Locomotive cab vibration noise detection method, device and storage medium

Abstract

The application discloses a locomotive cab vibration noise detection method and device and a storage medium. The method comprises the following steps: collecting the inherent vibration frequency and the first noise value of the cab statically, processing the inherent vibration frequency data set and the first noise data set to obtain corresponding characteristic values; collecting the vibration response frequency and the second noise value of the cab dynamically, processing the vibration response data set and the second noise data set to obtain corresponding characteristic values; analyzing each noise characteristic value to determine the noise source; calculating the cavity inherent frequency; and determining the noise source. The application can detect the vibration noise source of the cab under different operating environments and in the full speed range, can more accurately and comprehensively detect the cab noise, and solves the problem that the measurement of the cab component noise of the locomotive at the maximum speed leads to inaccurate and incomplete measurement of the noise value.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of rail transit vehicle noise detection, and particularly relates to a locomotive cab vibration noise detection method, device and storage medium. BACKGROUND

[0002] With the progress of science and technology and the increasing environmental awareness of people, the comfort of the cab for the driver and attendant is put forward with higher requirements. As the workplace of the driver and attendant, the noise environment of the cab is directly related to the physical and mental health of the driver and attendant, work efficiency and user recognition of the locomotive. The noise level of the cab is an important indicator in the locomotive whole vehicle type test, and is a main technical parameter for judging whether the locomotive whole vehicle meets the design requirements and quality standards. The working environment of the cab is complex, and the cab noise can be divided into the following types according to the noise characteristics of the sound source: the aerodynamic noise generated by the disturbance of the gas, the structure noise generated by the vibration of the solid or fluid, the air transmission noise entering the cab through the wall of the cab, and the electromagnetic noise generated by the electromagnetic action. The locomotive speed is low, the on-board equipment is concentrated, and the structure bearing capacity is large, so the noise generated by the cab is mainly the structure noise generated by the structure vibration. The structure noise includes the noise generated by the deformation of the component affected by the external force or the relative motion between the components, and even the collision between the components. This structure noise may cause fluid-structure coupling vibration with the cavity in the cab, forming resonance noise.

[0003] At present, in the locomotive type test, the maximum noise value of the cab is usually measured and judged according to GB / T 3450 "Railway Locomotive and Motor Train Unit Cab Noise Limit and Measurement Method". When detecting the noise of the cab of the locomotive, the noise value measured at the maximum speed of the locomotive is taken as the maximum noise value of the cab. However, when the locomotive is not running at the maximum speed, the noise value measured when the vibration of the structure or component of the cab produces resonance or resonance may be greater than the noise value measured at the maximum speed of the locomotive. In this case, the noise value measured at the maximum speed is not accurate as the maximum noise value of the cab. SUMMARY

[0004] The present application aims to provide a locomotive cab vibration noise detection method, device and storage medium to solve the problem that the noise generated by the vibration of the components of the cab of the locomotive cannot be accurately detected when the locomotive is not running at the maximum speed.

[0005] The present application solves the above technical problems by the following technical scheme: a locomotive cab vibration noise detection method, comprising the following steps:

[0006] The inherent vibration frequency data set is obtained by acquiring the inherent vibration frequency of the driver's room structure and the vibration source equipment collected statically, and the inherent vibration frequency characteristic value is obtained by processing the inherent vibration frequency data set;

[0007] The first noise data set is obtained by acquiring the first noise value of the vibration source equipment in the driver's room collected statically, and the first noise characteristic value is obtained by processing the first noise data set;

[0008] The vibration response frequency data set is obtained by acquiring the vibration response frequency of the driver's room structure and the vibration source equipment collected under different operating environments and different operating speeds, and the vibration response frequency characteristic value is obtained by processing the vibration response frequency data set;

[0009] The second noise data set is obtained by acquiring the second noise value of the vibration source equipment in the driver's room collected under different operating environments and different operating speeds, and the second noise characteristic value is obtained by processing the second noise data set;

[0010] The cavity inherent frequency of the driver's room is calculated;

[0011] The noise source is determined according to the inherent vibration frequency characteristic value, the first noise characteristic value, the second noise characteristic value, the vibration response frequency characteristic value, and the cavity inherent frequency.

[0012] Further, the inherent vibration frequency at least includes the inherent vibration frequency of the driver's room related structure before assembly, the inherent vibration frequency of the related vibration source equipment before assembly, and the inherent vibration frequency of the driver's room related structure or the vibration source equipment arranged on the related structure after assembly;

[0013] The first noise value at least includes the noise generated by the driver's room related vibration source equipment after assembly;

[0014] Wherein, related refers to possibly related to the noise source.

[0015] Further, the vibration response frequency at least includes the vibration response frequency of the driver's room related structure, and the vibration response frequency of the related vibration source equipment;

[0016] The second noise value at least includes the noise generated by the driver's room related vibration source equipment.

[0017] Further, the formula for calculating the cavity inherent frequency is:

[0018]

[0019] Wherein, f0 is the cavity inherent frequency, c is the sound speed, L is the longitudinal length of the driver's room cavity, W is the transverse width of the driver's room cavity, and H is the vertical height of the driver's room cavity.

[0020] Further, the specific implementation process of determining the noise source is as follows:

[0021] When | the first noise characteristic value-the second noise characteristic value | is less than or equal to a set threshold value, the noise source corresponding to the first noise characteristic value is the noise source;

[0022] When | the second noise characteristic value-the vibration response frequency characteristic value or the integer multiple of the vibration response frequency characteristic value | is less than or equal to a set threshold value, and | the vibration response frequency characteristic value-the cavity natural frequency or the integer multiple of the cavity natural frequency | is less than or equal to a set threshold value, the noise source is the cavity resonance;

[0023] When | the second noise characteristic value-the vibration response frequency characteristic value or the integer multiple of the vibration response frequency characteristic value | is less than or equal to a set threshold value, and | the vibration response frequency characteristic value-the natural vibration frequency characteristic value or the integer multiple of the natural vibration frequency characteristic value | is less than or equal to a set threshold value, the noise source corresponding to the natural vibration frequency characteristic value is the noise source;

[0024] When | the second noise characteristic value-the vibration response frequency characteristic value or the integer multiple of the vibration response frequency characteristic value | is less than or equal to a set threshold value, and | the vibration response frequency characteristic value-the cavity natural frequency or the integer multiple of the cavity natural frequency | is less than or equal to a set threshold value or | the vibration response frequency characteristic value-the natural vibration frequency characteristic value or the integer multiple of the natural vibration frequency characteristic value | is less than or equal to a set threshold value, the noise source includes the cavity resonance or the structure radiation noise caused by the resonance.

[0025] Preferably, the set threshold value is 5 Hz.

[0026] Based on the same inventive concept, the present application also provides a locomotive cab vibration noise detection device, comprising a memory and a processor, the memory stores a computer program capable of running on the processor, and the processor executes the steps of the locomotive cab vibration noise detection method as described above when running the computer program.

[0027] Based on the same inventive concept, the present application also provides a computer readable storage medium, which is a non-volatile storage medium or a non-transient storage medium, and stores a computer program thereon, and the computer program executes the steps of the locomotive cab vibration noise detection method as described above when running by a processor.

[0028] Advantages

[0029] Compared with the prior art, the present application has the following advantages:

[0030] The locomotive cab vibration noise detection method, device and storage medium provided by the application can detect the vibration noise source of the cab of the locomotive under different operating environments and the full speed range, can more accurately and comprehensively detect the cab noise, and solves the problem of inaccurate and incomplete measurement of the cab component noise of the locomotive at the maximum speed.

[0031] The application can more accurately predict the maximum cab noise according to the inherent vibration frequency of the cab structure and the vibration source equipment, and provides a basis for preventing the cab noise from exceeding the standard. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the application, the drawings needed in the following embodiment description will be briefly introduced. Obviously, the drawings in the following description are only one embodiment of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0033] Figure 1 is a locomotive cab vibration noise detection method flowchart in the embodiment of the application;

[0034] Figure 2 is a schematic diagram of the structure of the cab in the embodiment of the application, wherein figure (a) is a front view of the cab, figure (b) is a right side view (remove the rear wall), figure (c) is a top view (remove the top cover), and figure (d) is an A-A sectional view of figure (a);

[0035] Figure 3 is a schematic diagram of the vibration source equipment arrangement of the cab in the embodiment of the application, wherein figure (a) is a front wall of the cab, figure (b) is a rear wall of the cab, and figure (c) is a top view of the cab;

[0036] Figure 4 is a schematic diagram of the installation position of the frequency collection device and the noise collection device in the embodiment of the application, wherein figure (a) is a side wall of the cab, figure (b) is a front wall of the cab, figure (c) is a B-B sectional view of figure (a), figure (d) is an A-A sectional view of figure (a), and figure (e) is a C-C sectional view of figure (a);

[0037] Figure 5 is a structure diagram for determining the main source of noise in the embodiment of the application.

[0038] Among them, 1-driver's cab, 11-left side wall, 12-right side wall, 13-front wall, 14-floor, 15-rear wall, 16-top cover, 21-top placement point, 22-front wall placement point, 23-control panel placement point, 24-left side wall placement point, 25-seat placement point, 26-right side wall placement point, 27-rear wall placement point, 31-frequency acquisition device installed on the top cover of the driver's cab, and 41-noise acquisition device installed in the center of the driver's cab. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] The technical solutions of this application will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0041] like Figure 1 As shown in the figure, the locomotive driver's cab vibration and noise detection method provided in this embodiment includes the following steps:

[0042] Step 1: Static acquisition of the natural vibration frequency and first noise value of the driver's cab.

[0043] like Figure 2 As shown, the driver's cab 1 includes, but is not limited to, the left side wall 11, the right side wall 12, the front wall 13, the rear wall 15, the roof 16, and the floor 14. When in the driver's seat, the front wall is 13, the rear wall is 15, the left side is 11, and the right side is 12.

[0044] like Figure 3 As shown, the vibration source equipment in the driver's cab is arranged at the top (point 21), front wall (point 22), control panel (point 23), left side wall (point 24), seat (point 25), right side wall (point 26), and rear wall (point 27). The vibration source equipment includes, but is not limited to, various ventilation and heating equipment (such as fans, air conditioners, and heaters), audible alarm devices (such as bag horns), vibration devices (such as various motor-driven devices), and various electric or pneumatic devices such as windshield wipers.

[0045] According to the driver's room vibration noise detection requirements, the frequency acquisition device is used to collect the inherent vibration frequency of the driver's room statically, and the noise acquisition device is used to collect the first noise value of the driver's room statically. In this embodiment, the inherent vibration frequency at least includes the inherent vibration frequency of the driver's room related structure before assembly, the inherent vibration frequency of the related vibration source equipment before assembly, and the inherent vibration frequency of the driver's room related structure or the vibration source equipment arranged on the related structure after assembly; the first noise value at least includes the noise generated by the driver's room related vibration source equipment after assembly; wherein the related refers to the possible vibration noise source.

[0046] For example, if it is necessary to detect the vibration noise of the top of the driver's room, the inherent vibration frequency at least includes the inherent vibration frequency of the top cover of the driver's room before assembly, the inherent vibration frequency of the vibration source equipment (such as air conditioner, fan) related to the vibration noise source of the top before assembly, and the inherent vibration frequency of the top cover of the driver's room or the vibration source equipment arranged on the top cover after assembly; the first noise value at least includes the noise generated by the vibration source equipment related to the vibration noise source of the top after assembly. When detecting the vibration noise of the top of the driver's room, the top cover, the vibration source equipment arranged on the top cover, and the vibration source equipment not arranged on the top cover but possibly related to the vibration noise source of the top belong to the collection objects. In addition, the inherent vibration frequency can also include the inherent vibration frequency of other structures (such as left side wall, right side wall, front wall and rear wall) and other vibration source equipment (such as various electric or pneumatic devices such as wiper arranged on the front wall).

[0047] The frequency acquisition device can be arranged on the corresponding driver's room structure or vibration source equipment according to the driver's room vibration noise detection requirements; the noise acquisition device can be arranged on the corresponding vibration source equipment according to the driver's room vibration noise detection requirements, as shown in Figure 4 .

[0048] According to the preset sampling period, the inherent vibration frequency of the driver's room related structure before assembly, the inherent vibration frequency of the related vibration source equipment before assembly, and the inherent vibration frequency of the driver's room related structure or the vibration source equipment arranged on the related structure after assembly are collected statically and continuously, and the corresponding inherent vibration frequency data set is obtained, that is, the inherent vibration frequency data set of the driver's room related structure before assembly, the inherent vibration frequency data set of the related vibration source equipment before assembly, and the inherent vibration frequency data set of the driver's room related structure or the vibration source equipment arranged on the related structure after assembly.

[0049] According to the preset sampling period, the noise generated by the vibration source equipment related to the vibration noise source of the top after assembly is collected statically and continuously, and the corresponding first noise data set is obtained, that is, the first noise data set generated by the vibration source equipment related to the vibration noise source of the top after assembly.

[0050] Step 2: Process the data set to obtain the characteristic value.

[0051] From step 1, a plurality of natural vibration frequency data sets and a plurality of first noise data sets are obtained. Extreme value extraction is performed on each data set, and the extreme values constitute an extreme value data set. Then, one data is extracted from the extracted extreme value data set as a characteristic value, and each data set corresponds to a characteristic value. Thus, a plurality of natural vibration frequency characteristic values and a plurality of first noise characteristic values are obtained.

[0052] Step 3: Dynamically collect the vibration response frequency and the second noise value of the cab.

[0053] After completing the static collection, dynamic collection is performed. Under different operating environments and operating speeds of the locomotive, the vibration response frequency of the cab is collected by using a frequency collection device according to the vibration noise detection requirements of the cab, and the second noise value of the cab is collected by using a noise collection device. In this embodiment, the vibration response frequency at least includes the vibration response frequency of the cab-related structure and the vibration response frequency of the related vibration source equipment; and the second noise value at least includes the noise generated by the vibration source equipment related to the top vibration noise source.

[0054] For example, if it is necessary to detect the vibration noise of the top of the cab, the vibration response frequency at least includes the vibration response frequency of the cab roof and the vibration response frequency of the vibration source equipment related to the top vibration noise source; and the second noise value at least includes the noise generated by the vibration source equipment related to the top vibration noise source. In addition, the vibration response frequency can also include the vibration response frequencies of other structures (such as the left wall, the right wall, the front wall, and the rear wall) and other vibration source equipment (such as various electric or pneumatic devices such as wipers arranged on the front wall).

[0055] The dynamic collection is performed as much as possible under various operating environments and operating speeds, and the test is performed as much as possible to collect sufficient vibration response frequency samples, which helps the analysis of noise generation to be more comprehensive and complete.

[0056] Step 4: Process the data set to obtain the characteristic value.

[0057] From step 3, a plurality of vibration response frequency data sets and a plurality of second noise data sets are obtained. Extreme value extraction is performed on each data set, and the extreme values constitute an extreme value data set. Then, one data is extracted from the extracted extreme value data set as a characteristic value, and each data set corresponds to a characteristic value. Thus, a plurality of vibration response frequency characteristic values and a plurality of second noise characteristic values are obtained.

[0058] Step 5: Calculate the cavity natural frequency of the cab, and the specific calculation formula is:

[0059]

[0060] Wherein, f0 is the cavity inherent frequency, c is the sound speed, L is the driver room cavity longitudinal length, W is the driver room cavity transverse width, H is the driver room cavity vertical height.

[0061] Step 6: determining the noise generation source according to the inherent vibration frequency characteristic value, the first noise characteristic value, the second noise characteristic value, the vibration response frequency characteristic value and the cavity inherent frequency.

[0062] Referring to Figure 5 , the specific implementation process of determining the main source of noise generation is:

[0063] ①Comparing the detected second noise characteristic value with the first noise characteristic value, if |the first noise characteristic value-the second noise characteristic value|≤the set threshold value, that is, the first noise characteristic value and the second noise characteristic value are consistent, then the noise source C1 is the main source of noise generation, and the noise source C1 is the noise source corresponding to the first noise characteristic value.

[0064] ②Comparing the second noise characteristic value with the vibration response frequency characteristic value, if |the second noise characteristic value-the vibration response frequency characteristic value or the integer multiple of the vibration response frequency characteristic value|≤the set threshold value, that is, the second noise characteristic value and the vibration response frequency characteristic value (or integer multiple) are consistent, that is, |F0-kf i 1 |≤Δf, k=1, 2, 3, …, F0 is the second noise characteristic value, f i 1 is the i-th vibration response frequency characteristic value, and Δf is the set threshold value, then the noise sources C2, C3 and C4 are all possible noise generation sources, the noise source C2 refers to the cavity resonance noise source, the noise source C3 refers to the noise source corresponding to the inherent vibration frequency characteristic value (structure resonance generated), and the noise source C4 refers to the structure radiation noise caused by cavity resonance or resonance.

[0065] ③Based on ②, if |the vibration response frequency characteristic value-the cavity inherent frequency or the integer multiple of the cavity inherent frequency|≤the set threshold value, that is, the vibration response frequency characteristic value and the cavity inherent frequency are consistent, then the noise generation source is the noise source C2.

[0066] ④Based on ②, if |the vibration response frequency characteristic value-the inherent vibration frequency characteristic value or the integer multiple of the inherent vibration frequency characteristic value|≤the set threshold value, that is, the vibration response frequency characteristic value and the inherent vibration frequency characteristic value (or integer multiple) are consistent, then the noise generation source is the noise source C3.

[0067] If the absolute value of the vibration response frequency characteristic value minus the cavity natural frequency or the integer times of the cavity natural frequency is less than or equal to the set threshold value, or the absolute value of the vibration response frequency characteristic value minus the natural vibration frequency characteristic value or the integer times of the natural vibration frequency characteristic value is less than or equal to the set threshold value, that is, the vibration response frequency characteristic value coincides with the cavity natural frequency, or the vibration response frequency characteristic value coincides with the natural vibration frequency characteristic value, the noise source is the noise source C4.

[0068] The mathematical expression that the vibration response frequency characteristic value coincides with the cavity natural frequency is: |f i 1 -kf0|≤Δf, k = 1, 2, 3, …, wherein, f i 1 f0 is the cavity natural frequency.

[0069] The mathematical expression that the vibration response frequency characteristic value coincides with the natural vibration frequency characteristic value is: k = 1, 2, 3, …, wherein, fj is the jth natural vibration frequency characteristic value. In the embodiment, the set threshold value is less than or equal to 5 Hz.

[0070] For example, it is detected that the second noise characteristic value of a certain cab is 114 dBA when the cab is running under a certain working condition, and the noise value exceeds the normal range. The vibration response frequency characteristic value of a certain structure of the cab under the working condition is 230 Hz, and the natural vibration frequency characteristic value of the structure is 76 Hz, which is detected statically. According to the judgment of step 6, the vibration response frequency characteristic value coincides with the natural vibration frequency characteristic value, and it can be judged that the noise source is mainly caused by the resonance of the structure under the working condition.

[0071] The above only discloses specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or modifications within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method of detecting vibration noise in a cab of a locomotive, the method comprising: The method comprises the following steps: obtaining the inherent vibration frequency of the driver's cabin structure and the vibration source equipment collected statically, and then obtaining an inherent vibration frequency dataset; processing the inherent vibration frequency dataset to obtain inherent vibration frequency characteristic values; obtaining the first noise value of the driver's cabin vibration source equipment collected statically, and then obtaining a first noise dataset; processing the first noise dataset to obtain first noise characteristic values; obtaining the vibration response frequency of the driver's cabin structure and the vibration source equipment collected under different operating environments and different operating speeds, and then obtaining a vibration response frequency dataset; processing the vibration response frequency dataset to obtain vibration response frequency characteristic values; obtaining the second noise value of the driver's cabin vibration source equipment collected under different operating environments and different operating speeds, and then obtaining a second noise dataset; processing the second noise dataset to obtain second noise characteristic values; calculating the cavity inherent frequency of the driver's cabin; determining the noise source according to the inherent vibration frequency characteristic values, the first noise characteristic values, the second noise characteristic values, the vibration response frequency characteristic values and the cavity inherent frequency by analyzing the relationship between the inherent vibration frequency characteristics and the vibration response frequency characteristics of the driver's cabin structure and the vibration source equipment, the noise characteristics of the driver's cabin vibration source equipment and the cavity inherent frequency; wherein, processing the dataset to obtain corresponding characteristic values comprises: extracting extreme values from the dataset to obtain an extreme value dataset composed of extreme values; extracting a data from the extreme value dataset as the corresponding characteristic value of the dataset; the dataset is the inherent vibration frequency dataset, the first noise dataset, the vibration response frequency dataset or the second noise dataset, and the corresponding characteristic value of the dataset is the inherent vibration frequency characteristic value, the first noise characteristic value, the vibration response frequency characteristic value or the second noise characteristic value.

2. The locomotive cab vibration noise detection method of claim 1, wherein The inherent vibration frequency at least comprises the inherent vibration frequency of the driver's cabin related structure before assembly, the inherent vibration frequency of the related vibration source equipment before assembly and the inherent vibration frequency of the driver's cabin related structure or the vibration source equipment arranged on the related structure after assembly; The first noise value at least comprises the noise generated by the driver's cabin related vibration source equipment after assembly; wherein, related refers to possibly related to the noise source.

3. The locomotive cab vibration noise detection method of claim 1, wherein The vibration response frequency at least comprises the vibration response frequency of the driver's cabin related structure and the vibration response frequency of the related vibration source equipment; The second noise value at least comprises the noise generated by the driver's cabin related vibration source equipment.

4. The locomotive cab vibration noise detection method of claim 1, wherein, The calculation formula of the cavity inherent frequency is: wherein, is the natural frequency of the cavity, is the speed of sound, is the longitudinal length of the cab cavity, is the lateral width of the cab cavity, is the vertical height of the cab cavity.

5. The locomotive cab vibration noise detection method of any one of claims 1-4, wherein, The specific implementation process of determining the noise source is: when |the first noise characteristic value-the second noise characteristic value|≤a set threshold value, the noise source corresponding to the first noise characteristic value is the noise source; when |the second noise characteristic value-the vibration response frequency characteristic value or the integer multiple of the vibration response frequency characteristic value|≤a set threshold value, and |the vibration response frequency characteristic value-the cavity inherent frequency or the integer multiple of the cavity inherent frequency|≤a set threshold value, the noise source is generated by cavity resonance. When ∣second noise characteristic value - vibration response frequency characteristic value or integer times of vibration response frequency characteristic value∣≤set threshold value, and ∣vibration response frequency characteristic value - natural vibration frequency characteristic value or integer times of natural vibration frequency characteristic value∣≤set threshold value, then the noise source corresponding to the natural vibration frequency characteristic value is the noise source; When ∣second noise characteristic value - vibration response frequency characteristic value or integer times of vibration response frequency characteristic value∣≤set threshold value, and ∣vibration response frequency characteristic value - cavity natural frequency or integer times of cavity natural frequency∣≤set threshold value or ∣vibration response frequency characteristic value - natural vibration frequency characteristic value or integer times of natural vibration frequency characteristic value∣≤set threshold value, then the noise source includes cavity resonance or resonance caused structural radiation noise.

6. The locomotive cab vibration noise detection method of claim 5, wherein, The set threshold value is 5 Hz.

7. A locomotive cab vibration noise detection apparatus comprising a memory and a processor, said memory having stored thereon a computer program capable of running on said processor, characterized in that: The processor executes the steps of the locomotive cab vibration noise detection method of any one of claims 1-6 when the computer program is run.

8. A computer-readable storage medium, which is a non-volatile storage medium or a non-transitory storage medium, having stored thereon a computer program, characterized in that: The computer program is run by the processor to execute the steps of the locomotive cab vibration noise detection method of any one of claims 1-6.

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