Sound package for a magnesium alloy dash panel
Keywords:Acoustic wave absorption, Magnesium alloys, Sound insulating materials, 3D models, Automobile companies, Car cabins, Damping material, Low frequency, Low mass, Sound absorption, Sound transmission loss, Statistical energy analysis, Steel parts, Transmission loss, Volkswagen, Weight ratios
AbstractThe automobile companies such as Ford and Volkswagen decided to use magnesium alloy to replace some steel parts of the car. The magnesium alloy has several advantages over steel. It is more malleable, more ductile, lighter, and it has a higher stiffness weight ratio. However, its low mass gives a poor sound transmission loss performance compared to steel. A 3D model of a car has been designed in the statistical energy analysis (SEA) software VA ONE to calculate the average sound absorption of the car cabin. This model takes into account the sound absorption of seats, roof, floor and doors. The first concept is composed of absorbers and insulators materials. A similar structure was used for the second concept. Only a small damping material layer was added to improve the transmission loss at low frequencies. The optimization was performed on 33 different materials considering the following criteria.
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