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Thursday, July 11 • 10:40 - 11:00
NUMERICAL AND EXPERIMENTAL VIBRATION OF A SAND-WICH BEAM WITH A FUNCTIONALLY GRADED CORE

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Acoustic black hole (ABH) is a well-established phenomenon in the field of acoustic. It consists in confining the vibration in the structure edge by controlling its thickness profile. This paper aims to achieve acoustic black-hole-like phenomenon by implementing a profile gradient instead of a thickness variation. To accomplish this, a composite sandwich beam with a functionally graded core is designed and fabricated. The results are demonstrated experimentally. The core of the sandwich beam is a 3D printed cellular material designed following a Voronoï architecture. The property gradient is implemented by varying the size of the cells in the longitudinal direction. The beam is tested in a forced vibration setup, in a clamped-free configuration, under chirp excitation. The 8 first modes of this structure are compared to a finite element model. The presence of ABH-like behavior is demonstrated by monitoring the mode shape of the structure. Some non-linearity and the effect of the electro-dynamic shaker are discussed to explain a shift of modal frequencies between the numerical and experimental values.

Moderators
avatar for Simon Jones

Simon Jones

Associate Professor, Rose-Hulman Institute of Technology
Professional interests include undergraduate engineering education, finite element modeling, ground-borne vibrations, vibrations of musical instruments, and dynamics of toys.
GM

Guilhem Michon

Professor, ISAE-SUPAERO

Authors

Thursday July 11, 2019 10:40 - 11:00 EDT
St-Laurent 7
  T07 Struct. dyn. & nonlin. vib., RS03 Struct ac & vibr