CN112116901B - Method for improving acoustic subjective evaluation index of medium-low pressure gas pressure regulating tank - Google Patents
Method for improving acoustic subjective evaluation index of medium-low pressure gas pressure regulating tank Download PDFInfo
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- 229920002554 vinyl polymer Polymers 0.000 claims description 6
- 229920000877 Melamine resin Polymers 0.000 claims description 4
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- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 4
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- 239000007789 gas Substances 0.000 abstract description 150
- 230000009467 reduction Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 239000002737 fuel gas Substances 0.000 abstract description 3
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- 230000006872 improvement Effects 0.000 description 6
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- G—PHYSICS
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- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
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Abstract
The application relates to a method for improving an acoustic subjective evaluation index of a medium-low pressure gas pressure regulating box, which relates to the technical field of sound absorption and noise reduction of the medium-low pressure gas pressure regulating box and comprises the following steps: s1, acquiring noise data of external radiation of a gas pressure regulating box; s2, acquiring subjective evaluation indexes of noise data sound quality; s3, optimizing the sound quality of the gas pressure regulating box, analyzing subjective evaluation indexes of noise data of the gas pressure regulating box, grading the noise energy, and optimizing the structure of the gas pressure regulating box according to different noise emission energies after grading so as to improve the sound quality of the gas pressure regulating box. The method has the effect of improving the acoustic subjective evaluation indexes of the medium-low pressure fuel gas pressure regulating box with different noise pollution levels.
Description
Technical Field
The application relates to the technical field of sound absorption and noise reduction of medium-low pressure gas pressure regulating tanks, in particular to a method for improving the acoustic subjective evaluation index of the medium-low pressure gas pressure regulating tanks.
Background
In recent years, along with the continuous improvement of the execution strength of environmental protection policies, clean energy is increasingly used in China. The natural gas is used as the main force of clean energy, the usage amount and the popularity rate of the natural gas are also increased year by year, and thus the high-speed development of the urban gas industry is brought. Numerous medium-low pressure gas pressure regulating boxes are an integral part of each urban gas operation network and are mostly distributed in noise sensitive areas such as residential communities, commercial and residential mixed areas and the like. The areas belong to class 1 areas and class 2 areas according to the acoustic environment function classification, and noise emission in the areas has strict limit requirements and is particularly easy to suffer from related complaints, so that the noise related complaints are reduced, and the noise-related complaints become one of the difficulties faced by a plurality of urban gas operators.
The prior related researches mainly focus on the noise problem management of urban gas high-pressure regulating station boxes or door stations with more serious noise pollution, and the research on the emission noise of the middle-low pressure gas pressure regulating station boxes is almost limited to the total emission sound pressure level or simple spectrum analysis, but more and more complaint records show that the types of pressure regulating boxes with the emission reaching standards or partially reaching standards (reaching standards in daytime) are also complaint of nearby residents and the like.
Through data statistics and special research of the inventor, the sound quality parameter of the noise is a key factor of complaint of the noise. Acoustic quality may be defined as how well auditory events meet the needs of individuals in various ways, with influencing factors including physics (sound field), physiology (auditory perception) and psychology (auditory evaluation). The sound quality is actually an evaluation index combining objective evaluation and subjective evaluation, and is widely applied to parameters describing the noise attribute in the sound quality at present, such as loudness, roughness, shaking degree, sharpness and vexation degree, and an effective mode for reducing the complaint rate is to reduce the total sound pressure level of noise emission, and more importantly, improve the subjective evaluation index of the noise, so that a nearby noise receiver can 'subjectively feel' the influence change of the noise.
Disclosure of Invention
In order to achieve improvement of acoustic subjective evaluation indexes of the medium-low pressure gas pressure regulating tanks with different noise pollution levels, the application provides a method for improving the acoustic subjective evaluation indexes of the medium-low pressure gas pressure regulating tanks.
The method for improving the acoustic subjective evaluation index of the medium-low pressure gas pressure regulating box adopts the following technical scheme:
a method for improving the acoustic subjective evaluation index of a medium-low pressure gas pressure regulating box comprises the following steps:
s1, acquiring noise data of external radiation of a gas pressure regulating box, manually acquiring a noise signal of the gas pressure regulating box in a working state, processing the noise signal to obtain a noise sample, and classifying the noise according to a main generation source of the noise, wherein the main generation source of the noise is divided into noise generated by a gas pressure regulating pipeline system in the gas pressure regulating box, and the noise is generated by rigid connection among the gas pressure regulating pipeline system and a gas pressure regulating box structure and a pressure regulating pipeline in the gas pressure regulating box;
s2, acquiring subjective evaluation indexes of noise data sound quality, wherein attribute parameters of the subjective evaluation indexes of the sound quality comprise loudness, roughness, shaking degree, sharpness and annoyance;
s3, optimizing the sound quality of the gas pressure regulating box, analyzing subjective evaluation indexes of noise data of the gas pressure regulating box, grading the noise energy, and optimizing the structure of the gas pressure regulating box according to different noise emission energies after grading so as to improve the sound quality of the gas pressure regulating box.
Through adopting above-mentioned technical scheme, through gathering, classifying and classifying different gas surge tank noise, and then adopt the targeted improvement that adopts different noise reduction methods to the gas surge tank of different noise pollution characteristics respectively, realize the low-pressure gas surge tank acoustics subjective evaluation index of different noise pollution levels to effectual reduction complain.
Optionally, in step S3, step S31 is included: when the equivalent continuous A sound level is less than 60dB, noise is mainly generated by a gas pressure regulating pipeline system in a gas pressure regulating tank, noise energy is biased to a middle-high frequency band, namely more than 1000Hz one third octave, five surfaces of the inner wall of the gas pressure regulating tank are fully adhered with first sound absorbing materials, the ground in the tank is fully adhered with second sound absorbing materials, the first sound absorbing materials are crushed into 2mm, 3mm and 4mm by using artificial synthetic polymer foaming materials, glue is added according to the proportion of 30%, 30% and 40%, and the density is 220-300kg/m by adopting a mould pressing mode 3 The thickness of the new material is 15-20 mm; the second sound absorbing material is composed of broken stone combined with polyurethane adhesive and has a density of 1600kg/m 2 Is of (a) sound absorptionThe floor is 30-35mm thick.
By adopting the technical scheme, when the equivalent continuous A sound level is smaller than 60dB, noise is mainly generated by a gas pressure regulating pipeline system in the gas pressure regulating box, noise energy is deviated to a medium-high frequency band, namely more than one third octave of 1000Hz, at the moment, the energy of the noise is deviated to the medium-high frequency band, after the gas pressure regulating box is treated by adopting a first sound absorbing material and a second sound absorbing material, the first sound absorbing material adopts an artificially synthesized high molecular foaming material and is crushed into particles with different particle diameters, and three particle size fractions are adopted for mixing, so that more proper sound absorbing gaps are formed between the first sound absorbing materials, when the noise passes through the first sound absorbing material, the vibration is transmitted to the interior of the first sound absorbing material, the noise energy is attenuated due to the fact that the complex interior cells of the noise energy is rubbed with the first sound absorbing material, and therefore the noise sound wave can be weakened, and the absorption effect of the first sound absorbing material on sound waves is shown; the sound absorption ground made of the polyurethane broken stone has higher strength, and meanwhile, the porosity of the sound absorption ground made of the polyurethane broken stone can reach 20-30%, so that noise energy can be absorbed to a larger extent after passing through the polyurethane broken stone ground, and the first sound absorption material and the second sound absorption material are matched with each other, so that the subjective evaluation index of external radiation noise of the gas pressure regulating box, namely, the change of loudness is about 4 or more, the change of sharpness is about 3 or more, and the change of annoyance is about 15 or more, is effectively improved.
Optionally, the first sound absorbing material comprises at least one of FEF foam, PE foam, edm foam.
By adopting the technical scheme, FEF foaming, PE foaming and epdm foaming are adopted, so that the materials are conveniently taken and placed, the sound absorption effect is good, the ageing resistance such as heat resistance and weather resistance is excellent, the service life is long, and the cost performance is high.
Optionally, in step S3, step S32 is further included: when the equivalent continuous A sound level is less than 60dB, noise is generated by a gas pressure regulating pipeline system in the gas pressure regulating tank, the noise energy is biased to a middle-low frequency band, namely, the noise energy is lower than 1000Hz one third octave, the five surfaces of the inner wall of the gas pressure regulating tank are fully adhered with a third sound absorbing material, and the ground in the tank is fully adhered with a fourth sound absorbing materialWherein the third sound absorbing material comprises artificially synthesized polymer foam material, which comprises at least one of FEF foam, PE foam and epdm foam, pulverizing into 6mm, mixing with glue, and molding to obtain product with density of 180-260kg/m 3 The thickness of the new material is 25-30 mm; the fourth sound absorbing material comprises crushed stone and polyurethane adhesive, and has a density of 1800kg/m 2 The thickness of the sound absorption floor is 35-50mm.
By adopting the technical scheme, the noise energy is lower at the moment, the noise is biased to the middle-low frequency band, and the transmission loss of the noise in the middle-low frequency band in the transmission process is less, so that 180-260kg/m of the third sound absorption material is made of the artificial synthetic polymer foaming material with the particle size of 6mm 3 The sound absorption material of (2) reduces the density, increases the use thickness while improving the void ratio, the use thickness is between 25 and 30mm, and the fourth sound absorption material adopts the density of 1800kg/m 2 The thickness of the sound absorption ground is 35-50mm, so that the absorption path of the middle-low frequency noise is prolonged, and the sound quality can be effectively improved. By adopting the scheme, the subjective evaluation index of the external radiation noise of the gas pressure regulating box is improved, namely, the loudness is changed by more than about 4, the roughness is changed by more than about 0.5, and the annoyance is changed by more than about 10.
Optionally, in step S3, step S33 is further included: when noise is generated by rigid connection between a gas pressure regulating pipeline system and a gas pressure regulating box structure and a pressure regulating pipeline in the gas pressure regulating box, firstly, pasting heavy materials on five surfaces of the inner wall of the gas pressure regulating box, then, according to the frequency distribution of the noise, adopting the steps S31 and S32 to select a first sound absorbing material or a third sound absorbing material to be pasted and installed on the surface of the outer wall surface of the gas pressure regulating box; the heavy material is vinyl heavy rubber, and the density of the heavy material is not less than 2000kg/m 3 The thickness is not less than 2mm.
Through adopting above-mentioned technical scheme, when gas surge tank structure because there is the condition of rigid connection with the interior pressure regulating pipeline of gas surge tank, the route of the propagation of noise is solid propagation and air propagation this moment, at this moment, paste heavy material on the lateral wall of gas surge tank on the basis of first sound absorbing material or second sound absorbing material on the basis of step S31 or step S32, wherein heavy material adopts vinyl heavy rubber, and vinyl heavy rubber is the dense heavy material of homogeneity, and the solid vibration propagation of noise can effectively be blocked to the flexible material of vinyl heavy rubber, on the basis of keeping step S31 or step S32 improvement noise subjective evaluation index, change shake degree about more than 0.3.
Optionally, in step S3, step S34 is further included: when the equivalent continuous A sound level is in the range of 60-70dB, noise is generated by a gas pressure regulating pipeline system in the gas pressure regulating tank, the noise energy is biased to a middle-high frequency band, namely more than 1000Hz one third octave, and a sixth sound absorbing material and an outer protective material are arranged on the outer wall surface of the gas pressure regulating tank in a covering way, wherein the sixth sound absorbing material comprises a light elastic synthetic high molecular foaming material, the light elastic synthetic high molecular foaming material comprises at least one of melamine foam and polyurethane sponge, and the density is 10-50kg/m 3 In the range of 30-40mm in thickness; the outer protective material is a flexible outer protective material for protecting the sixth sound absorbing material, and the sixth sound absorbing material is wrapped when in use.
By adopting the technical scheme, for the gas pressure regulating box with the equivalent continuous A sound level within the range of 60-70dB, the sixth sound absorbing material is wrapped on the outer side of the gas pressure regulating box, is a light elastic artificial synthetic high polymer foaming material and adopts melamine foam and polyurethane sponge, and has good sound absorption property due to the three-dimensional mesh structure of the open holes, so that the sixth sound absorbing material can absorb noise energy generated in the gas pressure regulating box, and the sound quality of the gas pressure regulating box is improved; the outer protective material has good weather resistance, the strength is suitable for outdoor environment and frequent disassembly, the sixth sound absorbing material can be stably wrapped, and the practical life of the sixth sound absorbing material is prolonged. By adopting the scheme, the subjective evaluation index of the external radiation noise of the gas pressure regulating box, namely, the change of the loudness is about 6 or more, the change of the sharpness is about 5 or more, and the change of the annoyance is about 25 or more, can be effectively improved.
Optionally, in step S3, step S35 is further included: when the equivalent continuous A sound level is in the range of 60-70dB, noise is generated by a gas pressure regulating pipeline system in the gas pressure regulating tank, noise energy is biased to a middle-low frequency band, namely, 1000Hz is lower than one third octave, an outer sound-protecting and insulating material is covered on the outer side of the sixth sound-absorbing material, the outer sound-protecting and insulating material is a flexible outer sound-protecting material for protecting the sixth sound-absorbing material, meanwhile, the volume density is not lower than 1600kg/m < 3 >, the use thickness is not lower than 1mm, and the sixth sound-absorbing material is wrapped when in use.
By adopting the technical scheme, the sound absorption and noise reduction of which the noise energy is biased to the middle-low frequency band is realized, and the outer sound insulation material is additionally arranged on the basis of the outer side of the sixth cladding gas pressure regulating box, wherein the volume density of the outer sound insulation material is not lower than 1600kg/m 3 The flexible outer protective material with the thickness not lower than 1mm is used, so that the noise absorption path is further improved on the basis of protecting the sixth sound absorption material, and the sound quality can be effectively improved. By adopting the scheme, the subjective evaluation index of the external radiation noise, namely, the change of the loudness is about 5 or more, the change of the roughness is about 0.7 or more and the change of the annoyance is about 15 or more, can be effectively improved.
Optionally, in step S3, step S36 is further included: when the equivalent continuous a sound level is in the range of 60-70dB for the gas pressure regulating tank and noise is generated by the gas pressure regulating pipeline system itself and rigid connection between the gas pressure regulating tank structure and the pressure regulating pipeline in the gas pressure regulating tank, resulting in the radiation noise of the gas pressure regulating tank becoming a non-negligible part of the external radiation noise, it is necessary to add heavy materials according to the requirements in steps S34 and S35.
By adopting the technical scheme, the number of layers of heavy materials can be selectively added according to the specific size of noise energy, so that the sound quality of the gas pressure regulating box is effectively improved.
Optionally, in step S3, step S37 is further included: when the equivalent continuous A sound level is larger than 70dB, noise is generated by a gas pressure regulating pipeline system in the gas pressure regulating tank, and the combination of the steps S31 and S34 and the combination of the steps S32 and S35 are selected according to the frequency distribution of the noise so as to realize the subjective evaluation index for effectively improving the sound quality of the gas pressure regulating tank.
By adopting the technical scheme, the combination of the steps S31 and S34 and the combination of the steps S32 and S35 are selected to realize the subjective evaluation index for effectively improving the sound quality of the gas pressure regulating box, namely, the loudness is changed by more than about 5, the sharpness is changed by more than about 4, the roughness is changed by more than about 0.7, the shaking degree is changed by more than about 0.3, and the annoyance is changed by more than about 15.
Optionally, in step S3, step S38 is further included: when the equivalent continuous a sound level is greater than 70dB for the gas pressure regulating tank and noise is generated by the gas pressure regulating pipeline system itself and rigid connection between the gas pressure regulating tank structure and the gas pressure regulating pipeline in the gas pressure regulating tank, and the radiation noise of the gas pressure regulating tank becomes a non-negligible part of the external radiation noise, heavy materials need to be added according to the requirements in step S37.
By adopting the technical scheme, the number of layers of heavy materials can be selectively added on the basis of the combination of the steps S31 and S34 and the combination of the steps S32 and S35 according to the specific size of noise energy, so that the sound quality of the gas pressure regulating box is effectively improved.
In summary, the present application includes the following beneficial technical effects:
1. the improvement of the acoustic subjective evaluation indexes of the medium-low pressure gas pressure regulating box with different noise pollution levels is realized by installing materials with different performances and components on the inner wall, the ground and the outer wall of the pressure regulating box;
2. the first sound absorption material adopts FEF foaming, PE foaming and edm foaming, so that the materials are convenient to obtain and put, the sound absorption effect is good, the heat resistance, weather resistance and other ageing resistance are excellent, the service life is long, and the cost performance is high.
Drawings
Fig. 1 is a schematic flow chart of an embodiment of the present application.
Fig. 2 is a flow chart of an optimization process used to embody the acoustic quality of the gas surge tank in an embodiment of the present application.
Detailed Description
The present application is described in further detail below with reference to the accompanying drawings.
The embodiment of the application discloses a method for improving an acoustic subjective evaluation index of a medium-low pressure fuel gas pressure regulating tank. Referring to fig. 1, a method for improving the acoustic subjective evaluation index of a medium-low pressure fuel gas pressure regulating tank comprises the following steps:
s1, acquiring noise data of external radiation of a gas pressure regulating box, manually acquiring noise signals of different gas pressure regulating boxes in a working state, wherein the noise acquisition mode can be performed by adopting microphone and recording equipment or multi-channel acquisition equipment, processing the noise signals to obtain noise samples, classifying the noise according to a main generation source of the noise, wherein the main generation source of the noise according to the gas pressure regulating box can be divided into noise generated by a gas pressure regulating pipeline system in the gas pressure regulating box and noise generated by rigid connection between the gas pressure regulating box structure and a gas pressure regulating pipeline in the gas pressure regulating box;
s2, acquiring subjective evaluation indexes of sound quality of noise data, and acquiring 5 objective acoustic parameters of the sound quality, wherein attribute parameters of the subjective evaluation indexes of the sound quality comprise loudness, roughness, shaking degree, sharpness and vexation degree; specifically, the acquisition of the sound quality may be, but is not limited to, converting the acquired noise sample into a playable ". Wav" sound file by using MATLAB software, or importing the sound file directly acquired by the recording device into the sound quality analysis software HEAD AnalyzerArtemis;
s3, optimizing the sound quality of the gas pressure regulating box, analyzing subjective evaluation indexes of noise data of the gas pressure regulating box, grading the noise energy, and optimizing the structure of the gas pressure regulating box according to different noise emission energies after grading so as to improve the sound quality of the gas pressure regulating box.
Referring to fig. 2, in step S3, step S31 is included: when the equivalent continuous A sound level is smaller than 60dB, noise is mainly generated by a gas pressure regulating pipeline system in the gas pressure regulating box, noise energy is biased to a middle-high frequency band (more than one third octave of 1000 Hz), the five surfaces of the inner wall of the gas pressure regulating box are fully adhered with a first sound absorbing material, and the ground in the box is fully adhered with a second sound absorbing material; the first sound absorbing material is made of artificially synthesized polymer foam material, in this embodiment, three of FEF foam, PE foam and epdm foam are selected as the first sound absorbing material, and FEF foam, PE foam and epdm foam are crushedThe mixture is mixed with glue according to the proportion of 30%, 30% and 40% and the mixture is molded to form the product with the density of 220-300kg/m 3 Is used with a thickness of between 15 and 20 mm; the second sound absorbing material in this embodiment has a composition of broken stone combined with polyurethane adhesive to make a density of 1600kg/m 2 The particle size of the crushed stone is 3mm-5mm (the specific particle size of the crushed stone can be 3mm, 3.25mm, 3.5mm, 3.75mm, 4mm, 4.25mm, 4.5mm, 4.75mm, 5mm or other particle sizes in the range of 3mm-5 mm), and the dust content is less than 0.4 per mill of the total weight, because the particle size of the crushed stone which is available on the market is classified according to the particle size range, the crushed stone with the particle size of 3mm or 5mm is not obtained, the crushed stone with the particle size of all the crushed stone cannot be obtained, the obtained particle size range is just suitable for the embodiment, the embodiment is not limited by the specific particle size value, and the use thickness of the second sound absorbing material is 30-35mm.
Referring to fig. 2, in step S3, step S32 is further included: when the equivalent continuous A sound level is smaller than 60dB, noise is mainly generated by a gas pressure regulating pipeline system in a gas pressure regulating tank, noise energy is biased to a middle-low frequency range (less than 1000Hz one third octave), a third sound absorbing material is fully adhered to five surfaces of the inner wall of the gas pressure regulating tank, a fourth sound absorbing material is fully adhered to the ground in the tank, wherein the third sound absorbing material comprises an artificially synthesized high polymer foaming material, in the embodiment, the artificially synthesized high polymer foaming material comprises three of FEF foaming, PE foaming and epdm foaming, the three artificially synthesized high polymer foaming materials are crushed into particles with the particle size of 6mm, glue is added for remixing after mixing, and the mixture is molded to form the high pressure composite foam with the density of 180-260kg/m 3 The thickness of the new material is 25-30 mm; the fourth sound absorbing material comprises crushed stone and polyurethane adhesive, wherein the particle size of the crushed stone is 3mm-5mm (the specific particle size of the crushed stone can be 3mm, 3.25mm, 3.5mm, 3.75mm, 4mm, 4.25mm, 4.5mm, 4.75mm, 5mm or other particle sizes in the range of 3mm-5 mm), and the dust content is less than 0.4 per mill of the total weight of the marble, because the commercially available crushed stone particle size is classified according to the particle size range, and the marble is notCrushed stone with the particle size of 3mm or 5mm cannot be purchased in a particle size range which is suitable for the embodiment, so that the embodiment is not limited by specific particle size values, the thickness of the second sound absorbing material is 30-35mm, and the density is 1800kg/m 2 The thickness of the sound absorption floor is 35-50mm.
In step S3, step S33 is further included: when noise is generated by rigid connection between a gas pressure regulating pipeline system and a gas pressure regulating box structure and a pressure regulating pipeline in the gas pressure regulating box, and the radiation noise of the gas pressure regulating box becomes a part with non-negligible external radiation noise, firstly, pasting heavy materials on five surfaces of the inner wall of the gas pressure regulating box, and then pasting and installing the first sound absorbing material or the third sound absorbing material in the steps S31 and S32 on the outer surface of the gas pressure regulating box according to the frequency distribution of the noise; when the equivalent continuous A sound level is smaller than 60dB, the noise energy is biased to a middle-high frequency band (more than 1000Hz one third octave), the five surfaces of the inner wall of the gas pressure regulating box are fully pasted with heavy materials, the outer wall surface of the gas pressure regulating box is fully pasted with a first sound absorbing material, and the ground in the gas pressure regulating box is fully pasted with a second sound absorbing material; when the equivalent continuous A sound level is smaller than 60dB, the noise energy is biased to a middle-low frequency band (below 1000Hz one third octave), the five surfaces of the inner wall of the gas pressure regulating box are fully pasted with heavy materials, the outer wall surface of the gas pressure regulating box is fully pasted with a third sound absorbing material, and the ground in the gas pressure regulating box is fully pasted with a fourth sound absorbing material; wherein the heavy material is vinyl heavy rubber, and the weight material is not less than 2000kg/m 3 The thickness is not less than 2mm.
In step S3, step S34 is further included: when the equivalent continuous A sound level is in the range of 60-70dB, noise is mainly generated by a gas pressure regulating pipeline system in the gas pressure regulating tank, noise energy is biased to a middle-high frequency band (more than one third octave of 1000 Hz), and a sixth sound absorbing material and an outer protective material are arranged on the outer wall surface of the gas pressure regulating tank in a covering way, wherein the sixth sound absorbing material comprises a light elastic synthetic high molecular foaming material, and the light elastic synthetic high molecular foaming material comprises melamine foam and polyurethane spongeAt least one of the materials having a density of 10-50kg/m 3 In the range of 30-40mm, the sixth sound absorbing material is not required to be adhered to the box body and is covered on the surface of the box body, and a gap is allowed between the sixth sound absorbing material and the box body; the outer protective material is a flexible outer protective material for protecting the sixth sound absorption material, has good weather resistance, is suitable for outdoor environment and is frequently disassembled, and particularly, the outer protective material is made of fireproof canvas, and the sixth sound absorption material is wrapped when the outer protective material is used.
In step S3, further step S35: when the equivalent continuous A sound level is in the range of 60-70dB, noise is mainly generated by a gas pressure regulating pipeline system in the gas pressure regulating tank, noise energy is biased to a middle-low frequency band (below one third octave of 1000 Hz), and the outer side of the sixth sound absorbing material is covered with an outer sound protecting and insulating material which has good weather resistance and strength suitable for outdoor environment and frequent disassembly; the outer sound-insulating material is a flexible outer sound-insulating material for protecting the sixth sound-absorbing material, specifically, the outer sound-insulating material can be selected from polymer outer sound-insulating materials such as epdm rubber or sea polan rubber, and the density of the outer sound-insulating material is not lower than 1600kg/m 3 The thickness is not less than 1mm, and the sixth sound absorbing material is wrapped when in use.
In step S3, further step S36: when the equivalent continuous A sound level is in the range of 60-70dB, and noise is generated by the gas pressure regulating pipeline system and rigid connection between the gas pressure regulating pipeline structure and the gas pressure regulating pipeline in the gas pressure regulating tank, and the radiation noise of the gas pressure regulating tank becomes a part which is not negligible to external radiation noise, heavy materials are required to be added according to the requirements in the steps S34 and S35, the number of layers of the heavy materials can be selectively added according to the specific size of the noise energy, namely when the noise energy deviates to a medium-high frequency band (more than 1000Hz octaves), the heavy materials are fully attached to five surfaces of the inner wall of the gas pressure regulating tank, and the sixth sound absorbing material and the external protection material are covered and installed on the outer wall surface of the gas pressure regulating tank; when the noise energy is biased to a middle-low frequency range (below 1000Hz one third octave), heavy materials are fully attached to five surfaces of the inner wall of the gas pressure regulating box, and the sixth sound absorbing material and the outer sound protecting and insulating material are arranged on the outer wall surface of the gas pressure regulating box in a covering manner, so that the sound quality of the gas pressure regulating box is effectively improved.
In step S3, further step S37: when the equivalent continuous A sound level is larger than 70dB, noise is mainly generated by a gas pressure regulating pipeline system in the gas pressure regulating tank, and then the combination of the steps S31 and S34 is selected according to the frequency distribution of the noise energy; when the noise energy is biased to a middle-high frequency range (more than 1000Hz one third octave), the five surfaces of the inner wall of the gas pressure regulating box are fully covered with a first sound absorbing material, the ground in the gas pressure regulating box is fully covered with a second sound absorbing material, and the outer wall surface of the box body is covered with a sixth sound absorbing material and an outer protecting material; when the noise energy is biased to a middle-low frequency range (below 1000Hz one third octave), the five surfaces of the inner wall of the gas pressure regulating box are fully pasted with a third sound absorbing material, the ground in the gas pressure regulating box is fully pasted with a fourth sound absorbing material, and the outer wall surface of the gas pressure regulating box is covered and provided with a sixth sound absorbing material and an outer sound protecting and insulating material, so that subjective evaluation indexes for effectively improving the sound quality of the gas pressure regulating box are realized.
In step S3, step S38 is further included: when the equivalent continuous A sound level is greater than 70dB of the gas pressure regulating box and noise is generated by the gas pressure regulating pipeline system and rigid connection between the gas pressure regulating box structure and the pressure regulating pipeline in the gas pressure regulating box, and the radiation noise of the gas pressure regulating box becomes a part with non-negligible external radiation noise, heavy materials are required to be added according to the requirement in the step S37; when the noise energy is biased to a middle-high frequency range (more than 1000Hz one third octave), the five surfaces of the inner wall of the gas pressure regulating box are fully covered with heavy materials, first sound absorbing materials and second sound absorbing materials, the ground in the gas pressure regulating box is fully covered with the second sound absorbing materials, and the outer wall surface of the box body is covered with sixth sound absorbing materials and outer protecting materials; when the noise energy is biased to a middle-low frequency range (below 1000Hz one third octave), the five surfaces of the inner wall of the gas pressure regulating box are fully covered with heavy materials, third sound absorbing materials and fourth sound absorbing materials, the outer wall surface of the gas pressure regulating box is covered with sixth sound absorbing materials and outer sound protecting and insulating materials, and subjective evaluation indexes for effectively improving the sound quality of the gas pressure regulating box are realized.
The implementation principle of the method for improving the acoustic subjective evaluation index of the medium-low pressure gas pressure regulating box in the embodiment of the application is as follows: the noise of different gas pressure regulating boxes is collected, classified and graded, and then different noise reduction methods are adopted in a targeted mode for the gas pressure regulating boxes with different noise pollution characteristics, so that the improvement of the acoustic subjective evaluation indexes of the medium-low pressure gas pressure regulating boxes with different noise pollution levels is realized, and complaints are effectively reduced.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (1)
1. A method for improving the acoustic subjective evaluation index of a medium-low pressure gas pressure regulating box is characterized by comprising the following steps of: the method comprises the following steps:
s1, acquiring noise data of external radiation of a gas pressure regulating box, manually acquiring a noise signal of the gas pressure regulating box in a working state, processing the noise signal to obtain a noise sample, and classifying the noise according to a main generation source of the noise, wherein the main generation source of the noise is divided into noise generated by a gas pressure regulating pipeline system in the gas pressure regulating box, and the noise is generated by rigid connection among the gas pressure regulating pipeline system and a gas pressure regulating box structure and a pressure regulating pipeline in the gas pressure regulating box;
s2, acquiring subjective evaluation indexes of noise data sound quality, wherein attribute parameters of the subjective evaluation indexes of the sound quality comprise loudness, roughness, shaking degree, sharpness and annoyance;
s3, optimizing the sound quality of the gas pressure regulating box, analyzing subjective evaluation indexes of noise data of the gas pressure regulating box, grading the noise energy, and optimizing the structure of the gas pressure regulating box according to different noise emission energies after grading so as to improve the sound quality of the gas pressure regulating box;
step S3 includes step S31: when the equivalent continuous A sound level is less than 60dB, noise is mainly generated by a gas pressure regulating pipeline system inside the gas pressure regulating box, and the noise energy is biased to medium and high frequenciesThe section, namely, more than one third octave of 1000Hz, is that five surfaces of the inner wall of the gas pressure regulating box are fully adhered with a first sound absorbing material and the ground in the box is fully adhered with a second sound absorbing material, the first sound absorbing material is crushed into 2mm, 3mm and 4mm sizes by using an artificial synthetic polymer foaming material, glue is added according to the proportion of 30%, 30% and 40%, and the density is 220-300kg/m by adopting a mould pressing mode 3 The thickness of the new material is 15-20 mm; the second sound absorbing material is composed of broken stone combined with polyurethane adhesive and has a density of 1600kg/m 2 The thickness of the sound absorption ground is 30-35mm;
the first sound absorbing material comprises at least one of FEF foaming, PE foaming and edm foaming;
in step S3, further step S32: when the equivalent continuous A sound level is less than 60dB, noise is generated by a gas pressure regulating pipeline system in the gas pressure regulating tank, the noise energy is biased to a middle-low frequency range, namely, the frequency is lower than 1000Hz by one third octave, a third sound absorbing material is fully adhered to five surfaces of the inner wall of the gas pressure regulating tank, and a fourth sound absorbing material is fully adhered to the ground in the tank, wherein the third sound absorbing material comprises an artificially synthesized polymer foaming material, the artificially synthesized polymer foaming material comprises at least one of FEF foaming, PE foaming and edm foaming, the artificially synthesized polymer foaming material is crushed into a size of 6mm, glue is mixed and added, and the density is 180-260kg/m by adopting a mould pressing mode 3 The thickness of the new material is 25-30 mm; the fourth sound absorbing material comprises crushed stone and polyurethane adhesive, and has a density of 1800kg/m 2 The thickness of the sound absorption ground is 35-50mm;
in step S3, step S33 is further included: when noise is generated by rigid connection between a gas pressure regulating pipeline system and a gas pressure regulating box structure and a pressure regulating pipeline in the gas pressure regulating box, firstly, pasting heavy materials on five surfaces of the inner wall of the gas pressure regulating box, then, according to the frequency distribution of the noise, adopting the steps S31 and S32 to select a first sound absorbing material or a third sound absorbing material to be pasted and installed on the surface of the outer wall surface of the gas pressure regulating box; the heavy material is vinyl heavy rubber, and the density of the heavy material is not less than 2000kg/m 3 The thickness is not less than 2mm;
in the step S3 of the process,further comprising step S34: when the equivalent continuous A sound level is in the range of 60-70dB, noise is generated by a gas pressure regulating pipeline system in the gas pressure regulating tank, the noise energy is biased to a middle-high frequency band, namely more than 1000Hz one third octave, and a sixth sound absorbing material and an outer protective material are arranged on the outer wall surface of the gas pressure regulating tank in a covering way, wherein the sixth sound absorbing material comprises a light elastic synthetic high molecular foaming material, the light elastic synthetic high molecular foaming material comprises at least one of melamine foam and polyurethane sponge, and the density is 10-50kg/m 3 In the range of 30-40mm in thickness; the outer protective material is a flexible outer protective material for protecting the sixth sound absorbing material, and the sixth sound absorbing material is wrapped when in use;
in step S3, further step S35: when the equivalent continuous A sound level is in the range of 60-70dB, noise is generated by a gas pressure regulating pipeline system in the gas pressure regulating tank, noise energy is biased to a middle-low frequency band, namely, 1000Hz is lower than one third octave, an outer sound protection and insulation material is covered on the outer side of a sixth sound absorption material, the outer sound protection and insulation material is a flexible outer protection material for protecting the sixth sound absorption material, and meanwhile, the volume density is not lower than 1600kg/m 3 The thickness is not less than 1mm, and the sixth sound absorption material is wrapped when in use;
in step S3, further step S36: when the equivalent continuous A sound level is in the range of 60-70dB, and noise is generated by the gas pressure regulating pipeline system and rigid connection between the gas pressure regulating pipeline structure and the gas pressure regulating pipeline in the gas pressure regulating tank, so that the radiation noise of the gas pressure regulating tank becomes a part with non-negligible external radiation noise, heavy materials are required to be added according to the requirements in the steps S34 and S35;
in step S3, further step S37: when the equivalent continuous A sound level is larger than 70dB, noise is generated by a gas pressure regulating pipeline system in the gas pressure regulating tank, and according to the frequency distribution of the noise, the combination of the steps S31 and S34 and the combination of the steps S32 and S35 are selected to realize the subjective evaluation index for effectively improving the sound quality of the gas pressure regulating tank;
in step S3, step S38 is further included: when the equivalent continuous a sound level is greater than 70dB for the gas pressure regulating tank and noise is generated by the gas pressure regulating pipeline system itself and rigid connection between the gas pressure regulating tank structure and the gas pressure regulating pipeline in the gas pressure regulating tank, and the radiation noise of the gas pressure regulating tank becomes a non-negligible part of the external radiation noise, heavy materials need to be added according to the requirements in step S37.
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