CN115217696B - Noise control method, device and vehicle manufacturing method - Google Patents
Noise control method, device and vehicle manufacturing method Download PDFInfo
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- CN115217696B CN115217696B CN202210775489.4A CN202210775489A CN115217696B CN 115217696 B CN115217696 B CN 115217696B CN 202210775489 A CN202210775489 A CN 202210775489A CN 115217696 B CN115217696 B CN 115217696B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 238000012360 testing method Methods 0.000 claims abstract description 24
- 238000001228 spectrum Methods 0.000 claims description 79
- 238000012546 transfer Methods 0.000 claims description 38
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
- F02M35/1294—Amplifying, modulating, tuning or transmitting sound, e.g. directing sound to the passenger cabin; Sound modulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The application relates to the technical field of automobiles, and discloses a noise control method, a device and a vehicle manufacturing method, wherein the method comprises the following steps: determining a target frequency range of a target object based on result data of a whole vehicle test, wherein the target object is an element or a component in the whole vehicle, and the target frequency range satisfies: the noise strength of the noise emitted by the target object received at a selected location within the target frequency range is greater than a first strength threshold that is greater than the lowest strength of the noise emitted by the target object received at the selected location; the noise parameters of the target object are adjusted to mitigate the noise strength of noise emitted by the target object received at the selected location over the target frequency range. The noise control method and device and the vehicle manufacturing method can effectively improve the mute performance of the vehicle.
Description
Technical Field
The application relates to the technical field of vehicles, in particular to a noise control method and device and a vehicle manufacturing method.
Background
When a vehicle runs at a high speed, various dynamic noises are generated, wherein engine noise is one of the main noise sources in the vehicle. The air inlet system is a key accessory of the engine, huge noise can be generated at the air inlet when the engine works, and the noise generated at the air inlet can be transmitted to the carriage through an air path because the air inlet of the engine is closer to the carriage, so that the experience of drivers and passengers is affected.
Disclosure of Invention
In view of the above, the present application provides a noise control method, apparatus, and vehicle manufacturing method, which can effectively improve the silence performance of a vehicle. Specifically, the method comprises the following technical scheme:
the embodiment of the application provides a noise control method, which comprises the following steps:
determining a target frequency range of a target object based on result data of a whole vehicle test, wherein the target object is an element or a component in the whole vehicle, and the target frequency range satisfies: the noise strength of the noise emitted by the target object received at a selected location within the target frequency range is greater than a first strength threshold that is greater than the lowest strength of the noise emitted by the target object received at the selected location;
the noise parameters of the target object are adjusted to mitigate the noise strength of noise emitted by the target object received at the selected location over the target frequency range.
In an implementation manner of the embodiment of the present application, the determining, based on result data of the whole vehicle test, a target frequency range of a target object includes:
acquiring an acoustic transfer function curve at the selected position under the condition of exciting a point acoustic source placed at the target object;
under the acceleration working condition of the whole vehicle, acquiring a first noise spectrum at the selected position and a second noise spectrum at the target object;
and determining the target frequency range according to the comparison result of the sound transfer function curve, the first noise spectrum and the second noise spectrum.
In an implementation manner of the embodiment of the present application, the determining the target frequency range according to the comparison result of the acoustic transfer function curve, the first noise spectrum and the second noise spectrum includes:
acquiring a first frequency range corresponding to a noise peak value of the acoustic transfer function curve, a second frequency range corresponding to a noise peak value of the first noise spectrum and a third frequency range corresponding to a noise peak value of the second noise spectrum;
and determining a coincidence range among the first frequency range, the second frequency range and the third frequency range, and taking the coincidence range as the target frequency range.
In an implementation manner of the embodiment of the present application, the adjusting the noise parameter of the target object includes:
selecting a muffler according to the target frequency range, and/or
The size of the target object is changed.
In an implementation manner of the embodiment of the present application, after the adjusting the noise parameter of the target object, the method further includes:
acquiring a third noise spectrum at the selected position based on the result data of the whole vehicle verification;
determining a maximum noise intensity of the third noise spectrum within the target frequency range;
ending the noise control method in response to the maximum noise strength not being greater than a second strength threshold,
wherein the second intensity threshold is less than the first intensity threshold.
The embodiment of the application also provides a noise control device, which comprises:
the first determining module is configured to determine a target frequency range of a target object based on result data of a whole vehicle test, wherein the target object is an element or a component in the whole vehicle, and the target frequency range satisfies: the noise strength of the noise emitted by the target object received at a selected location within the target frequency range is greater than a first strength threshold that is greater than the lowest strength of the noise emitted by the target object received at the selected location;
an adjustment module configured to adjust a noise parameter of the target object to mitigate a noise strength of noise emitted by the target object received at the selected location within the target frequency range.
In one implementation manner of the embodiment of the present application, the determining module includes:
a first acquisition sub-module configured to acquire an acoustic transfer function curve at the selected position under a condition that a point acoustic source placed at the target object is excited;
the second acquisition submodule is configured to acquire a first noise spectrum at the selected position and a second noise spectrum at the target object under the condition of acceleration of the whole vehicle;
a determination submodule configured to determine the target frequency range based on a comparison of the acoustic transfer function curve, the first noise spectrum, and the second noise spectrum.
In one implementation of the embodiment of the present application, the determining submodule is further configured to:
acquiring a first frequency range corresponding to a noise peak value of the acoustic transfer function curve, a second frequency range corresponding to a noise peak value of the first noise spectrum and a third frequency range corresponding to a noise peak value of the second noise spectrum;
and determining a coincidence range among the first frequency range, the second frequency range and the third frequency range, and taking the coincidence range as the target frequency range.
In one implementation of the embodiment of the present application, the adjustment module is further configured to:
selecting a muffler according to the target frequency range, and/or
The size of the target object is changed.
In one implementation manner of the embodiment of the present application, the apparatus further includes:
the acquisition module is configured to acquire a third noise spectrum at the selected position based on the result data of the whole vehicle verification;
a second determination module configured to determine a maximum noise intensity of the third noise spectrum within the target frequency range;
an ending module configured to end the noise control method in response to the maximum noise strength not being greater than a second strength threshold.
The embodiment of the application also provides a vehicle manufacturing method, which comprises the following steps:
acquiring noise parameters of the adjusted target object based on the noise control method;
a vehicle is manufactured based on the noise parameters.
The beneficial effects of the technical scheme provided by the embodiment of the application at least comprise:
according to the noise control method, the device and the vehicle manufacturing method, the frequency range with strong transmission capability in noise emitted by the target object can be identified by determining the target frequency range of the target object, and further the influence of the noise generated by the target object at the selected position can be effectively reduced by reducing the noise intensity corresponding to the target frequency range, so that the mute performance of the vehicle is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic flow chart of a noise control method according to an embodiment of the present application;
fig. 2 is a schematic flow chart of another noise control method according to an embodiment of the present application;
FIG. 3 is a schematic flow chart of determining a target frequency range according to an embodiment of the present application;
fig. 4 illustrates noise spectrums corresponding to a target object and a selected position respectively before and after adjusting noise parameters of the target object according to an embodiment of the present application;
fig. 5 shows a schematic structural diagram of a noise control apparatus according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure. In order to make the technical solution and advantages of the present application more clear, the noise control method, apparatus and device will be described in detail below with reference to the accompanying drawings.
Fig. 1 illustrates a noise control method provided in an embodiment of the present application, where the method may be performed by an electronic device such as a computer. As shown in fig. 1, the method comprises the steps of:
step S101, determining a target frequency range of a target object based on result data of the whole vehicle test.
The target object is an element or a component in the whole vehicle, and the target frequency range satisfies the following conditions: the noise strength of the noise emitted by the target object received at the selected location within the target frequency range is greater than a first strength threshold that is greater than the lowest strength of the noise emitted by the target object received at the selected location.
Step S102, adjusting noise parameters of the target object to reduce noise intensity of noise emitted by the target object received at the selected position within the target frequency range.
According to the noise control method provided by the embodiment of the application, the frequency range with stronger transmission capability in noise emitted by the target object can be identified by determining the target frequency range of the target object, and further the influence of the noise generated by the target object at the selected position can be effectively reduced by reducing the noise intensity corresponding to the target frequency range, so that the mute performance of the vehicle is improved.
Optionally, determining the target frequency range of the target object based on the result data of the whole vehicle test includes:
under the condition of exciting a point sound source placed at a target object, acquiring an acoustic transfer function curve at a selected position;
under the acceleration working condition of the whole vehicle, acquiring a first noise spectrum at a selected position and a second noise spectrum at a target object;
and determining a target frequency range according to the comparison result of the acoustic transfer function curve, the first noise spectrum and the second noise spectrum.
Optionally, determining the target frequency range according to the comparison result of the acoustic transfer function curve, the first noise spectrum and the second noise spectrum includes:
acquiring a first frequency range corresponding to a noise peak value of the acoustic transfer function curve, a second frequency range corresponding to a noise peak value of the first noise spectrum and a third frequency range corresponding to a noise peak value of the second noise spectrum;
a coincidence range between the first frequency range, the second frequency range, and the third frequency range is determined, and the coincidence range is taken as a target frequency range.
Optionally, adjusting the noise parameter of the target object includes:
selecting a muffler, and/or
The size of the target object is changed.
Optionally, after adjusting the noise parameter of the target object, the method further comprises:
acquiring a third noise spectrum at a selected position based on result data of the whole vehicle verification;
determining a maximum noise intensity of the third noise spectrum within the target frequency range;
in response to the maximum noise strength not being greater than the second strength threshold, ending the noise control method,
wherein the second intensity threshold is less than the first intensity threshold.
Fig. 2 illustrates another noise control method provided in an embodiment of the present application, which may be performed by an electronic device such as a computer. As shown in fig. 2, the method comprises the steps of:
step 201, acquiring an acoustic transfer function curve at a selected position under the condition of exciting a point acoustic source placed at a target object.
In an embodiment of the present application, before acquiring the acoustic transfer function curve at the selected location, the method may further include: and acquiring a target object selected by the tester. In some embodiments, the target object may be selected based on the noise contribution of the critical system to the whole vehicle.
In this embodiment of the present application, the target object is an element or a component in the whole vehicle. The target object may be selected as an air intake system, in particular an air intake of the air intake system, for example. Because the air inlet system can generate huge noise when the engine works, and the air inlet system is closer to the carriage, the influence of the generated noise on drivers and passengers in the carriage is larger, and the mute performance of the vehicle can be effectively improved by reducing the influence of the noise generated by the air inlet system on the drivers and passengers. In addition, the structure of the air inlet system in the vehicle is simpler, and the influence of noise generated by the air inlet system on drivers and passengers can be easily reduced by redesigning the structure of the air inlet system.
After the target object is selected, the tester can place a point sound source at a position corresponding to the target object in the whole vehicle and place a microphone at the selected position. In embodiments of the present application, the point source may be placed at an air intake of a vehicle air intake system, and the selected location may be a plurality of locations within the cabin, and may specifically include front and rear passenger seat locations.
The point sound source is an ideal sound source, and can uniformly radiate sound energy in all directions within a certain frequency range after being excited under the free field condition. A microphone is an energy conversion device capable of converting an acoustic signal into an electrical signal. In embodiments of the present application, the electronic device for performing the noise control method may be in signal connection with microphones placed at respective selected locations to obtain acoustic transfer function (Acoustic transfer function, ATF) curves at the selected locations through the microphones.
Under the condition of exciting a point sound source placed at a target object, the acquired sound transfer function curve at a selected position can represent the influence of noise emitted by the target object on drivers and passengers in a carriage in the whole vehicle environment to a certain extent under ideal conditions. The acoustic transfer function curve may be displayed on the electronic device as a graph with frequency on the abscissa and noise amplitude on the ordinate.
Step 202, under the acceleration working condition of the whole vehicle, acquiring a first noise spectrum at a selected position and a second noise spectrum at a target object.
Under the actual acceleration condition of the whole vehicle, other systems besides the target object, such as an engine, a water pump and the like near an air inlet, can generate noise and further influence drivers and passengers. Therefore, the noise characteristics received at the selected position also need to be analyzed under the actual acceleration condition of the whole vehicle.
In the embodiment of the application, a whole vehicle test can be performed under the full throttle acceleration working condition, and the microphone is used for acquiring the first noise frequency spectrum at the selected position. The first noise spectrum can represent the influence of noise suffered by drivers and passengers in the carriage under the actual acceleration working condition of the whole car to a certain extent.
In addition, the tester can also place a microphone at the target object, and acquire a second noise spectrum at the target object in the whole vehicle test under the full throttle acceleration working condition. The second noise spectrum can represent the noise characteristic emitted by the target object under the actual acceleration working condition of the whole vehicle to a certain extent.
The first noise spectrum and the second noise spectrum are similar to the acoustic transfer function curves described above and may be displayed on the electronic device as graphs with frequency on the abscissa and noise amplitude on the ordinate.
In the embodiment of the application, the whole vehicle test under the full throttle acceleration working condition can be performed under each gear, and one gear can be selected to perform the whole vehicle test.
Step 203, determining a target frequency range according to the acoustic transfer function curve, the comparison result of the first noise spectrum and the second noise spectrum.
In the embodiment of the present application, the target frequency range of the target object may satisfy: the noise strength of the noise emitted by the target object received at the selected location within the target frequency range is greater than a first strength threshold that is greater than the lowest strength of the noise emitted by the target object received at the selected location.
The first intensity threshold may be determined based on a maximum noise intensity received at a selected location in the vehicle test. Illustratively, the first intensity threshold may be a particular percentage of the maximum noise intensity received at the selected location, such as 95%, 90%, 85%, 80%, 75%, or 70%, etc.
In some embodiments, the target frequency range may also include only the frequency bin value or range corresponding to the maximum noise intensity.
In an embodiment of the present application, as shown in fig. 3, the process of determining the target frequency range may include the following sub-steps:
step 2031, obtaining a first frequency range corresponding to a noise peak of the acoustic transfer function curve, a second frequency range corresponding to a noise peak of the first noise spectrum, and a third frequency range corresponding to a noise peak of the second noise spectrum.
In this step, the electronic device may traverse the noise magnitudes corresponding to different frequencies in the acoustic transfer function curve and determine a maximum noise magnitude in the acoustic transfer function curve to determine as a noise peak. Further, a frequency point corresponding to the noise peak value is determined, and a frequency range corresponding to a noise amplitude range with noise intensity larger than a first intensity threshold value is determined as the first frequency range by taking the frequency point as a center.
Illustratively, in one acoustic transfer function curve, the noise peak is 80 db, which corresponds to a frequency point of 800 hz. The first intensity threshold may be selected to be 90% of the maximum noise intensity, and thus a range of noise magnitudes having noise intensities greater than the first intensity threshold may be determined to be 72-80 db, and a first frequency range determined based on the acoustic transfer function curve may be 700-900 hz.
Based on a similar method, a second frequency range corresponding to a noise peak of the first noise spectrum and a third frequency range corresponding to a noise peak of the second noise spectrum are determined.
It should be noted that, in the acoustic transfer function curve, the first noise spectrum and the second noise spectrum, the first intensity threshold may be determined as the same percentage of the maximum noise intensity, but the specific amplitude value of the first threshold is different because the maximum noise intensity of each of the acoustic transfer function curve, the first noise spectrum and the second noise spectrum is different.
Step 2032, determining a coincidence range between the first frequency range, the second frequency range, and the third frequency range, and taking the coincidence range as the target frequency range.
In this embodiment of the present application, after the first frequency range, the second frequency range, and the third frequency range are determined, an intersection may be taken for the three frequency ranges, and the intersection may be determined as the target frequency range. The frequency range of the target object is determined by comparing the frequency characteristic of noise sent out by the target object received at the selected position under ideal conditions, the frequency characteristic of noise received at the selected position under the actual acceleration working condition of the whole vehicle and the frequency characteristic of noise sent out by the target object under the actual acceleration working condition of the whole vehicle, so that the target frequency range determined in the embodiment of the application can represent the frequency range with stronger transmission capability in the noise sent out by the target object to a certain extent. That is, noise emitted by the target object corresponding to the frequency range can be more easily transmitted to a selected location, such as an occupant seat in a vehicle cabin, to be heard by a driver. In some embodiments, the target frequency range is prone to resonance with the natural frequency of the cabin so that noise within the target frequency range may be more easily transferred to the selected location.
In this embodiment of the present application, the determined target frequency range may be one range or may be multiple ranges.
Step 204, adjusting the noise parameter of the target object to reduce the noise intensity of the noise emitted from the target object received at the selected position within the target frequency range.
After the target frequency range of the target object is determined, the noise intensity corresponding to the target frequency range can be reduced, and then the noise intensity transmitted to the selected position is reduced. The noise parameter of the target object may include at least one of noise intensity and structural size.
In the embodiment of the application, the noise intensity emitted by the target object can be reduced by adding the muffler at the target object. Mufflers are generally only capable of muffling noise over a range of frequencies. The appropriate muffler can be selected according to the target frequency range to minimize the reduction in the target frequency range. Noise amplitude generated at the target object.
In other embodiments, the frequency characteristics of noise emitted by the target object may also be changed by changing the size of the target object. For example, the air intake system may include an air intake pipe and an air filter. The test staff can reduce the noise intensity emitted by the air inlet system through the volume of the air filter, or the test staff can also change the frequency corresponding to the maximum noise intensity in the noise emitted by the air inlet system through changing the length and the section size of the air inlet pipe so as to avoid resonance between the frequency corresponding to the maximum noise intensity and the natural frequency of the carriage, which is equivalent to reducing the noise intensity of the noise emitted by the target object received at the selected position in the target frequency range.
Step 205, based on the result data of the vehicle verification, obtaining a third noise spectrum at the selected position.
After the noise parameters of the target object are adjusted, the whole vehicle verification can be performed on the adjustment result, and whether the adjustment result accords with the expectation or not is determined based on the result data of the whole vehicle verification.
Similar to step 202, when the vehicle is verified, the vehicle test can be performed under the actual acceleration condition of the vehicle, for example, under the full throttle acceleration condition. And meanwhile, a third noise spectrum at the selected position is acquired through the microphone, and the third noise spectrum can represent the influence of noise on drivers and passengers in the carriage after the noise parameters of the target object are adjusted under the actual acceleration working condition of the whole vehicle to a certain extent.
Step 206, determining the maximum noise intensity of the third noise spectrum in the target frequency range.
After the electronic device acquires the third noise spectrum at the selected location, a maximum noise intensity within the target frequency range may be determined from the third noise spectrum.
Step 207, ending the noise control method in response to the maximum noise intensity not being greater than the second intensity threshold.
When it is determined that the maximum noise intensity in the target frequency range is not greater than the second intensity threshold, it can be considered that the adjustment result of the target object has reached the expectation, and the influence of the noise emitted from the target object on the driver is small, so that the noise control method can be ended.
In this embodiment, the second intensity threshold is smaller than the first intensity threshold. And, the second intensity threshold may be determined based on a minimum noise intensity received at a selected location in the vehicle test. Illustratively, the second intensity threshold may exceed a certain percentage of the minimum noise intensity received at the selected location, such as 5%, 10%, 15%, 20%, or the like.
In other words, in the embodiment of the present application, the noise parameter of the adjustment target object needs to satisfy: within the target frequency range, the acoustic transfer function curve (or noise spectrum) corresponding to the target object has no obvious noise peak.
Fig. 4 shows the noise spectra corresponding to the target object and the selected position, respectively, before and after adjusting the noise parameters of the target object. As can be seen from fig. 4, after the noise parameters of the target object are adjusted, the noise intensity of the noise emitted by the target object in the target frequency range is reduced, and the noise intensity of the noise received at the selected position in the target frequency range is correspondingly reduced, so that the mute performance of the vehicle is effectively improved, and the influence of the vehicle noise on drivers and passengers is reduced.
Furthermore, as can be seen from fig. 4, the noise characteristics corresponding to the noise transfer path from the target object to the selected position are substantially unchanged.
In some embodiments, the above-described step 204 may be returned in response to the maximum noise strength being greater than the second strength threshold. That is, the method may further comprise: in response to the maximum noise strength being greater than the second strength threshold, continuing to adjust noise parameters of the target object to mitigate noise strengths of noise emitted by the target object received at the selected location within the target frequency range.
According to the noise control method provided by the embodiment of the application, the frequency range with stronger transmission capability in noise emitted by the target object can be identified by determining the target frequency range of the target object, and further the influence of the noise generated by the target object at the selected position can be effectively reduced by reducing the noise intensity corresponding to the target frequency range, so that the mute performance of the vehicle is improved.
In the embodiment of the present application, the whole vehicle test and the whole vehicle verification may be performed based on an actual sample vehicle, or may be performed based on a simulation model of the whole vehicle. After an expected result is obtained based on a sample car test or a whole car simulation model test, the vehicle can be designed based on the adjusted noise parameter of the target object corresponding to the expected result, so that the noise frequency characteristic of the target object can be improved in the design stage of the vehicle, and the mute performance of the vehicle can be improved.
The embodiment of the application also provides a manufacturing method of the vehicle, which comprises the following steps:
acquiring noise parameters of the adjusted target object based on the noise control method; and manufacturing the vehicle based on the noise parameter.
In some embodiments, after the expected result is obtained based on the sample car test or the whole car simulation model test, the structure of the target object may be designed based on the adjusted noise parameter of the target object corresponding to the expected result, for example, determining a muffler loaded at the target object, or determining the size data of the target object, and then assembling the vehicle by using the target object and other required parts.
In addition, the embodiment of the present application further provides a noise control apparatus, as shown in fig. 5, the noise control apparatus 500 may include:
the first determining module 501 is configured to determine a target frequency range of a target object based on result data of a vehicle test, where the target object is an element or a component in the vehicle, and the target frequency range satisfies: the noise intensity of the noise emitted by the target object received at the selected location within the target frequency range is greater than a first intensity threshold that is greater than the lowest intensity of the noise emitted by the target object received at the selected location;
an adjustment module 502 is configured to adjust noise parameters of the target object to mitigate noise intensity of noise emitted by the target object received at the selected location within the target frequency range.
Optionally, the determining module may include:
a first acquisition sub-module configured to acquire an acoustic transfer function curve at a selected position under a condition of exciting a point acoustic source placed at a target object;
the second acquisition submodule is configured to acquire a first noise spectrum at a selected position and a second noise spectrum at a target object under the condition of acceleration of the whole vehicle;
a determination submodule configured to determine a target frequency range based on the acoustic transfer function curve, the comparison of the first noise spectrum and the second noise spectrum.
Optionally, the determining submodule may be further configured to:
acquiring a first frequency range corresponding to a noise peak value of the acoustic transfer function curve, a second frequency range corresponding to a noise peak value of the first noise spectrum and a third frequency range corresponding to a noise peak value of the second noise spectrum;
a coincidence range between the first frequency range, the second frequency range, and the third frequency range is determined, and the coincidence range is taken as a target frequency range.
Optionally, the adjustment module may be further configured to:
selecting a muffler according to a target frequency range, and/or
The size of the target object is changed.
Optionally, the apparatus may further include:
the acquisition module is configured to acquire a third noise spectrum at a selected position based on the result data of the whole vehicle verification;
a second determination module configured to determine a maximum noise intensity of the third noise spectrum within the target frequency range;
an ending module configured to end the noise control method in response to the maximum noise strength not being greater than the second strength threshold.
The specific manner in which the respective devices perform the operations in the above-described embodiments have been described in detail in relation to the embodiments of the method, and will not be described in detail here.
It should be noted that: the noise control device and the noise control method provided in the foregoing embodiments belong to the same concept, and specific implementation processes thereof are detailed in the method embodiments and are not described herein again.
In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" refers to two or more, unless explicitly defined otherwise.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. The specification and examples are to be regarded in an illustrative manner only.
It is to be understood that the present application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (8)
1. A method of noise control, the method comprising:
determining a target frequency range of a target object based on result data of a whole vehicle test, wherein the target object is an element or a component in the whole vehicle, and the target frequency range satisfies: the noise strength of the noise emitted by the target object received at a selected location within the target frequency range is greater than a first strength threshold that is greater than the lowest strength of the noise emitted by the target object received at the selected location;
adjusting noise parameters of the target object to mitigate noise intensity of noise emitted from the target object received at the selected location within the target frequency range,
the determining the target frequency range of the target object based on the result data of the whole vehicle test comprises the following steps:
acquiring an acoustic transfer function curve at the selected position under the condition of exciting a point acoustic source placed at the target object;
under the acceleration working condition of the whole vehicle, acquiring a first noise spectrum at the selected position and a second noise spectrum at the target object;
and determining the target frequency range according to the comparison result of the sound transfer function curve, the first noise spectrum and the second noise spectrum.
2. The method of claim 1, wherein said determining said target frequency range from a comparison of said acoustic transfer function curve, said first noise spectrum and said second noise spectrum comprises:
acquiring a first frequency range corresponding to a noise peak value of the acoustic transfer function curve, a second frequency range corresponding to a noise peak value of the first noise spectrum and a third frequency range corresponding to a noise peak value of the second noise spectrum;
and determining a coincidence range among the first frequency range, the second frequency range and the third frequency range, and taking the coincidence range as the target frequency range.
3. The method of claim 1, wherein said adjusting noise parameters of said target object comprises:
selecting a muffler according to the target frequency range, and/or
The size of the target object is changed.
4. The method of claim 1, wherein after said adjusting the noise parameter of the target object, the method further comprises:
acquiring a third noise spectrum at the selected position based on the result data of the whole vehicle verification;
determining a maximum noise intensity of the third noise spectrum within the target frequency range;
ending the noise control method in response to the maximum noise strength not being greater than a second strength threshold,
wherein the second intensity threshold is less than the first intensity threshold.
5. A noise control apparatus, the apparatus comprising:
the first determining module is configured to determine a target frequency range of a target object based on result data of a whole vehicle test, wherein the target object is an element or a component in the whole vehicle, and the target frequency range satisfies: the noise strength of the noise emitted by the target object received at a selected location within the target frequency range is greater than a first strength threshold that is greater than the lowest strength of the noise emitted by the target object received at the selected location;
an adjustment module configured to adjust a noise parameter of the target object to mitigate a noise strength of noise emitted by the target object received at the selected location within the target frequency range,
wherein the determining module comprises:
a first acquisition sub-module configured to acquire an acoustic transfer function curve at the selected position under a condition that a point acoustic source placed at the target object is excited;
the second acquisition submodule is configured to acquire a first noise spectrum at the selected position and a second noise spectrum at the target object under the condition of acceleration of the whole vehicle;
a determination submodule configured to determine the target frequency range based on a comparison of the acoustic transfer function curve, the first noise spectrum, and the second noise spectrum.
6. The noise control apparatus of claim 5, wherein the determination submodule is further configured to:
acquiring a first frequency range corresponding to a noise peak value of the acoustic transfer function curve, a second frequency range corresponding to a noise peak value of the first noise spectrum and a third frequency range corresponding to a noise peak value of the second noise spectrum;
and determining a coincidence range among the first frequency range, the second frequency range and the third frequency range, and taking the coincidence range as the target frequency range.
7. The noise control apparatus of claim 5, wherein the adjustment module is further configured to:
selecting a muffler according to the target frequency range, and/or
The size of the target object is changed.
8. A method of manufacturing a vehicle, the method comprising:
the noise control method of claim 1, acquiring noise parameters of the adjusted target object;
a vehicle is manufactured based on the noise parameters.
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