CN114623925A - Intelligent detection system and method for field noise of power grid transformation project - Google Patents
Intelligent detection system and method for field noise of power grid transformation project Download PDFInfo
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Abstract
The invention relates to a system and a method for intelligently detecting field noise of a power grid transformation project, wherein the system comprises: the environment noise detection module is used for sequentially acquiring, amplifying and carrying out analog-to-digital conversion on the sound signals of the engineering site and analyzing the signals subjected to the analog-to-digital conversion based on a noise weighting analysis algorithm; the noise analysis controller is used for storing the noise decibel value and judging whether the numerical value of the noise decibel value is greater than a preset noise environmental protection upper limit value or not, and if so, generating an alarm signal; and the construction site display system is used for displaying the noise decibel value in real time and carrying out alarm reminding according to the alarm signal. The invention can accurately detect the noise of the power grid engineering construction site, and store the noise detection result in real time, and when the noise index exceeds the environmental protection limit value, the construction site display system and the project management department display system alarm the noise exceeding.
Description
Technical Field
The invention relates to the technical field of noise detection and environmental protection management in the construction period of power grid engineering, in particular to an intelligent detection system and method for field noise of power grid transformation engineering.
Background
The scale of the power grid is rapidly developed, the number of power grid engineering construction is increased year by year, and the speed of the power grid engineering construction is carried out in a day-to-day mode. The construction links of the power grid project are more, the use of construction machinery is more, and various forms of environmental pollution such as noise are brought. Noise pollution on the construction site of the power grid project brings serious influence on construction units, surrounding residents and projects, various environmental complaints are continuous, and huge pressure is brought to environmental protection departments and city management departments.
At present, no effective power grid engineering construction site noise detection device exists, so that power grid engineering construction site constructors and project management department project managers can accurately master the construction site noise condition in real time and accurately judge whether the site noise exceeds the upper limit of the environmental protection index. When the noise of the power grid engineering construction site exceeds the upper limit of the environmental protection index, no effective and accurate device accurately prompts construction personnel of the power grid engineering site and management personnel of a project management department to take construction and management measures, so that the noise of the power grid engineering construction site is effectively reduced, and the environmental protection of the power grid engineering construction site is influenced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a system and a method for intelligently detecting the field noise of the power grid transformation project.
In order to achieve the purpose, the invention provides the following scheme:
the utility model provides a power grid transformation engineering scene noise intellectual detection system, includes:
the environment noise detection module is used for sequentially acquiring, amplifying and carrying out analog-to-digital conversion on sound signals of an engineering site, and analyzing the signals subjected to the analog-to-digital conversion based on an 1/3 octave A sound level noise weighting analysis algorithm to obtain noise decibel values;
the noise analysis controller is connected with the environmental noise detection module and used for storing the noise decibel value and judging whether the numerical value of the noise decibel value is greater than a preset noise environmental protection upper limit value or not, and if yes, an alarm signal is generated;
and the construction site display system is connected with the noise analysis controller and used for displaying the noise decibel value in real time and carrying out alarm reminding according to the alarm signal.
Preferably, the method further comprises the following steps:
and the project management center data storage and display system is connected with the noise analysis controller and is used for storing the noise decibel value in real time and displaying the overrun information when the numerical value of the noise decibel value is greater than a preset noise environmental protection upper limit value.
Preferably, the method further comprises the following steps:
and the data transmission module is used for connecting the project management center data storage and display system with the noise analysis controller through the data transmission module.
Preferably, the ambient noise detection module includes:
the noise sensor is used for collecting the sound signal of an engineering site;
the amplifying circuit is connected with the noise sensor and is used for amplifying the sound signal;
the analog-to-digital conversion circuit is connected with the amplifying circuit and is used for performing analog-to-digital conversion on the amplified sound signal to obtain a discrete digital signal;
and the noise analysis unit is connected with the analog-to-digital conversion circuit and used for carrying out 1/3 octave A weighting network curve weighting calculation on the discrete digital signals to obtain the noise decibel value.
Preferably, the noise analyzing unit includes:
a sound pressure calculation subunit, configured to calculate, based on a first formula, effective sound pressures of the single discrete digital signals in the respective frequency bands; the first formula is
Wherein p iseEffective sound pressure, T is the time period for measuring effective sound pressure, and p is the single time period detected by the noise sensor1/3 instantaneous sound pressure of the discrete digital signal in each frequency band at a frequency doubling band;
a total sound pressure calculating subunit, configured to calculate total sound pressures of n different noise sources in each frequency band of the 1/3 octave frequency bands detected by the noise sensor according to a second formula; the second formula is
Wherein, p'eThe total sound pressure for a composite sound field; p is a radical ofeiSound pressure of the ith noise source;
a sound pressure level calculating subunit, configured to calculate 1/3 a sound pressure level of noise in each frequency band in the frequency doubling band according to a third formula; the third formula is
Wherein L ispSound pressure level p of noise in each frequency band at 1/3 frequency multiplication band0＝2×10- 5Pa，p0The reference sound pressure is used;
a total sound pressure level calculating subunit configured to calculate a noise total sound pressure level according to a fourth formula; the fourth formula is
Wherein L isptTotal sound pressure level of noise, L, detected for ambient noise sensorpiThe noise sound pressure level for the ith frequency band; and the total sound pressure level of the noise is the decibel value of the noise.
An intelligent detection method for field noise of a power grid transformation project comprises the following steps:
sequentially collecting, amplifying and carrying out analog-to-digital conversion on sound signals of an engineering site, and analyzing the signals subjected to the analog-to-digital conversion based on an 1/3 octave A sound level noise weighting analysis algorithm to obtain noise decibel values;
storing the noise decibel value, judging whether the numerical value of the noise decibel value is greater than a preset noise environmental protection upper limit value or not, and if so, generating an alarm signal;
and displaying the noise decibel value in real time, and alarming and reminding according to the alarm signal.
Preferably, the method further comprises the following steps:
and storing the noise decibel value in real time, and displaying overrun information when the numerical value of the noise decibel value is greater than a preset noise environmental protection upper limit value.
Preferably, the acquiring, amplifying, analog-to-digital converting the sound signal of the engineering site in sequence, and analyzing the analog-to-digital converted signal based on 1/3 octave a sound level noise weighting analysis algorithm to obtain a noise decibel value includes:
collecting the sound signal of an engineering site;
amplifying the sound signal;
performing analog-to-digital conversion on the amplified sound signal to obtain a discrete digital signal;
and carrying out 1/3 octave A weighting network curve weighting calculation on the discrete digital signals to obtain the noise decibel value.
Preferably, the performing 1/3 octave a weighting network curve weighting calculation on the discrete digital signal to obtain the decibel value of noise includes:
calculating effective sound pressure of the discrete digital signal on each frequency band based on a first formula; the first formula is
Wherein p iseT is the effective sound pressure, T is the time period for measuring the effective sound pressure, p is the instantaneous sound pressure of a single discrete digital signal at 1/3 frequency doubling bands within a single time period detected by the noise sensor;
calculating the total sound pressure of n different noise sources in each frequency band of 1/3 octave frequency bands detected by the noise sensor according to a second formula; the second formula is
Wherein, p'eThe total sound pressure for a composite sound field; p is a radical ofeiSound pressure for the ith noise source;
calculating 1/3 a noise sound pressure level of each frequency band in the frequency doubling band according to a third formula; the third formula is
Wherein L ispSound pressure level p of noise in each frequency band at 1/3 frequency multiplication band0＝2×10-5Pa，p0The reference sound pressure is used;
calculating the total sound pressure level of the noise according to a fourth formula; the fourth formula is
Wherein L isptTotal sound pressure level of noise, L, detected for ambient noise sensorpiThe noise sound pressure level for the ith frequency band; and the total sound pressure level of the noise is the decibel value of the noise.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a system and a method for intelligently detecting field noise of a power grid transformation project, wherein the system comprises: the environment noise detection module is used for sequentially acquiring, amplifying and carrying out analog-to-digital conversion on sound signals of an engineering site, and analyzing the signals subjected to the analog-to-digital conversion based on an 1/3 octave A sound level noise weighting analysis algorithm to obtain noise decibel values; the noise analysis controller is connected with the environmental noise detection module and is used for storing the noise decibel value and judging whether the numerical value of the noise decibel value is greater than a preset noise environmental protection upper limit value or not, and if yes, an alarm signal is generated; and the construction site display system is connected with the noise analysis controller and used for displaying the noise decibel value in real time and carrying out alarm reminding according to the alarm signal. The invention can accurately detect the noise of the power grid engineering construction site, store the noise detection result in real time, and when the noise index exceeds the environmental protection limit value, the construction site display system and the project management department display system alarm the exceeding of the noise, and in the specific embodiment, the invention can also display the noise in real time in the power grid transformation engineering site and the project management center.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments 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 to obtain other drawings without inventive exercise.
FIG. 1 is a system block diagram in an embodiment provided by the present invention;
FIG. 2 is a functional block diagram of an ambient noise detection module according to an embodiment of the present invention;
FIG. 3 is a functional block diagram of a noise analysis controller according to an embodiment of the present invention;
FIG. 4 is a schematic illustration of a job site display system in an embodiment provided by the present invention;
FIG. 5 is a schematic diagram of a project management center data storage and display system according to an embodiment of the present invention;
fig. 6 is a schematic flow chart of an 1/3 octave weighting sound pressure level algorithm in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.
The terms "first," "second," "third," and "fourth," etc. in the description and claims of this application and in the accompanying drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, the inclusion of a list of steps, processes, methods, etc. is not limited to only those steps recited, but may alternatively include additional steps not recited, or may alternatively include additional steps inherent to such processes, methods, articles, or devices.
The invention aims to provide an intelligent detection system and method for site noise of a power grid transformation project, which can accurately detect the noise of a power grid project construction site, store the noise detection result in real time, and carry out noise overproof alarm by a construction site display system and a project management department display system when the noise index exceeds an environmental protection limit value.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a system structure diagram in an embodiment provided by the present invention, and as shown in fig. 1, the present invention provides an intelligent detection system for field noise in a power grid transformation project, including:
the environment noise detection module is used for sequentially acquiring, amplifying and carrying out analog-to-digital conversion on sound signals of an engineering site, and analyzing the signals subjected to the analog-to-digital conversion based on an 1/3 octave A sound level noise weighting analysis algorithm to obtain noise decibel values;
the noise analysis controller is connected with the environmental noise detection module and used for storing the noise decibel value and judging whether the numerical value of the noise decibel value is greater than a preset noise environmental protection upper limit value or not, and if yes, an alarm signal is generated;
and the construction site display system is connected with the noise analysis controller and used for displaying the noise decibel value in real time and carrying out alarm reminding according to the alarm signal.
And the project management center data storage and display system is connected with the noise analysis controller and is used for storing the noise decibel value in real time and displaying the overrun information when the numerical value of the noise decibel value is greater than a preset noise environment-friendly upper limit value.
And the project management center data storage and display system is connected with the noise analysis controller through the data transmission module.
Specifically, this embodiment includes environmental noise detection module, realizes the on-the-spot noise detection of electric wire netting transformer engineering. The noise analysis controller is used for carrying out technical processing, local storage and remote transmission on the site noise of the power transformation project of the power grid, which is detected by the environmental noise detection module; in addition, the controller analyzes and calculates to judge whether the field noise of the power grid transformation project exceeds the upper limit value of the environmental protection requirement. And the data transmission module transmits the noise processed by the noise analysis controller technology to a project management center data storage and display system through a wireless communication network, a mobile communication network and a wired network. And the construction site display screen displays the site noise of the power transformation project on the power grid power transformation project site and displays whether the site noise of the power transformation project exceeds the upper limit value of the environmental protection requirement or not. The project management center data storage and display system realizes the storage of the on-site noise data information of the power transformation project, displays the on-site noise of the power transformation project in the power grid project construction project management center, and displays whether the on-site noise of the power transformation project exceeds the upper limit value of the environmental protection requirement.
Preferably, the ambient noise detection module includes:
the noise sensor is used for collecting the sound signal of an engineering site;
the amplifying circuit is connected with the noise sensor and is used for amplifying the sound signal;
the analog-to-digital conversion circuit is connected with the amplifying circuit and is used for performing analog-to-digital conversion on the amplified sound signal to obtain a discrete digital signal;
and the noise analysis unit is connected with the analog-to-digital conversion circuit and used for carrying out 1/3 octave A weighting network curve weighting calculation on the discrete digital signals to obtain the noise decibel value.
Fig. 2 is a schematic functional structure diagram of an environmental noise detection module in an embodiment of the present invention, and as shown in fig. 2, the environmental noise detection module implements various environmental noise monitoring functions on a power grid transformation project site, and outputs an output quantity thereof in a decibel form. The output signal mode used by the system adopts an I2C bus mode, and an environmental noise sensor is installed on a signal bus. After the environmental noise sensor detects that a sound signal is processed by the noise sensor, the amplifying circuit, the analog-to-digital conversion and other links, an 1/3 octave A sound level noise weighting analysis algorithm is used for converting the discrete signal obtained by analysis into a decibel value, and the measurement range can reach 30-130 dB.
Preferably, the noise analyzing unit includes:
a sound pressure calculation subunit, configured to calculate, based on a first formula, effective sound pressures of the single discrete digital signals in the respective frequency bands; the first formula is
Wherein p iseT is the effective sound pressure, T is the time period for measuring the effective sound pressure, p is the instantaneous sound pressure of a single discrete digital signal at 1/3 frequency doubling bands within a single time period detected by the noise sensor;
a total sound pressure calculating subunit, configured to calculate total sound pressures of n different noise sources in each frequency band of the 1/3 octave frequency bands detected by the noise sensor according to a second formula; the second formula is
Wherein, p'eThe total sound pressure for a composite sound field; p is a radical ofeiSound pressure of the ith noise source;
a sound pressure level calculating subunit, configured to calculate 1/3 a sound pressure level of noise in each frequency band in the frequency doubling band according to a third formula; the third formula is
Wherein L ispSound pressure level p of noise in each frequency band at 1/3 frequency multiplication band0＝2×10- 5Pa，p0The reference sound pressure is used;
a total sound pressure level calculating subunit configured to calculate a noise total sound pressure level according to a fourth formula; the fourth formula is
Wherein L isptTotal sound pressure level of noise, L, detected for ambient noise sensorpiThe noise sound pressure level for the ith frequency band; and the total sound pressure level of the noise is the decibel value of the noise.
Specifically, the specific calculation process of the noise analysis algorithm in this embodiment is as follows:
1)1/3 octave A sound level noise weighting analysis algorithm calculation process
After the noise vibration energy of the power grid power transformation project site noise detection point is collected by an environment noise microphone and data collection equipment, the pulse signal of the sound pressure is subjected to Fourier processing and converted into a discrete digital signal which can be identified by a computer system, and after 1/3 octave A weighting network curve weighting calculation is carried out on the discrete digital signal, the noise decibel value is obtained.
2)1/3 octave A sound level noise weighting analysis algorithm calculation implementation process, as shown in figure 6, including the steps of collecting sensor sound pressure data, performing fast Fourier transform on a sound pressure signal, searching a peak value, judging whether weighting correction is performed, if yes, interpolating and calculating a decibel correction value at a corresponding frequency according to a weighting network reference value, converting the decibel correction value into a sound pressure correction coefficient, and entering 'if not' through multiplying the sound pressure by the correction coefficient; if not, according to the frequency band range defined by the 1/3 frequency program, calculating the frequency band sound pressure and the sound pressure level by using an energy summation method, and finally calculating the total boost level/A sound pressure level according to the energy summation method. The method comprises the following steps:
(1) calculation of 1/3 octave band Single Point effective Sound pressure calculation for each band
According to 1/3 times frequency band division, calculating effective sound pressure p of single sound signal in each frequency band collected by environment noise sensor according to formula (1)e，
In the formula: p is a radical ofeT is the time period for measuring the effective sound pressure, and p is the instantaneous sound pressure of 1/3 frequency band single sound signal in each frequency band within a single time period detected by the ambient noise sensor.
(2) Total sound pressure calculation of sound fields in each frequency band of synthesized 1/3 octave frequency band
According to equation (2), the total sound pressure of n different noise sources in each frequency band of the 1/3 octave band detected by the ambient noise sensor is calculated
In the formula: p is a radical ofeFor synthesizing the total sound pressure, p, of the sound fieldeiIs the sound pressure of the ith noise source.
(3)1/3 calculation of noise sound pressure level of each frequency band in frequency multiplication band
According to the formula (3), calculating 1/3 the noise sound pressure level of each frequency band in the frequency doubling band
In the formula: lp is the sound pressure level of noise in each frequency band under 1/3 frequency multiplication band, peiSound pressure, p, of the i-th noise source for each frequency band02 × 10-5Pa, the reference sound pressure.
(4) Calculating the total sound pressure level of the noise through the sound pressure level of the frequency band to obtain a noise decibel value
According to the 1/3 octave frequency band division, the band sound pressure of each frequency band is obtained and converted into decibel value. The final result is shown in the form of a histogram, i.e., an 1/3 octave spectrum. After the sound pressure levels of the frequency bands are calculated, the total sound pressure level is usually obtained by an energy summation method in engineering. The relationship between the total sound pressure level and the sound pressure level of the frequency band is
Calculating the total sound pressure level of the noise detected by the environmental noise sensor according to the formula (4) according to the sound pressure level of the noise of each frequency band, and obtaining the decibel value of the noise
In the formula: l isptTotal sound pressure level of noise, L, detected for ambient noise sensorpiThe noise sound pressure level of the ith frequency band.
In this embodiment, the 1/3 octave a-level noise weighting analysis algorithm provides the site noise detection basis analysis data for noise analysis. The specific working relation between the 1/3 octave A sound level noise weighting analysis algorithm and the intelligent detection system is as follows: the noise sensor collects real-time noise data of an engineering field, and analog signals collected by the sensor are processed by using modules such as an amplifying circuit, a voltage stabilizing circuit and the like to obtain stable analog signals. And then, converting the vibration energy of the noise into a discrete digital signal capable of representing the power grid transformation project site by using an analog-to-digital conversion module, and realizing computer identification and data transmission.
The discrete digital signals are calculated and analyzed by applying 1/3 octave A sound level noise weighting analysis algorithm and a computer internal noise analysis calculation application program, and are converted into noise decibel values which can be represented by numbers.
The sound decibel value can accurately represent the noise condition of the power grid power transformation project site, and can be logically judged with the set upper limit value of the environmental protection requirement of the noise of the power grid power transformation project site to judge whether the actually measured noise of the project site meets the standard requirement.
Fig. 3 is a schematic functional structure diagram of a noise analysis controller in the embodiment provided by the present invention, and as shown in fig. 3, the noise analysis controller in the embodiment performs technical processing on the substation engineering field noise analysis data sent by the environmental noise detection module, and performs local storage on the noise detection data after analysis, and simultaneously implements remote transmission. Meanwhile, the noise analysis controller realizes manual setting of the environmental protection requirement upper limit value of the site noise of the power grid transformation project, and carries out logic size judgment on the collected site noise of the real-time power transformation project and the environmental protection requirement upper limit value of the site noise of the power grid transformation project.
Specifically, the data transmission module in this embodiment adopts a 4G full-band data transmission module supporting full network communication, so as to realize high-fidelity transmission of noise detection information of the intelligent field noise detection system in the power grid transformation project.
Fig. 4 is a schematic diagram of a construction site display system in an embodiment provided by the present invention, and as shown in fig. 4, the construction site display system in this embodiment uses a high-fidelity LED display system to achieve real-time display of the site environmental noise of the power grid transformation project, and display whether the site noise of the power grid transformation project exceeds the upper limit value of the site noise environmental protection requirement of the power grid transformation project.
Fig. 5 is a schematic diagram of a project management center data storage and display system in an embodiment provided by the present invention, and as shown in fig. 5, the project management center data storage and display system realizes real-time storage of power transformation project site noise data, and realizes real-time display of power grid power transformation project site environmental noise on a computer display system, and displays whether the power grid power transformation project site noise exceeds a power grid power transformation project site noise environmental protection requirement upper limit value.
The embodiment also provides an intelligent detection method for the field noise of the power grid transformation project, which comprises the following steps:
sequentially collecting, amplifying and carrying out analog-to-digital conversion on sound signals of an engineering site, and analyzing the signals subjected to the analog-to-digital conversion based on an 1/3 octave A sound level noise weighting analysis algorithm to obtain noise decibel values;
storing the noise decibel value, judging whether the numerical value of the noise decibel value is greater than a preset noise environmental protection upper limit value or not, and if so, generating an alarm signal;
and displaying the noise decibel value in real time, and alarming and reminding according to the alarm signal.
Preferably, the method further comprises the following steps:
and storing the noise decibel value in real time, and displaying overrun information when the numerical value of the noise decibel value is greater than a preset noise environmental protection upper limit value.
Preferably, the acquiring, amplifying, analog-to-digital converting the sound signal of the engineering site in sequence, and analyzing the analog-to-digital converted signal based on 1/3 octave a sound level noise weighting analysis algorithm to obtain a noise decibel value includes:
collecting the sound signal of an engineering site;
amplifying the sound signal;
performing analog-to-digital conversion on the amplified sound signal to obtain a discrete digital signal;
and carrying out 1/3 octave A weighting network curve weighting calculation on the discrete digital signals to obtain the noise decibel value.
Preferably, the performing 1/3 octave a weighting network curve weighting calculation on the discrete digital signal to obtain the decibel value of noise includes:
calculating effective sound pressure of the discrete digital signal on each frequency band based on a first formula; the first formula is
Wherein p iseT is the effective sound pressure, T is the time period for measuring the effective sound pressure, p is the instantaneous sound pressure of a single discrete digital signal at 1/3 frequency doubling bands within a single time period detected by the noise sensor;
calculating the total sound pressure of n different noise sources in each frequency band of 1/3 octave frequency bands detected by the noise sensor according to a second formula; the second formula is
Wherein, p'eThe total sound pressure for a composite sound field; p is a radical ofeiSound pressure of the ith noise source;
calculating 1/3 a noise sound pressure level of each frequency band in the frequency doubling band according to a third formula; the third formula is
Wherein L ispSound pressure level p of noise in each frequency band at 1/3 frequency multiplication band0＝2×10-5Pa，p0The reference sound pressure is used;
calculating the total sound pressure level of the noise according to a fourth formula; the fourth formula is
Wherein L isptTotal sound pressure level of noise, L, detected for ambient noise sensorpiThe noise sound pressure level for the ith frequency band; and the total sound pressure level of the noise is the decibel value of the noise.
The invention has the following beneficial effects:
the invention can accurately detect the noise of the power grid engineering construction site, store the noise detection result in real time and display the noise detection result in real time in the power grid transformation engineering site and the project management center. And when the noise index exceeds the environmental protection limit value, the construction site display system and the project management department display system alarm the noise exceeding.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The method disclosed by the embodiment corresponds to the system disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the system part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. The utility model provides a power grid transformation engineering site noise intellectual detection system which characterized in that includes:
the environment noise detection module is used for sequentially acquiring, amplifying and carrying out analog-to-digital conversion on sound signals of an engineering site, and analyzing the signals subjected to the analog-to-digital conversion based on an 1/3 octave A sound level noise weighting analysis algorithm to obtain noise decibel values;
the noise analysis controller is connected with the environmental noise detection module and used for storing the noise decibel value and judging whether the numerical value of the noise decibel value is greater than a preset noise environmental protection upper limit value or not, and if yes, an alarm signal is generated;
and the construction site display system is connected with the noise analysis controller and used for displaying the noise decibel value in real time and carrying out alarm reminding according to the alarm signal.
2. The system of claim 1, further comprising:
and the project management center data storage and display system is connected with the noise analysis controller and is used for storing the noise decibel value in real time and displaying the overrun information when the numerical value of the noise decibel value is greater than a preset noise environment-friendly upper limit value.
3. The system of claim 2, further comprising:
and the data transmission module is used for connecting the project management center data storage and display system with the noise analysis controller through the data transmission module.
4. The intelligent detection system for the field noise of the power grid transformation project according to claim 1, wherein the environmental noise detection module comprises:
the noise sensor is used for collecting the sound signal of an engineering site;
the amplifying circuit is connected with the noise sensor and is used for amplifying the sound signal;
the analog-to-digital conversion circuit is connected with the amplifying circuit and is used for performing analog-to-digital conversion on the amplified sound signal to obtain a discrete digital signal;
and the noise analysis unit is connected with the analog-to-digital conversion circuit and used for carrying out 1/3 octave A weighting network curve weighting calculation on the discrete digital signals to obtain the noise decibel value.
5. The intelligent detection system for the field noise of the power grid transformation project according to claim 4, wherein the noise analysis unit comprises:
a sound pressure calculation subunit, configured to calculate, based on a first formula, effective sound pressures of the single discrete digital signals in the respective frequency bands; the first formula is
Wherein p iseT is the effective sound pressure, T is the time period for measuring the effective sound pressure, p is the instantaneous sound pressure of a single discrete digital signal at 1/3 frequency doubling bands within a single time period detected by the noise sensor;
a total sound pressure calculating subunit, configured to calculate total sound pressures of n different noise sources in each frequency band of the 1/3 octave frequency bands detected by the noise sensor according to a second formula; the second formula is
Wherein, p'eThe total sound pressure for a composite sound field; p is a radical ofeiSound pressure of the ith noise source;
a sound pressure level calculating subunit, configured to calculate 1/3 a sound pressure level of noise in each frequency band in the frequency doubling band according to a third formula; what is needed isThe third formula is
Wherein L isp1/3 frequency multiplication band lower band each frequency band noise sound pressure level, p0＝2×10-5Pa，p0The reference sound pressure is set;
a total sound pressure level calculating subunit, configured to calculate a noise total sound pressure level according to a fourth formula; the fourth formula is
Wherein L isptTotal sound pressure level of noise, L, detected for ambient noise sensorpiThe noise sound pressure level for the ith frequency band; and the total sound pressure level of the noise is the decibel value of the noise.
6. An intelligent detection method for field noise of a power grid transformation project is characterized by comprising the following steps:
sequentially collecting, amplifying and carrying out analog-to-digital conversion on sound signals of an engineering site, and analyzing the signals subjected to the analog-to-digital conversion based on an 1/3 octave A sound level noise weighting analysis algorithm to obtain noise decibel values;
storing the noise decibel value, judging whether the numerical value of the noise decibel value is greater than a preset noise environmental protection upper limit value or not, and if so, generating an alarm signal;
and displaying the noise decibel value in real time, and alarming and reminding according to the alarm signal.
7. The intelligent detection method for the field noise of the power grid transformation project according to claim 6, further comprising:
and storing the noise decibel value in real time, and displaying overrun information when the numerical value of the noise decibel value is greater than a preset noise environmental protection upper limit value.
8. The intelligent power grid transformation project site noise detection method according to claim 6, wherein the steps of collecting, amplifying and analog-to-digital converting sound signals of a project site in sequence, and analyzing the analog-to-digital converted signals based on an 1/3 octave A sound level noise weighting analysis algorithm to obtain noise decibel values comprise:
collecting the sound signal of an engineering site;
amplifying the sound signal;
performing analog-to-digital conversion on the amplified sound signal to obtain a discrete digital signal;
and carrying out 1/3 octave A weighting network curve weighting calculation on the discrete digital signals to obtain the noise decibel value.
9. The method for intelligently detecting the field noise of the power grid transformation project according to claim 8, wherein the step of performing 1/3 octaves A weighting network curve weighting calculation on the discrete digital signals to obtain the noise decibel value comprises the steps of:
calculating effective sound pressure of the discrete digital signal on each frequency band based on a first formula; the first formula is
Wherein p iseT is the effective sound pressure, T is the time period for measuring the effective sound pressure, p is the instantaneous sound pressure of a single discrete digital signal in each frequency band at 1/3 frequency doubling band within a single time period detected by the noise sensor;
calculating the total sound pressure of n different noise sources in each frequency band of 1/3 octave frequency bands detected by the noise sensor according to a second formula; the second formula is
Wherein, p'eThe total sound pressure for a composite sound field; p is a radical ofeiSound pressure for the ith noise source;
calculating 1/3 a noise sound pressure level of each frequency band in the frequency doubling band according to a third formula; the third formula is
Wherein L ispSound pressure level p of noise in each frequency band at 1/3 frequency multiplication band0＝2×10-5Pa，p0The reference sound pressure is set;
calculating the total sound pressure level of the noise according to a fourth formula; the fourth formula is
Wherein L isptFor the total sound pressure level, L, of the noise detected by the ambient noise sensorpiThe noise sound pressure level for the ith frequency band; and the total sound pressure level of the noise is the decibel value of the noise.
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