Vibro-acoustic analysis of submerged ring-stiffened cylindrical shells based on a symplectic wave-based method

摘要

A symplectic wave-based method is applied to the vibro-acoustic problems of submerged ring-stiffened cylindrical shells, accounting for the effects of hydrostatic pressure and acoustic-structure interaction. The symplectic wave-based method combines the symplectic state space theory with the traditional wave propagation approach, and shows the characteristics of high precision and high numerical stability. However, this method is only applied to the vibration analysis of relatively simple and geometrically regular structures before. In this paper, the method is extended to the acoustic vibration analysis of general ring-stiffened cylindrical shells, in which numerical integration strategies are adopted to deal with unknown acoustic-structure coupling terms, finally a complete coupled vibro-acoustic analysis is realized. A further quantitative investigation clearly reveals the effects of hydrostatic pressure on the vibration and acoustic responses. Compared with the existing methods, the present method shows better convergence and accuracy properties, especially when the stiffening rings are dense. It is also shown that hydrostatic pressure cannot be ignored in the acoustic radiation analysis if the low-frequency near-field acoustic pressure is concerned, otherwise, it can be ignored.