Nowadays, particular attention is devoted to the vibroacoustic comfort of vehicles in automotive industry. Various panels in the automobile, which are liable to vibration problems, are often treated with damping measures. A prevalent method is to attach viscoelastic materials on the surfaces of the panels. Nevertheless, this approach has some drawbacks like marked weight and limited effective range in frequency domain. In this contribution, a new damping approach is presented: interface damping is proposed which provides specific performances and covers some drawbacks of the conventional surface dampers. Interface damping exploits viscoelastic materials at the interface between the panel and its peripheral components, wherein a soft and flexible interface is formed instead of bonding the panel in a rigid way to other structures. An aluminum plate surrounded by a stiff sandwich frame and glued with butyl rubber at the interface was used as characteristic sample for the investigation in this approach. Both experiments and simulations were performed and correlated to each other. A parametric study for investigating the influence of the viscoelastic material properties and the interface geometry on the damping behavior for the panels was conducted. The results exhibit that interface damping is an excellent approach that mitigates the vibrations on the structures stably at any frequency. It provides also remarkable damping at global modes of the whole system. Lastly, the applicability of interface damping in real components is investigated with the simulation of a real vehicle panel: a spare wheel pan made of glass mat reinforced thermoplastic (GMT, glass fibers & polypropylene) with the volume of ca. 623 mm×657 mm×73 mm. Butyl rubber interface damping and four commercial adhesives were applied on the spare wheel pan with a periphery frame under same boundary conditions. The vibration behavior of the spare wheel pan doesn't vary significantly with different soft and stiff adhesives, where no pronounced damping can be perceived. Only the butyl interface damping suppresses the resonances notably with the amplitude decay of 4-12 dB at all modes. A compromised option, which provides acceptable performance for damping and mechanical requirements, is to combine both adhesives and butyl interface dampers at the interface.
Interface damping of automotive panel structures
2013
18 Seiten, 21 Bilder, 5 Tabellen, 4 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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