Energy focusing effect of Two-dimensional acoustic black hole on flexural waves

Wei Huang, Hongli Ji, Jinhao Qiu, Li Cheng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)

Abstract

All right reserved. The acoustic black hole (ABH) phenomenon in thin-walled structures with a power function form reducing leads to a smooth reduction of the phase velocity of flexural waves and energy focalization. In an ideal case, flexural wave velocity decreases to zero so that it never reaches a structure's edge, much less reflects back. This causes structural areas with high energy density, the high energy effects can be used for various engineering applications, such as, energy harvesting, vibration and noise control and so on. In order to investigate the energy focusing effect of two-dimensional acoustic black hole on flexural waves, the model of two-dimensional acoustic black hole was built using the finite element software ABAQUS, and numerical simulations were conducted for the transmission of flexural wave in the acoustic black hole areas. Vibration power flow and finite element simulation were combined to analyze the energy focalization of flexural waves. Finally, the transmission process of flexural wave in two-dimensional acoustic black hole was imaged and analyzed by using the laser ultrasonic scanning technique. The test results verified the energy focalization effect of two-dimensional acoustic black hole on flexural waves.
Original languageEnglish
JournalZhendong yu Chongji/Journal of Vibration and Shock
Volume36
Issue number9
DOIs
Publication statusPublished - 15 May 2017

Keywords

  • Acoustic black hole
  • Energy focalization
  • Finite element analysis
  • Flexural wave
  • Power flow

ASJC Scopus subject areas

  • Mechanics of Materials
  • Acoustics and Ultrasonics
  • Mechanical Engineering

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