Target formulating method, system and equipment for sound source noise of whole vehicle and medium

Abstract

The invention provides a target formulating method, system and equipment for sound source noise of a whole vehicle and a medium, and relates to the technical field of NVH (Noise Vibration and Harshness), and the method comprises the steps: firstly, obtaining sound pressure level noise data of a test vehicle under a target working condition through a first bench test; respectively determining sound transmission functions of the test vehicle and the target vehicle through a second bench test; performing spectral analysis on the sound pressure level noise of the tested vehicle to obtain target sound pressure level noise in a specific frequency range; calculating the sound source noise of the test vehicle by combining the sound pressure level noise and the sound transfer function of the test vehicle; further determining sound source noise of the target vehicle by using the target sound pressure level noise and a sound transmission function of the target vehicle; and finally, according to the sound source noise of the test vehicle and the target vehicle, a sound source noise target value of the target vehicle is formulated. According to the invention, the problem that the bench test is inconsistent with the actual performance of the whole vehicle can be effectively solved, and the accuracy and rationality of sound source noise target formulation are improved.

Description

Technical Field

[0001] The present application relates to the field of automotive NVH technology, and in particular to a method, system, device and medium for setting a target for the sound source noise of a whole vehicle. Background Art

[0002] With the rapid development of new energy vehicles, many automakers are developing new energy vehicles based on existing fuel vehicle platforms. This development model usually achieves power conversion of new energy vehicles by replacing the powertrain and its matching system. However, since the body chassis structure is consistent with that of fuel vehicles, the noise problem is particularly prominent in the development of new energy powertrains.

[0003] At present, the industry usually uses sound pressure level or sound power indicators to evaluate powertrain noise, for example, setting the noise level below 30dB. However, due to the particularity of powertrain noise in new energy vehicles, such indicators are difficult to truly reflect the actual performance in the state of the whole vehicle. Through subjective evaluation and objective testing at the whole vehicle level, it is found that the existing powertrain noise often does not meet expectations in the state of the whole vehicle.

[0004] Therefore, a new method for setting targets for vehicle source noise is urgently needed. Summary of the invention

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

[0006] In a first aspect of the present application, a method for setting a target for vehicle source noise is provided, the method comprising: Performing a first bench test on the test vehicle to obtain a first sound pressure level noise of the test vehicle under a target test condition; Performing a second bench test on the test vehicle and the target vehicle respectively to determine a first sound transfer function of the test vehicle and a second sound transfer function of the target vehicle; Performing a spectrum analysis on the first sound pressure level noise to determine a target sound pressure level noise of the first sound pressure level noise within a preset frequency range; determining a first sound source noise of the test vehicle according to the first sound pressure level noise and the first sound transfer function; Determining a second sound source noise of the target vehicle according to the target sound pressure level noise and the second sound transfer function; A target sound source noise value of the target vehicle is determined according to the first sound source noise and the second sound source noise.

[0007] Optionally, determining a target value of the sound source noise of the target vehicle according to the first sound source noise and the second sound source noise includes: Performing a first bench test on the test vehicle to obtain a driving motor noise of the test vehicle; Obtaining a sound source noise deviation value according to the first sound source noise and the driving motor noise; A target sound source noise value of the target vehicle is determined according to the second sound source noise and the sound source noise deviation value.

[0008] Optionally, performing spectrum analysis on the first sound pressure level noise to obtain a target sound pressure level noise of the first sound pressure level noise within a preset frequency range includes: Expanding the frequency spectrum of the first sound pressure level noise according to a preset frequency gradient to obtain a plurality of frequency points of the first sound pressure level noise within the preset frequency range; The sound pressure level noise corresponding to each of the frequency points is analyzed, and the maximum sound pressure level noise among the sound pressure level noises is determined as the target sound pressure level noise.

[0009] Optionally, after determining the target value of the sound source noise of the target vehicle, the method further includes: Determining a target frequency of the sound source noise target value according to the sound source noise target value; The restricted rotation speed of the motor of the target vehicle is determined according to the target frequency of the sound source noise target value.

[0010] Optionally, determining the constrained speed of the motor of the target vehicle according to the target frequency of the sound source noise target value includes: When the motor of the target vehicle is in acceleration operation, obtaining the number of teeth at the active end of the primary reducer of the motor; The constrained rotational speed is determined according to the target frequency of the sound source noise target value and the number of teeth at the active end of the primary reducer.

[0011] Optionally, determining the constrained speed of the motor of the target vehicle according to the target frequency of the sound source noise target value includes: When the motor of the target vehicle is in deceleration operation, the number of teeth at the active end of the primary reducer of the motor, the number of teeth at the passive end of the primary reducer, and the number of teeth at the active end of the secondary reducer of the motor are obtained; The constrained speed is determined according to the target frequency of the sound source noise target value, the number of teeth at the active end of the primary reducer, the number of teeth at the passive end of the primary reducer, and the number of teeth at the active end of the secondary reducer.

[0012] Optionally, the method for determining the sound transmission function includes: During the second bench test, collecting the time domain sound pressure level noise in the target area of ​​the vehicle and the sound pressure level noise output by the signal source, the vehicle being either the test vehicle or the target vehicle; Transforming the time domain sound pressure level noise into the frequency domain to obtain the frequency domain sound pressure level noise; The sound transmission function is calculated based on the sound pressure level noise output by the signal source and the frequency domain sound pressure level noise.

[0013] In a second aspect of the present application, a system for setting a target for vehicle source noise is provided, the system comprising: A first test module is used to perform a first bench test on the test vehicle to obtain a first sound pressure level noise of the test vehicle under a target test condition; A second test module is used to perform a second bench test on the test vehicle and the target vehicle respectively to determine a first sound transmission function of the test vehicle and a second sound transmission function of the target vehicle; a spectrum analysis module, configured to perform spectrum analysis on the first sound pressure level noise to determine a target sound pressure level noise of the first sound pressure level noise within a preset frequency range; A first determination module, configured to determine a first sound source noise of the test vehicle according to the first sound pressure level noise and the first sound transfer function; A second determination module, configured to determine a second sound source noise of the target vehicle according to the target sound pressure level noise and the second sound transfer function; The third determination module is used to determine a target value of the sound source noise of the target vehicle according to the first sound source noise and the second sound source noise.

[0014] Optionally, the target value of the sound source noise of the target vehicle is determined according to the first sound source noise and the second sound source noise, and the third determination module includes: A first test submodule, used for performing a first bench test on the test vehicle to obtain the driving motor noise of the test vehicle; A first determination submodule, configured to obtain a sound source noise deviation value according to the first sound source noise and the driving motor noise; The second determination submodule is used to determine the target value of the sound source noise of the target vehicle according to the second sound source noise and the sound source noise deviation value.

[0015] Optionally, the performing spectrum analysis on the first sound pressure level noise to obtain a target sound pressure level noise of the first sound pressure level noise within a preset frequency range, the spectrum analysis module includes: a spectrum expansion submodule, configured to perform spectrum expansion on the first sound pressure level noise according to a preset frequency gradient to obtain a plurality of frequency points of the first sound pressure level noise within the preset frequency range; The analysis submodule is used to analyze the sound pressure level noise corresponding to each of the frequency points, and determine the maximum sound pressure level noise among the sound pressure level noises as the target sound pressure level noise.

[0016] Optionally, the system further comprises: A third determination submodule is used to determine a target frequency of the sound source noise target value according to the sound source noise target value; The fourth determination submodule is used to determine the constrained speed of the motor of the target vehicle according to the target frequency of the sound source noise target value.

[0017] Optionally, the constrained speed of the motor of the target vehicle is determined according to the target frequency of the sound source noise target value, and the fourth determination submodule includes: A first acquisition subunit is used to acquire the number of teeth at the active end of the primary reducer of the motor when the motor of the target vehicle is in acceleration operation; The first determination subunit is used to determine the constrained speed according to the target frequency of the sound source noise target value and the number of teeth at the active end of the primary reducer.

[0018] Optionally, the constrained speed of the motor of the target vehicle is determined according to the target frequency of the sound source noise target value, and the fourth determination submodule includes: A second acquisition subunit is used to acquire the number of teeth at the active end of the primary reducer of the motor, the number of teeth at the passive end of the primary reducer, and the number of teeth at the active end of the secondary reducer of the motor when the motor of the target vehicle is in deceleration operation; The second determination subunit is used to determine the constrained speed according to the target frequency of the sound source noise target value and the number of teeth at the active end of the first reducer, the number of teeth at the passive end of the first reducer, and the number of teeth at the active end of the second reducer.

[0019] Optionally, the system further comprises: A collection submodule, used for collecting the time domain sound pressure level noise in the target area of ​​the vehicle and the sound pressure level noise output by the signal source during the second bench test, wherein the vehicle is any one of the test vehicle and the target vehicle; A frequency domain transformation submodule, used for transforming the time domain sound pressure level noise into a frequency domain to obtain a frequency domain sound pressure level noise; The calculation submodule is used to calculate the sound transmission function according to the sound pressure level noise output by the signal source and the frequency domain sound pressure level noise.

[0020] In a third aspect of the present application, an electronic device is provided, comprising a memory, a processor, and a computer program stored on the memory, wherein the processor executes the computer program to implement the target setting method for the whole vehicle sound source noise as described in the first aspect of the present application.

[0021] In a fourth aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the target setting method for the whole vehicle sound source noise as described in the first aspect of the present application is implemented.

[0022] Beneficial effects of this application: The present application provides a method for setting a target for the sound source noise of a whole vehicle, the method comprising: performing 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; performing a second bench test on the test vehicle and the target vehicle respectively to determine a first sound transmission function of the test vehicle and a second sound transmission function of the target vehicle; performing a spectrum analysis on the first sound pressure level noise to determine a target sound pressure level noise of the first sound pressure level noise within a preset frequency range; determining the first sound source noise of the test vehicle according to the first sound pressure level noise and the first sound transmission function; determining the second sound source noise of the target vehicle according to the target sound pressure level noise and the second sound transmission function; determining the target value of the sound source noise of the target vehicle according to the first sound source noise and the second sound source noise. The present application accurately sets the target value of the sound source noise of the target vehicle by calculating the sound transmission function and the sound source noise of the test vehicle and the target vehicle, thereby effectively solving the problem of inconsistency between the bench test and the actual performance of the whole vehicle, and improving the accuracy and rationality of the sound source noise target setting. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the steps of a method for setting a target for vehicle sound source noise provided by an embodiment of the present application; Figure 2 It is a flowchart of a method for setting a target for vehicle source noise provided by an embodiment of the present application; Figure 3 It is a schematic diagram of a target setting system for vehicle sound source noise provided in an embodiment of the present application; Figure 4 It is a schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] The exemplary embodiments of the present application will be described in more detail below in conjunction with the accompanying drawings in the embodiments of the present application. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present application and to enable the scope of the present application to be fully communicated to those skilled in the art.

[0026] Based on the above problems, in a first aspect of the embodiments of the present application, a method for setting a target for the sound source noise of a vehicle is provided. Figure 1 As shown, including: Step S101 : performing 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.

[0027] In this step, the first bench test is performed on the test vehicle under the target test condition, and the first sound pressure level noise of the test vehicle under the target test condition is recorded. In this application, the target test condition can be a full throttle (WOT) condition, a half throttle (POT) condition, and a deceleration (CD) condition, 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 meet the standard specifications to ensure the accuracy of the data. In this application, the in-vehicle noise receiving points can be the main 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 a bench test of the vehicle on a lifting bench in the anechoic chamber.

[0028] Step S102 : performing a second bench test on the test vehicle and the target vehicle respectively to determine a first sound transmission function of the test vehicle and a second sound transmission function of the target vehicle.

[0029] In this step, a second bench test is performed on the test vehicle and the target vehicle respectively, and the sound transfer characteristics of the test vehicle and the target vehicle from the sound source to the noise receiving point in the vehicle (such as the driver's head) are measured respectively to obtain the first sound transfer function of the test vehicle and the second sound transfer function of the target vehicle. The sound transfer function is ATF (Acoustic Transfer Function), which reflects the sound propagation path and its attenuation characteristics under different vehicle acoustic environments. It is an important basis for inferring the sound source noise from the sound pressure level noise. In this application, the target vehicle is the basic R&D prototype vehicle, and the test vehicle is a competitive vehicle corresponding to the R&D prototype vehicle. The second bench test can be a bench test of the vehicle on a lifting bench in a semi-extinguishing chamber.

[0030] Step S103: performing spectrum analysis on the first sound pressure level noise to determine a target sound pressure level noise of the first sound pressure level noise within a preset frequency range.

[0031] In this step, the first sound pressure level noise of the test vehicle is subjected to spectrum analysis to screen out the target sound pressure level noise within the preset frequency range. In this application, the preset spectrum range selects the frequency band 1000Hz-5000Hz to which the human ear is most sensitive, so as to better focus on the frequency components that have a greater impact on the human ear and ensure that the formulation of the target value is more targeted and meaningful.

[0032] Step S104: determining a first sound source noise of the test vehicle according to the first sound pressure level noise and the first sound transfer function.

[0033] 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 deduction. Specifically, based on the theory of corresponding point = excitation source * sound transfer function, the first sound source noise = first sound pressure level noise / first sound transfer function can be reversely solved.

[0034] Step S105 : determining the second sound source noise of the target vehicle according to the target sound pressure level noise and the second sound transfer function.

[0035] 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 transmission function of the target vehicle through reverse acoustic derivation. Similarly, based on the theory of corresponding point = excitation source * sound transmission function, the second sound source noise = target sound pressure level noise / second sound transmission function can be reversely solved.

[0036] Step S106: determining a target sound source noise value of the target vehicle according to the first sound source noise and the second sound source noise.

[0037] In this step, the target value of the sound source noise of the target vehicle is determined based on the first sound source noise of the test vehicle and the second sound source noise of the target vehicle in combination with the acoustic design objectives of the entire vehicle.

[0038] This application calculates the sound transmission function and sound source noise of the test vehicle and the target vehicle, and accurately formulates the sound source noise target value of the target vehicle, thereby effectively solving the problem of inconsistency between the bench test and the actual performance of the whole vehicle, and improving the accuracy and rationality of sound source noise target formulation.

[0039] In one embodiment, determining the target value of the sound source noise of the target vehicle according to the first sound source noise and the second sound source noise includes: Performing a first bench test on the test vehicle to obtain a driving motor noise of the test vehicle; Obtaining a sound source noise deviation value according to the first sound source noise and the driving motor noise; A target sound source noise value of the target vehicle is determined according to the second sound source noise and the sound source noise deviation value.

[0040] In this embodiment, the first bench test is carried out on the test vehicle to collect the drive motor noise of the test vehicle under specific working conditions, that is, the motor noise characteristics of the powertrain near field. This step ensures that the drive motor is analyzed separately as the main source of vehicle noise, so as to improve the pertinence of the noise target value setting.

[0041] Furthermore, the deviation between the first sound source noise and the driving motor noise of the test vehicle is calculated, which reflects the acoustic impact of the driving motor noise in the process of propagating through the acoustic path to the noise receiving point in the vehicle, and the acoustic impact of the non-motor noise of the test vehicle on the sound source noise of the whole vehicle.

[0042] Furthermore, the target value of the target vehicle's sound source noise is determined based on the second sound source noise of the target vehicle and the calculated sound source noise deviation value. By introducing the deviation value into the noise of the target vehicle, its acoustic characteristics in the actual use environment can be more accurately reflected, and a reasonable sound source noise optimization target can be formulated.

[0043] In this embodiment, by introducing the drive motor noise as a key variable and calculating the sound source noise deviation value, the actual noise performance of the vehicle powertrain can be more comprehensively reflected. By analyzing the relationship between the drive motor noise and the sound source noise, the role of the motor noise in the acoustic performance of the whole vehicle is clarified, which helps to optimize the design of the motor and its surroundings. In addition, based on scientific deviation calculations, the number of tests and iterations is reduced, providing a clear acoustic optimization direction for the target vehicle and improving development efficiency.

[0044] In one embodiment, performing spectrum analysis on the first sound pressure level noise to obtain a target sound pressure level noise of the first sound pressure level noise within a preset frequency range includes: Expanding the frequency spectrum of the first sound pressure level noise according to a preset frequency gradient to obtain a plurality of frequency points of the first sound pressure level noise within the preset frequency range; The sound pressure level noise corresponding to each of the frequency points is analyzed, and the maximum sound pressure level noise among the sound pressure level noises is determined as the target sound pressure level noise.

[0045] 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 by a spectrum analysis method, and the first sound pressure level noise of the test vehicle is spectrum expanded according to a preset frequency gradient to obtain a plurality of frequency points of the sound pressure level noise within a preset frequency range. For example, if the preset frequency range is 1000 Hz-5000 Hz, the first sound pressure level noise can be expanded according to a preset frequency gradient of 2 Hz to obtain 1002 Hz, 1004 Hz...4008 Hz, 5000 Hz.

[0046] Furthermore, the sound pressure level noise corresponding to each frequency point is analyzed, the sound pressure level noise of each frequency point is calculated, and the maximum sound pressure level noise within the preset frequency range is selected from all the analyzed frequency point sound pressure level noises, and it is used as the target sound pressure level noise. This step focuses on the frequency component that has the greatest impact on the acoustic performance of the vehicle to ensure the targeted optimization direction.

[0047] In this embodiment, by expanding the spectrum and gradually analyzing the frequency points, the distribution characteristics of the sound pressure level noise within the target frequency range can be fully understood, and the maximum sound pressure level noise can be selected as the target value, so that resources can be concentrated on optimizing the frequency components that have the greatest impact on the acoustic performance of the vehicle, thereby improving the effectiveness of noise control. In addition, the preset frequency range focuses on high-frequency or specific frequency range noise that the human ear is sensitive to, and by optimizing this part of the noise, the acoustic environment in the car is improved, thereby enhancing the user's driving experience.

[0048] In one embodiment, after determining the target value of the sound source noise of the target vehicle, the method further includes: Determining a target frequency of the sound source noise target value according to the sound source noise target value; The restricted rotation speed of the motor of the target vehicle is determined according to the target frequency of the sound source noise target value.

[0049] In this embodiment, after determining the target value of the sound source noise of the target vehicle, guidance is provided for powertrain optimization by further analyzing the relationship between the target frequency and the motor speed. The specific steps include the following: According to the determined target value of the sound source noise, its spectrum distribution is analyzed and the target frequency corresponding to the target value is extracted. In practical applications, the spectrum analysis tool can be used to identify the peak frequency point of the sound source noise target value in the frequency domain, or to select the key frequency point that has the greatest impact on the acoustic environment of the entire vehicle, so as to obtain the target frequency corresponding to the target value of the sound source noise.

[0050] Furthermore, based on the relationship between frequency and speed in acoustic theory, the motor speed corresponding to the target frequency is calculated and used as the constrained speed for motor design or control. Then, based on the calculated constrained speed, the constrained speed range of the motor under different operating conditions is clarified to ensure that the sound source noise of the vehicle within the constrained speed range under the current operating conditions does not exceed the sound source noise target value.

[0051] This embodiment further clarifies the specific motor performance parameters of the sound source noise control by extracting the target frequency and determining the constrained speed, making the target value more meaningful for practical operation. Moreover, after clarifying the constrained speed range, it can guide motor designers to optimize the speed characteristics and avoid noise excitation at the target frequency, while improving the motor efficiency and reliability. In addition, the acoustic target is combined with the motor control strategy to reduce the key noise frequency perceived by the driver and improve the quietness and comfort of the vehicle interior environment. This method is applicable to a variety of new energy vehicle models such as extended-range electric vehicles and pure electric vehicles, and can flexibly adjust the target frequency range and constraints to meet diverse needs.

[0052] In one embodiment, determining the constrained speed of the motor of the target vehicle according to the target frequency of the sound source noise target value includes: When the motor of the target vehicle is in acceleration operation, obtaining the number of teeth at the active end of the primary reducer of the motor; The constrained rotational speed is determined according to the target frequency of the sound source noise target value and the number of teeth at the active end of the primary reducer.

[0053] In this embodiment, the constrained speed of the motor is deduced through the target frequency of the target value of the sound source noise of the target vehicle, combined with the number of reducer teeth and the motor operating conditions, providing a scientific basis for noise control and optimization of the powertrain.

[0054] The number of teeth on the active end of the reducer is the core parameter that determines the relationship between the motor speed and the output frequency. When the motor of the target vehicle is in the accelerated running condition, the number of teeth on the active end of the primary reducer is recorded. Then, based on the relationship between frequency and speed, after the target frequency of the target value of the sound source noise and the number of teeth on the active end of the primary reducer are known, the relationship between frequency and speed is calculated. Inversely deduce the motor's constrained speed, where The target frequency is the target value of the sound source noise; is the motor speed; is the number of teeth at the driving end of the primary reducer.

[0055] In one embodiment, determining the constrained speed of the motor of the target vehicle according to the target frequency of the sound source noise target value includes: When the motor of the target vehicle is in deceleration operation, the number of teeth at the active end of the primary reducer of the motor, the number of teeth at the passive end of the primary reducer, and the number of teeth at the active end of the secondary reducer of the motor are obtained; The constrained speed is determined according to the target frequency of the sound source noise target value, the number of teeth at the active end of the primary reducer, the number of teeth at the passive end of the primary reducer, and the number of teeth at the active end of the secondary reducer.

[0056] In this embodiment, by combining the relationship between the target frequency of the sound source noise target value and the number of multi-stage teeth of the reducer, the constrained speed of the target vehicle motor is derived, providing an effective means for noise control under deceleration operating conditions.

[0057] When the vehicle motor is decelerating, the noise frequency is closely related to the number of teeth on the reducer. Accurately obtaining the number of teeth on the reducer is the key to deriving the constrained speed. Under the deceleration condition, record the number of teeth on the active end and the passive end of the first-stage reducer, as well as the number of teeth on the active end of the second-stage reducer. Then, based on the relationship between frequency and speed, when the target frequency of the target value of the sound source noise, the number of teeth on the active end and the passive end of the first-stage reducer, and the number of teeth on the active end of the second-stage reducer are known, the relationship between frequency and speed is used. Inversely deduce the motor's constrained speed, where The target frequency is the target value of the sound source noise; is the motor speed; is the number of teeth at the driving end of the primary reducer; is the number of teeth at the passive end of the primary reducer; is the number of teeth on the active end of the secondary reducer.

[0058] Exemplarily, the present application provides a vehicle source noise target setting table as shown in Table 1:

[0059] Table 1 As shown in Table 1, different sound source noise target values ​​under three different working conditions and the constrained speeds corresponding to each sound source noise target value are shown respectively. Among them, under the WOT working condition, the sound source noise target value is 55db, then when the speed is below 500rpm, the sound source noise of the vehicle should be controlled at or below 55db, the sound source noise target value is 61db, then when the speed is between 500rpm-1000rpm, the sound source noise of the vehicle should be controlled at or below 61db, the sound source noise target value is 67db, then when the speed is between 1000rpm-2000rpm, the sound source noise of the vehicle should be controlled at or below 67db; under the POT working condition, the sound source noise target value is 30db, then when the speed is below 500rpm, the sound source noise of the vehicle should be controlled at or below 30db, the sound source noise target value is 49db, then when the speed is between When the speed is between 500rpm-1000rpm, the sound source noise of the vehicle should be controlled at 19db or below, and the target value of the sound source noise is 53db. When the speed is between 1000rpm-2000rpm, the sound source noise of the vehicle should be controlled at 53db or below; under CD conditions, the target value of the sound source noise is 30db, then when the speed is below 500rpm, the sound source noise of the vehicle should be controlled at 30db or below, the target value of the sound source noise is 40db, then when the speed is between 500rpm-1000rpm, the sound source noise of the vehicle should be controlled at 40db or below, the target value of the sound source noise is 55db, then when the speed is between 1000rpm-2000rpm, the sound source noise of the vehicle should be controlled at 55db or below. In this application, the data shown in Table 1 are only some examples, and not all the data to be described in this application.

[0060] In one embodiment, the method for determining the sound transmission function includes: During the second bench test, collecting the time domain sound pressure level noise in the target area of ​​the vehicle and the sound pressure level noise output by the signal source, the vehicle being either the test vehicle or the target vehicle; Transforming the time domain sound pressure level noise into the frequency domain to obtain the frequency domain sound pressure level noise; The sound transmission function is calculated based on the sound pressure level noise output by the signal source and the frequency domain sound pressure level noise.

[0061] In this embodiment, the vehicle sound transmission function is accurately determined by combining bench testing with frequency domain analysis to provide a scientific basis for noise target formulation. The specific steps are as follows: During the second bench test, the following key data are collected for the target vehicle or test vehicle: The time-domain sound pressure level noise of the target area and the sound pressure level noise output by the signal source. For the time-domain sound pressure level noise of the target area, a high-sensitivity microphone or acoustic sensor can be placed in the target area of ​​the target vehicle or test vehicle (such as the driver's head, the right side of the middle row or the right side of the third row, etc.) to collect the time-domain sound pressure level noise of the target area in real time. For the sound pressure level noise output by the signal source, a high-sensitivity microphone or acoustic sensor can also be used for real-time collection.

[0062] Furthermore, the collected time-domain sound pressure level noise is transformed into the frequency-domain to obtain the frequency-domain sound pressure level noise. In the present application, Fourier transform can be used to convert the time-domain sound pressure level noise into the frequency-domain sound pressure level noise.

[0063] Furthermore, the sound transmission function is calculated based on the sound pressure level noise and the frequency domain sound pressure level noise output by the signal source.

[0064] In one embodiment, there is provided a Figure 2 The flowchart of the target setting method for the vehicle source noise is shown in FIG. Figure 2 As shown: S1: Determine a test vehicle: Determine a test vehicle to be compared with the target vehicle based on the target vehicle.

[0065] S2: Collecting the first sound pressure level noise of the test vehicle: Conducting the first bench test on the test vehicle to collect the first sound pressure level noise of the target area inside the vehicle under the target test conditions.

[0066] S3: Determine a first sound transmission function of the test vehicle: Perform a second bench test on the test vehicle to determine a first sound transmission function of the test vehicle under a target test condition.

[0067] S4: Determine a second sound transmission function of the target vehicle: Perform a second bench test on the target vehicle to determine a second sound transmission function of the target vehicle under the target test conditions.

[0068] 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 obtained by reverse deduction and calculation.

[0069] 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 by spectrum expansion.

[0070] S7: Determine the second sound source noise of the target vehicle: Based on the second sound transfer function obtained in S4 and the target sound pressure level noise obtained in S6, the second sound source noise of the target vehicle is obtained by reverse deduction and calculation.

[0071] S8: Collecting the driving motor noise of the test vehicle: Performing the first bench test on the test vehicle to collect the driving motor noise of the test vehicle under the target test conditions.

[0072] S9: Calculating the sound source noise deviation value: Based on the first sound source noise of the test vehicle obtained in S5 and the driving motor noise of the test vehicle obtained in S8, the sound source noise deviation value is calculated.

[0073] S10: Determine the target value of the sound source noise: Based on the second sound source noise of the target vehicle obtained in S7 and the sound source noise deviation value obtained in S9, calculate and obtain the target value of the sound source noise.

[0074] The present application provides a method for setting a target for the sound source noise of a whole vehicle, the method comprising: performing 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; performing a second bench test on the test vehicle and the target vehicle respectively to determine a first sound transmission function of the test vehicle and a second sound transmission function of the target vehicle; performing a spectrum analysis on the first sound pressure level noise to determine a target sound pressure level noise of the first sound pressure level noise within a preset frequency range; determining the first sound source noise of the test vehicle according to the first sound pressure level noise and the first sound transmission function; determining the second sound source noise of the target vehicle according to the target sound pressure level noise and the second sound transmission function; determining the target value of the sound source noise of the target vehicle according to the first sound source noise and the second sound source noise. The present application accurately sets the target value of the sound source noise of the target vehicle by calculating the sound transmission function and the sound source noise of the test vehicle and the target vehicle, thereby effectively solving the problem of inconsistency between the bench test and the actual performance of the whole vehicle, and improving the accuracy and rationality of the sound source noise target setting.

[0075] Based on the same inventive concept, the second aspect of the present application provides a target setting system for vehicle sound source noise, such as Figure 3 As shown, the system comprises: The first test module 201 is used to perform a first bench test on the test vehicle to obtain a first sound pressure level noise of the test vehicle under a target test condition; A second test module 202 is used to perform a second bench test on the test vehicle and the target vehicle respectively to determine a first sound transfer function of the test vehicle and a second sound transfer function of the target vehicle; A spectrum analysis module 203 is used to perform spectrum analysis on the first sound pressure level noise to determine a target sound pressure level noise of the first sound pressure level noise within a preset frequency range; A first determination module 204 is used to determine a first sound source noise of the test vehicle according to the first sound pressure level noise and the first sound transfer function; A second determination module 205 is used to determine a second sound source noise of the target vehicle according to the target sound pressure level noise and the second sound transfer function; The third determination module 206 is configured to determine a target value of the sound source noise of the target vehicle according to the first sound source noise and the second sound source noise.

[0076] Optionally, the target value of the sound source noise of the target vehicle is determined according to the first sound source noise and the second sound source noise, and the third determination module 206 includes: A first test submodule, used for performing a first bench test on the test vehicle to obtain the driving motor noise of the test vehicle; A first determination submodule, configured to obtain a sound source noise deviation value according to the first sound source noise and the driving motor noise; The second determination submodule is used to determine the target value of the sound source noise of the target vehicle according to the second sound source noise and the sound source noise deviation value.

[0077] Optionally, the spectrum analysis is performed on the first sound pressure level noise to obtain a target sound pressure level noise of the first sound pressure level noise within a preset frequency range, and the spectrum analysis module 203 includes: a spectrum expansion submodule, configured to perform spectrum expansion on the first sound pressure level noise according to a preset frequency gradient to obtain a plurality of frequency points of the first sound pressure level noise within the preset frequency range; The analysis submodule is used to analyze the sound pressure level noise corresponding to each of the frequency points, and determine the maximum sound pressure level noise among the sound pressure level noises as the target sound pressure level noise.

[0078] Optionally, the system further comprises: A third determination submodule is used to determine a target frequency of the sound source noise target value according to the sound source noise target value; The fourth determination submodule is used to determine the constrained speed of the motor of the target vehicle according to the target frequency of the sound source noise target value.

[0079] Optionally, the constrained speed of the motor of the target vehicle is determined according to the target frequency of the sound source noise target value, and the fourth determination submodule includes: A first acquisition subunit is used to acquire the number of teeth at the active end of the primary reducer of the motor when the motor of the target vehicle is in acceleration operation; The first determination subunit is used to determine the constrained speed according to the target frequency of the sound source noise target value and the number of teeth at the active end of the primary reducer.

[0080] Optionally, the constrained speed of the motor of the target vehicle is determined according to the target frequency of the sound source noise target value, and the fourth determination submodule includes: A second acquisition subunit is used to acquire the number of teeth at the active end of the primary reducer of the motor, the number of teeth at the passive end of the primary reducer, and the number of teeth at the active end of the secondary reducer of the motor when the motor of the target vehicle is in deceleration operation; The second determination subunit is used to determine the constrained speed according to the target frequency of the sound source noise target value and the number of teeth at the active end of the first reducer, the number of teeth at the passive end of the first reducer, and the number of teeth at the active end of the second reducer.

[0081] Optionally, the system further comprises: A collection submodule, used for collecting the time domain sound pressure level noise in the target area of ​​the vehicle and the sound pressure level noise output by the signal source during the second bench test, wherein the vehicle is any one of the test vehicle and the target vehicle; A frequency domain transformation submodule, used for transforming the time domain sound pressure level noise into a frequency domain to obtain a frequency domain sound pressure level noise; The calculation submodule is used to calculate the sound transmission function according to the sound pressure level noise output by the signal source and the frequency domain sound pressure level noise.

[0082] In a third aspect of the present application, there is provided a Figure 4 The electronic device 100 shown includes a memory 110, a processor 120 and a computer program stored in the memory 110. The processor 120 executes the computer program to implement the target setting method for the whole vehicle sound source noise as described in the first aspect of the present application.

[0083] In a fourth aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the target setting method for the whole vehicle sound source noise as described in the first aspect of the present application is implemented.

[0084] Each embodiment in this specification focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referenced to each other.

[0085] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, devices, or computer program products. Therefore, the embodiments of the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the embodiments of the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0086] The embodiments of the present application are described with reference to the flowcharts and / or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0087] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0088] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, thereby providing instructions for executing on the computer or other programmable terminal device to implement the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0089] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.

[0090] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0091] The above provides a detailed introduction to a method, system, device and medium for setting a target for the sound source noise of a whole vehicle. In this article, specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for a general technician in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A method for setting a target for vehicle source noise, characterized in that: The method comprises: performing 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; Performing a second bench test on the test vehicle and the target vehicle respectively to determine a first sound transfer function of the test vehicle and a second sound transfer function of the target vehicle; Performing a spectrum analysis on the first sound pressure level noise to determine a target sound pressure level noise of the first sound pressure level noise within a preset frequency range; determining a first sound source noise of the test vehicle according to the first sound pressure level noise and the first sound transfer function; Determining a second sound source noise of the target vehicle according to the target sound pressure level noise and the second sound transfer function; A target sound source noise value of the target vehicle is determined according to the first sound source noise and the second sound source noise.

2. The method for setting a target for vehicle source noise according to claim 1, characterized in that: The step of determining a target value of the sound source noise of the target vehicle according to the first sound source noise and the second sound source noise includes: Performing a first bench test on the test vehicle to obtain a driving motor noise of the test vehicle; Obtaining a sound source noise deviation value according to the first sound source noise and the driving motor noise; A target sound source noise value of the target vehicle is determined according to the second sound source noise and the sound source noise deviation value.

3. The method for setting a target for vehicle source noise according to claim 1, characterized in that: The performing spectrum analysis on the first sound pressure level noise to obtain a target sound pressure level noise of the first sound pressure level noise within a preset frequency range includes: Expanding the frequency spectrum of the first sound pressure level noise according to a preset frequency gradient to obtain a plurality of frequency points of the first sound pressure level noise within the preset frequency range; The sound pressure level noise corresponding to each of the frequency points is analyzed, and the maximum sound pressure level noise among the sound pressure level noises is determined as the target sound pressure level noise.

4. The method for setting a target for vehicle source noise according to claim 1, characterized in that: After determining the target value of the sound source noise of the target vehicle, the method further includes: Determining a target frequency of the sound source noise target value according to the sound source noise target value; The restricted rotation speed of the motor of the target vehicle is determined according to the target frequency of the sound source noise target value.

5. The method for setting a target for vehicle source noise according to claim 4, characterized in that: The step of determining the restricted speed of the motor of the target vehicle according to the target frequency of the sound source noise target value includes: When the motor of the target vehicle is in acceleration operation, obtaining the number of teeth at the active end of the primary reducer of the motor; The constrained rotational speed is determined according to the target frequency of the sound source noise target value and the number of teeth at the active end of the primary reducer.

6. The method for setting a target for vehicle source noise according to claim 4, characterized in that: The step of determining the restricted speed of the motor of the target vehicle according to the target frequency of the sound source noise target value includes: When the motor of the target vehicle is in deceleration operation, the number of teeth at the active end of the primary reducer of the motor, the number of teeth at the passive end of the primary reducer, and the number of teeth at the active end of the secondary reducer of the motor are obtained; The constrained speed is determined according to the target frequency of the sound source noise target value, the number of teeth at the active end of the primary reducer, the number of teeth at the passive end of the primary reducer, and the number of teeth at the active end of the secondary reducer.

7. The method for setting a target for vehicle source noise according to claim 1, characterized in that: The method for determining the sound transmission function includes: During the second bench test, collecting the time domain sound pressure level noise in the target area of ​​the vehicle and the sound pressure level noise output by the signal source, the vehicle being either the test vehicle or the target vehicle; Transforming the time domain sound pressure level noise into the frequency domain to obtain the frequency domain sound pressure level noise; The sound transmission 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 setting system for vehicle source noise, characterized in that: The system comprises: A first test module is used to perform a first bench test on the test vehicle to obtain a first sound pressure level noise of the test vehicle under a target test condition; A second test module is used to perform a second bench test on the test vehicle and the target vehicle respectively to determine a first sound transmission function of the test vehicle and a second sound transmission function of the target vehicle; a spectrum analysis module, configured to perform spectrum analysis on the first sound pressure level noise to determine a target sound pressure level noise of the first sound pressure level noise within a preset frequency range; A first determination module, configured to determine a first sound source noise of the test vehicle according to the first sound pressure level noise and the first sound transfer function; A second determination module, configured to determine a second sound source noise of the target vehicle according to the target sound pressure level noise and the second sound transfer function; The third determination module is used to determine a target value of the sound source noise of the target vehicle according to the first sound source noise and the second sound source noise.

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 target setting method for the whole vehicle sound source noise according to 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 a processor, the target setting method for the whole vehicle sound source noise according to any one of claims 1 to 7 is implemented.

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