Mechanical and acoustical characterization of materials

The CEVAA offers its materials expertise in the vibration and acoustic fields.

Materials characterization

The CEVAA takes into account the characteristics of the materials, their requirements and their behavior under operational conditions.

Mechanical properties

• Rigidity (Young’s modulus and shear)
• Poisson ratio
• Damping
• Dynamic stiffness

Acoustical properties

• Sound absorption coefficient
• Sound reduction index
• Insertion loss

Our services

• Characterization of the dynamic properties (modulus of elasticity, damping, Poisson’s ratio) of viscoelastic materials, plastics, alloys, composites, …
• Characterization of the acoustic properties of porous materials
• Identification of a porous material model or a poroelastic model
• Measurement of impact or slip-grip noise, characterization of material pairs
• Measurement of sound absorption coefficient (α) and transmission loss (STL)
• Measurement of sound insulation or insertion loss (IL) of a multilayer complex or a soundproofing piece
• Modeling and optimization of damping treatments, multilayer materials, composites

Compliance with industry standards

Procedures Alliance Renault Nissan

• Impedance tube measurements according to D49 2031
• Small cabin measurements according to RNES-D-20003 & RNES-D-20004 (D45 2019 & 37-06-082) + 32-06-009,
• Measurement in Alpha cabin according to RNES-D-20001 (D49 1977)
• Renault SELF AGREMENT skills recognition

Procedures Stellantis group

• Impedance tube measurements according to D45 5430
• Small cabin measurements according to D45 5038, B65 4250, DMFV_ACV02V0248
• Measurement in Alpha cabin according to D49 1977

International standards

• Impedance tube measurements according to NF EN ISO 10534-2 and ASTM E 2611 standards
• Measurement of the composite loss factor by the Oberst method according to NF EN ISO 6721-3
• Rubbling and rattling measurement according to SAE J2192 (option 2)
• Directive 2000/14/CE