Abstract
This paper investigates the vibro-acoustic problems of an elastic compartment structure (wheel house) belonging to a ship, coupled to the enclosed air. The excitations from the structural walls of the room by the sound source cause vibrations throughout the system and noise within the acoustic domain. Due to the coupling between the structural vibrations and acoustic pressure field, these systems are typically referred to as vibro-acoustic systems. The acoustic excitations and vibrations on the structural walls of a ship structure, however, are significantly larger and have a much more significant effect to the structural integrity of the ship. In order to determine whether coupled responses are needed, three frequency analyses have been performed: calculus of the first 5 natural frequencies of the fluid separately, the structure separately, and the fluid-structure coupled system. The wall thickness of the room walls is of 5 mm and made of layered composite. The stress analysis of the model at a highly participating structural mode is performed.
Highlights
The noise is one of the most important pollution parameter for many industries
The ship structure vibrations can be caused by various sources, such as engines, generators, rotating systems, interaction of water from propeller that hits the aft part of the ship
Because the interior noise dynamic behaviour of each of the both sub-systems is affected by the behaviour of the other one, the reciprocal actions between air and ship hull structure is transformed into a complex phenomenon
Summary
The noise is one of the most important pollution parameter for many industries. In ship transport, especially in the case of passengers ships the interior noise is a criteria imposed by classification societies rules. To reduce time and effort for the ship interior noise analysis, it is usual to perform the related work during the design stage. The phenomenon of interior noise represents the fluid-structure interaction (coupling between ship structural vibrations and air pressure fluctuations in the interior of a compartment), when the energy exchange between the acoustic sub-system and structural sub-system is performed. The vibro-acoustic analysis is very important especially in the case of elastic structures. The designers work to avoid resonances (or near resonances) that produce large dynamic displacements of the elastic structures and variations of pressures of surrounding air (noise). The problem is decoupled since the boundary element method is used to solve the pressure response of an interior domain
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