OBoy et al RASD 2010.pdf (603.8 kB)
Damping of flexural vibrations in thin plates using one and two dimensional acoustic black hole effect
conference contribution
posted on 2012-05-16, 10:13 authored by Daniel O'BoyDaniel O'Boy, E.P. Bowyer, Victor V. KrylovThe reduction of flexural vibration in thin plates is examined using the acoustic black hole
effect associated with nearly zero reflection of quasi-plane waves from a lightly damped
wedge or tapered hole where the profile varies according to a power-law. The flexural wave
propagation can be determined through the application of geometrical acoustics
approximation or exact analytical solutions. For a plate of thickness of power-law profile, the
wave slows down and grows in amplitude. In the ideal case of no truncation of the quadratic
(or higher) profile, the phase speed asymptotically decreases to zero and the wave never
reaches the end. Manufactured plates always have a truncation, leading to relatively high
reflection coefficients, however, the application of small damping layers leads to substantial
decreases in the reflection coefficients and thus large reductions in mobility amplitudes.
This paper contains the results of numerical models and experimental measurements of point
mobility for structural plates incorporating tapered holes for validation. A rectangular plate
with a 1D wedge on one end is examined, in addition to a circular plate with a quadratic
profile in the centre. In both cases, the measurements show significant reductions in resonant
peaks of mobility, in good agreement to numerical predictions.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Aeronautical and Automotive Engineering
Citation
O'BOY, D.J., BOWYER, E.P. and KRYLOV, V.V., 2010. Damping of flexural vibrations in thin plates using one and two dimensional acoustic black hole effect. 10th International Conference on Recent Advances in Structural Dynamics (RASD 2010), Southampton, UK, 12 - 14 July.Publisher
European Acoustics Association (EAA)Version
- AM (Accepted Manuscript)
Publication date
2010Notes
This conference paper was presented at the Tenth International Conference on Recent Advances in Structural Dynamics (RASD 2010) at Southampton University, United Kingdom, on 12-14 July 2010. It was a special EAA event (http://www.european-acoustics.org/event-calendar/list_of_events/2010/event.2009-09-28).Language
- en