Study Of Ship Power System Isolation Technology

Raft vibration-isolating unit is an effective device that can isolate the transmission of vibration and reduce structure noise to the base.It need to be designed base on the specific ship and the specific power equipment.Study of this theses is the isolation of power equipment on submarine.With theoretical and computation study,the factors influencing the effect of vibration-isolating are analyzed completely in this paper.Double-staged vibration isolator unit has been compared with single-staged one,its deliver ingrate of force and a group of parameter curves have been obtained based on the characteristics of attenuation and stability.Analysis show the ratio of the delivering rate of the former is in direct proportion to 1/ω~4 when frequencies are higher than second-harmonic vibrator but that of the latter is in direct proportion to 1/ω~2.So the ratio of attenuation of double-staged vibration isolator system is bigger and the superiority of the double-staged isolation and floating raft isolation is fully incarnated.Though we use the large rigid double-staged isolation instead of the weak single-staged isolation system,so we_can get a well isolation efficiency and make a compromise of attenuation and stability.The mechanical model of floating raft is founded and the differential equation is deduced.Moreover,aiming at reducing the isolation transmission of the systemic structure oscillation,in terms of the functional parameters of isolators,the dynamical properties of floating raft system acted by oscillator is analyzed.By the optimization of dominating structural parameters,the approach achieving good vibration isolation features is discussed.So that a series of conclusions valuable in engineering are derived by the studies of theory.Then,a submarine power cabin model equipped with a floating raft is designed.The finite element analysis is carried out with MSC.Patran and MSC.Nastran software and the performance of vibration isolation system equipped with the floating raft installation is investigated.