A whole vehicle sound source noise targeting method, system, device and medium

Abstract

The application provides a whole vehicle sound source noise target setting method, system, device and medium, relates to the NVH technical field, and the method comprises the following steps: firstly, obtaining the sound pressure level noise data of a test vehicle under a target working condition through a first bench test; then, respectively determining the sound transmission functions of the test vehicle and a target vehicle through a second bench test; then, performing frequency spectrum analysis on the sound pressure level noise of the test vehicle to obtain target sound pressure level noise in a specific frequency range. Combined with the sound pressure level noise of the test vehicle and the sound transmission function thereof, the sound source noise of the test vehicle is calculated; further, the target sound pressure level noise and the sound transmission function of the target vehicle are utilized to determine the sound source noise of the target vehicle; finally, according to the sound source noises of the test vehicle and the target vehicle, the sound source noise target value of the target vehicle is set. The application can effectively solve the problem that the bench test is inconsistent with the actual performance of the whole vehicle, and improve the accuracy and rationality of the sound source noise target setting.

Description

Technical Field

[0001] This application relates to the field of automotive NVH technology, and in particular to a method, system, device and medium for determining the target of vehicle sound source noise. Background Technology

[0002] With the rapid development of new energy vehicles, many automakers are developing new energy models based on existing gasoline-powered vehicle platforms. This development model typically achieves the power conversion of new energy vehicles by changing the powertrain and its matching systems. However, because the vehicle body and chassis structure remain consistent with gasoline vehicles, noise issues are particularly prominent in the development of new energy powertrains.

[0003] Currently, the industry typically uses sound pressure level or sound power as indicators to evaluate powertrain noise, for example, setting the noise level below 30dB. However, due to the unique characteristics of powertrain noise in new energy vehicles, these indicators are difficult to accurately reflect the actual performance under vehicle conditions. Through subjective evaluation and objective testing at the vehicle level, it has been found that existing powertrain noise often does not meet expectations under vehicle conditions.

[0004] Therefore, there is an urgent need for a new method for setting targets for vehicle noise sources. Summary of the Invention

[0005] In view of the above problems, embodiments of this application provide a method, system, device, and medium for determining the target of vehicle sound source noise, so as to overcome the above problems or at least partially solve the above problems.

[0006] In a first aspect, this application provides a method for determining the target noise of a vehicle's sound sources, the method comprising:

[0007] The first bench test was conducted on the test vehicle to obtain the first sound pressure level noise of the test vehicle under the target test conditions;

[0008] A second bench test was conducted on the test vehicle and the target vehicle respectively to determine the first acoustic transfer function of the test vehicle and the second acoustic transfer function of the target vehicle.

[0009] Spectral analysis is performed on the first sound pressure level noise to determine the target sound pressure level noise within a preset frequency range;

[0010] The first sound source noise of the test vehicle is determined based on the first sound pressure level noise and the first sound transfer function;

[0011] The second sound source noise of the target vehicle is determined based on the target sound pressure level noise and the second sound transfer function;

[0012] The target noise value of the target vehicle is determined based on the first noise source and the second noise source.

[0013] Optionally, determining the target noise value of the target vehicle based on the first noise source and the second noise source includes:

[0014] The first bench test was conducted on the test vehicle to obtain the noise of the drive motor of the test vehicle;

[0015] The noise deviation value of the sound source is obtained based on the noise of the first sound source and the noise of the drive motor;

[0016] The target noise value of the target vehicle is determined based on the second noise source and the noise source deviation value.

[0017] Optionally, the step of performing spectral analysis on the first sound pressure level noise to obtain the target sound pressure level noise within a preset frequency range includes:

[0018] The first sound pressure level noise is subjected to spectral expansion according to a preset frequency gradient to obtain multiple frequency points of the first sound pressure level noise within the preset frequency range;

[0019] Analyze the sound pressure level noise corresponding to each of the frequency points, and determine the maximum sound pressure level noise among the various sound pressure level noises as the target sound pressure level noise.

[0020] Optionally, after determining the target noise value of the target vehicle, the method further includes:

[0021] Based on the target noise value of the sound source, determine the target frequency of the target noise value of the sound source;

[0022] The constrained rotational speed of the motor of the target vehicle is determined based on the target frequency of the noise target value of the sound source.

[0023] Optionally, determining the constraint speed of the motor of the target vehicle based on the target frequency of the sound source noise target value includes:

[0024] When the motor of the target vehicle is accelerating, obtain the number of teeth on the driving end of the first-stage reducer of the motor;

[0025] The constrained rotational speed is determined based on the target frequency of the noise source target value and the number of teeth at the active end of the first-stage reducer.

[0026] Optionally, determining the constraint speed of the motor of the target vehicle based on the target frequency of the sound source noise target value includes:

[0027] When the motor of the target vehicle is decelerating, the number of teeth on the driving end of the first-stage reducer of the motor, the number of teeth on the driven end of the first-stage reducer, and the number of teeth on the driving end of the second-stage reducer of the motor are obtained.

[0028] The constrained rotational speed is determined based on the target frequency of the noise source target value, the number of teeth at the active end of the first-stage reducer, the number of teeth at the passive end of the first-stage reducer, and the number of teeth at the active end of the second-stage reducer.

[0029] Optionally, the methods for determining the acoustic transfer function include:

[0030] During the second bench test, the time-domain sound pressure level noise and the sound pressure level noise output by the signal source within the target area of ​​the vehicle are collected. The vehicle can be either the test vehicle or the target vehicle.

[0031] The time-domain sound pressure level noise is transformed in the frequency domain to obtain the frequency-domain sound pressure level noise;

[0032] The acoustic propagation function is calculated based on the sound pressure level noise output by the signal source and the frequency domain sound pressure level noise.

[0033] A second aspect of this application provides a system for targeting vehicle noise sources, the system comprising:

[0034] The first test module is used to conduct the first bench test on the test vehicle and obtain the first sound pressure level noise of the test vehicle under the target test conditions.

[0035] The second test module is used to conduct a second bench test on the test vehicle and the target vehicle respectively, and to determine the first acoustic transfer function of the test vehicle and the second acoustic transfer function of the target vehicle.

[0036] The spectrum analysis module is used to perform spectrum analysis on the first sound pressure level noise and determine the target sound pressure level noise within a preset frequency range.

[0037] The first determining module is used to determine the first sound source noise of the test vehicle based on the first sound pressure level noise and the first sound transfer function;

[0038] The second determining module is used to determine the second sound source noise of the target vehicle based on the target sound pressure level noise and the second sound transfer function;

[0039] The third determining module is used to determine the target noise value of the target vehicle based on the first noise source and the second noise source.

[0040] Optionally, the third determining module, which determines the target noise value of the target vehicle based on the first sound source noise and the second sound source noise, includes:

[0041] The first test submodule is used to conduct a first bench test on the test vehicle to obtain the drive motor noise of the test vehicle.

[0042] The first determining submodule is used to obtain the sound source noise deviation value based on the first sound source noise and the drive motor noise;

[0043] The second determining submodule is used to determine the target noise value of the target vehicle based on the second noise source and the noise source deviation value.

[0044] Optionally, the step of performing spectral analysis on the first sound pressure level noise to obtain a target sound pressure level noise within a preset frequency range, wherein the spectral analysis module includes:

[0045] The spectrum expansion submodule is used to expand the spectrum of the first sound pressure level noise according to a preset frequency gradient to obtain multiple frequency points of the first sound pressure level noise within the preset frequency range.

[0046] The analysis submodule is used to analyze the sound pressure level noise corresponding to each of the frequency points, and to determine the maximum sound pressure level noise among the various sound pressure level noises as the target sound pressure level noise.

[0047] Optionally, the system further includes:

[0048] The third determining submodule is used to determine the target frequency of the sound source noise target value based on the sound source noise target value;

[0049] The fourth determining submodule is used to determine the constrained rotational speed of the motor of the target vehicle based on the target frequency of the sound source noise target value.

[0050] Optionally, the fourth determining submodule, which determines the constraint speed of the motor of the target vehicle based on the target frequency of the sound source noise target value, includes:

[0051] The first acquisition subunit is used to acquire the number of teeth at the driving end of the first-stage reducer of the target vehicle when the motor is accelerating.

[0052] The first determining subunit is used to determine the constrained rotational speed based on the target frequency of the sound source noise target value and the number of teeth at the active end of the first-stage reducer.

[0053] Optionally, the fourth determining submodule, which determines the constraint speed of the motor of the target vehicle based on the target frequency of the sound source noise target value, includes:

[0054] The second acquisition subunit is used to acquire the number of teeth at the driving end of the first-stage reducer of the motor, the number of teeth at the driven end of the first-stage reducer, and the number of teeth at the driving end of the second-stage reducer of the motor when the motor of the target vehicle is decelerating.

[0055] The second determining subunit is used to determine the constrained rotational speed based on the target frequency of the sound source noise target value, the number of teeth at the active end of the first-stage reducer, the number of teeth at the passive end of the first-stage reducer, and the number of teeth at the active end of the second-stage reducer.

[0056] Optionally, the system further includes:

[0057] The acquisition submodule is used to acquire the time-domain sound pressure level noise and the sound pressure level noise output by the signal source within the target area of ​​the vehicle during the second bench test. The vehicle is either the test vehicle or the target vehicle.

[0058] The frequency domain transformation submodule is used to perform frequency domain transformation on the time domain sound pressure level noise to obtain the frequency domain sound pressure level noise;

[0059] The calculation submodule is used to calculate the acoustic transmission function based on the sound pressure level noise output by the signal source and the frequency domain sound pressure level noise.

[0060] In a third aspect, this application provides an electronic device including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the vehicle noise target setting method as described in the first aspect of this application.

[0061] In a fourth aspect, this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method for determining the target noise of a vehicle sound source as described in the first aspect of this application.

[0062] The beneficial effects of this application are:

[0063] This application provides a method for setting a target for vehicle sound source noise. The method includes: conducting a first bench test on a test vehicle to obtain a first sound pressure level noise of the test vehicle under a target test condition; conducting a second bench test on both the test vehicle and the target vehicle to determine a first acoustic transfer function of the test vehicle and a second acoustic transfer function of the target vehicle; performing spectral analysis on the first sound pressure level noise to determine a target sound pressure level noise within a preset frequency range; determining a first sound source noise of the test vehicle based on the first sound pressure level noise and the first acoustic transfer function; determining a second sound source noise of the target vehicle based on the target sound pressure level noise and the second acoustic transfer function; and determining a target value for the sound source noise of the target vehicle based on the first sound source noise and the second sound source noise. This application accurately sets the target value for the sound source noise of the target vehicle by calculating the acoustic transfer function and sound source noise of the test vehicle and the target vehicle, thereby effectively solving the problem of inconsistency between bench testing and actual vehicle performance, and improving the accuracy and rationality of sound source noise target setting. Attached Figure Description

[0064] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0065] Figure 1 This is a flowchart illustrating the steps of a method for determining the target noise of a vehicle sound source according to an embodiment of this application.

[0066] Figure 2 This is a flowchart illustrating a method for determining the target noise of a vehicle sound source, as provided in an embodiment of this application.

[0067] Figure 3 This is a schematic diagram of a vehicle sound source noise target determination system provided in an embodiment of this application;

[0068] Figure 4 This is a schematic diagram of an electronic device provided in an embodiment of this application. Detailed Implementation

[0069] Exemplary embodiments of this application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of this application and to fully convey the scope of this application to those skilled in the art.

[0070] In view of the above problems, the first aspect of the present application provides a method for determining the target noise of a vehicle sound source, the method as follows: Figure 1 As shown, it includes:

[0071] Step S101: Perform a first bench test on the test vehicle to obtain the first sound pressure level noise of the test vehicle under the target test conditions.

[0072] In this step, the test vehicle undergoes its first bench test under the target test conditions, and the first sound pressure level noise level of the test vehicle under the target test conditions is recorded. In this application, the target test conditions can be full throttle (WOT), half throttle (POT), and deceleration (CD) conditions, etc. These data reflect the overall noise characteristics of the test vehicle in the actual operating environment and are the basis for subsequent analysis. The test should ensure that the layout, loading conditions, environment, and in-vehicle noise receiving points of the test vehicle comply with standard specifications to ensure the accuracy of the data. In this application, the in-vehicle noise receiving points can be the driver's head, the right side of the middle row, or the right side of the third row, etc. The first bench test can be conducted on a lift bench in an anechoic chamber.

[0073] Step S102: Perform a second bench test on the test vehicle and the target vehicle respectively to determine the first acoustic transmission function of the test vehicle and the second acoustic transmission function of the target vehicle.

[0074] In this step, a second bench test is conducted on both the test vehicle and the target vehicle. The sound transmission characteristics from the sound source to the noise receiving point inside the vehicle (such as the driver's head) are measured for both the test vehicle and the target vehicle. The first sound transfer function of the test vehicle and the second sound transfer function of the target vehicle are obtained. The sound transfer function is the Acoustic Transfer Function (ATF), which reflects the sound propagation path and attenuation characteristics under different vehicle acoustic environments. It is an important basis for inferring the source noise from the sound pressure level noise. In this application, the target vehicle is the basic prototype vehicle for research and development, while the test vehicle is a competing vehicle corresponding to the prototype vehicle for research and development. The second bench test can be conducted on a semi-anechoic chamber lifting bench.

[0075] Step S103: Perform spectral analysis on the first sound pressure level noise to determine the target sound pressure level noise within a preset frequency range.

[0076] In this step, a spectral analysis is performed on the first sound pressure level noise of the test vehicle to screen out the target sound pressure level noise within a preset frequency range. In this application, the preset spectral range is selected from the frequency band of 1000Hz-5000Hz, which is the most sensitive to the human ear. This allows for better focus on frequency components that have a greater impact on the human ear, ensuring that the formulation of the target value is more targeted and meaningful.

[0077] Step S104: Determine the first sound source noise of the test vehicle based on the first sound pressure level noise and the first sound transmission function.

[0078] In this step, the first sound pressure level noise and the first sound transfer function of the test vehicle are used to determine the first sound source noise through reverse acoustic derivation. Specifically, based on the theory that corresponding point = excitation source * sound transfer function, the first sound source noise = first sound pressure level noise / first sound transfer function can be solved in reverse.

[0079] Step S105: Determine the second sound source noise of the target vehicle based on the target sound pressure level noise and the second sound transmission function.

[0080] In this step, the second sound source noise of the target vehicle is calculated by combining the target sound pressure level noise and the second sound transfer function of the target vehicle through reverse acoustic derivation. Similarly, based on the theory that the corresponding point = excitation source * sound transfer function, the second sound source noise = target sound pressure level noise / second sound transfer function can be solved in reverse.

[0081] Step S106: Determine the target noise value of the target vehicle based on the first noise source and the second noise source.

[0082] In this step, based on the first sound source noise of the test vehicle and the second sound source noise of the target vehicle, and in conjunction with the overall vehicle acoustic design goals, the target value of the sound source noise of the target vehicle is determined.

[0083] This application calculates the acoustic transmission function and source noise of the test vehicle and the target vehicle to accurately determine the target value of the source noise of the target vehicle, thereby effectively solving the problem of inconsistency between bench testing and actual vehicle performance, and improving the accuracy and rationality of the source noise target setting.

[0084] In one embodiment, determining the target noise value of the target vehicle based on the first sound source noise and the second sound source noise includes:

[0085] The first bench test was conducted on the test vehicle to obtain the noise of the drive motor of the test vehicle;

[0086] The noise deviation value of the sound source is obtained based on the noise of the first sound source and the noise of the drive motor;

[0087] The target noise value of the target vehicle is determined based on the second noise source and the noise source deviation value.

[0088] In this embodiment, a first bench test is conducted on the test vehicle, and the noise of the drive motor of the test vehicle is collected under specific operating conditions, that is, the near-field motor noise characteristics of the powertrain. This step ensures that the drive motor is analyzed separately as the main source of vehicle noise, thereby improving the targeting of noise target values.

[0089] Furthermore, the deviation between the first sound source noise and the drive motor noise of the test vehicle is calculated. This deviation reflects the acoustic impact on the drive motor noise as it propagates through the acoustic path to the noise receiving point inside the vehicle, as well as the acoustic impact of the non-motor noise of the test vehicle on the overall vehicle sound source noise.

[0090] Furthermore, based on the deviation between the second noise source of the target vehicle and the calculated noise source, the target noise value for the target vehicle is determined. By incorporating the deviation value into the noise of the target vehicle, its acoustic characteristics under actual operating conditions can be more accurately reflected, and reasonable noise source optimization targets can be formulated.

[0091] In this embodiment, by introducing drive motor noise as a key variable and calculating the noise deviation value of the sound source, the true noise performance of the vehicle powertrain can be more comprehensively reflected. By analyzing the relationship between drive motor noise and sound source noise, the role of motor noise in the overall vehicle acoustic performance is clarified, which helps to optimize the design of the motor and its surroundings. In addition, based on scientific deviation calculation, the number of experiments and iterations is reduced, providing a clear direction for acoustic optimization of the target vehicle and improving development efficiency.

[0092] In one embodiment, the step of performing spectral analysis on the first sound pressure level noise to obtain a target sound pressure level noise within a preset frequency range includes:

[0093] The first sound pressure level noise is subjected to spectral expansion according to a preset frequency gradient to obtain multiple frequency points of the first sound pressure level noise within the preset frequency range;

[0094] Analyze the sound pressure level noise corresponding to each of the frequency points, and determine the maximum sound pressure level noise among the various sound pressure level noises as the target sound pressure level noise.

[0095] In this embodiment, after obtaining the first sound pressure level noise of the test vehicle, the frequency distribution of the first sound pressure level noise is analyzed in detail using a spectrum analysis method. The first sound pressure level noise of the test vehicle is expanded according to a preset frequency gradient to obtain multiple frequency points of the sound pressure level noise within a preset frequency range. For example, if the preset frequency range is 1000Hz-5000Hz, the first sound pressure level noise can be expanded according to a preset frequency gradient of 2Hz to obtain 1002Hz, 1004Hz...4008Hz, 5000Hz.

[0096] Furthermore, the sound pressure level noise at each frequency point is analyzed, and the sound pressure level noise at each frequency point is calculated. Then, among all the analyzed sound pressure level noises at different frequencies, the maximum sound pressure level noise within the preset frequency range is selected and used as the target sound pressure level noise. This step focuses on the frequency components that have the greatest impact on the overall vehicle acoustic performance, ensuring the optimization direction is targeted.

[0097] In this embodiment, by using spectrum unfolding and stepwise frequency point analysis, the distribution characteristics of sound pressure level noise within the target frequency range can be fully understood. By selecting the maximum sound pressure level noise as the target value, resources can be concentrated on optimizing the frequency components that have the greatest impact on the overall vehicle acoustic performance, thus improving the effectiveness of noise control. Furthermore, the preset frequency range focuses on high-frequency or specific frequency ranges of noise that are sensitive to human hearing. Optimizing this portion of noise improves the in-vehicle acoustic environment and enhances the user's driving experience.

[0098] In one embodiment, after determining the target noise value of the target vehicle, the method further includes:

[0099] Based on the target noise value of the sound source, determine the target frequency of the target noise value of the sound source;

[0100] The constrained rotational speed of the motor of the target vehicle is determined based on the target frequency of the noise target value of the sound source.

[0101] In this embodiment, after determining the target noise value of the target vehicle, further analysis of the relationship between the target frequency and the motor speed provides guidance for powertrain optimization. The specific steps include the following:

[0102] Based on the determined target noise value of the sound source, analyze its spectral distribution and extract the target frequency corresponding to the target value. In practical applications, spectrum analysis tools can be used to identify the peak frequency point of the target noise value in the frequency domain, or select the key frequency point that has the greatest impact on the overall vehicle acoustic environment, thereby obtaining the target frequency corresponding to the target noise value of the sound source.

[0103] Furthermore, based on the relationship between frequency and rotational speed in acoustic theory, the motor speed corresponding to the target frequency is calculated and used as the constraint speed for motor design or control. Then, based on the calculated constraint speed, the constraint speed range of the motor under different operating conditions is determined to ensure that the noise from the source within the constraint speed range under the current operating conditions does not exceed the target noise value.

[0104] This embodiment further clarifies the specific motor performance parameters for noise source control by extracting the target frequency and determining the constrained rotational speed, making the target value more practically meaningful. Furthermore, after clarifying the constrained rotational speed range, it can guide motor designers to optimize rotational speed characteristics, avoid noise excitation at the target frequency, and improve motor efficiency and reliability. In addition, by combining acoustic targets with motor control strategies, the key noise frequencies perceived by the driver are reduced, improving the quietness and comfort of the in-vehicle environment. This method is applicable to various new energy vehicle models such as range-extended electric vehicles and pure electric vehicles, and can flexibly adjust the target frequency range and constraint conditions to adapt to diverse needs.

[0105] In one embodiment, determining the constraint speed of the motor of the target vehicle based on the target frequency of the sound source noise target value includes:

[0106] When the motor of the target vehicle is accelerating, obtain the number of teeth on the driving end of the first-stage reducer of the motor;

[0107] The constrained rotational speed is determined based on the target frequency of the noise source target value and the number of teeth at the active end of the first-stage reducer.

[0108] In this embodiment, the target frequency of the target noise value of the target vehicle's sound source, combined with the number of teeth of the reducer and the motor operating conditions, is used to deduce the constrained speed of the motor, providing a scientific basis for the noise control and optimization of the powertrain.

[0109] The number of teeth on the driving end of the reducer is a core parameter determining the relationship between motor speed and output frequency. Under the condition that the target vehicle's motor is accelerating, the number of teeth on the driving end of the first-stage reducer is recorded. Then, based on the relationship between frequency and speed, and given the target frequency of the noise source and the number of teeth on the driving end of the first-stage reducer, the relationship between frequency and speed is established. By deducing the constrained speed of the motor, where, The target frequency is the target value of the noise source. This refers to the motor speed; This refers to the number of teeth on the driving end of the first-stage reducer.

[0110] In one embodiment, determining the constraint speed of the motor of the target vehicle based on the target frequency of the sound source noise target value includes:

[0111] When the motor of the target vehicle is decelerating, the number of teeth on the driving end of the first-stage reducer of the motor, the number of teeth on the driven end of the first-stage reducer, and the number of teeth on the driving end of the second-stage reducer of the motor are obtained.

[0112] The constrained rotational speed is determined based on the target frequency of the noise source target value, the number of teeth at the active end of the first-stage reducer, the number of teeth at the passive end of the first-stage reducer, and the number of teeth at the active end of the second-stage reducer.

[0113] In this embodiment, by combining the target frequency of the noise target value of the sound source with the number of teeth in the multi-stage reducer, the constrained speed of the target vehicle motor is derived, providing an effective means for noise control under deceleration operation.

[0114] During vehicle motor deceleration, the noise frequency is closely related to the number of teeth in the reducer. Accurately obtaining the reducer tooth count is crucial for deriving the constraint speed. Under deceleration conditions, the number of teeth on the driving and driven ends of the first-stage reducer, as well as the number of teeth on the driving end of the second-stage reducer, are recorded. Then, based on the relationship between frequency and speed, and given the target frequency of the noise source, the number of teeth on the driving and driven ends of the first-stage reducer, and the number of teeth on the driving end of the second-stage reducer, the relationship between frequency and speed is used to derive the constraint speed. By deducing the constrained speed of the motor, where, The target frequency is the target value of the noise source. This refers to the motor speed; This refers to the number of teeth on the driving end of the first-stage reducer. This refers to the number of teeth on the driven end of the first-stage reducer. This refers to the number of teeth on the driving end of the two-stage reducer.

[0115] For example, this application provides a target table for setting vehicle sound source noise as shown in Table 1:

[0116]

[0117] Table 1

[0118] Table 1 shows the target noise levels for different sound sources under three different operating conditions, along with the corresponding constraint speeds for each target noise level. Specifically, under the WOT condition, a target noise level of 55 dB means the vehicle's sound source noise should be controlled at 55 dB or below when the speed is below 500 rpm; a target noise level of 61 dB means the vehicle's sound source noise should be controlled at 61 dB or below when the speed is between 500 rpm and 1000 rpm; and a target noise level of 67 dB means the vehicle's sound source noise should be controlled at 67 dB or below when the speed is between 1000 rpm and 2000 rpm. Under the POT condition, a target noise level of 30 dB means the vehicle's sound source noise should be controlled at 30 dB or below when the speed is below 500 rpm; and a target noise level of 49 dB means the vehicle's sound source noise should be controlled at 55 dB or below when the speed is below 500 rpm. Between 500 rpm and 1000 rpm, the vehicle's noise level should be controlled at 19 dB or below. If the target noise level is 53 dB, then between 1000 rpm and 2000 rpm, the vehicle's noise level should be controlled at 53 dB or below. Under CD operating conditions, if the target noise level is 30 dB, then between 500 rpm and 40 dB, the vehicle's noise level should be controlled at 40 dB or below between 500 rpm and 1000 rpm. If the target noise level is 55 dB, then between 1000 rpm and 2000 rpm, the vehicle's noise level should be controlled at 55 dB or below. In this application, the data shown in Table 1 are only partial examples and do not represent all the data to be described in this application.

[0119] In one embodiment, the method for determining the acoustic transmission function includes:

[0120] During the second bench test, the time-domain sound pressure level noise and the sound pressure level noise output by the signal source within the target area of ​​the vehicle are collected. The vehicle can be either the test vehicle or the target vehicle.

[0121] The time-domain sound pressure level noise is transformed in the frequency domain to obtain the frequency-domain sound pressure level noise;

[0122] The acoustic propagation function is calculated based on the sound pressure level noise output by the signal source and the frequency domain sound pressure level noise.

[0123] In this embodiment, the vehicle's acoustic transfer function is accurately determined through bench testing combined with frequency domain analysis, providing a scientific basis for setting noise targets. The specific steps are as follows:

[0124] During the second bench test, the following key data were collected for the target vehicle or test vehicle:

[0125] The time-domain sound pressure level noise of the target area and the sound pressure level noise output from the signal source are collected. For the time-domain sound pressure level noise of the target area, high-sensitivity microphones or acoustic sensors can be placed in the target area of ​​the target vehicle or test vehicle (e.g., the driver's head area, the right side of the middle row, or the right side of the third row) to collect the time-domain sound pressure level noise in the target area in real time. Similarly, high-sensitivity microphones or acoustic sensors can be used to collect the sound pressure level noise output from the signal source in real time.

[0126] Furthermore, the collected time-domain sound pressure level noise is transformed in the frequency domain to obtain the frequency-domain sound pressure level noise. In this application, Fourier transform can be used to convert the time-domain sound pressure level noise into the frequency-domain sound pressure level noise.

[0127] Furthermore, the acoustic transmission function is calculated based on the sound pressure level noise and frequency domain sound pressure level noise output by the signal source.

[0128] In one embodiment, a method such as Figure 2 The flowchart shown is a method for determining the target noise of the entire vehicle's sound sources. Figure 2 As shown:

[0129] S1: Determine the test vehicle: Based on the target vehicle, determine the test vehicle that is comparable to it.

[0130] S2: Collect the first sound pressure level noise of the test vehicle: Conduct the first bench test on the test vehicle and collect the first sound pressure level noise of the target area inside the vehicle under the target test conditions.

[0131] S3: Determine the first acoustic transfer function of the test vehicle: Conduct a second bench test on the test vehicle to determine the first acoustic transfer function of the test vehicle under the target test conditions.

[0132] S4: Determine the second acoustic transfer function of the target vehicle: Conduct a second bench test on the target vehicle to determine the second acoustic transfer function of the target vehicle under the target test conditions.

[0133] S5: Determine the first sound source noise of the test vehicle: Based on the first sound pressure level noise of the test vehicle obtained in S2 and the first sound transmission function obtained in S3, the first sound source noise of the test vehicle is calculated by reverse derivation.

[0134] S6: Determine the target sound pressure level noise: Based on the first sound pressure level noise of the test vehicle obtained in S2, the target sound pressure level noise is obtained through spectrum expansion.

[0135] S7: Determine the second sound source noise of the target vehicle: Based on the second sound transmission function obtained in S4 and the target sound pressure level noise obtained in S6, the second sound source noise of the target vehicle is calculated by reverse derivation.

[0136] S8: Collect the noise of the drive motor of the test vehicle: Conduct the first test on the test vehicle and collect the noise of the drive motor of the test vehicle under the target test conditions.

[0137] S9: Calculate the noise deviation value of the sound source: Based on the first sound source noise of the test vehicle obtained in S5 and the drive motor noise of the test vehicle obtained in S8, the noise deviation value of the sound source is calculated.

[0138] S10: Determine the target noise value of the sound source: Based on the second sound source noise of the target vehicle obtained in S7 and the sound source noise deviation value obtained in S9, the target noise value of the sound source is calculated.

[0139] This application provides a method for setting a target for vehicle sound source noise. The method includes: conducting a first bench test on a test vehicle to obtain a first sound pressure level noise of the test vehicle under a target test condition; conducting a second bench test on both the test vehicle and the target vehicle to determine a first acoustic transfer function of the test vehicle and a second acoustic transfer function of the target vehicle; performing spectral analysis on the first sound pressure level noise to determine a target sound pressure level noise within a preset frequency range; determining a first sound source noise of the test vehicle based on the first sound pressure level noise and the first acoustic transfer function; determining a second sound source noise of the target vehicle based on the target sound pressure level noise and the second acoustic transfer function; and determining a target value for the sound source noise of the target vehicle based on the first sound source noise and the second sound source noise. This application accurately sets the target value for the sound source noise of the target vehicle by calculating the acoustic transfer function and sound source noise of the test vehicle and the target vehicle, thereby effectively solving the problem of inconsistency between bench testing and actual vehicle performance, and improving the accuracy and rationality of sound source noise target setting.

[0140] Based on the same inventive concept, a second aspect of this application provides a system for targeting vehicle noise sources, such as... Figure 3 As shown, the system includes:

[0141] The first test module 201 is used to conduct a first bench test on the test vehicle and obtain the first sound pressure level noise of the test vehicle under the target test conditions.

[0142] The second test module 202 is used to conduct a second bench test on the test vehicle and the target vehicle respectively, and to determine the first acoustic transfer function of the test vehicle and the second acoustic transfer function of the target vehicle.

[0143] The spectrum analysis module 203 is used to perform spectrum analysis on the first sound pressure level noise and determine the target sound pressure level noise within a preset frequency range.

[0144] The first determining module 204 is used to determine the first sound source noise of the test vehicle based on the first sound pressure level noise and the first sound transfer function;

[0145] The second determining module 205 is used to determine the second sound source noise of the target vehicle based on the target sound pressure level noise and the second sound transfer function;

[0146] The third determining module 206 is used to determine the target noise value of the target vehicle based on the first noise source and the second noise source.

[0147] Optionally, the third determining module 206, which determines the target noise value of the target vehicle based on the first sound source noise and the second sound source noise, includes:

[0148] The first test submodule is used to conduct a first bench test on the test vehicle to obtain the drive motor noise of the test vehicle.

[0149] The first determining submodule is used to obtain the sound source noise deviation value based on the first sound source noise and the drive motor noise;

[0150] The second determining submodule is used to determine the target noise value of the target vehicle based on the second noise source and the noise source deviation value.

[0151] Optionally, the step of performing spectral analysis on the first sound pressure level noise to obtain the target sound pressure level noise within a preset frequency range, wherein the spectral analysis module 203 includes:

[0152] The spectrum expansion submodule is used to expand the spectrum of the first sound pressure level noise according to a preset frequency gradient to obtain multiple frequency points of the first sound pressure level noise within the preset frequency range.

[0153] The analysis submodule is used to analyze the sound pressure level noise corresponding to each of the frequency points, and to determine the maximum sound pressure level noise among the various sound pressure level noises as the target sound pressure level noise.

[0154] Optionally, the system further includes:

[0155] The third determining submodule is used to determine the target frequency of the sound source noise target value based on the sound source noise target value;

[0156] The fourth determining submodule is used to determine the constrained rotational speed of the motor of the target vehicle based on the target frequency of the sound source noise target value.

[0157] Optionally, the fourth determining submodule, which determines the constraint speed of the motor of the target vehicle based on the target frequency of the sound source noise target value, includes:

[0158] The first acquisition subunit is used to acquire the number of teeth at the driving end of the first-stage reducer of the target vehicle when the motor is accelerating.

[0159] The first determining subunit is used to determine the constrained rotational speed based on the target frequency of the sound source noise target value and the number of teeth at the active end of the first-stage reducer.

[0160] Optionally, the fourth determining submodule, which determines the constraint speed of the motor of the target vehicle based on the target frequency of the sound source noise target value, includes:

[0161] The second acquisition subunit is used to acquire the number of teeth at the driving end of the first-stage reducer of the motor, the number of teeth at the driven end of the first-stage reducer, and the number of teeth at the driving end of the second-stage reducer of the motor when the motor of the target vehicle is decelerating.

[0162] The second determining subunit is used to determine the constrained rotational speed based on the target frequency of the sound source noise target value, the number of teeth at the active end of the first-stage reducer, the number of teeth at the passive end of the first-stage reducer, and the number of teeth at the active end of the second-stage reducer.

[0163] Optionally, the system further includes:

[0164] The acquisition submodule is used to acquire the time-domain sound pressure level noise and the sound pressure level noise output by the signal source within the target area of ​​the vehicle during the second bench test. The vehicle is either the test vehicle or the target vehicle.

[0165] The frequency domain transformation submodule is used to perform frequency domain transformation on the time domain sound pressure level noise to obtain the frequency domain sound pressure level noise;

[0166] The calculation submodule is used to calculate the acoustic transmission function based on the sound pressure level noise output by the signal source and the frequency domain sound pressure level noise.

[0167] A third aspect of this application provides a method such as Figure 4 The electronic device 100 shown includes a memory 110, a processor 120, and a computer program stored on the memory 110. The processor 120 executes the computer program to implement the vehicle noise target setting method as described in the first aspect of this application.

[0168] In a fourth aspect, this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method for determining the target noise of a vehicle sound source as described in the first aspect of this application.

[0169] Each embodiment in this specification focuses on the differences from other embodiments. For the same or similar parts between the embodiments, please refer to each other.

[0170] Those skilled in the art will understand that embodiments of this application can be provided as methods, apparatus, or computer program products. Therefore, embodiments of this application can take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects. Furthermore, embodiments of this application can take the form of computer program products 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 code.

[0171] This application describes embodiments with reference to flowchart illustrations and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations 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, special-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0172] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0173] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal equipment, causing a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable terminal equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1The steps of the function specified in one or more boxes.

[0174] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0175] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0176] The above provides a detailed description of the method, system, device, and medium for determining the noise source of a vehicle. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method for determining the target noise of a vehicle's sound sources, characterized in that, The method includes: conducting a first bench test on the test vehicle to obtain the first sound pressure level noise of the test vehicle under the target test conditions; A second bench test was conducted on the test vehicle and the target vehicle respectively to determine the first acoustic transfer function of the test vehicle and the second acoustic transfer function of the target vehicle. Spectral analysis is performed on the first sound pressure level noise to determine the target sound pressure level noise within a preset frequency range; The first sound source noise of the test vehicle is determined based on the first sound pressure level noise and the first sound transfer function; The second sound source noise of the target vehicle is determined based on the target sound pressure level noise and the second sound transfer function; The target noise value of the target vehicle is determined based on the first noise source and the second noise source.

2. The method for determining the target noise of a vehicle sound source according to claim 1, characterized in that, Determining the target noise value of the target vehicle based on the first noise source and the second noise source includes: The first bench test was conducted on the test vehicle to obtain the noise of the drive motor of the test vehicle; The noise deviation value of the sound source is obtained based on the noise of the first sound source and the noise of the drive motor; The target noise value of the target vehicle is determined based on the second noise source and the noise source deviation value.

3. The method for determining the target noise of a vehicle sound source according to claim 1, characterized in that, The step of performing spectral analysis on the first sound pressure level noise to obtain the target sound pressure level noise within a preset frequency range includes: The first sound pressure level noise is subjected to spectral expansion according to a preset frequency gradient to obtain multiple frequency points of the first sound pressure level noise within the preset frequency range; Analyze the sound pressure level noise corresponding to each of the frequency points, and determine the maximum sound pressure level noise among the various sound pressure level noises as the target sound pressure level noise.

4. The method for determining the target noise of a vehicle sound source according to claim 1, characterized in that, After determining the target noise value of the target vehicle's sound source, the method further includes: Based on the target noise value of the sound source, determine the target frequency of the target noise value of the sound source; The constrained rotational speed of the motor of the target vehicle is determined based on the target frequency of the noise target value of the sound source.

5. The method for determining the target noise of a vehicle sound source according to claim 4, characterized in that, Determining the constraint speed of the motor of the target vehicle based on the target frequency of the target noise value of the sound source includes: When the motor of the target vehicle is accelerating, obtain the number of teeth on the driving end of the first-stage reducer of the motor; The constrained rotational speed is determined based on the target frequency of the noise source target value and the number of teeth at the active end of the first-stage reducer.

6. The method for determining the target noise of a vehicle sound source according to claim 4, characterized in that, Determining the constraint speed of the motor of the target vehicle based on the target frequency of the target noise value of the sound source includes: When the motor of the target vehicle is decelerating, the number of teeth on the driving end of the first-stage reducer of the motor, the number of teeth on the driven end of the first-stage reducer, and the number of teeth on the driving end of the second-stage reducer of the motor are obtained. The constrained rotational speed is determined based on the target frequency of the noise source target value, the number of teeth at the active end of the first-stage reducer, the number of teeth at the passive end of the first-stage reducer, and the number of teeth at the active end of the second-stage reducer.

7. The method for determining the target noise of a vehicle sound source according to claim 1, characterized in that, Methods for determining the acoustic transfer function include: During the second bench test, the time-domain sound pressure level noise and the sound pressure level noise output by the signal source within the target area of ​​the vehicle are collected. The vehicle can be either the test vehicle or the target vehicle. The time-domain sound pressure level noise is transformed in the frequency domain to obtain the frequency-domain sound pressure level noise; The acoustic propagation function is calculated based on the sound pressure level noise output by the signal source and the frequency domain sound pressure level noise.

8. A target determination system for vehicle sound source noise, characterized in that, The system includes: The first test module is used to conduct the first bench test on the test vehicle and obtain the first sound pressure level noise of the test vehicle under the target test conditions. The second test module is used to conduct a second bench test on the test vehicle and the target vehicle respectively, and to determine the first acoustic transfer function of the test vehicle and the second acoustic transfer function of the target vehicle. The spectrum analysis module is used to perform spectrum analysis on the first sound pressure level noise and determine the target sound pressure level noise within a preset frequency range. The first determining module is used to determine the first sound source noise of the test vehicle based on the first sound pressure level noise and the first sound transfer function; The second determining module is used to determine the second sound source noise of the target vehicle based on the target sound pressure level noise and the second sound transfer function; The third determining module is used to determine the target noise value of the target vehicle based on the first noise source and the second noise source.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory, characterized in that, The processor executes the computer program to implement the method for determining the target noise of a vehicle sound source as described in any one of claims 1-7.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by the processor, it implements the method for determining the target noise of the vehicle sound source as described in any one of claims 1-7.

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