Outdoor sound prediction method based on construction group density

A prediction method and building technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of large amount of calculation, outdoor sound without calculating the impact of ground reflection sound, gap, etc., to improve accuracy and solve problems Noise attenuation calculation computationally expensive effect

Active Publication Date: 2014-11-26
GUANGDONG FUNDWAY TECH
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AI Technical Summary

Problems solved by technology

Some three-dimensional calculation methods of outdoor sound solve the problem of noise attenuation between building groups in some cases, but for some cases, especially the attenuation between large-scale irregular building groups, there is a problem of heavy calculation. Especially when there are other interference factors, there is a huge gap between the calculation results of the attenuation and the actual results, and effective data cannot be obtained, which has a major impact on research and environmental assessment, etc.
Moreover, in the existing calculation method of outdoor sound, the attenuation of outdoor sound does not calculate the impact of ground reflection sound on the attenuation of outdoor sound.

Method used

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  • Outdoor sound prediction method based on construction group density
  • Outdoor sound prediction method based on construction group density
  • Outdoor sound prediction method based on construction group density

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Effect test

Embodiment 1

[0043] The invention is suitable for sound attenuation of point sound sources. For line sound sources such as road traffic noise, it will be discretized to form a series of point sound sources. These point sound sources are represented by a group of partitions, and each partition represents a discrete point sound source. The sound power and directivity characteristics of the sound power, the attenuation calculated by the sound of a representative point in each partition is used to represent the sound attenuation of this partition, and each partition is represented by a point sound source at the center.

[0044] When one or both of the sound source and the receiving point are located between building groups, the building will have reflection and diffraction effects on the propagation of the noise. Considering the actual propagation of the sound will bring a large amount of calculation, the present invention then Based on the ISO standard algorithm, two parameters are proposed: ...

Embodiment 2

[0055] The propagation process of road traffic noise is not the full-space spherical diffusion of sound energy. In reality, the ground will absorb and reflect the propagation of sound. This algorithm needs to be modified when considering the presence of ground influences.

[0056] Reflect the ground attenuation A by introducing the influence parameter r of the ground on the attenuation of building groups hous Impact. Then the building group attenuation algorithm after adding the ground is:

[0057] A hous,g =A hous (1-r)

[0058] In practice, the difference in the acoustic properties of the ground will make r very different. For r there are the following discussions:

[0059] 1) If the ground can absorb all the arriving sound, it is obvious that the receiving point is not compensated by the reflected sound from the ground, and the ground faces attenuation A hous No effect, r is zero at this time.

[0060] 2) if figure 2 As shown, if the ground can mirror the arriving...

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Abstract

The invention provides an outdoor sound prediction method based on construction group density. By considering the shielding attenuation and the reflective compensations of a construction group to sound and by taking the ratio of construction volume to space volume as a variable, the attenuation of road traffic noise is measured. According to the outdoor sound prediction method based on the construction group density, the decisive influences of the front row of constructions near a road on the attenuation of the sound are calculated, and the ratio accounted by the projected area of the front row of constructions on the vertical plane on which the road is located is also considered. Moreover, the influences of ground reflection and absorption in the sound propagation process on attenuation terms are corrected by an algorithm to obtain a general form of the sound attenuation of the three-dimensional construction group. The outdoor sound prediction method based on the construction group density is applied to the construction group to calculate the noise attenuation of outdoor sound, and thereby, the problem that the amount of calculation on the noise attenuation of a large zone of the high-density construction is high is solved.

Description

technical field [0001] The invention belongs to the technical field of outdoor sound emission and propagation and space geometry, and in particular relates to an outdoor sound prediction method based on building group density. Background technique [0002] Now in the field of research, environmental assessment and municipal planning, etc., especially in road construction, the surrounding environment will be assessed first, and the impact of road construction on the surrounding environment will be assessed through various methods. Through the assessment results, real-time Adjusting the progress of the project and taking effective measures to protect the surrounding environment, especially the impact of noise on the surrounding environment is the focus of the entire road construction project, so how to minimize the impact of noise and other factors on the surrounding environment through planning and construction It is very important, and what has an important impact on this is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 蔡铭王海波余志
Owner GUANGDONG FUNDWAY TECH
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