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

Abstract

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.

Keywords

Floor impact sound Modal overlaps Rotating machine Sound pressure level Construction standard regulation

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References

Housing Construction Standard Regulation [Amended 2006.1.6 Pres. Decree 19263] and Apartment Housing Floor Impact Sound Insulation Arrangement Certification & Management Standards (MLTM Notification 2005-189).

KS F 2810-2: Field measurement of impact sound insulation of floors - Part 2 method using standard heavy impact sources, Korean Standards , 2002.

Joo MK , Park JY , Oh YK , Yang GS : A study on the measurement method for improvement of reliability for heavy-weight floor impact sound measurement: J Acoust Soc Korea 2008;27(4):1-8.

Joo MK , Han MH , Oh YK : Deviation of sound pressure level in receiving room according to the heavy-weight floor impact sources and its positions: J Korea Inst Eco Arch Environ 2009;9(4):23-28.

ISO 140-1: Measurement of sound insulation of elements - Part1: Laboratory test facilities. International Organization for Standardization , 2005.

ISO 3741: Acoustics-Determination of sound power levels of noise sources using sound pressure-Precision methods for reverberation rooms, International Organization for Standardization, 1999.

Hopkins C. , Turner P. : Field measurement of airborne sound insulation between rooms with non-diffuse sound fields at low frequency: Appl Acoust 2005;66:1339-1382.

Oh YK , Joo MK , Park JY , Kim HK , Yang GS : Deviation of heavy-weight floor impact sound levels according to measurement positions: J Acoust Soc Korea 2006;25:49-55.

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