Acoustic radiation from flexible cylindrical shell structure of a vibration isolation system

This paper studies acoustic radiation from flexible cylindrical shell structure of a vibration isolation system due to internal excitation sources. The vibrations of excitation sources are transmitted to the cylindrical shell with internal plate through isolators, and then partially radiated from the flexible cylindrical shell structure into the acoustic medium as sound. An approach of combining the rigid body theory and improved Fourier series method is proposed to model the single-stage isolation system mounting on cylindrical shell with internal plate. By using the Rayleigh-Ritz method, the forced responses of vibration isolation system are obtained, and the radiated acoustic pressure from the cylindrical shell to exterior space is evaluated by employing the Kirchoff-Helmholtz integral equation. Based on this, the acoustic radiation characteristics of the flexible coupled structural system are investigated through several numerical examples.