(From ZHOU Chengguang of CAS Key Lab of Noise and Vibration Research) On May 13, 2011, Dr. L. Gagliardini visited Institute of Acoustics, Chinese Academy of Sciences (IACAS) and made a report entitled "Energy methods in structural acoustics including SEA and finite elements, with applications on cars". The report was chaired by Prof. LIU Bilong, and many researchers and students participated in it.
L. Gagliardini was Born 1961 in Grenoble (France). He graduated from Ecole Normale Supérieure (ENS) de Cachan in Civil Engineering in 1983, received PhD in acoustics at INSA Lyon with Pr Guyader in 1991: Numerical simulation of sound transmission through multiple-walls. He was research engineer at CSTB's acoustic dept (French research center for the building industry) between 1983 and 1996 on sound transmission analytical and numerical modeling in ships and buildings, SEA, insulating and absorbing products development, international standards development. Since 1997 he has worked as Engineer at PSA Peugeot-Citroën, expert at the vehicle NVH department on Structural-acoustic coupling at low (FEA), mid and high (SEA) frequencies, Stochastic modeling, Inverse methods for noise and vibration sources, Vehicle aeroacoustics. He had Noise and Vibration teaching at Ecole Nationale des ponts et chaussées (ENPC) from 1987 to 2000 on general acoustics course and building acoustics course. He has close collaboration with Pr Soize from Université Paris-Est since 2002 on structural-acoustic stochastic modeling.
His report includes two parts. The first part is "A partitioning methodology of complex uncertain structure-acoustic systems in the low and medium frequency ranges." In this approach, a local vibroacoustic energy model as well as a simplification of this model is constructed. Then an extension of the previous theory is performed in order to include the case of general input forces, and a structural partitioning methodology is presented along with a set of tools used for the construction of a partitioning. The second part is "Virtual SEA Towards an Industrial Process". In this part, detailed analyses are given for the vehicle vibration response of a practical application.
This report describes both the theoretical part in-depth and detailed analysis of the practical application, that arouses heated discussions around the participants, enhances the mutual understanding and communication in the automotive noise and vibration field.