Investigations on Sound Absorption Properties of Perforated Designed Panels for the Selective Frequency Absorption

Due to rapid industrialization and urbanization, noise pollution emerges as one of the serious threats to human beings. Noise is countered by sound-absorbing materials in the buildings and other places. In this study sound absorption properties of pinewood-based high-density fiberboard (HDF) perforated ceiling panels have been investigated. Perforated panels have been selected because they can counter the noise in specific low frequency ranges. The panels of different specific drilled hole sizes and perforation ratios have been studied to see the influence of these parameters on sound absorption characteristics. Further, an attempt has been done to enhance the sound absorption bandwidth by inserting a porous material behind the perforated panels. The experiments for the measurement of sound absorption coefficients (alpha) have been done by the Reverberation Chamber method as per ISO 8285-1987. The main aim of this study is to optimize different parameters and design a structure for the ceiling panel that can provide an efficient, economical noise reduction solution for confidential speech privacy by reducing echoes and long reverberation inside rooms.