On sound transmission through double-walled cylindrical shells lined with poroelastic material Comparison with Zhous results and further effect of external mean flow》.pdfVIP

Journal of Sound and Vibration 358 (2015) 192 –198 Contents lists available at ScienceDirect Journal of Sound and Vibration journal homepage: /locate/jsvi Discussion On sound transmission through double-walled cylindrical shells lined with poroelastic material: Comparison with Zhous results and further effect of external mean flow Yu Liu n, Chuanbo He Department of Mechanical Engineering Sciences, University of Surrey, Guildford GU2 7XH, UK a r t i c l e i n f o a b s t r a c t Article history: In this discussion, the corrections to the errors found in the derivations and the numerical Received 27 March 2015 code of a recent analytical study (Zhou et al. Journal of Sound and Vibration 333 (7) (2014) Received in revised form 1972–1990) on sound transmission through double-walled cylindrical shells lined with 8 July 2015 poroelastic material are presented and discussed, as well as the further effect of the Accepted 10 July 2015 external mean flow on the transmission loss. After applying the corrections, the locations Handling Editor: D. Juve Available online 28 August 2015 of the characteristic frequencies of thin shells remain unchanged, as well as the TL results above the ring frequency where BU and UU remain the best configurations in sound insulation performance. In the low-frequency region below the ring frequency, however,