Vibratory Emission can occur directly when leading vibration directly into the foundation (solid-borne sound), but also by air-borne sound (infrasound) resulting from large surface vibratory machinery. That is why vibration deletion is focused always by interVIB engineers. In advance during the first calculations the interVib engineers provide the customer with all static and dynamic loads.
Counter frames with coil springs underneath the actual vibratory equipment will reduce the solid-borne sound. The working springs are not connected to foundation directly the coil springs of the counter frame will compensate the frequency. Many times the geological soil properties are not known exactly or after long rain periods the ground water level rises. This influences the vibration transfer and the resonance frequency might be met in a neighbor building. A first step is to change the revolution speed of the drives by a frequency converter, if a counter frame was not the choice in advance.
Also building the Vibratory Conveyor with a two mass system from the very beginning reduces the solid-borne sound massively from the very beginning.
Infrasound is a non-audible oscillation travelling through the air. It is underneath 20Hz and can occur from large surface vibratory machines, when meeting the resonance frequency of the room. It can excite human’s organs resulting a sickish feeling of unknown origin. This kind of oscillation can travel several 100m and can occur maybe in next building.
Building an acoustic booth or changing the revolution speed of the drives can solve this issue.
Conscientious calculations in advance and choosing the best possible solution many of these issues can be deleted previously – depend on interVib experience.
