Seminar - How many parameters do we really need to predict the acoustical properties of porous media accurately? by Prof. Kirill V Horoshenkov
日期：2019 年 01 月 17 日 ( 星期四)
Time：11:00 am – 12:00 pm
Modelling of sound propagation in porous media requires the knowledge of several intrinsic material parameters, some of which are difficult or impossible to measure directly, particularly in the case of a porous medium which is composed of pores with a wide range of scales and random interconnections. Five particular parameters which are rarely measured non-acoustically, but used extensively in a number of acoustical models, are the tortuosity, viscous and thermal characteristic lengths, thermal permeability, and Pride parameter. The main purpose of this talk is to show how these parameters relate to the pore size distribution which is easy to measure non-acoustically.
This is achieved through the analysis of the asymptotic behavior of some analytical models which have been developed previously to predict the dynamic density and/or compressibility of the equivalent fluid in a porous medium. The results are then used to predict accurately the acoustical properties of a wide range of porous media.
Kirill V Horoshenkov is Professor of Acoustics at the University of Sheffield, UK. His research interests include acoustic materials, acoustic sensors for water industry and outdoor sound propagation. He leads the EPSRC UK Acoustics Network (www.acoustics.ac.uk) and Theme 3 (Inspecting and restoring water infrastructures using robotic autonomous systems, https://twenty65.ac.uk/research-themes/robotic-autonomous-systems-for-water-infrastructure-inspection-and-rehabilitation) on the EPSRC TWENTY65 Grand Challenges Grant. He is the Secretary of the Research Coordination Committee of the UK Institute of Acoustics, Coordinating Editor of the Journal of the Acoustical Society of America (JASA) and Book Review Editor of the Journal of Applied Acoustics. He has authored/co-authored 3 books, over 180 journal and conference papers and 9 patents. He has been awarded the Tyndall Medal by the UK Institute of Acoustics and Brian Mercer Award by the Royal Society of London. He is a founder of two University spin-off companies which have exploited commercially the results of this research.