title: Deduction of static surface roughness from complex excess attenuation.
abstract: Data for complex excess attenuation have been used to determine the effective surface admittance and hence characteristic roughness size of a surface comprising a random distribution of semi-cylindrical rods on an acoustically hard plane. The inversion for roughness size is based on a simplified boss model. The technique is shown to be effective to within 4%, up to a threshold roughness packing density of 32%, above which the interaction between scattering elements appears to exceed that allowed by the model.
authors.affiliation: School of Engineering, University of Bradford, Richmond Road, BD71DP, United Kingdom. a.nichols2@bradford.ac.uk
authors.forename: Andrew
authors.initials: A
authors.lastname: Nichols
authors.forename: Keith
authors.initials: K
authors.lastname: Attenborough
authors.forename: Shahram
authors.initials: S
authors.lastname: Taherzadeh
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D004867:Equipment Design; D006244:Hardness; D008962:Models, Theoretical; D009038:Motion; D013016:Sound; D013499:Surface Properties