Journal
MATERIALS
Volume 13, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/ma13051091
Keywords
sound absorption; perforated plates with extended tubes; porous materials; periodic absorber
Categories
Funding
- State Grid Corporation of China: Audible noise characteristics of electrical equipment and noise control on the boundary of converter stations in +/-800 kV HVDC transmission systems
- National Natural Science Foundation of China [11374326]
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The diffuse sound absorption was investigated theoretically and experimentally for a periodically arranged sound absorber composed of perforated plates with extended tubes (PPETs) and porous materials. The calculation formulae related to the boundary condition are derived for the periodic absorbers, and then the equations are solved numerically. The influences of the incidence and azimuthal angle, and the period of absorber arrangement are investigated on the sound absorption. The sound-absorption coefficients are tested in a standard reverberation room for a periodic absorber composed of units of three parallel-arranged PPETs and porous material. The measured 1/3-octave band sound-absorption coefficients agree well with the theoretical prediction. Both theoretical and measured results suggest that the periodic PPET absorbers have good sound-absorption performance in the low- to mid-frequency range in diffuse field.
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