Simplified Measurement Methods for Impact Sound Insulation in Buildings

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dc.contributor.advisor Linzey, M en
dc.contributor.advisor Dodd, G en
dc.contributor.advisor Brown, D en Li, Ming en 2014-10-31T00:45:16Z en 2014 en
dc.identifier.citation 2014 en
dc.identifier.uri en
dc.description.abstract The purpose of this research is to investigate several approaches for simplifying impact sound insulation measurement in high-density housing under field conditions. The best way for examining sound performance is to make field tests in actual buildings. However, for a number of reasons, such as; the difficulty of transporting heavy equipment (e.g. 45 kg at Acoustic Research Centre), long and demanding test periods and the requirement for low ambient noise, measurements designed to comply with the International Organization for Standardization (ISO) Standard 140-7 can be time-consuming and subject to unforeseen factors when carried out at a complicated construction site. For the reasons stated, the field measurement of impact sound insulation can therefore be expensive and is not an attractive option in finished buildings. The research investigates the possibilities for simplifying impact sound insulation tests for high-density housing in the field. Firstly, the elimination of the ISO standardized tapping machine is suggested in Chapter 3. An empirical method is proposed, where the impact insulation measurement is inferred from the field measurements of airborne sound insulation using Correction Factor(s) (CF) based on an assumption of a low coincidence frequency and high input impedance for a floor/ceiling structure. The results predicted show good agreement with measurement data both in the laboratory and field, and the reliability of the CF(s) is verified in the laboratory and in field conditions. The simulation method for CF is coded to a computer programme for convenient application. Secondly, as described in Chapter 4, for sound absorption/Reverberation Time (RT) measurement, economies may be achieved by replacing ISO reference source/loudspeakers with a Radiation Box Gear (RBG). In a comparison of sound power levels between the ISO Reference Sound Source (B&K 4204) and the RBG, the RBG shows significantly better results. The RBG, the new source, is compared with the traditional airborne source for measuring the sound absorption coefficient according to ISO 3741 and 354. The RBG results show good agreement with conventional methods. Thus the novel prototype could possibly perform as a powerful airborne source as a substitute for the ISO reference source/loudspeaker and amplifier. Moreover, as shown in Chapter 5, in order to verify whether the simplified methods in the field can produce results similar to those of full measurement in the laboratory, the uncertainty budget of field tests of impact sound is investigated. The uncertainty of measurement for impact sound insulation was investigated by the comparison of the normalized impact sound pressure levels with a measured frequency from 50 Hz to 5 KHz under two categories consisting of the laboratory technique ( ISO 140-6) and the field method measurement method (ISO 140-7) on 26 floors with four floor conditions; in addition, the single rating comparison under two test systems was included for a study of variations in field conditions. Furthermore, in order to promote the ISPL, which has been suggested as an alternative to replace L‘n, the current ISO rating system for impact sound insulation at low frequencies (as suggested by LoVerde), the Repeatability of Impact Sound Pressure Level (ISPL) is proposed over the frequency range 50 Hz to 5 KHz (enlarged frequencies) using 26 floors with three types of floor covering in field conditions; the tolerance is to be derived. The repeatability of ISPL is proposed as a supplement for impact sound insulation assessment. Finally, considering factors in the repeatability tests above and also those outlined in Chapters 3 and 4, variations are summarised as a spreadsheet of uncertainty budget for the field measurement of impact sound insulation. In conclusion, simplified methods for the field measurement of impact sound insulation that have been developed can be achieved efficiently and at low cost without significantly decreasing the recommended measurement accuracy required by ISO Standards. These will be beneficial in buildings verified as being high-density, and the methods suggested will also make practicable a planned acoustic quality rating for dwellings. en
dc.publisher ResearchSpace@Auckland en
dc.relation.ispartof PhD Thesis - University of Auckland en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri en
dc.rights.uri en
dc.title Simplified Measurement Methods for Impact Sound Insulation in Buildings en
dc.type Thesis en The University of Auckland en Doctoral en PhD en
dc.rights.holder Copyright: The Author en
dc.rights.accessrights en
pubs.elements-id 459682 en
pubs.record-created-at-source-date 2014-10-31 en

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