CN108644965A - A kind of air-conditioning and the distributed active denoising method of central air-conditioning - Google Patents
A kind of air-conditioning and the distributed active denoising method of central air-conditioning Download PDFInfo
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- CN108644965A CN108644965A CN201810451450.0A CN201810451450A CN108644965A CN 108644965 A CN108644965 A CN 108644965A CN 201810451450 A CN201810451450 A CN 201810451450A CN 108644965 A CN108644965 A CN 108644965A
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
- F24F2013/247—Active noise-suppression
Abstract
A kind of air-conditioning and the distributed active denoising method of central air-conditioning,By integrating input module,Output module and central processing unit,Small-scale noise reduction region is formed around output module,And ensure not increase influence of noise to the range outside noise reduction region,So need not be adapted to for air-conditioning model,Any position at air port is can select to install,This noise-reduction method in the space of noise reduction target area to passing through Mike's acquisition noise,Calculate noise region sound field in real time,Driving output module sends out the reverse phase noise reduction sound field of zonule while not increasing noise reduction target area with the acoustic energy of the external space,Since the noise reduction regional extent that need to be controlled is small,Efficiency of algorithm and noise reduction can be improved,Different air-conditionings need not be directed to and the model of central air-conditioning is adapted to,Input module and loudspeaker can concentrate in the same equipment,Input module need not be arranged separately in the surrounding in room,User can be supported to install additional.
Description
Technical field
The present invention relates to air-conditioning and field of central air-conditioning more particularly to a kind of air-conditioning and central air-conditioning actively to be dropped with distributed
Method for de-noising.
Background technology
What current air-conditioning and technical field of central air used is mostly passive noise reduction mode, and the quilt of air-conditioning and central air-conditioning
Dynamic noise reduction mode can no longer meet the noise reduction requirement to indoor unit now, and active noise reduction techniques are then gradually introducing household electrical appliances neck
Domain, although many for the active denoising method for reducing indoor air port, focus is only that how to reduce an air port noise asks
Topic does not consider on being influenced caused by indoor air inlet close to each other or air outlet, such as the air inlet of central air-conditioning air pipe machine
The problem of being interfered with each other with the sound wave of air outlet, existing distribution active noise reduction also only consideration noise reduction region noise reduction itself
Effect, or the problem of do not intervene other noise reduction regions, does not consider the space other than each noise reduction region, therefore outer space environment
There is increased possibility in noise pole.
Invention content
The present invention is intended to provide a kind of air-conditioning and the distributed active denoising method of central air-conditioning.
To realize the above-mentioned technical purpose, the present invention uses following technical scheme, a kind of air-conditioning and central air-conditioning distribution
Active denoising method, this method comprises the following steps：
S1, System self-test, what the System self-test module of noise reduction system received and processed the report of each of which subsystem itself is
System information determines whether to have subsystem increase and decrease, and timing system detection module is equipped in simultaneity factor selftest module, is detected
Subsystem information can carry out system correction after changing, and re-start self-test, if there is the subsystem of newly-increased or new reduction, always
System can restart whole calculating process using new subsystem quantity as standard, update whole total system and each subsystem
It unites new evaluation condition and equation, subsequent System self-test module can calculate noise reduction control errors function and be published to each subsystem
In；
S2, target sub system input module acquisition noise information, input module is by collected ambient noise information through defeated
Enter module and converts analog signals into digital signal；
S3, target sub system multi-channel noise information pre-processing, the noise information that step S2 is obtained are delivered to input module
The corresponding signal all the way in each input module monitoring point is carried out pre-processing after being converted to digital signal, by digital-to-analogue
Advanced row data slicer after conversion, i.e., temporally uniform cutting acquires signal, and ensures that every section of timeslice has overlapping portion, then
FFT Fourier transforms are carried out to the data of each timeslice, each timeslice is made to obtain the frequency domain function of a set of frequencies distribution,
Mean value computation is done to the frequency domain function of all timeslices again and obtains the statistics acoustic pressure data array that input module corresponds to monitoring point,
The sound pressure signal frequency domain data array of monitoring point is finally delivered to central processing unit；
S4, operation noise reduction algorithm calculate in real time drives input vector suitable for the electric signal of output module, specifically will
Whole system is divided according to subsystem, and each subsystem corresponds to a noise reduction target area, then each subsystem is corresponding
The sound field in noise reduction region, it should for the sound field that all output modules in oneself region generate, be superimposed with other each subsystems
The combination of each output module sound field in region, the purpose of algorithm are to ensure that the noise reduction target area noise reduction of oneself is best
While ensure to influence the sound field in the subsystem region of other work it is sufficiently small, while to the outside other than noise reduction target area
The influence in space is minimum, is exactly the sound of the electric signal input driving and transmission function structure output module in conjunction with output module first
Sound influences expression formula, and since what is built in subsystem is output module, the driving of electric signal input herein is an electric signal vector,
The mapping function of mapping function when transmission function inherently output module dispatches from the factory, the electric signal driving sound field of output module exists
Just it has been determined that can be obtained by measuring when the hardware of the output module makes manufacture, the sound of target sub system is built at this time
Formula is influenced, i.e. the output module of the collected noise sound field superposition target sub system of input module of target sub system is to target
The acoustic impacts expression formula of subsystem itself, while also to build target sub system output module sounding and influence its sub-systems
Acoustic impacts formula and target sub system sounding influence the acoustic impacts formula of the exterior space except noise reduction target area, tool
Body be first pass through combining target subsystem output module transmission function and input electrical signal vector to remaining some subsystem
The superpositions of input module acoustic impacts obtain the acoustic impacts to some its sub-systems, then it is target sub system is complete to remaining
The acoustic impacts that portion's subsystem obtains respectively are overlapped to obtain acoustic impacts formula, in addition, target sub system is to noise reduction target
The acoustic impacts of exterior space other than region combine the transmission function of exterior space by the output module of target sub system
Input electrical signal vector obtains the acoustic impacts to exterior space to the superposition that external spatial sound influences, and exterior space, which is in, is
The transmission function that a sensor is used for measuring target sub system to exterior space can be arranged in system before starting, it is right to pass through in transmission function
In the case that output module test can measure, minimal solution is asked to the acoustic impacts formula of target sub system itself and keeps target sub
System is both less than one to the acoustic impacts formula and target sub system of its sub-systems to the acoustic impacts formula of exterior space
The numerical value of a threshold value, the threshold value is also small as possible, and can be obtained most suitable electric signal to above three equations in this way inputs
Driving vector, each subsystem complete independently above step solve the electric signal input driving vector of each subsystem, complete
Total system calculates；
S5, subsystem driving output module send out reverse phase noise reduction sound wave, and the central processing unit of each subsystem will be described
Each output module electric signal driving vector be sent to respective output module, after output module is converted to analog signal again
It is delivered to output module after amplification module amplifies and sends out reverse phase noise reduction acoustic wave form into noise abatement sound field completion noise reduction；
S6, error feedback, noise information input module can measure the result of noise reduction and judge whether noise reduction is up to standard, into
Row error is fed back, the noise reduction process new noise sound field is calculated if not up to standard and repeats the above-mentioned S4 since step；
If the error feedback result of S7, step S6 are up to standard, terminate flow.
Further, the statistics acoustic pressure data array of the correspondence monitoring point for the target sub system input module that step S2 is obtained
For P (X(i) j, f), j：1,2,3 ... m；X(i) jIt is the position coordinates of j-th of input module monitoring point in the areas i, m is of monitoring point
Number, f are the frequency domain statistics sound pressure levels that monitoring point collects signal.
Further, system is made of R subsystem in step S4, then is corresponding with R target noise reduction region, per height
The input module and output module number of system indicate as follows：
The noise data that input module measures, whole system indicate as follows：
Wherein each subsystem difference：
Wherein X(i) jIndicate that j-th of input module in the regions i, subscript indicate that region, subscript indicate input module number,
Whole system is divided according to subsystem, and each subsystem corresponds to a noise reduction target area, determine one group of base for describe make an uproar
Sound, base are equivalent to reference axis, and entire space is described with the form of different reference axis, can be chosen according to application scenarios difference
A variety of different bases such as acoustic radiating mode, cavity mode, multistage son describe entire sound field, then each subsystem is corresponding
The sound field in noise reduction region, it should for the sound field that all output modules in oneself region generate, be superimposed with other each subsystems
The combination of each output module sound field in region, then we i-th of subsystem is described, to the sound shadow of j-th of subsystem
It rings, uses following formula：
Acoustic impacts following formula of i-th of subsystem to external space S is described：
WhereinFor the output module in i-th of subsystem electric signal drive input, due to i-th of subsystem have it is multiple
The array of output module composition, soFor a vector, each vectorial element represents one of output module electricity
Signal drives：
An output module can be acoustically described with transmission function to be influenced to the acoustic field of an input module, or more
T in formula(i,j)With TS (i, S) and it is a transfer function matrix：
T(i,j)One formula indicates each output module in i-th of subsystem, respectively to each input mould of j-th subsystem
The transmission function of block, since i-th of subsystem corresponds to No. i-th target area, including Mi input module and Ni output module,
And since j-th of subsystem corresponds to jth target area, including Mj input module and Nj output module, so T(i,j)It is
The matrix of one Mj rows Ni row, H therein is transmission function of the corresponding output module to input module, is obtained by survey calculation
, i.e. H(i,j) Mj,NiThe Ni output modules in i-th of subsystem are indicated, to Mj input modules in j-th of subsystem
Transmission function, TS(i, S)(f) formula indicates each output module in i-th of subsystem, respectively to the S perimeter
The transmission function of each input module, output module correspond to area of space input module, and i-th of subsystem corresponds to No. i-th
Target area, including Ni output module, the S perimeter includes MS input module, HS(i,S) MS, NiIndicate i-th of son
Ni output modules in system, to the transmission function of MS input modules in the S region；So the target of system
One group of vector exactly is found out to the i-th work song systemSo that the superposition sound field value of target area i is minimum and to other every height
The target area sound field of system influences to influence to be less than a threshold value beta, the threshold less than a threshold alpha and on exterior space on sound field
Value α is interactional threshold value between an expression subsystem, be the relationship between the energy value of sound and decibel is (log
α)/10=N decibels, the choosing method of the threshold value is：A collection of user is chosen to carry out hearing test, determine user can receive how much
Decibel volume below without feeling irritated, according to target user's sample of target scene experience statistics obtain one it is determining
Decibel value, that is, N decibels, α energy values are then converted into, the selection of threshold value beta is corresponding at expression formula similarly in threshold alpha：
Then aims of systems is changed into the mathematical problem for solving an optimum solution under Prescribed Properties：With mathematics public affairs
Formula expression seeks a solution vectorMeet following mathematic(al) representation： Findbysolving a constrained
optimization problem：
Here the optimum solution mathematical problem being transformed under the constraints of a standard, using Karush-Kuhn-
Tucker mathematical theories models solves, and abbreviation K-K-T is theoretical：
Three equations are exactly the canonical form of k-k-T above, whereinWithInTo ask
The mathematic sign led,WithIt is the variable that K-K-T model solutions introduce in the process,Refer specifically to k-th of subsystem
The input module quantity of system, mk are the input module label of kth work song system,Corresponding to subsystems exterior space
Exterior space contained by input module quantity, the input module quantity of z-th of subsystem, mz is the defeated of z-th area of space
Enter number of modules, optimal solution is obtained by the above-mentioned equation of K-K-T theoretical algorithm solutionsVector：
Each subsystem complete independently above step solves the driving electric signal vector of each subsystem, completes whole
System-computed.
Further, it should ensure that every section of timeslice has 50% overlapping portion in step S2.
Further, it obtains influencing threshold alpha and β in addition to being based on statistic law, is also based on psychologic acoustics index, industrial index
Refer to calibration method with voice interference degree to determine α, β threshold value.
Further, input module and output module are microphone and loud speaker.
Further, which can be used for the active noise reduction of central air-conditioning air pipe machine.
The present invention forms small model by integrated input module, output module and central processing unit around output module
The noise reduction region enclosed, and ensure not increase influence of noise to the range outside noise reduction region, so air-conditioning and center need not be directed to
Air-conditioning model is adapted to, can user select at air port any position and install, this noise-reduction method is to noise reduction target area space
Interior to calculate noise region sound field in real time by Mike's acquisition noise, driving output module sends out the reverse phase noise reducing of zonule
Calculation can be improved with the acoustic energy of the external space since the noise reduction regional extent that need to be controlled is small by not increasing noise reduction target area simultaneously for field
Method efficiency and noise reduction, independent equipment equip the dedicated loudspeaker of noise reduction, need not be directed to different air-conditionings and central air-conditioning
Model is adapted to, plug and play, and input module and loudspeaker can concentrate in the same equipment, need not be by input module list
Solely be mounted on the surrounding in room, user can be supported to install additional, do not need air-conditioning and central air-conditioning manufacturer it is integrated in advance, it can be achieved that
Targetedly active noise reduction, and, effect relatively small because of the noise reduction target area of each equipment in device target region
Can be more obvious, and the requirement meeting relative reduction for chip, cost will also reduce, equipment has reason activity, can be according to a
The difference of human needs selects the quantity of equipment and the position of installation, easy to operate, easy for assemble or unload, in addition, current master
Dynamic noise-reduction method generally all considers that the noise reduction region near air port near zone noise reduction problem or multiple air ports interfered with each other asks
Topic, noise-reduction method of the invention increases exterior space and considers dimension, in addition to by the influence of noise reduction subsystem itself and subsystem
Mutual influence is preferably minimized outer, and the present invention has also taken into account the noise problem of exterior space, because people in the room it is usual not
It can be fixed on that certain is motionless, only consider that the noise problem near air port is inadequate, the outside other than noise reduction target area
Space equally has personnel activity, and the present invention is by the threshold value of one exterior space of setting, the influence by noise to exterior space
It is near minimum, it can ensure that, in the air-conditioning and central air-conditioning using active noise reducing device, any one region in the room is empty
Between ambient noise will not increase or even smaller.
Description of the drawings
Fig. 1 is the flow chart of distributed active denoising method of the invention.
Specific implementation mode
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the present invention, unless otherwise specified and limited, it should be noted that term " installation ", " connected ",
" connection " shall be understood in a broad sense, for example, it may be mechanical connection or electrical connection, can also be the connection inside two elements, it can
It, can also be indirectly connected through an intermediary to be to be connected directly.It for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term.
The distributed active noise reduction side of a kind of air-conditioning and central air-conditioning according to the ... of the embodiment of the present invention is described referring to Fig. 1
Method, this method comprises the following steps：
S1, System self-test, what the System self-test module of noise reduction system received and processed the report of each of which subsystem itself is
System information determines whether to have subsystem increase and decrease, and timing system detection module is equipped in simultaneity factor selftest module, is detected
Subsystem information can carry out system correction after changing, and re-start self-test, if there is the subsystem of newly-increased or new reduction, always
System can restart whole calculating process using new subsystem quantity as standard, update whole total system and each subsystem
It unites new evaluation condition and equation, subsequent System self-test module can calculate noise reduction control errors function and be published to each subsystem
In；
S2, target sub system input module acquisition noise information, input module is by collected ambient noise information through defeated
Enter module and converts analog signals into digital signal；
S3, target sub system multi-channel noise information pre-processing, the noise information that step S2 is obtained are delivered to input module
The corresponding signal all the way in each input module monitoring point is carried out pre-processing after being converted to digital signal, by digital-to-analogue
Advanced row data slicer after conversion, i.e., temporally uniform cutting acquires signal, and ensures that every section of timeslice has overlapping portion, then
FFT Fourier transforms are carried out to the data of each timeslice, each timeslice is made to obtain the frequency domain function of a set of frequencies distribution,
Mean value computation is done to the frequency domain function of all timeslices again and obtains the statistics acoustic pressure data array that input module corresponds to monitoring point,
The sound pressure signal frequency domain data array of monitoring point is finally delivered to central processing unit；
S4, operation noise reduction algorithm calculate in real time drives input vector suitable for the electric signal of output module, specifically will
Whole system is divided according to subsystem, and each subsystem corresponds to a noise reduction target area, then each subsystem is corresponding
The sound field in noise reduction region, it should for the sound field that all output modules in oneself region generate, be superimposed with other each subsystems
The combination of each output module sound field in region, the purpose of algorithm are to ensure that the noise reduction target area noise reduction of oneself is best
While ensure to influence the sound field in the subsystem region of other work it is sufficiently small, while to the outside other than noise reduction target area
The influence in space is minimum, is exactly the sound of the electric signal input driving and transmission function structure output module in conjunction with output module first
Sound influences expression formula, and since what is built in subsystem is output module, the driving of electric signal input herein is an electric signal vector,
The mapping function of mapping function when transmission function inherently output module dispatches from the factory, the electric signal driving sound field of output module exists
Just it has been determined that can be obtained by measuring when the hardware of the output module makes manufacture, the sound of target sub system is built at this time
Formula is influenced, i.e. the output module of the collected noise sound field superposition target sub system of input module of target sub system is to target
The acoustic impacts expression formula of subsystem itself, while also to build target sub system output module sounding and influence its sub-systems
Acoustic impacts formula and target sub system sounding influence the acoustic impacts formula of the exterior space except noise reduction target area, tool
Body be first pass through combining target subsystem output module transmission function and input electrical signal vector to remaining some subsystem
The superpositions of input module acoustic impacts obtain the acoustic impacts to some its sub-systems, then it is target sub system is complete to remaining
The acoustic impacts that portion's subsystem obtains respectively are overlapped to obtain acoustic impacts formula, in addition, target sub system is to noise reduction target
The acoustic impacts of exterior space other than region combine the transmission function of exterior space by the output module of target sub system
Input electrical signal vector obtains the acoustic impacts to exterior space to the superposition that external spatial sound influences, and exterior space, which is in, is
The transmission function that a sensor is used for measuring target sub system to exterior space can be arranged in system before starting, it is right to pass through in transmission function
In the case that output module test can measure, minimal solution is asked to the acoustic impacts formula of target sub system itself and keeps target sub
System is both less than one to the acoustic impacts formula and target sub system of its sub-systems to the acoustic impacts formula of exterior space
The numerical value of a threshold value, the threshold value is also small as possible, and can be obtained most suitable electric signal to above three equations in this way inputs
Driving vector, each subsystem complete independently above step solve the electric signal input driving vector of each subsystem, complete
Total system calculates；
S5, subsystem driving output module send out reverse phase noise reduction sound wave, and the central processing unit of each subsystem will be described
Each output module electric signal driving vector be sent to respective output module, after output module is converted to analog signal again
It is delivered to output module after amplification module amplifies and sends out reverse phase noise reduction acoustic wave form into noise abatement sound field completion noise reduction；
S6, error feedback, noise information input module can measure the result of noise reduction and judge whether noise reduction is up to standard, into
Row error is fed back, the noise reduction process new noise sound field is calculated if not up to standard and repeats the above-mentioned S4 since step；
If the error feedback result of S7, step S6 are up to standard, terminate flow.
Further, the statistics acoustic pressure data array of the correspondence monitoring point for the target sub system input module that step S2 is obtained
For P (X(i) j, f), j：1,2,3 ... m；X(i) jIt is the position coordinates of j-th of input module monitoring point in the areas i, m is of monitoring point
Number, f are the frequency domain statistics sound pressure levels that monitoring point collects signal.
Further, system is made of R subsystem in step S4, then is corresponding with R target noise reduction region, per height
The input module and output module number of system indicate as follows：
The noise data that input module measures, whole system indicate as follows：
Wherein each subsystem difference：
Wherein X(i) jIndicate that j-th of input module in the regions i, subscript indicate that region, subscript indicate input module number,
Whole system is divided according to subsystem, and each subsystem corresponds to a noise reduction target area, determine one group of base for describe make an uproar
Sound, base are equivalent to reference axis, and entire space is described with the form of different reference axis, can be chosen according to application scenarios difference
A variety of different bases such as acoustic radiating mode, cavity mode, multistage son describe entire sound field, then each subsystem is corresponding
The sound field in noise reduction region, it should for the sound field that all output modules in oneself region generate, be superimposed with other each subsystems
The combination of each output module sound field in region, then we i-th of subsystem is described, to the sound shadow of j-th of subsystem
It rings, uses following formula：
Acoustic impacts following formula of i-th of subsystem to external space S is described：
WhereinFor the output module in i-th of subsystem electric signal drive input, due to i-th of subsystem have it is multiple
The array of output module composition, soFor a vector, each vectorial element represents one of output module electricity
Signal drives：
An output module can be acoustically described with transmission function to be influenced to the acoustic field of an input module, or more
T in formula(i,j)And TS(i, S)It is a transfer function matrix：
T(i,j)One formula indicates each output module in i-th of subsystem, respectively to each input mould of j-th subsystem
The transmission function of block, since i-th of subsystem corresponds to No. i-th target area, including Mi input module and Ni output module,
And since j-th of subsystem corresponds to jth target area, including Mj input module and Nj output module, so T(i,j)It is
The matrix of one Mj rows Ni row, H therein is transmission function of the corresponding output module to input module, is obtained by survey calculation
, i.e. H(i,j) Mj,NiThe Ni output modules in i-th of subsystem are indicated, to Mj input modules in j-th of subsystem
Transmission function, TS(i, S)(f) formula indicates each output module in i-th of subsystem, respectively to the S perimeter
The transmission function of each input module, output module correspond to area of space input module, and i-th of subsystem corresponds to No. i-th
Target area, including Ni output module, the S perimeter includes MS input module, HS(i,S) MS, NiIndicate i-th of son
Ni output modules in system, to the transmission function of MS input modules in the S region；So the target of system
One group of vector exactly is found out to the i-th work song systemSo that the superposition sound field value of target area i is minimum and to other every height
The target area sound field of system influences to influence to be less than a threshold value beta, the threshold less than a threshold alpha and on exterior space on sound field
Value α is interactional threshold value between an expression subsystem, be the relationship between the energy value of sound and decibel is (log
α)/10=N decibels, the choosing method of the threshold value is：A collection of user is chosen to carry out hearing test, determine user can receive how much
Decibel volume below without feeling irritated, according to target user's sample of target scene experience statistics obtain one it is determining
Decibel value, that is, N decibels, α energy values are then converted into, the selection of threshold value beta is corresponding at expression formula similarly in threshold alpha：
Then aims of systems is changed into the mathematical problem for solving an optimum solution under Prescribed Properties：With mathematics public affairs
Formula expression seeks a solution vectorMeet following mathematic(al) representation： Findbysolving a constrained
optimization problem：
Here the optimum solution mathematical problem being transformed under the constraints of a standard, using Karush-Kuhn-
Tucker mathematical theories models solves, and abbreviation K-K-T is theoretical：
Three equations are exactly the canonical form of k-k-T above, whereinWithInTo ask
The mathematic sign led,WithIt is the variable that K-K-T model solutions introduce in the process,Refer specifically to k-th of subsystem
The input module quantity of system, mk are the input module label of kth work song system,Corresponding to subsystems exterior space
Exterior space contained by input module quantity, the input module quantity of z-th of subsystem, mz is the defeated of z-th area of space
Enter number of modules, optimal solution is obtained by the above-mentioned equation of K-K-T theoretical algorithm solutionsVector：
Each subsystem complete independently above step solves the driving electric signal vector of each subsystem, completes whole
System-computed.
Further, it should ensure that every section of timeslice has 50% overlapping portion in step S2.
Further, it obtains influencing threshold alpha and β in addition to being based on statistic law, is also based on psychologic acoustics index, industrial index
Refer to calibration method with voice interference degree to determine α, β threshold value.
Further, input module and output module are microphone and loud speaker.
Further, which can be used for the active noise reduction of central air-conditioning air pipe machine.
The present invention forms small model by integrated input module, output module and central processing unit around output module
The noise reduction region enclosed, and ensure not increase influence of noise to the range outside noise reduction region, so air-conditioning and center need not be directed to
Air-conditioning model is adapted to, can user select at air port any position and install, this noise-reduction method is to noise reduction target area space
Interior to calculate noise region sound field in real time by Mike's acquisition noise, driving output module sends out the reverse phase noise reducing of zonule
Calculation can be improved with the acoustic energy of the external space since the noise reduction regional extent that need to be controlled is small by not increasing noise reduction target area simultaneously for field
Method efficiency and noise reduction, independent equipment equip the dedicated loudspeaker of noise reduction, and the model that need not be directed to different air-conditionings is fitted
Match, plug and play, input module and loudspeaker can concentrate in the same equipment, need not input module be arranged separately in room
Between surrounding, user can be supported to install additional, it is integrated, it can be achieved that in device target area in advance not need air-conditioning and central air-conditioning manufacturer
Targetedly active noise reduction in domain, but because the noise reduction target area of each equipment is relatively small, effect can be more obvious,
And the requirement meeting relative reduction for chip, cost will also reduce, equipment has reason activity, can be according to a human needs not
Together, the quantity of equipment and the position of installation are selected, it is easy to operate, it is easy for assemble or unload, in addition, current active denoising method one
As all consider the problems of that the noise reduction region near air port near zone noise reduction problem or multiple air ports interferes with each other, drop of the invention
Method for de-noising increases exterior space and considers dimension, in addition to dropping the mutual influence of the influence of noise reduction subsystem itself and subsystem
To outside minimum, the present invention has also taken into account the noise problem of exterior space, because people will not usually be fixed on certain in the room
It is motionless, only consider the noise problem near air port be it is inadequate, exterior space other than noise reduction target area equally someone will
Member's activity, the present invention is by the threshold value of one exterior space of setting, and the influence by noise to exterior space is near minimum, Neng Goubao
It demonstrate,proves in the air-conditioning and central air-conditioning using active noise reducing device, any one regional space ambient noise in the room will not increase
Add or even smaller.
In the description of this specification, the description meaning of reference term " one embodiment ", " example " or " some examples " etc.
Refer at least one reality that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained in the present invention
It applies in example or example.In the present specification, schematic expression of the above terms are not necessarily referring to identical embodiment or show
Example.Moreover, particular features, structures, materials, or characteristics described can be in any one or more of the embodiments or examples
It can be combined in any suitable manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
In the case of being detached from the principle of the present invention and objective a variety of change, modification, replacement and modification can be carried out to these embodiments, this
The range of invention is limited by claim and its equivalent.
Claims (7)
1. a kind of air-conditioning and the distributed active denoising method of central air-conditioning, which is characterized in that this method comprises the following steps：
The System self-test module of S1, System self-test, noise reduction system receives and processes the own system letter of each of which subsystem report
It ceases to determine whether have subsystem increase and decrease, timing system detection module is equipped in simultaneity factor selftest module, detects subsystem
System information can carry out system correction after changing, and re-start self-test, if there is the subsystem of newly-increased or new reduction, total system
Whole calculating process can be restarted using new subsystem quantity as standard, update whole total system and subsystems are new
Evaluation condition and equation, subsequent System self-test module can calculate noise reduction control errors function and be published in each subsystem；
S2, target sub system input module acquisition noise information, input module is by collected ambient noise information through inputting mould
Block converts analog signals into digital signal；
S3, target sub system multi-channel noise information pre-processing, the noise information that step S2 is obtained are delivered to input module conversion
To carry out pre-processing to the corresponding signal all the way in each input module monitoring point after digital signal, by digital-to-analogue conversion
Advanced row data slicer afterwards, i.e., temporally uniform cutting acquires signal, and ensures that every section of timeslice has overlapping portion, then to every
The data of a timeslice carry out FFT Fourier transforms, so that each timeslice is obtained the frequency domain function of a set of frequencies distribution, then right
The frequency domain function of all timeslices does mean value computation and obtains the statistics acoustic pressure data array that input module corresponds to monitoring point, finally
The sound pressure signal frequency domain data array of monitoring point is delivered to central processing unit；
S4, operation noise reduction algorithm calculate in real time drives input vector suitable for the electric signal of output module, specifically will be entire
System is divided according to subsystem, and each subsystem corresponds to a noise reduction target area, then the corresponding noise reduction of each subsystem
The sound field in region, it should for the sound field that all output modules in oneself region generate, be superimposed with other each subsystem regions
Each output module sound field combination, the purpose of algorithm is to ensure best same of noise reduction target area noise reduction of oneself
When ensure to influence the sound field in the subsystem region of other work it is sufficiently small, while to the exterior space other than noise reduction target area
Influence it is minimum, be exactly the sound shadow that output module is built with transmission function in conjunction with the electric signal input driving of output module first
Expression formula is rung, since what is built in subsystem is output module, the driving of electric signal input herein is an electric signal vector, is transmitted
The mapping function of mapping function when function inherently output module dispatches from the factory, the electric signal driving sound field of output module is defeated at this
Go out module hardware make manufacture when just it has been determined that by measure can obtain, at this time build target sub system acoustic impacts
Formula, i.e. the output module of the collected noise sound field superposition target sub system of input module of target sub system is to target subsystem
It unites the acoustic impacts expression formula of itself, while also to build target sub system output module sounding to influence the sound of its sub-systems
Influencing formula and target sub system sounding influences the acoustic impacts formula of the exterior space except noise reduction target area, specifically
First pass through combining target subsystem output module transmission function and input electrical signal vector to the defeated of remaining some subsystem
The superposition for entering analog sound influence obtains the acoustic impacts to some its sub-systems, then target sub system is all sub to remaining
The acoustic impacts that system obtains respectively are overlapped to obtain acoustic impacts formula, in addition, target sub system is to noise reduction target area
The acoustic impacts of exterior space in addition combine input by the output module of target sub system to the transmission function of exterior space
Electric signal vector obtains the acoustic impacts to exterior space to the superposition that external spatial sound influences, and exterior space is in system and opens
The transmission function that one sensor is used for measuring target sub system to exterior space can be set before dynamic, passed through to output in transmission function
In the case that module testing can be measured, minimal solution is asked to the acoustic impacts formula of target sub system itself and makes target sub system
Acoustic impacts formula and target sub system to its sub-systems are both less than a threshold to the acoustic impacts formula of exterior space
Value, the numerical value of the threshold value is also small as possible, can be obtained most suitable electric signal input driving to above three equations in this way
Vector, each subsystem complete independently above step solve the electric signal input driving vector of each subsystem, complete whole
System-computed；
S5, subsystem driving output module send out reverse phase noise reduction sound wave, and the central processing unit of each subsystem will be described every
A output module electric signal driving vector is sent to respective output module, after output module is converted to analog signal using
It is delivered to output module after amplification module amplification and sends out reverse phase noise reduction acoustic wave form into noise abatement sound field completion noise reduction；
S6, error feedback, noise information input module can measure the result of noise reduction and judge whether noise reduction is up to standard, is missed
Difference feedback, the noise reduction process new noise sound field is calculated if not up to standard and repeats the above-mentioned S4 since step；
If the error feedback result of S7, step S6 are up to standard, terminate flow.
2. distribution active denoising method as described in claim 1, which is characterized in that the target sub system that step S2 is obtained is defeated
The statistics acoustic pressure data array for entering the correspondence monitoring point of module is P (X(i) j, f), j：1,2,3 ... m；X(i) jBe in the areas i j-th it is defeated
Enter the position coordinates of module monitors point, m is the number of monitoring point, and f is the frequency domain statistics sound pressure level that monitoring point collects signal.
3. distribution active denoising method as claimed in claim 2, which is characterized in that system is by R subsystem in step S4
System composition, then be corresponding with R target noise reduction region, the input module and output module number of each subsystem indicate as follows：
The noise data that input module measures, whole system indicate as follows：
Wherein each subsystem difference：
Wherein X(i) jIndicate that j-th of input module in the regions i, subscript indicate that region, subscript indicate input module number, entirely
System is divided according to subsystem, and each subsystem corresponds to a noise reduction target area, determines one group of base for describing noise, base
It is equivalent to reference axis, entire space is described with the form of different reference axis, sound can be chosen according to application scenarios difference
A variety of different bases such as radiation mode, cavity mode, multistage son describe entire sound field, then the corresponding noise reduction of each subsystem
The sound field in region, it should for the sound field that all output modules in oneself region generate, be superimposed with other each subsystem regions
Each output module sound field combination, then we i-th of subsystem is described, to the acoustic impacts of j-th of subsystem, use
Following formula：
Acoustic impacts following formula of i-th of subsystem to external space S is described：
WhereinInput is driven for the electric signal of the output module in i-th of subsystem, since i-th of subsystem there are multiple outputs
The array of module composition, soFor a vector, each vectorial element represents one of output module electric signal
Driving：
An output module can be acoustically described with transmission function to be influenced to the acoustic field of an input module, in institute's above formula
T(i,j)And TS(i, S)It is a transfer function matrix：
T(i,j)One formula indicates each output module in i-th of subsystem, respectively to j-th subsystem each input module
Transmission function, since i-th of subsystem corresponds to No. i-th target area, including Mi input module and Ni output module, and by
Jth target area is corresponded in j-th of subsystem, including Mj input module and Nj output module, so T(i,j)It is one
The matrix of Mj rows Ni row, H therein is transmission function of the corresponding output module to input module, is obtained by survey calculation,
That is H(i,j) Mj, NiThe Ni output modules in i-th of subsystem are indicated, to the biography of Mj input modules in j-th of subsystem
Delivery function, TS(i, S)(f) formula indicates each output module in i-th of subsystem, respectively to each of the S perimeter
The transmission function of a input module, output module correspond to area of space input module, and i-th of subsystem corresponds to No. i-th target
Region, including Ni output module, the S perimeter includes MS input module, HS(i,S) MS, NiIndicate i-th of subsystem
In Ni output modules, to the transmission function of MS input modules in the S region；So the target of system is exactly pair
I-th work song system finds out one group of vectorSo that the superposition sound field value of target area i is minimum and to other each subsystems
Target area sound field influences to influence to be less than a threshold value beta less than a threshold alpha and on exterior space on sound field, which is
It is (log α)/10=that interactional threshold value between one expression subsystem, which is the relationship between the energy value of sound and decibel,
N decibels, the choosing method of the threshold value is：A collection of user is chosen to carry out hearing test, determine user can receive how many decibel with
Under volume without feeling irritated, a determining decibel value is obtained according to target user's sample of target scene experience statistics
That is N decibels, α energy values are then converted into, the selection of threshold value beta is corresponding at expression formula similarly in threshold alpha：
Then aims of systems is changed into the mathematical problem for solving an optimum solution under Prescribed Properties：
Seek a solution vector with mathematical formulae expressionMeet following mathematic(al) representation：
Here the optimum solution mathematical problem being transformed under the constraints of a standard, using Karush-Kuhn-Tucker numbers
Theory model solves, and abbreviation K-K-T is theoretical：
Three equations are exactly the canonical form of k-k-T above, whereinWithInFor derivation
Mathematic sign,WithIt is the variable that K-K-T model solutions introduce in the process,Refer specifically to k-th subsystem
Input module quantity, mk are the input module label of kth work song system,It is outer corresponding to subsystems exterior space
Input module quantity contained by portion space, the input module quantity of z-th of subsystem, mz are the input mould of z-th of area of space
Block number obtains optimal solution by the above-mentioned equation of K-K-T theoretical algorithm solutionsVector：
Each subsystem complete independently above step solves the driving electric signal vector of each subsystem, completes total system
It calculates.
4. distribution active denoising method as described in claim 1, which is characterized in that should ensure that every section of timeslice in step S2
There is 50% overlapping portion.
5. distribution active denoising method as claimed in claim 3, which is characterized in that obtain influencing threshold in addition to being based on statistic law
Value α and β also refer to calibration method to determine α, β threshold value based on psychologic acoustics index, industrial index and voice interference degree.
6. distribution active denoising method as described in claim 1, which is characterized in that input module and output module are Mike
Wind and loud speaker.
7. distribution active denoising method as described in claim 1, which is characterized in that the active denoising method can be used for center
The active noise reduction of air conditioning wind pipe machine.
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