Symposer – Sound Design for Vehicles with Charged Engines

Authors

Dr.-Ing. W. Wenzel, Dipl.-Ing. M. Alex, MANN+HUMMEL GmbH, Ludwigsburg

Year

2005

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 595

Summary

With regard to vehicle acoustics, attention was in the past focussed primarily on noise reduction. Now, however, it increasingly provides a distinction against otherwise relatively equal technical competition, which can be experienced by the driver. Particularly in sporty vehicles, the driver expects to receive acoustic signal which corresponds to the driving dynamics, and which appropriately reinforces the character of the vehicle. The air intake system offers attractive scope and conditions to apply a sound system to affect the acoustics inside the passenger compartment. In charged engines, the pulsations generated in the intake manifold which produce the typical acoustic characteristics in the low-pressure area and thus at the orifice are dampened by the intercoolers and compressors in the intake system. To remedy this problem, special acoustic systems have been devised which transfer specific sounds from the intake pulsations in the high-pressure area into the passenger compartment. The Symposer as an acoustic transmission device has been developed in cooperation with the Advanced Development Department at DaimlerChrysler to meet this specific requirement.

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