Experiments were preformed to investigate the effects of micro-arc oxidation coating technology, nitrification technology and plasma spray technology on Ti6Al4V alloy. The morphologies on both exterior and section of the processed surfaces were analyzed. Characteristics of treated layers like thickness, hardness, roughness and friction coefficient were also studied and compared. The results show that these technologies can improve the surface hardness and friction coefficient by different degree, but also will destroy the smoothness.

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An approach of combining the rigid body theory and improved Fourier series method is proposed to model the single-stage isolation system based on an elastic plate-shell coupled structure, and the isolation performance is investigated. Considering the practical problems of the machinery system design in the field of marine engineering, the influences of various structural parameters on the isolation performance for the isolation system is implemented. The numerical simulation results are given and discussed.

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