Numerical modelling of the Vibro-Acoustic behavior of a closed vehicle with frequency dependent polymer materials

摘要

In this paper, the vibro-acoustic response of a closed vehicle (Renault B95) is computed using a prototype tool based on the VPS software developed by ESI Group. This prototype tool takes into account the frequency dependence of the modulus of viscoelastic materials represented by the PVB of the windscreen and joints between the vehicle's body and glass surfaces. In a first step, the accelerations at different points of the windscreen and pressures inside the cabin are computed and compared to those obtained by NASTRAN software. In a second step, these results are compared with experiments obtained by Renault using accelerometers and those obtained by the University of Technology of Compiegne using a 3D laser vibrometer. Comparisons show an acceptable agreement between different numerical and experimental results.