Acoustic simulation during the project development of a new car, or truck cabin, is becoming a key task for addressing the choices in terms of body structure as well as acoustic treatments optimization, both for weight reduction and final target achievement . The well known FEM technique, based on FSI (Fluid-Structure interaction) has been already applied for car body and acoustic cavity coupled analysis, but soundproofing material have been included only taking into account their acoustic impedance, representing a boundary condition for the fluid-structure interface. This article presents a review of the state-of-art in terms of dynamic and acousticsimulation of damping and sound-insulating material, using numerical techniques, focussed to complete (treated carbody + acoustic cavity) noise prediction in the 0-250 Hz frequency range. The various existing mathematical models are discussed, based on application to simple cases, but always in view of a future development of the complete 'treated' model of the car. Advantages and counterindications for the models are pointed out , based on experience gained on applications to real car parts. Separate approaches are described for damping material (single and multilayer) and for sound-insulating sandwiches (porous material + heavy layer), and also the 'equivalent material' approach is discussed for the whole treatment. Validations of mathematical models have been carried out both on 'simple structure simulators' (squared vibrating panel) and on real car panels as well, always comparing vibration velocity profile and sound/intensity/sound pressure levels with the calculated quantities coming from FEM simulation. Finally trends for future research and experimental verification of the mathematical models are briefly addressed and critically revised.
Low frequency simulation of sound-proofing materials behaviour in view of interior car acoustics optimization
Niederfrequente Simulation des Verhaltens schallisolierender Materialien im Hinblick auf die akustische Optimierung der Fahrzeugkabinen
1997
21 Seiten, 12 Bilder, 10 Quellen
Conference paper
English
AUTOMOTIVE VEHICLE SOUND PROOFING PART AND RELATED PROCESS
European Patent Office | 2019
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