CN114974198A - Active noise reduction system for reducing road traffic noise - Google Patents

Active noise reduction system for reducing road traffic noise Download PDF

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Publication number
CN114974198A
CN114974198A CN202210446072.3A CN202210446072A CN114974198A CN 114974198 A CN114974198 A CN 114974198A CN 202210446072 A CN202210446072 A CN 202210446072A CN 114974198 A CN114974198 A CN 114974198A
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noise reduction
noise
active noise
active
evaluation result
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汪林兵
尹嘉存
叶周景
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University of Science and Technology Beijing USTB
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University of Science and Technology Beijing USTB
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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
    • G10K11/1781—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
    • G10K11/17815—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 reference signals and the error signals, i.e. primary 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
    • G10K11/17823—Reference signals, e.g. ambient acoustic environment
    • 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
    • G10K11/17825—Error signals
    • 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
    • G10K11/1783—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 handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions
    • G10K11/17833—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 handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions by using a self-diagnostic function or a malfunction prevention function, e.g. detecting abnormal output levels
    • 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
    • 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
    • G10K11/17861—Methods, e.g. algorithms; Devices using additional means for damping sound, e.g. using sound absorbing panels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/02—Constructional details
    • H04Q1/025—Cabinets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/02—Constructional details
    • H04Q1/03—Power distribution arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Signal Processing (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

The invention discloses an active noise reduction system for reducing road traffic noise, which comprises an outdoor equipment box, a solar power supply system, a cloud server, a client and a plurality of active noise reduction devices, wherein the outdoor equipment box is connected with the solar power supply system; the outdoor equipment box, the solar power supply system and the active noise reduction device are arranged on two sides of a road; a plurality of active noise reduction devices are arranged to form an array and used for realizing noise reduction in a designated area; a gateway is arranged in the outdoor equipment box, and a display screen is arranged on the outer side of the outdoor equipment box; the gateway is used for wirelessly transmitting the noise data to the cloud server and forming a database in the cloud server; the cloud server is also used for receiving the instruction information of the administrator, transmitting the instruction information to the gateway, and executing the instruction information by the gateway so as to control the working state of the active noise reduction system; the display screen and the client are used for displaying the noise data of each active noise reduction device and the real-time evaluation result of the active noise reduction system on the noise environment to a user. The invention can improve the current situation of serious traffic noise pollution in the street area.

Description

Active noise reduction system for reducing road traffic noise
Technical Field
The invention relates to the technical field of road and traffic engineering, in particular to an active noise reduction system for reducing road traffic noise.
Background
In recent years, the highway construction in China is rapidly developed, the highway mileage and the highway density are increased year by year, and the total highway mileage in China reaches 501.25 kilometers by 2019. Meanwhile, the quantity of automobiles in China is also rapidly increased, the road traffic system is continuously improved, the quantity of automobiles is rapidly increased, the travel and the life of people are facilitated, and the national economic development is greatly promoted. However, the problem of traffic noise pollution caused by the noise becomes increasingly serious.
The traffic noise seriously harms the physical and mental health of human beings and the environmental quality, and particularly, residents living in an area close to the street have more or less physical and mental health problems because of being in an overproof noise environment for a long time, so that the traffic noise pollution problem needs to be paid attention to all circles of society. At present, the noise reduction technology widely applied in the field of road traffic is a passive noise reduction technology, including: the method comprises the steps of building a sound insulation barrier at the roadside, planting greening vegetation, changing pavement textures, selecting porous pavement materials and the like. However, passive noise reduction techniques have some disadvantages, such as the sound barrier obstructing the view, which is not good for landscape design; the green belt occupies a large area and cannot be planned in certain areas of a city; porous asphalt pavements are weakened in structural properties compared to conventional asphalt pavements. In addition, traffic noise is mainly low-frequency noise, and the sound absorption frequency band of the passive noise reduction technology is narrow, so that the high-frequency part in the traffic noise can be effectively reduced, but the noise reduction effect on the low-frequency noise is poor.
The active noise reduction technology can make up for the deficiency, has wide action frequency band and can effectively reduce low-frequency noise, but the research and the application of the active noise reduction technology in the field of road traffic are few so far.
Disclosure of Invention
The invention provides an active noise reduction system for reducing road traffic noise, which aims to improve the current situation of serious traffic noise pollution in an adjacent street area and solve the problem of reducing the traffic noise of urban roads.
In order to solve the technical problems, the invention provides the following technical scheme:
an active noise reduction system for reducing road traffic noise comprises an outdoor equipment box, a solar power supply system, a cloud server, a client and a plurality of active noise reduction devices; wherein,
the outdoor equipment box, the solar power supply system and the active noise reduction device are arranged on the roadside of a road to be subjected to noise reduction; the active noise reduction devices are arranged to form an array and used for realizing noise reduction in a designated area; a gateway is arranged in the outdoor equipment box, and a display screen is arranged on the outer side of the outdoor equipment box; the active noise reduction device is connected with the cloud server through the gateway, and the cloud server is connected with the client; the solar power supply system is used for supplying power to the gateway, and the active noise reduction device is supplied with power by the gateway;
the gateway is used for wirelessly transmitting the noise data to the cloud server and forming a database in the cloud server; the cloud server is further used for receiving instruction information of a manager, transmitting the instruction information to the gateway, and executing the instruction information by the gateway to control the working state of the active noise reduction system;
the client is used for displaying the noise data of each active noise reduction device and the real-time evaluation result of the active noise reduction system on the noise environment to a user;
the display screen is used for displaying the real-time evaluation result of the active noise reduction system to the noise environment.
Further, the active noise reduction device comprises a reference microphone, an error microphone, a loudspeaker, a controller and a measurement microphone; wherein,
the reference microphone is used for acquiring traffic noise signals in real time, transmitting the noise signals to the controller and using the noise signals as reference signals for algorithm analysis;
the error microphone is used for acquiring a noise signal subjected to noise reduction by the loudspeaker in real time, transmitting the noise signal to the controller and using the noise signal as an error signal for algorithm analysis;
the controller is used for analyzing the noise reduction signal based on the reference signal and the error signal by adopting a filtering-X LMS algorithm, transmitting the analyzed noise reduction signal to the loudspeaker, releasing the noise reduction signal by the loudspeaker and reducing the noise;
the measuring microphone is used for measuring noise data subjected to noise reduction by the active noise reduction device and transmitting the collected noise data to the controller for analysis so as to check the working effect of the active noise reduction device in real time; the noise data collected by the measuring microphone and subjected to noise reduction by the device comprise a decibel value and spectrum data.
Further, the process of analyzing the noise reduction signal by the controller includes:
acquiring a reference signal output by the reference microphone and an error signal output by the error microphone;
calculating an output signal of the FIR filter, and driving the loudspeaker by using the output signal;
calculating a filtered signal as an input signal of the LMS algorithm using a secondary channel estimation model; and updating the weight coefficient of the adaptive filter through iteration, and repeating the iteration process until the error signal meets the set requirement, so that the system can realize the expected noise reduction effect.
Further, the display screen is also used for displaying the noise data of each active noise reduction device.
Further, the display mode of the noise data of the active noise reduction device is as follows: displaying noise data of each active noise reduction device in a table form; wherein,
the first row of the table shows the noise decibel value of the reference microphone, i.e. the initial traffic noise decibel value; the second row of the table displays the noise decibel value of the measuring microphone, namely the traffic noise decibel value after noise reduction by the active noise reduction device; the third row of the table shows the difference between the decibel values of the noise of the reference microphone and the noise of the measurement microphone, the difference is shown in positive number form, if the decibel value of the measurement microphone is less than the decibel value of the reference microphone, it means that the active noise reduction device has a noise reduction effect, at this time, the difference is shown in green, if the decibel value of the measurement microphone is greater than the decibel value of the reference microphone, it means that the active noise reduction device is exerting a negative effect, at this time, the difference is shown in red.
Further, the real-time evaluation result of the noise environment comprises average decibel values of a plurality of reference microphones, average decibel values of a plurality of measuring microphones, evaluation on the working condition of the active noise reduction device, evaluation result on the overall condition of the noise environment and preset prompt information; wherein,
the method for evaluating the working condition of the active noise reduction device comprises the following steps: evaluating the working condition of each active noise reduction device, wherein the evaluated standard is a noise decibel value; when the noise reduction value of the active noise reduction device is more than or equal to 10 decibels, the evaluation result is excellent; when the noise reduction value is more than or equal to 5 decibels, the evaluation result is good; when the noise reduction value is larger than 0 decibel, the evaluation result is general; when the device exerts the opposite action, the evaluation result is the working abnormity; when the evaluation result is abnormal work, the display is performed in a red font, otherwise, the display is performed in a green font;
the method for evaluating the overall situation of the noise environment comprises the following steps: when the noise is lower than the preset limit value by more than 10 decibels, the evaluation result is excellent; when the noise is lower than the preset limit value within 10 decibels, the evaluation result is normal; when the noise exceeds the preset limit value within 10 decibels, the evaluation result is poor; when the noise exceeds the preset limit value by more than 10 decibels, the evaluation result is very poor; when the evaluation result is excellent or normal, the evaluation result is displayed in a green font; and when the evaluation result is poor or poor, displaying in a red font and giving preset prompt information.
Further, the cloud server is specifically used for storing various data generated by the system to form a database, so that researchers can remotely analyze the data through the database to perform scientific research; the cloud server is also used for a manager to remotely check the working state of the system, and when a certain active noise reduction device works abnormally, the cloud server can remind the manager to overhaul the corresponding active noise reduction device and consider to temporarily close the device with abnormal working.
Further, the client is also used for giving out preset prompt information according to the user type when the noise exceeds the limit value.
Further, the client is also used for the user to learn skills to cope with noise.
Further, the solar power supply system comprises a solar cell module, a solar controller and a storage battery;
the solar cell module and the storage battery are both connected with the solar controller;
the solar controller and the storage battery are arranged inside the outdoor equipment box, and the solar cell module is arranged outside the outdoor equipment box and used for converting solar energy into electric energy.
The technical scheme provided by the invention has the beneficial effects that at least:
the active noise reduction system for reducing the road traffic noise can be arranged on the vertical rods and the protective guards on two sides of the urban road or on the outer sides of buildings needing noise reduction, can select a proper place to install the active noise reduction device according to the protection area, has flexible installation position and meets the actual engineering requirements. The system reduces traffic noise according to an active noise reduction principle, can reduce the traffic noise, evaluate the noise environment and the working condition of the active noise reduction system in real time, provides prompt information according to the evaluation result, provides decision management for researchers and users, is beneficial to reducing traffic noise pollution, and improves the current situation of serious traffic noise pollution in an area close to the street.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a block diagram of an active noise reduction system for road traffic noise reduction provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of a display screen interface provided by an embodiment of the invention;
FIG. 3 is a schematic diagram of a system installation provided by an embodiment of the present invention;
fig. 4 is a schematic view of an actual application scenario provided by the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The embodiment provides an active noise reduction system for road traffic noise reduction, which can be installed on the vertical rods and the protective fences on the two sides of an urban road or on the outer side of a building needing noise reduction. As shown in fig. 1, the system includes an outdoor equipment box at the front end, a solar power supply system, a plurality of active noise reduction devices, a cloud server at the back end, and an applet running on the client; the outdoor equipment box, the solar power supply system and the active noise reduction device are arranged on the roadside of the road to be subjected to noise reduction through the bracket. A gateway is arranged in the outdoor equipment box, and a display screen is arranged on the outer side of a box door of the outdoor equipment box; the active noise reduction devices are reasonably arranged to form an array according to noise characteristics and a protection space, and an optimal noise reduction effect can be achieved, wherein each active noise reduction device is integrated in a special box body, and the box body can be manufactured by a 3D printing technology and is self-defined in shape. The installation mode can meet the actual road environment and system working requirements and can be applied to actual engineering. It should be noted that the number and the positions of the active noise reduction devices are not constant, and need to be determined according to the actual situation and the requirement of the field. Specifically, the system is described in parts as follows:
1. active noise reduction device
In the system of the embodiment, a plurality of active noise reduction devices are reasonably arranged to form an array, so that the noise reduction effect can be realized in a designated area; the active noise reduction device is connected with the cloud server through a gateway; the device mainly comprises a reference microphone, an error microphone, a loudspeaker, a controller and a measuring microphone, wherein the functions of all components are as follows:
reference microphone
The system is used for collecting traffic noise signals in real time, transmitting the noise signals to the controller and using the noise signals as reference signals for algorithm analysis.
② error microphone
The noise reduction device is used for collecting noise signals subjected to noise reduction through the loudspeaker in real time, transmitting the noise signals to the controller, and using the noise signals as error signals for algorithm analysis, so that the effects of real-time inspection and noise reduction effect adjustment can be achieved.
③ loudspeaker
The controller analyzes the noise reduction signal based on the reference signal and the error signal by adopting a filtering-X LMS algorithm, transmits the analyzed noise reduction signal to the loudspeaker, and releases the noise reduction signal for reducing noise.
Controller
The controller is the core of the device, and the part utilizes a DSP development board to realize the processing of noise signals, including the processes of real-time reception, algorithm analysis, signal output and the like of the noise signals.
The algorithm adopted by the controller is a filtering-X LMS (FXLMS) algorithm, and the method specifically comprises the following steps:
the reference microphone and the error microphone respectively collect a reference input signal x (n) and an error signal e (n); computing an output signal u (n) of the FIR filter, the output signal u (n) driving a secondary sound source (loudspeaker); calculating a filtered x signal as an input signal of the LMS algorithm using a secondary channel estimation model; the weight coefficient of the adaptive filter is updated through iteration, and the iteration process is repeated until the error signal e (n) meets the set requirement, and at the moment, the system can realize the expected noise reduction effect.
Measuring microphone
The device is used for measuring noise data subjected to noise reduction by the device and transmitting the collected noise data to the controller for analysis so as to check the working effect of the active noise reduction device in real time; the noise data collected by the measuring microphone and subjected to noise reduction by the device comprises decibel values and spectrum data.
2. Solar power supply system
The solar power supply system is used for solving the power consumption problem of the active noise reduction system and comprises a solar cell module, a solar controller, a storage battery and other modules; the solar power supply system can continuously supply power for the active noise reduction system. The solar battery assembly and the storage battery are connected with the solar controller; solar control ware and battery all set up in the inside of outdoor equipment case, and solar module sets up in the outside of outdoor equipment case to be fixed in higher position, be used for converting solar energy into the electric energy.
3. Gateway
The gateway is used for receiving signals of the active noise reduction controller, wirelessly transmitting noise data to the cloud server through the 5G module, and forming a database in the cloud server. In addition, the manager can issue commands remotely, command information is transmitted to the gateway through the cloud server, and the gateway executes the commands to control the active noise reduction system.
4. Display screen
The active noise reduction system can evaluate the noise environment and the working condition of the active noise reduction device in real time, and prompt information is given according to the evaluation result for researchers and users to make decision management. The information can be visually presented to the road traffic participants through the display screen. The display screen may display two parts of content as shown in fig. 2, where a represents the average decibel value of a plurality of reference microphones; b represents an average decibel value of the plurality of measuring microphones; c represents evaluation and presentation information of the entire noise environment.
A first part: displaying the noise data of each active noise reduction device in a form of a table, wherein a first row displays a noise decibel value of a reference microphone, namely an initial traffic noise decibel value; the second line displays the noise decibel value of the measuring microphone, namely the traffic noise decibel value after noise reduction by the active noise reduction device; the third row shows the difference between the decibel values of the noise of the reference microphone and the noise of the measurement microphone, the value is shown in positive number form, if the decibel value of the measurement microphone is less than the decibel value of the reference microphone, it means that the active noise reduction device has the function of reducing the noise, and the value is shown in green, if the decibel value of the measurement microphone is greater than the decibel value of the reference microphone, it means that the active noise reduction device is playing a negative role, and the value is shown in red.
A second part: the system can evaluate the noise environment in real time, including the working condition of the active noise reduction device and the whole condition of the noise environment, and give an evaluation result and a corresponding prompt, and the content can be displayed on a screen.
The method for evaluating the working condition of the active noise reduction device comprises the following steps: the system will evaluate the operation of each active noise reduction device, the primary criterion evaluated being the decibel value of noise. When the noise reduction value of the active noise reduction device is more than or equal to 10 decibels, the evaluation result is excellent; when the noise reduction value is more than or equal to 5 decibels, the evaluation result is good; when the noise reduction value is larger than 0 decibel, the evaluation result is general; when the device exerts the opposite action, the evaluation result is a working abnormality. And when the evaluation result is abnormal work, displaying in a red font, otherwise displaying in a green font.
The evaluation method for the overall situation of the noise environment is as follows: according to the acoustic environment quality standard (GB 30962008), areas within a certain distance on two sides of a highway traffic trunk are divided into 4 a-type acoustic environment functional areas, and the noise limit values of the acoustic environment functional areas are 70dB (A) in daytime and 55dB (A) in night. When the noise is lower than the limit value by more than 10 decibels, the evaluation result is excellent; when the noise is lower than the limit value within 10 decibels, the evaluation result is normal; when the noise exceeds the limit value within 10 decibels, the evaluation result is poor; when the noise exceeds the limit value by 10 db or more, the evaluation result is poor. When the evaluation result is excellent or normal, the evaluation result is displayed in a green font; when the evaluation result is poor or poor, the red font is displayed and prompt information is given, such as reminding passers-by to reduce the stay time at the place.
It should be noted that, if the screen size is limited or a concise and clear effect is pursued, only the content of "noise environment real-time evaluation" on the right side of the screen may be displayed.
5. Cloud server
The cloud server is mainly used for storing various data generated by the system, forming a database and realizing interaction with the gateway and the mobile terminal small program. Researchers can remotely analyze data through a database to carry out scientific research; the administrator can also remotely check the working state of the system, when a certain active noise reduction device works abnormally, the cloud server can remind the administrator to overhaul the device, and the device is considered to be temporarily closed.
6. Client side applet
In most cases, it is inconvenient for a user to view related information through a display screen, so that client side applets, including PC side and mobile phone side applets, are developed. The data generated by the active noise reduction system is stored in the cloud server, the cloud server interacts with the client side small program, a user logs in the small program and can view all information on the display screen, and the difference is that prompt information given by the small program can be specific to different groups, for example, a user selects 'nearby residents' in 'user types', and when the noise exceeds a limit value, the small program prompts that the noise is large and please close a window. Further, the user can also learn a small skill on the applet to cope with the noise.
The system is flexible in installation mode and can meet the requirements of actual engineering. The operation of the present system will be further described with reference to fig. 3 and 4.
The system is installed on upright rods on two sides of a road by comprehensively considering the actual environment of an urban road section and the working requirements of an active noise reduction system. The outdoor equipment box is installed at the position where the vertical rod is higher, the solar panel of the solar power supply system is installed above the outdoor equipment box, the active noise reduction devices are installed on the support, the active noise reduction devices are reasonably arranged to form an array, a noise reduction area is generated between the system and a building, and the number and the layout of the active noise reduction devices are determined by actual environment and engineering requirements.
When the system enters a working state, the reference microphone and the error microphone respectively acquire a reference signal and an error signal and input the reference signal and the error signal into the controller, the controller calculates to obtain an output signal to drive the loudspeaker, and the measuring microphone is used for measuring noise data subjected to noise reduction. In addition, the system analyzes the collected noise data, so as to evaluate the working condition of the active noise reduction device and the noise condition of the area, the evaluation result is sent to a user and a manager through a display screen, a client applet and a cloud server, and corresponding prompt information is given according to different user types, for example: when the noise exceeds the noise limit value, if the user type is a pedestrian, prompting the pedestrian to reduce the staying time in the area, and if the user type is a nearby resident, prompting the nearby resident to close the window; when one active noise reduction device works abnormally, a manager is prompted to overhaul the device and consider temporarily shutting down the abnormal device.
In summary, the present embodiment provides an active noise reduction system for reducing road traffic noise, in consideration that most urban road sections are not suitable for installing large structures such as sound barriers, the active noise reduction system for reducing road traffic noise provided by the present embodiment may be installed on the uprights and guard rails on both sides of an urban road or on the outer side of a building where noise reduction is required, the active noise reduction system may select a suitable place to install an active noise reduction device according to a protection area, and the installation position is flexible and meets the actual engineering requirements. The system reduces traffic noise according to an active noise reduction principle, can reduce the traffic noise, evaluate the noise environment and the working condition of the active noise reduction system in real time, provides prompt information according to the evaluation result, provides decision management for researchers and users, is beneficial to reducing traffic noise pollution, and improves the current situation of serious traffic noise pollution in an area close to the street.
Further, it should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal 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 terminal apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
Finally, it should be noted that while the above describes a preferred embodiment of the invention, it will be appreciated by those skilled in the art that, once the basic inventive concepts have been learned, numerous changes and modifications may be made without departing from the principles of the invention, which shall be deemed to be within the scope of the invention. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.

Claims (10)

1. An active noise reduction system for reducing road traffic noise is characterized by comprising an outdoor equipment box, a solar power supply system, a cloud server, a client and a plurality of active noise reduction devices; wherein,
the outdoor equipment box, the solar power supply system and the active noise reduction device are arranged on the roadside of a road to be subjected to noise reduction; the active noise reduction devices are arranged to form an array and used for realizing noise reduction in a designated area; a gateway is arranged in the outdoor equipment box, and a display screen is arranged on the outer side of the outdoor equipment box; the active noise reduction device is connected with the cloud server through the gateway, and the cloud server is connected with the client; the solar power supply system is used for supplying power to the gateway, and the active noise reduction device is supplied with power by the gateway;
the gateway is used for wirelessly transmitting the noise data to the cloud server, and a database is formed in the cloud server; the cloud server is also used for receiving instruction information of a manager, transmitting the instruction information to the gateway, and executing the instruction information by the gateway so as to control the working state of the active noise reduction system;
the client is used for displaying the noise data of each active noise reduction device and the real-time evaluation result of the active noise reduction system on the noise environment to a user;
the display screen is used for displaying the real-time evaluation result of the active noise reduction system to the noise environment.
2. The active noise reduction system for road traffic noise reduction according to claim 1, wherein the active noise reduction device comprises a reference microphone, an error microphone, a speaker, a controller, and a measurement microphone; wherein,
the reference microphone is used for acquiring traffic noise signals in real time, transmitting the noise signals to the controller and using the noise signals as reference signals for algorithm analysis;
the error microphone is used for acquiring a noise signal subjected to noise reduction by the loudspeaker in real time, transmitting the noise signal to the controller and using the noise signal as an error signal for algorithm analysis;
the controller is used for analyzing a noise reduction signal based on the reference signal and the error signal by adopting a filtering-X LMS algorithm, transmitting the analyzed noise reduction signal to the loudspeaker, releasing the noise reduction signal by the loudspeaker and reducing noise;
the measuring microphone is used for measuring noise data subjected to noise reduction by the active noise reduction device and transmitting the collected noise data to the controller for analysis so as to check the working effect of the active noise reduction device in real time; the noise data collected by the measuring microphone and subjected to noise reduction by the device comprises decibel values and spectrum data.
3. The active noise reduction system for road traffic noise reduction according to claim 2, wherein the process of the controller analyzing the noise reduction signal comprises:
acquiring a reference signal output by the reference microphone and an error signal output by the error microphone;
calculating an output signal of the FIR filter, and driving the loudspeaker by using the output signal;
calculating a filtered signal as an input signal of the LMS algorithm using a secondary channel estimation model; and updating the weight coefficient of the adaptive filter through iteration, and repeating the iteration process until the error signal meets the set requirement, wherein the system can realize the expected noise reduction effect at the moment.
4. The active noise reduction system for road traffic noise reduction according to claim 3, wherein the display screen is further configured to display noise data for each active noise reduction device.
5. The active noise reduction system for road traffic noise reduction according to claim 4, wherein the noise data of the active noise reduction device is displayed in a manner of: displaying noise data of each active noise reduction device in a table form; wherein, the first row of the table displays the noise decibel value of the reference microphone, namely the initial traffic noise decibel value; the second row of the table displays the noise decibel value of the measuring microphone, namely the traffic noise decibel value after noise reduction of the active noise reduction device; the third row of the table shows the difference between the decibel values of the noise of the reference microphone and the noise of the measurement microphone, the difference is shown in positive number form, if the decibel value of the measurement microphone is less than the decibel value of the reference microphone, it means that the active noise reduction device has a noise reduction effect, at this time, the difference is shown in green, if the decibel value of the measurement microphone is greater than the decibel value of the reference microphone, it means that the active noise reduction device is exerting a negative effect, at this time, the difference is shown in red.
6. The active noise reduction system for road traffic noise reduction according to claim 5, wherein the real-time evaluation results of the noise environment comprise average decibel values of a plurality of reference microphones, average decibel values of a plurality of measurement microphones, evaluation of the working condition of the active noise reduction device, evaluation results of the overall condition of the noise environment, and preset prompt information; wherein,
the method for evaluating the working condition of the active noise reduction device comprises the following steps: evaluating the working condition of each active noise reduction device, wherein the evaluation standard is a noise decibel value; when the noise reduction value of the active noise reduction device is more than or equal to 10 decibels, the evaluation result is excellent; when the noise reduction value is more than or equal to 5 decibels, the evaluation result is good; when the noise reduction value is larger than 0 decibel, the evaluation result is general; when the device exerts the opposite action, the evaluation result is the working abnormity; when the evaluation result is abnormal work, the display is performed in a red font, otherwise, the display is performed in a green font;
the method for evaluating the overall situation of the noise environment comprises the following steps: when the noise is lower than the preset limit value by more than 10 decibels, the evaluation result is excellent; when the noise is lower than the preset limit value within 10 decibels, the evaluation result is normal; when the noise exceeds the preset limit value within 10 decibels, the evaluation result is poor; when the noise exceeds the preset limit value by more than 10 decibels, the evaluation result is very poor; when the evaluation result is excellent or normal, the evaluation result is displayed in a green font; and when the evaluation result is poor or poor, displaying in a red font and giving preset prompt information.
7. The active noise reduction system for road traffic noise reduction according to claim 1, wherein the cloud server is specifically configured to store various types of data generated by the system to form a database, so that researchers can remotely analyze the data through the database to conduct scientific research; the cloud server is further used for managers to remotely check the working state of the system, and when one active noise reduction device works abnormally, the cloud server can remind the managers to overhaul the corresponding active noise reduction device and consider to temporarily close the device working abnormally.
8. The active noise reduction system for road traffic noise reduction according to claim 1, wherein the client is further configured to give a preset prompt message according to a user type when the noise exceeds a limit value.
9. The active noise reduction system for road traffic noise reduction according to claim 8, wherein the client is further configured to learn skills to cope with noise for a user.
10. The active noise reduction system for road traffic noise abatement of claim 1, wherein the solar powered system comprises a solar cell assembly, a solar controller, and a battery;
the solar cell module and the storage battery are both connected with the solar controller;
the solar controller and the storage battery are arranged inside the outdoor equipment box, and the solar cell module is arranged outside the outdoor equipment box and used for converting solar energy into electric energy.
CN202210446072.3A 2022-04-26 2022-04-26 Active noise reduction system for reducing road traffic noise Pending CN114974198A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115881077A (en) * 2022-11-28 2023-03-31 广州声博士声学技术有限公司 Space active noise reduction system and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115881077A (en) * 2022-11-28 2023-03-31 广州声博士声学技术有限公司 Space active noise reduction system and method

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