Abstract

AGUILERA-CORTES, L.A. et al. Acoustic-Structural Study for the Cabin of an Automotive Vehicle. Ing. invest. y tecnol. [online]. 2010, vol.11, n.1, pp.73-86. ISSN 2594-0732.

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.

Keywords : Cabin of an automotive vehicle; stress; finite element method; acoustic pressure; acoustic-structural system; vibrations.