A parametric study of the acoustic properties of thermal cladding systems

Thermal cladding systems have developed and modernised since the first were implemented, predictions of single figure sound insulation improvement, ?RW, based on natural frequency, f0, spring-mass covering may no longer be reliable. To identify aspects compound acoustic behaviour due to multiple power flow paths thermal insulating system, a statistical energy analysis (SEA) prediction model was developed. A simplified calculation ?R, is described, allowing high frequency (f > f0) predicted. parametric study in which impact different construction materials discussed; damping constants, elastic properties interlayer fixings, number thickness material (including bending stiffness) weatherproof outer layer heavyweight wall are assessed. While agreement within 4.0 dB (mean absolute differences) between calculated measured results for thick render (?8.0 mm) curtain can obtained at frequencies using methodology, this approach not successful predicting values. This because values weighted towards low frequencies. Correlation f0 with ?RW slightly improved (r.m.s. differences 2.62 compared 3.21 methodology EN ISO12354 Annex D) when modified method calculate combined stiffness used. improve further, must obtain transfer function, Ytr, used non-resonant coupling loss factor resonance wall. The mobility connections, Yc, should also accurately characterised ensure accurate