It has been found that the oscillatory flow which generates aeolian tones when a wire is exposed to a steady wind may adjust itself to the resonant frequency of the wire, if it is flexible, over a speed range up to 10% or so in the experiments reported. The tone is then very steady and relatively strong. On each side of this range are regions where the frequency is unsteady, lying between the resonant one and the fixed-wire aeolian tone.
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Powell et al. (1962) studied this question.