Free and forced motion in an asymmetric liquid-column oscillator

M. J. Smith, J.J. Kobine, F.A. Davidson

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)


    The results of a combined theoretical, numerical and experimental study of liquid oscillations in an asymmetric U-tube are presented. The configuration under investigation is analogous to that of the tuned liquid-column damper used to suppress oscillatory motion in large semi-supported structures. The liquid motion is described by a second-order ordinary differential equation that is nonlinear when the widths of the two vertical columns are unequal. It is shown that this asymmetry can be used as a tuning parameter to determine the natural frequency of free oscillations in the system, in addition to the known tuning effect of the connecting chamber height. The effects of viscous damping and periodic forcing are considered, leading to a description of probable initial and long-term resonance behaviour in a practical asymmetric device.
    Original languageEnglish
    Pages (from-to)905-922
    Number of pages18
    JournalProceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
    Issue number2092
    Publication statusPublished - 8 Apr 2008


    • Structural damping
    • Tuning
    • Perturbation analysis
    • Nonlinear resonance


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