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Wednesday, July 10 • 17:10 - 17:30
FORMATION OF VIBRATION ATTENUATION IN PLATE BY INSERTING ACOUSTIC BLACK HOLE INDENTATIONS WITHOUT DAMPING LAYER TREATMENT

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The Acoustic Black Hole (ABH), which possesses unique characteristics of vibrational energy focalization and structural damping enhancement, is employed to achieve broadband vibration control. Application researches based on finite plate structure with embedded multiple ABHs are carried out to break through the restriction of single ABH and indicate that low-order ABH modes contribute to low frequency performance. However, most of these researches focused more on the damping properties of ABH cell itself after coupling damping. In this study, the damping properties of finite plate with a few ABHs below the characteristic frequency of ABH element are investigated from attenuating vibration perspectives while leaving the damping layer treatment out of account. Finite element analyses results show that the considered finite plates with a few ABHs could achieve vibration attenuation based on unique ABH modes. With the number of ABH cell increasing, broadband attenuation feature is improved below the characteristic frequency. Investigations are conducted to explain the attenuation performance of considered ABH plates based on modal superposition theory. With fixed number of ABH cell, the placement of ABH cells is also considered and research results indicate that the vibration attenuation occurs at diverse frequency when the layout of ABH indentations varies.

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
avatar for Li Cheng

Li Cheng

Chair Professor, Hong Kong Polytechnic University


Wednesday July 10, 2019 17:10 - 17:30 EDT
St-Laurent 7
  T07 Struct. dyn. & nonlin. vib., RS03 Struct ac & vibr