Contribution to uncertainty of in-situ airborne sound insulation measurements

摘要

The objective of this paper is to investigate the uncertainty of in situ airborne sound insulation measurements. A large set of field data has been used to perform individual uncertainty calculations curves using a GUM based approach (ISO Guide to the Expression of Uncertainty in Measurement). Based on these results, the uncertainty of various single number ratings including different frequency ranges has also been estimated. It has been observed that extending the evaluation frequency range from 100-3150Hz to 50Hz-5000Hz does affect the uncertainty of single number quantities (SNQs). Some other effects, such as background noise effect and difficulty to measure reverberation time at low frequencies are also discussed.