CN113539226B - Active noise reduction control method for transformer substation - Google Patents
Active noise reduction control method for transformer substation 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
- 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
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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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- 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
- G10K11/17857—Geometric disposition, e.g. placement of microphones
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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
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/111—Directivity control or beam pattern
Abstract
The invention provides a transformer substation active noise reduction control method, which belongs to the technical field of noise suppression and comprises the steps of recording noise after azimuth adjustment and generating noise information, carrying out phase processing on a low-intermediate frequency region in the noise information to obtain low-intermediate frequency information, and generating low-intermediate frequency noise reduction according to the low-intermediate frequency information by a first loudspeaker; carrying out phase processing on a high-frequency region in the noise information to obtain high-frequency information, and sending out high-frequency noise reduction by a second loudspeaker according to the high-frequency information; the method comprises the steps of recording environmental sounds in a transformer substation, generating environmental information, and respectively coupling the environmental information with high-frequency information and low-intermediate-frequency information after phase processing for adjusting low-intermediate-frequency noise reduction and high-frequency noise reduction. According to the active noise reduction control method for the transformer substation, the low-medium frequency and the high frequency are processed separately, so that the noise suppression effect is improved, and meanwhile, the noise decibel value in the whole transformer substation is finally reduced by detecting the environmental sound again.
Description
Technical Field
The invention belongs to the technical field of noise suppression, and particularly relates to an active noise reduction control method for a transformer substation.
Background
In recent years, with rapid development of power grid construction and increasing expansion of urban scale, compared with 110kV and 220kV substations, a 500kV substation has the characteristics of more types of noise sources, higher noise source intensity and more complex noise influence, which also results in more obvious influence on the environment outside the substation.
In the prior art, a plurality of active noise reduction systems exist, the systems can collect noise through a feedforward microphone, a feedback microphone and the like and generate noise reduction sounds with opposite phases, however, when the transformer substation is used daily, most of the noise is concentrated in a high-frequency area, the influence of the high-frequency area on human ears is most obvious and is not easily inhibited, and in addition, because a plurality of electrical devices are arranged in the transformer substation, the decibel value in the transformer substation cannot be effectively reduced by the existing active noise reduction systems.
Disclosure of Invention
The invention aims to provide an active noise reduction control method for a transformer substation, and aims to solve the problem that decibel values in the transformer substation cannot be effectively reduced.
In order to achieve the purpose, the invention adopts the technical scheme that: the active noise reduction control method for the transformer substation comprises the following steps:
arranging a plurality of silencing units in the transformer substation, wherein each silencing unit comprises a plurality of first loudspeakers and second loudspeakers which correspond to each other one by one, and a tracker on each silencing unit detects noise and adjusts the first loudspeakers and the second loudspeakers to the positions where the noise is emitted;
after the azimuth is adjusted, recording the noise and generating noise information, carrying out phase processing on a low-intermediate frequency region in the noise information to obtain low-intermediate frequency information, and generating low-intermediate frequency drop noise by the first loudspeaker according to the low-intermediate frequency information; carrying out phase processing on a high-frequency region in the noise information to obtain high-frequency information, and sending out high-frequency noise reduction by the second loudspeaker according to the high-frequency information; recording environmental sounds in the transformer substation, generating environmental information, and respectively coupling the environmental information with the high-frequency information and the low-intermediate-frequency information after phase processing is performed on the environmental information so as to adjust the low-intermediate-frequency noise reduction and the high-frequency noise reduction.
As another embodiment of the present application, the recording the environmental sounds in the substation and generating the environmental information includes:
and when the decibel value in the transformer substation is higher than a preset standard, starting a checking microphone, and recording the environmental sound by the checking microphone.
As another embodiment of the present application, the coupling the environment information with the high frequency information and the low intermediate frequency information after the phase processing is performed on the environment information, respectively, for adjusting the low intermediate frequency drop noise and the high frequency drop noise includes:
extracting a high frequency part and a low intermediate frequency part in the environment information through a filter;
performing phase processing on the high-frequency part and coupling with the high-frequency information; the low intermediate frequency portion is phase processed and coupled with the low intermediate frequency information.
As another embodiment of the present application, the high frequency part is phase-processed and coupled with the high frequency information; phase processing the low-if portion and coupling with the low-if information includes:
performing a spectrum transformation on the high frequency information, the low intermediate frequency information, the high frequency part and the low intermediate frequency part, respectively;
and superposing the frequency spectrum corresponding to the high-frequency part into the frequency spectrum corresponding to the high-frequency information, and superposing the frequency spectrum corresponding to the low-intermediate frequency part into the frequency spectrum corresponding to the low-intermediate frequency information.
As another embodiment of the present application, the superimposing the spectrum corresponding to the high frequency portion into the spectrum corresponding to the high frequency information, and the superimposing the spectrum corresponding to the low intermediate frequency portion into the spectrum corresponding to the low intermediate frequency information includes:
respectively determining a high-frequency spectrogram, a low-intermediate frequency spectrogram, a high-frequency spectrum check chart and a low-intermediate frequency spectrum check chart corresponding to the high-frequency information, the low-intermediate frequency information, the high-frequency part and the low-intermediate frequency part;
adding a frequency interval in the high-frequency spectrum check chart, which is different from the high-frequency spectrum chart, and a value corresponding to the interval into the high-frequency spectrum chart; and adding a frequency interval in the low-intermediate frequency spectrum check chart, which is different from the low-intermediate frequency spectrum chart, and a value corresponding to the interval into the low-intermediate frequency spectrum chart.
As another embodiment of the present application, after adding a frequency interval of the low-if spectrum check map different from the low-if spectrum map and a value corresponding to the interval to the low-if spectrum map, the method further includes:
and adjusting values in the same frequency interval in the high-frequency spectrogram according to the high-frequency spectrum check chart, and adjusting values in the same frequency interval in the low-intermediate frequency spectrogram according to the low-intermediate frequency spectrum check chart.
As another embodiment of the present application, after the adjusting values in the same frequency interval in the low-if spectrogram according to the low-if spectrogram check chart, the method further includes:
restoring the checked high-frequency spectrogram and the checked low-intermediate frequency spectrogram into sound wave information, and respectively generating sound by the second loudspeaker and the first loudspeaker;
and the check microphone detects the decibel value in the transformer substation again.
As another embodiment of the present application, the detecting noise by a tracker on the sound reduction unit and adjusting the first speaker and the second speaker to the orientation from which the noise is emitted includes:
determining, by the tracker, a location of the noise while adjusting the first speaker and the second speaker horizontally and vertically such that both the first speaker and the second speaker are oriented toward the orientation of the noise.
As another embodiment of the present application, before a plurality of silencing units are provided in the substation, the method further includes:
and a reflecting plate is arranged along the circumferential direction of the outer edge of the transformer substation and used for reflecting the noise upwards.
As another embodiment of the present application, after the disposing the reflection plate along the circumferential direction of the outer edge of the substation, the method further includes:
the inner side surface of the reflecting plate is provided with silencing cotton, and the top of the reflecting plate is provided with a silencing plate.
The active noise reduction control method for the transformer substation, provided by the invention, has the beneficial effects that: compared with the prior art, the transformer substation active noise reduction control method has the advantages that the plurality of silencing units are arranged in the transformer substation, and the tracker can adjust the first loudspeaker and the second loudspeaker in the silencing units to the noise direction, so that the problem that noise cannot be effectively eliminated due to the fact that angle deviation exists between the tracker and a noise source is solved, and the noise suppression effect is guaranteed.
After the azimuth adjustment is finished, the noise is recorded and the noise information is generated, in the application, the high-frequency region and the low-intermediate frequency region in the noise information are subjected to phase processing respectively, so that the high-frequency information and the low-intermediate frequency information are obtained, the high-frequency information sends out high-frequency noise reduction through the second loudspeaker, and the low-intermediate frequency information sends out low-intermediate frequency noise reduction through the first loudspeaker.
After the preliminary noise reduction is completed, the environmental sound in the transformer substation is recorded and environmental information is generated, the environmental information is subjected to phase processing and is respectively coupled with the high-frequency information and the low-intermediate frequency information, so that the low-intermediate frequency noise reduction and the high-frequency noise reduction are adjusted, and the noise suppression effect is further improved. Thereby through separating low intermediate frequency and high frequency and handling the effect that has improved noise suppression in this application, detect once more to environmental sound simultaneously and finally reduced the decibel value of noise in the whole transformer substation.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the prior art descriptions will be briefly described 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 that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a transformer substation active noise reduction control method according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a method for controlling active noise reduction of a substation according to the present invention will now be described. A transformer substation active noise reduction control method comprises the following steps:
a plurality of silencing units are arranged in the transformer substation, each silencing unit comprises a plurality of first loudspeakers and a plurality of second loudspeakers which correspond to one another one by one, and the trackers on the silencing units detect noise and adjust the first loudspeakers and the second loudspeakers to the positions where the noise is emitted.
Recording noise and generating noise information after azimuth adjustment, carrying out phase processing on a low-intermediate frequency region in the noise information to obtain low-intermediate frequency information, and generating low-intermediate frequency drop noise by a first loudspeaker according to the low-intermediate frequency information; carrying out phase processing on a high-frequency region in the noise information to obtain high-frequency information, and sending out high-frequency noise reduction by a second loudspeaker according to the high-frequency information; the method comprises the steps of recording environmental sounds in a transformer substation, generating environmental information, and respectively coupling the environmental information with high-frequency information and low-intermediate-frequency information after phase processing for adjusting low-intermediate-frequency noise reduction and high-frequency noise reduction.
The active noise reduction control method for the transformer substation, provided by the invention, has the beneficial effects that: compared with the prior art, the transformer substation active noise reduction control method has the advantages that the plurality of silencing units are arranged in the transformer substation, and the tracker can adjust the first loudspeaker and the second loudspeaker in the silencing units to the noise direction, so that the problem that noise cannot be effectively eliminated due to the fact that angle deviation exists between the tracker and a noise source is solved, and the noise suppression effect is guaranteed.
After the azimuth adjustment is finished, the noise is recorded and the noise information is generated, in the application, the high-frequency region and the low-intermediate frequency region in the noise information are subjected to phase processing respectively, so that the high-frequency information and the low-intermediate frequency information are obtained, the high-frequency information sends out high-frequency noise reduction through the second loudspeaker, and the low-intermediate frequency information sends out low-intermediate frequency noise reduction through the first loudspeaker.
After the preliminary noise reduction is completed, the environmental sound in the transformer substation is recorded and environmental information is generated, the environmental information is subjected to phase processing and is respectively coupled with the high-frequency information and the low-intermediate frequency information, so that the low-intermediate frequency noise reduction and the high-frequency noise reduction are adjusted, and the noise suppression effect is further improved. Thereby through separating low intermediate frequency and high frequency and handling the effect that has improved noise suppression in this application, detect once more to environmental sound simultaneously and finally reduced the decibel value of noise in the whole transformer substation.
According to actual observation, the noise in the transformer substation is not greatly changed at low frequency and medium frequency, but has certain randomness at high frequency, and the existing active noise reduction technology mostly sends out low frequency, medium frequency and high frequency simultaneously through one noise reduction horn.
The existing active noise reduction technology is used for inhibiting external environment noise in a sub-band mode, namely, the noise reduction effect of different frequencies is different. If the suppression of noise is concentrated on the low-frequency and intermediate-frequency parts, high-frequency noise is mainly introduced into human ears from the aspect of hearing, and the actual noise reduction effect is not greatly different no matter which noise reduction method is adopted, and additional noise is introduced instead to cause discomfort of human ears.
As a specific implementation of the active noise reduction control method for the substation provided by the present invention, recording the environmental sound in the substation and generating the environmental information includes:
and when the decibel value in the transformer substation is higher than the preset standard, starting the checking microphone, and recording the environmental sound by the checking microphone.
When the decibel value in the substation is higher than the preset standard, it is indicated that the noise reduction sound emitted by the first loudspeaker and the second loudspeaker does not suppress the noise to a reasonable level, and therefore, a checking microphone needs to be started, the checking microphone can record sound, and the high-frequency noise reduction sound and the low-medium-frequency noise reduction sound are properly adjusted by adopting a similar method.
As a specific implementation manner of the active noise reduction control method for the substation provided by the present invention, the step of respectively coupling the environmental information with the high frequency information and the low intermediate frequency information after performing phase processing on the environmental information for adjusting the low intermediate frequency noise reduction and the high frequency noise reduction includes:
the high frequency part and the low intermediate frequency part in the environment information are extracted through a filter.
Performing phase processing on the high-frequency part and coupling with high-frequency information; the low intermediate frequency portion is phase processed and coupled with the low intermediate frequency information.
The low intermediate frequency and the high frequency exist in the environment sound, the data generated by the checking microphone are respectively transmitted to the two filters, one filter is used for filtering the low intermediate frequency, the other filter is used for filtering the high frequency, then phase processing and coupling are carried out, and therefore the sound emitted by the first loudspeaker and the sound emitted by the second loudspeaker are finally adjusted, and the noise suppression effect is further improved.
As a specific implementation of the active noise reduction control method for the transformer substation provided by the invention, the high-frequency part is subjected to phase processing and coupled with high-frequency information; the phase processing and coupling of the low intermediate frequency portion with the low intermediate frequency information includes:
the high frequency information, the low intermediate frequency information, the high frequency part and the low intermediate frequency part are subjected to spectral conversion, respectively.
And superposing the frequency spectrum corresponding to the high-frequency part into the frequency spectrum corresponding to the high-frequency information, and superposing the frequency spectrum corresponding to the low-intermediate frequency part into the frequency spectrum corresponding to the low-intermediate frequency information.
Through frequency spectrum conversion, the difference between the two can be compared more conveniently, and therefore high-frequency information and low-intermediate frequency information can be adjusted more specifically.
Fourier transforms may be used in this application.
As a specific implementation of the active noise reduction control method for the substation provided by the present invention, the step of superimposing a frequency spectrum corresponding to the high-frequency portion into a frequency spectrum corresponding to the high-frequency information, and the step of superimposing a frequency spectrum corresponding to the low-intermediate frequency portion into a frequency spectrum corresponding to the low-intermediate frequency information includes:
and respectively determining a high-frequency spectrogram, a low-intermediate frequency spectrogram, a high-frequency spectrum check chart and a low-intermediate frequency spectrum check chart corresponding to the high-frequency information, the low-intermediate frequency information, the high-frequency part and the low-intermediate frequency part.
Adding a frequency interval in the high-frequency spectrum check chart, which is different from the high-frequency spectrum chart, and a value corresponding to the interval into the high-frequency spectrum chart; and adding a frequency interval in the low-intermediate frequency spectrum check chart, which is different from the low-intermediate frequency spectrum chart, and a value corresponding to the interval into the low-intermediate frequency spectrum chart.
The high-frequency spectrum check chart and the low-intermediate frequency spectrum check chart inevitably have frequency intervals which are not included in the high-frequency spectrum chart and the low-intermediate frequency spectrum check chart, and the intervals are redundant noise information which is not eliminated by the first loudspeaker and the second loudspeaker, so that a part of frequencies and values corresponding to the frequencies need to be added, and the noise suppression effect is improved.
As a specific embodiment of the active noise reduction control method for a substation provided by the present invention, after adding a frequency interval in a low-intermediate frequency spectrum check chart, which is different from a low-intermediate frequency spectrum chart, and a value corresponding to the interval to the low-intermediate frequency spectrum chart, the method further includes:
and adjusting the values in the same frequency interval in the high-frequency spectrogram according to the high-frequency spectrum check chart, and adjusting the values in the same frequency interval in the low-intermediate spectrogram according to the low-intermediate spectrogram.
The high frequency spectrum check graph and the high frequency spectrum graph may have a problem of different values at the same position of the frequency, so that the corresponding frequency value in the high frequency spectrum graph needs to be adjusted by taking the high frequency spectrum check graph as a reference, so as to realize the adjustment of the final high frequency noise reduction and the adjustment of the low and medium frequency noise reduction.
As a specific implementation manner of the active noise reduction control method for the substation provided by the present invention, after adjusting values in the same frequency interval in the low-intermediate frequency spectrogram according to the low-intermediate frequency spectrogram, the method further includes:
restoring the checked high-frequency spectrogram and the checked low-intermediate frequency spectrogram into sound wave information, and respectively sounding by a second loudspeaker and a first loudspeaker;
and the check microphone detects the decibel value in the transformer substation again.
The checking microphone is always in an operating state, and the main purpose of the checking microphone is to check the final result. It should be noted that the initial microphone used when the noise is recorded for the first time is not always in an operating state, but is in an off state after the noise is accurately detected, and the generated high-frequency information and low-mid-frequency information are stored and corresponding noise reduction sounds are emitted by the first speaker and the second speaker. When the decibel value acquired by the check microphone is higher than the preset standard and still cannot meet the preset standard after the high-frequency drop noise and the low-medium frequency drop noise are adjusted, the initial microphone is started again, and therefore the high-frequency information and the low-medium frequency information which are stored before are replaced.
As a specific embodiment of the transformer substation active noise reduction control method provided by the present invention, detecting noise by a tracker on a silencing unit and adjusting a first speaker and a second speaker to a direction from which the noise is emitted includes:
the position of the noise is determined by the tracker while adjusting the horizontal and vertical angles of the first and second speakers so that both the first and second speakers are oriented towards the direction of the noise.
Be provided with a plurality of electrical equipment in the transformer substation, in the practical application process, certain electrical equipment can be closed and certain electrical equipment can be opened, because the position relatively fixed of amortization unit, but the emergence source of noise can change constantly, in order to all have the effect of suppression to the noise that different positions sent, need adjust the space angle of first speaker and second speaker in this application.
In order to facilitate understanding, the first loudspeaker and the second loudspeaker are connected to the supporting plate through the ball heads, the first motor is arranged along the outer edge of the supporting plate and used for driving the supporting plate to swing in the horizontal direction, the electric push rod is connected between the supporting plate and the first loudspeaker and between the supporting plate and the second loudspeaker and used for adjusting the swing of the first loudspeaker and the swing of the second loudspeaker on the vertical plane, and the angle of the first loudspeaker and the angle of the second loudspeaker can be adjusted in the space range through the design.
It is particularly noted that a controller is arranged between the tracker and the first motor and the electric putter, and the controller is used for accurately adjusting the space angle of the first loudspeaker and the second loudspeaker by controlling the time when the first motor and the electric putter are switched on according to the electric signal provided by the tracker.
As a specific implementation manner of the active noise reduction control method for the substation provided by the present invention, before the setting of a plurality of noise reduction units in the substation, the method further includes:
and a reflecting plate is arranged along the circumferential direction of the outer edge of the transformer station and is used for reflecting noise upwards.
Can install a plurality of electrical equipment in the transformer substation, every electrical equipment all can produce the noise in the operation of reality, because the power relatively remain stable when the transformer substation moves, consequently the noise that its produced also is relatively stable in certain time, the accessible is recorded or is recorded the audio frequency that has been stored in this application, and broadcast through first speaker and second speaker can, consequently need not to gather noise information to a certain extent, can reduce the decibel value of noise in the transformer substation to a certain extent.
Because the electrical equipment in the transformer substation can send the noise to all around when actual operation, the noise in the transformer substation is suppressed by a plurality of amortization units, and the bounding wall slope of reflecting plate from the transformer substation sets up downwards, so when the noise outwards propagates and meets the reflecting plate, the effect through the reflecting plate can make the noise transmit to the top of transformer substation to the influence to the surrounding environment has been avoided to a certain extent.
In the prior art, the reflecting plate cannot reflect 100% of noise, so that part of the noise is diffused to the surrounding air through the reflecting plate, the outer side surface of the reflecting plate is used for reflecting the noise, the inner side surface of the reflecting plate is provided with silencing cotton, and the noise transmission is inhibited through the silencing cotton.
Since the height of the substation enclosure is generally limited and the electrical equipment usually emits noise radially outward, a sound absorbing plate is attached to the top of the reflecting plate in order to further enhance the noise suppression effect. In practice, the acoustical panels may be bolted to the enclosure at the top of the substation enclosure.
As a specific implementation manner of the active noise reduction control method for the substation provided by the present invention, after the reflection plate is arranged along the circumferential direction of the outer edge of the substation, the method further includes:
the inner side surface of the reflecting plate is provided with silencing cotton, and the top of the reflecting plate is provided with a silencing plate.
Particularly, active noise reduction systems on the market are mostly applied to the field of acoustics such as earphones, a feedforward microphone and a feedback microphone are usually arranged, information acquired by the two microphones is used for determining phase information with opposite phases, and the purpose of reducing noise is achieved through positive and negative cancellation. It is to be noted, however, that the noise generated by the relatively fixed frequency and form of the noise in the substation does not vary much.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A transformer substation active noise reduction control method is characterized by comprising the following steps:
arranging a plurality of silencing units in the transformer substation, wherein each silencing unit comprises a plurality of first loudspeakers and second loudspeakers which correspond to each other one by one, and a tracker on each silencing unit detects noise and adjusts the first loudspeakers and the second loudspeakers to the positions where the noise is emitted;
after the azimuth is adjusted, recording the noise and generating noise information, carrying out phase processing on a low-intermediate frequency region in the noise information to obtain low-intermediate frequency information, and generating low-intermediate frequency drop noise by the first loudspeaker according to the low-intermediate frequency information; carrying out phase processing on a high-frequency region in the noise information to obtain high-frequency information, and sending out high-frequency noise reduction by the second loudspeaker according to the high-frequency information; recording environmental sounds in the transformer substation and generating environmental information, and respectively coupling the environmental information with the high-frequency information and the low-intermediate-frequency information after phase processing is carried out on the environmental information for adjusting the low-intermediate-frequency noise reduction and the high-frequency noise reduction;
the recording the environmental sounds in the substation and generating the environmental information comprises:
when the decibel value in the transformer substation is higher than a preset standard, starting a check microphone, and recording the environmental sound by the check microphone;
the step of respectively coupling the environment information with the high-frequency information and the low-intermediate-frequency information after performing phase processing on the environment information for adjusting the low-intermediate-frequency drop noise and the high-frequency drop noise comprises:
extracting a high frequency part and a low intermediate frequency part in the environment information through a filter;
performing phase processing on the high-frequency part and coupling with the high-frequency information; performing phase processing on the low-intermediate frequency part and coupling with the low-intermediate frequency information;
the high-frequency part is subjected to phase processing and coupled with the high-frequency information; phase processing the low intermediate frequency portion and coupling with the low intermediate frequency information comprises:
performing a spectrum transformation on the high frequency information, the low intermediate frequency information, the high frequency part and the low intermediate frequency part, respectively;
superposing the frequency spectrum corresponding to the high-frequency part into the frequency spectrum corresponding to the high-frequency information, and superposing the frequency spectrum corresponding to the low-intermediate-frequency part into the frequency spectrum corresponding to the low-intermediate-frequency information;
the superimposing the frequency spectrum corresponding to the high frequency part into the frequency spectrum corresponding to the high frequency information, and the superimposing the frequency spectrum corresponding to the low-intermediate frequency part into the frequency spectrum corresponding to the low-intermediate frequency information includes:
respectively determining a high-frequency spectrogram, a low-intermediate frequency spectrogram, a high-frequency spectrum check chart and a low-intermediate frequency spectrum check chart corresponding to the high-frequency information, the low-intermediate frequency information, the high-frequency part and the low-intermediate frequency part;
adding a frequency interval in the high-frequency spectrum check chart, which is different from the high-frequency spectrum chart, and a value corresponding to the interval into the high-frequency spectrum chart; and adding a frequency interval in the low-intermediate frequency spectrum check chart, which is different from the low-intermediate frequency spectrum chart, and a value corresponding to the interval into the low-intermediate frequency spectrum chart.
2. The active noise reduction control method for the substation according to claim 1, wherein after the adding a frequency interval in the low-if frequency spectrum check map different from the low-if frequency spectrum check map and a value corresponding to the interval to the low-if frequency spectrum check map further includes:
and adjusting values in the same frequency interval in the high-frequency spectrogram according to the high-frequency spectrum check chart, and adjusting values in the same frequency interval in the low-intermediate frequency spectrogram according to the low-intermediate frequency spectrum check chart.
3. The active noise reduction control method for the substation according to claim 2, wherein after the adjusting the values in the same frequency interval in the low-if spectrogram according to the low-if spectrogram, the method further comprises:
restoring the checked high-frequency spectrogram and the checked low-medium frequency spectrogram into sound wave information and enabling the sound wave information to be sounded by the second loudspeaker and the first loudspeaker respectively;
and the check microphone detects the decibel value in the transformer substation again.
4. The substation active noise reduction control method of claim 1, wherein the detecting noise by a tracker on the sound reduction unit and adjusting the first speaker and the second speaker to the orientation from which the noise emanates comprises:
determining, by the tracker, a location of the noise while adjusting the first speaker and the second speaker horizontally and vertically such that both the first speaker and the second speaker are oriented toward the orientation of the noise.
5. The active noise reduction control method for the substation according to claim 1, wherein before the step of arranging a plurality of noise reduction units in the substation, the method further comprises:
and a reflecting plate is arranged along the circumferential direction of the outer edge of the transformer substation and used for reflecting the noise upwards.
6. The active substation noise reduction control method according to claim 5, further comprising, after the disposing of the reflection plate along the circumferential direction of the substation outer edge:
the inner side surface of the reflecting plate is provided with silencing cotton, and the top of the reflecting plate is provided with a silencing plate.
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