The pulsating force makes a buzzing noise because the parts of the fan are periodically distorted by the force.
2.
The result is the elimination of two of the main negative phenomena vis-?vis the typology of skyscrapers : the excess static caused by the asymmetry of traditional structures of rectangular design, where the pressure of the wind is highest on the long side and lowest on the short one and the Von Karman effect typical of cylindrical structures which provokes a sinusoidal whirlwind and consequently lateral pulsating forces.
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