Influence of potential function asymmetries on the performance of nonlinear energy harvesters under white noise

Qifan He, Mohammed Daqaq

    Research output: Contribution to journalArticle

    Abstract

    To improve the broadband transduction capabilities of vibratory energy harvesters (VEHs) under random and non-stationary excitations, many researchers have resorted to purposefully introducing nonlinearities into the restoring force of the harvester. While performing this task, it is often very challenging to maintain a perfectly symmetric restoring force which yields a VEH with an asymmetric potential energy function. This paper investigates the influence of potential function asymmetries on the performance of nonlinear VEHs under white noise inputs. To that end, a quadratic nonlinearity is introduced into the restoring force and its influence on the mean output power of the harvester for mono- and bi-stable quartic potentials is investigated. It is shown that, for VEHs with a mono-stable quartic potential function, the mean output power increases with the degree of potential function asymmetry. On the other hand, for energy harvesters with a bi-stable quartic potential function, asymmetries in the restoring force appear to worsen performance especially for low to moderate noise intensities. When the noise intensity becomes sufficiently large, the influence of the potential functions asymmetry on the mean power diminishes. Results also reveal that a VEH with a symmetric bi-stable quartic potential function produces higher mean power levels than the one with the most asymmetric mono-stable potential. As such, it is concluded that a VEH with a symmetric bi-stable potential is most desirable to improve performance under white noise.

    Original languageEnglish (US)
    Pages (from-to)3479-3489
    Number of pages11
    JournalJournal of Sound and Vibration
    Volume333
    DOIs
    StatePublished - Jan 1 2014

    Fingerprint

    Harvesters
    White noise
    white noise
    asymmetry
    energy
    noise intensity
    nonlinearity
    Potential energy functions
    output
    potential energy
    broadband

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Acoustics and Ultrasonics
    • Mechanics of Materials
    • Mechanical Engineering

    Cite this

    Influence of potential function asymmetries on the performance of nonlinear energy harvesters under white noise. / He, Qifan; Daqaq, Mohammed.

    In: Journal of Sound and Vibration, Vol. 333, 01.01.2014, p. 3479-3489.

    Research output: Contribution to journalArticle

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