Enhanced vibration based energy harvesting using embedded acoustic black holes

L. Zhao, F. Semperlotti, S. C. Conlon

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    6 Scopus citations

    Abstract

    In this paper, we investigate the use of dynamic structural tailoring via the concept of an Acoustic Black Hole (ABH) to enhance the performance of piezoelectric based energy harvesting from operational mechanical vibrations. The ABH is a variable thickness structural feature that can be embedded in the host structure allowing a smooth reduction of the phase velocity while minimizing the amplitude of reflected waves. The ABH thickness variation is typically designed according to power-law profiles. As a propagating wave enters the ABH, it is progressively slowed down while its wavelength is compressed. This effect results in structural areas with high energy density that can be exploited effectively for energy harvesting. The potential of ABH for energy harvesting is shown via a numerical study based on fully coupled finite element electromechanical models of an ABH tapered plate with surface mounted piezo-transducers. The performances of the novel design are evaluated by direct comparison with a non-tapered structure in terms of energy ratios and attenuation indices. Results show that the tailored structural design allows a drastic increase in the harvested energy both for steady state and transient excitation. Performance dependencies of key design parameters are also investigated.

    Original languageEnglish (US)
    Title of host publicationSensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2014
    PublisherSPIE
    ISBN (Print)9780819499875
    DOIs
    StatePublished - 2014
    EventSensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2014 - San Diego, CA, United States
    Duration: Mar 10 2014Mar 13 2014

    Publication series

    NameProceedings of SPIE - The International Society for Optical Engineering
    Volume9061
    ISSN (Print)0277-786X
    ISSN (Electronic)1996-756X

    Other

    OtherSensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2014
    Country/TerritoryUnited States
    CitySan Diego, CA
    Period3/10/143/13/14

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Applied Mathematics
    • Electrical and Electronic Engineering
    • Computer Science Applications

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