Abstract
Noise immissions with predominant low frequency sound components may
exert considerably disturbing effects in dwellings. This applies
in particular to sounds which are excitated by transmission of structure-borne
noise, and to low frequency sounds emitted by ventilators. Exposed
persons usually declare such immissions as being "intolerable" even
at very low Aweighted sound levels. If mechanical vibrations in
the frequency range below 20 Hz (ground-borne vibrations) affect
dwelling rooms, the annoying effects are perceived only by a small
portion of exposed individuals as a physical effect. For the most
part the immissions are observed as vibratory effects on the building
and on objects inside the dwelling. The disturbing effects of vibration
frequencies above 20 Hz (structure-borne sound) are determined by
the airborne sound field generated inside a particular room and its
given surface and extension.
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