A review of mid-frequency vibro-acoustic modelling for highspeed train extruded aluminium panels as well as the most recent developments in hybrid modelling techniques

The present paper reviews the vibro-acoustic modelling of extruded aluminium train lloor structures including the state-of-the-art of its industrial applications,as well as the most recent developments on mid-frequency modelling techniques in general.With the common purpose to predict mid-frequency vibro-acoustic responses of stiffened panel structures to an acceptable accuracy at a reasonable computational cost,relevant techniques are mainly based on one of the following three types of mid-frequency vibroacoustic modelling principles:(1) enhanced deterministic methods,(2) enhanced statistical methods,and(3) hybrid deterministic/statistical methods.It is shown that,although recent developments have led to a significant step forward in industrial applicability,mature and adequate prediction techniques,however,are still very much required for solving sound transmission through,and radiation from,extruded aluminium panels used on high-speed trains.Due to their great potentials for predicting mid-frequency vibro-acoustics of stiffened panel structures,two of recently developed mid-frequency modelling approaches,i.e.the so-called hybrid finite element-statistical energy analysis(FE-SEA) and hybrid wave-based methodstatistical energy analysis(WBM-SEA),are then recapitulated.