Masajiro Abe

Guideline of design on coated films with a gradient layer under elastohydrodynamic lubrication conditions

Abstract In recent years, there have been advances in techniques for improving sliding performance by using coated films possessing superior tribological properties to reduce failure of mechanical elements. Those techniques are often used under severe conditions, such as elastohydrodynamic lubrication (EHL). In this paper, to devise the optimum design of a coated film with a gradient layer, the stresses generated in such a coated film are analysed by using a three-dimensional numerical analysis method, and the strength of the film is evaluated numerically. As a result, it is shown that when the ratio of the modulus of elasticity of the coated film, Ec, to that of the substrate, Es, is 0.50, it is preferable to select the gradient layer in which the variation of modulus of elasticity decreases gradually approaching from the substrate to the coated film in the depth direction. Furthermore, it is shown that in the case of Ec/Es=2.00, it is preferable to select the gradient layer varying linearly the modulus of elasticity into the gradient layer.

Optimum Stacking Method based on Fuzzy Systems Theory in Container Terminal.

Container logistics networks need their expansion and the improvement of their efficiency. For this purpose, the container handling carrying system should be optimized in terminals. Then, it is important to reduce the cycle time for container operation. The operation cycle time is effected by machine performance and the arrangement of containers in stacking yard. In this study, the optimum stacking method in the yard is constructed. As the first step, a stacking method based on fuzzy systems theory has been developed. The judgement of container weight and unloading terminal are treated logically for a container. And the optimum location of a container in stacking yard is decided. The container handling applied this stacking method and conventional ones was simulated. The speed and distance of load hoisting, travelling and traversing are considered in this simulation. As the result, this stacking method is superior to convensional ones in shipping operation time.