Rail transit vehicle and vibration assessment method and system thereof

Abstract

The present invention discloses a rail transit vehicle and a vibration assessment method and system thereof. The present invention constructs the following vibration assessment model to calculate the vibration index of the rail vehicle as a whole; and utilizes the relationship between the vibration index R and the vibration threshold to evaluate the vibration performance of the whole vehicle. The present invention divides the vehicle into multiple regions: the vehicle body region, the vehicle body equipment region, the bogie frame region, and the axle region. A vibration assessment model is constructed based on the average acceleration of measurement points within each region. This model accurately reflects the actual vibration level of the vehicle, thereby facilitating adjustment of the vehicle's maximum speed based on the vibration index, resulting in optimal vehicle vibration performance and ensuring ride comfort and safety.

Description

Technical Field

[0001] The present invention relates to the field of rail transit technology, and in particular to a rail transit vehicle and a vibration evaluation method and system thereof. Background Art

[0002] With the rapid development of the rail vehicle industry, demands on rail vehicles are becoming increasingly stringent. Vehicle vibration is crucial to passenger comfort and safety. Therefore, effective methods must be employed to assess vehicle vibration during operation and thereby provide targeted vibration control.

[0003] Patent application CN111157201A discloses a method for constructing an accelerated super-Gaussian random vibration test profile. This method captures the vibration acceleration of a rolling stock during operation and, through data processing, ultimately derives the test acceleration of the equipment mounted on the vehicle undergoing random vibration on a vibration test bench. This method can simulate the super-Gaussian random vibration environment of a rolling stock and studies the random distribution of vibration energy. This method describes the probabilistic distribution of vibration energy and cannot assess vehicle vibration conditions. Existing vibration assessment methods for complete rail vehicles are currently unavailable. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a rail transit vehicle and a vibration assessment method and system thereof to effectively reflect the actual vibration level of the vehicle in view of the deficiencies in the existing technology.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: a rail transit vehicle vibration assessment method, comprising the following steps:

[0006] Construct the following vibration assessment models: Among them, R is the vibration index of the rail vehicle, K j is the regional coefficient, j is the regional number, AS j is the average root mean square value of acceleration of all measuring points in the jth region, STD j is the standard deviation of the average acceleration of the jth region measurement point, M j is the regional directional coherence coefficient;

[0007] The relationship between the vibration index R and the vibration threshold of the rail vehicle is used to evaluate the vibration performance of the vehicle.

[0008] The areas include the vehicle body area, the equipment area on the vehicle body, the bogie frame area and the axle area.

[0009] The present invention divides the vehicle into multiple areas, namely the vehicle body area, the equipment area on the vehicle body, the bogie frame area and the axle area. A vibration assessment model is constructed based on the average acceleration of the measuring points in each area. This model can accurately reflect the actual vibration level of the vehicle, thereby facilitating the adjustment of the vehicle's maximum speed according to the vibration index, resulting in better vehicle vibration performance and ensuring ride comfort and safety.

[0010] The average root mean square value of acceleration AS of all measuring points in the jth region j The calculation formula is:

[0011]

[0012] Among them, n2 is the number of measurement points in the jth area, A i is the RMS value of acceleration at the i-th measuring point, n1 is the measurement value f contained in the operating data measured at the i-th measurement point k or ASD k The number of ASD k is the acceleration spectrum density of the measurement data numbered k at the i-th measurement point, f k The frequency value of the data number k measured at the i-th measuring point.

[0013] The standard deviation of the average acceleration of the j-th region measurement point STD j The calculation formula is:

[0014]

[0015] In the present invention, the acceleration spectrum density bandwidth of the car body area and the equipment area on the car body is not less than 2Hz-150Hz, the acceleration spectrum density bandwidth of the bogie frame area is not less than 2Hz-250Hz, and the acceleration spectrum density bandwidth of the axle area is not less than 10Hz-500Hz.

[0016] In the present invention, the area coefficient K j The value range is 0 to 3.

[0017] In the present invention, the regional directional coherence coefficient M j The value range is 0 to 50.

[0018] Using the relationship between the rail vehicle vibration index R and the vibration threshold, the specific implementation process of evaluating the vibration performance of the entire vehicle includes:

[0019] If R<0, the vehicle vibration performance is unqualified;

[0020] If 0≤R≤0.5, the vehicle vibration performance is qualified;

[0021] If R>0.5, the vehicle vibration performance is excellent.

[0022] The method of the present invention further includes obtaining a vehicle operating speed V when R = 0, setting the operating speed V as the vehicle's maximum operating speed, and setting the vehicle operating speed to not exceed the maximum operating speed. The present invention can adjust the vehicle's maximum speed based on the vibration index, thereby optimizing vehicle vibration performance and ensuring ride comfort and safety.

[0023] In the present invention, in order to further accurately adjust the vehicle's maximum speed based on the vibration index and further improve ride comfort and safety, the vehicle's operating range can be divided into multiple subranges. Within each subrange, the vehicle's operating speed when R = 0 is set to the maximum operating speed of the vehicle in that subrange, and the vehicle's operating speed in that subrange is set to not exceed the maximum operating speed. As an inventive concept, the present invention also provides a rail transit vehicle vibration assessment system, which includes a processor and a memory; the memory stores a computer program / instructions; the processor executes the computer program / instructions stored in the memory; and the computer program / instructions are configured to implement the steps of the above-mentioned method of the present invention.

[0024] As an inventive concept, the present invention also provides a rail transit vehicle, which includes the above-mentioned evaluation system; the processor of the evaluation system communicates with the control system of the rail transit vehicle; or, the evaluation system and the control system of the rail transit vehicle are integrated into one.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1) The present invention divides rail vehicles into regions and establishes an overall evaluation model based on the vibration conditions in different regions, thereby improving the accuracy and reliability of vehicle vibration conditions during vehicle operation;

[0027] 2) The comprehensive vibration evaluation model in the present invention can effectively reflect the actual vibration level of the vehicle, guide the vehicle's operating speed under different operating environments, and limit the vehicle's maximum operating speed based on the comprehensive vibration evaluation values ​​of the vehicle at different speeds;

[0028] 3) The present invention's assessment of the vibration conditions of rail vehicles during operation can be used as an input basis for vibration tests of on-board equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a flow chart of a method according to an embodiment of the present invention;

[0030] Figure 2 Schematic diagram of vehicle area division according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are further described below with reference to the accompanying drawings.

[0032] like Figure 1 As shown, the vibration assessment method according to the embodiment of the present invention includes the following steps:

[0033] 1) Area division: Based on the connection relationship and relative position of various vehicle components, the rail vehicle is divided into different test areas;

[0034] In an embodiment of the present invention, a three-dimensional vibration sensor is installed in each area. The three-dimensional vibration sensor is attached to each area and collects vibration signals. Vibration acceleration can be converted into acceleration spectral density using methods such as Fourier transform.

[0035] In the embodiment of the present invention, the vehicle is divided into vehicle body areas ( Figure 2 A), equipment area on the vehicle body ( Figure 2 B), bogie frame area ( Figure 2 C in), axle area ( Figure 2 D); In the embodiment of the present invention, the basis for regional division is that the vibration acceleration in the same area is not much different and is within the same order of magnitude.

[0036] 2) Collect data under different working conditions and output the acceleration spectrum density (ASD) of the collection points (i.e., measurement points) in different areas;

[0037] In the embodiment of the present invention, the number and positions of the measuring points can be set according to actual use needs;

[0038] 3) Data processing: input the collected acceleration spectrum density of the acquisition point into the objective vibration evaluation model based on acceleration spectrum density, and output the average root mean square acceleration (AS) and acceleration deviation (STD);

[0039] The basic description of the objective vibration evaluation model of the embodiment of the present invention is as follows (j is the region number, i is the measurement point number, and k is the data number of a single measurement point):

[0040] The average root mean square value of acceleration AS of all measuring points in the jth region j The calculation formula is:

[0041]

[0042] Among them, n2 is the number of measurement points in the jth area, A i is the RMS value of acceleration at the i-th measuring point, n1 is the measured value (f k or ASD k , f k with ASD k is a one-to-one correspondence), ASD kis the acceleration spectrum density of the measurement data numbered k at the i-th measurement point, f k The frequency value of the data number k measured at the i-th measuring point.

[0043] The standard deviation of the average acceleration of the j-th region measurement point STD j The calculation formula is:

[0044]

[0045] The analysis bandwidth of acceleration spectrum density in different areas is: 2Hz-150Hz for the car body area and the equipment area on the car body, 2Hz-250Hz for the bogie frame area, and 10Hz-500Hz for the axle area.

[0046] 4) Result evaluation: AS and STD are output according to the objective vibration evaluation model, and the comprehensive vibration evaluation model based on the regional division strategy outputs the vehicle vibration index.

[0047] In the embodiment of the present invention, the calculation formula of the vehicle vibration index is as follows:

[0048]

[0049] In the above formula, R is the comprehensive evaluation index value of vehicle vibration. The larger R is, the better the vehicle vibration state is. The present invention can provide a simple evaluation standard: R < 0, the vehicle vibration performance is unqualified, 0 ≤ R ≤ 0.5, the vehicle vibration performance is qualified, and R > 0.5, the vehicle vibration performance is excellent. j∈{body area, body equipment area, bogie frame area, axle area}. K j is the regional coefficient, ranging from 0 to 3, M j is the regional directional coherence coefficient, ranging from 0 to 50.

[0050] In the embodiment of the present invention, the vibration conditions in the same area are similar and within the same order of magnitude;

[0051] The parameter selection takes into account factors such as fatigue and impact of vehicle manufacturing materials and vibration tolerance of on-board equipment;

[0052] The vibration condition of the entire vehicle is characterized by the vibration performance of the area with the largest vibration among the divided areas.

[0053] In some implementations, the running speed V of the vehicle when R=0 is obtained, and the running speed V is set as the maximum running speed of the vehicle, and the running speed of the vehicle is set to not exceed the maximum running speed.

[0054] In some implementations, in order to further accurately adjust the vehicle's maximum speed based on the vibration index and further improve ride comfort and safety, the vehicle's operating range can be divided into multiple sub-ranges. In each sub-range, the vehicle's operating speed when R=0 is set to the maximum operating speed of the vehicle in the sub-range, and the vehicle's operating speed in the sub-range is set to not exceed the maximum operating speed.

[0055] The comprehensive vibration evaluation model in this invention effectively reflects the vehicle's actual vibration level, guiding the vehicle's operating speed in different operating environments. Based on the comprehensive vibration evaluation values ​​at different speeds, the vehicle's maximum operating speed is limited. For example, if a vehicle runs at 70 km / h within a certain range, the R value is less than 0, while if it runs at 60 km / h, the R value is 0. Based on this result, the vehicle's maximum operating speed within this range cannot exceed 60 km / h.

[0056] Another embodiment of the present invention also provides a rail transit vehicle vibration assessment system, which includes a processor and a memory; the memory stores a computer program / instructions; the processor executes the computer program / instructions stored in the memory; the computer program / instructions are configured to implement the steps of the method of the above embodiment.

[0057] 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 storage.

[0058] In other implementations, the processor may be a central processing unit (CPU), a digital signal processor (DSP), an ARM or other general-purpose processor, which is not limited here.

[0059] The present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0060] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0061] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0062] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0063] Another embodiment of the present invention further provides a rail transit vehicle, comprising the evaluation system of the above embodiment.

[0064] The evaluation system of the above embodiment may be independent of the vehicle control system. In this case, the processor of the evaluation system communicates with the control system of the rail transit vehicle.

[0065] The evaluation system of the above embodiment may also be integrated with the control system of a rail transit vehicle.

Claims

1. A rail transit vehicle vibration assessment method, characterized in that: The following steps are involved: Construct the following vibration assessment models: Among them, R is the vibration index of the rail vehicle, K j is the regional coefficient, j is the regional number, AS j is the average root mean square value of acceleration of all measuring points in the jth region, STD j is the average acceleration standard deviation of the jth region measurement point, M j is the regional directional coherence coefficient; The relationship between the vibration index R of the rail vehicle and the vibration threshold is used to evaluate the vibration performance of the entire vehicle; wherein the areas include the vehicle body area, the equipment area on the vehicle body, the bogie frame area and the axle area.

2. The rail transit vehicle vibration assessment method according to claim 1, characterized in that: The average root mean square value of acceleration AS of all measuring points in the jth region j The calculation formula is: Among them, n2 is the number of measurement points in the jth area, A i is the RMS value of acceleration at the i-th measuring point, n1 is the measurement value f contained in the operating data measured at the i-th measurement point k or ASD k The number of ASD k is the acceleration spectrum density of the measurement data numbered k at the i-th measurement point, f k The frequency value of the data number k measured at the i-th measuring point.

3. The rail transit vehicle vibration assessment method according to claim 2, characterized in that: The standard deviation of the average acceleration of the j-th region measurement point STD j The calculation formula is:

4. The rail transit vehicle vibration assessment method according to claim 2, characterized in that: The acceleration spectrum density bandwidth of the car body area and the equipment area on the car body is 2Hz-150Hz, the acceleration spectrum density bandwidth of the bogie frame area is 2Hz-250Hz, and the acceleration spectrum density bandwidth of the axle area is 10Hz-500Hz.

5. The rail transit vehicle vibration assessment method according to claim 1, characterized in that: Regional coefficient K j The value range is 0 to 3.

6. The rail transit vehicle vibration assessment method according to claim 1, characterized in that: Regional directional coherence coefficient M j The value range is 0 to 50.

7. The rail transit vehicle vibration assessment method according to claim 1, characterized in that: Using the relationship between the rail vehicle vibration index R and the vibration threshold, the specific implementation process of evaluating the vibration performance of the entire vehicle includes: If R<0, the vehicle vibration performance is unqualified; If 0≤R≤0.5, the vehicle vibration performance is qualified; If R>0.5, the vehicle vibration performance is excellent.

8. The rail transit vehicle vibration assessment method according to any one of claims 1 to 7, characterized in that: Also includes: The running speed V of the vehicle when R=0 is obtained, and the running speed V is set as the maximum running speed of the vehicle, and the running speed of the vehicle is set to not exceed the maximum running speed.

9. The rail transit vehicle vibration assessment method according to claim 8, characterized in that: The vehicle operation interval is divided into a plurality of sub-intervals. In each sub-interval, the vehicle operation speed when R=0 is set as the maximum operation speed of the vehicle in the sub-interval, and the vehicle operation speed in the sub-interval is set not to exceed the maximum operation speed.

10. A rail transit vehicle vibration assessment system, characterized in that: The invention comprises a processor and a memory; the memory stores a computer program / instruction; the processor executes the computer program / instruction stored in the memory; the computer program / instruction is configured to implement the steps of the method according to any one of claims 1 to 9.

11. A rail transit vehicle, characterized in that: The evaluation system comprises the evaluation system according to claim 10; the processor of the evaluation system communicates with the control system of the rail transit vehicle; or the evaluation system is integrated with the control system of the rail transit vehicle.

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