Service performance evaluation method and system suitable for railway vehicle heterogeneous braking system

Abstract

The invention relates to a service performance evaluation method and system suitable for a railway vehicle heterogeneous braking system. According to the method, after operation state data of a railway vehicle is obtained, air pressure type characteristic parameters, speed type characteristic parameters and power consumption type characteristic parameters are extracted from the operation state data, and consistency calculation is carried out on the air pressure type characteristic parameters, the speed type characteristic parameters, the power consumption type characteristic parameters and historical characteristic parameters of corresponding types; an air pressure evaluation result, a speed evaluation result and a power consumption evaluation result are obtained, and brake system service performance classification evaluation is completed. And determining corresponding weights of the air pressure type evaluation result, the speed type evaluation result and the power consumption type evaluation result, and completing comprehensive evaluation of the service performance of the braking system. Compared with the prior art, the method has the advantages of comprehensively and accurately evaluating the service performance of the braking system in real time and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of rail vehicle safety assurance, and in particular to a service performance evaluation method and system suitable for rail vehicle heterogeneous braking systems. Background Art

[0002] The braking system is the core system to ensure the safe operation and reliable parking of rail vehicles. Its service performance directly affects the operation safety and efficiency of rail vehicles.

[0003] At present, the service performance evaluation of rail vehicle braking systems at home and abroad is mainly carried out through routine tests and type tests during the product stage and after the product is installed on the vehicle, in order to verify whether the design indicators of the braking system meet the requirements of standards or specifications, such as discrete and result-oriented indicators such as braking distance and average deceleration.

[0004] However, during the service process, the braking system is subject to the coupling of time-varying working conditions and multi-source excitation, which will inevitably lead to performance degradation or even functional failure. In addition, due to the many technical platforms of rail vehicle braking systems and the differences in the structures of braking systems of different models, the existing service performance evaluation methods for rail vehicle braking systems do not take the aforementioned influencing factors into consideration, making it difficult to conduct real-time, comprehensive and accurate evaluation of the service performance of the braking system. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a service performance evaluation method and system suitable for heterogeneous braking systems of rail vehicles. The method and system can evaluate the service performance of the braking system in real time, comprehensively and accurately based on the operating status data of the rail vehicle, provide a basis for the health management of the braking system, and further improve the intelligent operation and maintenance level of the braking system.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] According to a first aspect of the present invention, there is provided a service performance evaluation method suitable for heterogeneous braking systems of rail vehicles, comprising the following steps: S1, acquiring running status data of rail vehicles; S2, extracting air pressure characteristic parameters, speed characteristic parameters and power consumption characteristic parameters from the running status data, and respectively performing consistency calculations on the air pressure characteristic parameters, the speed characteristic parameters and the power consumption characteristic parameters with historical characteristic parameters of corresponding categories to obtain air pressure evaluation results, speed evaluation results and power consumption evaluation results, and complete classification evaluation of the service performance of the braking system; S3, determining corresponding weights of the air pressure evaluation results, the speed evaluation results and the power consumption evaluation results, and complete comprehensive evaluation of the service performance of the braking system.

[0008] As a preferred technical solution, S1 specifically includes: using preset feature extraction software to read the operating status data through a preset network, and the network is one of a CAN network, an MVB network and an Ethernet.

[0009] As a preferred technical solution, the operating status data includes rail vehicle speed, axle speed, braking command, total air pressure, air spring pressure and brake cylinder pressure.

[0010] As a preferred technical solution, S2 specifically includes: preprocessing the operating status data using preset feature extraction software, and performing braking process determination, feature parameter extraction and consistency calculation based on the preprocessed data.

[0011] As a preferred technical solution, the air pressure characteristic parameters include braking response time, brake cylinder steady-state pressure, fluctuation degree, maximum value, minimum value and delayed relief time; the speed characteristic parameters include braking distance, braking deceleration, braking impulse and maximum slip rate; the power consumption characteristic parameters include friction pair temperature rise, friction pair wear and braking energy.

[0012] As a preferred technical solution, the consistency calculation process specifically includes: normalizing the feature parameters, performing longitudinal comparative evaluation on the feature parameters, projecting the feature data to 0 to 100 according to the position of the feature parameters falling on the benchmark, determining the weights of different feature parameters, calculating the scores of each category, and using the scores as the evaluation results of the corresponding categories.

[0013] As a preferred technical solution, the process of comprehensive evaluation of the service performance of the braking system specifically includes: determining the weights of evaluation results of different categories using the entropy weight method or the coefficient of variation method; calculating the comprehensive score using the weighted summation method based on the evaluation results of different categories and the corresponding weights; and quantifying and scoring the service performance of the braking system based on the comprehensive score.

[0014] According to a second aspect of the present invention, there is provided a service performance evaluation system suitable for heterogeneous braking systems of rail vehicles, comprising an intelligent maintenance device and a mounting plate, wherein the intelligent maintenance device is fixedly connected to the rail vehicle via the mounting plate, the intelligent maintenance device comprises a shell, a power interface, and a network card, an industrial computer and a data sending module installed inside the shell, wherein the power interface is installed on the shell; the network card is used for network connection, the industrial computer is used for implementing the described method, the data sending module is used for connecting to the industrial computer and sending evaluation results, and the power interface is used for providing power for the evaluation system.

[0015] As a preferred technical solution, the shell is a groove-type structure.

[0016] As a preferred technical solution, the power interface provides 12-110V DC power to the evaluation system.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The brake system service performance evaluation method proposed in the present invention comprehensively considers multiple types of brake system characteristic parameters such as air pressure, speed, and power consumption, expands the performance evaluation range, makes the evaluation results more comprehensive, and completes the evaluation based on the consistency of the brake system characteristic parameters, thereby improving the evaluation accuracy. At the same time, the running status data of the rail vehicle is used as the evaluation basis. The status data can be real-time, and the real-time evaluation of the service performance of the brake system can be realized on the basis of the existing result evaluation, thereby completing the real-time, comprehensive and accurate evaluation of the service performance of the brake system;

[0019] 2. The service performance evaluation system proposed in the present invention adopts modular and integrated design, with compact structure, small size, and easy installation and maintenance;

[0020] 3. The service performance evaluation method and system proposed in the present invention utilize preset feature extraction software to perform processes such as data reading and preprocessing, braking process determination, feature parameter extraction, and consistency calculation. It can adapt to a spectrum of braking systems of different manufacturers, different structures, and different speed levels, and is applicable to all scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic flow chart of the method provided by the present invention;

[0022] Figure 2 A schematic diagram of evaluation indicators of various categories provided in the method in the embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the overall structure of an evaluation system provided in an embodiment of the present invention;

[0024] Among them: 1. Installation plate; 2. Shell; 3. Power interface; 4. Network card; 5. Industrial computer; 6. Data sending module. DETAILED DESCRIPTION

[0025] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0026] Example

[0027] like Figure 1 and Figure 2As shown, this embodiment first provides a service performance evaluation method suitable for a heterogeneous braking system of a rail vehicle, and the specific steps of the method are as follows:

[0028] Step S1, obtaining the running status data of the rail vehicle.

[0029] Specifically, the running status data of the rail vehicle is read through a preset network using a preset feature extraction software. The network is one of a CAN (Controller Area Network) network, an MVB (Multifunction Vehicle Bus) network and an Ethernet network. Exemplarily, the running status data includes rail vehicle speed, axle speed, brake command, total air pressure, air spring pressure and brake cylinder pressure.

[0030] Step S2, extracting air pressure characteristic parameters, speed characteristic parameters and power consumption characteristic parameters from the operating status data, and respectively performing consistency calculations on the air pressure characteristic parameters, speed characteristic parameters and power consumption characteristic parameters with the historical characteristic parameters of the corresponding categories, to obtain air pressure evaluation results, speed evaluation results and power consumption evaluation results, and complete the classification evaluation of the service performance of the braking system.

[0031] In this step, for example, the preset feature extraction software is used to extract the air pressure characteristic parameters, speed characteristic parameters and power consumption characteristic parameters of the rail vehicle operation status data, and the consistency calculation process is completed. The feature extraction software can adapt to the spectrum of braking systems of different manufacturers, different structures, different speed levels, etc., and has the functions of data filtering, data cleaning and other preprocessing, braking process determination, feature parameter extraction and consistency calculation. For example, the air pressure characteristic parameters include braking response time, brake cylinder steady-state pressure, fluctuation degree, maximum value, minimum value and delayed relief time, the speed characteristic parameters include braking distance, braking deceleration, braking impulse and maximum slip rate, and the power consumption characteristic parameters include friction pair temperature rise, friction pair wear and braking energy.

[0032] In this step, the characteristic parameters of air pressure, speed, and power consumption are used as evaluation indicators of the service performance of the brake system, and the consistency calculation is performed on the current characteristic parameters of air pressure, speed, and power consumption of the brake system with the historical characteristic parameters of the corresponding categories, so as to realize the classification evaluation of the service performance of the brake system. The consistency calculation means: by normalizing the characteristic parameters, the characteristic parameters are compared and evaluated longitudinally, the characteristic data are projected to 0 to 100 according to the position where the characteristic parameters fall on the benchmark, the weights of different characteristic parameters are determined, the scores of each category are calculated, and the scores are used as the evaluation results of the corresponding categories. Optionally, the weights of different characteristic parameters are determined by using methods such as entropy weight method and coefficient of variation method, and the scores of each category are calculated by weighted summation method, so as to realize the classification evaluation of the service performance of the brake system.

[0033] Step S3, determining the corresponding weights of the air pressure evaluation results, the speed evaluation results and the power consumption evaluation results, and completing the comprehensive evaluation of the service performance of the brake system.

[0034] In this step, the comprehensive evaluation process specifically includes: first, using the entropy weight method, the coefficient of variation method and other methods to determine the weights of the evaluation results of different categories obtained in step S2; then, according to the evaluation results of different categories and the corresponding weights, the weighted sum method is used to calculate the comprehensive score; finally, the service performance of the brake system is quantitatively scored according to the comprehensive score. For example, "100" indicates good performance, and "0" indicates complete failure.

[0035] Furthermore, this embodiment also provides a service performance evaluation system suitable for heterogeneous braking systems of rail vehicles, which can be used to implement the aforementioned evaluation method. Figure 3 An overall structure of the system is shown.

[0036] The evaluation system provided in this embodiment adopts a modular and integrated design, including an intelligent maintenance device and a mounting plate 1. The intelligent maintenance device is fixedly connected to the rail vehicle through the mounting plate 1. The intelligent maintenance device includes a shell 2, a power interface 3, and a network card 4, an industrial computer 5 and a data sending module 6 installed inside the shell 2. The power interface 3 is installed on the side wall of the shell 2; wherein the network card 4 adopts an MVB network card.

[0037] In this embodiment, the network card 4 is used for MVB network connection, the data sending module 6 is used to connect to the industrial computer 5 and send the brake system service performance classification and comprehensive evaluation results, and the power interface 3 is used to provide power for the evaluation system.

[0038] The industrial computer 5 is used to implement one or more steps of the aforementioned evaluation method. Specifically, the industrial computer 5 runs the embedded feature extraction software, and executes steps S1 to S2 through the feature extraction software, including reading the vehicle running status data such as rail vehicle speed, axle speed, brake command, total air pressure, air spring pressure, brake cylinder pressure, etc., as well as extracting and calculating the consistency of feature parameters such as air pressure, speed, and power consumption.

[0039] Optionally, the housing 2 is a groove-type structure to increase the heat dissipation capacity of the evaluation system during long-term operation.

[0040] Optionally, the evaluation system has passed routine and type tests such as high temperature test, low temperature test, alternating damp heat test, electromagnetic compatibility test, vibration and shock test, and meets the requirements for rail vehicle on-board equipment. After installation, the evaluation system only needs to be supplied with 12-110V DC power supply to work, that is, the power supply interface 3 provides 12-110V DC power supply for the evaluation system.

[0041] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A service performance evaluation method suitable for heterogeneous braking systems of rail vehicles, characterized in that: The following steps are involved: S1, obtaining the running status data of the rail vehicle; S2, extracting air pressure characteristic parameters, speed characteristic parameters and power consumption characteristic parameters from the running status data, and respectively calculating the consistency of the air pressure characteristic parameters, the speed characteristic parameters and the power consumption characteristic parameters with the historical characteristic parameters of the corresponding categories, obtaining air pressure evaluation results, speed evaluation results and power consumption evaluation results, and completing the classification evaluation of the service performance of the brake system; S3, determining corresponding weights of the air pressure evaluation results, the speed evaluation results and the power consumption evaluation results, and completing a comprehensive evaluation of the service performance of the braking system.

2. The service performance evaluation method suitable for heterogeneous braking systems of railway vehicles according to claim 1, characterized in that: The S1 specifically includes: using a preset feature extraction software to read the operating status data through a preset network, wherein the network is one of a CAN network, an MVB network and an Ethernet network.

3. The service performance evaluation method suitable for heterogeneous braking systems of railway vehicles according to claim 1, characterized in that: The operating status data includes rail vehicle speed, axle speed, brake command, total air pressure, air spring pressure and brake cylinder pressure.

4. The service performance evaluation method for heterogeneous braking systems of rail vehicles according to claim 1, characterized in that: The S2 specifically includes: preprocessing the operating status data using a preset feature extraction software, and performing braking process determination, feature parameter extraction, and consistency calculation based on the preprocessed data.

5. The service performance evaluation method suitable for heterogeneous braking systems of railway vehicles according to claim 1, characterized in that: The air pressure characteristic parameters include braking response time, brake cylinder steady-state pressure, fluctuation degree, maximum value, minimum value and delayed relief time; the speed characteristic parameters include braking distance, braking deceleration, braking impulse and maximum slip rate; the power consumption characteristic parameters include friction pair temperature rise, friction pair wear and braking energy.

6. The service performance evaluation method for heterogeneous braking systems of rail vehicles according to claim 1, characterized in that: The consistency calculation process specifically includes: normalizing the feature parameters, performing longitudinal comparative evaluation on the feature parameters, projecting the feature data to 0 to 100 according to where the feature parameters fall on the benchmark, determining the weights of different feature parameters, calculating the scores of each category, and using the scores as evaluation results of the corresponding categories.

7. The service performance evaluation method for heterogeneous braking systems of rail vehicles according to claim 6, characterized in that: The process of comprehensive evaluation of the service performance of the braking system specifically includes: Use the entropy weight method or the coefficient of variation method to determine the weights of different categories of evaluation results; According to the evaluation results of different categories and their corresponding weights, the comprehensive score is calculated using the weighted summation method; The service performance of the brake system is quantitatively scored based on the comprehensive score.

8. A service performance evaluation system suitable for heterogeneous braking systems of rail vehicles, characterized in that: It includes an intelligent maintenance device and a mounting plate, wherein the intelligent maintenance device is fixedly connected to the rail vehicle through the mounting plate, and the intelligent maintenance device includes a housing, a power interface, and a network card, an industrial computer and a data sending module installed inside the housing, and the power interface is installed on the housing; The network card is used for network connection, the industrial computer is used to implement the method according to any one of claims 1 to 7, the data sending module is used to connect to the industrial computer and send evaluation results, and the power interface is used to provide power for the evaluation system.

9. The service performance evaluation system suitable for heterogeneous braking systems of railway vehicles according to claim 8, characterized in that: The shell is a groove-type structure.

10. The service performance evaluation system suitable for heterogeneous braking systems of railway vehicles according to claim 8, characterized in that: The power interface provides 12-110V DC power to the evaluation system.

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