Fast broadband curved Insertion Loss simulation of an inner dash insulator using a cylindrical Transfer Matrix Method spectral approach 2019-01-1583
Middle and high frequency vibro-acoustic simulation of complex shape insulators requires using 3D poroelastic finite elements either for the whole part (up to 2500 Hz maximum) or through singly curved pre-computed Insertion Losses (up to 5000 Hz maximum) to be introduced in large SEA or energy-based models. Indeed, a dependence of the Insertion Loss slopes of noise treatments following the curvature is observed both experimentally and numerically.
Beyond frequency range limitations, poroelastic finite elements computations take too much time of typically a few hours each, following all curvatures and thickness 3D maps. A cylindrical Transfer Matrix Method spectral approach allows computing the singly curved Insertion Losses up to 10 kHz in a few minutes only. This is a huge simplification for the SEA modeling effort enabling easier and more precise fully trimmed vehicle middle and high frequency vibro-acoustic simulations. A dash insulator Insertion Loss numerical validation case will be presented comparing all methods with one another.