Vibroacoustic characterization of materials

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

Materials characterization

• Young’s modulus and shear 
  
• Poisson ratio
• Damping
• Dynamic stiffness
• Sound absorption coefficient
• Sound reduction index
• Insertion loss

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

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 PSA 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)