In the previous investigations of the vibroacoustic characteristics of a submerged cylindrical shell in a flow field, the fluid viscosity\nwas usually ignored. In this paper, the effect of fluid viscosity on the characteristics of vibration power flow in an infinite circular\ncylindrical shell immersed in a viscous acoustic medium is studied. Fl¨uggeâ??s thin shell theory for an isotropic, elastic, and thin\ncylindrical shell is employed to obtain the motion equations of the structure under circumferential-distributed line force. Together\nwith the wave equations for the viscous flow field as well as continuity conditions at the interface, the vibroacoustic equation of\nmotion in the coupled system is derived. Numerical analysis based on the additional-damping numerical integral method and tenpoint\nGaussian integral method is conducted to solve the vibroacoustic coupling equation with varying levels of viscosity. Then,\nthe variation of the input power flow against the nondimensional axial wave number in the coupled system with different\ncircumferential mode numbers is discussed in detail. It is found that the influence of fluid viscosity on the vibroacoustic coupled\nsystem is mainly concentrated in the low-frequency band, which is shown as the increase of the crest number and amplitude of the\ninput power flow curves.
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