Fluid-solid Interaction Vibration Analysis Between The Ship Main Engine And The Double Bottom

In fact, all structures are in an environment of vibration which are vibrating with their shape. The vibration not only blocks the system's power, but also makes troubles to manipulators' healthiness and produces environment pollution. The dynamic characteristic and design of system must be analysed to satisfy the request of low vibration and low noise of the structure.The ship's vibration and noise problem is one of the main work of the vibration research. Now, the whole ship's dynamic characteristic has been studied mostly. But, the details' modal analysis is not integrated. The engine cabin is the heart in all cabins of the ship, the double bottom in the engine cabin has many separate cabins. The liquid in the separate cabins may influence the vibration characteristic of the double bottom, connecting the fluid-solid interaction vibration between the ship main engine and the double bottom.International and native research which results on the coupling vibration analyses is summarized firstly in this paper. Then, the fluid-solid interaction vibration of the ship double bottom is enduced. Based on the mode analysis theory, and systematically applying the finite element method (FEM) and considering the problem of improving accuracy and reducing the caculation complexity, the finite element model of the double bottom is built with ANSYS software. This work offers a foundation for the dynamic response calculation, the dynamic characteristic analysis of the ship double bottom and optimization in structural design. This method used in this paper emphasizes the unite of theory and practice, it's an universal method in vibration engineering, which makes sure the correctness of this paper.The dynamic characteristics of the ship double bottom and the influence of different water depth to the double bottom are studied by this paper. The dynamical characteristics of fluid-solid interaction vibration of the double bottom are discovered by this study. It is important to know the vibration characteristic of the fluid room's fluid-solid interaction. In practice, we should consider the variety of the vibration characteristic between fluid and solid, trying to increase the different between the natural frequency and prompting frequency, in order to avoid the resonance. The present work may offer guidelines on the dynamical design of double bottom of ship engine room.