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Technical resources R&D

Measuring equipment and tools :

Digital analyzers, microphonics, accelerometry,
Omnidirectional source
Semi-anechoic chamber (on the Nantes site)
Test bench for measuring the acoustic performance of a rolling noise underlay ΔLBR
ISO 16940 dynamic bending stiffness test bench
Partnerships with various laboratories to measure sound attenuation and impact noise levels

Specific measurements made :

Vibration attenuation index and vibration isolation of a junction, Kij and Dvij
Sound power level in semi-anechoic chamber
In-situ sound power by intensimetric probe
Qualification and inspection of acoustic laboratories (anechoic or reverberation chambers)
Sound reduction index on small specimens for Rw max 45/50 dB (200 to 5000 Hz)
Characterization of the stiffness of soil layers using the MASW vibration method

Simulation software :

Software suite developed by the GAMBA group: AcouSSTIFF®, AcouSSTING®, AcouSTICS21®, AcouSPROPA® .
MEFISSTO developed by CSTB (vibration propagation) - finite element method 2.5 D
ANSYS - multi-physics 3D finite element calculation tool

Outils Matlab :

Acoustic propagation by FDTD (temporal)
Calculating the polar diagram of diffusing surfaces
Sound absorption prediction
Modal behavior of stiffened and unstiffened plates and free-field acoustic radiation
Vibration: soil characterization, structural behavior