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Wednesday, July 10 • 11:10 - 11:30
FLEXURAL WAVE CONCENTRATION EFFECT IN TAPERED RODS AND WEDGE-LIKE BEAMS WITH POWER-LAW THICKNESS

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The Acoustic Black Hole (ABH) effect for vibration control and sound absorption can be realized in tailored structures with a power-law-profiled thickness variation, because the wave velocity can gradually decrease to zero in an ideal scenario. This means that no reflection occurs since the bending wave does not reflect, and one of the merits associated with ABH structures is that the vibration energy can be completely captured at the tip of the wedge structures. This feature makes ABH structures have a great potential in the fields of vibration reduction and energy harvesting. In this paper, in order to describe the energy focalization effect properly, the energy ratio can be defined as the proportion of the vibration energy trapped within the arbitrary vicinity of the edge to that of the whole structure. The semi-analytical method will be used to established the dynamical model as it can describe the system from the perspective of energy. This paper presents the difference of the energy concentration effect between the tapered rod and the wedge-shaped beam, and one can find that both of them own similar effect on energy trapping, however, the energy density at the tip of the rod is obviously larger than that at the edge of the wedge beam. This means that adhering less viscoelastic materials on the edge of tapered rods can achieve similar energy concentration effect compared with wedge-shaped beams. Numerical simulation results have verified this merit of tapered rod, which enable ABH rods to perform better in vibration reduction compared with wedge-like beams

Moderators
ST

Stephan Tewes

Interior Noise Integration & Vibration, Airbus Operations GmbH

Authors

Wednesday July 10, 2019 11:10 - 11:30 EDT
St-Laurent 6