Title: On a simple technique to measure the airborne noise in a car interior using substitution source

Authors: Azma Putra; Fudhail A. Munir; Clinton D. Juis

Addresses: Vibration and Acoustics Research Group, Faculty of Mechanical Engineering, Universiti Teknikal Malaysia Melaka (UTeM), Hang Tuah Jaya 76100, Durian Tunggal, Melaka, Malaysia. ' Vibration and Acoustics Research Group, Faculty of Mechanical Engineering, Universiti Teknikal Malaysia Melaka (UTeM), Hang Tuah Jaya 76100, Durian Tunggal, Melaka, Malaysia. ' Vibration and Acoustics Research Group, Faculty of Mechanical Engineering, Universiti Teknikal Malaysia Melaka (UTeM), Hang Tuah Jaya 76100, Durian Tunggal, Melaka, Malaysia

Abstract: From various methods of measuring noise in a motor vehicle, a technique to separate the airborne and structure-borne noise is of interest as an important measure to improve the noise control treatment. This paper proposes a simple technique to measure the contribution of the airborne noise in a vehicle cabin using substitution source method. A cone loudspeaker was used as the substitution source and the airborne transfer function was measured. The technique has successfully separated the airborne transmission with the intersection frequency at roughly 400 Hz with the structure-borne noise. It is found that this is independent of the engine speed.

Keywords: airborne noise; structure-borne noise; source substitution; transfer function; interior noise; vehicle noise; noise control; vehicle cabins.

DOI: 10.1504/IJVNV.2012.048166

International Journal of Vehicle Noise and Vibration, 2012 Vol.8 No.3, pp.275 - 287

Available online: 23 Jul 2012 *

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