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مکانیک::
تشدید مضاعف
2.3.2.3 Effects of frequency ratio and dual resonance
[77] further highlighted various figure-of-eight patterns in different subcritical and supercritical Reynolds number (Re) ranges (1.5x104 < Re < 6x104 and 3.2x105 < Re < 7.1x105) and described a figure-eight occurrence as a representation of "dual resonance".
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
They showed dual resonances in all f* cases and illustrated how the oscillating drag component is maximized when f* = 2 with the appearance of the P+S vortex wake mode associated with the maximum in-line response.
Via such models, it is aimed to capture and explain the aforementioned experimentally observed behaviours, such as dual resonances, higher harmonics, jump and hysteresis, transition between travelling and standing waves, multi and single-mode lock-in conditions, mean drag amplifications and influential hydrodynamic coefficients, as much and accurate as possible.
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