Noise Transmission Through Profiled Metal Cladding Part II: Single Skin SRI Prediction

Abstract

This paper follows from an earlier experiment investigation¹ on the sound reduction of single skin, trapezoidal profiled cladding systems, paying particular attention to the pronounced “dips” in the SRI at mid frequencies. Theoretical predictions were made to confirm the previous experimental findings. Finite element analysis was used to examine the vibration modes of the profiled cladding. The boundary element method was used to investigate the radiation efficiency of the vibration modes and their excitation by acoustic plane waves. Good agreement with measured vibration data was found. An analytical method for predicting the sound reduction index of single skin profiled cladding systems is proposed and is shown to compare well with measurements on all 15 cladding systems used in the experiment work. An empirical prediction model is also compared.

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