VIBROACOUSTIC RESPONSE OF A THIN CYLINDRICAL SHELL EXCITED BY A TURBULENT INTERNAL FLOW: COMPARISON BETWEEN NUMERICAL PREDICTION AND EXPERIMENTATION

摘要

The main aspect of this work is to establish a comparison between the measured and the modelled vibroacoustic response of a thin cylindrical pipe excited by a turbulent internal flow. The first part presents the experiment. A Corcos-like model of the wall pressure fluctuation is proposed. The vibroacoustic response of the shell is measured. A numerical method based on a boundary integral formulation and a matched asymptotic expansion is developed. Computed spectral densities of the velocity of and acoustic sound pressure radiated by the shell are compared with experimental results. The comparison shows an agreement within a few decibels.