Seat assembly road spectrum generation method and device

Abstract

The invention discloses a seat assembly road spectrum generation method and device, and the method comprises the steps: obtaining a sample vehicle parameter, and setting a vehicle road surface driving test condition; vibration information at the seat assembly is collected based on the preset road condition, the preset speed and the preset time of driving of the test sample vehicle; performing data processing on the acquired vibration information to obtain effective data; according to the low-frequency vibration simulation requirement of the test bench, setting a sampling frequency, and re-sampling effective data to obtain a processed time domain signal; performing Fourier transform on the time domain signal to obtain a power spectrum frequency domain signal, and generating a seat assembly road spectrum database based on the power spectrum frequency domain signal; according to the method, the assembly bench test vibration spectrum collection iteration process is made to be streamlined and standardized, the repeatability and consistency of evaluation and test results are improved, support is provided for the performance evaluation test accuracy of the seat assembly, and the customer satisfaction is improved; through data acquisition, data interception, frequency setting and parameter optimization, road spectrum data time domain signals are converted into frequency domain signals which can be used by a seat rack, the road surface excitation state is perfectly restored, and the accuracy and timeliness of the test are improved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle testing technology, and in particular to a method and device for generating a seat assembly road spectrum. Background Art

[0002] In the vehicle development process, in addition to the four-post environmental chamber that can simulate roads to dynamically evaluate the vehicle, the assembly test bench can also simulate the excitation state of the corresponding assembly under different roads to evaluate the abnormal noise state of components from the assembly dimension.

[0003] The seat is an assembly that is in direct contact with the vehicle when driving, and its abnormal noise status directly affects the vehicle riding experience. Therefore, the accuracy of the seat bench abnormal noise evaluation becomes very important. The iterative method of collecting the vibration spectrum of the assembly abnormal noise bench test is a necessary condition for conducting the assembly bench test and is particularly important. Summary of the invention

[0004] The object of the present invention is to provide a method and device for generating a seat assembly road map to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for generating a seat assembly road spectrum, comprising:

[0006] Obtaining the parameters of the sample vehicle and setting the vehicle road driving test conditions, wherein the vehicle road driving test conditions include a preset road condition, a preset vehicle speed and a preset time for the test vehicle to drive;

[0007] collecting vibration information of the seat assembly based on a preset road condition, a preset vehicle speed and a preset time during which the test vehicle is traveling;

[0008] Perform data processing on the acquired vibration information to obtain valid data;

[0009] According to the low-frequency vibration simulation requirements of the test bench, the sampling frequency is set, and the valid data is resampled to obtain the processed time domain signal;

[0010] Perform Fourier transform on the time domain signal to obtain the power spectrum frequency domain signal, and generate the seat assembly road spectrum database based on the power spectrum frequency domain signal.

[0011] Furthermore, sample vehicle parameters including sample vehicle number, model, vehicle identification VIN number, and mileage are obtained and recorded.

[0012] Furthermore, the preset road conditions for the test vehicle to travel also include:

[0013] According to different driving road characteristics, a variety of preset road conditions for test vehicles are set, and test data for each preset road condition is collected.

[0014] Furthermore, collecting vibration information of the seat assembly based on a preset road condition, a preset vehicle speed and a preset time of the test vehicle also includes:

[0015] Collect vibration information at the front or end of the seat rail of the seat assembly and set the sampling frequency according to the test requirements.

[0016] Furthermore, the acquired vibration information is processed to obtain valid data, which also includes:

[0017] The validity of the vibration information is determined. If there is an interference signal and / or signal loss problem, the vibration information is acquired again after the test failure is eliminated until the vibration information is determined to be valid data.

[0018] Furthermore, the valid data is intercepted to remove the beginning and the end of the non-required data to generate the valid test data.

[0019] Furthermore, according to the low-frequency vibration simulation requirements of the test bench, the sampling frequency is set, and the valid data is resampled and processed to obtain the processed time domain signal, which also includes:

[0020] After resampling the valid data, abnormal peaks are identified, the obvious large displacement low-frequency vibration is removed, the DC interference signal in the data is removed, and the processed time domain signal is obtained.

[0021] Further, Fourier transform is performed on the time domain signal to obtain a power spectrum frequency domain signal, and a seat assembly road spectrum database is generated based on the power spectrum frequency domain signal, further comprising:

[0022] Generate a spectrum file based on the power spectrum frequency domain signal and define the target signal bandwidth.

[0023] Furthermore, the validity of the power spectrum frequency domain signal is determined by using the vibration test of the test bench to determine whether the power spectrum frequency domain signal has any abnormality. If there is any abnormality, the valid data is re-intercepted to remove the non-required data at the beginning and end to generate valid test data.

[0024] If there is an abnormality in the part, the road spectrum file generated based on the power spectrum frequency domain signal is determined to be a valid road spectrum file, and the valid road spectrum file is entered into the seat assembly road spectrum database.

[0025] On the other hand, a seat assembly route map generation device is provided, which is applied to any one of the seat assembly route map generation methods described above, comprising:

[0026] The test condition construction module is used to obtain the parameters of the sample vehicle and set the vehicle road driving test condition;

[0027] A collection module, used for collecting vibration information of the seat assembly based on a preset road condition, a preset vehicle speed and a preset time during which the test vehicle is traveling;

[0028] The first processing module is used to process the acquired vibration information to obtain valid data;

[0029] The second processing module is used to set the sampling frequency according to the low-frequency vibration simulation requirements of the test bench, resample the valid data, and obtain the processed time domain signal;

[0030] The third processing module is used to perform Fourier transform on the time domain signal to obtain the power spectrum frequency domain signal, and generate a seat assembly road spectrum database based on the power spectrum frequency domain signal.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention mainly solves the problem of the lack of existing methods for collecting and generating road spectra of seat assemblies, so that the iterative process of collecting vibration spectra of assembly bench tests is streamlined and standardized, the repeatability and consistency of evaluation and test results are improved, and support is provided for the accuracy of performance evaluation tests of seat assemblies, thus filling the gap in this field and better improving customer satisfaction; the present invention provides a comprehensive method for collecting and generating road spectra of seat assemblies, which converts the time domain signals of collected road spectrum data into frequency domain signals that can be used by the seat bench through operations such as sensor deployment, setting relevant parameters, data collection, data interception, frequency setting, and parameter optimization, thereby perfectly restoring the road excitation state and improving the accuracy and timeliness of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a flow chart of a method for generating a seat assembly road spectrum in an embodiment of the present invention;

[0033] Figure 2 It is a connection block diagram of a seat assembly route spectrum generating device in an embodiment of the present invention;

[0034] In the figure: 10, test condition construction module; 20, acquisition module; 30, first processing module; 40, second processing module; 50, third processing module. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Please refer to the attached drawings of the specification, the present invention provides a technical solution: a method for generating a seat assembly road spectrum, comprising the following steps:

[0039] S102, obtaining parameters of the sample vehicle and setting a vehicle road driving test condition, wherein the vehicle road driving test condition includes a preset road condition, a preset vehicle speed and a preset time for the test vehicle to drive;

[0040] Specifically, the sample vehicle parameters including sample vehicle number, model, vehicle identification VIN number, and mileage are obtained and recorded.

[0041] Among them, test preparation, confirm that the test vehicle and seats are intact, without major defects, ensure that there are no debris, and record the basic parameters of the vehicle;

[0042] Specifically, according to different driving road characteristics, a plurality of preset road conditions for the test vehicle are set, and test data for each preset road condition is collected.

[0043] Among them, in this embodiment, the test environment is preferably 23±2℃, the wind speed at a height of 1.2m along the measurement route is less than 5m / s, the road surface is dry, and there is no water or snow; road surface features are selected, and road test is carried out at the set vehicle speed, bumpy road seat vibration data is collected, and the vehicle speed is set, and the test sample vehicle is driving on the preset road surface and speed for data collection, and the collection is preferably repeated at least twice; in this embodiment, the vehicle preferably passes through different road surface features continuously during the test, and examples include 15 different road surfaces including dilapidated road, rail road, twisted road, small round bumps, cement road, washboard road, cobblestone, Belgium, fish scale pit, parking lot road, large round bumps, wavy road, pulse road, rope road, and rough asphalt road, and the cycle is at least three times; the data obtained by repeated collection are selected, and the data must meet the working condition requirements, and the time is at least 10s.

[0044] S104, collecting vibration information of the seat assembly based on a preset road condition, a preset vehicle speed, and a preset time during which the test vehicle is traveling;

[0045] Specifically, vibration information is collected at the front end or the end of the seat rail of the seat assembly, and the sampling frequency is set according to the test requirements.

[0046] Among them, the vibration sensors should be arranged at the front end of the left rail and the rear end of the right rail of the seat, the data collector should be connected to the test computer and the sensor respectively, the channel connected to the sensor should be checked, the direction displayed by the LMS software should correspond to the direction of the sensor on the rail, the input mode should be changed to ICP, and the sensitivity of the sensor in different directions should be input in the software respectively, and the upper limit of the detection frequency should be adjusted to 1024Hz.

[0047] S106, performing data processing on the acquired vibration information to obtain valid data;

[0048] Specifically, the validity of the vibration information is determined. If there is an interference signal and / or a signal loss problem, the vibration information is reacquired after the test failure is eliminated until the vibration information is determined to be valid data.

[0049] Among them, the validity of the selected data is compared and judged. If there are abnormal interference signals, signal loss, etc., the test equipment should be checked and the vibration information should be repeatedly obtained until the data is valid.

[0050] Specifically, the valid data is intercepted to remove the beginning and the end of the non-required data to generate the valid test data.

[0051] S108. According to the low-frequency vibration simulation requirements of the test bench, the sampling frequency is set, and the valid data is resampled to obtain a processed time domain signal;

[0052] Specifically, after resampling the valid data, abnormal peaks are identified, low-frequency vibrations with obvious large displacements are removed, and DC interference signals in the data are removed to obtain the processed time domain signal.

[0053] Among them, the intercepted data is resampled with a sampling frequency of 512Hz to meet the needs of low-frequency vibration simulation of the test bench; the abnormal peaks of the sampled data are identified and removed to remove obvious large-displacement low-frequency vibrations to prevent damage to the exciter caused by exceeding the exciter during test bench simulation; zero-point drift processing is performed to remove DC interference signals in the data to ensure that the final random vibration signal vibrates at the zero axis.

[0054] S110, performing Fourier transform on the time domain signal to obtain a power spectrum frequency domain signal, and generating a seat assembly road spectrum database based on the power spectrum frequency domain signal.

[0055] Specifically, a spectrum file is generated based on the power spectrum frequency domain signal, and the target signal bandwidth is defined.

[0056] Among them, a frequency domain vibration signal is generated, the processed time domain signal is Fourier transformed, the power spectrum frequency domain signal (PSD) is obtained as a road spectrum file, and the target signal bandwidth is defined as 5Hz to 100Hz.

[0057] Specifically, the validity of the power spectrum frequency domain signal is determined, and whether the power spectrum frequency domain signal is abnormal is determined by the vibration test of the test bench. If there is an abnormality, the valid data is re-intercepted, and the non-required data at the beginning and end are removed to generate valid test data;

[0058] If there is an abnormality in the part, the road spectrum file generated based on the power spectrum frequency domain signal is determined to be a valid road spectrum file, and the valid road spectrum file is entered into the seat assembly road spectrum database.

[0059] Among them, the validity of the formed road spectrum signal is judged, and the frequency domain signal is confirmed whether there is an abnormality through vibration test bench excitation. If there is an abnormality, it is necessary to repeat the operation of intercepting valid data, and generate valid test data after removing non-required data at the beginning and end. The valid road spectrum file is entered into the seat assembly road spectrum database.

[0060] On the other hand, a seat assembly route map generating device is provided, which is applied to any one of the seat assembly route map generating methods described above, comprising:

[0061] The test condition construction module 10 is used to obtain the parameters of the sample vehicle and set the vehicle road driving test condition;

[0062] The sample vehicle parameters include the sample vehicle number, model, vehicle identification VIN number, and mileage, and are recorded. According to different road surface characteristics, a variety of preset road conditions for test vehicles are set, and test data for each preset road condition is collected.

[0063] The collection module 20 is used to collect vibration information of the seat assembly based on the preset road conditions, preset vehicle speed and preset time of the test vehicle;

[0064] Among them, vibration information is collected at the front end or end of the seat rail of the seat assembly, and the sampling frequency is set according to the test requirements.

[0065] The first processing module 30 is used to process the acquired vibration information to obtain valid data;

[0066] The validity of the vibration information is judged. If there is an interference signal and / or signal loss problem, the vibration information is acquired again after the test fault is eliminated until the vibration information is judged to be valid data. The valid data is intercepted, and the valid test data is generated after removing the non-required data at the beginning and the end.

[0067] The second processing module 40 is used to set the sampling frequency according to the low-frequency vibration simulation requirements of the test bench, resample the valid data, and obtain a processed time domain signal;

[0068] Among them, after resampling the valid data, abnormal peaks are identified, the obvious large displacement low-frequency vibration is removed, the DC interference signal in the data is removed, and the processed time domain signal is obtained.

[0069] The third processing module 50 is used to perform Fourier transform on the time domain signal to obtain a power spectrum frequency domain signal, and generate a seat assembly road spectrum database based on the power spectrum frequency domain signal.

[0070] Among them, a road spectrum file is generated based on the power spectrum frequency domain signal, and the target signal bandwidth is defined; the validity of the power spectrum frequency domain signal is judged, and whether the power spectrum frequency domain signal has an abnormality is determined by the vibration test of the test bench. If there is an abnormality, the valid data is re-intercepted, and the valid test data is generated after removing the non-required data at the beginning and the end; if there is an abnormality, the road spectrum file generated based on the power spectrum frequency domain signal is judged to be a valid road spectrum file, and the valid road spectrum file is entered into the seat assembly road spectrum database.

[0071] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A seat assembly road map generation method, characterized in that: include: Obtaining the parameters of the sample vehicle and setting the vehicle road driving test conditions, wherein the vehicle road driving test conditions include a preset road condition, a preset vehicle speed and a preset time for the test vehicle to drive; collecting vibration information of the seat assembly based on a preset road condition, a preset vehicle speed and a preset time during which the test vehicle is traveling; Perform data processing on the acquired vibration information to obtain valid data; According to the low-frequency vibration simulation requirements of the test bench, the sampling frequency is set, and the valid data is resampled to obtain the processed time domain signal; Perform Fourier transform on the time domain signal to obtain the power spectrum frequency domain signal, and generate the seat assembly road spectrum database based on the power spectrum frequency domain signal.

2. The seat assembly road map generation method according to claim 1, characterized in that: Obtain sample vehicle parameters including sample vehicle number, model, vehicle identification VIN number, and mileage, and record them.

3. The seat assembly road map generation method according to claim 1, characterized in that: The preset road conditions for the test vehicle also include: According to different driving road characteristics, a variety of preset road conditions for test vehicles are set, and test data for each preset road condition is collected.

4. The seat assembly road map generation method according to claim 1, characterized in that: The vibration information of the seat assembly is collected based on the preset road conditions, preset vehicle speed and preset time of the test vehicle, and also includes: Collect vibration information at the front or end of the seat rail of the seat assembly and set the sampling frequency according to the test requirements.

5. The seat assembly road map generation method according to claim 1, characterized in that: The acquired vibration information is processed to obtain valid data, which also includes: The validity of the vibration information is determined. If there is an interference signal and / or signal loss problem, the vibration information is acquired again after the test failure is eliminated until the vibration information is determined to be valid data.

6. The seat assembly road map generation method according to claim 5, characterized in that: The valid data is intercepted to remove the non-required data at the beginning and end to generate valid test data.

7. The seat assembly road map generation method according to claim 6, characterized in that: According to the low-frequency vibration simulation requirements of the test bench, the sampling frequency is set, and the valid data is resampled and processed to obtain the processed time domain signal, which also includes: After resampling the valid data, abnormal peaks are identified, the obvious large displacement low-frequency vibration is removed, the DC interference signal in the data is removed, and the processed time domain signal is obtained.

8. The seat assembly road map generation method according to claim 7, characterized in that: Performing Fourier transform on the time domain signal to obtain the power spectrum frequency domain signal, and generating the seat assembly road spectrum database based on the power spectrum frequency domain signal, further comprising: Generate a spectrum file based on the power spectrum frequency domain signal and define the target signal bandwidth.

9. The seat assembly road map generation method according to claim 8, characterized in that: include: Determine the validity of the power spectrum frequency domain signal, and determine whether the power spectrum frequency domain signal is abnormal through the vibration test of the test bench. If there is an abnormality, re-intercept the valid data, remove the non-required data at the beginning and end, and generate valid test data; If there is an abnormality in the part, the road spectrum file generated based on the power spectrum frequency domain signal is determined to be a valid road spectrum file, and the valid road spectrum file is entered into the seat assembly road spectrum database.

10. A seat assembly route map generating device, applied to a seat assembly route map generating method according to any one of claims 1 to 9, characterized in that: include: The test condition construction module is used to obtain the parameters of the sample vehicle and set the vehicle road driving test condition; A collection module, used for collecting vibration information of the seat assembly based on a preset road condition, a preset vehicle speed and a preset time during which the test vehicle is traveling; The first processing module is used to process the acquired vibration information to obtain valid data; The second processing module is used to set the sampling frequency according to the low-frequency vibration simulation requirements of the test bench, resample the valid data, and obtain the processed time domain signal; The third processing module is used to perform Fourier transform on the time domain signal to obtain the power spectrum frequency domain signal, and generate a seat assembly road spectrum database based on the power spectrum frequency domain signal.

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