Global sensitivity analysis of analytical vibroacoustic transmission models

Jean-Loup Christen (1, 2) , Mohamed Ichchou (1, 2) , Bernard Troclet (3) , Olivier Bareille (1, 2) , Morvan Ouisse (4)

1 ECL - École Centrale de Lyon
2 LTDS - Laboratoire de Tribologie et Dynamique des Systèmes
3 Airbus Defence and Space [Toulouse]
4 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)

Noise reduction issues arise in many engineering problems. One typical vibroacoustic problem is the transmission loss (TL) optimisation and control. The TL depends mainly on the mechanical parameters of the considered media. At early stages of the design, such parameters are not well known. Decision making tools are therefore needed to tackle this issue. In this paper, we consider the use of the Fourier Amplitude Sensitivity Test (FAST) for the analysis of the impact of mechanical parameters on features of interest. FAST is implemented with several structural configurations. FAST method is used to estimate the relative influence of the model parameters while as suming some uncertainty or variability on their values. The method others a way to synthesize the results of a multiparametric analysis with large variability. Results are presented for transmission loss of isotropic, orthotropic and sandwich plates excited by a diffuse field on one side. Qualitative trends found agree with the physical expectation. Design rules can then be set up for vibroacoustic indicators. The case of a sandwich plate is taken as an example of the use of this method inside an optimisation process and for uncertainty quantification.

Domaines: Mécanique [physics.med-ph]

Jean-Loup Christen, Mohamed Ichchou, Bernard Troclet, Olivier Bareille, Morvan Ouisse. Global sensitivity analysis of analytical vibroacoustic transmission models. Journal of Sound and Vibration, 2016, 368, pp.121-124. ⟨10.1016/j.jsv.2016.01.009⟩. ⟨hal-01480125⟩