FIELD: metrology.
SUBSTANCE: invention relates to metrology, in particular, to stands for assessing the quality of sound absorbers. Stand contains a metal case, the walls of which are lined with the sound absorber under study, on the bottom of the body through the elastic damping gasket the adjustable noise source is installed, where the adjustment is carried out according to the loudness of the sound and the signal frequency using the signal strength amplifier and the oscilloscope, and at a distance of 1 m from the housing cover a microphone is fixed, the signals of sound pressure levels from which are fed to a frequency spectrum analyzer, and then to a computer for processing the received information. Then, the sound power level is determined, the corrected sound power level, the magnitude of the sound pressure level reduction, the average sound absorption coefficient of the acoustically treated room, the value of the total incremental absorption are found. In the study of the ceiling, the sound absorber is removed from the side walls of the metal housing, and the effective part of the adjustable noise source is directed to the ceiling part of the housing and switched on, sequentially changing the sound volume and frequency of the signal. In the study of wall cladding, the sound absorber is removed from the ceiling, and the wall cladding is applied to the walls. Source of the noise is directed to the walls. Then from the microphone, signals are sent to a power amplifier, for example, a strain gauge, and from there signals are sent to an oscilloscope and oscillograms of sound pressure levels are recorded, which determine the effectiveness of the acoustic ceiling.
EFFECT: expansion of technological possibilities for testing objects having several elastic connections with body parts.
1 cl, 3 dwg
