A simple technique to measure the airborne noise in a vehicle cabin has been proposed using substitution source method. A cone loudspeaker was employed as the substitution source to measure the airborne transfer function. The airborne noise can be separated from the total transmission with the intersection frequency at 400 Hz. This transition frequency is also found to be independent of the speed of the engine. Separation of this transmission path is useful as a measure of the noise control treatment, for example the quality of the sealing of gaps or leakages at the bulkhead for the airborne path. In the experiment, the loudspeaker used produces low sound energy. To obtain a more accurate 'transmission loss' transfer function, it is suggested to employ a source producing greater sound energy particularly at high frequencies for sound to penetrate the vehicle cabin optimally. The measurement can also be conducted in a special room such anechoic chamber to avoid unwanted background noise. For an advanced measurement, this can be conducted using the engine noise simulator which resembles the noise emitted from the real engine.
On a simple technique to measure the airborne noise in a car interior using substitution source
International Journal of Vehicle Noise and Vibration ; 8 , 3 ; 275-287
2012
13 Seiten, 13 Bilder, 22 Quellen
Aufsatz (Zeitschrift)
Englisch
On a simple technique to measure the airborne noise in a car interior using substitution source
Online Contents | 2012
|On a simple technique to measure the airborne noise in a car interior using substitution source
Kraftfahrwesen | 2012
|Airborne road noise source definition
Kraftfahrwesen | 1998
|Airborne road noise source definition
British Library Conference Proceedings | 1998
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