CN109767749A - A kind of Active noise control system and noise initiative control method based on seat - Google Patents
A kind of Active noise control system and noise initiative control method based on seat Download PDFInfo
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- CN109767749A CN109767749A CN201910012241.0A CN201910012241A CN109767749A CN 109767749 A CN109767749 A CN 109767749A CN 201910012241 A CN201910012241 A CN 201910012241A CN 109767749 A CN109767749 A CN 109767749A
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Abstract
The embodiment of the present invention discloses a kind of Active noise control system and noise initiative control method based on seat.Wherein, the system comprises seat and oise damping means, the oise damping means includes housing, loudspeaker, reference sensor and noise controller, and the noise controller is connected with the loudspeaker and the reference sensor respectively；The reference sensor is used for acquisition noise signal, the noise controller is used to generate the noise elimination signal for offsetting the noise signal according to the noise signal, the loudspeaker is arranged on the seat for issuing the noise elimination signal, the housing in the housing.Active noise control system and noise initiative control method provided in an embodiment of the present invention based on seat, reduces the noise in housing.
Description
Technical field
The present embodiments relate to technical field of traffic transportation, and in particular to a kind of noise impedance system based on seat
System and noise initiative control method.
Background technique
It is also higher and higher to the requirement of its riding comfort with the fast development of bullet train, and noise is to influence train
An important factor for riding comfort.
Noise circumstance in train enclosure space is changeable and complicated, and simple sound absorption and sound insulation treatment measures can not expire
Control requirement of the foot to the noise in train, especially for low-frequency noise.As absorbing sound and insulating against sound used by treatment measures
The acoustical damping properties of material are decayed as frequency reduces, if obtaining the identical noise reduction effect of high-frequency noises section in low-frequency noise section
Fruit then needs to increase the thickness and weight of above-mentioned material, bulky in actual use, not only reduces multiplying inside train
Space is sat, while increasing the complete vehicle quality of train, leads to the raising of the manufacturing cost and operating cost of train.
Therefore, how to propose a kind of Active noise control system, the noise in train can be controlled, to reduce column
Interior noise becomes industry important topic urgently to be resolved.
Summary of the invention
For the defects in the prior art, the embodiment of the present invention provide a kind of Active noise control system based on seat and
Noise initiative control method.
On the one hand, the embodiment of the present invention proposes a kind of Active noise control system based on seat, including seat and noise
Control device, in which:
The oise damping means includes housing, loudspeaker, reference sensor and noise controller, the noise controller
It is connected respectively with the loudspeaker and the reference sensor；The reference sensor is used for acquisition noise signal, the noise
Controller is used to generate the noise elimination signal for offsetting the noise signal according to the noise signal, and the loudspeaker is used for
The noise elimination signal is issued in the housing, the housing is arranged on the seat.
On the other hand, the embodiment of the present invention provides a kind of noise master using described in any of the above-described embodiment based on seat
The noise initiative control method of autocontrol system, comprising:
Reference sensor acquisition noise signal, and by the noise signal transmission to noise controller；
The noise controller generates noise elimination signal according to the noise signal and preset noise impedance algorithm, and
The noise elimination signal is transferred to loudspeaker；
The loudspeaker issues the noise elimination signal in housing, so that the noise elimination signal and the noise signal exist
It is superimposed in the housing, reduces the noise in the housing.
Active noise control system and noise initiative control method provided in an embodiment of the present invention based on seat, including seat
Chair and oise damping means, oise damping means include housing, loudspeaker, reference sensor and noise controller, noise control
Device is connected with loudspeaker and reference sensor respectively, and reference sensor is used for acquisition noise signal, and noise controller is used for basis
Noise signal generates the noise elimination signal for offsetting noise signal, and loudspeaker is arranged for issuing noise elimination signal, housing in seat
On, noise elimination signal and noise signal are overlapped in housing, reduce the noise in housing.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the structural schematic diagram for the Active noise control system based on seat that one embodiment of the invention provides；
Fig. 2 a is the schematic front view for the Active noise control system based on seat that one embodiment of the invention provides；
Fig. 2 b is the schematic side view for the Active noise control system based on seat that one embodiment of the invention provides；
Fig. 3 is the flow diagram for the noise initiative control method that one embodiment of the invention provides；
Fig. 4 be another embodiment of the present invention provides noise initiative control method flow diagram.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached in the embodiment of the present invention
Figure, technical solution in the embodiment of the present invention are explicitly described, it is clear that described embodiment is a part of the invention
Embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making wound
Every other embodiment obtained under the premise of the property made labour, shall fall within the protection scope of the present invention.
The principle of noise impedance (Active Noise Control, abbreviation ANC): a kind of sound is constructed, the sound
With the noise amplitude equal phase to be eliminated on the contrary, according to sound wave principle of stacking, two amplitudes are identical but the sound wave of opposite in phase
It is overlapped mutually, there is subtractive effect, ANC is eliminated or subtracted by the way that the sound opposite with former noisy amplitude equal phase is added
Weak original noise.Active noise control system provided in an embodiment of the present invention based on seat, the purpose is to by drawing for seat
Enter noise impedance technology, increases a housing on the seat, inhibit the noise of the head zone of seat, to improve noise
Comfort level.
It is understood that can all install seat on the vehicles such as train, aircraft, all there are problems that inhibiting noise,
Therefore, the Active noise control system provided in an embodiment of the present invention based on seat can be applied to the traffic work such as high-speed rail, aircraft
On tool, only carried out by taking the seat being mounted in high-speed rail as an example to clearly describe the following embodiment of technical solution of the present invention
Explanation.
Fig. 1 is the structural schematic diagram for the Active noise control system based on seat that one embodiment of the invention provides, Fig. 2 a
For the schematic front view for the Active noise control system based on seat that one embodiment of the invention provides, Fig. 2 b is that the present invention one is real
The schematic side view that the Active noise control system based on seat of example offer is provided, shown in a and Fig. 2 b as shown in Figure 1, Figure 2, the present invention
The Active noise control system based on seat that embodiment provides, including seat 1 and oise damping means, in which:
The oise damping means includes housing 2, loudspeaker, reference sensor and noise controller, the noise control
Device is connected with the loudspeaker and the reference sensor respectively；The reference sensor is used for acquisition noise signal, described to make an uproar
Audio controller is used to generate the noise elimination signal for offsetting the noise signal according to the noise signal, and the loudspeaker is used for
The noise elimination signal is issued in housing 2, housing 2 is arranged on seat 1.
Specifically, in order to inhibit the noise of seat head zone, comfort level by bus is improved, housing is set on seat 1
2, housing 2 can be installed on seat 1 by slotting on seat 1 and housing 2, the wall thickness of housing 2 is, for example, 80mm, housing
2 be hollow structure, and when the passenger normally sits on seat 1, the head of the passenger is located in housing 2, and housing 2 is used as institute
The cabinet for stating loudspeaker is conducive to eliminate the noise signal in housing 2, improves the comfort level that passenger takes；In addition, housing
2 increase the privacy of the passenger.The reference sensor can use microphone, the noise for acquisition noise driving source
Signal, and the noise signal that acquisition obtains is sent to the noise controller.The noise controller may be mounted at seat 1
Chassis interior, the noise controller can use Dspace controller, according to the noise signal and noise received
Algorithm of Active Control generates noise elimination signal, and the noise elimination signal is the signal opposite with the noise signal amplitude equal phase,
Then the noise elimination signal is transferred to the loudspeaker, the loudspeaker is made to issue noise elimination signal, the noise in housing 2
Signal and the noise elimination signal are superimposed in housing 2, reduce the noise in housing 2.Wherein, noise impedance algorithm
It is preset；The loudspeaker may be mounted in housing 2, crown position when normally sitting on seat 1 positioned at the passenger；
The wall thickness of housing 2 is configured according to actual needs, and the embodiment of the present invention is without limitation；The specific structure of seat 1 is according to reality
It needs to be configured, the embodiment of the present invention is without limitation；The shape of housing 1 is configured according to actual needs, and the present invention is implemented
Example is without limitation.
Active noise control system provided in an embodiment of the present invention based on seat, including seat and oise damping means,
Oise damping means includes housing, loudspeaker, reference sensor and noise controller, noise controller respectively with loudspeaker and ginseng
It examines sensor to be connected, reference sensor is used for acquisition noise signal, and noise controller is used to be generated according to noise signal for supporting
The noise elimination signal of de-noising acoustical signal, loudspeaker are arranged for issuing noise elimination signal, housing on the seat, by noise signal and noise elimination
Signal is overlapped in housing, and noise elimination signal and noise signal are overlapped in housing, reduces the noise in housing.
In addition, oise damping means will not influence the structure of the vehicles such as train, aircraft, noise reduction cost is reduced.
On the basis of the various embodiments described above, further, housing 2 be arranged in seat 1 by back, the structure of seat 1
Less, input cost is few, easy to accomplish for variation.
On the basis of the various embodiments described above, further, housing 2 includes two symmetrically arranged resonant cavities, Mei Gesuo
It states and a loudspeaker is set in resonant cavity, cabinet of the resonant cavity as the loudspeaker is conducive to the loudspeaker
The noise elimination signal of low frequency is issued, to eliminate low-frequency noise, the volume of each resonant cavity can be 8.5L, can guarantee to drop
It makes an uproar effect.Wherein, the shape of the resonant cavity is configured according to actual needs, and the embodiment of the present invention is without limitation；It is described total
The wall thickness of vibration chamber can be set to 5mm；The loudspeaker can be using ultrathin type, to reduce the thickness of housing 2.
On the basis of the various embodiments described above, further, the top of housing 2 is arranged in the resonant cavity, is located at described
The crown position of the normal sitting position of passenger, the noise elimination signal spread out of from the resonant cavity are conducive to close to the ear of the passenger
Guarantee noise reduction effect.
On the basis of the various embodiments described above, further, sound-absorbing material, the sound absorption material is arranged in the inner wall of the housing
Material can be pasted on the inner wall of the housing, for inhibiting high-frequency noises, further reduced the noise in housing.Its
In, the thickness of the sound-absorbing material can be set to 40mm.
On the basis of the various embodiments described above, further, the noise controller uses Dspace controller, according to connecing
The noise signal and noise impedance algorithm received generates noise elimination signal, and the loudspeaker is made to issue the noise elimination letter
Number, so that the noise signal and the noise elimination signal are overlapped in housing 2.
On the basis of the various embodiments described above, further, the reference sensor has multiple, is separately positioned on seat 1
On housing 2.Multiple institutes are arranged for obtaining the noise signal of different location around seat respectively in multiple reference sensors
State detection accuracy and noise impedance precision that reference sensor is conducive to improve the noise signal.Wherein, multiple described
The specific installation site of reference sensor is configured according to actual needs, and the embodiment of the present invention is without limitation；The reference passes
The quantity of sensor is configured according to actual needs, and the embodiment of the present invention is without limitation.
For example, a reference sensor can be arranged in the top outer of housing 2, in two sides of housing 2 point
Not She Zhi a reference sensor, on the outside of the backrest of seat 1 close to housing 2 bottom be arranged two it is described with reference to sensing
Device is arranged two reference sensors on the outside of the backrest of seat 1 at floor, sets on the outside of each handrail of seat 1
Set the reference sensor.
Fig. 3 is the flow diagram for the noise initiative control method that one embodiment of the invention provides, as shown in figure 3, this hair
The noise using the Active noise control system described in any of the above-described embodiment based on seat that bright embodiment provides actively is controlled
Method processed, comprising:
S301, reference sensor acquisition noise signal, and by the noise signal transmission to noise controller；
Specifically, high-speed rail can issue noise at runtime, and reference sensor can acquire acquisition noise signal, then by institute
It states noise signal and is sent to noise controller.Wherein, the reference sensor can use microphone.
S302, the noise controller generate letter of eliminating the noise according to the noise signal and preset noise impedance algorithm
Number, and the noise elimination signal is transferred to loudspeaker；
Specifically, after the noise controller receives the noise signal, according to the noise signal and noise master
Dynamic control algolithm generates noise elimination signal, then the noise elimination signal disappears for eliminating or weakening the noise signal by described
Acoustical signal is transferred to loudspeaker.Wherein, the noise elimination signal is, the signal of opposite in phase identical as the noise signal waveforms；
The noise impedance algorithm is preset.
For example, the noise signal is x (n), the noise elimination signal is y (n), y (n)=wT(n) x (n), wherein w (n)
For the weight coefficient of the noise impedance algorithm, wTIt (n) is the transposition of the weight coefficient of the noise impedance algorithm.It is described
Noise impedance algorithm is according to formula w (n+1)=(1- α) w (n)+α xT(n) f (n), to the noise impedance algorithm
Weight coefficient is adjusted, wherein w (n+1) indicates that the weight coefficient of the noise impedance algorithm at n+1 moment, w (n) indicate n
The weight coefficient of the noise impedance algorithm at moment, α indicate the convergence coefficient of the noise impedance algorithm, x (n) table
Show the noise signal at n moment, xT(n) indicate that the transposition of the noise signal at n moment, f (n) indicate the filtering at n moment
Device coefficient；Wherein, f (n) is selected from filter coefficient intersection according to x (n), and the filter coefficient intersection is to build in advance
Vertical.
S303, the loudspeaker issue the noise elimination signal in housing, so that the noise elimination signal and the noise
Signal is superimposed in housing, reduces the noise in the housing.
Specifically, after the loudspeaker receives the noise elimination signal, the noise elimination signal is issued in housing, it is described
The noise signal and the noise elimination signal in housing are superimposed, to reduce the noise in the housing.
Noise initiative control method provided in an embodiment of the present invention, reference sensor acquisition noise signal, and noise is believed
It number is transferred to noise controller, noise controller generates letter of eliminating the noise according to noise signal and preset noise impedance algorithm
Number, and noise elimination signal is transferred to loudspeaker；Loudspeaker issues noise elimination signal in housing, so that noise elimination signal and noise are believed
It number is superimposed in housing, reduces the noise in housing.
On the basis of the various embodiments described above, further, the noise impedance algorithm according to formula w (n+1)=
(1-α)w(n)+αxT(n) f (n) is adjusted the weight coefficient of the noise impedance algorithm, wherein w (n+1) indicates n+
The weight coefficient of the noise impedance algorithm at 1 moment, w (n) indicate the power system of the noise impedance algorithm at n moment
Number, α indicate that the convergence coefficient of the noise impedance algorithm, x (n) indicate the noise signal at n moment, xT(n) n is indicated
The transposition of the noise signal at moment, f (n) indicate the filter coefficient at n moment；Wherein, f (n) is according to x (n) from filter
It is selected in coefficient intersection, the filter coefficient intersection pre-establishes.
Specifically, since the Active noise control system used in the embodiment of the present invention based on seat is not passed using error
Sensor, so the noise impedance algorithm and FXLMS algorithm in the prior art are different, the noise impedance
Algorithm is according to formula w (n+1)=(1- α) w (n)+α xT(n) f (n) adjusts the weight coefficient of the noise impedance algorithm
It is whole, wherein w (n+1) indicates that the weight coefficient of the noise impedance algorithm at n+1 moment, w (n) indicate that the described of n moment is made an uproar
The weight coefficient of sound Algorithm of Active Control, α indicate that the convergence coefficient of the noise impedance algorithm, x (n) indicate the institute at n moment
State noise signal, xT(n) indicate that the transposition of the noise signal at n moment, f (n) indicate the filter coefficient at n moment, f (n)
It is selected from filter coefficient intersection according to x (n), the filter coefficient intersection pre-establishes.Wherein, w (0)=
A-1B, A=E [x (0) xT(0)], B=E [x (0) dT(0)], x (0) indicates the noise signal at 0 moment, xT(0) indicated for 0 moment
The noise signal transposition, d (0) indicate include noise original signal, dT(0) original signal comprising noise is indicated,
Acquisition can be tested, E [] indicates desired value.
Fig. 4 be another embodiment of the present invention provides noise initiative control method flow diagram, as shown in figure 4, institute
Filter coefficient intersection is stated to obtain in the following way:
S401, under a variety of typical conditions, acquisition obtains the between the reference sensor and error pick-up respectively
One transmission function；Wherein, the error pick-up is preconfigured；
Specifically, Active noise control system in the prior art, error pick-up are essential, detection error letters
Number.But if step-up error sensor on the seat, moveing freely for head of passenger will limit, reduce riding comfort.This
The noise initiative control method that inventive embodiments provide needs to remove error pick-up in practical applications in a variety of typical cases
Under operating condition, acquisition obtains the first transmission function between the reference sensor and error pick-up respectively.Wherein, the error
Sensor is to be pre-configured with the Active noise control system based on seat, accurate in order to obtain the error pick-up
The head zone of the seat can be arranged in the error pick-up by error signal；Obtaining first transmission function
When, noise controller uses adaptive FXLMS algorithm in the prior art；The typical condition is set according to the actual situation
It sets, the embodiment of the present invention is without limitation.
For example, the Active noise control system based on seat is configured in high-speed rail, according to the difference of the high-speed rail
Speed, different acceleration, there are many typical conditions by the operation of high-speed rail for different road conditions (overhead, tunnel etc.) etc..Every
Under the kind typical condition, acquisition obtains the first transmission function Ref between the reference sensor and the error pick-up.
Assuming that 9 reference sensors of configuration and 2 error pick-ups, 9 reference sensors are passed to 2 errors
There are 18 transmission paths between sensor, the noise controller analyzes the path of 18 transmission paths based on FXLMS algorithm
After transmission function, the first transmission function Ref between the reference sensor and the error pick-up can be obtained.Wherein,
The typical condition is configured based on practical experience, and the embodiment of the present invention is without limitation.
S402, the second transmitting letter under static operating condition, between the acquisition acquisition loudspeaker and the error pick-up
Number, and acquire the third transmission function obtained between the loudspeaker and the reference sensor；
Specifically, noise initiative control method provided in an embodiment of the present invention in order to remove error sensing in practical applications
Device, it is also necessary under static operating condition, acquisition obtains the second transmission function between the loudspeaker and the error pick-up, and
Acquisition obtains the third transmission function between the loudspeaker and the reference sensor.Obtain second transmission function and
When the third transmission function, noise controller uses adaptive FXLMS algorithm in the prior art；
For example, configuring the Active noise control system based on seat in high-speed rail, it is in static in the high-speed rail
Under state, acquisition obtains the second transmission function Sef between the loudspeaker and the error pick-up, and acquires described in acquisition
Third transmission function Re between loudspeaker and the reference sensor.Assuming that 9 reference sensors of configuration, described in 2
Error pick-up and 2 loudspeakers, 2 loudspeakers to 4 transmitting roads of formation between 2 error pick-ups
Diameter after the noise controller analyzes the path transfer function of 4 transmission paths based on FXLMS algorithm, can obtain described
The second transmission function Sef between loudspeaker and the error pick-up；Similarly, 2 thus loudspeaker to 9 it is described with reference to pass
18 transmission paths are formed between sensor, the noise controller analyzes the path of 18 transmission paths based on FXLMS algorithm
After transmission function, the third transmission function Re between the loudspeaker and the reference sensor can be obtained.
S403, according to the first transmission function under typical condition described in every kind, the second transmitting letter under the static operating condition
Several and third transmission function, obtains the filter coefficient under every kind of typical condition respectively；
Specifically, second in the case where obtaining the first transmission function under the various typical conditions, the static disclosure passes
After delivery function and third transmission function, according under typical condition described in every kind the first transmission function, under the static operating condition
The second transmission function and third transmission function, the filter coefficient under every kind of typical condition can be obtained.
For example, configuring the Active noise control system based on seat in high-speed rail, the high-speed rail is obtained with speed
The first transmission function Ref1 between the reference sensor and the error pick-up under the operating condition of a process of passing through tunnel b is spent, and
Second transmission function Sef1 and third transmission function Re1 of the high-speed rail under static operating condition are obtained, the high-speed rail is with speed a
Filter coefficient f=Ref1+Sef1+Re1 under the operating condition of process of passing through tunnel b.
S404, the reference under the filter coefficient under every kind of typical condition and every kind of typical condition is passed
The value range for the noise signal that sensor obtains is corresponding, obtains the filter coefficient intersection.
Specifically, for typical condition described in every kind, the noise signal of the reference sensor acquisition can all have one
Fixed value range, by the value range of the noise signal under every kind of typical condition and every kind of typical condition pair
It answers, every kind of typical condition all corresponds to a filter coefficient, by the value model of noise signal under every kind of typical condition
It encloses corresponding with the filter coefficient, obtains the filter coefficient intersection.If the noise of the reference noise signal acquisition
Signal is located in corresponding value range, illustrates that current operating condition is in the corresponding operating condition of the value range, by the value model
Respective filter coefficient is enclosed, as filter coefficient corresponding with the noise signal, then can believe according to the noise
Number select corresponding filter coefficient.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
1. a kind of Active noise control system based on seat, which is characterized in that including seat and oise damping means, in which:
The oise damping means includes housing, loudspeaker, reference sensor and noise controller, the noise controller difference
It is connected with the loudspeaker and the reference sensor；The reference sensor is used for acquisition noise signal, the noise control
Device is used to generate the noise elimination signal for offsetting the noise signal according to the noise signal, and the loudspeaker is used for described
The noise elimination signal is issued in housing, the housing is arranged on the seat.
2. system according to claim 1, which is characterized in that the housing be arranged in the seat by back.
3. system according to claim 1, which is characterized in that the housing includes two symmetrically arranged resonant cavities, often
One loudspeaker is set in a resonant cavity.
4. system according to claim 3, which is characterized in that the top of the housing is arranged in the resonant cavity.
5. system according to claim 1, which is characterized in that sound-absorbing material is arranged in the inner wall of the housing.
6. system according to claim 1, which is characterized in that the noise controller uses Dspace controller.
7. system according to any one of claims 1 to 6, which is characterized in that the reference sensor has multiple, sets respectively
It sets on the seat and the housing.
8. a kind of noise using the Active noise control system as described in any one of claim 1 to 7 based on seat is actively
Control method characterized by comprising
Reference sensor acquisition noise signal, and by the noise signal transmission to noise controller；
The noise controller generates noise elimination signal according to the noise signal and preset noise impedance algorithm, and by institute
It states noise elimination signal and is transferred to loudspeaker；
The loudspeaker issues the noise elimination signal in housing, so that the noise elimination signal is with the noise signal described
It is superimposed in housing, reduces the noise in the housing.
9. according to the method described in claim 8, it is characterized in that, the noise impedance algorithm according to formula w (n+1)=
(1-α)w(n)+αxT(n) f (n) is adjusted the weight coefficient of the noise impedance algorithm, wherein w (n+1) indicates n+
The weight coefficient of the noise impedance algorithm at 1 moment, w (n) indicate the power system of the noise impedance algorithm at n moment
Number, α indicate that the convergence coefficient of the noise impedance algorithm, x (n) indicate the noise signal at n moment, xT(n) n is indicated
The transposition of the noise signal at moment, f (n) indicate the filter coefficient at n moment；Wherein, f (n) is according to x (n) from filtering
It is selected in device coefficient intersection, the filter coefficient intersection pre-establishes.
10. according to the method described in claim 9, it is characterized in that, the filter coefficient intersection obtains in the following way:
Under a variety of typical conditions, acquisition obtains the first transmitting letter between the reference sensor and error pick-up respectively
Number；Wherein, the error pick-up is preconfigured；
Under static operating condition, acquisition obtains the second transmission function between the loudspeaker and the error pick-up, and acquires
Obtain the third transmission function between the loudspeaker and the reference sensor；
It is passed according to the first transmission function under a variety of typical conditions, the second transmission function under the static operating condition and third
Delivery function obtains the filter coefficient under every kind of typical condition respectively；
The reference sensor under filter coefficient and every kind of typical condition under every kind of typical condition is obtained
Noise signal value range it is corresponding, obtain the filter coefficient intersection.
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Application publication date: 20190517 |