Materiacustica offers the
following services:
- Design of anechoic chambers and
semi-anechoic
- Designing Reverberation Rooms
- Chamber design coupled for the
measurement of Transmission Loss
- Testing the acoustic performance of the
laboratories
Acoustical design of Anechoic and Hemi-anechoic
chambers
The acoustic design of anechoic
and semi-anechoic chamber is
supported by the use of a finite
element code and code
of a complex image source bssed
for the determination of the
cutoff frequency.
Initially the acoustical surface
properties of the wedgesare
determined by means of a 3D FEM
model by implementing the transfer
function method in a virtual
plane wave tube.
Subsequently a complex source
images model of the whole room is
utilized in which the wedges have
been replaced by flat surfaces
with the equivalent surface
acoustical properties.
The acoustic field in each point
of the space is calculated as the
sum of complexes contributions,
direct pressure (from the source)
and reflected from the side
surfaces.
Finally the sound pressure
levels along different diagonals
are determined and comparisons
with theoretical trends in free
field, as required by ISO 3745.
Acoustical design of Reverberant chambers
Acoustical performance of the
chamber in the range of
frequencies below the Schroeder
frequency are firstly evaluated
with the finite element method. In
particular, through the use of FEM
analyzes are carried out as
follows:
- optimization of the geometry of the room
- analysis for the determination of the natural modes
of the environment
- optimizing the position of sources, microphones and
speakers according to the reference standard (ISO 3741, ISO 3745, ASTM E-90,
ISO 354)
Qualification of chambers
By using multichannel measurement systems we can perform testing of
hemi-anechoic and anechoic chambers in accordance with ISO 3745 and
reverberation chambers in accordance with ISO 3741, ISO 3745, ASTM E-90, ISO
354.
Experiences
- Reverberant room and coupled rooms of
the
University of Ferrara
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