CN106593578B - A kind of automobile noise Active Control Method and device - Google Patents
A kind of automobile noise Active Control Method and device Download PDFInfo
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- CN106593578B CN106593578B CN201611071415.3A CN201611071415A CN106593578B CN 106593578 B CN106593578 B CN 106593578B CN 201611071415 A CN201611071415 A CN 201611071415A CN 106593578 B CN106593578 B CN 106593578B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005086 pumping Methods 0.000 claims abstract description 13
- 230000005540 biological transmission Effects 0.000 claims description 42
- 238000007493 shaping process Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 2
- 238000011161 development Methods 0.000 abstract description 5
- 230000006870 function Effects 0.000 description 32
- 238000013461 design Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 4
- 230000003584 silencer Effects 0.000 description 4
- 230000003044 adaptive effect Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 230000003190 augmentative effect Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 241000135164 Timea Species 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000003416 augmentation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/06—Silencing apparatus characterised by method of silencing by using interference effect
- F01N1/065—Silencing apparatus characterised by method of silencing by using interference effect by using an active noise source, e.g. speakers
Abstract
The embodiment of the present invention provides a kind of automobile noise active control device and method.Wherein, device includes: control unit and the executing agency that is connected with control unit；Control unit includes reference signal acquiring unit, operating condition judging unit, by calibrated filter；Reference signal acquiring unit, for obtaining reference signal relevant to automobile noise, reference signal is obtained according to engine speed and load information；Operating condition judging unit, for determining current working according to reference signal and selecting corresponding filter；Filter, for generating pumping signal according to reference signal and exporting to executing agency after chosen；Structure is executed, for generating secondary voice output according to pumping signal.The master that apparatus of the present invention can simplify in conventional muffler disappears part, reduces exhaust system and takes up space and complexity, and to different automobile types, need to only be re-scaled, update control unit, the development cycle is obviously shortened, suitable Development of Modular.
Description
Technical field
The invention belongs to eliminate field of noise more particularly to a kind of automobile noise removing method and dress based on active control
It sets.
Background technique
Existing automotive muffler mostly uses passive type to eliminate the noise, and volume is big, and space hold is excessive, designs and develops the period
It is long.And it is directed to the silencer of variety classes such as different displacements, layout, form of silencer etc. all need to redesign.
And the feedforward active noise control device of subsequent development, it is input in filter by acquiring reference signal, and tie
It closes the error signal at control point and then obtains the elimination that secondary signal output carries out noise.In this device, reference signal with
Error signal generallys use microphone acquisition, since exhaust system working environment is complicated, severe, thus to the durable of microphone
Property, reliability requirement are very high, increase system cost.And feed-forward signal takes acoustic signal, can generate secondary acoustic feedback, shadow
Acoustic system stability.In addition, exhaust sound quality is often fixed after muffler desing molding, it is not able to satisfy different drivers couple
The preference of sound quality.
Summary of the invention
It is in the prior art to solve the purpose of the present invention is to provide a kind of automobile noise Active Control Method and device
Muffler volume is big, and needs using the various problems of microphone bring.
The invention discloses a kind of automobile noise active control device, described device includes:
Control unit and the executing agency being connected with described control unit；
Described control unit includes reference signal acquiring unit, operating condition judging unit, by calibrated filter；
The reference signal acquiring unit, it is described with reference to letter for obtaining reference signal relevant to the automobile noise
It number is obtained according to engine speed and load information；
The operating condition judging unit, for determining current working according to the reference signal and selecting corresponding filter；
The filter, for generating pumping signal according to the reference signal and exporting to the execution after chosen
Mechanism；
The execution structure, for generating secondary voice output according to the pumping signal.
Preferably, parameter of the filter under different operating conditions passes through to primary channel transmission function and secondary channel biography
The preparatory calibration of delivery function determines.
Preferably, described device further includes calibration unit, and the calibration unit includes:
Operating condition selecting unit, primary channel calibration unit, secondary channel calibration unit, filter parameter determination unit and
Error microphone:
The operating condition selecting unit, for selecting a certain operating condition as calibration environment；
The primary channel demarcates unit, for establishing reference signal model relevant to engine speed and load information
And the parameter of reference signal model is determined to obtain primary channel transmission function according to experimental result；
The primary channel demarcates unit, for according to the signal obtained from the execution structure and from the error wheat
The error signal that gram wind obtains obtains secondary channel transmission function；
Filter parameter determination unit, for according to the primary channel transmission function and the secondary channel transmission function
Determine the filter parameter under corresponding operating condition.
Preferably, described device further includes Properties Control weight filter, for combining the first control target pair of setting
The error signal carries out frequency-domain shaping control.
Preferably, described device further includes robust weighting filter, for combining the second control target of setting to secondary
Channel transfer function is modified.
Another aspect of the present invention also discloses a kind of automobile noise Active Control Method, applies in above-mentioned device, institute
The method of stating includes:
The reference signal acquiring unit obtains reference signal relevant to the automobile noise, the reference signal according to
Engine speed and load information obtain；
The operating condition judging unit determines current working according to the reference signal and selects corresponding filter；
The filter generates pumping signal according to the reference signal and exports to the executing agency after chosen；
The execution structure generates secondary voice output according to the pumping signal.
Preferably, parameter of the filter under different operating conditions is by primary channel transmission function and secondary channel
The preparatory calibration of transmission function determines.
Preferably, described device further includes calibration unit, and the calibration unit includes: operating condition selecting unit, primary channel
Demarcate unit, secondary channel calibration unit, filter parameter determination unit and error microphone:
The operating condition selecting unit selects a certain operating condition as calibration environment；
The primary channel calibration unit establishes reference signal model relevant to engine speed and load information and root
The parameter of reference signal model is determined according to experimental result to obtain primary channel transmission function；
Primary channel calibration unit executes signal that structure obtains and from the error microphone according to from described
The error signal of acquisition obtains secondary channel transmission function；
The filter parameter determination unit is according to the primary channel transmission function and the secondary channel transmission function
Determine the filter parameter under corresponding operating condition.
Preferably, described device further includes Properties Control weight filter；
The first control target that can control weight filter combination setting carries out frequency-domain shaping to the error signal
Control.
Preferably, described device further includes robust weighting filter；
The robust weighting filter combines the second control target of setting to be modified secondary channel transmission function.
The part the utility model has the advantages that master that can be simplified in conventional muffler using control device of the invention is disappeared, reduces exhaust system
System takes up space and manufacture craft difficulty.
It to the vehicle of different displacements, need to only be re-scaled, update control unit, therefore active silencer has
Certain versatility, development cycle are obviously shortened, and are suitble to Development of Modular.
The error microphone in traditional active noise control system is removed, solves microphone in exhaust system harsh
Bad adaptability and the problems such as poor durability in environment, saves the cost of whole system component, ensure that the stabilization of system is lasting
Work, the popularization of suitable system.
Reference signal chooses the engine speed and load information of ECU, rather than acoustic sensor picks up, and can effectively eliminate
The influence of secondary acoustic feedback.It avoids having used with reference to microphone simultaneously, solves microphone in exhaust system harsh environments
The disadvantages of middle bad adaptability and poor durability.
Further, by increasing Properties Control weight filter W1(n) and control target z1(n), residual signals are carried out
Frequency-domain shaping meets the needs of different clients and vehicle attribute to design preferred exhaust tail voice quality.By increasing by one
A robust weighting filter W2(n) and control target z2(n), it can control the influence of secondary channel modeling error, it is non-adaptive to meet
The robust stability of system under the conditions of answering.
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 only this
The some embodiments recorded in invention, for those of ordinary skill in the art, in the premise of not making the creative labor property
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is automobile noise active control device schematic diagram of the present invention；
Fig. 2 is automobile noise active control device structure chart of the present invention；
Fig. 3 is the calibration schematic diagram of primary channel transmission function of the present invention；
Fig. 4 is the calibration schematic diagram of secondary channel transmission function in the present invention；
Fig. 5 is that feedforward control device shows structure chart in the present invention；
Fig. 6 is feedforward control augmentation structure drawing of device in the present invention；
Fig. 7 is automobile noise active control flow chart of the present invention；
Fig. 8 is the working condition calibration flow diagram before automobile noise active control of the present invention.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without creative efforts, all should belong to protection of the present invention
Range.
The invention discloses a kind of automobile noise active control device, described device includes the control increased in exhaust system
Unit 1 processed and executing agency 2, as shown in Figure 1.Control unit determines current fortune by reading engine speed and load information
Row operating condition, the filter stored after calibration in selection control memory, and then calculate the executing agency at each moment (secondary is raised
Sound device) pumping signal, so that it is generated secondary sound at control point and be superimposed with primary noise, to reach the mesh for reducing exhaust noise
, frequency of noise elimination is mainly in 100-500Hz.
As shown in Fig. 2, the control unit includes reference signal acquiring unit 11, operating condition judging unit 12, warp
Cross calibrated filter 13；
The reference signal acquiring unit 11, for obtaining reference signal relevant to the automobile noise, the reference
Signal is obtained according to engine speed and load information；
The operating condition judging unit 12, for determining current working according to the reference signal and selecting corresponding filtering
Device；
The filter 13, for being exported according to reference signal generation pumping signal to described and being held after chosen
Row mechanism；
The execution structure, for generating secondary voice output according to the pumping signal.
The present invention is feed-forward type active noise controlling scheme, and feed-forward signal uses engine speed and load information, is replaced
Acoustic sensor traditionally picks up, not only can be to avoid using microphone, but also can effectively eliminate the influence of secondary acoustic feedback.?
It in specific implementation, needs to carry out working condition calibration, and in the working condition calibration stage, increases additional error microphone at control point,
Carry out the filter optimal design under specific operation.Working condition calibration designs specific as follows with filter:
1, working condition calibration
Working condition calibration refers to that vehicle measures under main operating condition and obtains the transmission function of primary channel and secondary channel, shows
It is intended to as shown in Figure 3 and Figure 4.It needs to place an error microphone at control point position in calibration process, when due to calibration
Between short and concern eliminate the noise generally too not high in the temperature tail mouth of point, therefore do not need to have the performance of microphone too high
It is required that.Primary channel refers to reference signal sensor (engine rotational speed signal that ECU is read) at control point (error microphone)
Between channel, secondary channel refers to the channel in executing agency between sub-loudspeaker to control point, defines primary channel and pass
Delivery function is Sre(n), secondary channel transmission function is Sye(n)。
The calibration of 1.1 primary channels
When primary channel is demarcated, synthesized reference signal first is needed, by testing the result with theory analysis it is found that exhaust tail
The noise of mouth is mainly contributed by engine and transmission system, and frequency and engine speed at engine noise major peaks
It is directly related, therefore by acquisition engine rotational speed signal, reference signal can be constructed.By Fourier space it is found that with reference to
Signal has following citation form:
X (t)=A1cos(2πf1t)+A2cos(2πf2t)+A3cos(2πf3t)+…+Ancos(2πfnt)+…
T refers to time series in formula, can be time zero, f by engine start moment definitioni, i=1,2 ..., n refers to
Harmonic frequency, Ai, i=1,2 ..., n refers to the amplitude of nth harmonic.For different displacements engine, n takes different value, such as four
Cylinder engine, engine noise are mainly contributed by its second order, quadravalence and six order harmonics, higher than the high-order harmonic wave contribution amount of six ranks
It is very small, therefore above formula can only get first three items, i.e., it is believed that:
X (t)=A1cos(2πf1t)+A2cos(2πf2t)+A3cos(2πf3t)
Wherein A1、A2And A3Value can by experiment determine.
After above-mentioned parameter is selected, primary channel transmission function can be demarcated.Error microphone is placed on control point, it is desirable that
The ratio between both reference signal sensor and error microphone sample simultaneously, and gained sample sequence is asked spectral density function, then carry out
Inverse Fourier transform seeks time domain filtering.Reference signal is synthesized by engine rotational speed signal, in order to obtain the transmitting of entire frequency band
Function, engine acceleration as even as possible under specific load when needing to demarcate, sub-loudspeaker not sounding when demarcating primary channel,
There was only engine in system is leading primary sound source.The even acceleration of engine is equivalent to swept-frequency signal, as driving source, i.e.,
Primary channel transmission function S can be acquiredre(n).The collected engine rotational speed signal of ECU is x (n) in Fig. 3, demarcates microphone
Response signal is e (n).
The calibration of 1.2 secondary channels
Engine does not work when secondary channel is demarcated, and there was only secondary sound source (the secondary loudspeaking in executing agency in system
Device).Secondary sound source white-noise excitation signal is given, the transmission function of secondary channel is obtained using the method for adaptive channel identification
Sye(n).As shown in figure 4, wherein u (t) is a white Gaussian noise signal, x ' (n) is received its functional block diagram for sub-loudspeaker
Signal, d ' (n) be the received desired signal of error microphone.Then the weight of sef-adapting filter is realized using LMS algorithm
Coefficient update may make that error signal e ' (n) energy is minimum, sef-adapting filter weight coefficient stops if algorithmic statement
It updates, using at this timeAs the transfer-function coefficient of secondary channel, wherein L is previously selected
Secondary channel transmission function order.
According to the description of above-mentioned calibration process it is found that described device further includes calibration unit, the calibration unit includes:
Operating condition selecting unit, primary channel calibration unit, secondary channel calibration unit, filter parameter determination unit and
Error microphone.
The operating condition selecting unit, for selecting a certain operating condition as calibration environment.The primary channel demarcates unit, uses
In foundation reference signal model relevant to engine speed and load information and reference signal model is determined according to experimental result
Parameter to obtain primary channel transmission function.The primary channel demarcates unit, for obtaining according to from the execution structure
Signal and from the error microphone obtain error signal obtain secondary channel transmission function.Filter parameter determines single
Member, for determining that the filter under corresponding operating condition is joined according to the primary channel transmission function and the secondary channel transmission function
Number.
2, the design of optimal filter
Feed-forward type active noise control system proposed by the present invention is as shown in figure 5, with traditional active noise control system phase
Than eliminating reference microphone and error microphone.
In the preferred embodiment of the present invention, system shown in Figure 5 can be converted into augmented system shown in fig. 6.The augmented system
Increase a Properties Control weight filter W1(n) and control target z1(n) and a robust weighting filter W2(n) it and controls
Target z processed2(n).Properties Control weight filter W1(n) and control target z1(n) whole for carrying out frequency domain to systematic error signal
Shape control by carrying out shaping to filter, and then controls exhaust tail voice quality, not only meets overall sound pressure level requirement, may be used also
To adjust specific gravity shared by order etc., to meet the needs of different clients are to vehicle.It is different according to control target, such as difference
It is required that sound quality, different W may be selected1(n), W is selected here1It (n) is the equal of the power spectral density of A weighted sound pressure level disturbance
Root value can make the A weighted sound pressure level of residual noise signal minimum in this way, more meet the auditory properties of people.Certainly, W1
(n) it also can choose the control filter of other acoustics index such as loudness, speech articulation, roughness.It should be noted that property
Can control weight filter and control target be all it is virtual, be only used for design controller Wopt(n), in systems in practice simultaneously, do not have
There is corresponding signal.Robust weighting filter W2(n) it is built with control target for the controllable secondary channel of Design of Robustness Stability
The influence of mould error, with meet it is non-adaptive under the conditions of system robust stability.Obtaining primary channel transmission function Sre(n)
With secondary channel transmission function Sre(n) after, optimal controller W can be carried out with robust control theoryopt(n) design.
In above scheme of the present invention, due to reducing the use of reference microphone and error microphone, exhaust master is increased
Reliability, the realizability of moving noise, the complicated severe working environment of exhaust system can not be adapted to by solving microphone, and be avoided
The influence of secondary acoustic feedback in conventional feed forward active noise control device.And which simplify the structure of conventional muffler,
To reduce the back pressure loss as caused by silencer, and then improve engine performance.In addition, the reduction of component leads exhaust
Moving noise control device cost reduces.
The application of exhaust active noise control device reduces the occupied space of exhaust system, easily facilitates chassis and sets
Meter.The quality of exhaust system is reduced simultaneously, is designed convenient for automotive light weight technology.
The device has stronger adaptability, for different model engine, need to only be re-scaled, it is single to update control
First parameter, thus the achievable modularized production of the device reduce design research and development cost.
Corresponding above-mentioned apparatus, another aspect of the present invention also disclose a kind of automobile noise Active Control Method, apply upper
In the device stated, as shown in Figure 7, which comprises
After process starts, vehicle operation carries out the pickup of ECU signal, and determines accordingly operating condition, such as determines
Operating condition then filter is selected accordingly in the operating condition of storage, and generate corresponding corresponding signal and executing agency sent out
Sound.If the operating condition of judgement is before without calibrated, then EP (end of program).
The present invention is feed-forward type active noise controlling scheme, and feed-forward signal uses engine speed and load information, is replaced
Acoustic sensor traditionally picks up, not only can be to avoid using microphone, but also can effectively eliminate the influence of secondary acoustic feedback.?
It in specific implementation, needs to carry out working condition calibration, and in the working condition calibration stage, increases additional error microphone at control point,
Carry out the filter optimal design under specific operation.Working condition calibration is with filter design procedure as shown in figure 8, detailed description can join
See Installation practice, details are not described herein again.
In the preferred embodiment of the present invention, it can also increase Properties Control and robust stability control.
Specifically, described device further includes Properties Control weight filter and robust weighting filter.It is described to can control power
First control target of value filter combination setting carries out frequency-domain shaping control to the error signal.The robust weighted filtering
Device combines the second control target of setting to be modified secondary channel transmission function.
Although depicting the present invention by embodiment, it will be appreciated by the skilled addressee that the present invention there are many deformation and
Variation is without departing from spirit of the invention, it is desirable to which the attached claims include these deformations and change without departing from of the invention
Spirit.
Claims (8)
1. a kind of automobile noise active control device, which is characterized in that described device includes:
Control unit, the executing agency being connected with described control unit, calibration unit；
Described control unit includes reference signal acquiring unit, operating condition judging unit, by calibrated filter；
The reference signal acquiring unit, for obtaining reference signal relevant to the automobile noise, the reference signal root
It is obtained according to engine speed and load information；
The operating condition judging unit, for determining current working according to the reference signal and selecting corresponding filter；
The filter, for generating pumping signal according to the reference signal and exporting to the executing agency after chosen,
Parameter of the filter under different operating conditions passes through the preparatory mark to primary channel transmission function and secondary channel transmission function
It is fixed to determine；
The execution structure, for generating secondary voice output according to the pumping signal；
The calibration unit includes operating condition selecting unit, primary channel calibration unit, secondary channel calibration unit, filter parameter
Determination unit and error microphone,
The operating condition selecting unit, for selecting a certain operating condition as calibration environment；
The primary channel demarcates unit, for establishing reference signal model relevant to engine speed and load information and root
The parameter of reference signal model is determined according to experimental result to obtain primary channel transmission function；
The primary channel demarcates unit, for according to the signal obtained from the execution structure and from the error microphone
The error signal of acquisition obtains secondary channel transmission function；
Filter parameter determination unit, for being determined according to the primary channel transmission function and the secondary channel transmission function
Filter parameter under corresponding operating condition.
2. automobile noise active control device as described in claim 1, which is characterized in that described device further includes Properties Control
Weight filter carries out frequency-domain shaping control to the error signal for the first control target in conjunction with setting.
3. automobile noise active control device as described in claim 1, which is characterized in that described device further includes robust weighting
Filter, for combining the second control target of setting to be modified secondary channel transmission function.
4. a kind of automobile noise Active Control Method, is applied in device as claimed in any one of claims 1-3, feature
It is, which comprises
The reference signal acquiring unit obtains reference signal relevant to the automobile noise, and the reference signal is according to starting
Machine revolving speed and load information obtain；
The operating condition judging unit determines current working according to the reference signal and selects corresponding filter；
The filter generates pumping signal according to the reference signal and exports to the executing agency after chosen；
The execution structure generates secondary voice output according to the pumping signal.
5. automobile noise Active Control Method as claimed in claim 4, which is characterized in that the filter is under different operating conditions
Parameter be to be determined by preparatory calibration to primary channel transmission function and secondary channel transmission function.
6. automobile noise Active Control Method as claimed in claim 5, which is characterized in that described device further includes that calibration is single
Member, the calibration unit include: operating condition selecting unit, primary channel calibration unit, secondary channel calibration unit, filter parameter
Determination unit and error microphone；
The operating condition selecting unit selects a certain operating condition as calibration environment；
The primary channel calibration unit establishes reference signal model relevant to engine speed and load information and according to reality
It tests result and determines the parameter of reference signal model to obtain primary channel transmission function；
The primary channel calibration unit is obtained according to the signal obtained from the execution structure and from the error microphone
Error signal obtain secondary channel transmission function；
The filter parameter determination unit is determined according to the primary channel transmission function and the secondary channel transmission function
Filter parameter under corresponding operating condition.
7. automobile noise Active Control Method as claimed in claim 6, which is characterized in that described device further includes Properties Control
Weight filter；
The first control target that can control weight filter combination setting carries out frequency-domain shaping control to the error signal.
8. automobile noise Active Control Method as claimed in claim 6, which is characterized in that described device further includes robust weighting
Filter；
The robust weighting filter combines the second control target of setting to be modified secondary channel transmission function.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108538304B (en) * | 2018-03-09 | 2021-10-01 | 华侨大学 | Active control system for noise in vehicle |
| CN109994098B (en) * | 2019-01-11 | 2021-02-02 | 同济大学 | Weighted noise active control method based on off-line reconstruction of secondary path |
| CN111128111B (en) * | 2019-12-18 | 2022-06-03 | 清华大学苏州汽车研究院（相城） | Variable step length feedforward control system and control method for engine active noise control |
| CN113077778B (en) * | 2020-01-03 | 2023-01-10 | 中车唐山机车车辆有限公司 | Active noise reduction system of motor train unit |
| CN112319846B (en) * | 2020-09-25 | 2022-07-19 | 中国航空工业集团公司上海航空测控技术研究所 | Parameter calibration method for aircraft engine parameter acquisition equipment |
| CN115370503B (en) * | 2022-08-30 | 2024-01-23 | 株洲时代新材料科技股份有限公司 | Engine active suspension control method based on rotation speed prediction |
| CN117690404A (en) * | 2024-02-04 | 2024-03-12 | 清华大学苏州汽车研究院（相城） | Active control method and device for engine noise of automobile |
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