RESEARCH OF SOUND INSULATION OF MULTILAYERED INTERFLOOR OVERLAPPINGS

Abstract

Sound insulation of the multilayered interfloor overlappings is considered. It possesses the best technical and economic indicators than traditional overlappings with floors on elastic laying. Theoretical researches of isolation of shock noise are executed. It is established that in the low frequency region multilayer overlaps have high sound insulation properties and lead to a decrease in the level of shock noise by about 24 dB at each frequency doubling. The lowest value of shock noise isolation is achieved in the frequency bands corresponding to the second frequency of the floor eigenfrequencies. In the mid-to high-frequency region, the increase in additional shock noise isolation under multi-layer overlap slows down to 12 dB per octave. The experimental inspection of the received conclusions is carried out. The comparison of calculated and measured frequency characteristics of the impact noise reduction showed a good agreement between the results of theoretical and experimental studies. It is shown that at the same surface density multilayer structures of overlappings better isolate shock and air noise than traditional structures of floors with elastic pads.