Method, apparatus, device and medium for determining excitation source transfer path contribution

Abstract

The application provides a method, device, equipment and medium for determining the contribution degree of an excitation source transmission path, the method comprising: collecting white noise emitted by a volume sound source through a first microphone to obtain a first noise spectrum, and collecting white noise emitted by the volume sound source through a second microphone to obtain a second noise spectrum; determining a noise attenuation spectrum according to the first noise spectrum and the second noise spectrum; collecting excitation source working noise through the first microphone and the second microphone to obtain third noise data and fourth noise data respectively; obtaining corresponding third noise spectrum and fourth noise spectrum by processing the third noise data and the fourth noise data respectively; determining a fifth noise spectrum of the excitation source transmitted to the user's ear through the air according to the fourth noise spectrum and the noise attenuation spectrum; and determining the contribution degree of the air transmission path according to the third noise spectrum and the fifth noise spectrum. The application aims to quantify the contribution degree of the air transmission path of the excitation source working noise.

Description

Technical Field

[0001] This invention relates to the field of vehicle steering control technology, and in particular to a method, apparatus, device, and medium for determining the contribution of the excitation source transmission path. Background Technology

[0002] There are two types of noise transmission paths from excitation sources: one is noise generated by the vibration of the excitation source transmitted through the structure, and the other is noise transmitted through the air by the radiated noise of the excitation source. When troubleshooting NVH (Noise, Vibration, Harshness) problems, it is common to verify which transmission path is dominant by disconnecting the installation point of the excitation source or wrapping the excitation source with sound insulation material. However, these methods can only identify which path is the main contributor; they cannot quantify the contribution of each noise transmission path of the excitation source. Summary of the Invention

[0003] In view of this, the present invention provides a method, apparatus, device, and medium for determining the contribution of an excitation source transmission path. The aim is to quantify the contribution of the operating noise of an excitation source to the air transmission path.

[0004] The first aspect of this invention provides a method for determining the contribution of an excitation source transmission path, the method comprising:

[0005] The white noise emitted by the volumetric sound source is collected by the first microphone to obtain the first noise data, and the white noise emitted by the volumetric sound source is collected by the second microphone to obtain the second noise data. The first microphone is placed next to the user's ear, and the volumetric sound source and the second microphone are placed at the location of the excitation source.

[0006] A first noise spectrum is obtained by processing the first noise data, and a second noise spectrum is obtained by processing the second noise data.

[0007] Based on the first noise spectrum and the second noise spectrum, determine the noise attenuation spectrum;

[0008] The first microphone is used to collect the operating noise of the excitation source to obtain the third noise data, and the second microphone is used to collect the operating noise of the excitation source to obtain the fourth noise data.

[0009] A third noise spectrum is obtained by processing the third noise data, and a fourth noise spectrum is obtained by processing the fourth noise data.

[0010] Based on the fourth noise spectrum and the noise attenuation spectrum, a fifth noise spectrum is determined for the operating noise of the excitation source transmitted through the air to the user's ear;

[0011] The air transmission path contribution of the excitation source is determined based on the third noise spectrum and the fifth noise spectrum.

[0012] Optionally, the step of processing the third noise data to obtain a third noise spectrum, and processing the fourth noise data to obtain a fourth noise spectrum, includes:

[0013] The first-order analysis results are obtained by performing waterfall plot processing and order analysis on the third noise data;

[0014] Based on the results of the first-order analysis, the problem frequency of the excitation source is determined;

[0015] Based on the problem frequency, determine the third noise spectrum at the problem frequency in the first-order analysis results;

[0016] The second-order analysis results were obtained by performing waterfall plot processing and order analysis on the fourth noise data;

[0017] Based on the determined problem frequency of the excitation source, the fourth noise spectrum at the problem frequency in the second-order analysis results is determined.

[0018] Optionally, based on the results of the first-order analysis, the problem frequency of the excitation source is determined, including:

[0019] Determine the noise energy corresponding to each frequency in the first-order analysis results;

[0020] The noise energy corresponding to each frequency is compared with a set threshold to obtain the comparison result;

[0021] If, in the comparison results, there is a noise energy exceeding the set threshold among the noise energies corresponding to each frequency, the frequency corresponding to the maximum noise energy among the noise energies exceeding the set threshold is determined as the problem frequency.

[0022] Optionally, determining the air transmission path contribution of the excitation source based on the third noise spectrum and the fifth noise spectrum includes:

[0023] Based on the third noise spectrum, the measured sound pressure level at the problem frequency is determined, and based on the fourth noise spectrum, the theoretical sound pressure level at the problem frequency is determined.

[0024] The air transmission path contribution of the excitation source is determined based on the measured sound pressure level and the theoretical sound pressure level.

[0025] Optionally, determining the air transmission path contribution of the excitation source based on the measured sound pressure level and the theoretical sound pressure level includes:

[0026] The first target value is obtained by subtracting the measured sound pressure level from the theoretical sound pressure level.

[0027] The first target value is compared with each preset value range to determine the preset value range in which the first target value falls, and each preset value range corresponds to each contribution degree.

[0028] The preset value range in which the first target value is located is determined as the target value range, and the contribution degree corresponding to the target value range is determined as the air transmission path contribution degree of the excitation source under the problem frequency.

[0029] Optionally, determining the air transmission path contribution of the excitation source based on the measured sound pressure level and the theoretical sound pressure level includes:

[0030] Based on the measured sound pressure level, the measured noise energy is determined, and based on the theoretical sound pressure level, the theoretical noise energy is determined.

[0031] The theoretical noise energy is divided by the measured noise energy to obtain a second target value, which is then determined as the air transmission path contribution of the excitation source at the problem frequency.

[0032] Optionally, the step of processing the first noise data to obtain a first noise spectrum and processing the second noise data to obtain a second noise spectrum includes:

[0033] The first spectrum is obtained by performing time-frequency domain transformation on the first noise data;

[0034] The first noise spectrum is determined based on the first spectrum and the conjugate of the first spectrum;

[0035] The second noise data is transformed into a second frequency domain to obtain the second spectrum.

[0036] The second noise spectrum is determined based on the second spectrum and the conjugate of the second spectrum.

[0037] A second aspect of the present invention provides an apparatus for determining the contribution of an excitation source transmission path, the apparatus comprising:

[0038] The first noise data acquisition module is used to acquire white noise emitted by a volumetric sound source through a first microphone to obtain first noise data, and to acquire white noise emitted by a volumetric sound source through a second microphone to obtain second noise data. The first microphone is placed next to the user's ear, and the volumetric sound source and the second microphone are placed at the location of the excitation source.

[0039] A first noise data processing module is configured to obtain a first noise spectrum by processing the first noise data, and to obtain a second noise spectrum by processing the second noise data;

[0040] The noise attenuation spectrum determination module is used to determine the noise attenuation spectrum based on the first noise spectrum and the second noise spectrum;

[0041] The second noise data acquisition module is used to collect the operating noise of the excitation source through the first microphone to obtain third noise data, and to collect the operating noise of the excitation source through the second microphone to obtain fourth noise data.

[0042] The second noise data processing module is used to obtain a third noise spectrum by processing the third noise data, and to obtain a fourth noise spectrum by processing the fourth noise data.

[0043] The noise spectrum determination module is used to determine the fifth noise spectrum of the operating noise of the excitation source transmitted to the user's ear through the air, based on the fourth noise spectrum and the noise attenuation spectrum.

[0044] The contribution determination module is used to determine the air transmission path contribution of the excitation source based on the third noise spectrum and the fifth noise spectrum.

[0045] A third aspect of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When executed by the processor, the computer program implements a method for determining the contribution of an excitation source transmission path as described in the first aspect of the present invention.

[0046] A fourth aspect of the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements a method for determining the contribution of an excitation source transmission path as described in the first aspect of the present invention.

[0047] Compared with prior art, the present invention has the following advantages:

[0048] This invention provides a method for determining the contribution of an excitation source transmission path. The method first acquires first noise data by collecting white noise emitted by a volumetric sound source located at the excitation source position using a first microphone positioned near the user's ear; and acquires second noise data by collecting white noise emitted by the volumetric sound source using a second microphone positioned at the excitation source position. The first noise data is processed to obtain a first noise spectrum, and the second noise data is processed to obtain a second noise spectrum. A noise attenuation spectrum is determined based on the first and second noise spectra. The operating noise of the excitation source is acquired using the first microphone to obtain third noise data, and the operating noise of the excitation source is acquired using the second microphone to obtain fourth noise data. The third noise data is processed to obtain a third noise spectrum, and the fourth noise data is processed to obtain a fourth noise spectrum. A fifth noise spectrum is determined based on the fourth noise spectrum and the noise attenuation spectrum, representing the fifth noise spectrum of the excitation source's operating noise transmitted through the air to the user's ear. Finally, the air transmission path contribution of the excitation source at the problem frequency is determined based on the third and fifth noise spectra. Therefore, by testing the noise attenuation of the excitation source (i.e., the noise attenuation spectrum mentioned above), the near-field noise of the excitation source during operation (i.e., the fourth noise spectrum mentioned above), and the noise near the user's ear (i.e., the third noise spectrum mentioned above), the theoretical calculation result of the noise near the user's ear (i.e., the fifth noise spectrum mentioned above) is obtained through theoretical calculation. The theoretical calculation result of the noise near the user's ear is compared with the actual test result (i.e., the third noise spectrum mentioned above), and the contribution of the noise emitted by the excitation source during operation through the air transmission path is determined according to the energy contribution method. Thus, the contribution of the noise of the excitation source during operation through the air transmission path can be quantified.

[0049] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0051] Figure 1 A flowchart illustrating a method for determining the contribution of an excitation source transmission path, provided in an embodiment of the present invention;

[0052] Figure 2 This is a schematic diagram of a device for determining the contribution of an excitation source transmission path, provided in an embodiment of the present invention. Detailed Implementation

[0053] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings.

[0054] Figure 1 A flowchart illustrating a method for determining the contribution of an excitation source transmission path, as provided in an embodiment of the present invention, is shown below. Figure 1 As shown, the method includes:

[0055] Step S1: Collect white noise emitted by the volumetric sound source through the first microphone to obtain first noise data, and collect white noise emitted by the volumetric sound source through the second microphone to obtain second noise data. The first microphone is placed next to the user's ear, and the volumetric sound source and the second microphone are placed at the location of the excitation source.

[0056] Step S2: Obtain a first noise spectrum by processing the first noise data, and obtain a second noise spectrum by processing the second noise data.

[0057] Step S3: Determine the noise attenuation spectrum based on the first noise spectrum and the second noise spectrum.

[0058] Step S4: Collect the operating noise of the excitation source through the first microphone to obtain the third noise data, and collect the operating noise of the excitation source through the second microphone to obtain the fourth noise data.

[0059] Step S5: Obtain a third noise spectrum by processing the third noise data, and obtain a fourth noise spectrum by processing the fourth noise data.

[0060] Step S6: Based on the fourth noise spectrum and the noise attenuation spectrum, determine the fifth noise spectrum of the operating noise of the excitation source transmitted to the user's ear through the air.

[0061] Step S7: Determine the air transmission path contribution of the excitation source based on the third noise spectrum and the fifth noise spectrum.

[0062] In this embodiment, the excitation source refers to a component that generates noise during operation. It can be any component of the vehicle or any component of other machinery or objects, without specific limitations. A mid-to-high frequency volumetric sound source is arranged at the location of the excitation source to generate noise at that location. Simultaneously, a microphone unit (i.e., a second microphone) is arranged at the location of the excitation source to receive the noise at that location. At the same time, a microphone unit (i.e., a first microphone) is arranged near the user's ear to receive the noise at the user's ear. When the excitation source is a component of the vehicle, the location near the user's ear is preferably near the driver's ear. It should be understood that this is only a preferred embodiment, and the location near the user's ear can also be near the ear of a passenger in the front passenger seat or a passenger in the rear passenger seat, without specific limitations. In step S1, a mid-to-high frequency volumetric sound source first operates to generate noise, while the excitation source is not operating. Then, a first microphone collects the white noise emitted by the mid-to-high frequency volumetric sound source near the user's ear, thus obtaining the corresponding first noise data. Simultaneously, a second microphone collects the white noise emitted by the mid-to-high frequency volumetric sound source at the location of the excitation source, thus obtaining the corresponding second noise data. In step S2, the first noise data is processed to obtain the corresponding first noise spectrum, and the second noise data is processed to obtain the corresponding second noise spectrum. The noise spectra mentioned in this invention can be a frequency spectrum, an auto-power spectrum, a linear auto-power spectrum, etc., preferably a linear auto-power spectrum. Each noise spectrum includes a first noise spectrum, a second noise spectrum, a third noise spectrum, a fourth noise spectrum, a fifth noise spectrum, and a noise attenuation spectrum. The noise data mentioned in this invention includes time-domain data or frequency-domain data.

[0063] It is also clearly stated later that, in addition to calculating the air transport path contribution using the linear self-power spectrum, the air transport path contribution can also be calculated using the spectrum.

[0064] In this embodiment, after obtaining the first noise spectrum and the second noise spectrum through step S2, step S3 is executed. Based on the obtained first noise spectrum and second noise spectrum, the attenuation of the noise generated at the location of the excitation source and transmitted to the user's ear is calculated, which is the noise attenuation spectrum generated at the location of the excitation source and transmitted to the user's ear.

[0065] In this embodiment, step S4 is executed. At this time, the mid-to-high frequency volumetric sound source does not work, but the excitation source works to generate the working noise of the excitation source. Then, the working noise generated by the excitation source is collected at the user's ear by the first microphone to obtain the corresponding third noise data. At the same time, the working noise generated by the excitation source is collected at the location of the excitation source by the second microphone to obtain the corresponding fourth noise data.

[0066] In this embodiment, after obtaining the third noise data and the fourth noise data, the third noise data and the fourth noise data are processed respectively to obtain the third noise spectrum corresponding to the third noise data and the fourth noise spectrum corresponding to the fourth noise data.

[0067] In this embodiment, after steps S1 to S5 are completed and the first noise spectrum, second noise spectrum, third noise spectrum and fourth noise spectrum are obtained, step S6 is executed. Based on the noise attenuation spectrum and fourth noise spectrum obtained in steps S3 and S5 respectively, the theoretical noise generated by the excitation source when it is working is calculated to be transmitted to the user's ear through the air transmission path, which is the fifth noise spectrum.

[0068] In this embodiment, after obtaining the third and fifth noise spectra, the third noise spectrum is the result of processing the measured noise transmitted to the user's ear based on the operating noise generated by the excitation source during operation. The fifth noise spectrum is the theoretical noise spectrum of the operating noise generated by the excitation source during operation transmitted to the user's ear through the air, calculated from the third and fifth noise spectra. By calculating the third and fifth noise spectra, the contribution of the excitation source to the noise transmitted through the air transmission path is obtained, which is the proportion of the operating noise generated by the excitation source transmitted to the user's ear through the air transmission path to the noise transmitted through all transmission paths. This allows the user to more accurately locate the NVH problem of the excitation source, and then perform targeted analysis and treatment for the located NVH problem. For example, if the method for determining the contribution of the excitation source transmission path provided by this invention determines that the contribution of the operating noise transmitted through the air transmission path during excitation source operation is 80%, it indicates that the operating noise of the excitation source is mainly transmitted through the air transmission path. In this case, optimization processing of the operating noise of the excitation source is performed starting from the air transmission path to effectively reduce the operating noise of the excitation source transmitted to the user's ear.

[0069] This invention provides a method for determining the contribution of an excitation source transmission path. The method first acquires first noise data by collecting white noise emitted by a volumetric sound source located at the excitation source position using a first microphone positioned near the user's ear; and acquires second noise data by collecting white noise emitted by the volumetric sound source using a second microphone positioned at the excitation source position. The first noise data is processed to obtain a first noise spectrum, and the second noise data is processed to obtain a second noise spectrum. A noise attenuation spectrum is determined based on the first and second noise spectra. Third noise data is acquired by collecting the operating noise of the excitation source using the first microphone, and fourth noise data is acquired by collecting the operating noise of the excitation source using the second microphone. A third noise spectrum is obtained by processing the third noise data into a waterfall plot and performing order analysis, and a fourth noise spectrum is obtained by processing the fourth noise data into a waterfall plot and performing order analysis. A fifth noise spectrum is determined based on the fourth noise spectrum and the noise attenuation spectrum, representing the operating noise of the excitation source transmitted through the air to the user's ear. Finally, the contribution of the excitation source to the air transmission path is determined based on the third and fifth noise spectra. Therefore, by testing the noise attenuation of the excitation source (i.e., the noise attenuation spectrum mentioned above), the near-field noise of the excitation source during operation (i.e., the fourth noise spectrum mentioned above), and the noise near the user's ear (i.e., the third noise spectrum mentioned above), the theoretical calculation result of the noise near the user's ear (i.e., the fifth noise spectrum mentioned above) is obtained through theoretical calculation. The theoretical calculation result of the noise near the user's ear is compared with the actual test result (i.e., the third noise spectrum mentioned above), and the contribution of the noise emitted by the excitation source during operation through the air transmission path is determined according to the energy contribution method. Thus, the contribution of the noise of the excitation source during operation through the air transmission path can be quantified.

[0070] In conjunction with the above embodiments, in one implementation, the present invention further provides a method for determining the contribution of an excitation source transmission path. In this method for determining the contribution of an excitation source transmission path, step S5 includes steps S51 to S55:

[0071] Step S51: Obtain the first-order analysis result by performing waterfall plot processing and order analysis on the third noise data.

[0072] In this embodiment, the third noise data is input into a relevant tool for waterfall plot processing and order analysis to obtain the corresponding first-order analysis result, which includes the noise spectrum at different frequencies.

[0073] Step S52: Determine the problem frequency of the excitation source based on the results of the first-order analysis.

[0074] In this embodiment, the noise generated by the excitation source exists at multiple different frequencies. Only some frequencies of noise are unacceptable to the user's subjective perception; these frequencies are the problem frequencies. Solving the NVH problem of the excitation source first requires determining the problem frequencies. The process for determining the problem frequencies includes, but is not limited to, conducting NVH experiments, collecting noise data, and then converting it to the frequency domain. Frequency bands with higher energy correspond better to the subjective evaluation problem; therefore, these frequency bands are identified. The collected noise is then replayed using a bandpass filter (i.e., only listening to this frequency) or a bandstop filter (filtering out this frequency component) to confirm whether the unacceptable noise heard by the user is at this frequency. If so, the heard or filtered frequency is the problem frequency. Therefore, this invention first determines the problem frequencies of the excitation source based on the results of the first-order analysis.

[0075] Step S53: Determine the third noise spectrum at the problem frequency in the first-order analysis results based on the problem frequency.

[0076] In this embodiment, the first-order analysis result includes noise spectra at different frequencies, including the problem frequency of the excitation source. After determining the problem frequency of the excitation source, the noise spectrum at that problem frequency is selected from the first-order analysis result based on the determined problem frequency; this noise spectrum is the third noise spectrum.

[0077] Step S54: Obtain the second-order analysis result by performing waterfall plot processing and order analysis on the fourth noise data.

[0078] In this embodiment, the same implementation method as step S51 above is used. The fourth noise data is input into the relevant tool for waterfall plot processing and order analysis processing to obtain the corresponding second order analysis result. The second order analysis result includes the noise spectrum of the noise at different frequencies, and the different frequencies will also include the problem frequency of the excitation source.

[0079] Step S55: Based on the determined problem frequency of the excitation source, determine the fourth noise spectrum at the problem frequency in the second-order analysis results.

[0080] In this embodiment, based on the determined problem frequency, the noise spectrum at that problem frequency is selected from the second-order analysis results; this noise spectrum is the fourth noise spectrum. The relevant tools include, but are not limited to, MATLAB, test.Lab, etc.

[0081] In conjunction with the above embodiments, in one implementation, the present invention also provides a method for determining the contribution of an excitation source transmission path. In this method, the problem frequency of the excitation source is determined based on the first-order analysis results, including steps S01 to S03:

[0082] Step S01: Determine the noise energy corresponding to each frequency in the first-order analysis results.

[0083] Step S02: Compare the noise energy corresponding to each frequency with a set threshold to obtain the comparison result.

[0084] Step S03: If, in the comparison results, there is noise energy exceeding the set threshold among the noise energies corresponding to each frequency, the frequency corresponding to the maximum noise energy among the noise energies exceeding the set threshold is determined as the problem frequency.

[0085] In this embodiment, an optional implementation for determining the problem frequency of the excitation source is as follows: based on the obtained first-order analysis results, it is determined whether the noise energy at each frequency exceeds a set threshold. For frequencies where the noise energy exceeds the set threshold, the frequency is determined as the problem frequency. This allows for the determination of the problem frequency during the execution of the invention without prior determination of the problem frequency of the excitation source, thereby improving the efficiency of contribution determination. Furthermore, when multiple frequencies exceed the set threshold, the frequency with the highest noise energy is determined as the problem frequency. The set threshold can be set according to the actual application scenario and is not specifically limited here.

[0086] In this embodiment, the noise generated by the excitation source exists at multiple different frequencies. Only some frequencies of noise are unacceptable to the user's subjective perception; these frequencies are the problem frequencies. Solving the NVH problem of the excitation source first requires identifying the problem frequencies. The process for determining the problem frequencies includes, but is not limited to, conducting NVH experiments, collecting noise data, and then converting it to the frequency domain. Frequency bands with higher energy correspond better to the subjective evaluation problem; therefore, these frequency bands are identified. The collected noise is then replayed using a bandpass filter (i.e., only listening to this frequency) or a bandstop filter (filtering out this frequency component) to confirm whether the unacceptable noise heard by the user is at this frequency. If so, the frequency heard or filtered out is the problem frequency. Then, this invention determines the air transmission path contribution of the operating noise of the excitation source at the problem frequency. When it is determined that the contribution of the operating noise to the excitation source through the air transmission path at the problem frequency exceeds a set threshold, the air transmission path is determined to be the main transmission path of the operating noise at the problem frequency. This is addressed by strengthening and optimizing the acoustic package of the vehicle and increasing sound-absorbing and insulating materials. If the structural transmission path is the main transmission path of the operating noise at the problem frequency, vibration isolation or reinforcement of the support structure is added.

[0087] In conjunction with the above embodiments, in one implementation, the present invention further provides a method for determining the contribution of an excitation source transmission path. In this method for determining the contribution of an excitation source transmission path, step S2 includes steps S21 to S22:

[0088] Step S21: Obtain the first spectrum by performing time-frequency domain transformation on the first noise data.

[0089] Step S22: Determine the first noise spectrum based on the first spectrum and the conjugate of the first spectrum.

[0090] Step S23: Obtain the second spectrum by performing time-frequency domain transformation on the second noise data.

[0091] Step S24: Determine the second noise spectrum based on the second spectrum and the conjugate of the second spectrum.

[0092] In this embodiment, the noise data collected by the microphone is noise data, while the present invention requires frequency domain data for the corresponding calculations. Therefore, one implementation of the present invention for obtaining the first noise spectrum is as follows: white noise emitted by a mid-to-high frequency volumetric sound source is collected near the user's ear by the first microphone to obtain the first noise data; after obtaining the first noise data, the first noise data is subjected to time-frequency domain transformation processing by Fourier transform to obtain the first spectrum belonging to the frequency domain data. Since the first noise spectrum mentioned above in the present invention is a self-power spectrum, the first spectrum obtained by performing time-frequency domain transformation processing on the first noise data is a spectrum diagram. At this time, it is necessary to further multiply the first spectrum with the conjugate of the first spectrum to obtain the first noise spectrum belonging to the self-power spectrum.

[0093] In this embodiment, based on the same implementation method, white noise emitted by a mid-to-high frequency volumetric sound source is collected at the location of the excitation source using a second microphone to obtain second noise data. After obtaining the second noise data, a time-frequency domain transformation is performed on the second noise data using Fourier transform to obtain a second spectrum belonging to the frequency domain data. At this point, it is necessary to further multiply the second spectrum with its conjugate to obtain a second noise spectrum belonging to the power spectrum.

[0094] In conjunction with the above embodiments, in one implementation, the present invention also provides a method for determining the contribution of an excitation source transmission path. In this method, step S3 includes: obtaining a noise attenuation spectrum by dividing the second noise spectrum by the first noise spectrum.

[0095] In this embodiment, one implementation of step S2 is to substitute the first noise spectrum and the second noise spectrum determined in step S1 into the following formula (1) for calculation to obtain the corresponding noise attenuation spectrum:

[0096] NR(f)=p standard source (f) / p St_driver ear (f) (1)

[0097] Where NR(f) is the noise attenuation spectrum, expressed in dB; p standard source (f) represents the second noise spectrum; p St_driver ear (f) represents the first noise spectrum.

[0098] In conjunction with the above embodiments, in one implementation, the present invention also provides a method for determining the contribution of an excitation source transmission path. In this method, step S6 includes: obtaining a fifth noise spectrum by dividing the fourth noise spectrum by the noise attenuation spectrum.

[0099] In this embodiment, one implementation of step S6 is to substitute the fourth noise spectrum determined in step S5 and the noise attenuation spectrum determined in step S3 into the following formula (2) to calculate the corresponding fifth noise spectrum:

[0100] p predicted noise (f)=p excitation source (f) / NR(f) (2)

[0101] Where, p predicted noise (f) represents the fifth noise spectrum; p excitation source (f) represents the fourth noise spectrum.

[0102] In conjunction with the above embodiments, in one implementation, the present invention further provides a method for determining the contribution of an excitation source transmission path. In this method for determining the contribution of an excitation source transmission path, step S7 includes steps S71 to S72:

[0103] Step S71: Determine the measured sound pressure level at the problem frequency based on the third noise spectrum, and determine the theoretical sound pressure level at the problem frequency based on the second-order analysis results.

[0104] In this embodiment, after obtaining the third noise spectrum at the problem frequency, the sound pressure level is converted and calculated to obtain the measured sound pressure level of the operating noise of the excitation source at the problem frequency transmitted to the user's ear. After obtaining the fifth noise spectrum at the problem frequency, the theoretical sound pressure level of the operating noise of the excitation source at the problem frequency transmitted to the user's ear through the air transmission path is obtained by converting and calculating the sound pressure level of the fifth noise spectrum.

[0105] Step S72: Determine the air transmission path contribution of the excitation source based on the measured sound pressure level and the theoretical sound pressure level.

[0106] In this embodiment, after obtaining the measured sound pressure level and theoretical sound pressure level of the excitation source's operating noise at the problem frequency through step S71, the contribution of the excitation source's operating noise at the problem frequency to the air transmission path is obtained by calculating the measured sound pressure level and theoretical sound pressure level.

[0107] In conjunction with the above embodiments, in one implementation, the present invention further provides a method for determining the contribution of an excitation source transmission path. In this method for determining the contribution of an excitation source transmission path, step S72 includes steps S7201 to S7202:

[0108] Step S7201: Determine the measured noise energy based on the measured sound pressure level, and determine the theoretical noise energy based on the theoretical sound pressure level.

[0109] In this embodiment, after obtaining the measured sound pressure level and the theoretical sound pressure level through step S71, the measured sound pressure level and the theoretical sound pressure level are respectively substituted into the following formulas (3) and (4) for calculation to obtain the corresponding measured noise energy and theoretical noise energy:

[0110]

[0111]

[0112] Among them, E test To measure noise energy; E airbone Theoretical noise energy; L test For measuring sound pressure level; L predicted This is the theoretical sound pressure level.

[0113] Step S7202: Divide the theoretical noise energy by the measured noise energy to obtain a second target value, and determine the second target value as the air transmission path contribution of the excitation source at the problem frequency.

[0114] In this embodiment, after calculating the measured noise energy and the theoretical noise energy in step S7201, the calculated theoretical noise energy is divided by the calculated measured noise energy to obtain a second target value. This second target value is determined as the contribution of the operating noise of the excitation source to the air transmission path at the problem frequency. This allows for the accurate determination of the contribution of the operating noise of the excitation source to the air transmission path at the problem frequency.

[0115] Specifically, the air transmission path contribution of the excitation source is calculated using the following formula:

[0116]

[0117] Among them, Contribution airbone E represents the contribution of the air transport path of the excitation source. airbone It is the theoretical noise energy of the excitation source radiated noise transmitted to the driver's ear inside the vehicle through the air transmission path; E test It is the measured noise energy near the driver's ear inside the vehicle when the excitation source is working, obtained from actual testing.

[0118] In conjunction with the above embodiments, in one implementation, the present invention further provides a method for determining the contribution of an excitation source transmission path. In this method for determining the contribution of an excitation source transmission path, step S72 includes steps S721 to S723:

[0119] Step S721: Obtain the first target value by subtracting the measured sound pressure level from the theoretical sound pressure level.

[0120] In this embodiment, the measured sound pressure level obtained in step S71 is subtracted from the theoretical sound pressure level obtained in step S71 to obtain the corresponding calculation result, which is the first target value.

[0121] Step S722: Compare the first target value with each preset value range to determine the preset value range in which the first target value is located, wherein each preset value range corresponds to each contribution degree.

[0122] In this embodiment, multiple preset value ranges are pre-defined, and a one-to-one correspondence is established between each preset value range and the contribution of each airborne transmission path. In a preferred embodiment, the pre-defined preset value ranges include: greater than 6 dB, less than 6 dB and greater than 3 dB, less than 3 dB and greater than 1 dB, and less than 1 dB. The established one-to-one correspondence between the preset value ranges and the contribution of the airborne transmission paths includes: when the preset value range is greater than 6 dB, the contribution of the corresponding airborne transmission path is within 25%; when the preset value range is less than 6 dB and greater than 3 dB, the contribution of the corresponding airborne transmission path is between 25% and 50%; when the preset value range is less than 3 dB and greater than 1 dB, the contribution of the corresponding airborne transmission path is between 50% and 79.4%; and when the preset value range is less than 1 dB, the contribution of the corresponding airborne transmission path is within 20.6%. The aforementioned one-to-one correspondence between the preset value ranges and their contribution to the air transport path is only a preferred embodiment. Other value ranges and other correspondences can also be used, and are not specifically limited here. The first target value obtained in step S721 is compared with each preset value range to determine the preset value range in which the first target value falls.

[0123] Step S723: Determine the preset value range in which the first target value is located as the target value range, and determine the contribution degree corresponding to the target value range as the air transmission path contribution degree of the excitation source under the problem frequency.

[0124] In this embodiment, the preset value range in which the first target value falls is defined as the target value range. Then, through the one-to-one correspondence between each preset value range and the contribution of each air transmission path, the contribution of the air transmission path corresponding to the target value range is determined. The determined contribution of the air transmission path is then defined as the contribution of the operating noise of the excitation source to the transmission of noise through the air transmission path at the problem frequency. Thus, by dividing multiple preset value ranges and constructing a one-to-one correspondence between the preset value ranges and the contribution of the air transmission path, it is convenient to quickly determine the contribution of the operating noise of the excitation source to the transmission of noise through the air transmission path.

[0125] A second aspect of the present invention provides an apparatus for determining the contribution of an excitation source transmission path, such as... Figure 2 As shown, the device 200 includes:

[0126] The first noise data acquisition module 201 is used to acquire white noise emitted by a volumetric sound source through a first microphone to obtain first noise data, and to acquire white noise emitted by a volumetric sound source through a second microphone to obtain second noise data. The first microphone is placed next to the user's ear, and the volumetric sound source and the second microphone are placed at the location of the excitation source.

[0127] The first noise data processing module 202 is used to obtain a first noise spectrum by processing the first noise data, and to obtain a second noise spectrum by processing the second noise data;

[0128] The noise attenuation spectrum determination module 203 is used to determine the noise attenuation spectrum based on the first noise spectrum and the second noise spectrum;

[0129] The second noise data acquisition module 204 is used to acquire the operating noise of the excitation source through the first microphone to obtain the third noise data, and to acquire the operating noise of the excitation source through the second microphone to obtain the fourth noise data.

[0130] The second noise data processing module 205 is used to obtain a third noise spectrum by processing the third noise data, and to obtain a fourth noise spectrum by processing the fourth noise data.

[0131] The noise spectrum determination module 206 is used to determine the fifth noise spectrum of the operating noise of the excitation source transmitted to the user's ear through the air, based on the fourth noise spectrum and the noise attenuation spectrum.

[0132] The contribution determination module 207 is used to determine the air transmission path contribution of the excitation source based on the third noise spectrum and the fifth noise spectrum.

[0133] Optionally, the second noise data processing module 205 includes:

[0134] The first analysis module is used to obtain the first-order analysis result by performing waterfall plot processing and order analysis on the third noise data;

[0135] The problem frequency determination module is used to determine the problem frequency of the excitation source based on the results of the first-order analysis.

[0136] The first determining module is used to determine the third noise spectrum at the problem frequency in the first order analysis result based on the problem frequency.

[0137] The second analysis module is used to obtain the second-order analysis results by performing waterfall plot processing and order analysis on the fourth noise data;

[0138] The second determining module is used to determine the fourth noise spectrum at the problem frequency in the second-order analysis result based on the determined problem frequency of the excitation source.

[0139] Optionally, the problem frequency determination module includes:

[0140] The noise energy determination module is used to determine the noise energy corresponding to each frequency in the first-order analysis results.

[0141] The noise energy comparison module is used to compare the noise energy corresponding to each frequency with a set threshold to obtain the comparison result;

[0142] The problem frequency determination module is used to determine the frequency corresponding to the maximum noise energy among the noise energies exceeding the set threshold when the comparison results indicate that there is noise energy exceeding the set threshold.

[0143] Optionally, the contribution determination module 207 includes:

[0144] The sound pressure level determination module is used to determine the measured sound pressure level at the problem frequency based on the third noise spectrum, and to determine the theoretical sound pressure level at the problem frequency based on the fifth noise spectrum.

[0145] The contribution determination submodule is used to determine the air transmission path contribution of the excitation source based on the measured sound pressure level and the theoretical sound pressure level.

[0146] Optionally, the contribution determination submodule includes:

[0147] The first target value determination module is used to obtain the first target value by subtracting the measured sound pressure level from the theoretical sound pressure level;

[0148] The value range determination module is used to compare the first target value with each preset value range to determine the preset value range in which the first target value is located, wherein each preset value range corresponds to each contribution degree.

[0149] The first contribution determination module is used to determine the preset value range in which the first target value is located as the target value range, and to determine the contribution corresponding to the target value range as the air transmission path contribution of the excitation source at the problem frequency.

[0150] Optionally, the contribution determination submodule includes:

[0151] A noise energy determination module is used to determine the measured noise energy based on the measured sound pressure level, and to determine the theoretical noise energy based on the theoretical sound pressure level.

[0152] The second contribution determination module is used to divide the theoretical noise energy by the measured noise energy to obtain a second target value, and to determine the second target value as the air transmission path contribution of the excitation source at the problem frequency.

[0153] Optionally, the first noise data processing module 202 includes:

[0154] The first spectrum determination module is used to obtain the first spectrum by performing time-frequency domain transformation processing on the first noise data;

[0155] The first noise spectrum determination module is used to determine the first noise spectrum based on the first spectrum and the conjugate of the first spectrum;

[0156] The second spectrum determination module is used to obtain the second spectrum by performing time-frequency domain transformation processing on the second noise data;

[0157] The second noise spectrum determination module is used to determine the second noise spectrum based on the second spectrum and the conjugate of the second spectrum.

[0158] A third aspect of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When executed by the processor, the computer program implements a method for determining the contribution of an excitation source transmission path as described in the first aspect of the present invention.

[0159] A fourth aspect of the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements a method for determining the contribution of an excitation source transmission path as described in the first aspect of the present invention.

[0160] It should be noted that, for the sake of simplicity, the method embodiments are all described as a series of actions. However, those skilled in the art should understand that the embodiments of the present invention are not limited to the described order of actions, because according to the embodiments of the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions involved are not necessarily essential to the embodiments of the present invention.

[0161] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present invention are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk (SSD)).

[0162] 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 apparatus 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 apparatus. 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 apparatus that includes said element.

[0163] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0164] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A method of determining an excitation source transfer path contribution, characterized by, The method comprises: acquiring first noise data by collecting white noise emitted by a volume sound source through a first microphone, and acquiring second noise data by collecting white noise emitted by the volume sound source through a second microphone, the first microphone being arranged beside an ear of a user, and the volume sound source and the second microphone being arranged at a position of an excitation source; obtaining a first noise spectrum by processing the first noise data, and obtaining a second noise spectrum by processing the second noise data; determining a noise attenuation spectrum according to the first noise spectrum and the second noise spectrum; acquiring third noise data by collecting working noise of the excitation source through the first microphone, and acquiring fourth noise data by collecting working noise of the excitation source through the second microphone; obtaining a third noise spectrum by processing the third noise data, and obtaining a fourth noise spectrum by processing the fourth noise data; determining a fifth noise spectrum of the working noise of the excitation source transmitted to the ear of the user through air according to the fourth noise spectrum and the noise attenuation spectrum; determining an air transmission path contribution degree of the excitation source according to the third noise spectrum and the fifth noise spectrum.

2. The method of determining the excitation source transfer path contribution degree according to claim 1, characterized in that, The method of obtaining the third noise spectrum by processing the third noise data, and obtaining the fourth noise spectrum by processing the fourth noise data, comprises: obtaining a first order analysis result by waterfall chart processing and order analysis on the third noise data; determining a problem frequency of the excitation source according to the first order analysis result; determining a third noise spectrum at the problem frequency in the first order analysis result according to the problem frequency; obtaining a second order analysis result by waterfall chart processing and order analysis on the fourth noise data; determining a fourth noise spectrum at the problem frequency in the second order analysis result according to the determined problem frequency of the excitation source.

3. The method of determining the excitation source transfer path contribution of claim 2, wherein, The method of determining a problem frequency of the excitation source according to the first order analysis result, comprises: determining noise energy corresponding to each frequency in the first order analysis result; comparing the noise energy corresponding to each frequency with a set threshold to obtain a comparison result; in a case where the comparison result represents that there is noise energy exceeding the set threshold in the noise energy corresponding to each frequency, determining a frequency corresponding to maximum noise energy in each noise energy exceeding the set threshold as the problem frequency.

4. The method of determining the excitation source transfer path contribution of claim 2, wherein, The method of determining an air transmission path contribution degree of the excitation source according to the third noise spectrum and the fifth noise spectrum, comprises: determining a measured sound pressure level at a problem frequency according to the third noise spectrum, and determining a theoretical sound pressure level at the problem frequency according to the fifth noise spectrum; determining the air transmission path contribution degree of the excitation source according to the measured sound pressure level and the theoretical sound pressure level.

5. The method of determining the excitation source transfer path contribution of claim 4, wherein, The method of determining the air transmission path contribution degree of the excitation source according to the measured sound pressure level and the theoretical sound pressure level, comprises: obtaining a first target value by subtracting the theoretical sound pressure level from the measured sound pressure level. The first target value is compared with each preset value range to determine a preset value range in which the first target value is located, each preset value range corresponding to a respective contribution degree; The preset value range in which the first target value is located is determined as a target value range, and the contribution degree corresponding to the target value range is determined as the air transmission path contribution degree of the excitation source at the problem frequency.

6. The method of determining the excitation source transfer path contribution of claim 4, wherein, The air transmission path contribution degree of the excitation source is determined according to the measured sound pressure level and the theoretical sound pressure level, including: The measured noise energy is determined according to the measured sound pressure level, and the theoretical noise energy is determined according to the theoretical sound pressure level; The theoretical noise energy is divided by the measured noise energy to obtain a second target value, and the second target value is determined as the air transmission path contribution degree of the excitation source at the problem frequency.

7. The method of determining the excitation source transfer path contribution level of claim 1, wherein, The first noise spectrum is obtained by processing the first noise data, and the second noise spectrum is obtained by processing the second noise data, including: The first frequency spectrum is obtained by time-frequency domain conversion processing of the first noise data; The first noise spectrum is determined according to the first frequency spectrum and the conjugate of the first frequency spectrum; The second frequency spectrum is obtained by time-frequency domain conversion processing of the second noise data; The second noise spectrum is determined according to the second frequency spectrum and the conjugate of the second frequency spectrum.

8. An apparatus for determining the contribution of an excitation source transmission path, characterized in that, The device includes: The noise data acquisition first module is configured to acquire first noise data by collecting white noise emitted by a volume sound source through a first microphone, and acquire second noise data by collecting white noise emitted by the volume sound source through a second microphone, the first microphone being arranged near a user's ear, and the volume sound source and the second microphone being arranged at a position of an excitation source; The noise data processing first module is configured to obtain a first noise spectrum by processing the first noise data, and obtain a second noise spectrum by processing the second noise data; The noise attenuation spectrum determination module is configured to determine a noise attenuation spectrum according to the first noise spectrum and the second noise spectrum; The noise data acquisition second module is configured to acquire third noise data by collecting working noise of the excitation source through the first microphone, and acquire fourth noise data by collecting working noise of the excitation source through the second microphone; The noise data processing second module is configured to obtain a third noise spectrum by processing the third noise data, and obtain a fourth noise spectrum by processing the fourth noise data; The noise spectrum determination module is configured to determine a fifth noise spectrum of the working noise of the excitation source transmitted to the user's ear through air according to the fourth noise spectrum and the noise attenuation spectrum; The contribution degree determination module is configured to determine the air transmission path contribution degree of the excitation source according to the third noise spectrum and the fifth noise spectrum.

9. An electronic device, comprising: The computer program is stored in the memory and executable on the processor, and when executed by the processor, implements a method for determining the transmission path contribution degree of the excitation source according to any one of claims 1 to 7.

10. A computer-readable storage medium having stored thereon a computer program, characterized in that The computer program, which is executed by a processor, implements a method of determining the contribution of a transmission path of an excitation source according to any one of claims 1 to 7.

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