CN105872908A - Denoising method and device for brake system - Google Patents
Denoising method and device for brake system Download PDFInfo
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- CN105872908A CN105872908A CN201610344362.1A CN201610344362A CN105872908A CN 105872908 A CN105872908 A CN 105872908A CN 201610344362 A CN201610344362 A CN 201610344362A CN 105872908 A CN105872908 A CN 105872908A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention provides a denoising method and device for a brake system. The denoising method for the brake system comprises steps as follows: acquiring noise signals; screening the noise signals, and obtaining a low-frequency brake noise signal; analyzing the low-frequency brake noise signal, and generating a denoising signal coherent with the low-frequency brake noise signal according to coherent wave coherent conditions; playing the denoising signal. According to the technical scheme, an active denoising technology is adopted, low-frequency brake noise can be effectively reduced in the principle of sound wave interference, and the noise optimizing period is short.
Description
Technical field
The present invention relates to brake system of car noise reduction field, particularly relate to a kind of brakes noise-reduction method and
Device.
Background technology
What automobile noise was common mainly have tire to make an uproar, make an uproar in road, wind is made an uproar, engine noise, brake oil etc. are several
Individual aspect, brake oil is a kind of noise that automobile is common when braking.Brake oil occurs often in low
Speed, Immobilization operating mode, decibel, by 70 to 120 decibels, easily causes people irritated.Automobile brake noise
Control is a part critically important in automotive engineering.The current Main Means solving brake oil is to change to rub
Wipe secondary structure, reduce the noise generation frequency.But the method using structure to improve is only capable of reducing braking
The occurrence frequency of noise, the low-frequency brake that can not evade brake oil, especially below 500Hz completely is made an uproar
Sound.And the method using structure to improve solves brake oil problem and needs stand repeatedly and car load checking,
The consuming time is long.
Summary of the invention
Based on above-mentioned the deficiencies in the prior art, the present invention proposes a kind of brakes noise-reduction method and device,
The scope that the amplitude of low-frequency brake noise can accept, and noise optimization week can be effectively reduced to people
Phase is short.
The present invention provides a kind of brakes noise-reduction method, and the method includes:
Acquisition noise signal；
Screen described noise signal, obtain low-frequency brake noise signal；
Described low-frequency brake noise signal is analyzed, according to coherent wave coherent condition, generate one with
The de-noising signal that described low-frequency brake noise signal is relevant；
Play de-noising signal.
Further, described acquisition noise signal, including:
Acquisition noise acoustic information；
Described noise sound information is changed into the signal of telecommunication as noise signal.
Further, the described noise signal of described screening, obtain low-frequency brake noise signal, including:
Low-frequency brake noise signal is filtered out according to low-frequency brake noise frequency.
Further, described described low-frequency brake noise signal is analyzed, is concerned with bar according to coherent wave
Part, generates a de-noising signal relevant with described low-frequency brake noise signal, including:
The amplitude of analysing low frequency brake oil signal and phase place；
Amplitude according to the low-frequency brake noise signal analyzed and phase place, generate one and described low frequency system
Moving noise signal amplitude is equal, the de-noising signal of opposite in phase.
Further, described broadcasting de-noising signal, including:
The de-noising signal output that will generate；
By described de-noising signal power amplification；
The de-noising signal of power amplification promotes speaker sounding, plays de-noising signal.
The present invention provides a kind of brakes denoising device, and this device includes:
Noise Acquisition unit, for acquisition noise signal；
Analysis and processing unit, is used for screening described noise signal, obtains low-frequency brake noise signal；To institute
State low-frequency brake noise signal to be analyzed, according to coherent wave coherent condition, generate one and described low frequency
The de-noising signal of brake oil signal coherence；
Noise reduction implementation unit, is used for playing de-noising signal.
Further, during described Noise Acquisition unit acquisition noise signal, specifically for:
Acquisition noise acoustic information；
Described noise sound information is changed into the signal of telecommunication as noise signal.
Further, described analysis and processing unit screens described noise signal, obtains low-frequency brake noise letter
Number time, specifically for:
Low-frequency brake noise signal is filtered out according to low-frequency brake noise frequency.
Further, described low-frequency brake noise signal is analyzed by described analysis and processing unit, according to
Coherent wave coherent condition, when generating the de-noising signal that is concerned with described low-frequency brake noise signal, tool
Body is used for:
The amplitude of analysing low frequency brake oil signal and phase place；
Amplitude according to the low-frequency brake noise signal analyzed and phase place, generate one and described low frequency system
Moving noise signal amplitude is equal, the de-noising signal of opposite in phase.
Further, described noise reduction implementation unit, including:
Dolby circuit output module, for the de-noising signal output generated by Reduction Analysis unit；
Small-power power amplifier module, for by described de-noising signal power amplification；
Speaker, for being promoted its sounding by the de-noising signal of power amplification, plays de-noising signal.
The brakes noise-reduction method of present invention offer and device, use active noise reduction techniques, believes from noise
Filter out low-frequency brake noise signal, analysing low frequency brake oil signal in number, produce one and low frequency system
The de-noising signal of moving noise signal coherence, utilizes the principle of sound wave interference, reduces the mesh of brake oil
's.And the present invention propose brakes noise-reduction method and device, go out brakes at an engine bench test
After the low-frequency brake noise signal being likely to occur, the most permissible by low-frequency brake noise signal is analyzed
It is carried out noise reduction or repetition test, it is not necessary to stand and complete vehicle test verify its effectiveness repeatedly.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality
Execute the required accompanying drawing used in example or description of the prior art to be briefly described, it should be apparent that below,
Accompanying drawing in description is only embodiments of the invention, for those of ordinary skill in the art, not
On the premise of paying creative work, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided.
Fig. 1 is a kind of brakes noise-reduction method schematic flow sheet disclosed in the embodiment of the present invention；
Fig. 2 is the structural representation of a kind of brakes denoising device disclosed in the embodiment of the present invention；
Fig. 3 is a kind of brakes denoising device layout in actual use disclosed in the embodiment of the present invention
Schematic diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present invention, and
It is not all, of embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
Go out the every other embodiment obtained under creative work premise, broadly fall into the scope of protection of the invention.
The embodiment of the invention discloses a kind of brakes noise-reduction method, see Fig. 1, the method includes:
S101, acquisition noise signal；
By voice collection device, such as mike, it is placed on noise source adnexa and gathers all noise signals,
As it is shown on figure 3, device is arranged in brake caliper periphery, it is simple to voice collection device is adopted the most in time
Collection noise.
S102, screen described noise signal, obtain low-frequency brake noise signal；
The present invention is directed the noise reduction process to low-frequency brake noise signal, voice collection device gathers
Noise signal, is not simple low-frequency brake noise signal.Because voice collection device only gathers merit
Can and do not possess analyze acoustical signal ability, so voice collection device gather noise signal except bag
Containing also include outside brake oil signal tire make an uproar, other acoustic informations such as wind is made an uproar, engine noise, therefore,
For the ease of present invention research, need described noise signal is screened, therefrom filter out low-frequency brake
Noise carries out noise reduction process.
S103, described low-frequency brake noise signal is analyzed, according to coherent wave coherent condition, generates
One de-noising signal relevant with described low-frequency brake noise signal；
The ripple that two row amplitudes are identical, constant phase difference, the direction of propagation are identical is referred to as coherent wave, and two row are relevant
Ripple can interfere scene spatial transmission when, and i.e. two train wave superpositions become the ripple that string is new.This
The bright principle of interference utilizing ripple exactly makes sonic wave amplitude reduce, so that sound wave weakens, it is achieved noise reduction.Root
According to sound wave interference principle, analysing low frequency brake oil signal herein, obtain its amplitude and phase place, then give birth to
Become one identical with low-frequency brake noise amplitude signal, the sound wave of opposite in phase, two train waves are at spatial transmission
Time, it may occur that superposition, due to two train wave opposite in phase, the result of superposition is that amplitude subtracts each other, therefore superposition
After sonic wave amplitude can be far smaller than the amplitude of primary sound ripple, thus reached the purpose of noise reduction.
S104, broadcasting de-noising signal.
The de-noising signal that previous step generates is transformed into physical sound information play out, makes de-noising signal
Propagate in space, interfere with low-frequency brake noise signal, reach noise reduction purpose.
The brakes noise-reduction method that the present invention provides, uses active noise reduction techniques, sieves from noise signal
Select low-frequency brake noise signal, analysing low frequency brake oil signal, produce one and low-frequency brake noise
The de-noising signal of signal coherence, utilizes the principle of sound wave interference, reduces the purpose of brake oil.
And it is further desired that explanation, the brakes noise-reduction method that the embodiment of the present invention proposes, one
After secondary engine bench test goes out the brake oil signal that brakes is likely to occur, by low-frequency brake noise is believed
Number it is analyzed just it to be carried out noise reduction or repetition test, it is not necessary to stand and complete vehicle test come repeatedly
Verify its effectiveness.
Optionally, in another embodiment of the present invention, described acquisition noise signal, including:
1) acquisition noise acoustic information；
Utilize voice collection device, such as mike, carry out acquisition noise acoustic information.Present invention research be
The noise reduction of brake oil, the noise that can't distinguish collection during acquisition noise information is brake oil or tire
Make an uproar or wind such as is made an uproar at other noises, all noise sound are all acquired, in subsequent processing steps herein
Middle meeting filters out low-frequency brake noise and carries out noise reduction.
2) described noise sound information is changed into the signal of telecommunication as noise signal.
Voice collection device, such as mike, can be converted into the signal of telecommunication by noise sound information: sound
Sound vibration is passed on the vibrating diaphragm of mike, and the Magnet inside promotion produces the electric current of change, the electric current of change
Deliver to process circuit be amplified processing, generate the signal of telecommunication.
Optionally, in another embodiment of the present invention, the described noise signal of described screening, obtain low
Frequently brake oil signal, including: filter out low-frequency brake noise signal according to low-frequency brake noise frequency.
Concrete, each sound all has the feature being different from other sound because of the frequency of its uniqueness,
Brake oil is also such.Low-frequency brake noise has the frequency of its uniqueness, in bench test or actually used
In, the frequency of low-frequency brake noise can be tested out.According to the frequency of low-frequency brake noise, Ke Yicong
Numerous noise signals are obtained the low-frequency brake noise signal wanted by frequency screening.Such as: Ke Yishe
Meter is suitable for the low pass filter of low-frequency brake noise frequency, filters out low-frequency brake from numerous noise signals
Noise signal.
Optionally, in another embodiment of the present invention, described described low-frequency brake noise signal is entered
Row is analyzed, and according to coherent wave coherent condition, generates a fall relevant with described low-frequency brake noise signal
Noise cancellation signal, including:
1) amplitude of analysing low frequency brake oil signal and phase place；
After the amplitude obtaining noise signal and phase place, can generate according to coherent wave principle of interference
The sound wave relevant with noise signal.
2) according to amplitude and the phase place of the low-frequency brake noise signal analyzed, one and described low frequency are generated
Brake oil signal amplitude is equal, the de-noising signal of opposite in phase.
Amplitude is equal, two train wave superpositions of opposite in phase, can be greatly reduced the amplitude of two train waves simultaneously, reach
To noise reduction purpose.
Optionally, in another embodiment of the present invention, described broadcasting de-noising signal, including:
1) the de-noising signal output that will generate；
Abovementioned steps generates de-noising signal, needs exist for exporting described de-noising signal, and entering reality should
Use the de-noising signal stage.
2) by described de-noising signal power amplification；
De-noising signal to be interfered with low-frequency noise signal in space, needs de-noising signal is changed into physics
Acoustic information is play in space, it is therefore desirable to by its power amplification in order to promote speaker sounding.
3) de-noising signal of power amplification promotes speaker sounding, plays de-noising signal.
The embodiment of the invention discloses a kind of brakes denoising device, see Fig. 2, this device includes:
Noise Acquisition unit 201, for acquisition noise signal；
A Noise Acquisition unit 201 actually voice collection device, such as mike, is placed on noise
Acquisition noise near sound source.
Analysis and processing unit 202, is used for screening described noise signal, obtains low-frequency brake noise signal；Right
Described low-frequency brake noise signal is analyzed, according to coherent wave coherent condition, generate one low with described
Frequently the de-noising signal of brake oil signal coherence；
The present invention is directed the noise reduction process to low-frequency brake noise signal, Noise Acquisition unit 201 is adopted
The noise signal of collection, is not simple low-frequency brake noise signal.Because voice collection device is only adopted
Collect function and do not possess the ability of analysis acoustical signal, so the noise letter that Noise Acquisition unit 201 gathers
Number also include in addition to comprising brake oil signal tire make an uproar, other sound letter such as wind is made an uproar, engine noise
Breath, therefore, for the ease of present invention research, needs analysis and processing unit 202 to enter described noise signal
Row filter, therefrom filters out low-frequency brake noise to carry out noise reduction process.
The ripple that two row amplitudes are identical, constant phase difference, the direction of propagation are identical is referred to as coherent wave, and two row are relevant
Ripple can interfere scene spatial transmission when, and i.e. two train wave superpositions become the ripple that string is new.This
The bright principle of interference utilizing ripple exactly makes sonic wave amplitude reduce, so that sound wave weakens, it is achieved noise reduction.Root
According to sound wave interference principle, analysis and processing unit 202 analysing low frequency brake oil signal, obtain its amplitude and
Phase place, then generation one is identical with low-frequency brake noise amplitude signal, the sound wave of opposite in phase, two row
Ripple is when spatial transmission, it may occur that superposition, and due to two train wave opposite in phase, the result of superposition is amplitude phase
Subtracting, therefore the sonic wave amplitude after superposition can be far smaller than the amplitude of primary sound ripple, has thus reached the mesh of noise reduction
's.
Noise reduction implementation unit 203, is used for playing de-noising signal.
The de-noising signal that analysis and processing unit 202 generates is transformed into physical sound information play out, makes fall
Noise cancellation signal is propagated in space, interferes with low-frequency brake noise signal, reaches noise reduction purpose.
The brakes denoising device that the present invention provides, uses active noise reduction techniques, analysis and processing unit 202
From noise signal, filter out low-frequency brake noise signal, analysing low frequency brake oil signal, produce one
The de-noising signal relevant with low-frequency brake noise signal, utilizes the principle of sound wave interference, reduces braking
The purpose of noise.
And it is further desired that explanation, the brakes denoising device that the embodiment of the present invention proposes, one
After secondary engine bench test goes out the low-frequency brake noise that brakes is likely to occur, by low-frequency brake noise is believed
Number it is analyzed just it to be carried out noise reduction or repetition test, it is not necessary to stand and complete vehicle test come repeatedly
Verify its effectiveness.
Optionally, in another embodiment of the present invention, described Noise Acquisition unit 201 acquisition noise letter
Number time, specifically for:
1) acquisition noise acoustic information；
Utilize voice collection device, such as mike, carry out acquisition noise acoustic information.Present invention research be
The noise reduction of brake oil, the noise that can't distinguish collection during acquisition noise information is brake oil or tire
Making an uproar or wind such as is made an uproar at other noises, all noise sound are all acquired by Noise Acquisition unit 201,
The work of other unit follow-up can filter out low-frequency brake noise and carry out noise reduction.
2) described noise sound information is changed into the signal of telecommunication as noise signal.
Voice collection device, such as mike, can be converted into the signal of telecommunication by noise sound information: sound
Sound vibration is passed on the vibrating diaphragm of mike, and the Magnet inside promotion produces the electric current of change, the electric current of change
Deliver to process circuit be amplified processing, generate the signal of telecommunication.
Optionally, in another embodiment of the present invention, described analysis and processing unit 202 screen described in make an uproar
Acoustical signal, when obtaining low-frequency brake noise signal, specifically for:
Low-frequency brake noise signal is filtered out according to low-frequency brake noise frequency.
Concrete, each sound all has the feature being different from other sound because of the frequency of its uniqueness,
Brake oil is also such.Low-frequency brake noise has the frequency of its uniqueness, in bench test or actually used
In, the frequency of low-frequency brake noise can be tested out.According to the frequency of low-frequency brake noise, at analysis
The low-frequency brake noise that reason unit 202 can obtain wanting by frequency screening from numerous noise signals is believed
Number.Such as: the low pass filter of applicable low-frequency brake noise frequency can be designed, from numerous noise signals
In filter out low-frequency brake noise signal.
Optionally, in another embodiment of the present invention, described analysis and processing unit 202 is to described low
Frequently brake oil signal is analyzed, and according to coherent wave coherent condition, generates one and described low-frequency brake
During the de-noising signal that noise signal is concerned with, specifically for:
1) amplitude of analysing low frequency brake oil signal and phase place；
After the amplitude obtaining noise signal and phase place, can generate according to coherent wave principle of interference
The sound wave relevant with noise signal.
2) according to amplitude and the phase place of the low-frequency brake noise signal analyzed, one and described low frequency are generated
Brake oil signal amplitude is equal, the de-noising signal of opposite in phase.
Amplitude is equal, two train wave superpositions of opposite in phase, can be greatly reduced the amplitude of two train waves simultaneously, reach
To noise reduction purpose.
Optionally, in another embodiment of the present invention, described noise reduction implementation unit 203, including:
Dolby circuit output module, for the de-noising signal output generated by Reduction Analysis unit；
Analysis and processing unit 202 generates de-noising signal, and Dolby circuit output module needs described fall
Noise cancellation signal exports, and enters the reality application de-noising signal stage.
Small-power power amplifier module, for by described de-noising signal power amplification；
De-noising signal to be interfered with low-frequency noise signal in space, needs de-noising signal is changed into physics
Acoustic information space play, it is therefore desirable to small-power power amplifier module by de-noising signal power amplification in order to push away
Dynamic speaker sounding.
Speaker, for being promoted its sounding by the de-noising signal of power amplification, plays de-noising signal.
Brakes denoising device of the present invention also includes a power supply interface, for car load power supply even
Connect and power to brakes denoising device of the present invention.
Another embodiment of the present invention discloses the use method for arranging of described brakes denoising device, sees
Shown in Fig. 3: by brakes denoising device (in figure shown in 2) of the present invention, be arranged on automobile system
Dynamic device calipers assembly (in figure shown in 1) periphery or the clearest and the most definite oscillation point periphery.
Before being braked the design of system denoising device, first brake is carried out the noise matching on basis,
There is with clearly this brake the tendency producing low-frequency noise, determine the noise frequency section that this brake produces,
Brakes denoising device realizes sound wave interference in assigned frequency, to reach good noise reduction.
Brakes denoising device is arranged in brake calipers assembly periphery or clear and definite oscillation point periphery,
When automobile brake produces noise, denoising device can acquisition noise information, generation interference the most rapidly
Sound wave, reaches noise reduction purpose.
It addition, be arranged close to noise source by denoising device, also meet the coherent wave direction of propagation identical
Condition, noise sound wave and noise reduction sound wave have identical propagation conditions and the direction of propagation, are beneficial to realize maximum
The sound wave interference of scope, it is achieved the noise reduction of higher degree.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses
The present invention.Multiple amendment to these embodiments will be aobvious and easy for those skilled in the art
See, generic principles defined herein can without departing from the spirit or scope of the present invention,
Realize in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein,
And it is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (10)
1. a brakes noise-reduction method, it is characterised in that including:
Acquisition noise signal；
Screen described noise signal, obtain low-frequency brake noise signal；
Described low-frequency brake noise signal is analyzed, according to coherent wave coherent condition, generate one with
The de-noising signal that described low-frequency brake noise signal is relevant；
Play de-noising signal.
Method the most according to claim 1, it is characterised in that described acquisition noise signal, including:
Acquisition noise acoustic information；
Described noise sound information is changed into the signal of telecommunication as noise signal.
Method the most according to claim 1, it is characterised in that the described noise signal of described screening,
Obtain low-frequency brake noise signal, including:
Low-frequency brake noise signal is filtered out according to low-frequency brake noise frequency.
Method the most according to claim 1, it is characterised in that described to described low-frequency brake noise
Signal is analyzed, according to coherent wave coherent condition, generate one with described low-frequency brake noise signal phase
Dry de-noising signal, including:
The amplitude of analysing low frequency brake oil signal and phase place；
Amplitude according to the low-frequency brake noise signal analyzed and phase place, generate one and described low frequency system
Moving noise signal amplitude is equal, the de-noising signal of opposite in phase.
Method the most according to claim 1, it is characterised in that described broadcasting de-noising signal, including:
The de-noising signal output that will generate；
By described de-noising signal power amplification；
The de-noising signal of power amplification promotes speaker sounding, plays de-noising signal.
6. a brakes denoising device, it is characterised in that including:
Noise Acquisition unit, for acquisition noise signal；
Analysis and processing unit, is used for screening described noise signal, obtains low-frequency brake noise signal；To institute
State low-frequency brake noise signal to be analyzed, according to coherent wave coherent condition, generate one and described low frequency
The de-noising signal of brake oil signal coherence；
Noise reduction implementation unit, is used for playing de-noising signal.
Device the most according to claim 6, it is characterised in that described Noise Acquisition unit collection is made an uproar
During acoustical signal, specifically for:
Acquisition noise acoustic information；
Described noise sound information is changed into the signal of telecommunication as noise signal.
Device the most according to claim 6, it is characterised in that described analysis and processing unit screens institute
State noise signal, when obtaining low-frequency brake noise signal, specifically for:
Low-frequency brake noise signal is filtered out according to low-frequency brake noise frequency.
Device the most according to claim 6, it is characterised in that described analysis and processing unit is to described
Low-frequency brake noise signal is analyzed, and according to coherent wave coherent condition, generates one and described low frequency system
During the de-noising signal of moving noise signal coherence, specifically for:
The amplitude of analysing low frequency brake oil signal and phase place；
Amplitude according to the low-frequency brake noise signal analyzed and phase place, generate one and described low frequency system
Moving noise signal amplitude is equal, the de-noising signal of opposite in phase.
Device the most according to claim 6, it is characterised in that described noise reduction implementation unit, bag
Include:
Dolby circuit output module, for the de-noising signal output generated by Reduction Analysis unit；
Small-power power amplifier module, for by described de-noising signal power amplification；
Speaker, for being promoted its sounding by the de-noising signal of power amplification, plays de-noising signal.
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| CN201610344362.1A CN105872908A (en) | 2016-05-23 | 2016-05-23 | Denoising method and device for brake system |
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| EP3401902A1 (en) * | 2017-05-10 | 2018-11-14 | FCA Italy S.p.A. | Improvement of the acoustic comfort in the passenger compartment of a motor vehicle |
| CN108877761A (en) * | 2017-05-10 | 2018-11-23 | Fca意大利股份公司 | The improvement of acoustic comfort in motor vehicle passenger compartment |
| US10163433B2 (en) | 2017-05-10 | 2018-12-25 | Fca Italy S.P.A. | Acoustic comfort in the passenger compartment of a motor vehicle |
| WO2019033832A1 (en) * | 2017-08-18 | 2019-02-21 | 比亚迪股份有限公司 | Noise processing method, apparatus and device for railway vehicle, and storage medium |
| CN108597489A (en) * | 2018-04-21 | 2018-09-28 | 中车青岛四方机车车辆股份有限公司 | A kind of bullet train car Active noise control system |
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