114 results about "Subway line" patented technology

The invention discloses a subway passenger flow simulation deduction method considering an individual trip chain and an activity mode, and relates to the technical field of subway operation management, and the method comprises the following specific steps: constructing a topological framework, calculating an external factor attention weight, constructing an individual trip behavior library, carrying out dynamic topological adjustment, and executing passenger flow simulation and deduction. By constructing the space-time heterogeneous topology model and dynamically adjusting the weight values of the nodes and the edges, the precision and the real-time performance of subway passenger flow simulation are improved, physical parameters and historical operation data of urban subway lines are collected, an external factor input layer and a calibration layer are additionally arranged, and the accuracy of subway passenger flow simulation is improved. The spatial-temporal heterogeneous topology model can reflect the influence of external factors on the subway passenger flow in real time, the station retention weight and the line passing weight are dynamically corrected by calculating the attention weight of the external factors and combining data in the individual travel behavior library, and the prediction of the subway passenger flow change is realized. And a scientific basis is provided for subway operation managers.

The invention discloses a bolt color marking line detection method based on image segmentation and classification fusion, and belongs to the field of track maintenance. According to the method, a color mark line area of a bolt head is accurately segmented by collecting a track bolt image and combining image preprocessing and mask extraction. On the basis, through deep semantic feature extraction and fusion, pixel-level masks and global context information are integrated and sent to a classification network to judge whether the bolt color graticules are aligned or not. And finally, the whole network structure is optimized through a joint training mechanism, so that the accuracy and robustness of the system in a complex environment are improved. According to the method, the bolt color marking line can be accurately extracted under the complex conditions of weak light, light reflection, shielding and the like, the fine offset with the alignment deviation smaller than 15 degrees can be effectively recognized, and the method can be widely applied to the fields of subway lines, urban rail vehicle maintenance, automatic inspection robots and the like.

An analysis method for a metro line steel rail corrugation forming mechanism comprises the steps that numerical model input parameters are obtained, and a wheel-rail three-dimensional coupling numerical model suitable for a vehicle-rail / wheel set of a metro line is constructed; longitudinal and transverse half width lengths of wheel-rail contact spots in the stable running process of the vehicle / wheel are obtained so as to determine a creep force-creep rate relation curve; determining a creep rate saturation critical value to judge the creep saturation state of the wheel-rail system; a macroscopic determination program for determining the structural stability of the wheel-rail system; determining an analysis process of a steel rail corrugation forming mechanism; judging whether the contact interface creep is saturated or not, and analyzing the probability of occurrence of rail corrugation according to the judgment; and determining a wavelength fixing method for rail corrugation in an actual measurement interval, and verifying the effectiveness and applicability of the method. According to the method, the steel rail corrugation phenomenon on a subway line is focused, the analysis method is provided from the two aspects of microcosmic creep saturation and macroscopic structure stability, and therefore the occurrence probability of steel rail corrugation is reflected more accurately.

The invention discloses a subway line track state detection method and system based on an improved YOLOv8s algorithm, and relates to the technical field of image processing, and the method comprises the steps: obtaining a to-be-detected subway line track image, inputting the image to a feature extraction module, and obtaining a first extraction feature, a second extraction feature, a third extraction feature and a fourth extraction feature; inputting the fourth extraction feature into a double attention module to obtain an enhanced feature; inputting the enhanced features into an SPPF module to obtain initial fusion features; inputting the initial fusion feature into a true internal rolling module to obtain a deep fusion feature; inputting the first extraction feature, the second extraction feature, the third extraction feature and the deep fusion feature into a multi-scale fusion module to obtain a multi-scale feature; and inputting the multi-scale features to a detection head module to obtain a final detection result of the multi-scale detection target. And various types of defect targets existing on the track can be comprehensively, efficiently and accurately detected and identified.

The invention provides a dynamic decision-making method and system for store site selection based on geographic information, and relates to the technical field of geographic information system.The method comprises the steps that traffic data of main roads and subway lines of a target city and geographic image information of peripheral business districts of a to-be-analyzed area in the target city are obtained; processing the geographic image information to obtain a physical boundary range and business state distribution information of a peripheral business district, and calculating traffic reachability parameters in combination with traffic data; determining a preliminary candidate area in the physical boundary range, and obtaining a cooperative potential parameter according to the traffic reachability parameter; selecting a candidate store area position from the preliminary candidate area based on the traffic reachability parameter and the cooperative potential parameter; according to surrounding dynamic factors, the candidate store area positions are evaluated to determine the final store site selection, so that the accurate, intelligent and dynamic decision-making of the store site selection is realized, and the scientificity and the commercial success rate of the site selection are improved.

The invention relates to the technical field of deep foundation pit engineering construction, in particular to a first-supporting-and-second-supporting system construction method based on back pressure soil of a deep foundation pit of a temporary operating subway, and the method comprises the following steps: aiming at the construction problem of the deep foundation pit of the temporary operating subway, forming a collaborative supporting system by reserving a back pressure soil body, a supporting pile and a top beam; layered excavation is carried out by adopting a support-first and support-second process, and a next layer is excavated after support installation and prestress application are completed; deep foundation pit backfilling and steel support layered dismantling are executed step by step along with commercial main body structure construction; after the commercial main body reaches the preset stage, integrated construction including static cutting, rigid connecting component pre-embedding for settlement prevention and middle-embedded type water-stop belt waterproofing is conducted on the subway channel; and a real-time monitoring system is combined to ensure construction safety and subway structure stability. The method can effectively balance the stability of the deep foundation pit and metro protection requirements, improves the construction efficiency, solves the problems of settlement and leakage of construction joints, and is suitable for deep foundation pit engineering close to an operating metro.

The invention discloses a soft soil area newly-built box culvert short-distance crossing operation subway line construction method which comprises the steps that positioning paying-off and blocking are conducted in a construction area, and before a foundation pit is excavated, ballasting bags with the specific stacking weight and height are arranged in the center of a corresponding subway tunnel rail according to the linear meter; holes are formed in the uplift pile positioning positions on the two sides of the subway tunnel, a first section of pile casing is hoisted and pressed downwards till the first section of pile casing sinks, the perpendicularity is adjusted, a rotary drilling machine takes soil to enable the pile casing to sink, all sections of pile casings are sequentially inserted into the designated burial depth, a reinforcement cage is put down to pour concrete, the pile casings are pulled out after the strength reaches the standard, and a cushion layer is made; the uplift pile end reinforcing steel bars on the same side are connected through reinforcing steel bar nets to form an uplift beam net, box culvert bottom plate reinforcing steel bars are bound, and an uplift pile, uplift beam and box culvert bottom plate integrated structure is formed through formwork erecting and pouring. According to the technical scheme, disturbance of construction to the subway tunnel can be reduced, and operation safety is guaranteed.

This invention discloses a method for overlapping construction of waterproofing systems in existing subway lines. It relates to the field of underground engineering waterproofing construction technology and includes: Step 1, current status investigation and deformation assessment; Step 2, overlapping structure system design; Step 3, key material selection and process matching; Step 4, refined overlapping construction process; and Step 5, full inspection after each process. This invention's method for overlapping construction of waterproofing systems in existing subway lines, through Step 1, involves structural deformation monitoring and analysis and diagnosis of the existing waterproofing layer; Step 2, involves deformation adaptation structure design and differential deformation compensation design; Step 3, involves material selection and process innovation; Step 4, involves base treatment, interface treatment, expansion joint and node construction, and reinforcement layer construction; and Step 5, involves process inspection. This method, tailored to the characteristics of existing subway lines, enables the effective combination of different waterproofing materials, adapts to continuous deformation, and ensures long-term reliability.

The invention relates to the technical field of subway construction period emergency resource management, and particularly discloses a subway construction period emergency resource management and allocation method and system, and the method comprises the steps: building a line map of an existing subway line, carrying out the statistics of the resource types, number and coordinates of an emergency resource warehouse, building a resource map, setting the accident grade according to the accident type, and carrying out the emergency resource allocation. And determining the required resources under each grade, determining the required resources according to the accident type and grade when an emergency occurs, formulating an allocation scheme in combination with a resource map, and notifying management personnel of the emergency and the allocation scheme to realize rapid allocation of the resources. According to the invention, through presetting the emergency resource list and combining the real-time project progress, accurate matching is realized, emergency information is periodically updated to ensure accurate time efficiency, visual management is realized through a map, automatic monitoring and early warning linkage are realized to improve response sensitivity, so that emergency commanding and dispatching are more convenient, and emergency response efficiency is effectively improved.

The invention discloses a platform for spatial analysis of a protection area along a subway based on an unmanned aerial vehicle orthograph and a GIS map fusion technology, and belongs to the technical field of monitoring of the protection area along the subway, and the platform comprises a data collection module, a protection area image construction module, an abnormality judgment module, and a GIS real-time data sharing module. And the data acquisition module acquires video data of a target area through the unmanned aerial vehicle to obtain an orthograph of the target area, performs precision calibration on the obtained orthograph by using RTK to measure coordinates and elevation in combination with ground control points set in the target area, collects target subway line information, and marks a target subway line in the orthograph of the target area. According to the method, on the basis of the unmanned aerial vehicle orthograph and GIS map fusion technology, complex geographic information is simplified through linear processing on a subway protection area space analysis platform, the accuracy, real-time performance and efficiency of risk judgment are improved, and powerful support is provided for safety management of subway protection areas.

The invention discloses a safety assessment method and system based on construction along a subway, and belongs to the technical field of electric digital data processing, and the method comprises the following steps: obtaining an initial static comprehensive stress response value, and obtaining the initial construction speed of a grab machine through matching; a simulation construction comprehensive stress response value is obtained, and an initial construction speed simulation deviation proportion and a grab machine execution construction speed are obtained through analysis; whether construction speed correction processing is executed or not is judged, and if it is judged that the construction speed correction processing is executed, the construction speed correction processing is conducted; and if it is judged that the construction speed correction processing is not executed, a construction safety reminding signal is generated based on the construction execution speed of the grab machine and uploaded to a safety management background for construction safety reminding, and automatic construction state updating is carried out. The construction speed along the subway is reasonably adjusted, the construction safety is guaranteed, and the problem that in the prior art, the construction safety along the subway is poor due to the fact that the construction speed of a grab machine is unreasonable is solved.

The invention discloses a shield construction method and a heating device for underneath passing an existing operation subway line, and the method comprises the steps: obtaining a structure deformation cloud picture according to the position relation between a shield tunnel and an existing line and in combination with soil layer parameters; shield tunneling five-stage settlement control is carried out on the basis of the structural deformation cloud picture; wherein the shield tunneling five-stage settlement control comprises cutter head front settlement control, cutter head excavation position settlement control, shield tunneling machine right upper part settlement control, shield tail segment part settlement control and formed tunnel upper part lag settlement control. The problem that an existing construction method easily causes settlement or displacement overrun of an existing operation subway line can be effectively solved.

The invention provides a line inclined exchange station shield launching construction method, and relates to the technical field of subway line shield launching. According to the construction method, reinforcing steel bars are implanted into side walls, a bottom plate and a top plate in an original subway line, so that the structure of the reinforcing steel bars is perpendicular to a newly-built subway line, concrete is poured, and a tunnel portal structure is constructed; the original subway line is guaranteed to be perpendicular to the newly-built subway line through the tunnel portal, then when the shield tunneling machine conducts construction, the shield launching end wall is perpendicular to the line, a cutter head of the shield tunneling machine is made to be parallel to a tunnel face, it is guaranteed that stress is even when the shield tunneling machine conducts construction, the tunneling process is along the axis, precision is high, and deviation or rotation does not occur; the safety of the construction process is effectively improved, meanwhile, it is guaranteed that the shield tunneling machine cannot be damaged due to uneven stress, the construction progress is guaranteed, and the technical problems that an existing shield tunneling machine is uneven in stress and prone to deviation when starting on the oblique crossing line, the underground excavation construction period is long, and the cost is high are solved.

1. Name of the product in this design: Graphical User Interface for Displaying Subway Station Location Information on Electronic Devices. 2. Purpose of this design: To display the location of subway lines and stations. 3. The key design features of this product are its graphical user interface. 4. The image or photograph that best illustrates the design's key features: the front view. 5. Purpose of the graphical user interface: Used for human-computer interaction interfaces for subway lines and station locations. 6. Human-computer interaction method of graphical user interface: The main view is the start interface; click the icon of unchecking "map background" in the lower right corner of the main interface to enter the interface change state diagram 1. The interface change state diagram 1 is the map view by default, and a custom-drawn subway line map can be displayed on the tile map.

This application relates to the field of deep foundation pit construction technology, and particularly to a method for constructing deep foundation pits in a subway transfer node area. The transfer node area includes an enlarged section, a pipeline relocation section, and a main connecting section. A temporary partition is set on the side of the main connecting section to separate the transfer node area from the main section of the first subway line. The enlarged section adopts a concrete support system, while the pipeline relocation section and the main connecting section adopt a hybrid support system of concrete and steel supports. The deep foundation pit construction method includes: Step S1: Traffic diversion and pipeline relocation; Step S5: Foundation pit excavation and support: The foundation pit excavation and support adopts a combination of vertical layering and longitudinal segmentation. The longitudinal segmentation sequence is the enlarged section, the main connecting section, and the pipeline relocation section. When excavating and supporting the foundation pit of the pipeline relocation section, the temporary partition at the corresponding depth is removed simultaneously to avoid idle work and greatly shorten the overall construction time.

The present application relates to a kind of metro network level engineering vehicle protection system data acquisition method, equipment and medium, the method includes: signal interlocking system acquisition equipment information and send to ATS system, signal vehicle-mounted system sends train operation information to ATS system;ATS system sends equipment information and train operation information to network command center, while uploading the line number of this line;The interface server of network command center divides the received information to the processing thread of each line, and then the information output to network gate server by processing thread upload;Network gate server packs the information received to data pool and ferry to management network domain;Request information from network gate server, according to line, information is distinguished different thread processing, according to line, port number is sent to engineering vehicle interface front-end computer;Engineering vehicle interface front-end computer obtains information, and forwards information to engineering vehicle system.Compared with prior art, the present application has improved engineering vehicle operation efficiency and other advantages.

The invention provides a subway steel rail insulation degradation positioning method and device, computing equipment and a storage system.The subway steel rail insulation degradation positioning method comprises the steps that a simulation model is established based on a topological structure of a target subway line, and a training data set is established based on the established training data set; a first steel rail potential distribution model is generated, a first steel rail potential gradient characteristic quantity reflecting the insulation state is extracted, and an optimal steel rail insulation defect detection threshold value is determined through an optimization algorithm; on-site potential data is obtained, a second steel rail potential distribution model is constructed according to the on-site potential data, a second steel rail potential gradient characteristic quantity is extracted through multi-resolution spatial derivative analysis, the second steel rail potential gradient characteristic quantity is compared with the optimal detection threshold value, and a potential steel rail insulation defect section is identified; and performing time sequence frequency statistics on the position information of the potential steel rail insulation defect section, and determining the final high-confidence steel rail insulation degradation position. And automatic positioning and intelligent operation and maintenance of the insulation degradation area of the subway steel rail backflow type direct-current traction power supply system are realized.

A kind of soft soil layer deep foundation pit underground comprehensive pipe gallery supporting structure, including subway line area (1), it is characterized in that: one side of the subway line area (1) periphery is left piling area (2), the other side of subway line area (1) periphery is right piling area (3), located left concrete pile (4) and located right concrete pile (4) between along the spanning direction of underground comprehensive pipe gallery is erected with arc protective arch (6), two rows of support piles (13) are vertically fixed on arc protective arch (6) or cambered surface connecting component (8) and are arranged, located the same side support pile (13) between is provided with pipe gallery continuous wall (16) by concrete pouring, the present application has reasonable structure, arc protective arch is used as protective main structure, the load of structure, backfill soil and construction machine above subway line area is shared to the piling area outside bottom subway line area, the safety of subway line is guaranteed to the greatest extent.

This invention discloses a weak signal processing method for electromagnetic wave CT, solving the problem that electromagnetic wave attenuation leads to signal submersion in strong environmental noise when electromagnetic wave CT technology is used for long-span measurements or measurements in strata with high absorption coefficients. This enables the application of electromagnetic wave CT technology with borehole spacing exceeding 40m in strata with high absorption coefficients, reducing the number of boreholes along geological exploration routes by more than half, significantly reducing drilling costs and improving geological exploration efficiency. This invention has been tested in several confidential experiments on multiple subway lines, achieving good results. The application of this invention will have significant implications for improving the efficiency of urban underground space development and geological exploration in complex environments, as well as controlling construction costs.

The invention provides a double-layer vehicle base with double-line fusion operation and an access line arrangement structure. A first subway line comprises a first main line and a second main line, and a second subway line comprises a third main line and a fourth main line; one end of the first access line is connected with the first main line through the first turnout and connected with the second main line through the second turnout; one end of the second in-out line is connected with the second main line through a third turnout and connected with the first main line through a fourth turnout; one end of the third access line is connected with the third main line through a fifth turnout and connected with the fourth main line through a sixth turnout; one end of the fourth access line is connected with the third main line through a seventh turnout and is connected with the fourth main line through an eighth turnout; the other end of the first access line and the other end of the third access line are connected to a second-layer vehicle base and are connected through a first cross crossover in the second-layer vehicle base; the other end of the second access line and the other end of the fourth access line are connected to the first-layer vehicle base and are connected through a second cross crossover in the first-layer vehicle base.

This invention discloses a power utility tunnel spanning an operational subway line under conditions of ensuring smooth traffic flow and its construction method. The power utility tunnel includes: vertical shafts symmetrically arranged on both sides of a subway tunnel and an overpass box-shaped structure connecting the two vertical shafts; the overpass box-shaped structure spans across the subway tunnel and has a filling layer between it and the top slab of the subway tunnel; the overpass box-shaped structure is an integral reinforced concrete structure, with its two ends respectively connected to the vertical shafts on both sides; the cross-section of the overpass box-shaped structure is rectangular, and its width is greater than its height. In this invention, the overpass box-shaped structure is supported by the vertical shafts at both ends, relying on its own structural rigidity to resist possible uneven settlement, eliminating the need for temporary supports and foundation reinforcement above the subway tunnel, and reducing active disturbance to the subway structure from the source.

The invention provides an urban subway tunnel post-earthquake trapped person quantity analysis method and device, and relates to the technical field of civil engineering structure earthquake resistance. The method comprises the following steps: establishing an earthquake analysis model of a site where a city is located, and calculating an earthquake motion field distribution condition in a target earthquake scene; carrying out statistics on typical characteristics of the urban subway tunnel, constructing a tunnel-soil body fine standard model of each typical characteristic, and inputting seismic waves into the models to obtain a corresponding relation between a seismic motion field and a tunnel damage state; determining a ground motion field at the position of each subway tunnel, and calculating the probability of occurrence of different damage states of each subway tunnel according to the corresponding relation; and based on the urban subway line operation data and the passenger data, determining the personnel distribution condition of each subway tunnel at different time, and calculating the number of trapped people in the subway tunnel after the earthquake. According to the method, the evaluation result of the number of people trapped in the urban subway tunnel after the earthquake in different earthquake scenes can be realized, and a scientific and reasonable tool can be provided for pre-disaster defense and post-disaster emergency.

The invention discloses an intelligent command console adaptive adjustment system based on multi-source information fusion, which belongs to the technical field of rail transit dispatching command and comprises a rail transit data acquisition module, an external flow data acquisition module, a fuzzy association matching module and a large and small intersection adjustment control module. The rail transit data acquisition module is used for acquiring current rail transit subway data, including subway line station information, station travel interval, station driving time and large and small intersection station information, acquiring real-time subway pedestrian flow data and subway entering people number through a rail transit gate, and establishing a subway flow database; and the external flow acquisition module. According to the intelligent command console adaptive adjustment system based on multi-source information fusion, the configuration of large and small traffic vehicles is dynamically optimized by mining flow relevance data, and collaborative optimization of operation efficiency, service quality and cost control is realized.

The application discloses a metro line foreign matter intrusion identification method, which comprises the following steps: setting a trackside monitoring, positioning, calculating and communicating device along a metro track line, and setting an image detection device and a radar detection device on a metro car head for data collection; then, real-time visual field image in the collected data is identified and detected to obtain a visual field image feature detection result; real-time radar data is identified and monitored to obtain a current radar detection object position; according to a data synchronization frequency, the current radar detection object position after coordinate conversion and the visual field image feature detection result are fused in target position to obtain a vehicle-mounted intrusion detection result; the vehicle-mounted intrusion detection result is uploaded by using a metro vehicle-mounted communication device, combined with a trackside monitoring foreign matter intrusion result, and mapping alarm is performed on a metro track line simulation map.

The embodiment of the invention provides a train position safety detection method and device, electronic equipment and a medium, and the method comprises the steps: binding identifications of vehicle-mounted radars with train numbers and end sequences, and measuring the distance between two vehicle-mounted radars at the head and the tail of each train according to the installation positions of the vehicle-mounted radars at the two ends of each train; the method comprises the steps that a track electronic map is manufactured according to a subway line design drawing, any point of a line is selected as an original point according to the subway line design drawing, a two-dimensional coordinate system of the whole line is established, and coordinate points of the two-dimensional coordinate system correspond to the track electronic map; and according to the vehicle-mounted radar, the trackside radar and the distance between the two vehicle-mounted radars, the position of the train is determined based on the two-dimensional coordinate system and the track electronic map.

The application provides a kind of city subway water disaster anomaly positioning and display system of fusion multi-source data, with such characteristics, including data acquisition module;Data storage module;Factor analysis module is used to analyze the main factors of waterlogging;Water disaster prediction module is used to construct input data according to the data corresponding to each main factor of waterlogging in characteristic data, and input water disaster prediction model, obtain water disaster prediction place and corresponding prediction severity;Waterlogging prediction module is used to calculate each water disaster prediction place according to the corresponding characteristic data, obtain the waterlogging prediction range and the predicted water depth of each area of the water disaster prediction place as the waterlogging prediction result;Result positioning module is used to calculate each subway station affected by water disaster as disaster site according to waterlogging prediction result and subway line map data;Display module.In short, the method can accurately predict urban waterlogging and mark and display disaster-affected subway stations.

The application discloses a matching method and device of a multi-system access platform and electronic equipment, and relates to the technical field of subway communication, wherein the matching method comprises the following steps: determining at least one target scene where a target subway line is located, wherein each scene is configured with a multi-system access platform of one type, the multi-system access platform is used for outputting radio frequency signals of a passenger information private network and operator signals to a leaky cable distribution system after the radio frequency signals and the operator signals are combined, each type of multi-system access platform is integrated with signal access ports and combined transmission of multiple frequency bands, and the frequency bands at least include working frequency bands of the passenger information private network and operator communication frequency bands; and based on the target scene, a target multi-system access platform corresponding to the target scene is obtained by matching the multi-system access platforms of multiple types. The application solves the technical problem in the related art that a multi-system access platform cannot be flexibly adapted to and compatible with differentiated frequency bands of a subway passenger information private network and full frequency bands of an operator according to a scene.

The embodiment of the present application provides a kind of identification method, positioning method, device and equipment of network access equipment.Method includes: obtaining the positioning log and collection log of terminal equipment, network positioning data are included in positioning log;Satellite positioning data are included in collection log;Based on positioning log, obtain the subway line data of terminal equipment and the subway station corresponding to subway line data;According to subway line data, positioning log and collection log, determine the network access equipment deployed in subway station.The technical scheme provided in this embodiment, by obtaining positioning log and collection log, based on positioning log, obtain the subway line data of terminal equipment and the subway station corresponding to subway line data;According to subway line data, positioning log and collection log, determine the network access equipment deployed in the subway station, effectively realize the effective identification of network access equipment, so as to facilitate positioning operation based on network access equipment.

This invention provides a safety structure and construction method for a lightweight roadbed built above a subway line, comprising: an auxiliary component perpendicular to the ground, with its lower end extending below the bottom of the subway tunnel structure and equidistantly distributed on both sides of the subway tunnel; a protective component parallel to the ground, located above the lining structure of the subway tunnel; and a support component for connecting the protective component and the auxiliary component; the protective component is lower than the upper end of the auxiliary component. By employing the protective component, settlement of the subsequently built roadbed is avoided, and the load is transferred to the lower end and outer perimeter of the subway tunnel through the vertical and inclined concrete columns in the protective component, reducing the load above and ensuring the safety of the subway operation. Furthermore, the support and auxiliary components facilitate protection during roadbed construction, improving construction safety.

The invention discloses a construction method of a subway track irregularity spectrum, and aims to solve the technical problem that an existing classical track spectrum model is difficult to accurately and universally describe actual irregularity characteristics of subway lines in China. Comprising the following steps: a) acquiring actually measured track irregularity data of at least one subway line; b) based on the actually measured track irregularity data, calculating to obtain a power spectral density spectral line, the power spectral density spectral line representing a change relation of a power spectral density value along with a spatial frequency; c) preprocessing the power spectral density spectral line, wherein the preprocessing comprises identifying and eliminating periodic spectral peaks caused by track geometrical characteristics; d) the preprocessed power spectral density spectral line is converted to a logarithm-logarithm coordinate system, the abscissa is the logarithm value of the spatial frequency, and the ordinate is the logarithm value of the power spectral density value; and e) under the logarithm-logarithm coordinate system, establishing an analytical expression of the track irregularity power spectrum density through quintic polynomial fitting.