Simulation And Experimental Investigation Of Mechanical Property Of Multilayer Corrugated Steel Plate Isolator

Research have shown that the hull vibration is one of the prime reasons which cause the failure of the ship parts, and the influence of the power system on the hull is most pronounced, therefore, it is particularly urgent to control the vibration of the power system. Multilayer corrugated steel isolator, which is based on the dry friction damping theory and have the advantages of simple structure, relatively lower vibration transmissibility, preferable environment adaptability and the significant damping effect, is suitable for ship engine’s vibration reduction. Under the support of a project funded by CSIC 703 institute, the mechanical properties of the multilayer corrugated steel isolators, which bear one-way axial load and with different structure parameters, are obtained by simulations and experiments. And the feasibility of applying multilayer corrugated steel plate vibrator to ship power system for isolation is proved in this paper.In this paper, different types of corrugated steel plates are designed, and the multilayer corrugated steel plate isolator is assembled after the formulated cold stamping and heat treatment process. The mathematical formula of the energy dissipation coefficient of the isolator is deduced by the mechanical analysis of different corrugated types of isolator. The hysteresis loops of the multilayer steel plate isolators with different structural parameters and different deformation amplitudes are presented through the static experiments of isolator. The static performance of multilayer corrugated steel plate isolator are studied by analyzing the effect of thickness, corrugated types and layers of plates to the stiffness and damping characteristics of isolator according to the hysteresis loops. The modified formula of energy dissipation coefficient is obtained by the comparison of theoretical and experimental values.The dynamic performance of multilayer corrugated steel isolator under different structure parameters and external excitations are analyzed according to the dynamic experiment which is divided into sine-swept experiment and the random vibration experiment. The isolation performance parameters of isolator mainly include resonance frequency, transmissibility, damping ratio, root mean square acceleration response, isolation efficiency, etc. They can be calculated on the basis of the frequency response curves and the power spectral density curves of isolator which can be obtained through the sine-swept experiments and the random vibration experiments.The mechanical properties of multilayer corrugated steel isolator with different structural parameters are also analyzed by finite element simulation, including the static simulation, transient simulation, modal simulation and harmonic response simulation. The static characteristics of isolators are analyzed through the static simulation, the stiffness and the stress,strain contours of isolator are obtained; the sinusoidal load response of isolator is analyzed through the transient simulation, the energy dissipation coefficient and the contact state between the layers of steel are obtained; the natural frequency and corresponding modes of isolator are analyzed through modal simulation; the frequency response of isolator is analyzed through the harmonic simulation, and the peak response of isolator is obtained. The results provide the basis for the application of multilayer corrugated steel plate isolator in the ship power system, due to the consistency of the experiment and simulation when comparing the data of them.