No abstract

The traditional craft of marine launching rubber gasbag that made by hand laying cord fabric has the disadvantages of irregular reinforcing direction and discontinuity of cord, which leads to the limitation of bearing capacity of gasbag and poor reliability. Based on the analysis of the structure of the rubber gasbag and geodesic winding pattern used in marine launching, the winding process design and experiment of the fiber reinforced rubber gasbag are carried out to solve the problem. The numerical simulation of the wound rubber gasbag is established by the finite element software ABAQUS in order to study the geometrical and contact nonlinearity of the gasbag, and the nonlinear relationship of parameters in application process, and then compare the application performance with those of the traditional cord fabric placement molding. Finally, the winding pattern test and deformation simulation experiment are carried out to verify the fact that the reinforced rubber gasbag with glass fiber / polyurethane composite material has a higher bearing capacity compared with the traditional handmade rubber gasbag. Thus, it provides theoretical and experimental evidence for the winding process of rubber gasbag.

In order to satisfy the collision-resistance requirements for the stiffness and strength of collision-protected spherical structure of marine structure platforms, a new winding strategy for spherical structure was proposed, which can make the thickness distribution of the filament wound layer of the spherical structure relatively even, and the polar opening can be covered by the filament wound layer. In this paper, the filament wound trajectory equation and the approaches for winding parameters design of spherical structures were presented. The influence of different partitions on the thickness distribution of the filament wound layer for spherical structure was analyzed. The optimal partition was adjusted according to the even distribution condition of the filament wound patterns, and the simulation of the new winding strategy of the spherical structure, dry yarn filament wound experiment and the wet filament wound experiment was carried out with adjusted partitions. The results show that when adopting the new winding strategy, the obtained winding pattern is stable. The feasibility of the new winding strategy is verified, which can consequently improve the structural bearing capability of spherical structure.

Abstract.A kind of semi-active hydraulic engine mount is studied in this paper. After careful analysis of its structure and working principle, the FEA simulation of it was divided into two cases. One is the solenoid valve is open, so the air chamber connects to the atmosphere, and Fluid-Structure Interaction was used. Another is the solenoid valve is closed, and the air chamber has pressure, so Fluid-Structure-Gas Interaction was used. The test of this semi-active hydraulic engine mount was carried out to compare with the simulation results, and verify the accuracy of the model. Then the dynamic characteristics-dynamic stiffness and damping angle were analysed by simulation and test. This paper provides theoretical support for the development and optimization of the semi-active hydraulic engine mount.

This paper use plum-blossom tourmaline as anion additive, filled to PET recycling material as modifying agents. Successfully prepared a composite material can release anions. The effect of different percent composition on heat distortion temperature and anion releasing performance of polyester recycled materials were studied, plum-blossom tourmaline powder and fracture surface of polyester/ plum-blossom tourmaline were observed by Transmission electron microscopy (TEM) and Scanning electron microscope (SEM). The result showed plumblossom tourmaline powder particulate could easily gather together and formed roughly 0.6 μm particle cluster, tourmaline evenly dispersed in polyester matrix and had good interface combined performance, the addition of tourmaline improved polyester's heat distortion temperature and anion releasing ability. With the increased of plumblossom tourmaline, the release anions contents also increases. When the content reached 8%, anion average releasing quantity achieved 1458 ions/cm 3 and it reached WHO's required standard. It can improve people's living environment and conducive to resource recycling, it is an economical and environmentally friendly way to reduce environmental pollution.