Currently, the exterior pass-by noise level during acceleration is the only legal limit in vehicle acoustics. In an effort to further reduce noise emissions, a tightening of limit values and/or procedures is to be expected. Pass-by noise simulation can support the design activities of car manufactures in this field. It is based on the measurement of the individual noise sources and the corresponding airborne noise transfer functions. Important noise sources include for instance the engine, the intake orifice, the exhaust orifice as well as the tires. The transfer functions depend on the position of the vehicle and are measured reciprocal. In the simulation, the individual excitations are synchronized and filtered by applying the transfer functions. Thus, the total noise can be assigend to the individual noise paths and the individual noise paths can be analyzed with regard to excitation, transfer behavior and frequency content. Thus, development efforts can be focused on the dominant noise sources and the weak points of the vehicle and the engine.
Vehicle exterior noise simulation
Simulation des Fahrzeugaußengeräusches
2006
6 Seiten, 6 Bilder, 3 Quellen
Conference paper
Storage medium
English
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