Vibro-acoustic characteristics of cylindrical shells with complex acoustic boundary conditions

• Expression of acoustic radiation function of cylindrical shell structure in a quarter-infinite domain is derived.
• Verified the validity of double reflection method in complex acoustic boundary conditions for cylindrical shell structure.
• Proposed method is verified by coupling finite element method and boundary element method.

The structural–acoustic radiation problem of cylindrical shell structures with complex acoustic boundary conditions is investigated in the present study. The structural–acoustic radiation problem of a cylindrical shell is solved by using the double reflection method, in which the acoustic boundary conditions consist of a free surface and a rigid wall surface. The expression of the acoustic radiation function is also derived for cylindrical shell structures in a quarter-infinite acoustic domain. Finally, the influence of the acoustic radiation power and the acoustic directivity caused by the acoustic boundary characteristics, the acoustic source location, and the radiation frequency in a thin cylindrical shell structure is discussed. Thus, the results provide a new method to analyze the acoustic radiation problem with complex acoustic boundaries.