Assessment of the Acoustic Absorption Characteristics of Layered Composite Structures Obtained from Plates with Lignocellulosic Coatings (I)

Ion Durbaca,Nicoleta Sporea,Ovidiu Vasile

doi:10.37358/mp.20.2.5345

Abstract

Abstract.The paper aims to present research on the determination of the coefficient of acoustic absorption as a function of frequency, for composite monolayer plates (made of: MDF - wooden dried agglomerated fibres with medium density, RWB - rebated wood from dried beech, PS - extruded polystyrene) and multilayer (with outer coatings of: MDF, RWB and polymeric core of extruded polystyrene). The sound-absorbing behavior of such plates is highlighted in the cabins made of multilayer structures.

Highlights

Acoustic pollution represents an important component of environment pollution due to its noxious and disturbing character for the entire humanity and for other beings in the nature.the primary objectives of current scientific research on combating noise pollution are focused on the following strategic directions of action [1]:- identifying potential sources of noise and of causes of noise pollution; - development of new composite materials with high sound-absorbing properties; - implementation of innovative technical solutions to prevent and reduce the effects of acoustic pollution
Considering as the priority direction of research of the development of new composite materials with high sound-absorbing properties, the present paper addresses the comparative determination of the sound-absorbing capacity of two composite structures stratified with outer coatings of different ligno-cellulose nature and extruded polymeric core
In the case of these tested materials, it is considered that it was obtained a good sound absorption capacity if the value of the medium sound absorption coefficient tends to 1, and the absorption percentage at this value should be mentained on a large frequency interval

Summary

Introduction

Acoustic pollution represents an important component of environment pollution due to its noxious and disturbing character for the entire humanity and for other beings in the nature.the primary objectives of current scientific research on combating noise pollution are focused on the following strategic directions of action [1]:- identifying potential sources of noise and of causes of noise pollution; - development of new composite materials with high sound-absorbing properties; - implementation of innovative technical solutions to prevent and reduce the effects of acoustic pollution (for example: sound insulation, acoustic correction, individual protection measures etc). In the specialized literature there are numerous studies regarding the determination of the acoustic characteristics of composite materials, using different research and investigation methods [3 - 12]. Considering as the priority direction of research of the development of new composite materials with high sound-absorbing properties, the present paper addresses the comparative determination of the sound-absorbing capacity of two composite structures stratified with outer coatings of different ligno-cellulose nature and extruded polymeric core. For this purpose, the experimental determination of the acoustic absorption coefficient for the materials used is considered

Methods

Results

Conclusion