Summary of the invention
The purpose of the present invention is being directed to the problems of the prior art, a kind of active noise reduction system stability test side is provided
Method.
In order to achieve the above objectives, the technical solution adopted by the present invention is that:
A kind of active noise reduction system stability test method, it is characterised in that: the test method includes the following steps:
The noise source of the active noise reduction system is obtained, the active noise reduction system exports de-noising signal according to the noise source;
Noise signal at collecting test position after active noise reduction system control, and noise signal is analyzed;
Whether judge that previous moment is differed with the sound pressure level of later moment in time is more than setting value;
If being judged as YES, the active noise reduction system is reset, makes the de-noising signal of the active noise reduction system output subsequent time;
If being judged as NO, the active noise reduction system continues to output current time de-noising signal.
Preferably, interior noise signal under various operating conditions is acquired, and noise signal under various operating conditions is integrally formed
The noise source.
Preferably, the output de-noising signal of the active noise reduction system obtains loudspeaker pumping signal through power amplification, leads to
Cross loudspeaker output.
The present invention also provides a kind of active noise reduction system system for testing stability, including electrical with the active noise reduction system
The Detection of Stability system of connection.
Preferably, the active noise reduction system includes:
Noise information obtains module, for obtaining interior noise signal under various operating conditions;
Signal constructing module is controlled, module is obtained with the noise information and is electrically connected, for the noise information to be obtained mould
The noise signal that block obtains is integrated, and noise source is obtained;
First controller module is electrically connected with the control signal constructing module, whole according to the control signal constructing module
Noise source after conjunction exports de-noising signal;
Loudspeaker module, the loudspeaker module and first controller module are electrically connected, first controller module
It exports de-noising signal and obtains loudspeaker pumping signal through power amplification, exported by the loudspeaker module;
The Detection of Stability system includes:
Noise data obtains module, for the noise signal at collecting test position after active noise reduction system control;
Data real time analysis module obtains module with the noise data and is electrically connected, for obtaining mould to the noise data
The data of block acquisition carry out processing analysis;
Information feedback module is analyzed, is electrically connected with the data real time analysis module, according to the data real time analysis module
Treated that data judges whether previous moment is differed with the sound pressure level of later moment in time more than setting value for analysis;
Second controller module is electrically connected with the analysis information feedback module and first controller module, root respectively
The movement of first controller module is controlled according to the information of the analysis information feedback module feedback.
Further, the Detection of Stability module further includes first information logging modle, and the first information records mould
Block and the analysis information feedback module are electrically connected, when the analysis information feedback module feeds back previous moment and later moment in time
Sound pressure level when differing by more than setting value, when the time of the first information logging modle record operating condition operation and mutation
It carves, and the number that programming count mutates.
Further, the Detection of Stability module further includes the second information logging modle, when the analysis information is fed back
Module feedback previous moment is differed with the sound pressure level of later moment in time when being less than setting value, the second information logging modle record
Live signal.
Preferably, the test macro further includes the anechoic room of closing setting, the first wheat being placed in the anechoic room
Gram wind and second microphone, the first loudspeaker being arranged on the wall of the anechoic room and the second loudspeaker are arranged described
There is the seat of headrest, first loudspeaker issues noise signal as noise source, and second loudspeaker is used in anechoic room
In the active noise reduction system, de-noising signal is issued, first microphone is arranged at the ceiling position of the anechoic room, uses
In the active noise reduction system, the second microphone is separately positioned on the left and right sides of the headrest, is used for the stability
Detection system acquires the noise signal after noise reduction at the headrest positions.
Further, on the seat of the people in the anechoic room when sitting, in front of the face orientation of people, described first
Loudspeaker is arranged on the wall before the anechoic room and extend into the anechoic room, and second loudspeaker has two
It is a, on the wall for the left and right sides that two second loudspeakers are individually positioned in the anechoic room and it extend into the anechoic room
In.
Further, the anechoic room includes front, rear, left and right four sides wall and roof, the four sides wall and the room
The material on top is identical.
Due to the application of the above technical scheme, compared with the prior art, the invention has the following advantages: active of the invention
Whether noise reduction system stability test method can detect the active noise reduction system under various operating conditions stable, and according to the result of feedback
Judge that unstable operating condition occurs in the active noise reduction system, to improve the working range and work of the active noise reduction system
Reliability.
Specific embodiment
The technical solution of the present invention will be further described below with reference to the accompanying drawings.
As shown in Figure 1, active noise reduction system of the invention includes that noise information obtains modules A 01, control signal construction mould
Block A02, the first controller module A03 and loudspeaker module A04.Noise information obtains modules A 01 for obtaining under various operating conditions
Internal car noise signal;It controls signal constructing module A02 and noise information obtains modules A 01 and is electrically connected, be used for noise information
It obtains the noise signal that modules A 01 obtains to be integrated, obtains noise source;First controller module A03 and control signal construction
Modules A 02 is electrically connected, and exports de-noising signal according to the noise source after control signal constructing module A02 integration;Loudspeaker module
A04 and the first controller module A03 is electrically connected, and the first controller module A03 output signal obtains loudspeaker through power amplification
Pumping signal is exported by loudspeaker module A04.
First controller module A03 include noise reduction mode input module C01, the first controlled load case determining module C02 and
Control order module C03 is chosen, as shown in Figure 2.
Active noise reduction system system for testing stability of the invention includes Detection of Stability system, Detection of Stability system with
Active noise reduction system is electrically connected.As shown in figure 3, Detection of Stability system includes that obtain module K01, data real-time for noise data
Analysis module K02, analysis information feedback module K03 and second controller module K04, noise data obtain module K01 and are used for
Noise signal at collecting test position after active noise reduction system controls;Data real time analysis module K02 is obtained with noise data
Modulus block K01 is electrically connected, and the data for obtaining module K01 acquisition to noise data carry out processing analysis;It is anti-to analyze information
It presents module K03 and data real time analysis module K02 to be electrically connected, according to data real time analysis module K02 analysis treated number
It is judged that whether it is more than setting value that previous moment is differed with the sound pressure level of later moment in time;Second controller module K04 is analyzed respectively
Information feedback module K03 and the first controller module A03 is electrically connected, for what is issued according to information feedback module K03 feedback
Information output order gives the first controller module A03, controls the movement of the first controller module A03, when analysis information feeds back mould
When the sound pressure level of block K03 feedback previous moment and later moment in time differs by more than setting value, second controller module K04 sends instruction
To the first controller module A03, when analysis information feedback module K03 feedback previous moment differs not with the sound pressure level of later moment in time
When more than setting value, second controller module K04 does not send instructions to the first controller module A03.
Detection of Stability system further includes first information logging modle K05, first information logging modle K05 and analysis information
Feedback module K03 is electrically connected, when analysis information feedback module K03 feedback previous moment differs super with the sound pressure level of later moment in time
When crossing setting value, first information logging modle K05 records the time of operating condition operation and mutates the moment, and programming count is sent out
The number of raw mutation.
Detection of Stability system further includes the second information logging modle K06, the second information logging modle K06 and analysis information
Feedback module K03 is electrically connected, when analysis information feedback module K03 feedback previous moment differs not with the sound pressure level of later moment in time
When more than setting value, first information logging modle K06 records live signal.
The active noise reduction system system for testing stability further includes the experimental rig for carrying out Detection of Stability, such as Fig. 4 and Fig. 5
It is shown, experimental rig include closing setting anechoic room 1, the first microphone 2 for being placed in anechoic room 1 and second microphone 3,
The seat with headrest is arranged in anechoic room 1 in the first loudspeaker 4 and the second loudspeaker 5 that are arranged on the wall of anechoic room 1
6。
Anechoic room 1 includes front, rear, left and right four sides wall and roof, and four sides wall is identical with the material on roof.People is in place
On seat 6 in anechoic room 1 when sitting, in front of the face orientation of people, the left and right sides of the body of people is respectively anechoic room 1
Left and right wall.
First loudspeaker 4 is arranged on the wall before anechoic room 1, and extend into anechoic room 1 from the wall of front,
First loudspeaker 4 is used as noise source, issues noise signal.Second loudspeaker 5 is used for active noise reduction system, passes through the first controller
Modules A 03 controls sounding, which is used for noise reduction;There are two second loudspeakers 5, and two the second loudspeakers 5 are individually positioned in and disappear
On the wall of the left and right sides of sound chamber 1, and it is extend into anechoic room 1 from the wall of the left and right sides respectively.In the present embodiment, first
Loudspeaker 4 and the second loudspeaker 5 are all made of 5 cun of passive sound.
First microphone 2 is arranged at the ceiling position of anechoic room 1, is used for active noise reduction system.Second microphone 3 is distinguished
It is arranged in the left and right sides of the headrest of the seat 6 in anechoic room 1, Detection of Stability system is used for, to acquire noise reduction back
The noise signal at position is rested the head on, provides real-time noise information for Detection of Stability system.
Fig. 6 shows the flow diagram that active noise reduction system of the invention carries out stability test, mainly includes such as
Lower process step:
(1) modules A 01 is obtained by noise information and acquires the internal car noise signal under various operating conditions, dropped using this signal as active
The input noise signal for system of making an uproar.
Measurement condition includes the static state and dynamic operation condition after vehicle motor starting, and static operating condition includes at least IS Idle Switch
Air-conditioning, fixation, original place POT;Dynamic operation condition includes at least at the uniform velocity 40-100km/h, slow acceleration POT, anxious acceleration WOT, Tip in/
out.Each operating condition at least tests three groups of data, and every group is at least tested 10s, and ambient noise will be lower than institute's measurement condition when test
Noise at least 10dB(A).
When obtaining noise signal interior under each operating condition, measuring point is selected in the left and right sides of driver's headrest, by two
The noise signal of point position is compared, it is ensured that the accuracy and availability of test data.
(2) integration processing is carried out to step (1) test data obtained in control signal constructing module A02, obtained
The noise source of active noise reduction system.When test, which is output in anechoic room 1 by the first loudspeaker 4.
The signal after signal constructing module A02 is integrated will be controlled and obtain loudspeaker pumping signal after power amplification,
Using the loudspeaker signal as the noise source of active noise reduction system.
When signal will guarantee to switch between a upper operating condition and next operating condition in integrating treatment process, two kinds of sound letters
Number it is continuous.After pending data arranges, it is converted into the identifiable file format of active noise reduction system.
(3) first controller module A03 controlled according to noise source after export de-noising signal to loudspeaker module
A04。
Order control module C03 in first controller module A03 may be selected to reduce certain in 2 ranks, 4 ranks, 6 ranks of signal
One order noise or multiple order noises, posttectonic signal, which exports, gives loudspeaker module A04.
(4) output signal of step (3) obtains loudspeaker pumping signal after power amplification, controls loudspeaker module
A04 output signal noise reduction, de-noising signal herein pass through two the second loudspeakers 5 respectively and enter in anechoic room 1.
(5) module K01 is obtained by noise data to acquire in real time at left and right sides position of resting the head in anechoic room 1 after control
Noise signal, noise signal herein are obtained by two second microphones 3.
(6) noise signal obtained in data real time analysis module K02 to step (5) is analyzed and processed.
Real-time Fourier data transformation is carried out in data real time analysis module K02, to real-time Fourier transformation point
Analysis data are analyzed.
(7) judge in analysis information feedback module K03 previous moment differ with the sound pressure level of later moment in time whether be more than
Setting value.
Real-time difference when peak-peak noise reduction within 20-500Hz is detected, calculation formula is as shown in following formula 1;
Fa=Ft2- Ft1 (1)
In formula: Fa indicates the real-time difference of noise reduction effect, the noise after Ft1 expression previous moment Fourier transformation at peak-peak
It is worth, the noise figure after later moment in time Fourier transformation of the Ft2 expression after Ft1 at peak-peak.In the present embodiment, previous moment
For preceding 0.05s, later moment in time is rear 0.05s.
If the difference at this is greater than the set value, in the present embodiment, setting value is 2dB (A), analyzes information feedback module
K03 exports feedback information and gives second controller module K04, while the time of first information logging modle K05 record operating condition operation
And it mutates the moment, and the number that programming count mutates.
If the difference at this is not more than setting value, illustrate that active noise reduction system plays Noise Reduction, analysis information feedback
Feedback signal, the second information logging modle K06 do not record real time information to module K03, and the first controller module A03, which is continued to output, to be worked as
Preceding moment noise signal carries out noise reduction process.
(8) information that second controller module K04 is fed back according to information feedback module K03, output relevant control actively drop
The instruction for system of making an uproar, the instruction are directly inputted in the first controller module A03, when making current in the first controller module A03
The control parameter at quarter is reset, the first controller module even if active noise reduction system restarts work, in active noise reduction system
A03 exports de-noising signal according to the noise signal of subsequent time, repeats step (4) ~ (8).
So circulation carries out repeatedly, and circulation all includes all operating conditions every time, after circulation terminates, automatically begins to every time next
Circulation, exports examining report after circulation terminates to all automatically, more to going wrong to analyze the stability of the system
Operating condition carry out careful analysis, while for active noise reduction algorithm engineer provide relevant optimization direction and optimize operating condition.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar can understand the contents of the present invention and be implemented, and it is not intended to limit the scope of the present invention, it is all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the scope of protection of the present invention.