Advanced Materials Research Vols. 291-294

Abstract: In port crane industry, the surface hardening technique is widely used in order to improve the strength of wheel. But the hardening depth is chosen only by according to the experience, and the effect of different hardened depths is not studied theoretically. In this paper, the contact stresses in wheel with different hardening depth have been analyzed by applying three-dimensional finite element model. Based on this model, the ANSYS10.0 finite element software is used. The elastic wheel is used to verify the numerical results with the Hertz’s theory. Three different hardening depths, namely 10mm, 25mm and whole hardened wheel, under three different vertical loads were applied. The effect of hardening depth of a surface hardened wheel is discussed by comparing the contact stresses and contact areas from the numerical results.

Abstract: This paper designs a dual core structure robot controller, using the resource of FPGA and the method of customizing Nios II dual core processor, which utilizes the openness of SOPC, so that satisfies the requirement of openness and real-time. It designs the software and hardware structure of the controller and carries out relative experiments. The results show that the robot controller system is reasonable and feasible.

Abstract: According to the ventilation and heat issues of Beijing Capital International Airport T3 Terminal Station Transportation Center (GTC), based on the actual conditions of the building structure, geographical location, climate and other characteristics, the internal environment of temperature and other issues are analyzed and researched. And the relationship of indoor air flow and interior space of the building is established. With methods of CFD, and from the perspective of the Energy Saving and Environmental Protection, natural wind and related technology are utilizes, and natural ventilation and heat transferring guidance systems are designed, so that the internal temperature is reduced and the indoor comfort is improved. Introduction Beijing Capital International Airport is located on a piece of land of Chaoyang District on the northeast of Beijing, 25.35 km from Tiananmen Square. It is the busiest transportation and production major international airports of China, on the most important location, with the largest and most complete equipment. Beijing Capital International Airport T3 Terminal Station Transportation Center (GTC) is located to the south of the T3 Terminal Building, with total construction area of more than 34,000 square meters. 1,2-floors underground are open-large parking garage, the first floor has multi-hub facilities supporting the airport, and the second floor is suburban railway stations. The roof is a glass dome, and used long-span structures. The main functional area is a large space, and the external structure for large area is glass walls. The form is determined by functional requirements of the terminal station and visual and psychological demands of people. More precisely, the form not only is a concrete manifestation of humanized design, but also brings the problem of high energy consumption.

Abstract: A new solution to geometrically nonlinear problems is presented. It has been found that the deflection curve equation expressed in terms of geometrical parameters for a compressed bar is a result of superposition by an Euler’s curve for two-force member in buckling equilibrium and a deformation equation for two-force member in stable equilibrium. Corresponding with the superposition of deflection curves, the load case of the compressed bar is divided into an axial force with a moment and an axial force with a shear force applied to the two-force member respectively. The analytic principle and the deflection curve equation for compressed bars can be applicable to geometrical nonlinear analysis or buckling problems, which is called analytical methods. The decision rule for the equilibrium property of the deflection curve expressions is presented. Practical applications of analytical methods show that some brief formulas can be obtained in the load case without shear forces.

Abstract: The coefficient of variation of the raw silk size objectively expresses the fluctuating characteristics of the raw silk size, and is an important quality index in the development of the new standard used in the electronic testing for raw silk. This paper theoretically deduces the sampling distribution of the coefficient of variation of the normal population, justifies the theoretical results by computer simulation using Monte Carlo method, and thus afford important theoretical basis for the development of the new standards for the electronic testing of the raw silk size.

Abstract: Static method and energy method are two mainly solution methods for structure calculation presently. Static method often appears insoluble complicated transcendental equations and continues hardly. Energy method can solve force analysis of complicated structure and it is a widely used method at present, but in general it is not exact. In this article, analytic iterative method is a calculation method of analyzing geometrical nonlinear of frame Structures, considering the influence of geometrical nonlinear in structure calculation, on foundation of the analytic method that expressed with deflection equation of pressure column with geometry parameter expression with the combination of traditional linear analysis method. And a calculating application program is written to calculate displacement and force of frame structure in the environment of MATLAB language in order to apply conveniently. Because this method is on basis of analytic method, its results have sufficient accuracy. At last, there is an example to explain.

Abstract: SO₄^2-/ZrO₂ solid super-strong acid catalyst was prepared by supersonic immersion method and the catalysts were characterized respectively by IR, BET, XRD, Element Analysis and SEM methods. The results showed that the catalyst prepared by supersonic immersion method had the larger specific surface area, the smaller grain size, the looser crystal structure, the higher surface roughness and the more border location and edge locations, which were helpful to increase the number of catalyst activity centers and was used for the esterification of polyethylene glycol oleic acid produced by oleic acid and polyethylene glycol. It also had the higher catalytic activity and longer service life.

Abstract: Electrical effect induced by the laser plasma was investigated with an external tiny probe during Nd:YAG high-power pulse laser ablation on copper target in air. One equivalent circuit for the electrical effect induced by laser plasma was proposed. Based on the equivalent circuit, a new theoretical explanation of the signal generation mechanism is proposed, and the reason that the distribution of electrical signal wave is strongly dependent on the probe distance was discussed. Further the observed signal peak polarity overturn was explained.

Abstract: In this paper, hydraulic model experiment is performed for comparing the agitation ability of the coherent blowing and the top-bottom blowing. And numerical simulation is implemented for studying the influence of the concomitant flow temperature and pressure on the core space of the main jet. And the results show that the agitation ability of the coherent blowing and the top-bottom blowing is considerable. And the core space of the main jet of lance increases along with the increasing of the concomitant flow temperature under a certain pressure.

Abstract: A vertical tandem positioned twin roll caster and an unequal diameter twin roll caster were used in this study. Factors which affected the connecting of the strips in the fabrication using a roll caster were investigated. They were influences of oxide film, roll-load (separating force) and temperature of a strip. In the clad-strip casting by the roll caster, the connecting could be operated before the oxide film became firmly. Mn was useful element to prevent the oxidation. The roll-load could break the oxide film existed on the strip surface. Prevention of the occurrence of the oxide film was important to make strip connecting condition firm. In the casting of the clad strip using an unequal diameter twin roll caster, strips did not contact to the atomosphere before connecting.