TY - GEN
T1 - Modelling of rigid-frame porous materials - A simple approach
AU - Brennan, M. J.
AU - To, W. M.
N1 - Publisher Copyright:
© 2000 American Society of Mechanical Engineers (ASME). All rights reserved.
PY - 2000
Y1 - 2000
N2 - This paper is concerned with the modelling of rigidframe porous materials. Currently there are very simple models which describe the acoustic behaviour of such materials, and there are also very complicated models. The aim of this paper is to present a model which occupies the "middle ground", but is simple enough to be used by practising noise control engineers. Using concepts of acoustic mass, stiffness and damping, non-dimensional expressions for the acoustic wavenumber and the characteristic impedance of a rigid-frame porous material are derived. These expressions are used to give a "rule of thumb" for the optimum flow resistivity for a given thickness of material.
AB - This paper is concerned with the modelling of rigidframe porous materials. Currently there are very simple models which describe the acoustic behaviour of such materials, and there are also very complicated models. The aim of this paper is to present a model which occupies the "middle ground", but is simple enough to be used by practising noise control engineers. Using concepts of acoustic mass, stiffness and damping, non-dimensional expressions for the acoustic wavenumber and the characteristic impedance of a rigid-frame porous material are derived. These expressions are used to give a "rule of thumb" for the optimum flow resistivity for a given thickness of material.
UR - http://www.scopus.com/inward/record.url?scp=85119861266&partnerID=8YFLogxK
U2 - 10.1115/IMECE2000-1637
DO - 10.1115/IMECE2000-1637
M3 - Conference contribution
AN - SCOPUS:85119861266
T3 - ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
SP - 479
EP - 485
BT - Noise Control and Acoustics
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 2000 International Mechanical Engineering Congress and Exposition, IMECE 2000
Y2 - 5 November 2000 through 10 November 2000
ER -