Numerical Methods for Calculating Noise in Disproportionate Rooms of Civil Buildings

In civil buildings of various purposes there are a large number of rooms with large dimensions. Most of them have disproportionately proportioned volumes. They, as a rule, according to the available classification, belong to long or flat rooms, the distribution of sound energy in which has its own characteristic features. The distribution of sound energy in such rooms is largely influenced by the nature of the reflection of sound from fences. It is established that in most cases the sound reflection in disproportionate rooms has a mirror-diffuse character. With such reflection in rooms, in addition to direct sound, a reflected sound field is formed, the energy characteristics of which are determined by the mirror and diffuse components of this field. For this reason, combined calculation models should be used to calculate the reflected sound energy, in which different calculation methods should be used to determine the energy characteristics of the mirror and diffuse components of the reflected field. The article analyzes the combined calculation methods developed by the authors, used to assess the noise regime in disproportionate rooms with a mirror-diffuse nature of sound reflection from fences. Based on the analysis of the developed methods, it was found that the most acceptable for practical calculations is the combined calculation method, in which the mirror component is determined by the ray tracing method, and the diffusely scattered energy is determined by the numerical statistical energy method. To implement it, a computer program has now been developed that allows calculations to be made in disproportionate rooms of any complex shape.

A.I. ANTONOV^1,2, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
V.P. GUSEV¹, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
V.I. LEDENEV^1,2, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
I.V. MATVEEVA², Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
M.A. POROZHENKO¹, Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ Scientific-Research Institute of Building Physics of RAACS (21, Lokomotivniy Driveway, Moscow, 127238, Russian Federation)
² Tambov State Technical University (106, Sovetskaya st., Tambov, 392000, Russian Federation)

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