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Acoustic–Structural Study for the Cabin of an Automotive Vehicle

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Author(s): L.A. Aguilera–Cortés | A.L. Herrera–May | M. Torres–Cisneros | M.A. González–Palacios | E.J. González–Galván

Journal: Ingeniería Investigación y Tecnologia
ISSN 1405-7743

Volume: 11;
Issue: 1;
Start page: 73;
Date: 2010;
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Keywords: Cabin of an automotive vehicle | stress | finite element method | acoustic pressure | acoustic–structural system | vibrations.

ABSTRACT
An acoustic–structural study of a cabin for an automotive vehicle through a new 3D finite element model is presented. This model, which is developed with software ANSYS, has a simple geometrical configuration to provide the uncoupled and coupled acoustic–structural modes of the cabin with computing minimum time. In addition, the model easily obtains the results of interior sound pressure and stress in the cabin caused by a harmonic excitation. The results of the first coupled–system modes are of rigid type and they have frequencies smaller than 5 Hz. However, the main acoustic modes are present for frequencies greater than 87 Hz, with the exception of Helmholtz mode (0 Hz). The highest acoustic pressure (in the range from 2 to 400 Hz) is 107.8 dB for a harmonic excitation of 1 N. The structure of the cabin registers a maximum stress of 1.85 MPa to 51 Hz. The model proposed significantly contributes in the evaluation of noise level and stress for an automotive vehicle.
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