CN111161701A - Active noise control system of air conditioner fan - Google Patents
Active noise control system of air conditioner fan Download PDFInfo
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- CN111161701A CN111161701A CN201911374669.6A CN201911374669A CN111161701A CN 111161701 A CN111161701 A CN 111161701A CN 201911374669 A CN201911374669 A CN 201911374669A CN 111161701 A CN111161701 A CN 111161701A
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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
- 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
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17853—Methods, e.g. algorithms; Devices of the filter
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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
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- 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
- G10K11/175—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
- G10K11/1781—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
- G10K11/17813—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
- G10K11/17817—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms between the output signals and the error signals, i.e. secondary path
-
- 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
- G10K11/1781—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
- G10K11/17821—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
-
- 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
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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)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention relates to the technical field of noise reduction, in particular to an active noise control system of an air conditioner fan, which comprises: the signal conversion unit is used for converting acoustic signals of noise at the air conditioner fan into electric signals; the controller receives the electric signal of the signal conversion unit to generate a control signal of interference noise; the active noise control algorithm based on FxLMS is characterized in that a controller provides a physical platform for the active noise control algorithm based on FxLMS, the active noise control algorithm based on FxLMS adjusts the self control coefficient of the controller, the controller outputs a control method which reaches a monitoring point after passing through a specific physical channel and enables a target function to reach the minimum, and a secondary actuator generates secondary sound output after receiving a control signal of the controller; the error sensor is used for picking up interference sound field signals generated by the secondary actuator and feeding back the interference sound field signals to the controller, the system is reasonable in design, simple in structure and stable in operation, and noise of the air conditioner fan can be effectively reduced.
Description
Technical Field
The invention belongs to the technical field of noise reduction, and particularly relates to an active noise control system of an air conditioner fan.
Background
With the pursuit of higher quality of life, the popularity of air conditioners is higher and higher, especially for household air conditioners, and the situation of steady increase is kept in recent years. When the air conditioner is selected by people, the requirements on the performance of each aspect of the air conditioner are met, the requirements on basic performances such as temperature control and electric energy consumption of refrigeration and heating are met, and the requirements on the extension performance in the aspects of use comfort, noise vibration and user experience are met. The indoor unit of the household air conditioner is used as the part which is most contacted with the life of people in the using process of the household air conditioner, and the requirements of people on the indoor unit are more and more strict. And studies have shown that excessive noise over a long period of time can cause harm to a person's body. Based on the characteristics of long-time and uninterrupted use of the household air conditioner in the use process, the noise reduction of the indoor unit is also important.
For a household air conditioner, noise is divided into outdoor unit noise and indoor unit noise. As far as the household air conditioner indoor unit concerned here is concerned, the noise mainly includes the following three parts. The first is the noise of the motor, and the main components are the electromagnetic noise and the rotation noise of the motor; secondly, the noise of the fan, the main components are mechanical noise and eddy noise; the third is noise generated when the refrigerant flows. The noise of the fan is the most important, and is a difficult point in the noise reduction process of the indoor unit.
The active noise reduction (active noise control) technology is generated as a supplement to the passive noise control technology, and fills the blank of the passive noise control in the low-frequency noise reduction field. The core idea is that sound waves with the same frequency and 180-degree phase difference with the original noise are generated, and the two sound waves meet in space to generate a cancellation effect, so that the purpose of noise elimination is achieved. And with the updating and upgrading of electronic chip products, the performance of the electronic chip products is more and more powerful, and the implementation cost of active noise reduction is also reduced. The active noise reduction technology is also gradually applied to the life of people, and the requirements of people on riding comfort are met by adding an active noise reduction function into the existing middle and high-end vehicle types. In people's daily life, there is the noise problem in the operation of domestic air-conditioner indoor cabinet machine, and especially use along with the increase of service life, its noise is more obvious. If the people live and work in such a noise environment for a long time, certain harm can be caused to the health of people. Studies have shown that human sleep is already affected to some extent in a 40 to 45dB noisy environment. Lower values of noise can also be affected for people with generally greater stress and neurasthenia. It is recommended that the daily life noise should not be higher than 35dB and the daily office noise should not be higher than 45 dB. Most of the current household air conditioners can not meet the requirement, so the noise of the air conditioner is reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing an active noise control system of an air conditioner fan, which has the advantages of reasonable system design, simple structure, stable operation and capability of effectively reducing the noise of the air conditioner fan.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an air conditioner fan active noise control system comprising:
the signal conversion unit is fixed at an air outlet of the air conditioner fan and used for converting acoustic signals of noise at the air conditioner fan into electric signals;
the controller is used for receiving the electric signal of the signal conversion unit to generate a control signal of interference noise, and the output end of the signal conversion unit is connected with the input end of the controller;
the active noise control method comprises the steps that an FxLMS-based active noise control algorithm is adopted, a controller provides a physical platform for the FxLMS-based active noise control algorithm, the FxLMS-based active noise control algorithm adjusts the self control coefficient of the controller, the controller outputs a control method which passes through a specific physical channel and then reaches a monitoring point to enable a target function to reach the minimum, and a signal conversion unit provides an initial reference noise signal for an active noise control unit;
the secondary actuator generates secondary sound output after receiving the control signal of the controller, and the input end of the secondary actuator is connected with the output end of the active noise control unit;
and the error sensor is used for picking up an interference sound field signal generated by the secondary actuator and feeding back the interference sound field signal to the controller, and the output end of the error sensor is connected with the input end of the controller.
Preferably, the number conversion unit is a reference microphone.
Preferably, the secondary actuator is a secondary speaker.
Preferably, the controller comprises a filter, an FxLMS-based active noise adaptive algorithm, a secondary modeling channel module and a primary modeling channel module.
The active noise control algorithm based on FxLMS comprises the following steps:
1) selecting the length (the filtering frequency band range) L of a filter and a convergence coefficient mu;
2) secondary channel transfer function identification;
3) filter full coefficient initialization: w (0) ═ 0;
4) iterative loop operation:
where x (n) is the initial reference noise signal, x '(n) is the filtered signal, y (n) is the filter output signal, d (n) is the filter desired signal, y' (n) is the anti-noise signal, hp(n) is the primary channel transfer function, hs(n) is the subchannel transfer function, e (n) is the error signal, W (n) is the filter weights, and W (n +1) is the filter update weights.
The invention has the beneficial effects that: by adopting the scheme, the method has the advantages that,
1) the active noise control algorithm and the active noise control hardware platform analyze the characteristics of the air conditioner noise signal by reading the electric signal of the signal conversion unit, and then control the signal to the secondary actuator in real time, so that the secondary actuator generates secondary sound at the air conditioner control point and superposes the secondary sound with the air conditioner noise, and the purpose of noise at the air outlet of the air conditioner is achieved.
2) The air conditioner noise can be controlled more quickly based on the FxLMS algorithm and has good control quality, and the control system is simple in design and easy to implement.
Drawings
The foregoing and other objects, features, and advantages of the invention will be apparent from the following detailed description taken in conjunction with the accompanying drawings.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic diagram illustrating the principle of the FxLMS-based active noise control algorithm according to the present invention.
Wherein: the device comprises a secondary actuator 1, an air outlet 2, an air conditioner fan 3, a signal conversion unit 4, a controller 5 and an error sensor 6.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Example 1: referring to fig. 1, an active noise control system of an air conditioner blower includes:
a signal conversion unit 4 fixed at the air outlet of the air-conditioning fan 3 for converting the acoustic signal of the noise at the air-conditioning fan 3 into an electrical signal, the signal conversion unit 4 preferably adopts a reference microphone,
a controller 5 for generating a control signal of interference noise, an output terminal of the signal conversion unit is connected with an input terminal of the controller, an active noise control algorithm based on FxLMS adjusts a self control coefficient of the controller, the controller outputs a control method for minimizing a target function by reaching a monitoring point after passing through a specific physical channel, a signal conversion unit 4 for providing an initial reference noise signal for the active noise control unit, the controller provides a physical platform for the active noise control algorithm based on FxLMS,
the secondary actuator 1, the secondary actuator 1 preferably adopts a secondary loudspeaker, and is used for generating secondary sound output after receiving the noise control signal of the active noise control unit to perform inverse interference on noise and reduce the noise value, the input end of the secondary actuator is connected with the output end of the active noise control unit,
Referring to fig. 2, noise generated by the air-conditioning fan 3 is picked up by a reference sensor and converted into an electric signal, i.e., an initial reference noise signal x (n), the initial reference noise signal x (n) is used as an input signal of a controller, the controller calculates a filter expected signal d (n) based on an active noise adaptive algorithm of FxLMS and outputs the filter expected signal d (n), the filter expected signal d (n) drives a secondary actuator to generate a primary sound, the initial reference noise signal x (n) calculates a filter output signal y (n) based on the active noise adaptive algorithm of FxLMS through the controller, the filter output signal y (n) further calculates an anti-noise signal y '(n) based on the active noise adaptive algorithm of FxLMS through the controller, the anti-noise signal y' (n) drives the secondary actuator to generate a secondary sound, and the secondary sound and the primary sound respectively form a secondary sound field, a primary sound field, and, The noise reduction method comprises the steps that a primary sound field acts together to perform interference noise reduction on noise of an air conditioner fan, an error sensor picks up sound pressures of the primary sound field and a secondary sound field, an error signal e (n) is formed after the secondary sound field, secondary sound of the primary sound field and primary sound are superposed, an initial reference noise signal x (n) is calculated through a controller based on an active noise adaptive algorithm of FxLMS to obtain a filtering signal x '(n), the error signal e (n) and the filtering signal x' (n) are input into the controller, the controller weight coefficient is adjusted according to a preset control target based on the active noise adaptive algorithm of the FxLMS to change the signal strength of the primary sound and the secondary sound, and the steps are repeated until the control target is met, and the system is stable and noise reduction is performed continuously.
The controller and the active noise control algorithm analyze the characteristics of the air conditioner noise signal by reading the electric signal of the signal conversion unit, and then control the signal to the secondary actuator in real time, so that the primary sound, the secondary sound and the air conditioner noise are superposed at the air conditioner control point to achieve the purpose of the noise at the air conditioner air outlet.
The controller includes: the system comprises a filter, an FxLMS-based active noise adaptive algorithm, a secondary modeling channel module and a primary modeling channel module; an initial reference noise signal x (n) is obtained through a primary modeling channel module under the calculation of an FxLMS-based active noise adaptive algorithm to obtain a filter expected signal d (n), the initial reference noise signal x (n) is input into a filter, the filter filters the filter to obtain a filter output signal y (n), the filter output signal y (n) is obtained through a secondary modeling channel module under the calculation of the FxLMS-based active noise adaptive algorithm to obtain an anti-noise signal y ' (n), the initial reference noise signal x (n) is obtained through a secondary modeling channel module to obtain a filter signal x ' (n), a secondary sound field picked by an error sensor, a secondary sound of the primary sound field and the primary sound form an error signal e (n) after the calculation and superposition of the FxLMS-based active noise adaptive algorithm, and the filter signal x ' (n), And (3) inputting the error signal e (n) into the filter under the action of the FxLMS-based active noise adaptive algorithm, updating the weight coefficient of the filter according to the preset value by the FxLMS-based active noise adaptive algorithm so as to change the strength of the signals of the primary sound and the secondary sound, and circulating the steps.
The active noise control algorithm based on FxLMS comprises the following steps:
1) selecting the length (the filtering frequency band range) L of a filter and a convergence coefficient mu;
2) secondary channel transfer function identification;
3) filter full coefficient initialization: w (0) ═ 0;
4) iterative loop operation:
where x (n) is the initial reference noise signal, x '(n) is the filtered signal, y (n) is the filter output signal, d (n) is the filter desired signal, y' (n) is the anti-noise signal, hp(n) is the primary channel transfer function, hs(n) is a secondary channel transfer function, e (n) is an error signal, W (n) is a filter weight, W (n +1) is a filter updating weight, and a proper one is selected according to the noise characteristic of the air-conditioning fanThe filter inputs the initial reference noise signal after measurement, and the obtained filtering output signal is more accurate according to the cyclic operation of the flow, the obtained interference sound field is more stable, the interference noise reduction effect on the noise of the air conditioner fan is better, the system operation is stable, and the system can effectively and stably operate.
Example 2: an air conditioner fan active noise control system comprising: the signal conversion unit 4 is fixed at an air outlet of the air conditioner fan 3 and used for converting an acoustic signal of noise at the air conditioner fan 3 into an electric signal, the signal conversion unit 4 preferably adopts an acoustic signal sensor, a controller and a control signal for generating interference noise, the output end of the signal conversion unit is connected with the input end of the controller, the active noise control algorithm based on FxLMS adjusts the self control coefficient of the controller, the controller outputs a control method for reaching a monitoring point after passing through a specific physical channel and minimizing a target function, the signal conversion unit 4 provides an initial reference noise signal for the active noise control unit, the controller provides a physical platform for the active noise control algorithm based on FxLMS, the secondary actuator 1 preferably adopts a secondary loudspeaker and is used for generating secondary acoustic output to perform phase-inverted interference on the noise after receiving the noise control signal of the active noise control unit, the noise reduction device comprises a secondary actuator, an error sensor, a controller and an active noise control unit, wherein the input end of the secondary actuator is connected with the output end of the active noise control unit, the error sensor is used for picking up interference sound field signals generated by the secondary actuator, feeding back the interference sound field signals to the controller, timely correcting the control signals, improving the accuracy of the control signals and the noise reduction effect, and the output end of the error sensor is connected with the input end of the controller.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiment according to the present invention are within the scope of the present invention.
Claims (5)
1. An air conditioner fan active noise control system, comprising:
the signal conversion unit is fixed at an air outlet of the air conditioner fan and used for converting acoustic signals of noise at the air conditioner fan into electric signals;
the controller is used for receiving the electric signal of the signal conversion unit to generate a control signal of interference noise, and the output end of the signal conversion unit is connected with the input end of the controller;
the active noise control method comprises the steps that an FxLMS-based active noise control algorithm is adopted, a controller provides a physical platform for the FxLMS-based active noise control algorithm, the FxLMS-based active noise control algorithm adjusts the self control coefficient of the controller, the controller outputs a control method which passes through a specific physical channel and then reaches a monitoring point to enable a target function to reach the minimum, and a signal conversion unit provides an initial reference noise signal for an active noise control unit;
a secondary actuator for generating a secondary sound output after receiving the control signal of the controller, wherein the input end of the secondary actuator is connected with the output end of the active noise control unit,
and the error sensor is used for picking up an interference sound field signal generated by the secondary actuator and feeding back the interference sound field signal to the controller, and the output end of the error sensor is connected with the input end of the controller.
2. An active noise control system of an air conditioner according to claim 1, wherein said signal conversion unit is a reference microphone.
3. An active noise control system for an air conditioner according to claim 1, wherein said secondary actuator is a secondary speaker.
4. An active noise control system of an air conditioner according to claim 1, wherein the controller includes a filter, an active noise adaptive algorithm based on FxLMS, a secondary modeling channel module, and a primary modeling channel module.
5. An active noise control system of an air conditioner according to claim 1, wherein the FxLMS-based active noise control algorithm includes the following steps:
1) selecting the length (the filtering frequency band range) L of a filter and a convergence coefficient mu;
2) secondary channel transfer function identification;
3) filter full coefficient initialization: w (0) ═ 0;
4) iterative loop operation:
where x (n) is the initial reference noise signal, x '(n) is the filtered signal, y (n) is the filter output signal, d (n) is the filter desired signal, y' (n) is the anti-noise signal, hp(n) is the primary channel transfer function, hs(n) is the subchannel transfer function, e (n) is the error signal, W (n) is the filter weights, and W (n +1) is the filter update weights.
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Cited By (4)
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| CN112128918A (en) * | 2020-08-11 | 2020-12-25 | 清华大学苏州汽车研究院（相城） | Active noise control system for noise reduction of air conditioner fan and air conditioner |
| CN112259069A (en) * | 2020-10-21 | 2021-01-22 | 上海协格空调工程有限公司 | Dynamic active noise reduction method and air conditioning equipment |
| CN112261215A (en) * | 2020-10-12 | 2021-01-22 | 珠海格力电器股份有限公司 | Device and noise reduction method thereof |
| CN112610996A (en) * | 2020-12-30 | 2021-04-06 | 珠海格力电器股份有限公司 | Active noise reduction control method for range hood based on neural network |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112128918A (en) * | 2020-08-11 | 2020-12-25 | 清华大学苏州汽车研究院（相城） | Active noise control system for noise reduction of air conditioner fan and air conditioner |
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| CN112259069A (en) * | 2020-10-21 | 2021-01-22 | 上海协格空调工程有限公司 | Dynamic active noise reduction method and air conditioning equipment |
| CN112259069B (en) * | 2020-10-21 | 2023-03-14 | 上海协格空调工程有限公司 | Dynamic active noise reduction method and air conditioning equipment |
| CN112610996A (en) * | 2020-12-30 | 2021-04-06 | 珠海格力电器股份有限公司 | Active noise reduction control method for range hood based on neural network |
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