CN113849994A - Indoor secondary radiation noise prediction method and model caused by fixed equipment - Google Patents

Indoor secondary radiation noise prediction method and model caused by fixed equipment Download PDF

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CN113849994A
CN113849994A CN202111067302.7A CN202111067302A CN113849994A CN 113849994 A CN113849994 A CN 113849994A CN 202111067302 A CN202111067302 A CN 202111067302A CN 113849994 A CN113849994 A CN 113849994A
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卢铃
翟国庆
谢紫银
曹浩
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Electric Power Research Institute of State Grid Hunan Electric Power Co Ltd
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Abstract

The invention discloses a method and a model for predicting indoor secondary radiation noise caused by fixed equipment, belonging to the field of noise prediction, wherein the method comprises the steps of introducing a building vibration response finite element model caused by the fixed equipment, establishing a building acoustic boundary element model by adopting an Acoustics acoustic module in LMS virtual. Setting material parameters of a sound propagation medium (air) in the building acoustic boundary meta-model; extracting a result file of the building vibration response finite element model, converting acceleration time domain data of vibration response in the file into frequency domain data by utilizing fast Fourier transform, and mapping the frequency domain data to an acoustic boundary element grid; and setting a secondary radiation noise prediction point at a position 1.2m higher from the ground of each floor as an output site. The model comprises a building indoor secondary radiation noise single value prediction model and a frequency division prediction model. The whole prediction method and model are simple and convenient.

Description

Indoor secondary radiation noise prediction method and model caused by fixed equipment
Technical Field
The invention relates to the field of noise prediction, in particular to a method and a model for predicting indoor secondary radiation noise caused by fixed equipment.
Background
With the rapid development of economic society, the living standard of people is increasing day by day, and the requirements for living environment are also continuously increased. Sound and vibration are one of the main factors influencing indoor environment, and when vibration sources (such as air conditioning equipment, a transformer, an elevator tractor and other fixed equipment) in a building run, the vibration is transmitted to a building structure through a base, so that indoor secondary radiation noise pollution is caused, and noise disturbing accidents and complaint events are increased year by year. In order to meet the increasing demand of good life of people and construct a harmonious living environment, the prediction of indoor secondary radiation noise caused by fixed equipment in a building needs to be researched, a model capable of predicting the secondary radiation noise is developed, and a basis is provided for the prediction of the indoor secondary radiation noise caused by the fixed equipment.
Disclosure of Invention
The invention aims to provide a method for predicting indoor secondary radiation noise caused by fixed equipment, which can calculate the indoor secondary radiation noise caused by the fixed equipment in a building.
The invention also aims to provide a prediction model of indoor secondary radiation noise caused by fixed equipment, which is realized by utilizing the prediction method of indoor secondary radiation noise caused by fixed equipment and can predict indoor secondary radiation noise of different floors caused by fixed equipment in a building.
In order to achieve the above object, the present invention provides a method for predicting indoor secondary radiation noise caused by a fixed device, comprising the following steps:
(1) introducing a building vibration response finite element model caused by fixed equipment, establishing a building acoustic boundary element model by adopting an Acoustics acoustic module in LMS virtual.
(2) Setting material parameters of a sound propagation medium (air) in the building acoustic boundary meta-model;
(3) extracting a result file of the building vibration response finite element model, converting acceleration time domain data of vibration response in the file into frequency domain data by utilizing fast Fourier transform, and mapping the data to an acoustic boundary element grid by using a maximum distance method;
(4) and setting a secondary radiation noise prediction point at a position 1.2m higher from the ground of each floor as an output site.
Preferably, in the step (1), in the building vibration response finite element model, a building room where the secondary radiation noise prediction point is located is a closed cavity structure, a surface mesh of the room structure is directly extracted as a boundary element mesh, and the boundary element mesh is introduced into LMS virtual.
In order to achieve the other object, the indoor secondary radiation noise prediction model caused by the fixed equipment provided by the invention is realized based on the indoor secondary radiation noise prediction method caused by the fixed equipment, and comprises a building indoor secondary radiation noise single-value prediction model and a frequency division prediction model.
In the above technical solution, the indoor secondary radiation noise single value prediction model caused by the fixed equipment has a calculation formula as follows:
LAeq,n＝LAeq，1+ΔLAeq,n
Figure RE-GDA0003377734190000021
in the formula, LAeq,nEquivalent continuous A sound level of indoor secondary radiation noise of the nth floor of the building; Δ LAeq,nIs LAeq,nAnd LAeq,1The difference between the values. L isp，iSound pressure level, dB, for the ith octave band; cf,iThe correction value, dB, is weighted for the ith octave band a.
The indoor secondary radiation noise frequency division prediction model caused by the fixed equipment has the following calculation formula:
LAeq,i＝Laeq, i, building 1 floor-ΔLAeq,i
In the formula, LAeq,iFor building L on the ith octave at the central point of a certain floorAeq，dB； LAeq, i, building 1 floorFor building L on ith octave at one floor center pointAeq，dB；ΔLAeq,iFor the central point of a certain floor to be relative to the central point of a floor of the building on the ith octaveAeqIn dB.
Preferably, in the indoor secondary radiation noise single value and frequency division prediction model caused by the fixed equipment, the fixed equipment is arranged on the negative floor of the building.
Compared with the prior art, the invention has the beneficial effects that:
(1) the method for predicting the indoor secondary radiation noise caused by the fixed equipment can predict the indoor secondary radiation noise more simply, conveniently and quickly.
(2) The indoor secondary radiation noise single value prediction model caused by the fixed equipment can predict indoor secondary radiation noise of different floors of a building more quickly.
(3) The indoor secondary radiation noise frequency division prediction model caused by the fixed equipment considers the frequency spectrum characteristic of the secondary radiation noise, can better represent the attenuation characteristic of the secondary radiation noise on specific frequency, and further improves the prediction accuracy on the basis of a single-value prediction model.
Drawings
Fig. 1 is a schematic flow chart of a method for predicting indoor secondary radiation noise caused by a distribution transformer according to an embodiment of the present invention;
fig. 2 is a difference value of equivalent continuous a sound levels of indoor secondary radiation noise of an nth layer and an indoor secondary radiation noise of a first layer in an indoor secondary radiation noise single value prediction model caused by a distribution transformer according to an embodiment of the present invention;
fig. 3 is an attenuation amount of an equivalent continuous a sound level in an ith octave of a central point of a floor of a multi-story building (8 floors) relative to a central point of a floor in an indoor secondary radiation noise frequency division prediction model caused by a distribution transformer according to an embodiment of the present invention;
fig. 4 is an attenuation amount of an equivalent continuous a sound level in an ith octave of a floor center point of a high-rise building (20 floors) relative to a floor center point in an indoor secondary radiation noise frequency division prediction model caused by a distribution transformer according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the following embodiments and accompanying drawings.
Examples
Taking a distribution transformer (fixed equipment) which is arranged in a building with a negative layer in a multi-layer (8-layer) or high-rise (20-layer) building with a frame and shear walls as an example, when the distribution transformer runs, vibration is transmitted to a building structure through a base, and indoor secondary radiation noise pollution is caused. Therefore, the method of the embodiment is adopted to predict indoor secondary radiation noise of different floors caused by distribution transformers in frames, shear walls and high-rise buildings, and a corresponding prediction model is established.
Referring to fig. 1, the method for predicting indoor secondary radiation noise caused by a distribution transformer in a frame, a shear wall, a multi-story building and a high-rise building of the embodiment includes the following steps:
(1) introducing a frame, shear wall multi-layer and high-rise building vibration response finite element model caused by a distribution transformer, establishing a building acoustic boundary element model by adopting an Acoustics module in LMS virtual.
(2) Setting material parameters of a sound propagation medium (air) in the building acoustic boundary meta-model;
(3) extracting a result file of the building vibration response finite element model, converting acceleration time domain data of vibration response in the file into frequency domain data by utilizing fast Fourier transform, and mapping the data to an acoustic boundary element grid by using a maximum distance method;
(4) and setting a secondary radiation noise prediction point at a position 1.2m higher from the ground of each floor as an output site.
In order to further optimize the above technical scheme, in the building vibration response finite element model in step (1), a building room where a secondary radiation noise prediction point is located is a closed cavity structure, a surface mesh of the room structure is directly extracted as a boundary element mesh, and the boundary element mesh is introduced into LMS visual.
The material parameters in the step (2) are as follows: the propagation speed of sound in the air is 340m/s2Air density of 1.23kg/m3Acoustic impedance of 417kg · s/m2。
Based on the simulation result obtained by the prediction method, an indoor secondary radiation noise single value prediction model caused by the distribution transformer in the frame, the shear wall and the high-rise building is established, and the calculation formula is as follows:
LAeq,n＝LAeq，1+ΔLAeq,n
Figure RE-GDA0003377734190000051
in the formula, LAeq,nEquivalent continuous A sound levels of secondary radiation noise in the nth floor of the high-rise building are obtained by the method; Δ LAeq,nIs LAeq,nAnd LAeq,1The difference between the values. L isp，iSound pressure level, dB, for the ith octave band; cf,iThe correction value, dB, is weighted for the ith octave band a. Wherein Δ LAeq,nValues are taken as shown in figure 2.
The indoor secondary radiation noise frequency division prediction model caused by the distribution transformer in the frame, the shear wall and the multi-storey high-rise building is provided. The calculation formula is as follows:
LAeq,i＝Laeq, i, building 1 floor-ΔLAeq,i
In the formula, LAeq,iIs L on the ith octave at the central point of a certain floor of a frame, a plurality of layers of shear walls and a high-rise buildingAeq，dB；LAeq, i, building 1 floorFor building L on ith octave at one floor center pointAeq，dB；ΔLAeq,iFor the central point of a certain floor to be relative to the central point of a floor of the building on the ith octaveAeqAttenuation ofAmount, dB. The values are shown in fig. 3 and 4.
The above description is only exemplary of the preferred embodiments of the present invention, and is not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. The method for predicting the indoor secondary radiation noise caused by the fixed equipment is characterized by comprising the following steps of:
(1) introducing a building vibration response finite element model caused by fixed equipment, establishing a building acoustic boundary element model by adopting an Acoustics acoustic module in LMS virtual.
(2) Setting material parameters of a sound transmission medium in the building acoustic boundary meta-model;
(3) extracting a result file of the building vibration response finite element model, converting acceleration time domain data of vibration response in the file into frequency domain data by utilizing fast Fourier transform, and mapping the data to an acoustic boundary element grid by using a maximum distance method;
(4) and setting a secondary radiation noise prediction point at a position 1.2m higher from the ground of each floor as an output site.
2. The method for predicting indoor secondary radiation noise caused by fixed equipment according to claim 1, wherein in the step (1), in the building vibration response finite element model, a building room where a secondary radiation noise prediction point is located is a closed cavity structure, a surface mesh of the room structure is directly extracted as a boundary element mesh, and the boundary element mesh is introduced into LMS virtual.
3. Indoor secondary radiation noise prediction model caused by fixed equipment, which is realized based on the indoor secondary radiation noise prediction method caused by fixed equipment in claim 1 or 2, is characterized by comprising a building indoor secondary radiation noise single-value prediction model and a frequency division prediction model.
4. The stationary equipment-induced indoor secondary radiation noise single-valued prediction model according to claim 3, is characterized in that the calculation formula is as follows:
LAeq,n＝LAeq，1+ΔLAeq,n
Figure FDA0003258963650000021
in the formula, LAeq,nEquivalent continuous A sound level of indoor secondary radiation noise of the nth floor of the building; Δ LAeq,nIs LAeq,nAnd LAeq,1The difference between the values. L isp，iSound pressure level, dB, for the ith octave band; cf,iThe correction value, dB, is weighted for the ith octave band a.
5. The fixed equipment induced indoor secondary radiation noise frequency division prediction model according to claim 3, characterized in that the calculation formula is as follows:
LAeq,i＝Laeq, i, building 1 floor-ΔLAeq,i
In the formula, LAeq,iFor building L on the ith octave at the central point of a certain floorAeq，dB；LAeq, i, building 1 floorFor building L on ith octave at one floor center pointAeq，dB；ΔLAeq,iFor the central point of a certain floor to be relative to the central point of a floor of the building on the ith octaveAeqIn dB.
6. The fixed-equipment induced indoor secondary radiation noise single-valued and frequency-division prediction model according to claim 4 or 5, characterized in that the fixed equipment is placed in the minus floor of a building.
CN202111067302.7A 2021-09-13 2021-09-13 Indoor secondary radiation noise prediction method and model caused by fixed equipment Pending CN113849994A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116400627A (en) * 2023-04-13 2023-07-07 深圳市丰源升科技有限公司 Industrial remote control system and method based on 5G

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116400627A (en) * 2023-04-13 2023-07-07 深圳市丰源升科技有限公司 Industrial remote control system and method based on 5G

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