| Vibration of power plant is the main reason for warship vibration, and the power plant reliability directly influence on battle ability of warship. 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. The composite laminate materials have the properties of weight-light, vibration-resistance, fatigue- resistance, etc. With their distinctive superiority, it will be found widely used in fields of shipbuilding. So this paper emphasis on dynamical characteristics of composite laminate power plant foundation of warship.Based on the first-order shear deformation theories of composite laminate plate, the finite elements equation of composite laminate is established, and the natural frequency and the mode shape of composite laminate foundation are calculated by using computer code. According to the results, the expression of transfer-point mobility and driving-point mobility can be obtained. Then the dynamic model of vibrational isolation system was established through the electrical-force-sound ways. It can be obtained the value of power flow that transmits into the supporting.The models of ship ballast pump foundation are calculated in this paper. Supposing the ballast pump foundation adopts same structures and different materials, then the mode characteristics and the power flow transmit into the ballast pump foundation of the two models are compared.From the results, we can see that the influences of foundation material for natural frequency and mode shapes are not obvious. Whereas when ballast pump fixes on the ballast pump foundation, the mode shapes are changed. If the ballast pump foundation uses material of composite laminate, it is positive to vibration-isolation in low frequency, but in high frequency the effect on vibration-isolation disadvantage.
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