Adrian COROIAN, Iulian LUPEA


In the present paper, are presented the acoustics sources for overall interior sound of car and the transfer path for each source. These acoustic and vibration sources can be classified in structure borne and air-borne noise. The structure-borne noise contains the noise coming from the excitation forces and transmitted from the vibrating sources to the vehicle body through the attachment points. The air-borne noise is the radiated noise from the source which is transferred in the air through panels of the car body to passenger compartment. In the second part of this study, to find the natural frequencies and the associated modes shapes for both structure and air cavity, the normal mode analysis of the structure and the air has been performed by using finite element analysis . In order to do the analysis, a prototype has been built to simulate the interior cavity of a medium size automobile.

Key words: structure-borne, airborne, finite element analysis, normal mode analysis

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Barry, W., Bob, B., Mike, D., Anita, C., Pranab, S., Rod, H., Automotive Noise and Vibration Control – Practice in the New Millenium, Noise & Vibration Conference and Exhibition, Traverse City, Michigan, May 5-8, 2003

Frank, F., John, W., Advanced Applications in Acoustics, Noise and Vibration, Taylor & Francis e-Library, 2005

Harrison, M., Vehicle Refinement Controlling Noise and Vibration in Road Vehicles, Butterworth-Heinemann, 2004

Klaus, G., Vehicle Interior noise–Combination of Sound, Vibration and Interactivity, Acoustical Publication, ISSN 1541-0161, Cleveland, 1992

Lupea, I., Tibrea, R., Acoustic normal modes simulation of a classroom, Acta Technica Napocensis, Applied Mathematics and Mechanics 54, vol. IV, 2011

Lupea, I., Szatmari, R., Vibroacoustic Frequency Response on a Passenger Compartment, Journal of Vibroengineering, vol.4, 2010, p. 406-418

Lupea, I., Consideration on the Helmholtz resonator, simulation and experiment, Proceedings of the Romanian Academy, series A, vol.13, no 2/2012. Pp. 118-124, 2012

Muthukrishnan, A., Car Cavity Acoustics using ANSYS, International ANSYS Conference, May 2-4 , 2006.

Robert, B., Roger, L.W., An Introduction to Tire/Pavement Noise of Asphalt Pavement,

Peter, K., Experimental Analysis of Structure-Borne Tyre/Road Noise due to Road Surface Discontinuities, ETE 2009 / GrasMech, Brussels

Sanderson, M. A., CAE Interior Cavity Model Validation using Acoustic Modal Analysis,

Tandogan, F. O., Technichal note: Vehicle interior noise source contribution and transfer path analysis, Int.J.Vehicle Design, Vol. 52, Nos. 1/2/3/4, 2010

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