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The University of Southampton
Engineering

Toward a probabilistic approach of vehicle noise assessment Seminar

Time:
16:00
Date:
7 March 2017
Venue:
13/3017

Event details

Since todays design process of vehicles mainly relies on simulations, the relevance of models -ie their capability to foreseen system’s responses to real life stress- is a crucial engineering issue.

In this context, noise assessment against objective criteria remains difficult mostly because today simulation load cases only cover a small portion of the operating range of vehicles. Thus, it is proposed to build vehicle interior noise indicators, based on classical annoyance/exposure criteria such as the equivalent level or statistical level indicators.

Within the current simulation process low frequency noise –either booming or rolling noise- is considered as a product of forces and vibroacoustic frequency response functions (FRFs). Both terms are subject to uncertainties and variability that enforce a probabilistic approach to apply the proposed indicator. For this purpose, forces as well a FRFs require a probabilistic modeling.

First, a single vehicle’s noise in real driving conditions will be analyzed as a random process and modelled using random functions of operating conditions parameters such as rpm or delivered torque. Since only one vehicle is considered, noise dispersion is mostly caused by the dynamic excitation dispersion that is observed indirectly.

FRFs dispersion can be observed more directly through end-of-line measurements. After experimental results are presented, a non-parametric modeling is introduced considering uncertainties as a whole. Such a method provides an efficient way to build the probability laws of a vehicle structural-acoustic FRF.

Speaker information

Laurent Gagliardini , Peugeot Citroen. Laurent Gagliardini graduated from Ecole Normale Supérieure (ENS) de Cachan in Civil Engineering in 1983 and received the PhD in acoustics from INSA Lyon in 1991 for a thesis on Numerical simulation of sound transmission through multiple walls. From 1983 to 1996, he was a research engineer at CSTB’s acoustics department, which is the French research centre for the building industry. In 1997 he joined PSA Peugeot Citroën as a engineer working in the research and development department and has been an expert at the vehicle NVH department since 2008. His work has covered a broad range of topics including structural-acoustic coupling at low (FEA), mid and high (SEA) frequencies; stochastic modeling; inverse methods for noise and vibration sources; vehicle aeroacoustics; acoustic quality and sound simulation; audio equipment development and engine Sound enhancement. He has been a member of the board of the French Society of Acoustics (SFA) since 2008 and has been Vice-President since 2011.

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