A Study on the Method of Measurement of Heavy- Wei ght Floor Impact Sound Considering the Room Mode in Low Frequency Ranges

摘要

Most of receiving rooms for the measurement of floor impact sound have rectangular shapes with couple of meters of dimension, with reflective finishing, no furniture and no curtains. Modal overlaps in those conditions are the major reason for the low reproducibility, and as a matter of course, low credibility in measurement. Especially the standard sound source that is currently being used for measurement of heavy-weight floor impact sounds, would cause many social problems due to the excessive low-frequency energy created, within a range from 63 to 125 Hz, and is difficult to evaluate and measure. To solve this problem, space-time average SPL's through combinations of rotating microphones was suggested in the preceding research. In this study, measurement method using rotating machine and fixed microphones were compared and analysed by the field measurement. The measurement method using rotating machine has good consistencies with average SPL of entire receiving room. This method is expected to reduce the measurement time and measurement deviation as well as to support building regulation/standard development in Korea for Korean apartment buildings.