CN113838447A - Control method and system of silencer - Google Patents

Control method and system of silencer Download PDF

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Publication number
CN113838447A
CN113838447A CN202111048356.9A CN202111048356A CN113838447A CN 113838447 A CN113838447 A CN 113838447A CN 202111048356 A CN202111048356 A CN 202111048356A CN 113838447 A CN113838447 A CN 113838447A
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area
length
sound
silencing
deadening
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Chinese (zh)
Inventor
张晓�
陈运东
李学瑞
郝建领
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Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Priority to CN202111048356.9A priority Critical patent/CN113838447A/en
Publication of CN113838447A publication Critical patent/CN113838447A/en
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • 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
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17875—General system configurations using an error signal without a reference signal, e.g. pure feedback
    • 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
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3025—Determination of spectrum characteristics, e.g. FFT
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3026—Feedback

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Abstract

The invention provides a control method and a system of a silencer, wherein the method comprises the following steps: acquiring noise data of an air outlet of the silencer; identifying noise data to obtain at least incident acoustic frequency; based on the noise elimination amount calculation function corresponding to the first noise elimination area, the second noise elimination area and the third noise elimination area and a preset length constraint condition, optimizing by taking the maximum total noise elimination amount of the silencer as a target by combining the frequency of incident sound waves, and determining the first optimal length of the first noise elimination area, the second optimal length of the second noise elimination area and the third optimal length of the third noise elimination area; and respectively controlling the first moving plate and the second moving plate, and respectively adjusting the lengths of the first silencing area, the second silencing area and the third silencing area to be a first optimal length, a second optimal length and a third optimal length. The noise generated by air conditioners in different working states or different models is reduced, the noise reduction effect is improved, and the user experience is improved.

Description

Control method and system of silencer
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and a control system of a silencer.
Background
With the development of science and technology, air conditioners become one of the most common electric appliances in daily life. In order to improve the user experience, the noise of the air conditioner generated during the operation of the air conditioner is generally reduced by a silencer.
The current mode of reducing the noise of the air conditioner by using a silencer is as follows: a silencer with a fixed structure is adopted to reduce the noise of the air conditioner with determined frequency. However, because the frequency spectrum difference of the air conditioner noise generated by the compressor of the air conditioner under different working states is large, or the frequency spectrum of the air conditioner noise generated by the air conditioners of different machine types is also large, the silencer adopting the fixed structure form cannot effectively reduce the air conditioner noise, the noise reduction effect is poor, and the user experience is poor.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and a system for controlling a muffler, so as to solve the problems of poor noise reduction effect, poor user experience, and the like in the existing manner of reducing noise of an air conditioner.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the embodiment of the invention discloses a control method of a silencer in a first aspect, which comprises the following steps:
acquiring noise data of an air outlet of the silencer, wherein a cavity of the silencer is divided from the air inlet to the air outlet in sequence: the movable panel comprises a first silencing area, a second silencing area and a third silencing area, wherein a first movable plate is arranged between the first silencing area and the second silencing area, and a second movable plate is arranged between the second silencing area and the third silencing area;
identifying the noise data to obtain at least incident acoustic frequency;
based on the noise elimination amount calculation function corresponding to the first noise elimination area, the second noise elimination area and the third noise elimination area and a preset length constraint condition, combining the incident sound wave frequency, optimizing by taking the maximum total noise elimination amount of the silencer as a target, and determining a first optimal length of the first noise elimination area, a second optimal length of the second noise elimination area and a third optimal length of the third noise elimination area;
and respectively controlling the first moving plate and the second moving plate, and respectively adjusting the lengths of the first silencing area, the second silencing area and the third silencing area to the first optimal length, the second optimal length and the third optimal length.
Preferably, the respectively controlling the first moving plate and the second moving plate to respectively adjust the lengths of the first muffling area, the second muffling area and the third muffling area to the first optimal length, the second optimal length and the third optimal length includes:
determining a control signal based on the current lengths of the first, second and third silence areas in combination with the first, second and third optimal lengths;
and sending the control signal to a silencer adjusting mechanism, so that the silencer adjusting mechanism controls the first moving plate and the second moving plate to move according to the control signal, and adjusting the lengths of the first silencing area, the second silencing area and the third silencing area to be the first optimal length, the second optimal length and the third optimal length respectively.
Preferably, the noise data at least includes spectrum information, and the identifying the noise data at least obtains the frequency of the incident sound wave, including:
from the spectral information of the noise data, the frequency at which the maximum amplitude is obtained is identified and taken as the incident sound wave frequency.
Preferably, the calculation function of the amount of sound attenuation of the first sound attenuation region is Δ T1＝aL1(ii) a The noise elimination quantity calculation function of the second noise elimination region is delta T2＝10lg[1+1/4b2sin2(2πfL2/c)](ii) a The third sound-deadening region has a sound-deadening amount calculation function of
Figure BDA0003251861730000021
Wherein, Delta T1Is the amount of sound deadening, Δ T, of the first muffling area2Is the amount of sound deadening, Δ T, of the second sound deadening region3Is the sound deadening quantity of the third sound deadening region, a, b and d are preset constants, c is the sound velocity, f is the incident sound wave frequency, f is the sound velocityrIs the natural frequency, L, of the third sound-deadening region1Is the length of said first anechoic region, L2Is the length of said second muffling area, L3Is the length of the third sound-deadening zone.
Preferably, the constraint condition of the length of the first anechoic region is 1/3La≤L1≤La+1/2Lb；
The length constraint condition of the second silencing area is that L is more than or equal to 02≤2/3La+Lb+Lc；
The length constraint condition of the third sound-absorbing area is that L is more than or equal to 03≤2/3La+Lb+Lc；
Wherein L is1Is the length of said first anechoic region, L2Is the length of said second muffling area, L3Is the length of the third sound-deadening region, LaIs the initial length, L, of the first muffling area of the muffler in the initial statebIs the initial length, L, of the second sound-deadening region in the initial state of the mufflercIs the initial length of the third sound-deadening zone in the initial state of the muffler.
A second aspect of the embodiments of the present invention discloses a control system of a muffler, the system including:
the acquisition unit is used for acquiring noise data of an air outlet of the silencer, and a cavity of the silencer is divided from the air inlet to the air outlet in sequence: the movable panel comprises a first silencing area, a second silencing area and a third silencing area, wherein a first movable plate is arranged between the first silencing area and the second silencing area, and a second movable plate is arranged between the second silencing area and the third silencing area;
the identification unit is used for identifying the noise data and obtaining at least incident sound wave frequency;
the processing unit is used for optimizing the maximum total muffling amount of the muffler based on the muffling amount calculation function corresponding to the first muffling area, the second muffling area and the third muffling area and a preset length constraint condition in combination with the incident sound wave frequency, and determining a first optimal length of the first muffling area, a second optimal length of the second muffling area and a third optimal length of the third muffling area;
and the control unit is used for respectively controlling the first moving plate and the second moving plate and respectively adjusting the lengths of the first silencing area, the second silencing area and the third silencing area to the first optimal length, the second optimal length and the third optimal length.
Preferably, the control unit is specifically configured to: determining a control signal based on the current lengths of the first, second and third silence areas in combination with the first, second and third optimal lengths; and sending the control signal to a silencer adjusting mechanism, so that the silencer adjusting mechanism controls the first moving plate and the second moving plate to move according to the control signal, and adjusting the lengths of the first silencing area, the second silencing area and the third silencing area to be the first optimal length, the second optimal length and the third optimal length respectively.
Preferably, the noise data at least includes spectrum information, and the identifying unit is specifically configured to: from the spectral information of the noise data, the frequency at which the maximum amplitude is obtained is identified and taken as the incident sound wave frequency.
Preferably, the calculation function of the amount of sound attenuation of the first sound attenuation region is Δ T1＝aL1(ii) a The noise elimination quantity calculation function of the second noise elimination region is delta T2＝10lg[1+1/4b2sin2(2πfL2/c)](ii) a The third sound-deadening region has a sound-deadening amount calculation function of
Figure BDA0003251861730000041
Wherein, Delta T1Is the amount of sound deadening, Δ T, of the first muffling area2Is the amount of sound deadening, Δ T, of the second sound deadening region3Is the sound deadening quantity of the third sound deadening region, a, b and d are preset constants, c is the sound velocity, f is the incident sound wave frequency, f is the sound velocityrIs the natural frequency, L, of the third sound-deadening region1Is the length of said first anechoic region, L2Is the length of said second muffling area, L3Is the length of the third sound-deadening zone.
Preferably, the constraint condition of the length of the first anechoic region is 1/3La≤L1≤La+1/2Lb；
The length constraint condition of the second silencing area is that L is more than or equal to 02≤2/3La+Lb+Lc；
The length constraint condition of the third sound-absorbing area is that L is more than or equal to 03≤2/3La+Lb+Lc；
Wherein L is1Is the length of said first anechoic region, L2Is the length of said second muffling area, L3Is the length of the third sound-deadening region, LaIs the initial length, L, of the first muffling area of the muffler in the initial statebIs the initial length, L, of the second sound-deadening region in the initial state of the mufflercIs the initial length of the third sound-deadening zone in the initial state of the muffler.
Based on the control method and the system for the silencer provided by the embodiment of the invention, the method comprises the following steps: acquiring noise data of an air outlet of the silencer; identifying noise data to obtain at least incident acoustic frequency; based on the noise elimination amount calculation function corresponding to the first noise elimination area, the second noise elimination area and the third noise elimination area and a preset length constraint condition, optimizing by taking the maximum total noise elimination amount of the silencer as a target by combining the frequency of incident sound waves, and determining the first optimal length of the first noise elimination area, the second optimal length of the second noise elimination area and the third optimal length of the third noise elimination area; and respectively controlling the first moving plate and the second moving plate, and respectively adjusting the lengths of the first silencing area, the second silencing area and the third silencing area to be a first optimal length, a second optimal length and a third optimal length. In this scheme, through the noise data of the gas outlet of gathering the silencer to adjust the length in each noise damping district of silencer for optimal length in view of the above, with the produced noise of the air conditioner of the different operating condition of at utmost reduction or different models, improve noise reduction effect and improve user experience.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a muffler provided in an embodiment of the present invention;
fig. 2 is a flowchart of a control method of a muffler according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an architecture for controlling a driving motor to adjust a muffler according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a connection structure between a controller and other devices according to an embodiment of the present invention;
fig. 5 is a block diagram of a control system of a muffler according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
As known from the background art, in order to reduce the noise of the air conditioner, a muffler with a fixed structure is generally used to reduce the noise of the air conditioner with a certain frequency. However, the frequency spectrum difference of noise generated by air conditioners of different models or air conditioners in different working states is large, the noise of the air conditioner cannot be effectively reduced by adopting the silencer of a fixed structure form, the noise reduction effect is poor, and the user experience is poor.
Therefore, the embodiment of the invention provides a control method and a control system of a silencer, which can reduce noise generated by air conditioners in different working states or different types to the maximum extent, improve noise reduction effect and improve user experience by acquiring noise data of an air outlet of the silencer and adjusting the length of each silencing area of the silencer to the optimal length.
It should be noted that, in the muffler according to the embodiments of the present invention, from the inlet to the outlet of the cavity of the muffler, the cavity of the muffler is divided into a first muffling area (which may be replaced by another name, such as a sound absorbing material area), a second muffling area (which may also be referred to as an expansion area), and a third muffling area (which may also be referred to as a resonant cavity) in this order. That is, the air inlet of the cavity of the muffler is connected with the first muffling area, the air outlet of the cavity of the muffler is connected with the third muffling area, and the second muffling area is arranged between the first muffling area and the third muffling area. A first moving plate is arranged between the first silencing area and the second silencing area, a second moving plate is arranged between the second silencing area and the third silencing area, the length of each silencing area (from the first silencing area to the third silencing area) can be adjusted by adjusting the positions of the first moving plate and the second moving plate, and the internal volume of each silencing area is further adjusted.
It can be understood that, in the embodiment of the present invention, the first muffling area of the muffler is used to reduce high frequency noise (e.g., noise in a frequency band above 1000Hz can be defined as high frequency noise), the second muffling area is used to reduce noise in a middle-low frequency band (e.g., noise in a frequency band below 1000Hz can be defined as middle-low frequency band noise), and the third muffling area is used to reduce noise in a middle-low frequency band.
To better explain the muffler according to the embodiment of the present invention, the muffler is illustrated by the schematic structural diagram of the muffler shown in fig. 1. As shown in fig. 1, the position of the air flow flowing into the muffler is an air inlet, the air inlet is connected with a sound absorption material region (a first sound absorption region), the sound absorption material region is connected with an expansion region (a second sound absorption region), the expansion region is connected with a resonance chamber (a third sound absorption region), the resonance chamber is connected with an air outlet (i.e. the position where the air flow flows out), a first moving plate (a moving plate 1 in fig. 1) is arranged between the sound absorption material region and the expansion region, and a second moving plate (a moving plate 2 in fig. 1) is arranged between the expansion region and the resonance chamber.
In FIG. 1, L1Is the length of the sound-absorbing material region, L2To the length of the expansion zone, L3For the length of resonant cavity, can adjust the length of sound-absorbing material district, expanding region and resonant cavity through adjusting first movable plate and second movable plate, and then can adjust the interior volume of sound-absorbing material district, expanding region and resonant cavity.
It is understood that the variations of the interior volume of the sound absorbent region, expansion region and resonant cavity include, but are not limited to, the following 12 variations.
(1) The internal volume of the sound absorption material area is unchanged, the internal volume of the expansion area is increased, and the internal volume of the resonant cavity is reduced.
(2) The internal volume of the sound absorption material area is unchanged, the internal volume of the expansion area is reduced, and the internal volume of the resonant cavity is enlarged.
(3) The internal volume of the sound absorption material area is reduced, the internal volume of the expansion area is reduced, and the internal volume of the resonant cavity is increased.
(4) The internal volume of the sound absorption material area is reduced, the internal volume of the expansion area is increased, and the internal volume of the resonant cavity is reduced.
(5) The internal volume of the sound absorption material area becomes smaller, the internal volume of the expansion area becomes larger, and the internal volume of the resonant cavity becomes larger.
(6) The internal volume of the sound absorption material area is reduced, the internal volume of the expansion area is unchanged, and the internal volume of the resonant cavity is increased.
(7) The inner volume of the sound absorption material area is reduced, the inner volume of the expansion area is increased, and the inner volume of the resonant cavity is unchanged.
(8) The volume of the sound-absorbing material area is increased, the volume of the expansion area is increased, and the volume of the resonant cavity is decreased.
(9) The volume of the sound-absorbing material area is increased, the volume of the expansion area is decreased, and the volume of the resonant cavity is increased.
(10) The volume of the sound-absorbing material area is increased, the volume of the expansion area is decreased, and the volume of the resonant cavity is decreased.
(11) The volume of the sound absorption material area is increased, the volume of the expansion area is unchanged, and the volume of the resonant cavity is decreased.
(12) The volume of the sound absorption material area is increased, the volume of the expansion area is decreased, and the volume of the resonant cavity is unchanged.
The above is an exemplary content about the architecture of the silencer according to the embodiment of the present invention, and the details of the embodiment of the present invention are as follows.
It should be noted that the method and system for controlling a muffler according to the embodiments of the present invention are applicable to a controller such as a Micro Control Unit (MCU).
Referring to fig. 2, a flowchart of a control method of a muffler according to an embodiment of the present invention is shown, where the control method includes:
step S201: noise data of an air outlet of the muffler is acquired.
It should be noted that the cavity of the muffler is divided into: the specific structure of the muffler can refer to the example content shown in fig. 1, and details are not repeated here.
In the process of implementing step S201 specifically, acquiring initial noise data of the air outlet of the muffler by a sound acquisition device (such as a microphone); the initial noise data is analyzed by an analyzing device (e.g., a spectrum analyzer) to obtain the noise data obtained in step S201, where the noise data at least includes spectral information (e.g., acoustic characteristic parameters such as frequency domain, amplitude information, frequency, and sound pressure level).
It can be understood that the initial noise data acquired by the sound acquisition device is a time domain signal, the analysis device performs fast fourier transform on the initial noise data, and converts the initial noise data into a frequency domain signal, and the frequency domain signal converted by the analysis device is the noise data acquired in step S201.
In summary, the noise data of the outlet of the muffler acquired in step S201 is the noise data processed by the analysis device.
Step S202: noise data is identified, and at least the incident acoustic wave frequency is obtained.
In the process of implementing step S202 specifically, noise data (frequency domain signal) is identified, and from the spectrum information of the noise data, a frequency (or frequency segment) at which the maximum amplitude is obtained is identified and taken as the incident sound wave frequency.
Step S203: based on the noise elimination amount calculation function corresponding to the first noise elimination area, the second noise elimination area and the third noise elimination area and the preset length constraint condition, the maximum total noise elimination amount of the silencer is optimized by combining the frequency of incident sound waves, and the first optimal length of the first noise elimination area, the second optimal length of the second noise elimination area and the third optimal length of the third noise elimination area are determined.
As can be seen from the above description in fig. 1, the first, second and third muffling areas of the muffler are used to reduce noise generated by the air conditioner, specifically, the noise reduction effect of each muffling area is expressed by a muffling amount, and the muffling amount of each muffling area can be calculated by a corresponding muffling amount calculation function.
In some embodiments, the amount of sound attenuation Δ T for the first sound attenuation zone1Is related to the length of the first muffling area, and the calculation function of the muffling amount of the first muffling area is as formula (1).
ΔT1＝aL1 (1)
In the formula (1), L1A is a predetermined constant for the length of the first muffling area, a being related to the muffler cross-sectional dimensions and the material (e.g., sound absorbing material) of the first muffling area.
Noise elimination amount Delta T of second noise elimination region2Is related to the length of the second muffling area, and the muffling amount of the second muffling area is calculated as a function of equation (2).
ΔT2＝10lg[1+1/4b2sin2(2πfL2/c)] (2)
In the formula (2), L2Is the length of the second muffling area, f is the incident sound wave frequency, b is a predetermined constant, b is related to the muffler cross-sectional size and the material (e.g., sound absorbing material) of the second muffling area, and c is the sound velocity.
Noise elimination quantity delta T of third noise elimination area3Is related to the length of the third sound-deadening region, and the sound-deadening amount of the third sound-deadening region is calculated as a function of equation (3).
Figure BDA0003251861730000091
In the formula (3), L3Is the length of the third sound-deadening region, f is the incident sound frequency, frIs the third herbThe natural frequency of the sound zone, d is a preset constant, and d is related to the structural size of the silencer.
In some embodiments, the lengths of the first, second and third muffling areas of the muffler have corresponding preset length constraints, the length constraint of the first muffling area is used for defining the length variation range of the first muffling area, the length constraint of the second muffling area is used for defining the length variation range of the second muffling area, and the length constraint of the third muffling area is used for defining the length variation range of the third muffling area.
In some embodiments, the length constraint of the first muffling area is: 1/3La≤L1≤La+1/2Lb(ii) a The length constraint conditions of the second muffling area are as follows: l is more than or equal to 02≤2/3La+Lb+Lc(ii) a The length constraint condition of the third silencing area is that L is more than or equal to 03≤2/3La+Lb+Lc. Wherein L is1Is the length of the first muffling area, L2Is the length of the second muffling area, L3Is the length of the third sound-deadening region, LaIs the initial length of the first muffling area of the muffler in the initial state, LbIs the initial length of the second muffling area, L, of the muffler in the initial statecThe initial length of the third sound-deadening zone in the initial state of the muffler. It should be noted that, in the initial state, the muffler specifically means: the length of each muffling area in the muffler is never adjusted. That is, the initial length of each muffling area is a preset and constant value.
It is understood that the total amount of sound attenuation of the muffler is equal to the amount of sound attenuation of the first sound attenuation region + the amount of sound attenuation of the second sound attenuation region + the amount of sound attenuation of the third sound attenuation region.
In the process of specifically implementing step S203, based on the muffling amount calculation function of the first muffling area (formula (1)), the muffling amount calculation function of the second muffling area (formula (2)), the muffling amount calculation function of the third muffling area (formula (3)), the length constraint condition of the first muffling area, the length constraint condition of the second muffling area, the length constraint condition of the third muffling area, and the incident sound wave frequency, optimizing with the maximum total muffling amount of the muffler being a target, and determining a first optimal length of the first muffling area, a second optimal length of the second muffling area, and a third optimal length of the third muffling area; it is understood that the first optimal length satisfies a length constraint of the first muffling area, the second optimal length satisfies a length constraint of the second muffling area, and the third optimal length satisfies a length constraint of the third muffling area.
That is, on the premise that the length of each muffling area satisfies the corresponding length constraint condition, the maximum total muffling amount of the muffler is taken as a target, and the length of each muffling area is optimized by combining the incident sound wave frequency and the muffling amount calculation function for calculating the muffling amount shown in the above formulas (1) to (3), so as to find the first optimal length, the second optimal length, and the third optimal length which maximize the total muffling amount.
Step S204: and respectively controlling the first moving plate and the second moving plate, and respectively adjusting the lengths of the first silencing area, the second silencing area and the third silencing area to be a first optimal length, a second optimal length and a third optimal length.
It is understood that the lengths of the first, second, and third muffling areas can be adjusted by controlling the first moving plate to move leftward or rightward and the second moving plate to move leftward or rightward by the muffler adjusting mechanism.
It should be noted that the driving form of the muffler adjusting mechanism is electric driving, hydraulic driving, or pneumatic driving.
In the process of specifically implementing step S204, a control signal is determined based on the current lengths of the first, second, and third silence areas in combination with the first, second, and third optimal lengths; and sending the control signal to a silencer adjusting mechanism, so that the silencer adjusting mechanism controls the first moving plate and the second moving plate to move according to the control signal, and adjusting the lengths of the first silencing area, the second silencing area and the third silencing area to be the first optimal length, the second optimal length and the third optimal length respectively.
That is, the muffler adjusting mechanism may move the first moving plate and the second moving plate according to the control signal, adjust the length of the first muffling area from the current length to the first optimal length, adjust the length of the second muffling area from the current length to the second optimal length, and adjust the length of the third muffling area from the current length to the third optimal length.
For example: assuming that the driving form of the muffler adjusting mechanism is electric driving, the control signal includes the rotation angle of the driving motor, so that the muffler adjusting mechanism controls the driving motor to rotate by a specified angle (the angle included in the control signal), and further adjusts the lengths of the first muffling area, the second muffling area and the third muffling area from the current length to the first optimal length, the second optimal length and the third optimal length, respectively.
To better explain how the muffler adjustment mechanism is used to adjust the length of each muffling area, the schematic diagram of the structure of controlling the driving motor to adjust the muffler shown in fig. 3 is used for illustration.
In fig. 3, the muffler adjusting mechanism is driven electrically, and includes: the device comprises a driving motor 1, a gear rack mechanism 1, a driving motor 2 and a gear rack mechanism 2. After the MCU controller determines a control signal based on the current lengths of the first, second and third muffling areas and in combination with the first, second and third optimal lengths, the MCU controller sends the control signal to the driving motor 1 and the driving motor 2. The driving motor 1 rotates according to the angle in the control signal to drive the rack and pinion mechanism 1 to move, so that the moving plate 1 (first moving plate) is controlled to move; the driving motor 2 rotates according to the angle in the control signal to drive the rack and pinion mechanism 2 to move, so that the moving plate 2 (a second moving plate) is controlled to move; finally, the lengths of the sound absorption material area (the first sound absorption area), the expansion area (the second sound absorption area) and the resonant cavity (the third sound absorption area) are adjusted.
It should be noted that the forward rotation of the driving motor shown in fig. 3 may drive the rack-and-pinion mechanism to move leftward, so as to move the moving plate leftward, and the reverse rotation of the driving motor may drive the rack-and-pinion mechanism to move rightward, so as to move the moving plate rightward. Similarly, there may be another case: the reverse rotation of the drive motor shown in fig. 3 may drive the rack and pinion mechanism to move leftward, which in turn moves the moving plate leftward, and the forward rotation of the drive motor may drive the rack and pinion mechanism to move rightward, which in turn moves the moving plate rightward.
In summary, the controller combines the sound collecting device, the analyzing device and the muffler adjusting mechanism to adjust the length of each muffling area of the muffler, and for better explaining the linkage between the controller and other devices, the schematic diagram of the connection structure between the controller and other devices shown in fig. 4 is used for illustration.
In fig. 4, a microphone (sound collection device) collects initial noise data of an air outlet of a muffler, and sends the initial noise data to a spectrum analyzer (analysis device) for processing to obtain a frequency domain signal (noise data); the spectrum analyzer sends the noise data to the MCU controller for processing to obtain a control signal (see above for the process of determining the control signal); the MCU controller sends a control signal to the silencer adjusting mechanism, and the silencer adjusting mechanism adjusts the lengths of the first silencing area, the second silencing area and the third silencing area of the silencer to be the first optimal length, the second optimal length and the third optimal length respectively.
In conclusion, the lengths of the first silencing area, the second silencing area and the third silencing area of the silencer are adjusted by acquiring the noise data of the air outlet of the silencer in real time, so that the total silencing quantity of the silencer under different conditions is ensured to be maximum, the sound absorption, silencing and sound insulation effects are realized, and the noise generated by air conditioners under different working conditions or different models is reduced to the maximum extent.
In the embodiment of the invention, the noise data of the air outlet of the silencer is collected, and the length of each silencing area of the silencer is adjusted to be the optimal length, so that the noise generated by air conditioners in different working states or different models is reduced to the maximum extent, the noise reduction effect is improved, and the user experience is improved.
Corresponding to the control method of the muffler provided by the above embodiment of the present invention, referring to fig. 5, the embodiment of the present invention further provides a structural block diagram of a control system of the muffler, where the control system includes: an acquisition unit 501, a recognition unit 502, a processing unit 503, and a control unit 504;
the obtaining unit 501 is configured to obtain noise data of an air outlet of the muffler, and a cavity of the muffler is sequentially divided from the air inlet to the air outlet: the first silencing area, the second silencing area and the third silencing area are arranged, a first moving plate is arranged between the first silencing area and the second silencing area, and a second moving plate is arranged between the second silencing area and the third silencing area.
The identification unit 502 is used for identifying noise data and obtaining at least incident sound wave frequency.
In a specific implementation, the noise data at least includes spectrum information, and the identifying unit 502 is specifically configured to: from the spectral information of the noise data, the frequency at which the maximum amplitude is obtained is identified and taken as the incident sound wave frequency.
The processing unit 503 is configured to perform optimization on the basis of the noise canceling amount calculation function corresponding to the first noise canceling area, the second noise canceling area, and the third noise canceling area and a preset length constraint condition, and by combining the incident sound wave frequency, with the maximum total noise canceling amount of the muffler as a target, determine a first optimal length of the first noise canceling area, a second optimal length of the second noise canceling area, and a third optimal length of the third noise canceling area.
In a specific implementation, the calculation function of the muffling amount of the first muffling area is the above formula (1); the sound-deadening amount calculation function of the second sound-deadening region is the above formula (2); the sound-deadening amount calculation function of the third sound-deadening region is the above equation (3).
In a specific implementation, the constraint on the length of the first muffling area is 1/3La≤L1≤La+1/2Lb(ii) a The length constraint condition of the second muffling area is that L is more than or equal to 02≤2/3La+Lb+Lc(ii) a The length constraint condition of the third silencing area is that L is more than or equal to 03≤2/3La+Lb+Lc(ii) a Wherein L is1Is the length of the first muffling area, L2Is the length of the second muffling area, L3Is the length of the third sound-deadening region, LaIs the initial length of the first muffling area of the muffler in the initial state, LbIs a silencerInitial length of the second muffling area in the initial state, LcThe initial length of the third sound-deadening zone in the initial state of the muffler.
A control unit 504, configured to control the first moving plate and the second moving plate respectively, and adjust the lengths of the first muffling area, the second muffling area, and the third muffling area to a first optimal length, a second optimal length, and a third optimal length, respectively.
In a specific implementation, the control unit 504 is specifically configured to: determining a control signal based on the current lengths of the first, second and third silence areas in combination with the first, second and third optimal lengths; and sending the control signal to a silencer adjusting mechanism, so that the silencer adjusting mechanism controls the first moving plate and the second moving plate to move according to the control signal, and adjusting the lengths of the first silencing area, the second silencing area and the third silencing area to be the first optimal length, the second optimal length and the third optimal length respectively.
In the embodiment of the invention, the noise data of the air outlet of the silencer is collected, and the length of each silencing area of the silencer is adjusted to be the optimal length, so that the noise generated by air conditioners in different working states or different models is reduced to the maximum extent, the noise reduction effect is improved, and the user experience is improved.
In summary, embodiments of the present invention provide a method and a system for controlling a muffler, so as to obtain noise data of an air outlet of the muffler. Noise data is identified, and at least the incident acoustic wave frequency is obtained. Based on the noise elimination amount calculation function corresponding to the first noise elimination area, the second noise elimination area and the third noise elimination area and the preset length constraint condition, the maximum total noise elimination amount of the silencer is optimized by combining the frequency of incident sound waves, and the first optimal length of the first noise elimination area, the second optimal length of the second noise elimination area and the third optimal length of the third noise elimination area are determined. And respectively controlling the first moving plate and the second moving plate, and respectively adjusting the lengths of the first silencing area, the second silencing area and the third silencing area to be a first optimal length, a second optimal length and a third optimal length. The noise generated by air conditioners in different working states or different models is reduced to the maximum extent, and the noise reduction effect and the user experience are improved.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A method of controlling a muffler, the method comprising:
acquiring noise data of an air outlet of the silencer, wherein a cavity of the silencer is divided from the air inlet to the air outlet in sequence: the movable panel comprises a first silencing area, a second silencing area and a third silencing area, wherein a first movable plate is arranged between the first silencing area and the second silencing area, and a second movable plate is arranged between the second silencing area and the third silencing area;
identifying the noise data to obtain at least incident acoustic frequency;
based on the noise elimination amount calculation function corresponding to the first noise elimination area, the second noise elimination area and the third noise elimination area and a preset length constraint condition, combining the incident sound wave frequency, optimizing by taking the maximum total noise elimination amount of the silencer as a target, and determining a first optimal length of the first noise elimination area, a second optimal length of the second noise elimination area and a third optimal length of the third noise elimination area;
and respectively controlling the first moving plate and the second moving plate, and respectively adjusting the lengths of the first silencing area, the second silencing area and the third silencing area to the first optimal length, the second optimal length and the third optimal length.
2. The method of claim 1, wherein said separately controlling said first and second moving plates to adjust the lengths of said first, second and third muffling zones to said first, second and third optimal lengths, respectively, comprises:
determining a control signal based on the current lengths of the first, second and third silence areas in combination with the first, second and third optimal lengths;
and sending the control signal to a silencer adjusting mechanism, so that the silencer adjusting mechanism controls the first moving plate and the second moving plate to move according to the control signal, and adjusting the lengths of the first silencing area, the second silencing area and the third silencing area to be the first optimal length, the second optimal length and the third optimal length respectively.
3. The method of claim 1, wherein the noise data includes at least spectral information, and wherein identifying the noise data, resulting in at least an incident acoustic frequency, comprises:
from the spectral information of the noise data, the frequency at which the maximum amplitude is obtained is identified and taken as the incident sound wave frequency.
4. The method of claim 1, wherein the first anechoic region has an anechoic amount calculation function of Δ T1＝aL1(ii) a The noise elimination quantity calculation function of the second noise elimination region is delta T2＝10lg[1+1/4b2sin2(2πfL2/c)](ii) a The third sound-deadening region has a sound-deadening amount calculation function of
Figure FDA0003251861720000021
Wherein, Delta T1Is the amount of sound deadening, DeltaT, of the first sound deadening region2Is the amount of sound deadening, DeltaT, of the second sound deadening region3Is the sound deadening quantity of the third sound deadening region, a, b and d are preset constants, c is the sound velocity, f is the incident sound wave frequency, f is the sound velocityrIs the natural frequency, L, of the third sound-deadening region1Is the length of said first anechoic region, L2Is the length of said second muffling area, L3Is the length of the third sound-deadening zone.
5. The method of claim 1, wherein the length constraint of the first anechoic region is 1/3La≤L1≤La+1/2Lb；
The length constraint condition of the second silencing area is that L is more than or equal to 02≤2/3La+Lb+Lc；
The length constraint condition of the third sound-absorbing area is that L is more than or equal to 03≤2/3La+Lb+Lc；
Wherein L is1Is the length of said first anechoic region, L2Is the length of said second muffling area, L3Is the length of the third sound-deadening region, LaIs the initial length, L, of the first muffling area of the muffler in the initial statebIs the initial length, L, of the second sound-deadening region in the initial state of the mufflercIs the initial length of the third sound-deadening zone in the initial state of the muffler.
6. A control system for a muffler, the system comprising:
the acquisition unit is used for acquiring noise data of an air outlet of the silencer, and a cavity of the silencer is divided from the air inlet to the air outlet in sequence: the movable panel comprises a first silencing area, a second silencing area and a third silencing area, wherein a first movable plate is arranged between the first silencing area and the second silencing area, and a second movable plate is arranged between the second silencing area and the third silencing area;
the identification unit is used for identifying the noise data and obtaining at least incident sound wave frequency;
the processing unit is used for optimizing the maximum total muffling amount of the muffler based on the muffling amount calculation function corresponding to the first muffling area, the second muffling area and the third muffling area and a preset length constraint condition in combination with the incident sound wave frequency, and determining a first optimal length of the first muffling area, a second optimal length of the second muffling area and a third optimal length of the third muffling area;
and the control unit is used for respectively controlling the first moving plate and the second moving plate and respectively adjusting the lengths of the first silencing area, the second silencing area and the third silencing area to the first optimal length, the second optimal length and the third optimal length.
7. The system according to claim 6, wherein the control unit is specifically configured to: determining a control signal based on the current lengths of the first, second and third silence areas in combination with the first, second and third optimal lengths; and sending the control signal to a silencer adjusting mechanism, so that the silencer adjusting mechanism controls the first moving plate and the second moving plate to move according to the control signal, and adjusting the lengths of the first silencing area, the second silencing area and the third silencing area to be the first optimal length, the second optimal length and the third optimal length respectively.
8. The system according to claim 6, characterized in that said noise data comprise at least spectral information, said identification unit being in particular configured to: from the spectral information of the noise data, the frequency at which the maximum amplitude is obtained is identified and taken as the incident sound wave frequency.
9. The system of claim 6, wherein the first anechoic region has an anechoic amount calculation function of Δ T1＝aL1(ii) a The noise elimination quantity calculation function of the second noise elimination region is delta T2＝10lg[1+1/4b2sin2(2πfL2/c)](ii) a The third sound-deadening region has a sound-deadening amount calculation function of
Figure FDA0003251861720000031
Wherein, Delta T1Is the amount of sound deadening, DeltaT, of the first sound deadening region2Is the amount of sound deadening, DeltaT, of the second sound deadening region3Is the sound deadening quantity of the third sound deadening region, a, b and d are preset constants, c is the sound velocity, f is the incident sound wave frequency, f is the sound velocityrIs the natural frequency, L, of the third sound-deadening region1Is the length of said first anechoic region, L2Is the length of said second muffling area, L3Is the length of the third sound-deadening zone.
10. The system of claim 6, wherein the length constraint of the first anechoic region is 1/3La≤L1≤La+1/2Lb；
The length constraint condition of the second silencing area is that L is more than or equal to 02≤2/3La+Lb+Lc；
The length constraint condition of the third sound-absorbing area is that L is more than or equal to 03≤2/3La+Lb+Lc；
Wherein L is1Is the length of said first anechoic region, L2Is the length of said second muffling area, L3Is the length of the third sound-deadening region, LaIs the initial length, L, of the first muffling area of the muffler in the initial statebIs the initial length, L, of the second sound-deadening region in the initial state of the mufflercIs the initial length of the third sound-deadening zone in the initial state of the muffler.
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JPH116172A (en) * 1997-06-17 1999-01-12 Hitachi Constr Mach Co Ltd Silencer
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