CN109448692B - Electrical equipment noise reduction system based on electrical signal processing - Google Patents
Electrical equipment noise reduction system based on electrical signal processing Download PDFInfo
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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
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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
- G10K11/17821—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
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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
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- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention relates to a noise reduction technology for electric equipment, in particular to an electric equipment noise reduction system based on electric signal processing. The invention has the advantages that: the noise reduction processing is directly carried out aiming at electromagnetic noise with the largest influence, so that the structure composition of noise reduction is simplified, the occupied space requirement for noise reduction is reduced, the on-site noise reduction processing system is of an open-loop structure, the precision is high, the reliability is good, and the noise reduction effect is good.
Description
Technical Field
The invention relates to a noise reduction technology for power equipment, in particular to a power equipment noise reduction system based on electric signal processing.
Background
The noise of the power equipment is the sum of electromagnetic noise, mechanical noise and air noise caused by the irregularity, intermittence, continuity or random generated by the power equipment in the process of body structural design, selected layout, installation and use, and the power equipment running in the urban area needs to be subjected to noise reduction treatment according to the environmental protection requirement. In the prior art, noise reduction modes of power equipment comprise sound insulation, sound absorption and other technical means, and along with popularization of active noise reduction technology, the existing power equipment mostly adopts an active noise reduction device to achieve the purpose of noise reduction.
The existing active noise reduction process comprises the following steps: the installation site collects primary noise, then the primary noise is analyzed, calculated and processed through the site control unit to generate a control signal, and secondary noise is emitted through the loudspeaker to counteract most of the primary noise, so that active noise reduction is realized. The active noise reduction device generally comprises a microphone, a loudspeaker, a control unit, an amplifying and collecting auxiliary module and the like; the control unit comprises a data receiving, data analyzing and self-adapting algorithm module, the sound signal input by the microphone is input into the data acquisition card through the preamplifier, and then enters the control unit for data real-time processing (refer to Chinese patent 201510358696 and 201520954520). The technical scheme has the following defects:
first, since the input is an audio signal, a large number of microphones, and components such as a detection and an amplifier, which are matched with each other, are required to be disposed on site, and the connection process between the components is performed, so that the occupation of land and the cost are increased, the installation operation is complicated, and the debugging and the maintenance are inconvenient.
Second, because microphones are on-site receiving noise signals, they are susceptible to various disturbances, sometimes requiring the addition of an ambient noise detector to filter out ambient sound; in addition, the input value is an analog quantity, the input value needs to be converted into a digital quantity and then signal processing is carried out, output delay is caused, and the situation of packet loss of an analog signal sometimes occurs, so that effect distortion is caused.
Finally, as the analysis and calculation of the data are concentrated in a control unit installed on the site, the real-time processing is needed through feedback closed-loop control, the processing precision and reliability are greatly reduced, and the noise reduction effect is difficult to achieve the expected effect.
Disclosure of Invention
The invention aims to provide the electric equipment noise reduction system based on the electric signal processing, which has the advantages of simple installation, convenient operation and maintenance, no occupation of land, no interference from the external environment and good noise reduction effect.
The aim of the invention is achieved by the following ways:
the power equipment noise reduction system based on the electric signal processing is characterized by comprising the following components:
1) The data acquisition system of the factory test site comprises a sound sensor, a control host and a data storage device, wherein the control host comprises an electric signal receiving module, a comparison judging module, a self-adaptive algorithm module, a control processing module and a data output module which are sequentially connected, the output end of the sound sensor is connected with the comparison judging module through an amplifying conversion module, and the output end of the electric signal receiving module connected with the power equipment background monitoring system is connected with the control processing module; the data output module is connected with the data storage device;
dividing the power equipment into N sections A1 and A2 … AN according to the condition from empty load to full load, wherein N is more than 2, starting and controlling the power equipment to operate in the section A1, collecting noise signals generated by the power equipment at the moment by a sound sensor, sending the noise signals to a comparison and judgment module, judging whether the noise signals exceed a set threshold value by the comparison and judgment module, and sending the noise signals to AN adaptive algorithm module if the noise signals exceed the threshold value;
the self-adaptive algorithm module analyzes and calculates according to the received noise signals, obtains noise reduction sound wave data for canceling the corresponding noise signals, and sends the noise reduction sound wave data to the control processing module; the control processing module establishes association between the current running electric signal data of the electric power equipment obtained from the background monitoring system through the electric signal receiving module and the noise reduction sound wave data obtained by calculation of the self-adaptive algorithm module to form noise reduction association data, and the noise reduction association data is stored in the data storage device; further sequentially adjusting the power equipment to operate in the A2 … AN interval, so as to obtain the associated data of the electric signal data and the noise reduction sound wave data of each interval, and finishing data acquisition;
2) The noise reduction and verification system of the factory test site provides a sound sensor and a data storage device in the data acquisition system, and also comprises a data processor and a loudspeaker, wherein a data receiving end of the data processor is respectively connected with the sound sensor, the data storage device and a background monitoring system of corresponding electric equipment, and a driving output end of the data processor is connected with the loudspeaker;
starting and controlling the power equipment to run in an A1 section, comparing the electric signal data transmitted by the background monitoring system with noise reduction associated data in the data storage device one by the data processor to obtain corresponding noise reduction sound wave data, transmitting the noise reduction sound wave data to a loudspeaker through a driving output end by the data processor, and transmitting noise reduction sound waves by the loudspeaker;
after the sound sensor starts to send out noise reduction at the loudspeaker, collecting sound data and sending the sound data to the data processor, wherein the data processor judges whether the collected sound data is larger than a set noise reduction value, if so, the data processor judges that the collected sound data is unqualified, and records related data including noise reduction related data and sound data with actual noise reduction; if the collected sound data is smaller than the noise reduction value, the data processor judges that the sound data is qualified, then the power equipment is further sequentially adjusted to operate in AN A2 … AN interval, and unqualified related data of each time are recorded;
sending unqualified related data to a control host of a data acquisition system for re-data acquisition, and then checking through a noise reduction checking system until all intervals can obtain qualified noise reduction related data;
3) The noise reduction processing system of the power equipment operation site comprises a noise reduction loudspeaker, a data comparison module and a data storage unit, wherein the receiving end of the data comparison module is connected with the power equipment background monitoring system, and qualified noise reduction associated data obtained through a data acquisition system and a noise reduction verification system are stored in the data storage unit; the driving output end of the data comparison module is connected with the noise reduction loudspeaker;
the data comparison module receives electric signal data corresponding to real-time operation of the electric equipment through the background monitoring system, searches noise reduction associated data of a corresponding section through the electric signal data in the data storage unit, obtains noise reduction sound wave data in the noise reduction associated data of the section, and then sends the noise reduction sound wave to the noise reduction loudspeaker through the driving output end, and the noise reduction loudspeaker sends noise reduction sound waves to complete a noise reduction process.
The noise of the power equipment comprises electromagnetic noise, mechanical noise and air noise, wherein most of the air noise and the mechanical noise are high-frequency noise, the propagation distance is relatively short, and the influence is small; the electromagnetic noise is low-frequency noise, has longer wavelength and long propagation distance, is not easy to absorb even if the propagation distance is reduced along with the attenuation of the distance, and is easy to cause noise pollution to the surrounding area. Electromagnetic noise generated by exciting periodic magnetostrictive vibrations by alternating electromagnetic fields is therefore the largest source of noise. The invention is designed on the basis of the scheme, and the noise of the power equipment is considered to be directly related to the operation condition, such as low noise level when no-load or low operation power is adopted, high noise level when full-load operation is adopted, and the noise is less influenced by external conditions, so that the noise of the power equipment can be considered to be the same under the same operation condition (the same frequency, voltage and load).
In this way, the noise generated by the power equipment is subjected to organic analysis to obtain the electromagnetic noise as the most influenced noise source, and then the noise reduction scheme with high pertinence is provided according to the characteristics of the electromagnetic noise, wherein the noise is stable and influenced by the running load: and acquiring and obtaining associated noise reduction sound wave data according to the electric signal of the operation of the electric equipment as a reference, and then carrying out noise reduction processing according to the obtained noise reduction associated data. Because of the operation characteristics of the power equipment, the data acquisition and verification can be performed in a factory test stage, a large number of field work flows and debugging flows are saved, the field operation efficiency is improved, the reliability of the data is good, and the influence and the interference of the operation environment of the power equipment are avoided; secondly, because the data acquisition is not required to be completed on site, a large number of sound sensors, control hosts for calculation and analysis, data auxiliary equipment and feedback facilities and installation can be omitted in site installation, the occupied space requirement is reduced, the installation is greatly simplified, and the operation and maintenance are convenient; finally, because the on-site noise reduction system is of an open-loop structure, no feedback signal is needed, the on-site noise reduction system is not interfered by the external environment, has high precision and good reliability, can directly perform noise reduction treatment on electromagnetic noise with the largest influence, and has good noise reduction effect.
The invention may further be embodied as:
the data storage unit comprises a card reader and a chip card, wherein the chip card can be inserted into the card reader, and the chip card stores electric signal data and noise reduction sound wave data which are associated in a one-to-one correspondence manner.
Therefore, the noise reduction associated data obtained by the power equipment in the factory test operation stage can be stored in the form of a chip, then the same chip card can be used according to the power equipment corresponding to the same model specification, and the power equipment can be used only by inserting the corresponding chip card during installation, so that the operation is simple, complex debugging is not needed, the on-site debugging time is greatly shortened, and the maintenance is convenient and simple. The card reader can be installed in the same housing as the data comparison module or the same collector circuit board design.
In addition, it is also possible to:
and the data storage unit is provided with a reading storage interface. Thus, the noise reduction associated data obtained at the factory can be written into the field data storage unit through the field handheld PDA or the portable PC, and the noise reduction associated data is convenient and quick.
In summary, the invention provides a noise reduction system of electric equipment based on electric signal processing, which comprises a data acquisition system and a noise reduction verification system in a factory test stage and a noise reduction processing system of an electric equipment operation site, wherein the factory stage acquires and verifies noise reduction associated data of which the electric signal is a reference comparison signal when the electric equipment operates, and then writes the verified associated data into a data storage unit in the noise reduction processing system of the operation site, and triggers a corresponding data driving loudspeaker to carry out noise elimination by taking the electric signal as the reference through a data comparison device. The invention has the advantages that: a large number of field work flows and debugging flows are saved, the field operation efficiency is improved, the reliability of data is good, a large number of sound sensors, control hosts for calculation and analysis, data auxiliary equipment and feedback facilities and installation can be omitted in field installation, the occupied space requirement is reduced, the installation is greatly simplified, and the operation and maintenance are convenient; the device is not interfered by the external environment, and has high precision, good reliability and good noise reduction effect.
Drawings
Fig. 1 is a schematic diagram of a system structure of a data acquisition system and a noise reduction verification system in a noise reduction system of an electric power device based on electric signal processing.
Fig. 2 is a schematic system structure diagram of a field noise reduction processing system in the noise reduction system of the electric equipment based on the electric signal processing.
Fig. 3 is a schematic diagram of a flow structure of signal acquisition in the noise reduction system of the electrical equipment based on the electrical signal processing.
Fig. 4 is a schematic diagram of a system structure of a noise reduction site in the noise reduction system of the electrical equipment based on the electrical signal processing.
The invention is further described below with reference to examples.
Detailed Description
Best mode for carrying out the invention:
referring to fig. 1, the electrical equipment noise reduction system based on electrical signal processing comprises the following components:
1) Referring to fig. 1, a data acquisition system of a factory test site comprises a sound sensor, a control host and a data storage device, wherein the control host comprises an electric signal receiving module, a comparison judging module, a self-adaptive algorithm module, a control processing module and a data output module which are sequentially connected, the output end of the sound sensor is connected with the comparison judging module through an amplifying conversion module, and the output end of the electric signal receiving module connected with a power equipment background monitoring system is connected with the control processing module; the data output module is connected with the data storage device; the electrical signals include, but are not limited to, frequency, voltage, load condition data.
Referring to fig. 3, the power equipment is divided into N sections A1 and A2 … AN according to the condition from empty load to full load, N >2, for example, the main transformer can set operation condition group sections under the conditions of 50HZ full load-50 HZ half load, 50HZ half load-50 HZ30% load, 50HZ30% load-empty load and the like, and the current transformer can set operation condition group sections under the conditions of currents 0-500A,500-1000A and the like, which are respectively defined as sections A1, A2 and A3.
And starting and controlling the power equipment to run in the A1 interval, collecting noise signals generated by the power equipment at the moment by using the sound sensor, sending the noise signals to the comparison and judgment module, judging whether the noise signals exceed a set threshold value by the comparison and judgment module, and sending the noise signals to the self-adaptive algorithm module if the noise signals exceed the threshold value.
The self-adaptive algorithm module analyzes and calculates according to the received noise signals, obtains noise reduction sound wave data for canceling the corresponding noise signals, and sends the noise reduction sound wave data to the control processing module; the control processing module establishes associated data through the electric signal data of the current operation of the electric power equipment obtained by the electric signal receiving module from the background monitoring system and the noise reduction acoustic wave data obtained by calculation of the self-adaptive algorithm module, and stores the associated data into the data storage device; and further sequentially adjusting the power equipment to operate in the A2 … AN interval, so as to obtain noise reduction associated data of each interval including the electric signal data and the noise reduction sound wave data, and finishing data acquisition.
2) Referring to fig. 1 and 3, the noise reduction and verification system in the factory test site provides a sound sensor and a data storage device in a data acquisition system, and further comprises a data processor and a loudspeaker, wherein a data receiving end of the data processor is respectively connected with the sound sensor, the data storage device and a background monitoring system of corresponding electric equipment, and a driving output end of the data processor is connected with the loudspeaker; the data processor may be a device or process integrated in the control host.
And starting and controlling the power equipment to run in the A1 section, performing one-to-one comparison between the data processor and noise reduction associated data in the data storage device according to the electric signal data transmitted by the background monitoring system to obtain corresponding noise reduction sound wave data, and transmitting the noise reduction sound wave data to a loudspeaker through a driving output end after A/D conversion by the data processor, wherein the loudspeaker transmits noise reduction sound waves.
After the sound sensor starts to send out noise reduction at the loudspeaker, collecting sound data and sending the sound data to the data processor, wherein the data processor judges whether the collected sound data is larger than a set noise reduction value, if so, the data processor judges that the collected sound data is unqualified, and records related data including noise reduction related data and sound data with actual noise reduction; if the collected sound data is smaller than the noise reduction value, the data processor judges that the sound data is qualified, then the power equipment is further adjusted to operate in the A2 … AN interval in sequence, and unqualified noise reduction associated data of each time are recorded.
And sending the unqualified related data to a control host of the data acquisition system for re-data acquisition, and then checking through the noise reduction checking system until all intervals can obtain the qualified noise reduction related data.
3) Referring to fig. 2, the noise reduction processing system of the power equipment operation site comprises a noise reduction loudspeaker, a data comparison module and a data storage unit, wherein a receiving end of the data comparison module is connected with a power equipment background monitoring system, and qualified noise reduction associated data obtained through a data acquisition system and a noise reduction verification system is stored in the data storage unit; the driving output end of the data comparison module is connected with the noise reduction loudspeaker. The data storage unit comprises a card reader and a chip card, wherein the chip card can be inserted into the card reader, and noise reduction associated data are stored in the chip card.
Referring to fig. 4, the data comparison module receives the electric signal data corresponding to the real-time operation of the electric power equipment through the background monitoring system, searches the noise reduction associated data of the corresponding section through the electric signal data in the data storage unit, obtains the noise reduction sound wave data in the section associated data, sends the noise reduction sound wave to the noise reduction loudspeaker through the driving output end, and sends the noise reduction sound wave through the noise reduction loudspeaker to complete the noise reduction process.
Compared with the prior art, the invention has the following technical advantages:
1. the noise reduction input source is an electric signal, and the control host can drive the loudspeaker to send out corresponding cancellation waves through the electric signal, so that the purpose of noise reduction is achieved.
2. The data acquisition and verification stage is realized in a factory, so that the field debugging time is reduced.
3. The noise reduction working stage has no feedback signal, is open loop control, simplifies the whole system and increases the reliability.
4. In the noise reduction working stage, a microphone, a self-adaptive algorithm module and the like are not needed, and the occupied area and the cost of equipment are reduced.
5. The signal input and output are connected with the background monitoring system, the active noise reduction system is brought into the category of intelligent power equipment, and the intelligent degree of the equipment is improved.
The invention is not described in part as in the prior art.
Claims (4)
1. The electric equipment noise reduction system based on the electric signal processing is characterized by comprising the following components:
1) The data acquisition system of the factory test site comprises a sound sensor, a control host and a data storage device, wherein the control host comprises an electric signal receiving module, a comparison judging module, a self-adaptive algorithm module, a control processing module and a data output module which are sequentially connected, the output end of the sound sensor is connected with the comparison judging module through an amplifying conversion module, and the output end of the electric signal receiving module connected with the power equipment background monitoring system is connected with the control processing module; the data output module is connected with the data storage device;
dividing the power equipment into N sections A1 and A2 … AN according to the condition from empty load to full load, wherein N is more than 2, starting and controlling the power equipment to operate in the section A1, collecting noise signals generated by the power equipment at the moment by a sound sensor, sending the noise signals to a comparison and judgment module, judging whether the noise signals exceed a set threshold value by the comparison and judgment module, and sending the noise signals to AN adaptive algorithm module if the noise signals exceed the threshold value;
the self-adaptive algorithm module analyzes and calculates according to the received noise signals, obtains noise reduction sound wave data for canceling the corresponding noise signals, and sends the noise reduction sound wave data to the control processing module; the control processing module establishes association between the current running electric signal data of the electric power equipment obtained from the background monitoring system through the electric signal receiving module and the noise reduction sound wave data obtained by calculation of the self-adaptive algorithm module to form noise reduction association data, and the noise reduction association data is stored in the data storage device; further sequentially adjusting the power equipment to operate in the A2 … AN interval, so as to obtain the associated data of the electric signal data and the noise reduction sound wave data of each interval, and finishing data acquisition;
2) The noise reduction and verification system of the factory test site provides a sound sensor and a data storage device in the data acquisition system, and also comprises a data processor and a loudspeaker, wherein a data receiving end of the data processor is respectively connected with the sound sensor, the data storage device and a background monitoring system of corresponding electric equipment, and a driving output end of the data processor is connected with the loudspeaker;
starting and controlling the power equipment to run in an A1 section, comparing the electric signal data transmitted by the background monitoring system with noise reduction associated data in the data storage device one by the data processor to obtain corresponding noise reduction sound wave data, transmitting the noise reduction sound wave data to a loudspeaker through a driving output end by the data processor, and transmitting noise reduction sound waves by the loudspeaker;
after the sound sensor starts to send out noise reduction at the loudspeaker, collecting sound data and sending the sound data to the data processor, wherein the data processor judges whether the collected sound data is larger than a set noise reduction value, if so, the data processor judges that the collected sound data is unqualified, and records related data including noise reduction related data and sound data with actual noise reduction; if the collected sound data is smaller than the noise reduction value, the data processor judges that the sound data is qualified, then the power equipment is further sequentially adjusted to operate in AN A2 … AN interval, and unqualified related data of each time are recorded;
sending unqualified related data to a control host of a data acquisition system for re-data acquisition, and then checking through a noise reduction checking system until all intervals can obtain qualified noise reduction related data;
3) The noise reduction processing system of the power equipment operation site comprises a noise reduction loudspeaker, a data comparison module and a data storage unit, wherein the receiving end of the data comparison module is connected with the power equipment background monitoring system, and qualified noise reduction associated data obtained through a data acquisition system and a noise reduction verification system are stored in the data storage unit; the driving output end of the data comparison module is connected with the noise reduction loudspeaker;
the data comparison module receives electric signal data corresponding to real-time operation of the electric equipment through the background monitoring system, searches noise reduction associated data of a corresponding section through the electric signal data in the data storage unit, obtains noise reduction sound wave data in the noise reduction associated data of the section, and then sends the noise reduction sound wave to the noise reduction loudspeaker through the driving output end, and the noise reduction loudspeaker sends noise reduction sound waves to complete a noise reduction process.
2. The electrical device noise reduction system based on electrical signal processing according to claim 1, wherein the data storage unit comprises a card reader and a chip card, the chip card being insertable into the card reader, and the chip card storing noise reduction associated data therein.
3. The electrical device noise reduction system based on electrical signal processing of claim 2, wherein the card reader is either mounted in the same housing as the data comparison module or the same collector circuit board design.
4. The electrical equipment noise reduction system based on electrical signal processing according to claim 1, wherein the data storage unit is provided with a read storage interface, and noise reduction associated data obtained at the factory can be written into the data storage unit on site by a hand-held PDA or a portable PC on site.
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