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    Volume 26, Issue 3 (September 2003)

    Resonant Column Testing: The Inherent Counter EMF Effect

    (Received 27 August 2001; accepted 18 September 2002)

    Published Online: 01 September 2003


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    The standard magnet-coil driving system in resonant column devices provides the required cyclic excitation; however, it inherently produces a counter electromotive force that opposes the motion. In this study, the resonant column is modeled as an electro-mechanical system to quantitatively examine the counter electromotive effect and to explore its effect on resonant frequency and damping ratio computed from voltage-based measurements. The model is verified with two independent sets of experiments. Experimental and analytical results show that the measurement bias is more pronounced on the damping ratio than on the resonant frequency, the damping bias is not a device constant but varies with frequency, and the error is particularly relevant in low-loss and low-stiffness specimens (such as dry sands at low confinement). The electro-mechanical model permits developing device-specific correction charts that can be used to reexamine previously published damping ratio data gathered with voltage-based resonant column procedures.

    Author Information:

    Wang, Y-H
    Assistant professor, Civil Engineering, Hong Kong University of Science and Technology, Hong Kong,

    Cascante, G
    Associate professor, Civil Engineering, University of Waterloo, Waterloo,

    Santamarina, JC
    Professor, Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA

    Stock #: GTJ11305J


    DOI: 10.1520/GTJ11305J

    Title Resonant Column Testing: The Inherent Counter EMF Effect
    Symposium ,
    Committee D18