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فرکانس نوسان
In one of the most recent studies on an elastically mounted cylinder which was free to vibrate in CF direction, Blevins [30] checked the effect of damping ratio on amplitude response, frequency responses (oscillation frequency, fo, normalised by natural frequency vs.
Such trajectories require that the ratio of the IL to CF oscillation frequencies be 2:1.
These highly repetitive trajectories affirm a 2:1 oscillation frequency ratio and illustrate how the shape of these trajectories varies from perfect Fo8 at lower branch to a crescent shape at super upper branch which is associated with 2T vortex modes and strong lift force third harmonic components.
Under this dual resonance, the frequencies of the unsteady drag and lift forces are resonantly tuned with the oscillation frequencies (fox and foy) of the
This model, in addition to classic common VIV characteristics and phenomena, such as being self-exciting and self-limiting and lock-in phenomenon, should be able to capture the parameters such as f* (and behaviours such as Fo8 trajectories, 2:1 oscillation frequency ratio and dual-resonance) which belong to (and are caused by) simultaneous CF/IL oscillations.
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