The Acoustics Group is based in
the National College, a laboratory complex containing test chambers designed
for research and testing. The laboratories are furnished with a full range
of modern instrumentation for measuring sound, vibration and undertaking
audiometry.
An anechoic chamber, 7.6 x 6.4 x
4.2m, is used to test loudspeakers for directivity and sound power,,
undertake binaural recording, test hearing protectors and demonstrate
fundamental acoustic principles.
Two sound proof booths are
available for audiometric screening using Amplivox and Kamplex equipment.
A reverberation chamber, 7.6 x
6.4 x 4.2m, is used to test the absorptive properties of materials. Either a
Rion dodecahedron loudspeaker or a Bruel and Kjaer portable loudspeaker is
used. Measurements are taken using either Norsonic 121 Analyser or using
WinMLS.
The laboratory have many
standard simple experiments to demonstrate fundamental acoustic method
including active noise control, standing waves, weighting networking, speech
intelligibility, sound insulation and dosimetry.
Software simulation tools that
are available to students and researchers include AutoCAD and Ramsete for
room acoustics, Odeon for room acoustics, Soundplan for noise mapping, CATT-Acoustics
for room acoustics, Google Sketchup for design work, Matlab for signal
processing, and Fluent for CFD simulations.
Portable equipment includes 1/3
octave sound level meters (B&K, CEL, Larson Davis, Norsonic, Cirrus
Research), vibration meters (Rion harm/arm, Svantek for buildings),
dosimeters (Cirrus Research, Larson Davis), and duel channel analysers for
sound insulation air-borne and impact (Norsonic, B&K),
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