Abstract
The underwater acoustic radiation of the submarine power cabin has recently become a hot topic in the industry and also in the academia. In this article, the vibration and underwater acoustic radiation of a ring-stiffened conical shell with bases are investigated numerically by means of the combination of the finite element method and boundary element method. The acoustic radiation field is obtained by the traditional acoustic field model and ISO acoustic field model, respectively. A series of numerical examples are given, and the results are compared. Besides, the sound pressure at different positions with frequency is further studied. It is shown that the sound radiated by the structure mainly propagates to the side directions of the shell and propagates relatively less to the front side and the rear side.
Highlights
Fluid-structure interaction of flexible structures is a common phenomenon in both engineering and natural environments [1, 2]
The surface vessels and submarines belong to flexible structure. e power cabin, which is located at the stern, directly determines the vibroacoustic characteristics and level of the whole ship
The vibration of the surrounding fluid will occur and act on the structure as a radiation force, which is called the acoustic-structure coupling problem [6, 7]. e underwater acoustic radiation of the submarine occurs in the complex environment with an interaction of the structural vibration and water medium
Summary
Fluid-structure interaction of flexible structures is a common phenomenon in both engineering and natural environments [1, 2]. E acoustic radiation is caused by the structural vibration. The structural vibration in the fluid medium is quite different from that in air or vacuum. Besides the vibration of structure itself, there is an interaction between the structure and fluid medium. When the structure is excited to produce vibration, the vibration boundary may compress the surrounding fluid to make the vibration propagate outwards in the form of wave, i.e., acoustic radiation. The vibration of the surrounding fluid will occur and act on the structure as a radiation force, which is called the acoustic-structure coupling problem [6, 7]. E underwater acoustic radiation of the submarine occurs in the complex environment with an interaction of the structural vibration and water medium. Us, for underwater acoustic radiation problems, the acoustic-structure coupling effect has to be considered Zou et al [1] pointed out that the interaction belongs to a strong coupling problem, which could not be neglected. us, for underwater acoustic radiation problems, the acoustic-structure coupling effect has to be considered
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