Vibro-acoustics

Vibroacoustics is the historical research field of the laboratory. It hasmade numerous scientific articles as well as important finalised contracts of research. The scientific objectives are:

• modelling of structure vibrations coupled to light fluids as  air or heavy fluids as water,
• modelling and prediction of the radiated noise, the understanding of radiating physical phenomena and acoustic transmission,
• development of methods in the reduction of radiated noise,
• identification of physical phenomena and validation of theoretical models thanks to adequate measurement techniques,
• development of energy based methods adapted to mid to high frequency ranges

 Examples of studies: Development of new methods for vibroacoustic predictions at low and mid frequencies to maintain acoustic performances of a truck’s cabin (Renault Trucks) in spite of a weight reduction target (FUI CLIC)        Prediction of the acoustic radiation of complex structures by substructuring approaches. Application to the radiation of the engine compartment of an automobile    Numerical modelling of vibrations from a pseudo-periodically stiffened  finite orthotropic plate (applications to the vibro-acoustics issued from some of the piano fronts) Study of the vibratory propagation in structures coupled to stratified ground surfaces and application to ground level railway crossing plates Modelling of the vibroacoustic behaviour of stiffened submarine shells through internal structures and submitted to different types of excitations  Collaboration with CEA LETI for the achievement of a digital loudspeaker : MEMS technology (consisting in fabricating hybrid carbon nanotube films - MEMS devices for a novel thin film through a porosimetry measurement, Micro-Electro-Mechanical Systems) (FUI SONATE) and in a Micro/Nano gauge MEMS microphone for a sound processor (ANR MADNEMS : coll. Neurelec, IM2NP)