LTE transmission dynamics real-time simulation system based on LKJ data source

Abstract

The invention discloses an LTE transmission dynamics real-time simulation system based on an LKJ data source. The LTE transmission dynamics real-time simulation system based on the LKJ data source comprises an LKJ data acquisition system, an LKJ data processing system and an LKJ data processing system, wherein the LKJ data acquisition system is used for completing train operation state, driver operation information and line parameter acquisition; the LTE data transmission system is used for transmitting the data acquired by the LKJ device to the simulation platform; the simulation system is composed of a solver integration module and a three-dimensional visualization module and is used for carrying out simulation calculation on train operation scene visualization and train dynamics performance based on data transmitted by the LTE data transmission system, carrying out real-time evaluation and operation optimization on train longitudinal impulse characteristics and operation safety, and carrying out real-time control optimization on the train longitudinal impulse characteristics and the operation safety. And the evaluation and optimization results are transmitted to a train dispatching communication system for information sharing, so that LKJ data joint simulation calculation and visualization are realized, a real-time simulation system vividly and intuitively displays the dynamic operation behavior of the rolling stock on the line, the effective monitoring of the train driving safety and the sharing of the train operation state are realized, and the reliability of the system is improved. And long-term running safety monitoring requirements of the train are met.

Description

Technical Field

[0001] The present invention belongs to the technical field of rail transit, and particularly relates to a real-time simulation system for LTE transmission dynamics based on the data source of LKJ. Background Art

[0002] The Train Operation Monitoring Device (LKJ) is a train overspeed protection device independently developed in China and is an important part of the heavy-haul train operation control system in China. When the train is running, it can analyze and retrieve the basic line data stored in the on-vehicle host unit, and ensure the train operation safety by monitoring information such as the train running speed, signal equipment status, and driver operation conditions. It has the characteristics of high control accuracy, less interference to train operation, strong expansion ability, and can effectively respond to changes in line facilities and transportation conditions in a timely manner. In recent years, the functions of the LKJ device have been continuously upgraded and updated, and with the strengthening of information reception technology and transponder information reception technology, its scalability has been significantly improved. A wireless communication interface is also reserved in the device, laying a foundation for the transmission of various safety data.

[0003] However, the LKJ device can currently only display information such as the current train line condition and running situation in the form of graphics, curves, text, etc. through the screen display, or record information related to train operation safety for subsequent export and analysis. It is difficult to meet the monitoring and evaluation requirements for the dynamic characteristics such as running safety, smoothness, and longitudinal impulse during the actual train operation process. If traditional dynamic performance detection methods are used, sensors need to be installed on the test train to monitor indicators such as the vibration and displacement of key vehicle components. The detection process is costly, complex in operation, has a large amount of data collection and processing analysis tasks, requires technicians to have high professional qualities and rich practical experience, and can only obtain the dynamic performance indicators of the test train during the test period, and the test results have certain limitations.

[0004] Therefore, it is necessary to transmit the data collected by the LKJ device in real time for real-time analysis. LTE (Long Term Evolution) is an efficient wireless communication technology and is the standard of 4G wireless broadband technology. The LTE system introduces key transmission technologies such as OFDM (Orthogonal Frequency Division Multiplexing) and MIMO (Multi-input Multi-output), and can achieve high-speed and large-capacity data transmission. With the construction of the LTE wireless network along the railway, the on-vehicle LKJ device can realize the real-time collection and transmission of information such as the train operation status through the LTE network.

[0005] Since the data collected by the LKJ device is relatively comprehensive and no additional detection equipment needs to be set up, it can just solve the problem that the current dynamic simulation method simplifies the operation and running state of the train to reduce the installation and implementation difficulty. It comprehensively considers the complex running environment of the train and various influencing factors, and has the advantages of lower cost, higher efficiency and higher precision. Therefore, the LKJ technology is combined with LTE to establish a dynamic visualization real-time simulation system and method to meet the needs of long-term train operation safety monitoring and train safety operation and maintenance technology optimization. Summary of the Invention

[0006] To overcome the above deficiencies, a LTE transmission dynamics real-time simulation system based on LKJ data sources is proposed. It realizes the joint simulation calculation and visualization of LKJ data. The real-time simulation system can vividly and intuitively display the dynamic running behavior of locomotives and rolling stocks on the line, and the vibration forms of various components can be observed from different angles. The simulation interface can, according to the needs of users, display in real time information such as train running speed, locomotive and rolling stock ride quality indexes, locomotive and rolling stock safety indexes, and coupler force changes and upload them, realizing the effective monitoring of train operation safety and the sharing of train running state, and meeting the needs of long-term train operation safety monitoring.

[0007] The technical solution adopted by the present invention to achieve the above purpose is: to provide a LTE transmission dynamics real-time simulation system based on LKJ data sources. It includes: an LKJ data acquisition system: used to complete the acquisition of train running state information, driver operation information and line parameters; A LTE data transmission system: used to transmit the train running and operation data collected by the LKJ device to the simulation platform; A simulation system: composed of a solver integration module and a three-dimensional visualization module. The data transmitted by the LTE data transmission system is used as the input variable of the solver integration module. The core calculation program module in the solver integration module will perform real-time simulation calculations on the train dynamics performance. Subsequently, the simulation post-processing module will perform real-time evaluation and manipulation optimization on the train longitudinal impulse characteristics and running safety, and transmit the evaluation, optimization results and train visualization running scenarios to the train dispatching communication system through the network for information sharing, which is used for the monitoring, evaluation and recording of train operation safety, or transmit the optimized operation information to the train driver to assist in adjusting the train operation plan.

[0008] The real-time simulation system of LTE transmission dynamics based on the LKJ data source according to the present invention has a further preferred technical solution: the LKJ data acquisition system is composed of an LKJ host unit, a transponder information receiving unit, a locomotive signal unit, a man-machine interface unit, speed sensors and pressure sensors, and an LKJ extension unit, and is used to collect the train operation status, driver operation information and line parameters, and transmit the train operation and operation data to the LTE data transmission system through the extension unit to complete information interaction.

[0009] The real-time simulation system of LTE transmission dynamics based on the LKJ data source according to the present invention has a further preferred technical solution: The LKJ host unit is used to collect information from speed sensors, pressure sensors, transponder information receiving units, locomotive signal units and extension units, record and store the driver's traction and braking operation sequences and operation data in real time, and transmit the calculated speed limit curve and train operation status information to the man-machine interface unit, and complete device communication and data interaction through the extension unit; The transponder information receiving unit includes a BTM host and a BTM antenna, collects the current train operation line data, line speed limit and route information through the BTM antenna, and the BTM host interface is connected to the LKJ host unit to send the information to the LKJ host unit; The locomotive signal unit receives track circuit information through the locomotive signal receiving coil and the track circuit interface, and the locomotive signal host demodulates and processes the information and then transmits it to the LKJ host unit; The man-machine interface unit receives information from the LKJ host unit and the driver's operation, and displays line information, speed control curve, train operation information and auxiliary driving information through the data window, status window and middle screen window of the locomotive; The speed sensors and pressure sensors are respectively installed at the axle ends of the vehicle and the locomotive air pressure pipe, and are used to collect train operation speed, wheel angular speed, train pipe pressure, equalizing reservoir pressure and cylinder pressure information, and send them to the LKJ host unit; The LKJ extension unit is equipped with a WLAN wireless communication interface and a mobile communication interface, and connects the LTE transmitter to the mobile communication interface of the LKJ extension unit to realize the extended communication function between the LKJ host unit and the heavy-haul train dynamics visualization simulation platform.

[0010] For the real-time simulation system of LTE transmission dynamics based on the LKJ data source according to the present invention, a further preferred technical solution is as follows: The train operation state parameters include: train formation, the number of locomotives and wagons, train operation speed, and angular velocity of wheel set rotation; The driver's operation information includes: operation mode: traction, air braking, electric braking, electro-pneumatic combined braking, braking release, emergency braking; Magnitude of traction and braking load; Sizes of train pipe pressure, equalizing reservoir pressure, and cylinder pressure; The line parameters include curve radius, curve length, transition curve length, curve superelevation, line gradient, and ramp length.

[0011] For the real-time simulation system of LTE transmission dynamics based on the LKJ data source according to the present invention, a further preferred technical solution is as follows: The LTE data transmission system includes an LTE transmitter and an LTE receiver. The LTE transmitter is installed on the train and connected to the mobile communication interface of the LKJ extension unit for sending data; The LTE receiver is used to receive the received data, demodulate, decode, and restore it, and send the data to the heavy-haul train dynamics visualization simulation platform to complete data interaction with the simulation platform.

[0012] For the real-time simulation system of LTE transmission dynamics based on the LKJ data source according to the present invention, a further preferred technical solution is as follows: The solver integration module is composed of a simulation parameter setting module, a core calculation program module, a simulation post-processing module, and a simulation interface service module. By setting simulation parameters and inputting the information collected on-site, it calculates the state of the train dynamics system at continuous time steps within a specified time range, realizes the simulation calculation function of train dynamics performance, and transmits the calculation results to the 3D visualization module through an interface program.

[0013] For the real-time simulation system of LTE transmission dynamics based on the LKJ data source according to the present invention, a further preferred technical solution is as follows: The simulation parameter setting module is used for inputting the parameters for dynamic simulation calculation. It completes the parameter input by using the train formation plan, traction and braking operation sequence, and line condition parameters set by the user, or by using the train operation state parameters, driver operation information parameters, and line parameters transmitted by the LKJ-related devices and systems; The core calculation program module is mainly written in Fortran language, and the program content mainly includes the longitudinal dynamics model of the ten-thousand-ton heavy-haul train and the spatial dynamics model of the heavy-haul train - track interaction; The simulation post-processing module includes a train safety and stability evaluation model and a train operation optimization model. Based on the coupler force, wheel-rail vertical force, wheel-rail longitudinal and lateral creep forces, wheel-set lateral force, vibration accelerations of the car body, bogie, and axle box output by the core calculation program module, it calculates the safety and stability indicators, and simultaneously calculates and outputs the optimized train operation sequence; The simulation interface service module is used to implement the human-machine interaction function and the information interaction function between the solver integration module and the 3D visualization module. The human-machine interaction function includes the input and editing of dynamic simulation parameters, virtual scene preview, simulation result data export, and return to the initial interface function.

[0014] For the real-time simulation system of LTE transmission dynamics based on the LKJ data source according to the present invention, a further preferred technical solution is that the 3D visualization module is composed of a relational database, a 3D instance pool, a background service system, a file system, and a cache database, and its function is to display the dynamic running behavior of locomotives and rolling stocks on the line, as well as the longitudinal impulse characteristics of the train and the evaluation results of running safety.

[0015] For the real-time simulation system of LTE transmission dynamics based on the LKJ data source according to the present invention, a further preferred technical solution is that the relational database stores the horizontal and vertical section parameters of the railway line, the structure parameters of locomotives and freight cars, the characteristics parameters of couplers and buffers, and the train running resistance parameters; The 3D instance pool stores the 3D visualization models of the line, track, terrain, and locomotives and rolling stocks; The file system and the cache database are used to store the results of various simulation calculation tasks; The background service system is used to realize data transmission with the simulation interface service module, model calls of the relational database and the 3D instance pool, and store the simulation data in the file system and the cache database.

[0016] For the real-time simulation system of LTE transmission dynamics based on the LKJ data source according to the present invention, a further preferred technical solution is that the longitudinal impulse characteristics of the train include the coupler force of the train and the longitudinal vibration acceleration of the car body, and the evaluation results of the train running safety include the comprehensive evaluation index of the wheel-rail safety of heavy-haul trains including the vertical wheel-rail force, the lateral wheel-rail force, the lateral axle force, the derailment coefficient, and the wheel weight reduction rate index, as well as the comprehensive evaluation index of the stability of heavy-haul trains including the lateral / vertical ride quality index and the comfort index.

[0017] Compared with the prior art, the technical solution of the present invention has the following advantages / beneficial effects: 1. It realizes the combined simulation calculation and visualization of LKJ data. The real-time simulation system can vividly and intuitively display the dynamic running behavior of locomotives and rolling stocks on the line, and the vibration forms of each component can be observed from different angles. The simulation interface can, according to the needs of users, display in real time information such as the train running speed, the ride quality index of locomotives and rolling stocks, the safety index of locomotives and rolling stocks, and the change of coupler force and upload it, realizing the effective monitoring of train operation safety and the sharing of train operation status, and meeting the long-term operation safety monitoring needs of trains.

[0018] 2. The heavy-haul train dynamics simulation system established by the present invention uses simulation calculation and 3D visualization as technical means to solve the problem that it is impossible to analyze in real time the longitudinal impulse characteristics and operation safety of heavy-haul trains under different formations on different lines and operating conditions. The train operation information collected and calculated by the system can enable relevant technical personnel to quickly conduct analysis and research on specific on-site problems after being uploaded, modify the locomotive traction and braking operation sequences, realize the optimization of train operation, and assist in adjusting the train operation plan. In addition, according to the evaluation results automatically stored in the system, the train formation can be conveniently modified through the graphical interface, and the simulation analysis and evaluation can be carried out again, so as to help formulate more reasonable and effective operation strategies and formation plans, and provide scientific guidance for the optimization of heavy-haul train operation and formation. Brief Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is the overall architecture of the dynamics visualization real-time simulation system based on LKJ data transmission of the present invention. Detailed Embodiments

[0021] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention. Therefore, the detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention.

[0022] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it may not be further defined and explained in subsequent drawings.

[0023] Example 1: As Figure 1 shown, a LTE transmission dynamics real-time simulation system based on LKJ data source. It includes: LKJ data acquisition system: used to complete the acquisition of train operation status, driver operation information and line parameters (referring to parameters related to the line); LTE data transmission system: used to transmit the train operation and control data collected by the LKJ device to the simulation platform; Simulation system: composed of a solver integration module and a 3D visualization module. The data transmitted by the LTE data transmission system is used as the input variable of the solver integration module. The core calculation program module in the solver integration module will perform real-time simulation calculations on the train dynamics performance. Subsequently, the simulation post-processing module will perform real-time evaluation and manipulation optimization on the train longitudinal impulse characteristics and operation safety, and transmit the evaluation, optimization results and train visualization operation scenarios to the train dispatching communication system through the network for information sharing, which is used for the monitoring, evaluation and recording of train operation safety, or transmit the optimized manipulation information to the train driver to assist in adjusting the train operation plan.

[0024] The LKJ data acquisition system is composed of an LKJ host unit, a transponder information receiving unit, a locomotive signal unit, a man-machine interface unit, speed sensors and pressure sensors, and an LKJ extension unit, and is used to complete the acquisition of train operation status, driver manipulation information and line parameters, and complete information interaction through the extension unit.

[0025] The LKJ host unit is used to collect relevant information from speed sensors, pressure sensors, transponder information receiving units, locomotive signal units and extension units, record and store the driver's traction and braking operation sequences and operation data in real time, and transmit the calculated speed limit curve and train operation status information to the man-machine interface unit, and complete device communication and data interaction through the extension unit; The transponder information receiving unit includes a BTM host and a BTM antenna, collects the current train operation line data, line speed limit and route information through the BTM antenna, and the BTM host interface is connected to the LKJ host unit to send the information to the LKJ host unit; The locomotive signal unit receives the track circuit information through the locomotive signal receiving coil and the track circuit interface, and the locomotive signal host demodulates and processes the information and then transmits it to the LKJ host unit; The man-machine interface unit receives information from the LKJ host unit and the driver's operation, and displays the line information, speed control curve, train operation information and auxiliary driving information through the locomotive's data window, status window and screen middle window; The speed sensors and pressure sensors are respectively installed at the axle ends of the vehicle and the locomotive wind pressure pipe, and are used to collect train operation speed, wheel angular speed, train pipe pressure, equalizing reservoir pressure and cylinder pressure information, and send it to the LKJ host unit; The LKJ extension unit is equipped with a WLAN wireless communication interface and a mobile communication interface. Connect the LTE transmitter to the mobile communication interface of the LKJ extension unit to realize the extended communication function between the LKJ main unit and the heavy-haul train dynamics visualization simulation platform. The WLAN wireless communication interface is used for wireless communication and can also be used as a backup communication solution.

[0026] The train operation state parameters include: train formation, the number of locomotives and freight cars, train operation speed, and angular velocity of wheel rotation; the driver's operation information includes: operation mode: traction, air braking, electric braking, electro-pneumatic combined braking, braking release, emergency braking; traction and braking load magnitude; train pipe pressure, equalizing reservoir pressure, and brake cylinder pressure magnitude; the line parameters include curve radius, curve length, transition curve length, curve superelevation, line gradient, and ramp length.

[0027] The LTE data transmission system includes an LTE transmitter and an LTE receiver. The LTE transmitter is installed on the train and connected to the LKJ extension unit to send train data (current operation state parameters, driver operation information parameters, and line parameters); the LTE receiver is used to receive the data sent by the LTE transmitter, demodulate, decode, and restore the data, and send the train operation state parameters, driver operation information parameters, and line parameters to the heavy-haul train dynamics visualization simulation platform to complete data interaction with the simulation platform.

[0028] The solver integration module adopts the modular programming idea. Based on the vehicle-track coupling dynamics theory, it writes the dynamics model program and a large number of function interfaces and extended interface programs, which is conducive to realizing parallel computing and data interaction between different modules. By setting simulation parameters and inputting the information collected on-site, it calculates the state of the train dynamics system at continuous time steps within a specified time range, thereby realizing the dynamics simulation. The solver integration module consists of a simulation parameter setting module, a core calculation program module, a simulation post-processing module, and a simulation interface service module, which can realize the simulation calculation function of the train dynamics performance and transmit the calculation results to the 3D visualization module through the interface program.

[0029] The simulation parameter setting module is used for inputting the parameters for the dynamics simulation calculation. It completes the parameter input by using the train formation plan, traction and braking operation sequence, and line condition parameters set by the user, or by using the train operation state parameters, driver operation information parameters, and line parameters transmitted by the LKJ-related devices and systems. The core calculation program module is mainly written in Fortran language. The program content mainly includes the longitudinal dynamics model of the ten-thousand-ton heavy-haul train and the spatial dynamics model of the heavy-haul train-track interaction. The post-simulation processing module includes a train safety and stability evaluation model and a train operation optimization model. Based on the coupler force, wheel-rail vertical force, longitudinal and lateral creep forces between wheel and rail, lateral wheel-axle force, and vibration accelerations of the carbody, bogie, and axle box output by the core calculation program module, safety and stability indicators are calculated. Meanwhile, an optimized train operation sequence is calculated and output. The simulation interface service module is used to implement the human-computer interaction function and the information interaction function between the solver integration module and the 3D visualization module. The human-computer interaction function includes the input and editing of dynamic simulation parameters, virtual scene preview, export of simulation result data, and the function of returning to the initial interface.

[0030] The 3D visualization module is developed based on Unity3D, FairyGUI, and Photoshop software. The visualization interface is designed and produced through the interface design software Photoshop and the interface production software FairyGUI, and then published on the Unity3D software. The Unity3D software provides an environment to specifically implement each internal case of the module and packages it into an executable file. By introducing 3D modeling technology and visualization technology, a vehicle-track coupling dynamics 3D visual simulation system can be established to achieve joint simulation calculation and visualization. The 3D visualization module consists of a relational database, a 3D instance pool, a background service system, a file system, and a cache database. Its function is to display the dynamic running behavior of locomotives and rolling stocks on the line, as well as the longitudinal impulse characteristics of the train and the evaluation results of running safety.

[0031] The relational database stores the horizontal and vertical section parameters of the railway line, the structural parameters of locomotives and freight cars, the characteristics parameters of couplers and buffers, and the train operation resistance parameters. The 3D instance pool stores 3D visualization models of the line, track, terrain, and locomotives and rolling stocks. The file system and the cache database are used to store the results of various simulation calculation tasks. The background service system is used to realize data transmission with the simulation interface service module, model calls of the relational database and the 3D instance pool, and store the simulation data into the file system and the cache database.

[0032] The longitudinal impulse characteristics of the train include the coupler force of the train and the longitudinal vibration acceleration of the carbody. The evaluation results of the train running safety include the comprehensive evaluation index of the wheel-rail safety of the heavy-haul train, including the wheel-rail vertical force, wheel-rail lateral force, lateral wheel-axle force, derailment coefficient, and wheel load reduction rate index, as well as the comprehensive evaluation index of the stability of the heavy-haul train, including the lateral / vertical ride quality index and the comfort index. Example 2: S1. During the train operation, the on-vehicle LKJ-related devices and systems collect the train operation status, driver operation information, and line parameters in real time, including train formation, train operation speed, angular velocity of wheel rotation, train operation mode, traction and braking load, train pipe pressure, equalizing reservoir pressure, and pressure of the driving cylinder, curve radius, curve length, length of transition curve, curve superelevation, line gradient, and gradient length, and transmit them to the LKJ expansion unit.

[0033] S2. The LKJ expansion unit is connected to the LTE transmitter, which is connected to the intelligent gateway and transmits the data to the LTE receiver through the wireless network. After demodulating, decoding, and restoring the information, it completes data interaction with the simulation platform.

[0034] S3. The simulation platform completes the input of parameters based on the data transmitted by the LKJ-related devices and systems, and the core calculation program module starts to conduct dynamic simulation analysis of the heavy-haul train. The core calculation program module first uses the longitudinal dynamics model of the train to simulate and analyze the longitudinal impulse characteristics of the train operating under different formation types and different line conditions, solves the coupler forces at different positions of the heavy-haul train, and conducts statistical analysis on the coupler forces to obtain the position where the maximum coupler force appears in the train. Then, the vehicles at this position are set as the spatial dynamics model of the interaction between the heavy-haul train and the track to re-conduct dynamic calculations for calculating the vertical wheel-rail force, longitudinal and lateral creep forces between the wheel and the rail, lateral force of the axle box, and vibration accelerations of the car body, bogie, and axle box. The simulation post-processing module further solves to obtain the safety and stability indicators and the optimized train operation sequence.

[0035] S4. The simulation platform interface displays the three-dimensional visualization models of the heavy-haul train, line, track, and terrain, as well as the dynamic operation behavior of the locomotive and rolling stock on the line. The platform real-time displays the longitudinal impulse characteristics of the train and the simulation evaluation results of operation safety in a simple and easy-to-understand drawing form.

[0036] S5. To achieve the interconnection and interoperability between the dynamic simulation platform and various systems such as relevant on-vehicle data, safety equipment data, and wheel set dynamic monitoring systems, the dynamic simulation platform unifies the interface standard and reserves a data output interface to output a common data format. The simulation data and optimization results output by the simulation platform can be transmitted to the train dispatching communication system or other monitoring platforms to achieve information fusion and sharing.

[0037] S6. The train dispatching communication system transmits the operation optimization results to the locomotive through the LKJ expansion unit to assist in adjusting the train operation plan.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0039] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The above are only the preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as a limitation to the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. For those of ordinary skill in the art, without departing from the spirit and scope of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A real-time simulation system for LTE transmission dynamics based on the LKJ data source, characterized in that It includes: LKJ Data acquisition system: used to complete the acquisition of train operation status information, driver operation information, and line parameters; LTE data transmission system: used to transmit the train operation and operation data collected by the LKJ device to the simulation platform; Simulation system: composed of a solver integration module and a 3D visualization module. The data transmitted by the LTE data transmission system is used as the input variable of the solver integration module. The core calculation program module in the solver integration module will perform real-time simulation calculations on the train dynamics performance. Subsequently, the simulation post-processing module will perform real-time evaluation and operation optimization on the train longitudinal impulse characteristics and operation safety, and transmit the evaluation, optimization results, and train visual operation scenarios to the train dispatching communication system through the network for information sharing, for the monitoring, evaluation, and recording of train operation safety, or transmit the optimized operation information to the train driver to assist in adjusting the train operation plan.

2. The LTE transmission dynamics real-time simulation system based on the LKJ data source according to claim 1, wherein The LKJ data acquisition system is composed of an LKJ host unit, a transponder information receiving unit, a locomotive signal unit, a man-machine interface unit, speed sensors and pressure sensors, and an LKJ extension unit, and is used to complete the acquisition of train operation status, driver operation information, and line parameters, and transmit the train operation and operation data to the LTE data transmission system through the extension unit to complete information interaction.

3. The LTE transmission dynamics real-time simulation system based on the LKJ data source according to claim 2, characterized in that The LKJ host unit is used to collect information from speed sensors, pressure sensors, transponder information receiving units, locomotive signal units, and extension units, record and store the driver's traction and braking operation sequences and operation data in real time, and transmit the calculated speed limit curve and train operation status information to the man-machine interface unit, and complete device communication and data interaction through the extension unit; The transponder information receiving unit includes a BTM host and a BTM antenna, collects the current train operation line data, line speed limit, and route information through the BTM antenna, and the BTM host interface is connected to the LKJ host unit to send the information to the LKJ host unit; The locomotive signal unit receives the track circuit information through the locomotive signal receiving coil and the track circuit interface, and the locomotive signal host demodulates and processes the information and then transmits it to the LKJ host unit; The man-machine interface unit receives information from the LKJ host unit and driver operations, and displays line information, speed control curves, train operation information, and auxiliary driving information through the locomotive's data window, status window, and middle screen window; The speed sensors and pressure sensors are respectively installed at the axle ends of the vehicle and the locomotive air pressure pipe, and are used to collect train operation speed, wheel angular speed, train pipe pressure, equalizing reservoir pressure, and cylinder pressure information, and send it to the LKJ host unit; The LKJ extension unit is equipped with a WLAN wireless communication interface and a mobile communication interface, and connects the LTE transmitter to the mobile communication interface of the LKJ extension unit to realize the extended communication function between the LKJ host unit and the heavy-haul train dynamics visualization simulation platform.

4. The real-time simulation system for LTE transmission dynamics based on the LKJ data source according to claim 3, characterized in that The train operation state parameters include: train formation, the number of locomotives and freight cars, train operation speed, and angular velocity of wheel set rotation; the driver's operation information includes: operation modes: traction, air braking, electric braking, electro-pneumatic combined braking, brake release, emergency braking; magnitude of traction and braking load; magnitudes of train pipe pressure, equalizing reservoir pressure, and brake cylinder pressure; the line parameters include curve radius, curve length, transition curve length, curve superelevation, line gradient, and gradient length.

5. The real-time simulation system for LTE transmission dynamics based on the LKJ data source according to claim 1, characterized in that The LTE data transmission system includes an LTE transmitter and an LTE receiver. The LTE transmitter is installed on the train and connected to the mobile communication interface of the LKJ extension unit for sending data; the LTE receiver is used for receiving data, demodulating, decoding, and restoring it, and sending the data to the heavy-haul train dynamics visualization simulation platform to complete data interaction with the simulation platform.

6. The real-time simulation system for LTE transmission dynamics based on the LKJ data source according to claim 1, characterized in that, The solver integration module is composed of a simulation parameter setting module, a core calculation program module, a simulation post-processing module, and a simulation interface service module. By setting simulation parameters and inputting information collected on-site, it calculates the states of the train dynamics system at continuous time steps within a specified time range, realizes the simulation calculation function of train dynamics performance, and transmits the calculation results to the 3D visualization module through an interface program.

7. The real-time simulation system for LTE transmission dynamics based on the LKJ data source according to claim 6, characterized in that, The simulation parameter setting module is used for inputting parameters for dynamic simulation calculation. It completes parameter input using the train formation plan, traction and braking operation sequence, and line condition parameters set by the user, or using the train operation state parameters, driver operation information parameters, and line parameters transmitted by the LKJ-related devices and systems. The core calculation program module is mainly written in Fortran language, and the program content mainly includes the longitudinal dynamics model of the 10,000-ton heavy-haul train and the spatial dynamics model of the heavy-haul train - track interaction. The simulation post-processing module includes a train safety and stability evaluation model and a train operation optimization model. Based on the coupler force, wheel-rail vertical force, wheel-rail longitudinal and lateral creep forces, wheel set lateral force, and vibration accelerations of the car body, bogie, and axle box output by the core calculation program module, it calculates safety and stability indicators, and at the same time calculates and outputs the optimized train operation sequence. The simulation interface service module is used to realize the human-computer interaction function and the information interaction function between the solver integration module and the 3D visualization module. The human-computer interaction function includes input editing of dynamic simulation parameters, virtual scene preview, export of simulation result data, and function of returning to the initial interface.

8. The real-time simulation system for LTE transmission dynamics based on the LKJ data source according to claim 1, wherein The 3D visualization module is composed of a relational database, a 3D instance pool, a background service system, a file system, and a cache database. Its function is to display the dynamic operation behavior of locomotives and rolling stocks on the line, as well as the longitudinal impulse characteristics of the train and the evaluation results of operation safety.

9. The real-time simulation system for LTE transmission dynamics based on the LKJ data source according to claim 8, wherein The relational database stores the horizontal and vertical section parameters of the railway line, the structural parameters of locomotives and freight cars, the characteristics parameters of couplers and buffers, and the train operation resistance parameters. The 3D instance pool stores 3D visualization models of the line, track, terrain, and locomotives and rolling stocks. The file system and cache database are used to realize the storage of the results of various simulation calculation tasks. The background service system is used to realize data transmission with the simulation interface service module, model calls of the relational database and the 3D instance pool, and store the simulation data into the file system and the cache database.

10. The real-time simulation system for LTE transmission dynamics based on the LKJ data source according to claim 8, wherein, The longitudinal impulse characteristics of the train include the coupler force of the train and the longitudinal vibration acceleration of the car body. The evaluation results of the train operation safety include the comprehensive evaluation index of the wheel-rail safety of the heavy-haul train, including the vertical wheel-rail force, the lateral wheel-rail force, the lateral axle force, the derailment coefficient, and the wheel load reduction rate index, and the comprehensive evaluation index of the stability of the heavy-haul train, including the lateral / vertical ride index and the comfort index.

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