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Tuesday, July 9 • 11:10 - 11:30
REFLECTION COEFFICIENTS OF ACOUSTIC BLACK HOLES WITH LOCAL THERMAL VARIATIONS

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The insertion of Acoustic Black Holes (ABH) in a flat panel or in a beam termination is an innovative technique for controlling passively structural vibration damping without added mass. ABH consists in local variations of the stiffness (made with thickness variations) and the local damping (made with a thin visco-elastic layer) and are known as efficient absorbers for flexural waves above its cut-on frequency. The goal of the paper is to identify and to push the current limitations of this existing strategy by developing "enhanced acoustic black holes" absorbers for which the control of the damping properties is sought by different possible techniques including thermal variations.The capability of such techniques to enhance the control of the flexural rigidity and the local damping is investigated numerically. The reflection coefficients of several architectures of ABH beam termination are computed using the impedance matrix method. Such a method is adapted to the accurate computation of the reflection coefficient of a structural wave guide with varying properties. Comparing the reflection coefficients of several architectures allows us to discuss the potentialities of such enhanced Acoustic Black Holes.

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avatar for Mohammad Rafiee

Mohammad Rafiee

Postdoctoral Fellow, Polytechnique Montréal
Mohammad Rafiee received his Ph.D. degree in Mechanical Engineering from the University of Ottawa in 2018. Currently, he is a Postdoctoral Fellow at Polytechnique Montreal in Canada. His research interests are primarily focused on the development of advanced composite materials, smart... Read More →

Authors

Tuesday July 9, 2019 11:10 - 11:30 EDT
Outremont 6
  T08 Mat. for noise & vibr. cntrl., SS02 Vibr damping materials