Keith Attenborough
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View article: The Use of Ecoacoustics to Monitor Soil Ecology: A Critical Review With Reference to Earthworms
The Use of Ecoacoustics to Monitor Soil Ecology: A Critical Review With Reference to Earthworms Open
The use of ecoacoustics to monitor soil ecology was identified as a priority in the 2024 horizon scan of global biological conservation issues. Proponents suggest it will have societal impacts by improving soil health assessments, enhance …
View article: Sound Absorption and Thermal Insulation by Polyurethane Foams Reinforced with Bio-Based Lignocellulosic Fillers: Data and Modeling
Sound Absorption and Thermal Insulation by Polyurethane Foams Reinforced with Bio-Based Lignocellulosic Fillers: Data and Modeling Open
The acoustic, thermal, and mechanical performances of sawdust-reinforced polyurethane (PU) foam are investigated for different thicknesses and varying mesh sizes. Acoustic properties are explored using a combination of impedance tube testi…
View article: Influence of Periodically Varying Slit Widths on Sound Absorption by a Slit Pore Medium
Influence of Periodically Varying Slit Widths on Sound Absorption by a Slit Pore Medium Open
A simple pore microstructure of parallel, identical, and inclined smooth-walled slits in a rigid solid, for which prediction of its geometrical and acoustic properties is straightforward, can yield useful sound absorption. This microstruct…
View article: Influence of Periodically Varying Slit Widths on Sound Absorption by a Slit Pore Medium
Influence of Periodically Varying Slit Widths on Sound Absorption by a Slit Pore Medium Open
A simple pore microstructure of parallel, identical, inclined smooth walled slits in a rigid solid, for which prediction of its geometrical and acoustic properties is straightforward, can yield useful sound absorption. This microstructure …
View article: Phase and group speeds of airborne surface waves over porous layers and periodically rough hard surfaces
Phase and group speeds of airborne surface waves over porous layers and periodically rough hard surfaces Open
Sound fields above porous layers or rough acoustically hard boundaries may include airborne surface waves. The surface wave properties depend on the effective surface admittance. Analytical expressions for surface wave speeds are derived f…
View article: OUTDOOR SOUND PROPAGATION: INTRODUCTION AND REVIEW OF RELATED RESEARCH PROBLEMS
OUTDOOR SOUND PROPAGATION: INTRODUCTION AND REVIEW OF RELATED RESEARCH PROBLEMS Open
APPLICNI IONS AND Pmoutdoor sound propagation is of interest to the prediction and the reduction of noise nuisance from surface and non-surface transportation and from industrial sources.In the U.K. the interest in the accuracy of predicti…
View article: THE PREDICTION OF SOUND RADIATION FROM BUILDINGS
THE PREDICTION OF SOUND RADIATION FROM BUILDINGS Open
There is an important and recognised need to develop methods for accurately predicting noise levels experienced at positions around buildings which house noise sources.These prediction methods are necessary if such buildings are to be appr…
View article: SOUND PROPAGATION THROUGH PARTICULATE SUSPENSIONS IN AIR
SOUND PROPAGATION THROUGH PARTICULATE SUSPENSIONS IN AIR Open
Predictions of the acoustic effect of solid suspensions in air my be based either on a multiple scattering analysis.or on a continuum approach using a particulate relaxation method.This paper compares the theoretical predictions for a susp…
View article: ON THE THEORY OF SOUND PROPAGATION IN A VELOCITY GRADIENT NEAR AN IMPEDANCE BOUNDARY
ON THE THEORY OF SOUND PROPAGATION IN A VELOCITY GRADIENT NEAR AN IMPEDANCE BOUNDARY Open
lntrod uctionAlthough several numerical methods including Fast Field.Parabolic Equation and Normal Mode Solutions are available for predicting outdoor sound propagation over a flat nite impedance ground.ray trace methods offer greatest con…
View article: Wood chip sound absorbers: Measurements and models
Wood chip sound absorbers: Measurements and models Open
Normal incidence absorption coefficient spectra of samples made from glued wood chips have been measured for various mesh sizes, bulk densities, thicknesses, and air gaps. Increasing thickness introduces additional layer resonance peaks an…
View article: MODELS FOR PREDICTING A-WEIGHTED NOISE FROM AIRPORT GROUND OPERATIONS
MODELS FOR PREDICTING A-WEIGHTED NOISE FROM AIRPORT GROUND OPERATIONS Open
Mcasuremens made at four distances up to 1153 m from xed jet engines sources under weirdly-monitored meteorological conditions, together with spectra measured aroimd stationary aim-alt and engines under test, have been used to derive acous…
View article: PREDICTED ACOUSTIC EFFECTS OF RAILWAY BALLAST
PREDICTED ACOUSTIC EFFECTS OF RAILWAY BALLAST Open
Noise generated by railway traffic can be a cause of considerable annoyance for people living or working in the vicinity of railway lines and railway yards. Therefore, possibilities to reduce railway noise are studied extensively. It is kn…