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
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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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