WHAT IS THE ACTUAL INFLUENCE OF A NANO-FIBROUS MEMBRANE ON THE ACOUSTICAL PROPERTY OF POROUS SUBSTRATE?

摘要

There is a general lack of publications on the acoustical and related non-acoustical properties of nano-fibrous media. Existing publications typically present scanning electron microscope images of these media together with the acoustic absorption coefficient or transmission loss data (e.g. [1,2]). These works often discuss the nano-fibre production process, quote data on the fibre diameter and surface density for nano-fibrous membranes produced as a result of the reported process. However, little or no information is usually presented on the material pore structure, membrane thickness or bulk density. No effort is made to explain the observed acoustical performance of nano-fibrous membranes using a valid theoretical or semi-empirical model [1,2].