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Abstract
The metrological accuracy on acoustic field measurements of buildings is a current issue that needs extensive discussion due to the fact that the variables involved may challenge their results. In this sense, this paper analyzes the uncertainty of field measurements of impact noise. The focus of the study is the analysis of the influence of equipment positioning. The measurements were performed according to ISO 140-7 and ISO 140-14 standards in two rooms, one above the other, separated by a 10 cm massive concrete slab. Two groups with different positions of the tapping machine and the microphone were considered: minimum distance of the walls defined by ISO standards and centralized points on the floor. The variations in the positioning of the equipment generated 64 results of sound levels in the reception room, divided into four groups of results, from measurements in the frequency range between 100 and 3,150 Hz. The methods used were based on ISO 12999-1 standard and RELACRE/Portugal Guide, which express the uncertainties of acoustic measurements in buildings in different ways. The results are presented as examples of the application of previously tested floor systems with different acoustic behaviors and, consequently, with different weighted normalized impact sound pressure level of the measured values corrected by the estimated uncertainty. In this study, it was demonstrated and quantified the influence of equipment positioning on the results of field measurements of impact noise in floor systems.
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