according to the physical mechanism and parameter characteristics of impact force analysis, feature screening rules are defined to ensure the physical relevance, parameter measurability and sensitivity to impact force of the screening features; based on the conductor setting parameters, relevant features affecting the impact force are extracted, including parameters such as the number of splits, unit mass, elastic modulus, Poisson's ratio, ice cover and wind deviation effect, so as to quantify the impact of kinetic energy release and impact propagation after the conductor breaks; based on the shed tunnel structure parameters, the mechanical properties of foam concrete, column design and wall thickness characteristics are extracted to evaluate the absorption and transmission performance of the shed tunnel to the impact force; based on the relative position parameters, the crossing angle and distance features are extracted to analyze the influence of the relative spatial relationship from the conductor break point to the shed tunnel on the impact force distribution; by combining and transforming the above features, joint feature variables are constructed, such as "conductor mass-elastic modulus joint feature" or "crossing angle-wind deviation effect joint feature", so as to improve the feature expression ability; finally, the significance of the screened feature set for impact force analysis is verified by statistical analysis or simulation, and the low-relevance or redundant features are eliminated to generate the final first feature set, which provides input basis for subsequent sensitivity calculation and weight allocation.

[0060] Step S103, calculating the sensitivity index corresponding to each first feature, where one first feature corresponds to one sensitivity index.

[0061] Specifically, according to the number of first features acquired in step S102, the sensitivity index corresponding to each first feature is calculated respectively, and one first feature corresponds to one sensitivity index.

[0062] In a possible implementation, step S102 also includes: constructing a feature sample set of multiple first features; calculating the maximum impact force of the shelf hole based on the feature sample set and through simulation experiments; calculating the total variance and expected conditional variance corresponding to the feature sample set based on the maximum impact force of the shelf hole; and calculating the sensitivity index corresponding to each first feature based on the total variance and the expected conditional variance.

[0063] Specifically, construct a plurality of feature sample sets of the first feature, assuming that the sample set is X = (x1, x2, ..., x n), n is the number of the first feature. Then, through the sample set and according to the ANSYS / LS-DYNA software working path constructed in step S101, the maximum impact force of the shed hole is obtained through simulation experiment. The specific steps are as follows: First, make sure that the installation path of the LS-PrePost software is correctly set. Usually, the default path of the system is: "C:\ProgramFiles\LS-PrePost\4.3-x64\lsprepost4.3_x64". If different versions of LS-PrePost are used, the version number in the path may be different, and it should be adjusted according to the software version at the time of installation. Through the file import function of LS-PrePost, select the result file previously generated by ANSYS / LS-DYNA, which is usually saved with a specific extension (such as **.dat or .f06**), and load the simulation data into the post-processing environment. In LS-PrePost, by defining the physical quantity of interest (such as impact force), a time history curve of the impact force changing with time can be generated. This usually involves selecting appropriate nodes or elements, obtaining mechanical responses, and drawing a time history diagram. From the generated time history curve, the maximum instantaneous impact force value is identified and read using an automated script. The maximum impact force simulation experiment results provided by the embodiment of the present application are shown in Table 5.

[0064] [Table 5]

[0065]

[0066] Assume that the mathematical form for solving the maximum impact force of the shed hole is Y = f(X), where Y is the maximum impact force of the shed hole, and f(X) represents the functional relationship between the maximum impact force of the shed hole and the characteristic sample set. According to the maximum impact force of the shed hole, calculate the total variance M(Y) corresponding to the characteristic sample set, and ... i The conditional expectation is The expected conditional variance is Among them, x i represents the i-th first feature in the feature sample set, then Represents the value of the first feature of the i-th feature in the feature sample set, so The smaller the value, the corresponding input parameter x i When the value fluctuates, the variance of the output maximum impact force value of the hole is larger, and vice versa. The sensitivity index corresponding to each first feature is calculated by the following formula:

[0067]

[0068] Step S104: different weight parameters are configured for the multiple first features according to the sensitivity index corresponding to each first feature, and one first feature corresponds to one weight parameter.

[0069] Specifically, according to the corresponding sensitivity index calculated by each first feature, different weight parameters are configured for each first feature. First, the sensitivity index corresponding to each first feature is sorted from large to small according to the numerical value; according to the sorting result, the normalization method is used to configure different weight parameters for multiple first features, and the weight parameter assigned to the first feature with a larger sensitivity index is greater than the weight parameter assigned to the first feature with a smaller sensitivity index.

[0070] Step S105, constructing a plurality of second features according to the first feature and the weight parameter and through a preset algorithm, wherein the dimension corresponding to the second feature is greater than the dimension corresponding to the first feature.

[0071] Specifically, the multi-granularity scanning process uses sliding windows of different sizes to extract features from the original input, and can generate new features of different dimensions. That is, by combining the first feature and the corresponding sensitivity index, and then grouping the adjacent features, a second feature with a higher dimension is obtained. The dimension corresponding to the second feature is much higher than the dimension corresponding to the first feature. Please refer to Figure 3 , which shows a high-dimensional feature generation schematic diagram provided in the embodiment of the present application, wherein the number of input parameters is assumed to be n, and each first feature is multiplied by the corresponding weight parameter, the sliding window size is m, and the sliding step is l. The sliding window scans the original input feature to extract feature information, and then p new features are generated:

[0072]

[0073] Among them, k is a step factor that determines the spacing between sliding windows. Usually k will be a positive integer, which represents the step size of the window during the scanning process. If k=1, the sliding window will move one unit position each time, and there will be no jumps between windows. If k>1, there will be gaps between windows, and the scanning of the sliding window will skip some original features. The setting of this parameter affects the number of new features and the learning ability of the model. Then these p new features in the original features are input into a completely random forest and a random forest to generate the corresponding class probability vectors. Each random forest and completely random forest will give a q-dimensional class probability vector as the prediction output. Finally, these class probability vectors are connected to an r-dimensional transformed feature vector, which is the feature vector corresponding to the second feature:

[0074]

[0075] Step S106, constructing an impact force analysis model according to the plurality of second features, and calculating instantaneous impact force data of the target conductor on the target railway shed tunnel when the target conductor is broken through the impact force analysis model.

[0076] Specifically, please refer to Figure 4 , which shows a schematic diagram of a cascade forest structure provided by an embodiment of the present application. The cascade forest structure consists of multiple layers of forests. This layer-by-layer training can enhance the ability to characterize feature information. Each layer is a collection of different types of decision tree forests to promote diversity. For example, assume that each layer of the cascade consists of two black random forests and two blue completely random forests. Using different types of decision tree forests can introduce diversity, which is crucial for integrated construction. The input feature vector of the first layer of the cascade forest is the feature vector generated in the multi-granularity scanning stage. Assume that there are three categories to be predicted; therefore, each forest in the first layer of the cascade forest will output a three-dimensional class vector, which is then connected to re-represent the original input and input to the next layer of the cascade. After each layer of training is completed, the generated class vector and the original feature vector are connected as the input of the next layer. After layer-by-layer training, the last layer aggregates the four three-dimensional class vectors, takes the class with the largest aggregation value, and obtains the final prediction result, that is, the instantaneous impact force data of the target wire on the target railway shed when it breaks.

[0077] To reduce the risk of overfitting, a k-fold cross validation is performed on the class vectors generated by each forest. If there is no significant performance improvement after adding a certain number of cascaded forest layers, the training process is terminated, thus automatically determining the number of layers.

[0078] In one possible implementation, step S106 also includes: taking multiple sets of conductor setting parameters and multiple sets of relative position parameters as input, and calculating multiple sets of instantaneous impact force data of the target conductor on the target railway shed tunnel when it is broken through the impact force analysis model; obtaining the first instantaneous impact force data and the second instantaneous impact force data from the multiple sets of instantaneous impact force data, the first instantaneous impact force data and the second instantaneous impact force data being any two different sets of instantaneous impact force data from the multiple sets of instantaneous impact force data; if it is confirmed that the first instantaneous impact force data is greater than the second instantaneous impact force data, then obtaining the target conductor setting parameters and target relative position parameters input for calculating the first instantaneous impact force data; and using the target conductor setting parameters and the target relative position parameters as the optimal setting parameters.

[0079] Specifically, by changing the initial impact force analysis parameters, impact force analysis operations are performed under different analysis conditions, and multiple groups of different instantaneous impact force data are obtained. At this time, the values ​​of the instantaneous impact force data are sorted from large to small, that is, the first instantaneous impact force data and the second instantaneous impact force data in the multiple groups of instantaneous impact force data are obtained, and it is confirmed whether the first instantaneous impact force data is greater than the second instantaneous impact force data. At this time, according to the sorting result, the smallest instantaneous impact force data is obtained, and the target wire setting parameters and target relative position parameters input for calculating the minimum instantaneous impact force data are obtained; the target wire setting parameters and the target relative position parameters are used as the optimal setting parameters.

[0080] The present application adopts the above method, which is equivalent to the impact force analysis operation on the target railway shed tunnel when the target conductor is broken, and obtains the impact force analysis parameters; through the impact force analysis parameters, multiple first features that affect the impact force analysis calculation are obtained, and the sensitivity index corresponding to each first feature is calculated; different weight parameters are configured for the multiple first features according to the sensitivity index corresponding to each first feature; according to the first features and the weight parameters, and through a preset algorithm, multiple second features are constructed; according to the multiple second features, an impact force analysis model is constructed, and the instantaneous impact force data of the target conductor on the target railway shed tunnel when it is broken is calculated through the impact force analysis model, so that a high-dimensional second feature is constructed by combining multiple environmental factors, and the impact force analysis model is constructed through the second feature, so that the impact force analysis model is more accurate in calculating the instantaneous impact force data, and the problem of low calculation accuracy of the traditional model is solved.

[0081] Please refer to Figure 5 , which shows a schematic diagram of a module of a device for evaluating the impact force of a broken transmission line on a railway tunnel provided in an embodiment of the present application, the device includes an acquisition module 51 and a processing module 52, wherein:

[0082] The acquisition module 51 is used to obtain impact force analysis parameters in response to the impact force analysis operation on the target railway tunnel when the target conductor is broken. The impact force analysis parameters include conductor setting parameters corresponding to the target conductor, tunnel structure parameters corresponding to the target railway tunnel, and relative position parameters; through the impact force analysis parameters, multiple first features that affect the impact force analysis calculation are obtained.

[0083] The processing module 52 is used to calculate the sensitivity index corresponding to each first feature, one first feature corresponds to one sensitivity index; according to the sensitivity index corresponding to each first feature, different weight parameters are configured for multiple first features, one first feature corresponds to one weight parameter; according to the first features and the weight parameters, and through a preset algorithm, multiple second features are constructed, and the dimension corresponding to the second feature is greater than the dimension corresponding to the first feature; an impact force analysis model is constructed according to the multiple second features, and the instantaneous impact force data of the target conductor on the target railway shed tunnel when it is broken is calculated through the impact force analysis model.

[0084] In a possible implementation, the acquisition module 51 is used to respond to the impact force analysis operation on the target railway shed when the target conductor is broken, and before obtaining the impact force analysis parameters, the method also includes: setting a preset working path, the preset working path includes a simulation working path, an ANSYS software working path and an ANSYS / LS-DYNA software working path, wherein the simulation working path is used to save impact force analysis parameters, instantaneous impact force data and temporary data, the ANSYS software working path is used to call the ANSYS software to generate corresponding parametric design codes, and the ANSYS / LS-DYNA software working path is used to call LS-DYNA for further modeling and simulation.

[0085] In a possible implementation, the acquisition module 51 is used to obtain the conductor setting parameters, shed tunnel structure parameters and relative position parameters in the impact force analysis parameters, specifically including: obtaining the conductor splitting number parameter, the unit mass parameter, the density parameter, the elastic modulus parameter, the Poisson's ratio parameter, the diameter parameter, the spacer configuration parameter, the insulator string configuration parameter, the conductor surface icing parameter and the windage effect parameter, and using them as the conductor setting parameters; obtaining the foam concrete mechanical parameters, the shed tunnel column design parameters and the concrete thickness parameters, and using them as the shed tunnel structure parameters; obtaining the crossing angle parameters and the distance parameters, and using them as the relative position parameters.

[0086] In a possible implementation, the processing module 52 is used to calculate the sensitivity index corresponding to each first feature, specifically including: constructing a feature sample set of multiple first features; calculating the maximum impact force of the shelf hole based on the feature sample set and through a simulation experiment; calculating the total variance and expected conditional variance corresponding to the feature sample set based on the maximum impact force of the shelf hole; and calculating the sensitivity index corresponding to each first feature based on the total variance and the expected conditional variance.

[0087] In a possible implementation, the processing module 52 is used to calculate the sensitivity index corresponding to each first feature according to the total variance and the expected conditional variance, specifically including: calculating the sensitivity index corresponding to each first feature according to the following formula:

[0088]

[0089] Among them, Y is the maximum impact force of the shed hole, X is the feature sample set of the first feature, represents the value of the i-th first feature in the feature sample set, n is the number of first features, T i is the sensitivity index corresponding to the i-th first feature, M(Y) is the total variance, N -i (E i (Y|x -i )) is the conditional expected variance of the joint distribution corresponding to the i-th first feature.

[0090] In a possible implementation, the processing module 52 is used to configure different weight parameters for multiple first features according to the sensitivity index corresponding to each first feature, specifically including: sorting the sensitivity index corresponding to each first feature from large to small according to the numerical value; and configuring different weight parameters for multiple first features according to the sorting result.

[0091] In a possible implementation, the processing module 52 is used to construct an impact force analysis model according to multiple second features, and after calculating the instantaneous impact force data of the target conductor on the target railway shed when it is broken through the impact force analysis model, the method also includes: taking multiple sets of conductor setting parameters and multiple sets of relative position parameters as input, and calculating multiple sets of instantaneous impact force data of the target conductor on the target railway shed when it is broken through the impact force analysis model; obtaining the first instantaneous impact force data and the second instantaneous impact force data from the multiple sets of instantaneous impact force data, the first instantaneous impact force data and the second instantaneous impact force data are any two different sets of instantaneous impact force data from the multiple sets of instantaneous impact force data; if it is confirmed that the first instantaneous impact force data is greater than the second instantaneous impact force data, then obtaining the target conductor setting parameters and the target relative position parameters input for calculating the first instantaneous impact force data; and using the target conductor setting parameters and the target relative position parameters as the optimal setting parameters.

[0092] It should be noted that: when the device provided in the above embodiment realizes its function, only the division of the above functional modules is used as an example. In actual application, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the device and method embodiments provided in the above embodiment belong to the same concept, and the specific implementation process is detailed in the method embodiment, which will not be repeated here.

[0093] The present application also provides an electronic device. Figure 6 , Figure 66 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device may include: at least one processor 601, at least one communication bus 602, a user interface 603, at least one network interface 604, and a memory 605.

[0094] The communication bus 602 is used to realize the connection and communication between these components.

[0095] The user interface 603 may include a display screen (Display) and a camera (Camera), and the optional user interface 603 may also include a standard wired interface and a wireless interface.

[0096] The network interface 604 may optionally include a standard wired interface or a wireless interface (such as a WI-FI interface).

[0097] Among them, the processor 601 may include one or more processing cores. The processor 601 uses various interfaces and lines to connect various parts in the entire server, and executes various functions of the server and processes data by running or executing instructions, programs, code sets or instruction sets stored in the memory 605, and calling data stored in the memory 605. Optionally, the processor 601 can be implemented in at least one hardware form of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field-Programmable Gate Array, FPGA), and programmable logic array (Programmable Logic Array, PLA). The processor 601 can integrate one or more combinations of a central processing unit (Central Processing Unit, CPU), a graphics processing unit (Graphics Processing Unit, GPU) and a modem. Among them, the CPU mainly processes the operating system, user interface and application programs; the GPU is responsible for rendering and drawing the content to be displayed on the display screen; the modem is used to process wireless communications. It can be understood that the above-mentioned modem may not be integrated into the processor 601, and it can be implemented by a single chip.

[0098] Among them, the memory 605 may include a random access memory (Random Access Memory, RAM) and may also include a read-only memory (Read-Only Memory). Optionally, the memory 605 includes a non-transitory computer-readable storage medium. The memory 605 can be used to store instructions, programs, codes, code sets or instruction sets. The memory 605 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playback function, an image playback function, etc.), instructions for implementing the above-mentioned various method embodiments, etc.; the data storage area may store data involved in the above-mentioned various method embodiments, etc. The memory 605 may optionally be at least one storage device located away from the aforementioned processor 601. Refer to Figure 6 , the memory 605 as a computer storage medium may include an operating system, a network communication module, a user interface module, and an application for evaluating the impact force of a broken power transmission line on a railway tunnel.

[0099] exist Figure 6 In the electronic device shown, the user interface 603 is mainly used to provide an input interface for the user and obtain the data input by the user; and the processor 601 can be used to call the impact force assessment application of the broken transmission line on the railway shed tunnel stored in the memory 605. When executed by one or more processors 601, the electronic device executes one or more of the methods described in the above embodiments. It should be noted that for the aforementioned method embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited to the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required for the present application.

[0100] The present application also provides a computer-readable storage medium, which stores instructions. When executed by one or more processors, the electronic device executes one or more of the methods described in the above embodiments.

[0101] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0102] In the several embodiments provided in this application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some service interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

[0103] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0104] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0105] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a memory and includes several instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the various embodiments of the present application. The aforementioned memory includes: various media that can store program codes, such as USB flash drives, mobile hard drives, magnetic disks or optical disks.

[0106] The above are only exemplary embodiments disclosed in this application, and the scope of the disclosure of this application cannot be limited by this. That is, any equivalent changes and modifications made according to the teachings disclosed in this application are still within the scope of the disclosure of this application. After considering the disclosure of the specification and the truth of practice, those skilled in the art will easily think of other implementation schemes disclosed in this application.

[0107] This application is intended to cover any modifications, uses or adaptive changes disclosed in this application, which follow the general principles disclosed in this application and include common knowledge or customary technical means in the technical field not recorded in this application.

Claims

1. A method for evaluating the impact force of a broken transmission line on a railway tunnel, characterized in that: The method comprises: In response to an impact force analysis operation on a target railway shed when a target conductor is broken, an impact force analysis parameter is acquired, wherein the impact force analysis parameter includes a conductor setting parameter corresponding to the target conductor, a shed structure parameter corresponding to the target railway shed, and a relative position parameter; Acquire a plurality of first features that affect impact force analysis calculation through the impact force analysis parameters; Calculate a sensitivity index corresponding to each of the first features, wherein one of the first features corresponds to one of the sensitivity indexes; According to the sensitivity index corresponding to each of the first features, different weight parameters are configured for the plurality of first features, where one first feature corresponds to one weight parameter; According to the first feature and the weight parameter, a plurality of second features are constructed by a preset algorithm, wherein the dimension corresponding to the second feature is greater than the dimension corresponding to the first feature; An impact force analysis model is constructed according to the plurality of the second features, and instantaneous impact force data of the target conductor on the target railway shed tunnel when the target conductor is broken is calculated by using the impact force analysis model.

2. The method according to claim 1, characterized in that Before obtaining the impact force analysis parameters in response to the impact force analysis operation on the target railway shed tunnel when the target conductor is broken, the method further includes: A preset working path is set, and the preset working path includes a simulation working path, an ANSYS software working path, and an ANSYS / LS-DYNA software working path, wherein the simulation working path is used to save the impact force analysis parameters, the instantaneous impact force data, and temporary data, the ANSYS software working path is used to call the ANSYS software to generate corresponding parameterized design codes, and the ANSYS / LS-DYNA software working path is used to call LS-DYNA for further modeling and simulation.

3. The method according to claim 1, characterized in that: Obtaining the conductor setting parameters, shed hole structure parameters and relative position parameters in the impact force analysis parameters specifically includes: Obtaining a conductor splitting number parameter, a conductor unit mass parameter, a conductor density parameter, a conductor elastic modulus parameter, a conductor Poisson's ratio parameter, a conductor diameter parameter, a spacer configuration parameter, an insulator string configuration parameter, a conductor surface icing parameter, and a windage effect parameter, and using these as the conductor setting parameters; Obtaining foam concrete mechanical parameters, shed hole column design parameters and concrete thickness parameters as the shed hole structural parameters; The intersection angle parameter and the distance parameter are obtained and used as the relative position parameter.

4. The method according to claim 1, characterized in that: The calculating the sensitivity index corresponding to each of the first features specifically includes: Constructing a plurality of feature sample sets of the first features; According to the characteristic sample set, the maximum impact force of the shed hole is calculated through simulation experiments; According to the maximum impact force of the shed hole, the total variance and the expected conditional variance corresponding to the characteristic sample set are calculated respectively; The sensitivity index corresponding to each of the first features is calculated according to the total variance and the expected conditional variance.

5. The method according to claim 4, characterized in that Calculating the sensitivity index corresponding to each of the first features according to the total variance and the expected conditional variance specifically includes: The sensitivity index corresponding to each of the first features is calculated by the following formula: Wherein, Y is the maximum impact force of the shed hole, X is the feature sample set of the first feature, and f(X) represents the functional relationship between the maximum impact force of the shed hole and the feature sample set. represents the value of the i-th first feature in the feature sample set, n is the number of the first features, T i is the sensitivity index corresponding to the i-th first feature, M(Y) is the total variance, N -i (E i (Y|x -i )) is the conditional expected variance of the joint distribution corresponding to the i-th first feature.

6. The method according to claim 1, characterized in that The configuring different weight parameters for the plurality of first features according to the sensitivity index respectively corresponding to each of the first features specifically includes: Sort the sensitivity indexes corresponding to each of the first features from large to small according to their values; According to the sorting result, different weight parameters are configured for the plurality of first features.

7. The method according to claim 1, characterized in that After constructing the impact force analysis model according to the plurality of the second features, and calculating the instantaneous impact force data of the target conductor on the target railway shed tunnel when the target conductor is broken by using the impact force analysis model, the method further includes: Taking multiple sets of the conductor setting parameters and multiple sets of the relative position parameters as input, the impact force analysis model is used to calculate multiple sets of instantaneous impact force data of the target conductor on the target railway shed tunnel when the target conductor is broken; Acquire a first instantaneous impact force data and a second instantaneous impact force data from the plurality of sets of instantaneous impact force data, wherein the first instantaneous impact force data and the second instantaneous impact force data are any two different sets of instantaneous impact force data from the plurality of sets of instantaneous impact force data; If it is confirmed that the first instantaneous impact force data is greater than the second instantaneous impact force data, then obtaining the target wire setting parameters and target relative position parameters input for calculating the first instantaneous impact force data; The target wire setting parameters and the target relative position parameters are used as optimal setting parameters.

8. A device for evaluating the impact force of a broken transmission line on a railway tunnel, characterized in that: The device comprises an acquisition module and a processing module, wherein: The acquisition module is used to obtain impact force analysis parameters in response to the impact force analysis operation on the target railway shed when the target conductor is broken, wherein the impact force analysis parameters include conductor setting parameters corresponding to the target conductor, shed structure parameters and relative position parameters corresponding to the target railway shed; and obtain multiple first features that affect the impact force analysis calculation through the impact force analysis parameters; The processing module is used to calculate the sensitivity index corresponding to each of the first features, one first feature corresponds to one sensitivity index; according to the sensitivity index corresponding to each of the first features, different weight parameters are configured for multiple first features, one first feature corresponds to one weight parameter; according to the first features and the weight parameters, and through a preset algorithm, multiple second features are constructed, and the dimension corresponding to the second features is greater than the dimension corresponding to the first features; an impact force analysis model is constructed according to the multiple second features, and the instantaneous impact force data of the target conductor on the target railway shed when it is broken is calculated through the impact force analysis model.

9. An electronic device, characterized in that: It includes a processor, a communication bus, a user interface, a network interface and a memory, wherein the memory is used to store instructions, the user interface and the network interface are used to communicate with other devices, and the processor is used to execute the instructions stored in the memory so that the electronic device executes the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores instructions, and when the instructions are executed, the method according to any one of claims 1 to 7 is performed.

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