Numerical Simulation Of Dynamic Characteristics Of Shipboard Foundation

Vibration of power plant is the main reason for ship vibration, and the power plant reliability directly influence on battle ability of ship. Power plant foundation is the base that using to fasten the power plant and transfer the power plant weight and the force arose by engine working to the ship. So the vibration on power plant foundation has been researched extensively by experts. At present, the power plant foundation of is usually the base of the steel welded together on the ship, because the steel is higher in density, thus increasing the quality of the base, and the steel have poor damping properties, not have the characteristics of vibration absorber. Therefore, the new damping materials, instead of using the steel is the effective way to improve the performance of damping.Fiber reinforced composites as the higher strength higher stffness and the well damping characteristics, long fatigue life, the structure can be designed, in its inception, has become a good material to replace steel. However, due to composite material is anisotropic,non-uniformity of conventional metal materials such as the different mechanical characteristics, making it much more difficult and complex on the theoretical analysis, calculation and design.This paper is through numerical simulation analysis technology, instead of damping materials by the composite of steel base of the structure of foundation simulation analysis, through the modal analysis, dynamic analysis, evaluation out of the base of the natural frequencies, natural vibration model and in a variety of load under the conditions of responses. Then, the composite laminated structure to optimize the design, by modifying the angle of two kinds of single-layer thickness and the laying of parameters, get the best damping properties of the base of the structure. Simulation results show that single-layer thickness of 0.15mm, the laying of the angle[0°45°]laminated composite material structure, the base can make the best isolation effect, its coefficient of dynamic response of the vertical direction 1.06,1s time to reduce the amplitude 81.63%.