FIELD: metrology.
SUBSTANCE: stand for acoustic testing of noise-absorbing panels contains a test chamber, the walls of which are lined with the investigated noise-absorbing lining in the form of noise-absorbing panels. Noise source is located on the floating floor, under which the vibration dampening panel is mounted, and the measurement points are fixed on the measuring surface S, m2, which is a spherical surface. Sound power level Lp are determined from the results of measurements of the average sound pressure level Lcp on the measuring surface S, m2, for which the area of the hemisphere is accepted: 
, where S=2πr2; r – distance from the source center to the measurement points; S0= 1 m2, and the corrected sound power level LpA:
, where LAcp - the average sound level on the measuring surface. Amount of sound pressure level reduction ΔL in the reflected sound field of a sample of a combined noise-absorbing lining with resonant elements is calculated according to the known formula.
EFFECT: technical result is expansion of technological capabilities of testing facilities.
1 cl, 3 dwg
