Acoustic absorption coefficients (II)

For certain types of rooms used to be occupied by a large number of people in its design question arises how will its acoustic behavior in different conditions for optimal occupancy of the same design.

It is necessary to estimate the sound absorption provided by people and furniture from the corresponding sound absorption coefficients.

 

We complete the table acoustic absorption coefficients publishedwith the following table:

Materials	Coefficients
	125Hz	250Hz	500Hz	1000Hz	2000Hz	4000Hz
Area of empty chairs with upholstered high percentage of surface	0.72	0.79	0.83	0.84	0.83	0.79
Area of empty chairs with upholstered surface average percentage	0.56	0.64	0.70	0.72	0.68	0.62
Area of empty chairs with upholstered surface low percentage	0.35	0.45	0.57	0.61	0.59	0.55
Area occupied chairs with upholstered high percentage of surface	0.76	0.83	0.88	0.91	0.91	0.89
Area occupied chairs with upholstered surface average percentage	0.68	0.75	0.82	0.85	0.85	0.86
Area occupied chairs with upholstered surface low percentage	0.56	0.68	0.79	0.83	0.83	0.86
Wooden seat	0.01	0.02	0.03	0.04	0.06	0.08
Wooden seat occupied	0.34	0.39	0.44	0.54	0.56	0.56
Seat upholstered with leather or vinyl	0.10	0.15	0.25	0.25	0.25	0.25
Seat upholstered with plastic	0.20	0.20	0.25	0.30	0.30	0.30
Seat upholstered with velvet	0.30	0.32	0.27	0.30	0.33	0.33
Group of people standing	0.25	0.44	0.59	0.56	0.62	0.50