Characterizations of materials & sources

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

ISO 9053 for the measurement of static air flow resistivity.

Our software PipingCell can be used to characterize sound sources.

In-situ measurements

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)

In-situ characterization
of underlay acoustical efficiency
to rolling and impact noise

In-situ acoustic measurement

Sound insulation, reverberation time ...

Test rig designs

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.

We also design customized test rigs, from the hardware to the analysis software

Acoustic measurements

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 ...