Advanced Materials Research Vols. 785-786

Abstract: The Petlyuk distillation configuration has received considerable attention because of its efficiency to reduce the energy required for the separation of ternary mixtures. The dynamic properties of fully thermal coupling distillation column, which separates ternary mixtures of H₂O, ethylene glycol (EG), diethylene glycol (DEG), are analyzed. The possible control configurations were investigated using Relative Gain Array (RGA) Analysis and dynamic simulation. The results indicate that the provided control scheme is able to produce a stable control response for thermally coupled distillation systems and shows better dynamic responses than the conventional distillation sequence.

Abstract: Computational Fluid Dynamics (CFD) technique was employed to investigate the flow regime and pattern in liquid-liquid ejectors. The results show that the turbulent dissipation rate decreases initially and then increases with the increase of the secondary flow mass rate at a fixed working flow rate, and increases as the working flow mass rate increases at a fixed secondary flow rate. The shape of the flow distribution is convex when the ratio of suction flow velocity to jet flow velocity (velocity ratio) is 0.25,while the shape is concave at the ratio of 4. In addition, the deflection of the flow field inside ejectors is affected by the variation of secondary flow feed angle. There exists an angle of about 24°, at which the flow pattern would be relatively reasonable.

Abstract: CFST Arch Bridge under pressure mainly stability is one of the key factors restricting its development. Most of the arch of instability belongs to the second type of instability, and that the non-linear deformation of the structure is nonlinear state, the mechanical properties of the structure also change from elastic state into nonlinear state. In this paper, based on nonlinear and stability theory and using the finite element software ANSYS, parameters of affecting the main arch stability were studied. By analyzing the geometric and material nonlinear factors on the structural stability, the parameters of influence on the stability of the main arch were discussed, including width-span ratio, arch-rib inside inclination, rise-span ratio and arch-axis coefficient. The influence law of these parameters were summarized and will be used to guide the actual project.

Abstract: This paper takes ball cage patterned constant speed universal joint of as the research object. Using the 3 d modeling software solidworks to establish solid model and simplified it . Based on ANSYS, do finite element contact stress analysis by the universal joint of the two kinds of condition. find out the weak part,through the improvement of raceway design parameters, Relieve the stress concentration phenomenon, reduces the maximum stress, increases the service life of universal joint.

Abstract: Reinforced concrete structures have been increasingly widely used through numerous industrial fields. These structures are often exposed to severely corrosive environments such as sea water, contaminated water, acid rain, and the seashore. Thus, corrosion problems of the steel bars embedded in concrete are very important from a safety and economic point of view. In this study, the effects of cover thickness on the corrosion properties of reinforced steel bar embedded in mortar specimen (W/C:0.6) were investigated using electrochemical methods such as corrosion potentials, polarization curves, cyclic voltammograms, galvanostat and potentiostat. Corrosion potentials shifted to the noble direction, and the value of AC impedance also exhibited a higher value with increasing cover thickness, furthermore, polarization resistance also increased with increasing cover thickness. This is probably that the thinner cover thickness, seawater solution is easy to arrive at embedded steel compared to other thicker cover thickness, so, its steel bar may be easily corroded due to chloride ion, which is resulted in shifting corrosion potential to negative direction, decreasing polarization resistance. Consequently, it is considered that the relation between corrosion resistance of reinforced steel and cover thickness is nearly matched with each other. However, its corrosion resistance estimated by measurement of corrosion potential was not well in agreement with value obtained by polarization curves.

Abstract: To get complicated curved surface parts in wire cut electronic discharge machining, a rotary CNC processing table was designed. Through establishing the mathematical equations of the general motion form, the several major processed forms are obtained. Then the processing system and its experimental device were established. Through machining experiment and error analysis, it shows that the system has high machining quality and low cost and has practical applicability, to produce a novel research direction for solving the difficult problems of machining spatial curved surface parts.

Abstract: This chapter describes how lift can be derived from a known aircraft geometry and conversely, how the selection of aircraft layout influences the generation of lift. As the fuselage shape is predetermined by the payload requirements, the nacelle geometry by the engine size, and the tail surfaces by stability considerations, the wing parameters are the principal variables to be considered in respect to lift aspects. To this end, guidance is given on the selection of wing section profile and platform geometry to provide specified performance requirements. A lift estimation method covering all the aircraft components is also provided. Such methods are suitable for use in the conceptual design phase and provide an introduction to more detailed estimation procedures.

Abstract: This chapter describes how the overall configuration of the aircraft is decided from the many options available to the designers. From a brief historical perspective the chapter then looks at the unconventional layouts that have been considered in the recent past. Although these have not yet found favor with designers it is worth keeping them in mind as conditions and constraints may change in the future. Such changes could make current layouts less attractive or even not feasible. New designers should start a new project with a completely open mind and this means a careful consideration of all configurations particularly in a historical context.

Abstract: Based on actual working conditions and parameters of the rudder system, the purpose is optimizing the connection of rudder system by keyless coupling technology. Analysis on the keyless coupling of rudder system is done by the finite element method under impact loads in different directions. It can improve the performance of keyless coupling in the specific operation conditions of rudder system to be excellent. According to the test requirements of the torque and impact, the results of the completion of the finite element analysis are verified by establishing the experimental platform of keyless coupling. Experiments and analysis of the results show that the preload is formed by the hydraulic nut in the keyless coupling and the static frictions is formed between the rudder and tiller. In the meantime, it is formed between rudder and the rudder blade which can make the working state of the rudder system stable under the required torque and impact loads.

Abstract: Spruce Budworm is the most destructive defoliator of coniferous forests in Western North America .This paper discusses a randomized Spruce Budworm model with HollingIII Functional Response. Using results from lyapunov function, we show that the positive solution of the associated stochastic differential equation does not explode to infinity in a finite time under simple assumption .It is shown to improve existing results.