Materials Science and Nanotechnology

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Materials Science and Nanotechnology 44 7897 074717

Vortex Physics Open Access Journals

When air flows close to an object, there is a range of flow velocities for which a von Karman vortex environment is formed. The shedding of these vortices imparts a cyclic force on the object. The force is quite small and not sufficient to accelerate the object to any significant amount, particularly if the object is comparatively massive. If the situation is such that the object can oscillate about a fixed position, we have the existence of simple harmonic motion; and if the frequency of the periodic driving force matches the natural frequency of the oscillation, then resonance get. The rate of motion is continuously adaptable, provides linear velocities from "very slow" up to about 15 m/s. The wires are put low tension so that their fundamental frequency of vibration is about 120 Hz. When the vortex shedding relative frequency matches one of the higher harmonics of the wires.

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