Wave modelling in predictive vibro-acoustics: Applications to rail vehicles and aircraft

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

“…11 in Ref. [14]). Measured, black dot; PCM calculated, solid line; WFEM calculated, dashed line damping loss factor, and acoustic transmission loss (and hence the coupling loss factors with the acoustical domain) can all be formulated as explicit expressions so as to compute efficiently and more accurately.…”

“…Contrary to the element-based numerical solutions, wave-based analytical method (WBM), as an indirect Trefftz approach, approximates the field variable by a weighted sum of so-called ''wave functions'', each of which is an exact solution of the governing differential equation of the problem domain [24]. These wave functions comprise [14]). Rib-located: predicted, black line; measured, black dot.…”

“…[14], two different deterministic approaches were used to predict the sound transmission of a section of extruded aluminium train floor structure. One was a model based on the periodicity of the structure, i.e.…”

“…Since these major assumptions tend to be met only above a certain frequency limit, the method is restricted to the high-frequency range. Enhanced statistical methods therefore try to extend the statistical approaches towards lower frequencies [14].…”

“…It has been found [7][8][9][10][11][12][13][14] that the vibrational and sound transmission behaviours of such kinds of stiffened panel structures can be very difficult to predict by either conventional deterministic methods, such as finite element methods (FEM) and/or boundary element methods (BEM), or conventional statistical methods, such as statistical energy analysis (SEA). This is mainly because the extruded train panel structures are built up by beam-like stiffeners and thin flat panels.…”