Ratings and classifications for high-frequency impact noise isolation
* Presenting author
A two-rating method of evaluating impact noise isolation has been proposed by two of the authors [LoVerde and Dong, J. Acoust. Soc. Am. 141, 428 (2017)], in which low and high-frequency components are evaluated independently. Numerous other researchers have investigated the issue, and although the details differ, there has been some convergence of ratings and classifications for low-frequency impact noise. For the high frequencies, most have assumed that the existing IIC/Ln,w ratings are appropriate, while the authors have proposed high-frequency ratings which are based on the existing ratings but with a limited frequency range of 400-3150 Hz. Analysis of impact data from floor assemblies common to North America shows that the proposed ratings evaluate high-frequency impact sources and mitigation measures better than the existing ratings. The analysis is extended to include data from German floor systems and heavyweight and lightweight stairs. The ratings are compared and possible classifications are suggested.