PREDICTING STRUCTURE-BORNE NOISE FROM BUILDING SERVICE EQUIPMENT USING THE IMPACT NOISE CALCULATION MODEL

摘要

This paper describes a way of predicting structure-borne noise from building service equipment following the same approach as for impact noise, assuming both equipment and taping machine acting as force sources, i. e. being installed on heavy building elements. Indeed, European standard EN 12354-2 includes an equation relating the normalized impact noise level of floors to the force level of the standard tapping machine. Knowing the difference between the equivalent blocked force level of the equipment considered - measured according to EN 15657 - and the force level of the standard tapping machine, it is then possible to use standard EN 12354-2 to predict equipment noise in situ, the impact noise result being corrected of the above force level difference. For horizontal supporting elements, databases of normalized impact sound pressure levels already exist; these data bases are also valid for vertical elements made of the same material (concrete for example). For other types of vertical building elements, e.g. masonry walls, the normalized impact sound pressure level must be measured. In this paper, the use of a vertical tapping machine is tested and the prototype characterized in terms of equivalent blocked force level. Results are presented and compared to the blocked force level of the standard tapping machine.