A method and device for evaluating impact force of broken power transmission conductor on railway shed hole

Abstract

The application provides a method and device for evaluating the impact force of a broken power transmission conductor on a railway shed tunnel, and relates to the field of computer simulation. The method comprises: in response to an impact force analysis operation of a target conductor on a target railway shed tunnel when the conductor is broken, obtaining impact force analysis parameters; obtaining a plurality of first characteristics affecting the impact force analysis calculation through the impact force analysis parameters; calculating a sensitivity index corresponding to each first characteristic; configuring different weight parameters for the plurality of first characteristics according to the sensitivity index corresponding to each first characteristic; constructing a plurality of second characteristics according to the first characteristics and the weight parameters through a preset algorithm; constructing an impact force analysis model according to the plurality of second characteristics, and calculating the instantaneous impact force data of the target conductor on the target railway shed tunnel when the conductor is broken through the impact force analysis model. The application solves the problem of low calculation accuracy of instantaneous impact force data when only traditional modeling methods are used in combination with multiple environmental factors.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of computer simulation, and particularly relates to a method and device for evaluating impact force of a broken power transmission conductor on a railway shed tunnel. BACKGROUND

[0002] After the power transmission conductor is broken, its motion characteristics show significant nonlinear dynamic characteristics due to the action of air resistance. This is a major challenge in current engineering and scientific research.

[0003] To solve this problem, the common numerical modeling methods mainly include two kinds: one is a continuous medium model based on partial differential equations, which can accurately describe the complex deformation and stress distribution of the conductor during the breaking process; the other is a discrete particle model based on ordinary differential equations, which usually uses a damping spring or a ball and rod structure 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 field, gravity, wind load, etc., making its motion present complex nonlinear behavior. Therefore, when multiple environmental factors are combined, only through the above traditional modeling method, the instantaneous impact force data of the broken power transmission conductor on the railway shed tunnel cannot be accurately calculated, and there is a problem of low model calculation accuracy.

[0004] Therefore, there is an urgent need for a method and device for evaluating impact force of a broken power transmission conductor on a railway shed tunnel. SUMMARY

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

[0006] The first aspect of the application provides a method for evaluating the impact force of a broken power transmission conductor on a railway shed tunnel, the method comprising: in response to an impact force analysis operation of a target conductor on a target railway shed tunnel when the target conductor is broken, obtaining impact force analysis parameters, the impact force analysis parameters including conductor setting parameters corresponding to the target conductor, shed tunnel structure parameters corresponding to the target railway shed tunnel, and relative position parameters; obtaining a plurality of first features affecting 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 the plurality of first features according to the sensitivity index corresponding to each first feature, one first feature corresponding to one weight parameter; constructing a plurality of second features according to the first features and the weight parameters, and through a preset algorithm, the dimension of the second features is greater than that of the first features; constructing an impact force analysis model according to the plurality of 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 through the impact force analysis model.

[0007] Optionally, before obtaining the impact force analysis parameters in response to the impact force analysis operation of the target conductor on the target railway shed tunnel when the target conductor is broken, the method further comprises: 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 the impact force analysis parameters, the instantaneous impact force data, and the temporary data, the ANSYS software working path is used to call the ANSYS software to generate the corresponding parameterized design code, and the ANSYS / LS-DYNA software working path is used to call the LS-DYNA for further modeling and simulation.

[0008] Optionally, the conductor setting parameters, the shed tunnel structure parameters, and the relative position parameters in the impact force analysis parameters specifically include: obtaining the number of conductor sections, the unit mass of the conductor, the density of the conductor, the elastic modulus of the conductor, the Poisson's ratio of the conductor, the diameter of the conductor, the spacer configuration parameter, the insulator string configuration parameter, the conductor surface icing parameter, and the wind bias effect parameter as the conductor setting parameters; obtaining the foam concrete mechanical parameters, the shed tunnel column design parameters, and the concrete thickness parameters as the shed tunnel structure parameters; and obtaining the intersection angle parameter and the distance parameter as the relative position parameters.

[0009] Optionally, calculating the sensitivity index corresponding to each first feature specifically includes: constructing a feature sample set of the plurality of first features; calculating the maximum impact force of the shed tunnel according to the feature sample set and through the simulation experiment; calculating the total variance and the expected conditional variance corresponding to the feature sample set according to the maximum impact force of the shed tunnel; and calculating the sensitivity index corresponding to each first feature according to the total variance and the expected conditional variance.

[0010] Optionally, based on the total variance and the expected conditional variance, the sensitivity index corresponding to each first feature is calculated, specifically including: calculating the sensitivity index corresponding to each first feature using the following formula:

[0011] ;

[0012] in, The maximum impact force of the tunnel, The set of feature samples for the first feature. Represents the first in the feature sample set The value of the first feature, The number of the first feature, For the first The sensitivity index corresponding to the first feature. For the total variance, To exclude the first The conditional expected variance of the joint distribution corresponding to each of the first features.

[0013] Optionally, different weight parameters are configured for multiple first features based on the sensitivity index corresponding to each first feature. Specifically, this includes: sorting the sensitivity indices corresponding to each first feature in descending order of value; and configuring different weight parameters for multiple first features based on the sorting results.

[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 tunnel at the time of fracture using the impact force analysis model, the method further includes: taking multiple sets of conductor setting parameters and multiple sets of relative position parameters as input, calculating multiple sets of instantaneous impact force data of the target conductor on the target railway tunnel at the time of fracture using the impact force analysis model; acquiring the first instantaneous impact force data and the second instantaneous impact force data from the multiple 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 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 acquiring the target conductor setting parameters and the target relative position parameters used to calculate 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] A second aspect of this application provides a device for assessing the impact force of a broken power transmission line on a railway tunnel. The device includes an acquisition module and a processing module, wherein...

[0016] The acquisition module is configured to acquire impact force analysis parameters in response to an operation of analyzing an impact force of a target railway shed tunnel when a target conductor is broken, the impact force analysis parameters including conductor setting parameters corresponding to the target conductor, shed tunnel structure parameters corresponding to the target railway shed tunnel, and relative position parameters; and the first features affecting the impact force analysis calculation are acquired based on the impact force analysis parameters.

[0017] The processing module is configured to calculate a sensitivity index corresponding to each of the first features, one of the first features corresponding to one of the sensitivity indexes; configure different weight parameters for the first features based on the sensitivity indexes corresponding to the first features, one of the first features corresponding to one of the weight parameters; construct second features based on the first features and the weight parameters and by using a preset algorithm, the second features corresponding to a dimension greater than that of the first features; construct an impact force analysis model based on the second features, and calculate instantaneous impact force data of the target railway shed tunnel when the target conductor is broken by using the impact force analysis model.

[0018] In a third aspect of the present application, an electronic device is provided, which includes a processor, a memory, a user interface, and a network interface. The memory is configured to store instructions, the user interface and the network interface are configured to communicate with other devices, and the processor is configured to execute the instructions stored in the memory to enable the electronic device to perform the method of any one of the above aspects.

[0019] In a fourth aspect of the present application, a computer-readable storage medium is provided, which stores a computer program. The computer program is configured to enable a processor to perform the method of any one of the above aspects.

[0020] The 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 an operation of analyzing an impact force of a target railway shed tunnel when a target conductor is broken is performed, impact force analysis parameters are acquired; first features affecting the impact force analysis calculation are acquired based on the impact force analysis parameters, and a sensitivity index corresponding to each of the first features is calculated; different weight parameters are configured for the first features based on the sensitivity indexes corresponding to the first features; second features are constructed based on the first features and the weight parameters and by using a preset algorithm; an impact force analysis model is constructed based on the second features, and instantaneous impact force data of the target railway shed tunnel when the target conductor is broken is calculated by using the impact force analysis model. Thus, by constructing high-dimensional second features in combination with multiple environmental factors and constructing an impact force analysis model based on the second features, the impact force analysis model is more accurate in calculating the instantaneous impact force data, and the problem of low calculation accuracy of a traditional model is solved.

[0022] 2. By setting a plurality of different impact force analysis parameters, including conductor setting parameters, target railway shed hole corresponding shed hole structure parameters, relative position parameters, etc., a foundation is provided for accurate simulation analysis and optimization design in combination with various factors.

[0023] 3. Due to the numerous factors affecting the behavior of the conductor and the impact force, including the complex interaction of physical, environmental and structural parameters, the change of a single parameter may have a significant impact on the analysis results, so by configuring different sensitivity parameters for different first features, the calculation resources can also be reasonably allocated to different calculation parameters during the design process to improve the efficiency of railway shed hole impact force analysis. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a flowchart of a method for evaluating the impact force of a broken power transmission conductor on a railway shed hole provided by an embodiment of the present application;

[0025] Figure 2 is a schematic diagram of a cross-over power transmission conductor and a proposed railway shed hole provided by an embodiment of the present application;

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

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

[0028] Figure 5 is a module schematic diagram of an impact force evaluation device for a broken power transmission conductor on a railway shed hole provided by an embodiment of the present application;

[0029] Figure 6 is a schematic diagram of the structure of an electronic device provided by an embodiment of the present application.

[0030] BRIEF DESCRIPTION OF DRAWINGS DETAILED DESCRIPTION

[0031] In order for those skilled in the art to better understand the technical solutions in the specification, the technical solutions in the specification will be described clearly and completely in conjunction with the drawings in the embodiments of the specification. Obviously, the described embodiments are only a part of the embodiments of the present application, not all embodiments.

[0032] The terminology used in the following embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in the description of the application, the singular forms "a", "an" and "the" are intended to include plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "and / or", as used in the present application, signify and include any and all possible combinations of one or more of the associated listed items.

[0033] Hereinafter, the terms "first", "second" are only for the purpose of description, and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features, and in the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise specified.

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

[0035] Please refer to Figure 1 which shows a flowchart of a method for evaluating the impact force of a broken power transmission conductor on a railway shed tunnel according to an embodiment of the present application. The flowchart mainly includes the following steps: S101 to S106.

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

[0037] Specifically, taking the 1000kV conductor of Shangqiu-Hangzhou railway Huanan line as an example, the impact force of the target conductor on the railway shed tunnel when the target conductor is broken is analyzed. First, the impact force analysis parameters are obtained, including the conductor setting parameters corresponding to the target conductor, the shed structure parameters corresponding to the target railway shed tunnel and the relative position parameters.

[0038] In one possible implementation, step S101 further includes: obtaining the number of conductor sections parameter, the unit mass parameter of the conductor, the density parameter of the conductor, the elastic modulus parameter of the conductor, the Poisson's ratio parameter of the conductor, the diameter parameter of the conductor, the spacer rod configuration parameter, the insulator string configuration parameter, the conductor surface icing parameter and the wind deflection effect parameter as the conductor setting parameters; obtaining the foam concrete mechanical parameter, the shed column design parameter and the concrete thickness parameter as the shed structure parameters; obtaining the intersection angle parameter and the distance parameter as the relative position parameters

[0039] Specifically, at this stage, it is first necessary to set the relevant physical parameters, i.e., the conductor setting parameters corresponding to the target conductor. Specifically, including but not limited to: the number of sub-conductors parameter, the unit mass parameter of the conductor, the density parameter of the conductor, the elastic modulus parameter of the conductor, the Poisson's ratio parameter of the conductor, the diameter parameter of the conductor, the spacer configuration parameter, the insulator string configuration parameter, the windage effect parameter, etc. If the impact of icing weather on the conductor is considered, the unit weight and density of the conductor under icing conditions, i.e., the conductor icing surface parameter, also need to be input. If the icing phenomenon is not considered, the above conductor setting parameters under normal conditions are used. The setting of the conductor setting parameters provided by the present embodiment is shown in Table 1.

[0040] [Table 1]

[0041]

[0042] When performing the impact force analysis operation, it is crucial to set the spacer configuration parameter and the insulator string configuration parameter. In order to ensure the stability and safety of the power line, it is necessary to determine in detail the number of spacers, the single weight, and the configuration of the insulator string between the two towers. Reasonable setting of these parameters not only effectively supports the tension of the conductor, but also affects 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, avoiding mutual contact of the conductors or interference with other facilities in the power line. 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, and its number and design directly affect the carrying capacity of the conductor, the insulation performance, and the overall stability of the system. In model calculation, the number and weight of the spacers and the insulator strings are important factors affecting the movement trajectory of the conductor and the size of the impact force. By accurately measuring these parameters, the dynamic performance of the conductor under different situations can be more accurately simulated, and important basis for the impact force evaluation of the railway shed tunnel is provided. Therefore, accurate setting of these parameters is the basis for simulation analysis and optimization design. The spacer configuration parameter and the insulator string configuration parameter of the present embodiment are shown in Table 2.

[0043] [Table 2]

[0044]

[0045] When performing the impact force analysis operation, the setting of environmental parameters is also important. The environmental parameters are conductor surface icing parameters and 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, the windage angle (in degrees) needs to be accurately set in order to accurately reflect the influence of wind force on the behavior of the conductor. The thickness of the ice and the density of the ice are important factors affecting the stability of the conductor. Winter snow weather often causes ice layers to form on the surface of the conductor, increasing the weight and wind resistance of the conductor, affecting its vibration characteristics and carrying capacity. According to the thickness of the ice and the density of the ice, the mass of the ice attached to the conductor can be estimated, and then the influence of the ice on the tension and mechanical behavior of the conductor can be calculated.

[0046] The windage effect also needs to be considered in the analysis. The windage angle refers to the deflection angle of the conductor under the action of wind force, and its size determines the degree of lateral influence of wind force on the conductor. Different windage angles will directly change the stress state of the conductor, affect the relative position of the conductor and other structures, and then may cause changes in the impact force on railway sheds and other facilities. Therefore, accurate windage angle data is crucial, as it can help predict the deformation of the conductor under the action of wind force and the possible collision risk. By accurately setting these environmental parameters, the running state of the conductor under different meteorological conditions can be more realistically simulated, providing more accurate basis for subsequent impact force evaluation. The conductor surface icing parameters and windage effect parameters provided by the embodiments of the present application are shown in Table 3.

[0047] [Table 3]

[0048]

[0049] For shed structure parameters, the present application mainly obtains foam concrete mechanical parameters, shed column design parameters, concrete thickness parameters, etc. as calculation samples. Concrete, as the main load-bearing material of the shed, its performance is crucial to the stability of the structure. Foam concrete is often used in the walls of the shed due to its light weight and good vibration isolation characteristics. Foam concrete mechanical parameters include but are not limited to: elastic modulus of foam concrete, density of foam concrete, Poisson's ratio of foam concrete, etc.; shed column, as an important load-bearing component of the shed, its cross-sectional design must consider mechanical properties and spatial layout. Common shed column design parameters include: cross-sectional shape of shed column and cross-sectional size of shed column; concrete thickness parameters mainly include shed concrete slab thickness parameters and foam concrete thickness parameters. Shed concrete slab thickness parameters and foam concrete thickness parameters are key factors affecting the overall carrying capacity of the shed, especially in the case of needing to bear dynamic load, the thickness of the foam concrete directly affects the impact force on the shed. The shed structure parameters provided by the embodiments of the present application are shown in Table 4.

[0050] [Table 4]

[0051]

[0052] The crossing angle parameter, i.e. the crossing angle between the conductor and the shed tunnel, affects the stress condition 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 generate on the shed tunnel. The crossing angle parameter determines the geometric relationship of the conductor intersecting with the shed tunnel, and is usually expressed in degrees. The distance parameter, i.e. the distance between the conductor tower and the shed tunnel, is the key to ensure that the conductor and the shed tunnel do not interfere or collide with each other. This vertical distance must fully consider the influence of factors such as the tension of the conductor and the wind force on its position. Please refer to Figure 2 which shows a schematic diagram of a crossing spanning power transmission conductor and a proposed railway shed tunnel according to an embodiment of the present application.

[0053] In a possible implementation, the step S101 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 parameterized design code, and the ANSYS / LS-DYNA software working path is used to call LS-DYNA for further modeling and simulation.

[0054] Specifically, the 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. Among them, for the simulation working path: a special working path needs to be set in the simulation process, which is specially used to save all related input, output data and temporary files, i.e. the simulation working path, for example "D:\ Simulation".

[0055] For the ANSYS software working path: Before performing the impact force analysis operation, it is necessary to ensure that the working path of the ANSYS software is correctly set, so as to start the simulation program through the default installation path. According to different versions 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 the ANSYS software. In actual operation, it is necessary to ensure that the path is correctly set according to the specific version installed. Different versions of installation 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., so as to ensure 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, ensuring the consistency of the simulation model and the impact force analysis parameters.

[0056] For the ANSYS / LS-DYNA software working path: ANSYS / LS-DYNA is a powerful simulation tool integrated with ANSYS, which is specially used to handle 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 it can be switched to the execution file of LS-DYNA by changing the name of the execution program. The default path is usually as follows: "C:\Program Files\ANSYS Inc\v180\ansys\bin\winx64\lsdyna_dp.exe". Like the ANSYS software working path, 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 based on the parametric design code file generated in the ANSYS software working path to perform further modeling and simulation, 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 calculation according to the preset physical conditions. All simulation results will be saved to the storage path of the step preset working path. This step is the key part of the entire simulation process, because it involves actual calculation and analysis, and the results will be used for subsequent engineering decision and optimization.

[0057] In step S102, a plurality of first features affecting the impact force analysis calculation are obtained through the impact force analysis parameters.

[0058] Specifically, according to the physical mechanism and parameter characteristics of the impact force analysis, the characteristic screening rules are defined to ensure the physical relevance, parameter measurability and sensitivity of the impact force of the screened features; the related features affecting the impact force are extracted based on the conductor setting parameters, including the number of branches, unit mass, elastic modulus, Poisson's ratio, icing and wind deflection effect parameters, to quantify the influence of kinetic energy release and impact propagation after the conductor breaks; the mechanical properties of foam concrete, column design and wall thickness features are extracted based on the shed structure parameters to evaluate the impact force absorption and transmission performance of the shed; the crossing angle and distance features are extracted based on the relative position parameters to analyze the influence of the relative spatial relationship of the conductor breaking point to the shed on the impact force distribution; through multi-feature combination and conversion of the above features, joint feature variables such as "conductor mass-elastic modulus joint feature" or "crossing angle-wind deflection effect joint feature" are constructed to improve the feature expression capability; finally, the significance of the screened feature set to the impact force analysis is verified through statistical analysis or simulation, and the features with low correlation or redundancy are removed to generate the final first feature set, which provides input basis for subsequent sensitivity calculation and weight allocation.

[0059] In step S103, a sensitivity index corresponding to each first feature is calculated, and one first feature corresponds to one sensitivity index.

[0060] Specifically, according to the number of first features obtained in step S102, the sensitivity index corresponding to each first feature is calculated, and one first feature corresponds to one sensitivity index.

[0061] In one possible implementation, step S102 further includes: constructing a feature sample set of a plurality of first features; calculating the maximum impact force of the shed according to the feature sample set and through simulation simulation experiment; calculating the total variance and the expected conditional variance corresponding to the feature sample set according to the maximum impact force of the shed; calculating the sensitivity index corresponding to each first feature according to the total variance and the expected conditional variance.

[0062] Specifically, the feature sample set of a plurality of first features is constructed, and it is assumed that the sample set is , is the number of first features. Then, the maximum impact force of the shed tunnel is obtained through simulation experiment according to the working path of ANSYS / LS-DYNA software constructed in step S101, and the specific steps are as follows: first, ensure that the installation path of LS-PrePost software is correctly set. Generally, the default path of the system is: "C:\Program Files\LS-PrePost\4.3-x64\lsprepost4.3_x64". If a different version of LS-PrePost is used, the version number in the path may be different, and the specific adjustment should be made according to the software version during installation. Through the file import function of LS-PrePost, the result file generated by ANSYS / LS-DYNA before is selected, which is usually saved with a specific extension (such as **.dat or.f06**), and the simulation data is loaded into the post-processing environment. In LS-PrePost, by defining the physical quantity of interest (such as impact force), a time history curve of impact force with time can be generated. This usually involves selecting appropriate nodes or elements, obtaining mechanical response, and plotting a time history graph. From the generated time history curve, identify and use an automated script to read the maximum instantaneous impact force value. The simulation experiment result of the maximum impact force provided by the embodiment of the present application is shown in Table 5.

[0063] [Table 5]

[0064]

[0065] Suppose the mathematical form of solving the maximum impact force of the shed tunnel is is the maximum impact force of the shed tunnel, represents the functional relationship between the maximum impact force of the shed tunnel and the characteristic sample set. According to the maximum impact force of the shed tunnel, the total variance corresponding to the characteristic sample set is calculated respectively , and the conditional expectation except is , then the expected conditional variance is , wherein represents the first feature in the characteristic sample set , then represents the value of the first feature in the characteristic sample set , and it is known that is smaller, then the variance of the output value of the maximum impact force of the shed tunnel changes more when the input parameter value fluctuates, otherwise, it is smaller. Thus, the sensitivity index corresponding to each first feature is calculated by the following formula:

[0066]

[0067] ​​Step S104, according to the sensitivity index corresponding to each first feature respectively, configure different weight parameters for the plurality of first features, one first feature corresponds to one weight parameter.

[0068] Specifically, according to the corresponding sensitivity index calculated by each first feature respectively, different weight parameters are configured for each first feature. First, the sensitivity index corresponding to each first feature is sorted in descending order of numerical value. According to the sorting result, different weight parameters are configured for the plurality of first features by using the normalization method. The weight parameter allocated to the first feature with a larger sensitivity index is greater than the weight parameter allocated to the first feature with a smaller sensitivity index.

[0069] Step S105, according to the first feature and the weight parameter, and by a preset algorithm, a plurality of second features are constructed, the dimension corresponding to the second feature is greater than the dimension corresponding to the second feature.

[0070] Specifically, the multi-granularity scanning process uses different size sliding windows to extract features from the original input, which can generate new features of different dimensions. That is, by combining the first feature and the corresponding sensitivity index, and grouping by adjacent features, a second feature with higher dimension is obtained, and 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 diagram provided by an embodiment of the present application, wherein the number of input parameters is assumed to be , and each first feature is multiplied by the corresponding weight parameter, the size of the sliding window is , and the sliding step is l. The sliding window scans the original input feature to extract feature information, and then generates new features:

[0071] ;

[0072] wherein, is a step factor that determines the distance between the sliding windows. Usually k will be a positive integer, indicating the step of the window in the scanning process. If , then the sliding window will move one unit position each time, and there is no jump between the windows. If , then there will be a gap between the windows, and 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 input the new features in the original feature into a completely random forest and a random forest to generate the corresponding class probability vector. Each random forest and completely random forest will give a dimension class probability vector as the prediction output, and finally these class probability vectors are connected to a The feature vector after the dimension transformation is the feature vector corresponding to the second feature: The feature vector after the dimension transformation is the feature vector corresponding to the second feature:

[0073] .

[0074] In step S106, an impact force analysis model is constructed according to the plurality of second features, and the instantaneous impact force data of the target conductor on the target railway shed when the target conductor is broken is calculated through the impact force analysis model.

[0075] Specifically, please refer to Figure 4 which shows a cascading forest structure diagram provided by the embodiment of the present application. The cascading forest structure is composed of multiple layers of forests. This layer-by-layer training can enhance the representation ability of 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 is composed 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 ensemble construction. The input feature vector of the first layer of the cascading 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 cascading forest will output a three-dimensional class vector, which is then concatenated to re-represent the original input and input to the next layer of the cascade. After each layer is trained, the generated class vector and the original feature vector are concatenated 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, i.e., the instantaneous impact force data of the target conductor on the target railway shed when the target conductor is broken.

[0076] To reduce the risk of overfitting, k-fold cross-validation is performed on the class vector generated by each forest. If there is no obvious performance improvement after adding a certain number of cascading forest layers, the training process is terminated, thereby automatically determining the number of layers.

[0077] In one possible implementation, step S106 further includes: inputting the plurality of groups of conductor setting parameters and the plurality of groups of relative position parameters into the impact force analysis model to calculate a plurality of groups of instantaneous impact force data of the target conductor on the target railway shed when the target conductor is broken; obtaining first instantaneous impact force data and second instantaneous impact force data in the plurality of groups of instantaneous impact force data, the first instantaneous impact force data and the second instantaneous impact force data being any two different instantaneous impact force data in the plurality of groups 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, obtaining the target conductor setting parameter and the target relative position parameter input for calculating the first instantaneous impact force data; and taking the target conductor setting parameter and the target relative position parameter as the optimal setting parameter.

[0078] Specifically, by changing the initial impact force analysis parameters, impact force analysis operations under different analysis conditions are performed, and a plurality of different instantaneous impact force data are obtained. At this time, the values of the instantaneous impact force data are sorted in descending order, that is, the first instantaneous impact force data and the second instantaneous impact force data in the plurality of instantaneous impact force data are obtained, and it is determined 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 conductor setting parameters and the target relative position parameters input for calculating the smallest instantaneous impact force data are obtained; the target conductor setting parameters and the target relative position parameters are used as the optimal setting parameters.

[0079] By using the above method, the impact force analysis parameters are obtained when the impact force of the target railway shed tunnel is analyzed when the target conductor is broken. By the impact force analysis parameters, a plurality of first features affecting 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 plurality of first features. According to the first features and the weight parameters, a plurality of second features are constructed by a preset algorithm. The impact force analysis model is constructed according to the plurality of second features, and the instantaneous impact force data of the target railway shed tunnel when the target conductor is broken is calculated by the impact force analysis model. Thus, by combining multiple environmental factors to construct high-dimensional second features and constructing the impact force analysis model by the second features, the impact force analysis model is more accurate when calculating the instantaneous impact force data, thereby solving the problem of low calculation accuracy of the traditional model.

[0080] Please refer to Figure 5 which shows a module schematic diagram of a broken power transmission conductor impact force evaluation device provided by an embodiment of the present application. The device comprises an acquisition module 51 and a processing module 52, wherein,

[0081] The acquisition module 51 is configured to, in response to an impact force analysis operation of a target railway shed tunnel when a target conductor is broken, acquire impact force analysis parameters. The impact force analysis parameters include conductor setting parameters corresponding to the target conductor, shed structure parameters corresponding to the target railway shed tunnel, and relative position parameters. A plurality of first features affecting the impact force analysis calculation are obtained by the impact force analysis parameters.

[0082] The processing module 52 is configured to calculate a sensitivity index corresponding to each first feature, one first feature corresponding to one sensitivity index; configure different weight parameters for the plurality of first features according to the sensitivity index corresponding to each first feature, one first feature corresponding to one weight parameter; construct a plurality of second features according to the first features and the weight parameters, and through a preset algorithm, the dimension corresponding to the second features is greater than the dimension corresponding to the first features; construct an impact force analysis model according to the plurality of second features, and calculate the instantaneous impact force data of the target railway shed tunnel when the target conductor is broken through the impact force analysis model.

[0083] In a possible implementation, the acquisition module 51 is configured to, before acquiring the impact force analysis parameters in response to the impact force analysis operation of the target conductor on the target railway shed tunnel, the method further comprises: setting a preset working path, the preset working path comprising 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 the temporary data, the ANSYS software working path is used to call the ANSYS software to generate the corresponding parameterized design code, and the ANSYS / LS-DYNA software working path is used to call the LS-DYNA for further modeling and simulation.

[0084] In a possible implementation, the acquisition module 51 is configured to acquire the conductor setting parameters, the shed structure parameters and the relative position parameters in the impact force analysis parameters, specifically comprising: acquiring the number of sub-conductors parameter, the unit mass parameter of the conductor, the density parameter of the conductor, the elastic modulus parameter of the conductor, the Poisson's ratio parameter of the conductor, the diameter parameter of the conductor, the spacer configuration parameter, the insulator string configuration parameter, the conductor surface icing parameter and the wind deflection effect parameter as the conductor setting parameters; acquiring the foam concrete mechanical parameter, the shed column design parameter and the concrete thickness parameter as the shed structure parameters; and acquiring the intersection angle parameter and the distance parameter as the relative position parameters.

[0085] In a possible implementation, the processing module 52 is configured to calculate the sensitivity index corresponding to each first feature, specifically comprising: constructing a feature sample set of the plurality of first features; calculating the maximum impact force of the shed according to the feature sample set and through the simulation experiment; calculating the total variance and the expected conditional variance corresponding to the feature sample set according to the maximum impact force of the shed; and calculating the sensitivity index corresponding to each first feature according to the total variance and the expected conditional variance.

[0086] In a possible implementation, the processing module 52 is configured to calculate the sensitivity index corresponding to each first feature according to the total variance and the expected conditional variance, specifically comprising: calculating the sensitivity index corresponding to each first feature through the following formula:

[0087] ;

[0088] wherein, is the maximum impact force of the shed, is a set of feature samples of the first feature, represents a value of the th feature sample of the first feature, is the number of the first feature, is the sensitivity index corresponding to the th feature of the first feature, is the total variance, is the conditional expectation variance of the joint distribution corresponding to the th feature of the first feature.

[0089] In a possible implementation, the processing module 52 is configured to configure different weight parameters for the plurality of first features according to the sensitivity index corresponding to each first feature, specifically including: sorting the sensitivity index corresponding to each first feature in descending order of value; and configuring different weight parameters for the plurality of first features according to the sorting result.

[0090] In a possible implementation, the processing module 52 is configured to, after constructing the impact force analysis model according to the plurality of second features and calculating the instantaneous impact force data of the target conductor on the target railway shed when the target conductor is broken through the impact force analysis model, further configured to: input a plurality of groups of conductor setting parameters and a plurality of groups of relative position parameters into the impact force analysis model to calculate a plurality of groups of instantaneous impact force data of the target conductor on the target railway shed when the target conductor is broken; obtain first instantaneous impact force data and second instantaneous impact force data in the plurality of groups of instantaneous impact force data, the first instantaneous impact force data and the second instantaneous impact force data being any two different instantaneous impact force data in the plurality of groups 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, obtain the target conductor setting parameter and the target relative position parameter input for calculating the first instantaneous impact force data; and take the target conductor setting parameter and the target relative position parameter as the optimal setting parameter.

[0091] It should be noted that the apparatus provided in the above embodiments is only used as an example to illustrate the division of the above functional modules in realizing its functions, and in actual applications, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the above described functions. In addition, the apparatus and method embodiments provided in the above embodiments belong to the same concept, and the specific implementation process is described in detail in the method embodiments, which will not be repeated here.

[0092] The present application also provides an electronic device. Referring toFigure 6 , Figure 6 is a structural schematic diagram of an electronic device provided by an embodiment of the present application. The electronic device can 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.

[0093] The communication bus 602 is configured to realize connection and communication between the components.

[0094] The user interface 603 can include a display and a camera. Optionally, the user interface 603 can further include a standard wired interface and a wireless interface.

[0095] The network interface 604 can optionally include a standard wired interface and a wireless interface (such as a WI-FI interface).

[0096] The processor 601 can include one or more processing cores. The processor 601 is connected to various parts of the server through various interfaces and lines, and performs various functions and processes data of the server 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 of a hardware form of a digital signal processing (DSP), a field-programmable gate array (FPGA), and a programmable logic array (PLA). The processor 601 can be integrated with a combination of one or more of a central processing unit (CPU), a graphics processing unit (GPU), and a modem. The CPU is mainly used to process an operating system, a user interface, and an application program. The GPU is used to render and draw the content to be displayed on the display. The modem is used to process wireless communication. It can be understood that the above-mentioned modem can also not be integrated into the processor 601, but can be implemented by a separate chip.

[0097] The memory 605 can include a Random Access Memory (RAM) and can also include a Read-Only Memory (ROM). 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 can include a program storage area and a data storage area, where the program storage area can store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playing function, an image playing function, etc.), instructions for implementing the various method embodiments described above, etc.; and the data storage area can store data involved in the various method embodiments described above, etc. The memory 605 can also be at least one storage device located away from the aforementioned processor 601. Referring to Figure 6 The memory 605 as a computer storage medium can include an operating system, a network communication module, a user interface module, and the impact force evaluation application program of the fractured power transmission conductor on the railway shed tunnel.

[0098] In the electronic device shown in Figure 6 The user interface 603 is mainly used to provide an interface for user input and obtain user input data; and the processor 601 can be used to call the impact force evaluation application program of the fractured power transmission conductor on the railway shed tunnel stored in the memory 605, and when executed by one or more processors 601, the electronic device performs the method described in one or more of the above embodiments. It should be noted that, for the above-mentioned method embodiments, in order to simply describe, they are all expressed as a series of action combinations, but those skilled in the art should know that the application is not limited by the described action sequence, because according to the application, certain steps can be performed in other order or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification all belong to preferred embodiments, and the actions and modules involved are not necessarily required by the application.

[0099] The application also provides a computer-readable storage medium, which stores instructions. When executed by one or more processors, the electronic device performs the method described in one or more of the above embodiments.

[0100] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0101] In several embodiments provided in the present application, it should be understood that the disclosed apparatus can be implemented in other manners. For example, the division of the apparatus embodiments is merely illustrative, and the division of units can be changed according to actual conditions, such as a combination or integration of some units, or a deletion or addition of some features. In addition, the coupling or direct coupling or communication connection between the shown or discussed units can be indirect coupling or communication connection through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0102] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one place or distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0103] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0104] If the integrated unit is realized 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 solutions of the present application essentially or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product, which is stored in a memory and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the embodiments of the present application. The aforementioned memory includes: U disk, mobile hard disk, magnetic disk or optical disk, and various media that can store program codes.

[0105] The above is only an exemplary embodiment of the present application, and cannot limit the scope of the present application. Any equivalent changes and modifications made in accordance with the teachings of the present application are still within the scope of the present application. Those skilled in the art will easily think of other embodiments of the present application after considering the specification and the true disclosure.

[0106] The present application is intended to cover any variations, uses or adaptive changes of the present application, which follow the general principles of the present application and include common knowledge or conventional techniques in the technical field not disclosed in the present application.

Claims

1. A method for assessing the impact force of a broken power transmission line on a railway tunnel, characterized in that, The method includes: In response to the impact force analysis operation on the target railway tunnel when the target conductor breaks, impact force analysis parameters are obtained. These parameters include conductor setup parameters, tunnel structure parameters, and relative position parameters. Specifically, the conductor setup parameters, tunnel structure parameters, and relative position parameters are obtained as follows: conductor splitting quantity parameters, conductor unit mass parameters, conductor density parameters, conductor elastic modulus parameters, conductor Poisson's ratio parameters, conductor diameter parameters, spacer configuration parameters, insulator string configuration parameters, conductor surface icing parameters, and wind deflection effect parameters are obtained and used as the conductor setup parameters; foamed concrete mechanical parameters, tunnel support column design parameters, and concrete thickness parameters are obtained and used as the tunnel structure parameters; and crossing angle parameters and distance parameters are obtained and used as the relative position parameters. Using the impact force analysis parameters, several first features affecting the impact force analysis calculation are obtained; Calculate the sensitivity index corresponding to each of the first features, with one sensitivity index corresponding to each first feature; specifically, calculating the sensitivity index corresponding to each of the first features includes: constructing a feature sample set of multiple first features; calculating the maximum impact force of the tunnel through simulation experiments based on the feature sample set; calculating the total variance and expected conditional variance corresponding to the feature sample set based on the maximum impact force of the tunnel; calculating the sensitivity index corresponding to each of the first features based on the total variance and the expected conditional variance; specifically, calculating the sensitivity index corresponding to each of the first features based on the total variance and the expected conditional variance includes: calculating the sensitivity index corresponding to each of the first features using the following formula: ； in, The maximum impact force of the aforementioned shed. The set of feature samples for the first feature. This represents the functional relationship between the maximum impact force of the shed and the set of characteristic samples. Represents the first in the feature sample set The first characteristic, The number of the first feature, For the first The sensitivity index corresponding to each of the first features. To exclude the first The conditional expected variance of the joint distribution corresponding to each of the first features; the total variance corresponding to each feature sample set is calculated based on the maximum impact force of the tunnel. and calculation of division Other conditions are expected to be Then the expected conditional variance is ,in, Represents the first in the feature sample set The value of the first feature; Based on the sensitivity index corresponding to each first feature, different weight parameters are configured for multiple first features, with one weight parameter corresponding to one first feature. Based on the first feature and the weight parameters, multiple second features are constructed using a preset algorithm, wherein the dimension of the second feature is greater than the dimension of the first feature; An impact force analysis model is constructed based on multiple second features, and the instantaneous impact force data of the target conductor on the target railway tunnel when it breaks is calculated 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 tunnel when the target conductor breaks, the method further includes: A preset working path is set, which includes a simulation working path, an ANSYS software working path, and an ANSYS / LS-DYNA software working path. 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 the corresponding parametric design code. 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, The step of configuring different weight parameters for multiple first features based on the sensitivity index corresponding to each first feature specifically includes: The sensitivity indices corresponding to each of the first features are sorted in descending order of their values; Based on the sorting results, different weight parameters are configured for multiple first features.

4. The method according to claim 1, characterized in that, 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 tunnel at the time of fracture using the impact force analysis model, the method further includes: Using multiple sets of conductor setting parameters and multiple sets of relative position parameters as input, the impact force analysis model calculates multiple sets of instantaneous impact force data on the target railway tunnel when the target conductor breaks. Acquire first instantaneous impact force data and second instantaneous impact force data from multiple 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 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 the target conductor setting parameters and target relative position parameters used to calculate the first instantaneous impact force data are obtained; The target traverse setting parameters and the target relative position parameters are taken as the optimal setting parameters.

5. A device for assessing the impact force of a broken power transmission line on a railway tunnel, characterized in that, The device includes an acquisition module and a processing module, wherein, The acquisition module is used to respond to the impact force analysis operation on the target railway tunnel when the target conductor breaks, and to acquire impact force analysis parameters. These parameters include conductor setting parameters, tunnel structure parameters, and relative position parameters. Specifically, acquiring the conductor setting parameters, tunnel structure parameters, and relative position parameters includes: acquiring the conductor splitting quantity parameter, conductor unit mass parameter, conductor density parameter, conductor elastic modulus parameter, conductor Poisson's ratio parameter, conductor diameter parameter, spacer bar configuration parameter, insulator string configuration parameter, conductor surface icing parameter, and wind deflection effect parameter, and using these as the conductor setting parameters; acquiring the foamed concrete mechanical parameters, tunnel support column design parameters, and concrete thickness parameters, and using these as the tunnel structure parameters; acquiring the crossing angle parameter and distance parameter, and using these as the relative position parameters; and acquiring 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, where one first feature corresponds to one sensitivity index. Calculating the sensitivity index corresponding to each of the first features specifically includes: constructing a feature sample set of multiple first features; calculating the maximum impact force of the tunnel 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 tunnel; calculating the sensitivity index corresponding to each of the first features based on the total variance and the expected conditional variance; and calculating the sensitivity index corresponding to each of the first features based on the total variance and the expected conditional variance specifically includes: calculating the sensitivity index corresponding to each of the first features using the following formula: ； in, The maximum impact force of the aforementioned shed. The set of feature samples for the first feature. This represents the functional relationship between the maximum impact force of the shed and the set of characteristic samples. Represents the first in the feature sample set The first characteristic, The number of the first feature, For the first The sensitivity index corresponding to each of the first features. To exclude the first The conditional expected variance of the joint distribution corresponding to each of the first features; the total variance corresponding to each feature sample set is calculated based on the maximum impact force of the tunnel. and calculation of division Other conditions are expected to be Then the expected conditional variance is ,in, Represents the first in the feature sample set The values ​​of a first feature are determined; based on the sensitivity index corresponding to each first feature, different weight parameters are configured for multiple first features, with one first feature corresponding to one weight parameter; based on the first features and the weight parameters, multiple second features are constructed using a preset algorithm, where the dimension of the second features is greater than the dimension of the first features; an impact force analysis model is constructed based on the multiple second features, and the instantaneous impact force data of the target conductor on the target railway tunnel when it breaks is calculated using the impact force analysis model.

6. An electronic device, characterized in that, The device includes a processor, a communication bus, a user interface, a network interface, and a memory. The memory is used to store instructions. The user interface and the network interface are used to communicate with other devices. The processor is used to execute the instructions stored in the memory to cause the electronic device to perform the method as described in any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions that, when executed, perform the method as described in any one of claims 1 to 4.

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