Characterizations and source identifications are one of the pillars of our methodology.
We develop these techniques and design setups to improve them.
The characterization is the determination of the intrinsic parameters which identify a material or a sound source. For a material, it is a key step in understanding how a material dissipates vibrations or acoustic energy and to simulate its responses for any kind of solicitation (plane waves at normal or oblique incidence, diffuse sound field, point load...). For a source, it is also a key step to understand how the sound source behaves and how it can be reduced.
When characterization materials, each layer of a multi-layer system should be characterized independently to identify its role in the dissipation of the whole system.
In-house Kundt tubes
(inner diameters: 46 mm and 30 mm)
3 microphone positions to estimate
dynamic density and bulk modulus
ISO 6721-3 and ISO 18437-5 standards adapted to porous media
We identify noise sources from in-situ measurements and help you build a formal characterization methodology for your field of activity.
surface pressure identification
using Reverse Identification technique (RI)
of underlay acoustical efficiency
to rolling and impact noise
In-situ acoustic measurement
Sound insulation, reverberation time ...
We provide impedance tube set-ups for absorption and transmission measurements, test rigs for measuring the porosity, the static air flow resistivity, the tortuosity and the elastic & damping parameters of acoustical materials.
LabView driven with Python / Matlab / GNU-Octave overall control
Design of an extended range impedance tube
Ex : with a 100 mm impedance tube, measure up to 4 500 Hz
Characterization of partition studs
Static and dynamic stiffness ...