Vibration coupling effects between two concentric cylindrical shells with periodic annular plates and entrained fluid

The coupling effects between two concentric cylindrical shells with periodic annular plates as well as entrained fluid are investigated theoretically.A formula for the reactive forces by the annular plates is derived on the assumption that only quasi-longitudinal waves exist in the annular plates and an analytical expression for acoustic radiation from the outer shell is developed.Comparisons of numerical results for infinite two-walled cylindrical shell to measured data for a cabin model are in good agreement.Numerical results are presented for analyzing the characteristics of the loadings due to the acoustic fluid and the periodic annular plates,and their influences on the outer shell's farfield acoustic radiation.