It is well known that estate cars (in the US called ''station wagon'') tend to be sensitive to low-frequency vibration input caused by the stochastic macrostructure of the road surface. This may result in a strong low-frequency acoustic excitation within the passenger cabin which is subjectively felt to be uncomfortable. As a feasibility study an ANC system has been installed into an experimental car. The aim was to show the potential for a reduction of the unpleasant noise. To begin, an investigation of the vibrational behavior of the chassis was performed. Within the critical frequency range there were only a few dominant principal components that could be extracted. As primary sensors for a feedforward ANC system accelerometers have been mounted at positions on the axles, giving ANC system which feeds loudspeakers as secondary sources for cancellation in the cabin. Adaption is maintained by error microphones installed into the headliner of the cabin. The resultant reduction of the road noise provides a considerable enhancement in the noise comfort of the estate car.
Adaptive road noise cancellation for a midclass estate car
Adaptive Fahrgeräuschaufhebung für einen Mittelklasse-Kombiwagen
1999
4 Seiten, 4 Bilder, 5 Quellen
Conference paper
Storage medium
English
Adaptive noise cancellation for road vehicles
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