CN112050931A - System and method for detecting environmental noise emission of transformer substation boundary - Google Patents
System and method for detecting environmental noise emission of transformer substation boundary Download PDFInfo
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Abstract
The application discloses a system and a method for detecting the environmental noise emission of a transformer substation factory boundary, wherein a vibration probe is arranged on a noise generating device to acquire a vibration signal of the device, a noise probe is arranged at a factory boundary measuring point to acquire a noise signal, and a data processing module is used for calculating the sound pressure level contribution value of the vibration signal to the noise signal according to the vibration signal and the noise signal acquired at the same time, namely acquiring the noise emission value of the factory boundary measuring point, so that the interference of background noise can be effectively inhibited, and the noise emission detection error is reduced.
Description
Technical Field
The application relates to the technical field of noise emission detection, in particular to a system and a method for detecting environmental noise emission in a transformer substation factory.
Background
With the development of economy and society, a large number of transformer substations go deep into residential areas, and noise generated during operation often has important influence on surrounding residents. According to the twenty-first regulation of the noise pollution prevention and treatment law of the people's republic of China, the emission of industrial noise to the surrounding living environment in urban areas should meet the national regulation of the environmental noise emission standards of the industrial enterprise factory.
And in the current stage, the detection and evaluation of the environmental noise of the factory boundaries of the industrial enterprises in China are mainly realized by firstly detecting the comprehensive A sound level of the environment of the factory boundaries of the industrial enterprises, then detecting the background sound pressure level of the response position, and finally subtracting the background sound pressure level from the comprehensive A sound level to obtain the factory boundary environmental noise emission value of the measuring point. Therefore, measuring the comprehensive value of the noise of the substation equipment in the factory boundary and the background sound is an important basis for judging whether the noise of the substation equipment exceeds the standard or not.
However, in actual detection, the substation equipment is continuously operated, background noise is greatly influenced by the surrounding environment, the surrounding environment noise of the substation is complex, and besides the substation noise, noises such as traffic noise, industrial noise, social environment noise, life noise and the like frequently occur and frequently change, so that the background sound detected on site is insufficient in representativeness. Therefore, the detection method at the present stage has a large error.
Disclosure of Invention
The application provides a system and a method for detecting environmental noise emission in a transformer substation factory boundary, which are used for solving the technical problem that the existing noise emission detection error is large.
In view of the above, a first aspect of the present application provides a transformer substation environment noise emission detection system, including: the system comprises an acquisition probe module, a data acquisition instrument and a data processing module;
the acquisition probe module comprises a vibration probe and a noise probe;
the vibration probe is arranged on the pre-acquired noise-generating equipment body and is used for acquiring a vibration signal of the pre-acquired noise-generating equipment body;
the noise probe is arranged at a preset plant boundary measuring point and is used for acquiring a noise signal of the preset plant boundary measuring point within preset time;
the data acquisition instrument is used for acquiring the vibration signal and the noise signal which are respectively acquired by the vibration probe and the noise probe;
the data processing module is used for receiving the vibration signal and the noise signal acquired by the data acquisition instrument at the same time, and calculating a sound pressure level contribution value of the vibration signal to the noise signal according to the vibration signal and the noise signal, so as to acquire a noise emission value of the preset plant boundary measuring point.
Preferably, the device further comprises a GPS positioning module, wherein the GPS positioning module is electrically connected with the data acquisition instrument and used for positioning the vibration probe and the noise probe and time synchronization of signal acquisition of the vibration probe and the noise probe.
Preferably, the vibration probe comprises a vibration probe A and a vibration probe B;
the vibration probe A is arranged on the noise generating equipment body A and is used for acquiring a vibration signal G of the noise generating equipment body A;
the vibration probe B is arranged on the noise generating equipment body B and is used for acquiring a vibration signal K of the noise generating equipment body B;
the data processing module is further configured to obtain a corresponding vibration acceleration frequency spectrum G (f) and a corresponding vibration acceleration frequency spectrum K (f) according to the vibration signal G and the vibration signal K in the same time, calculate a cross correlation value of the vibration signal G and the vibration signal K according to a corresponding vibration frequency phase and amplitude in the vibration acceleration frequency spectrum G (f) and the vibration acceleration frequency spectrum K (f), and determine that the noise generating device body a and the noise generating device body B are the same type of noise generating device when the cross correlation value is greater than or equal to 0.98; and when the cross correlation value is less than 0.98, judging that the noise generating equipment body A and the noise generating equipment body B are different types of noise generating equipment.
Preferably, the number of the vibration probes is a plurality of the vibration probes which are respectively and correspondingly arranged on the pre-acquired noise-generating equipment bodies, and the number of the noise probes is a plurality of the noise probes which are respectively and correspondingly arranged on the preset plant boundary measuring points;
the pre-acquired noise generating equipment bodies are different types of noise generating equipment, and the preset plant boundary measuring points are not overlapped.
Preferably, the vibration calibrator and the noise calibrator are further included, and the vibration calibrator is electrically connected with the vibration probe and is used for calibrating the vibration probe; the noise calibrator is electrically connected with the noise probe and is used for calibrating the noise probe.
On the other hand, the application also provides a method for detecting the environmental noise emission of the transformer substation factory boundary, and the system for detecting the environmental noise emission of the transformer substation factory boundary, which is applied, comprises the following steps:
s101: acquiring a vibration signal of a noise-generating equipment body acquired in advance through a vibration probe, and acquiring a noise signal of a preset plant boundary measuring point within preset time through the noise probe;
s102: acquiring the vibration signal and the noise signal respectively acquired by the vibration probe and the noise probe through a data acquisition instrument;
s103: and receiving the vibration signal and the noise signal acquired by the data acquisition instrument at the same time through a data processing module, and calculating a sound pressure level contribution value of the vibration signal to the noise signal according to the vibration signal and the noise signal so as to obtain a noise emission value of the preset plant boundary measuring point.
Preferably, the step S101 includes, before: and positioning the vibration probe and the noise probe through a GPS positioning module, and performing time synchronization on the vibration probe and the noise probe.
Preferably, the step S101 specifically includes:
s1011: acquiring a vibration signal G of a noise generating equipment body A through a vibration probe A, and acquiring a vibration signal K of a noise generating equipment body B through a vibration probe B;
s1012: after the data processing module acquires a corresponding vibration acceleration frequency spectrum G (f) and a corresponding vibration acceleration frequency spectrum K (f) according to the vibration signal G and the vibration signal K in the same time, calculating a cross correlation value of the vibration signal G and the vibration signal K according to a corresponding vibration frequency phase and amplitude in the vibration acceleration frequency spectrum G (f) and the vibration acceleration frequency spectrum K (f), and when the cross correlation value is not less than 0.98, judging that the noise generating equipment body A and the noise generating equipment body B are the same type of noise generating equipment; when the cross correlation value is less than 0.98, judging that the noise generating equipment body A and the noise generating equipment body B are different types of noise generating equipment;
s1013: the vibration probes are used for correspondingly acquiring vibration signals of a plurality of different noise-generating equipment bodies respectively, and meanwhile, the noise probes are used for correspondingly acquiring noise signals of a plurality of non-coincident preset plant boundary measuring points respectively.
Preferably, the step S101 further includes, before: the vibration probe is calibrated through a vibration calibrator, and the noise probe is calibrated through a noise calibrator.
Preferably, the step S103 specifically includes:
s1031: after the vibration signal and the noise signal acquired by the data acquisition instrument at the same time are received by a data processing module, filtering the vibration signal and the noise signal;
s1032: acquiring a vibration acceleration value and a vibration acceleration frequency in a corresponding data segment from a vibration signal data segment intercepted in advance, and acquiring a corresponding noise frequency through the noise signal, wherein the absolute time of the vibration signal data segment intercepted in advance is the same as that of the noise signal;
s1033: calculating the self-power spectrum of a noise signal according to the noise frequency, and calculating the self-power spectrum of a vibration signal according to the vibration acceleration value and the vibration acceleration frequency;
s1034: and calculating the sound pressure level contribution value of the vibration signal to the noise signal according to the self-power spectrum of the noise signal and the self-power spectrum of the vibration signal, thereby obtaining the noise emission value of the preset plant boundary measuring point.
According to the technical scheme, the embodiment of the application has the following advantages:
according to the system and the method for detecting the environmental noise emission of the transformer substation factory boundary, the vibration probe is arranged on the noise generating device to acquire the vibration signal of the device, the noise probe is arranged at the factory boundary measuring point to acquire the noise signal, and the data processing module is used for calculating the sound pressure level contribution value of the vibration signal to the noise signal according to the vibration signal and the noise signal acquired at the same time, namely acquiring the noise emission value of the factory boundary measuring point, so that the interference of background noise can be effectively inhibited, and the noise emission detection error is reduced.
Drawings
Fig. 1 is a schematic structural diagram of an environmental noise emission detection system for a substation factory boundary according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an environmental noise emission detection system for a substation factory boundary according to another embodiment of the present application;
fig. 3 is a flowchart of a method for detecting environmental noise emission of a substation boundary according to an embodiment of the present application;
fig. 4 is a flowchart of a method for detecting environmental noise emission of a substation factory boundary according to another embodiment of the present application;
fig. 5 is an environmental positioning diagram of a 110kV substation site provided in example 1 of the present application;
FIG. 6 is a cross-power spectrum of vibration signal # 1 provided in example 1 of the present application;
FIG. 7 is a cross-power spectrum of vibration signal # 2 provided in example 1 of the present application;
FIG. 8 is a self-power spectrum plot of the noise signal at plant boundary point # 3 provided in example 1 of the present application;
FIG. 9 is a graph of the contribution ratio of the noise signal at plant boundary point # 3 provided in example 1 of the present application;
FIG. 10 is a self-power spectrum plot of the noise signal at plant boundary point # 4 provided in example 1 of the present application;
FIG. 11 is a graph of the contribution ratio of the noise signal at site # 4 provided in example 1 of the present application;
FIG. 12 is a self-power spectrum plot of the noise signal at plant boundary point # 5 provided in example 1 of the present application;
FIG. 13 is a graph of the contribution ratio of the noise signal at site # 5 provided in example 1 of the present application;
fig. 14 is a 500kV substation site environment positioning diagram provided in example 2 of the present application;
FIG. 15 is a self-power spectrum plot of the noise signal at plant boundary point # 3 provided in example 2 of the present application;
FIG. 16 is a graph of the contribution ratio of the noise signal at plant boundary point # 3 provided in example 2 of the present application;
FIG. 17 is a self-power spectrum plot of the noise signal at plant boundary point # 4 as provided in example 2 of the present application;
FIG. 18 is a graph of the contribution ratio of the noise signal at site # 4 provided in example 2 of the present application;
FIG. 19 is a self-power spectrum plot of the noise signal at plant boundary point # 5 provided in example 2 of the present application;
fig. 20 is a contribution ratio spectrum of a noise signal at a plant boundary point # 5 provided in example 2 of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For easy understanding, please refer to fig. 1, the present application provides a system for detecting environmental noise emission of a substation factory boundary, including: the system comprises an acquisition probe module, a data acquisition instrument 3 and a data processing module 4;
the acquisition probe module comprises a vibration probe 1 and a noise probe 2;
the vibration probe 1 is arranged on a pre-acquired noise-generating equipment body and is used for acquiring a pre-acquired vibration signal of the noise-generating equipment body;
the noise probe 2 is arranged at a preset plant boundary measuring point and is used for collecting a noise signal of the preset plant boundary measuring point within preset time;
the data acquisition instrument 3 is used for acquiring vibration signals and noise signals respectively acquired by the vibration probe 1 and the noise probe 2;
and the data processing module 4 is used for receiving the vibration signal and the noise signal acquired by the data acquisition instrument 3 at the same time, and calculating a sound pressure level contribution value of the vibration signal to the noise signal according to the vibration signal and the noise signal, so as to obtain a preset noise emission value of the plant boundary measuring point.
In the embodiment, the vibration probe 1 is arranged on the noise generating equipment to acquire the vibration signal of the noise generating equipment, the noise probe 2 is arranged at a plant boundary point to acquire the noise signal, and the data processing module 4 calculates the sound pressure level contribution value of the vibration signal to the noise signal according to the vibration signal and the noise signal acquired at the same time, namely, the noise emission value of the plant boundary point is acquired, so that the interference of background noise can be effectively inhibited, and the noise emission detection error is reduced.
The above is one embodiment of the system for detecting environmental noise emission in substation environments provided by the present application, and the following is another embodiment of the system for detecting environmental noise emission in substation environments provided by the present application.
For ease of understanding, referring to fig. 2, the present application provides a system for detecting environmental noise emission in a substation environment, comprising: the system comprises an acquisition probe module, a data acquisition instrument 3, a data processing module 4 and a GPS positioning module 5;
the acquisition probe module comprises a vibration probe 1 and a noise probe 2;
the vibration probe 1 is arranged on a pre-acquired noise-generating equipment body and is used for acquiring a pre-acquired vibration signal of the noise-generating equipment body;
in the present embodiment, the covering frequency of the vibration probe 1 is 20 to 20000Hz, and the sensitivity is 0.5 to 3mV/ms-2Simultaneously, vibration probe 1 is one-way probe, and accessible magnetic force or glutinous viscidity material are installed on producing the surface plane of making an uproar equipment body, and in addition, the equipment body of making an uproar that obtains in advance can confirm according to the equipment parameter of transformer substation, can confirm the sound source distribution in the transformer substation promptly earlier stage to install vibration probe 1 on the sound source.
The noise probe 2 is arranged at a preset plant boundary measuring point and is used for collecting a noise signal of the preset plant boundary measuring point within preset time;
it should be noted that, in this embodiment, the covering frequency of the noise probe 2 is 20 to 20000Hz, the sensitivity is greater than 40mv/pa, the preset plant boundary measuring point can be measured through the influence range of the test noise generating device, and the preset plant boundary measuring point is within the influence range.
The GPS positioning module 5 is electrically connected with the data acquisition instrument 3 and is used for positioning the vibration probe 1 and the noise probe 2 and carrying out time synchronization on signal acquisition of the vibration probe 1 and the noise probe 2;
it should be noted that the GPS positioning module 5 may obtain a corresponding time signal from a GPS satellite, and transmit the time signal to the data processing module 4, so as to perform time synchronization on the signal acquisition of the vibration probe 1 and the noise probe 2, so as to conveniently analyze the correlation between two sets of acquired signals at the same time.
The data acquisition instrument 3 is used for acquiring vibration signals and noise signals respectively acquired by the vibration probe 1 and the noise probe 2;
in this embodiment, the data acquisition instrument is a multi-channel data acquisition instrument; meanwhile, the data acquisition instrument comprises a memory for storing the vibration signal and the noise signal.
And the data processing module 4 is used for receiving the vibration signal and the noise signal acquired by the data acquisition instrument 3 at the same time, and calculating a sound pressure level contribution value of the vibration signal to the noise signal according to the vibration signal and the noise signal, so as to obtain a preset noise emission value of the plant boundary measuring point.
Further, the vibration probe 1 comprises a vibration probe A and a vibration probe B;
the vibration probe A is arranged on the noise generating equipment body A and is used for acquiring a vibration signal G of the noise generating equipment body A;
the vibration probe B is arranged on the noise generating equipment body B and is used for acquiring a vibration signal K of the noise generating equipment body B;
the data processing module 4 is further configured to obtain a corresponding vibration acceleration frequency spectrum G (f) and a corresponding vibration acceleration frequency spectrum K (f) according to the vibration signal G and the vibration signal K in the same time, calculate a cross correlation value between the vibration signal G and the vibration signal K according to a corresponding vibration frequency phase and amplitude in the vibration acceleration frequency spectrum G (f) and the vibration acceleration frequency spectrum K (f), and determine that the noise generating device body a and the noise generating device body B are the same type of noise generating device when the cross correlation value is greater than or equal to 0.98; and when the cross correlation value is less than 0.98, judging that the noise generating equipment body A and the noise generating equipment body B are different types of noise generating equipment.
It should be noted that, the cross-correlation value of the vibration signal G and the vibration signal K is calculated as follows:
1) filtering the vibration signal G and the vibration signal K, and acquiring a vibration acceleration value G (t) and a vibration acceleration value K (t) within the vibration acceleration frequency range of 0-20 kHz after filtering;
2) calculating corresponding frequency spectrum data G (F) and K (F) according to the vibration acceleration value G (t) and the vibration acceleration value K (t) based on the F frequency response function;
3) calculating the self-power spectrum S of the vibration signal G and the vibration signal K respectively through formula 1 and formula 2GG(f)、SKK(f)，
SGG(f)＝G*(f) G (f) formula 1
SKK(f)＝K*(f) K (f) equation 2
Meanwhile, calculating the cross-power spectrum S of the vibration signal G and the vibration signal K through a formula 3 and a formula 4 respectivelyGK(f)、SKG(f)，
SGK(f)＝G*(f)·K(f) Equation 3
SKG(f)＝K*(f) G (f) formula 4
4) From the self-power spectrum S of the vibration signal G and the vibration signal KGG(f)、SKK(f) The phase and amplitude change in unit time, the cross-correlation rate gamma of the vibration signal G and the vibration signal K is calculated by equation 5,
wherein S isK，GGAs is obtained by the equation 6, the,
it should be noted that, when the noise generating device a and the noise generating device B are determined as the same type of noise generating device, the vibration probe of the noise generating device a only needs to be installed in any one of the noise generating devices in the actual testing process. In addition, the embodiment is also suitable for judging a plurality of noise-generating devices, so that the detection efficiency is improved, and the detection cost is reduced.
Further, after the noise generation type is judged, in the actual detection process, a plurality of vibration probes 1 are respectively and correspondingly arranged on a plurality of pre-acquired noise generation equipment bodies, a plurality of noise probes 2 are respectively and correspondingly arranged on a plurality of preset plant boundary measuring points;
the noise generating equipment bodies obtained in advance are different types of noise generating equipment, and the preset plant boundary measuring points are not overlapped.
Further, the system also comprises a vibration calibrator and a noise calibrator, wherein the vibration calibrator is electrically connected with the vibration probe 1 and is used for calibrating the vibration probe 1; the noise calibrator is electrically connected with the noise probe 2 and is used for calibrating the noise probe 2.
It will be appreciated that the accuracy of the detection can be improved by calibrating the vibrating probe to the noise probe 2.
The above is another embodiment of the system for detecting environmental noise emission in substation environment provided by the present application, and the following is an embodiment of a method for detecting environmental noise emission in substation environment provided by the present application.
For convenience of understanding, please refer to fig. 3, the present application provides a method for detecting environmental noise emission of substation environment, to which the system for detecting environmental noise emission of substation environment in the above embodiment is applied, including the following steps:
s101: acquiring a vibration signal of a noise-generating equipment body acquired in advance through a vibration probe, and acquiring a noise signal of a preset plant boundary measuring point within preset time through the noise probe;
s102: acquiring a vibration signal and a noise signal respectively acquired by a vibration probe and a noise probe through a data acquisition instrument;
s103: and receiving the vibration signal and the noise signal acquired by the data acquisition instrument at the same time through the data processing module, and calculating the sound pressure level contribution value of the vibration signal to the noise signal according to the vibration signal and the noise signal so as to obtain the preset noise emission value of the plant boundary measuring point.
For convenience of understanding, please refer to fig. 4, the present application provides a method for detecting environmental noise emission of substation environment, to which the system for detecting environmental noise emission of substation environment in the above embodiment is applied, including the following steps:
s1011: acquiring a vibration signal G of a noise generating equipment body A through a vibration probe A, and acquiring a vibration signal K of a noise generating equipment body B through a vibration probe B;
s1012: after the data processing module acquires a corresponding vibration acceleration frequency spectrum G (f) and a corresponding vibration acceleration frequency spectrum K (f) according to the vibration signal G and the vibration signal K in the same time, calculating a cross correlation value of the vibration signal G and the vibration signal K according to a corresponding vibration frequency phase and amplitude in the vibration acceleration frequency spectrum G (f) and the vibration acceleration frequency spectrum K (f), and when the cross correlation value is larger than or equal to 0.98, judging that the noise production equipment body A and the noise production equipment body B are the same type of noise production equipment; when the cross correlation value is less than 0.98, judging that the noise generating equipment body A and the noise generating equipment body B are different types of noise generating equipment;
s1013: correspondingly acquiring vibration signals of a plurality of different noise-generating equipment bodies through a plurality of vibration probes respectively, and correspondingly acquiring noise signals of a plurality of non-coincident preset plant boundary measuring points through a plurality of noise probes respectively;
in the present embodiment, the equipment type of the substation is x1、x2……xmThen are respectively at x1、x2……xmThe equipment body is provided with vibration probes, and noise signals at the measuring points of the factory boundary are acquired by the noise probes with corresponding quantity according to the sequence corresponding to the vibration probes, and are respectively expressed as y1、y2……yN。
S102: acquiring a vibration signal and a noise signal respectively acquired by a vibration probe and a noise probe through a data acquisition instrument;
s1031: after receiving vibration signals and noise signals acquired by the data acquisition instrument at the same time through the data processing module, filtering the vibration signals and the noise signals;
s1032: acquiring a vibration acceleration value and a vibration acceleration frequency in a corresponding data segment from a vibration signal data segment intercepted in advance, and acquiring a corresponding noise frequency through a noise signal, wherein the absolute time of the vibration signal data segment intercepted in advance is the same as the absolute time of the noise signal;
in the present embodiment, the vibration acceleration value is represented by xi(t) the vibration acceleration frequency is represented by xi(f) Noise sound pressure level is denoted y1(t), the noise frequency is represented as y1(f)。
S1033: calculating the self-power spectrum of the noise signal according to the noise frequency, and calculating the self-power spectrum of the vibration signal according to the vibration acceleration value and the vibration acceleration frequency;
in this embodiment, the process of calculating the self-power spectrum of the noise signal is as follows:
the self-power spectrum of the noise signal is calculated according to equation 7:
S1/yy(f)＝y1 *(f)·y1(f) equation 7
In this embodiment, the process of calculating the self-power spectrum of the vibration signal is as follows:
the self-power spectrum of the vibration signal is calculated according to equation 8, where "+" and "T" represent the conjugate and transpose, respectively:
s1034: and calculating the sound pressure level contribution value of the vibration signal to the noise signal according to the self-power spectrum of the noise signal and the self-power spectrum of the vibration signal, thereby obtaining the preset noise emission value of the plant boundary measuring point.
Note that, in the present embodiment, the sound pressure level contribution value L of the vibration signal to the noise signal is calculated by equation 9P/y1The calculation process of (2) is as follows:
wherein S is calculated by equation 10X1,YYThe calculation process of (2) is as follows:
repeating the steps S1011 to S1034 to obtain the noise emission value L of each plant boundary measuring pointP/y1、LP/y2……LP/ym。
Further, step S101 is preceded by: the vibration probe and the noise probe are positioned through the GPS positioning module, and time synchronization is carried out on the vibration probe and the noise probe.
Further, step S101 is preceded by: the vibration probe is calibrated through the vibration calibrator, and the noise probe is calibrated through the noise calibrator.
In this embodiment, before step S101, the method further includes calibrating the GPS positioning module, and the calibration process includes acquiring a vibration frequency and a noise frequency corresponding to the vibration signal and the noise signal acquired by the vibration probe and the noise probe at the same time, respectively, and calculating a correlation rate between the vibration frequency and the noise frequency, where the correlation rate is calculated by formula 11:
wherein R is the correlation rate, A2As the frequency of the noise, A1Is the vibration frequency and T is the acquisition time.
When the correlation rate R is larger than or equal to 0.98, the GPS positioning module is usable, otherwise, other GPS positioning modules need to be replaced.
The following describes a method for detecting environmental noise emission in a substation factory boundary provided by the present application by taking some examples.
Example 1
In this example, the environmental noise of the 110kV substation boundary is taken as a scene, please refer to fig. 5, which is an environmental map of the 110kV substation site, wherein two 110kV transformers are arranged in the substation and are main noise sources of the substation; the field environment includes road noise, social environment noise, and the like, in addition to the transformer noise.
When the noise emission detection method provided by the application is used for noise detection, as shown in fig. 5, the vibration probe 1 and the vibration probe 2 are respectively installed on a transformer # 1 and a transformer # 2, plant boundary measuring points are #3, #4 and #5 respectively, and the plant boundary measuring points are arranged at 1m outside the substation boundary of the transformer substation and are higher than the enclosure of the substation boundary by 0.5 m.
By testing that the noise of the two transformers is stable noise, the noise signal and the vibration signal of 1min are detected at this time.
After the detection is finished, respectively acquiring a vibration signal # 1 and a vibration signal # 2 of a transformer # 1 and a transformer # 2, respectively calculating self-power spectrums S11(f) and S22(f) of the vibration signal # 1 and the vibration signal # 2 and cross-power spectrums of the vibration signal # 1 and the vibration signal # 2, respectively representing the cross-power spectrums of the vibration signal # 1 and the vibration signal # 2 by images as shown in FIGS. 6 and 7, and calculating a cross-correlation value r of the vibration signal # 1 and the vibration signal # 2 to be 0.99, so that the two vibration signals are the same type of sound source.
Mounting a vibration probe on any one of a transformer # 1 and a transformer # 2, respectively arranging noise probes at plant boundary measuring points # 3, #4 and #5, collecting vibration signals, noise signals #3, #4 and #5, respectively calculating a self-power spectrum corresponding to the noise signals #3, #4 and #5 and a contribution rate spectrum of the vibration signals to the noise signals, as shown in fig. 8-9, it can be seen from the graphs that the A weighted equivalent sound pressure level of the noise signal # 3 is 56.6dBA, and the noise contribution value of the transformer station to the plant boundary measuring point # 3 is 40.3dBA respectively; as shown in fig. 10 to 11, it can be seen from the graphs that the a weighted equivalent sound pressure level of the noise signal # 4 is 54.1dBA, the noise contribution values of the transformer station to the plant boundary point # 3 are 44.6dBA respectively; as shown in fig. 12 to 13, it can be seen from the graphs that the a-weighted equivalent sound pressure level of the noise signal # 5 is 54.2dBA, and the noise contribution value of the transformer station to the plant boundary point # 5 is 37.1 dBA.
It should be noted that the weighted sound pressure level a is the integrated sound pressure level at the point, and the corresponding sound pressure level in each frequency band is the self-power spectrum of the noise signal. The contribution rate of the substation noise source to all frequency bands at the detection point can be calculated by the above formula 10, and then the contribution rate function of each frequency band and the corresponding total sound pressure level of all frequency bands can be calculated according to the above formula 9.
Example 2
In the present example, the environmental noise of the factory boundary of the 500kV substation is taken as a scene, as shown in fig. 14, which is a field environment positioning diagram of the 500kV substation in the present example, nine 500kV reactors and two 500kV transformers are provided in the field of the substation, and are main noise sources of the substation; the field environment includes social environment noise and the like in addition to the noise of the reactor and the transformer.
When the noise emission detection method provided by the application is adopted for noise detection, as shown in fig. 14, a movable probe is arranged on a transformer # 1, and a vibration probe is arranged on the surface of a reactor # 2; #3, #4, and #5 are plant boundary environmental noise measurement points and are arranged at 1m outside the plant boundary of the transformer substation, 0.5m above the enclosure.
By testing that the noise of the two transformers is stable noise, the noise signal and the vibration signal of 1min are detected at this time.
After the detection is finished, the vibration signals #1 and #2 of the transformer # 1 and the reactor # 2 are respectively collected, and the cross correlation rate r of the vibration signals #1 and #2 is calculated to be 99% > 98%, so that the two vibration signals are the same type of sound source.
A vibration probe is installed on a transformer # 1 or a reactor # 2, noise probes are respectively arranged at plant boundary measuring points # 3, #4 and #5, vibration signals, noise signals #3, #4 and #5 are collected, self-power spectrums corresponding to the noise signals #3, #4 and #5 respectively and contribution rate spectrums of the vibration signals to the noise signals are calculated, as shown in fig. 15-16, it can be seen from the graphs that the A weighted equivalent sound pressure level of the noise signal # 3 is 67.0dBA, and the noise contribution value of the transformer station to the plant boundary measuring point # 3 is 66.8dBA respectively; as shown in fig. 17 to 18, it can be seen from the graphs that the a weighted equivalent sound pressure level of the noise signal # 4 is 63.8dBA, the noise contribution values of the transformer station to the plant boundary point # 3 are 63.2dBA respectively; as shown in fig. 19 to 20, it can be seen from the graphs that when the a-weighted equivalent sound pressure level of the noise signal # 5 is 62.6dBA, the noise contribution value of the transformer station to the plant boundary point # 5 is 61.9 dBA.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for executing all or part of the steps of the method described in the embodiments of the present application through a computer device (which may be a personal computer, a server, or a network device). And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A system for detecting environmental noise emission of a substation factory boundary, comprising: the system comprises an acquisition probe module, a data acquisition instrument and a data processing module;
the acquisition probe module comprises a vibration probe and a noise probe;
the vibration probe is arranged on the pre-acquired noise-generating equipment body and is used for acquiring a vibration signal of the pre-acquired noise-generating equipment body;
the noise probe is arranged at a preset plant boundary measuring point and is used for acquiring a noise signal of the preset plant boundary measuring point within preset time;
the data acquisition instrument is used for acquiring the vibration signal and the noise signal which are respectively acquired by the vibration probe and the noise probe;
the data processing module is used for receiving the vibration signal and the noise signal acquired by the data acquisition instrument at the same time, and calculating a sound pressure level contribution value of the vibration signal to the noise signal according to the vibration signal and the noise signal, so as to acquire a noise emission value of the preset plant boundary measuring point.
2. The system for detecting environmental noise emission of substation factory boundary according to claim 1, further comprising a GPS positioning module electrically connected to the data acquisition instrument for positioning the vibration probe and the noise probe and for time synchronizing signal acquisition of the vibration probe and the noise probe.
3. The system for detecting environmental noise emission of substation plant boundaries of claim 1, wherein the vibration probe comprises a vibration probe a and a vibration probe B;
the vibration probe A is arranged on the noise generating equipment body A and is used for acquiring a vibration signal G of the noise generating equipment body A;
the vibration probe B is arranged on the noise generating equipment body B and is used for acquiring a vibration signal K of the noise generating equipment body B;
the data processing module is further configured to obtain a corresponding vibration acceleration frequency spectrum G (f) and a corresponding vibration acceleration frequency spectrum K (f) according to the vibration signal G and the vibration signal K in the same time, calculate a cross correlation value of the vibration signal G and the vibration signal K according to a corresponding vibration frequency phase and amplitude in the vibration acceleration frequency spectrum G (f) and the vibration acceleration frequency spectrum K (f), and determine that the noise generating device body a and the noise generating device body B are the same type of noise generating device when the cross correlation value is greater than or equal to 0.98; and when the cross correlation value is less than 0.98, judging that the noise generating equipment body A and the noise generating equipment body B are different types of noise generating equipment.
4. The system for detecting the environmental noise emission of the substation factory boundary according to claim 3, wherein the number of the vibration probes is a plurality of vibration probes, the vibration probes are respectively and correspondingly arranged on a plurality of pre-acquired noise-generating device bodies, the number of the noise probes is a plurality of noise probes, and the noise probes are respectively and correspondingly arranged on a plurality of preset factory boundary measuring points;
the pre-acquired noise generating equipment bodies are different types of noise generating equipment, and the preset plant boundary measuring points are not overlapped.
5. The substation factory boundary environmental noise emission detection system according to claim 1 or 2, further comprising a vibration calibrator and a noise calibrator, the vibration calibrator being electrically connected to the vibration probe for calibrating the vibration probe; the noise calibrator is electrically connected with the noise probe and is used for calibrating the noise probe.
6. The method for detecting the environmental noise emission of the transformer substation factory boundary is applied to the system for detecting the environmental noise emission of the transformer substation factory boundary, and is characterized by comprising the following steps of:
s101: acquiring a vibration signal of a noise-generating equipment body acquired in advance through a vibration probe, and acquiring a noise signal of a preset plant boundary measuring point within preset time through the noise probe;
s102: acquiring the vibration signal and the noise signal respectively acquired by the vibration probe and the noise probe through a data acquisition instrument;
s103: and receiving the vibration signal and the noise signal acquired by the data acquisition instrument at the same time through a data processing module, and calculating a sound pressure level contribution value of the vibration signal to the noise signal according to the vibration signal and the noise signal so as to obtain a noise emission value of the preset plant boundary measuring point.
7. The method for detecting environmental noise emission of substation plant according to claim 6, wherein said step S101 is preceded by: and positioning the vibration probe and the noise probe through a GPS positioning module, and performing time synchronization on the vibration probe and the noise probe.
8. The method for detecting environmental noise emission of substation plant according to claim 6, wherein the step S101 specifically includes:
s1011: acquiring a vibration signal G of a noise generating equipment body A through a vibration probe A, and acquiring a vibration signal K of a noise generating equipment body B through a vibration probe B;
s1012: after the data processing module acquires a corresponding vibration acceleration frequency spectrum G (f) and a corresponding vibration acceleration frequency spectrum K (f) according to the vibration signal G and the vibration signal K in the same time, calculating a cross correlation value of the vibration signal G and the vibration signal K according to a corresponding vibration frequency phase and amplitude in the vibration acceleration frequency spectrum G (f) and the vibration acceleration frequency spectrum K (f), and when the cross correlation value is not less than 0.98, judging that the noise generating equipment body A and the noise generating equipment body B are the same type of noise generating equipment; when the cross correlation value is less than 0.98, judging that the noise generating equipment body A and the noise generating equipment body B are different types of noise generating equipment;
s1013: the vibration probes are used for correspondingly acquiring vibration signals of a plurality of different noise-generating equipment bodies respectively, and meanwhile, the noise probes are used for correspondingly acquiring noise signals of a plurality of non-coincident preset plant boundary measuring points respectively.
9. The method for detecting environmental noise emission of substation plant according to claim 6, wherein said step S101 is preceded by the step of: the vibration probe is calibrated through a vibration calibrator, and the noise probe is calibrated through a noise calibrator.
10. The method for detecting environmental noise emission of substation plant according to claim 6, wherein step S103 specifically includes:
s1031: after the vibration signal and the noise signal acquired by the data acquisition instrument at the same time are received by a data processing module, filtering the vibration signal and the noise signal;
s1032: acquiring a vibration acceleration value and a vibration acceleration frequency in a corresponding data segment from a vibration signal data segment intercepted in advance, and acquiring a corresponding noise frequency through the noise signal, wherein the absolute time of the vibration signal data segment intercepted in advance is the same as that of the noise signal;
s1033: calculating the self-power spectrum of a noise signal according to the noise frequency, and calculating the self-power spectrum of a vibration signal according to the vibration acceleration value and the vibration acceleration frequency;
s1034: and calculating the sound pressure level contribution value of the vibration signal to the noise signal according to the self-power spectrum of the noise signal and the self-power spectrum of the vibration signal, thereby obtaining the noise emission value of the preset plant boundary measuring point.
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