Abstract
Air handling units (AHU) mounted on elevated floors in old and new buildings can create floor vibrations that transmit through the building structure to perturb nearby occupants and sensitive equipment such as electron microscopes. Vibration sources include rotating fan imbalance and air turbulence. Isolation springs and the deflecting floor then create a two degree of freedom system. The analysis discussed here was originally published in “Sound and Vibration,” October 1987, pp. 26–30. Analysis parameters will be discussed along with inertia block affects and spring design strategy for floors of finite mass.
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