NOISE-ABSORBING ACOUSTIC SCREEN BASED ON A HELMHOLTZ RESONATOR

Abstract

The paper aims at studying the noise protection potential of an acoustic screen based on a Helmholtz resonator to solve the
problem of noise reduction level in the area in front of the screen. For experimental analysis, a modular acoustic screen has been made. Replaceable modules are made on the basis of a wooden frame with stiffening ribs, one side of the module is blind, another has slotted holes, which ensures the formation of noise absorbers on a Helmholtz resonator principle. Changing the position of the modules in the support racks provides the ability to change the screen reflexive surface nature. The main problem solved in this work is to experimentally determine the decrease magnitude in the sound pressure level in the area in front of the screen. The results of sound pressure level measurements at various frequencies are provided, the comparison of the reflected noise obtained values with the results obtained in the sound pressure level analysis in the case of a solid screen is given. The coincidence of the calculated values of the active sound absorption frequencies with the measured values is shown. It is concluded that there is a possibility to solve the nose reduction level problem when using such screens in areas where people can be.