Vehicle health assessment method, electronic equipment and medium

Abstract

The invention provides a vehicle health assessment method, electronic equipment and a medium. The vehicle health assessment method comprises the following steps: dividing an assessed vehicle into a plurality of subsystems; obtaining evaluation index scores among the subsystems by adopting a digital scale construction method, and establishing an index matrix according to the evaluation index scores among the subsystems; performing consistency check on the index matrix to obtain weights of the subsystems; and calculating the health score of the evaluated vehicle according to the health score of the subsystem and the weight of the subsystem. According to the method, the vehicle is divided into the subsystems, the relation and the importance degree among the subsystems are considered, the weight of each subsystem influencing the health state of the whole vehicle is calculated, the comprehensive health score of the vehicle is calculated according to the health state and the weight of each subsystem, quantitative evaluation of the health state of the vehicle is achieved, the accuracy of vehicle health evaluation is improved, and the vehicle health evaluation efficiency is improved. The method provides a theoretical basis for stable operation and planned maintenance of the vehicle, and is of great significance for improving the safety and reliability of vehicle operation.

Description

Technical Field

[0001] The present invention belongs to the field of rail transit technology, and in particular relates to a vehicle health assessment method, electronic equipment and medium. Background Art

[0002] Railway locomotives are complex systems. Due to the large number of subsystems and components, the failures that occur during the operation of the locomotives also include various subsystems and subcomponents. How to evaluate the health of railway locomotives from the scattered failures of different subsystems and subcomponents is a complex issue.

[0003] At present, the health of railway locomotives and vehicles is generally judged according to the three dimensions of health, sub-health and failure. This method evaluates the health of sub-components and subsystems, and then simply judges the impact of subsystems on the overall health, and then evaluates the overall health of railway locomotives and vehicles. This method can only qualitatively distinguish the overall health of railway locomotives and vehicles, and it is difficult to accurately judge the health of locomotives and vehicles, which affects the stable operation and planned maintenance of locomotives and vehicles. Summary of the invention

[0004] The purpose of the present invention is to provide a vehicle health assessment method, electronic equipment and medium to improve the accuracy of vehicle health assessment in view of the deficiencies in the prior art.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A vehicle health assessment method includes the following process:

[0007] S1: Divide the evaluated vehicle into multiple subsystems;

[0008] S2: Use the digital scale construction method to obtain the evaluation index scores between subsystems, and establish the index matrix A according to the evaluation index scores between subsystems;

[0009]

[0010] S3: Normalize the indicator matrix to obtain the normalized indicator score. The expression of the normalized indicator score is as follows:

[0011]

[0012] Calculate the weight of the subsystem. The expression of the weight is as follows:

[0013]

[0014] S4: Check the consistency of the indicator matrix. If the indicator matrix does not meet the consistency requirements, repeat steps S2-S3 until the indicator matrix meets the consistency requirements.

[0015] S5: Divide the subsystem into multiple subcomponents, construct a subsystem health assessment score set based on the health status of the subcomponents, and take the average of the subsystem health assessment score set as the subsystem health score;

[0016] S6: Calculate the health score of the evaluated vehicle based on the health score of the subsystem and the weight of the subsystem. The expression of the health score S is as follows:

[0017]

[0018] Among them, aij is the evaluation index score between the ith subsystem and the jth subsystem, n is the number of subsystems, P ij is the normalized index score of aij, w i is the weight of the ith subsystem, s i Give the health score of the ith subsystem.

[0019] The present invention divides the vehicle into various subsystems, considers the relationship and importance of each subsystem, calculates the weight of each subsystem affecting the health status of the entire vehicle, and calculates the comprehensive health score of the vehicle based on the health status and weight of each subsystem, thereby achieving quantitative evaluation of the vehicle's health status and improving the accuracy of vehicle health evaluation, providing a theoretical basis for stable operation and planned maintenance of the vehicle, and is of great significance to improving the safety and reliability of vehicle operation.

[0020] Furthermore, when the evaluated vehicle is an AC drive electric locomotive, the subsystem includes a traction system, a bogie, a braking system, and a car body.

[0021] Furthermore, the subcomponents of the traction system include traction transformer, traction inverter, and traction motor; the subcomponents of the bogie include frame assembly, wheel axle drive device, suspension system, and traction device; the subcomponents of the braking system include wind source system, brake system, and basic braking device; the subcomponents of the car body include coupling buffer device, car body frame, and driver's cab.

[0022] Furthermore, the digital scale construction method includes 1-9 scale, 1-5 scale, 1-15 scale, x 2 Scale, Scale, 9 / 9-9 / 1 scale, 10 / 10-18-2 scale, index 9 k / 9 Scale.

[0023] Furthermore, the process of checking the consistency of the indicator matrix includes:

[0024] Calculate the maximum eigenvalue λ of the indicator matrix max :

[0025]

[0026] Calculate the consistency index CI:

[0027] Calculate the consistency ratio CR:

[0028] Among them, RI is the average random consistency index;

[0029] When the consistency ratio CR is less than the threshold, the indicator matrix is ​​judged to meet the consistency requirements.

[0030] Preferably, the threshold is 0.1.

[0031] Furthermore, in S5, the health status of the sub-components of the sub-system is evaluated based on the sensor data of the sub-system, and a health evaluation score set of the sub-system is constructed based on the health status of the sub-components.

[0032] Furthermore, a health assessment level of the assessed vehicle is determined based on the health score of the assessed vehicle; and operation suggestions and maintenance decisions are given based on the health assessment level of the assessed vehicle.

[0033] Furthermore, if 70 < the health score of the assessed vehicle ≤ 100, the health assessment level of the assessed vehicle is healthy, and the assessed vehicle functions normally and can normally complete the traction and transportation tasks, and perform daily maintenance on the vehicle;

[0034] 40<Health score of the assessed vehicle≤70, the assessed vehicle health assessment level is unhealthy, the assessed vehicle functions are basically normal, there are faults but they do not affect the main functions, the assessed vehicle can basically complete the traction and transportation tasks or complete the traction and transportation tasks with faults, and the key components of the vehicle are repaired;

[0035] 0<Health score of the assessed vehicle≤40, the health assessment level of the assessed vehicle is faulty, the main functions of the assessed vehicle fail, and it cannot complete the traction and transportation tasks, and the entire vehicle needs to be repaired.

[0036] Based on the same inventive concept, the present invention also provides an electronic device, including:

[0037] one or more processors;

[0038] A memory having one or more programs stored thereon, which, when executed by the one or more processors, enables the one or more processors to implement the steps of the vehicle health assessment method.

[0039] Based on the same inventive concept, the present invention also provides a computer-readable storage medium storing a computer program, which implements the steps of the vehicle health assessment method when executed by a processor.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] The present invention divides the vehicle into various subsystems, considers the relationship and importance of each subsystem, calculates the weight of each subsystem affecting the health status of the entire vehicle, and calculates the comprehensive health score of the vehicle based on the health status and weight of each subsystem, thereby achieving quantitative evaluation of the vehicle's health status, improving the accuracy of vehicle health evaluation, and providing a theoretical basis for stable operation and planned maintenance of the vehicle, which is of great significance to improving the safety and reliability of vehicle operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic diagram of a vehicle health assessment method according to the present invention;

[0043] Figure 2 This is a schematic diagram of the hierarchical analysis model of the AC drive electric locomotive. DETAILED DESCRIPTION

[0044] The present invention will be described in detail below in conjunction with the embodiments. It should be noted that the embodiments and features of the embodiments of the present invention can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0045] Example 1

[0046] like Figure 1 The vehicle health assessment method of this embodiment includes the following steps:

[0047] 1. Establish a hierarchical analysis model for rail vehicles

[0048] A hierarchical analysis model of AC transmission electric locomotive Figure 2 As shown, the model has the following characteristics:

[0049] a) The model level is generally greater than or equal to 2 layers.

[0050] b) The first layer can be the entire railway locomotive vehicle or a subsystem of the entire vehicle, depending on the object that needs to be health assessed.

[0051] c) The second layer is mainly an extension of the first layer.

[0052] d) It can be expanded to the third level and subsequent levels according to the needs of health assessment.

[0053] 2. Determine the weight of evaluation indicators

[0054] In the process of health assessment, the system hierarchical model is analyzed, the influence between factors in each layer and the connection between upper and lower layer factors are considered, corresponding values ​​are set for the importance of subsystems or subcomponents, and then the weight value of each indicator affecting the overall health status is calculated.

[0055] AC drive electric locomotive consists of four subsystems, namely traction system (A1), bogie (A2), braking system (A3) and car body (A4). By comparing the importance of each other between subsystems and using the digital scale construction method to score, the evaluation index scores between subsystems can be obtained.

[0056] The digital scale construction method is an existing technology, and the digital scale construction method includes 1-9 scale, 1-5 scale, 1-15 scale, x 2 Scale, Scale, 9 / 9-9 / 1 scale, 10 / 10-18-2 scale, index 9 k / 9 Scale, etc.

[0057] This embodiment uses a 1-9 scale to obtain the evaluation index scores between subsystems, as shown in Table 1.

[0058] Table 1 Evaluation index scores between subsystems of AC drive electric locomotive

[0059] A1 A2 A3 A4 A1 1 1 / 7 1 / 3 5 A2 7 1 3 9 A3 3 1 / 3 1 7 A4 1 / 5 1 / 9 1 / 7 1

[0060] According to the evaluation index scores between subsystems, the index matrix A is constructed as follows:

[0061]

[0062] According to formula (1), the normalized index score is calculated, and the index matrix is ​​normalized to obtain the normalized matrix P.

[0063]

[0064] Among them, aij is the evaluation index score between the ith subsystem and the jth subsystem, P ij is the normalized index score of aij.

[0065]

[0066] According to formula (2), the weight of the subsystem is calculated to obtain the weight vector w.

[0067]

[0068] Among them, wi is the weight of the ith subsystem.

[0069] w=(0.1203 0.5836 0.2549 0.0413)

[0070] The consistency check of indicator matrix A is carried out as follows:

[0071] Calculate the maximum eigenvalue λ of the indicator matrix max : Calculate the consistency index CI: Calculate the consistency ratio CR: Among them, RI is the average random consistency index, as shown in Table 2.

[0072] The calculation shows that CR=0.0799<0.1, so the indicator matrix passes the consistency check.

[0073] Table 2 Average random consistency index RI

[0074] Indicator matrix order 1 2 3 4 5 6 7 8 9 10 11 RI 0 0 0.58 0.9 1.12 1.24 1.32 1.41 1.45 1.49 1.51

[0075] The weights of the four subsystems of AC drive electric locomotive are shown in Table 3.

[0076] Table 3 Weights of four subsystems of AC drive electric locomotive

[0077] Subsystem Calculation weight (%) Traction system 12.03 Bogie 58.36 Braking system 25.49 Body 4.13

[0078] 3. Subsystem Health Score

[0079] The subsystem is divided into multiple subcomponents, and a subsystem health assessment score set is constructed according to the health status of the subcomponents. The average value of the subsystem health assessment score set is taken as the health score of the subsystem.

[0080] The subcomponents of the traction system include traction transformer, traction inverter, and traction motor; the subcomponents of the bogie include frame assembly, wheel axle drive device, suspension system, and traction device; the subcomponents of the braking system include wind source system, brake system, and basic braking device; the subcomponents of the car body include coupling and buffer device, car body frame, and driver's cab.

[0081] For example, the health status of the subcomponents of the traction system includes: the health status of the traction transformer, the health status of the traction converter, and the health status of the traction motor. These health statuses are determined by the performance indicators detected by the relevant sensors on the vehicle, including module temperature sensors, water pressure sensors, water temperature sensors, etc.

[0082] Taking the health status of the traction inverter as an example, the health assessment calculation of each sub-component is performed in real time according to the traction inverter sensor data. When each sensor completes the health assessment of the current component in the corresponding order, when no sensor reports a fault, the corresponding traction inverter health status is A, that is, healthy; when one or more sensors report a fault once or multiple times, it does not affect the overall operation of the traction inverter, and the corresponding traction inverter health status is B, that is, unhealthy; when one or more sensors report a fault once or multiple times, the traction inverter cannot operate, and the corresponding traction inverter health status is C, that is, faulty.

[0083] The judgment of the health status of the traction transformer and the traction motor is similar to that of the traction converter.

[0084] The health assessment score set of the traction system is jointly determined by the health status of the traction transformer, traction converter and traction motor. The evaluation relationship between the traction system health assessment score set and the traction transformer, traction converter and traction motor is as follows: when the health status of two or more sub-components in the traction system (traction transformer, traction converter and traction motor) is A, the health status of the traction system is A, that is, A+A+A=A, A+A+B=A, and the health assessment score set of the traction system is {80,90,100}; when the health status of two or more sub-components in the traction system is B, the health status of the traction system is B, that is, A+B+B=B, B+B+B=B, and the health assessment score set of the traction system is {50,60,70}; when the health status of one sub-component in the traction system is C, the health status of the traction system is C, and the health assessment score set of the traction system is {20,30,40}. The average value of the health assessment score set of the traction system is taken as the health score of the traction system.

[0085] 4. Vehicle Health Score

[0086] The health score of the evaluated vehicle is calculated based on the health scores of the subsystems and the weights of the subsystems.

[0087] Assuming that the health score of each subsystem is 90, the health score S of the AC drive electric locomotive is calculated according to formula (3).

[0088]

[0089] S=(12.03%×90+58.36%×90+25.49%×90+4.13%×90)=90

[0090] According to the health score of the vehicle, the health assessment level of the vehicle is determined, as shown in Table 4. Operational recommendations and maintenance decisions are given based on the health assessment level of the vehicle.

[0091] Table 4 Vehicle and subsystem health assessment level table

[0092]

[0093] The health score of the AC drive electric locomotive is 90; the health assessment level is healthy; the assessed vehicle functions normally and can complete traction and transportation tasks normally, and only daily maintenance is required for the vehicle.

[0094] Another embodiment of the present invention provides an electronic device, including:

[0095] one or more processors;

[0096] A memory having one or more programs stored thereon, which, when the one or more programs are executed by one or more processors, enables the one or more processors to implement the steps of the vehicle health assessment method.

[0097] In some implementations, the memory may be a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk memory.

[0098] In some other implementations, the processor may be a central processing unit (CPU), a digital signal processor (DSP), or other general-purpose processors of various types, which are not limited herein.

[0099] Another embodiment of the present invention provides a computer-readable storage medium storing a computer program, which implements the steps of the vehicle health assessment method when executed by a processor.

[0100] The vehicle health assessment method provided in this embodiment divides the structure of the whole vehicle system, considers the relationship and importance of each subsystem, calculates the weight of each subsystem affecting the health status of the whole vehicle, and calculates the comprehensive health score of the vehicle according to the health status and weight of each subsystem. It realizes quantitative assessment of the health status of the vehicle, improves the accuracy of vehicle health assessment, provides a theoretical basis for stable operation and planned maintenance of the vehicle, and is of great significance to improving the safety and reliability of vehicle operation.

[0101] This method avoids the subjectivity of the original locomotive and vehicle health assessment method of directly scoring the system, and reduces the subjective error of health assessment when the subsystem is unclear. After checking the consistency of the evaluation index scores between subsystems, the health scoring results of rail locomotives and vehicles are more reliable, accurate and reasonable.

[0102] This embodiment adopts the hierarchical analysis method to stratify rail vehicles, which is convenient for building a health management system for locomotives and vehicles and improving the health scoring system.

[0103] The contents explained in the above embodiments should be understood as these embodiments are only used to more clearly illustrate the present invention, and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

Claims

1. A vehicle health assessment method, characterized in that: The process includes: S1: Divide the evaluated vehicle into multiple subsystems; S2: Use the digital scale construction method to obtain the evaluation index scores between subsystems, and establish an index matrix based on the evaluation index scores between subsystems; S3: Normalize the indicator matrix to obtain the normalized indicator score. The expression of the normalized indicator score is as follows: Calculate the weight of the subsystem. The expression of the weight is as follows: S4: Check the consistency of the indicator matrix. If the indicator matrix does not meet the consistency requirements, repeat steps S2-S3 until the indicator matrix meets the consistency requirements. S5: Divide the subsystem into multiple subcomponents, construct a subsystem health assessment score set based on the health status of the subcomponents, and take the average of the subsystem health assessment score set as the health score of the subsystem. S6: Calculate the health score of the evaluated vehicle based on the health score of the subsystem and the weight of the subsystem. The expression of the health score S is as follows: Among them, aij is the evaluation index score between the ith subsystem and the jth subsystem, n is the number of subsystems, P ij is the normalized index score of aij, w i is the weight of the ith subsystem, s i Give the health score of the ith subsystem.

2. The vehicle health assessment method according to claim 1, characterized in that: When the evaluated vehicle is an AC drive electric locomotive, the subsystems include a traction system, a bogie, a braking system, and a car body.

3. The vehicle health assessment method according to claim 2, characterized in that: The subcomponents of the traction system include traction transformer, traction inverter, and traction motor; the subcomponents of the bogie include frame assembly, wheel axle drive device, suspension system, and traction device; the subcomponents of the braking system include wind source system, brake system, and basic braking device; the subcomponents of the car body include coupling and buffer device, car body frame, and driver's cab.

4. The vehicle health assessment method according to claim 1, characterized in that: The digital scale construction method includes 1-9 scale, 1-5 scale, 1-15 scale, x 2 Scale, Scale, 9 / 9-9 / 1 scale, 10 / 10-18-2 scale, index 9 k / 9 Scale.

5. The vehicle health assessment method according to claim 1, characterized in that: The process of checking the consistency of the indicator matrix includes: Calculate the maximum eigenvalue λ of the indicator matrix max : Calculate the consistency index CI: Calculate the consistency ratio CR: When CR is less than the threshold, the indicator matrix is ​​judged to meet the consistency requirements; Among them, RI is the average random consistency index.

6. The vehicle health assessment method according to claim 1, characterized in that: In S5, the health status of the sub-components of the sub-system is evaluated based on the sensor data of the sub-system, and a health evaluation score set of the sub-system is constructed based on the health status of the sub-components.

7. The vehicle health assessment method according to any one of claims 1 to 6, characterized in that: The health assessment level of the assessed vehicle is determined based on the health score of the assessed vehicle; operation suggestions and maintenance decisions are given based on the health assessment level of the assessed vehicle.

8. The vehicle health assessment method according to claim 7, characterized in that: 70<Health score of the assessed vehicle≤100, the assessed vehicle health assessment level is healthy, the assessed vehicle functions normally, can complete the traction and transportation tasks normally, and perform daily maintenance on the vehicle; 40<Health score of the assessed vehicle≤70, the assessed vehicle health assessment level is unhealthy, the assessed vehicle functions are basically normal, there are faults but they do not affect the main functions, the assessed vehicle can basically complete the traction and transportation tasks or complete the traction and transportation tasks with faults, and the key components of the vehicle are repaired; 0<Health score of the assessed vehicle≤40, the health assessment level of the assessed vehicle is faulty, the main functions of the assessed vehicle fail, and it cannot complete the traction and transportation tasks, and the entire vehicle needs to be repaired.

9. An electronic device, characterized in that: include: one or more processors; A memory having one or more programs stored thereon, which, when the one or more programs are executed by the one or more processors, enables the one or more processors to implement the steps of the method according to any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that: The computer program is stored therein, and when the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

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