The nonlinear dynamics of flexural ultrasonic transducers

Andrew Feeney, Lei Kang, George Rowlands, Steve Dixon

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

    Abstract

    Dynamic nonlinearity can manifest as changes in characteristic properties of a vibrating system in response to variations in excitation. This study investigates the nonlinearity in the vibration response of the flexural ultrasonic transducer. This device is typically employed for industrial measurement, but little is known about the influence of changes in excitation on its dynamics. In general, the resonance frequency of an ultrasonic device is known to shift as excitation amplitude is increased, displaying either hardening nonlinear behaviour, where resonance frequency increases, or softening associated with resonance frequency decrease. In typical operation, the vibration response of the flexural ultrasonic transducer has been found to be weakly nonlinear. Different physical mechanisms can cause nonlinearity, including structural configuration, the physical responses of components such as the transducer membrane, and thermomechanical properties inherent in piezoelectric materials. The nonlinear behaviour of flexural ultrasonic transducers is shown in the context of typical operation in practical application, through laser Doppler vibrometry and supported by fundamental mathematics.

    Original languageEnglish
    Title of host publication2019 International Congress on Ultrasonics
    PublisherAcoustical Society of America
    Number of pages5
    DOIs
    Publication statusPublished - 24 Feb 2020
    Event2019 International Congress on Ultrasonics, ICU 2019 - Bruges, Belgium
    Duration: 3 Sept 20196 Sept 2019

    Publication series

    NameProceedings of Meetings on Acoustics
    PublisherAcoustical Society of America
    Number1
    Volume38
    ISSN (Print)1939-800X

    Conference

    Conference2019 International Congress on Ultrasonics, ICU 2019
    Country/TerritoryBelgium
    CityBruges
    Period3/09/196/09/19

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