Applied Mechanics and Materials Vols. 66-68

Abstract: In this paper, we introduce a secondary evacuation planning problem which is solved by computing flow-dependent shortest path through a known shortest time escape route on a ship. Given a primary escape route, our secondary evacuation planning problem consists in finding the second-shortest escape route, based on the cabin network rebuilding. We suggest a new model for flow-dependent network where the travel time of each link depends on the flow speed and the flow speed depends on the total number of evacuees traversing the link. The model focused on the average evacuation time to travel through the ordered sequence of consecutive arcs by each group, and we proposed a heuristic algorithm to produce sub-optimal secondary evacuation plan. A numerical example is given at last. Results showing that our algorithm can effective supply the flow-dependent network k-shortest path need in reasonable computation times.

Abstract: This paper presents a thorough study of the wave-plate gas-liquid separators. The resistance curve has been obtained by the method of combining numerical simulation and experimental research. The separation efficiency curve under rated conditions for the droplet with different particle diameters has been obtained by using stochastic trajectory model. This can provide a new method for the research of wave-plate gas-liquid separator. The results obtained here may provide some new theoretical guidance for the development and optimal design of wave-plate gas-liquid separator.

Abstract: Exhaust noise is the major noise source of the internal combustion engines, and the exhaust silencer is the device to reduce the exhaust noise. Exhaust gas of the internal combustion engine is high-temperature, therefore in the study of internal combustion engine exhaust silencer, the surface temperature’s influence on the surrounding adjacent facilities should be controlled to a certain range and the status of the temperature field depends on the material and structure of the adiabatic envelope. The model of exhaust silencers discussed in this article is fluid-solid interaction model and this paper uses the CFD software for numerical simulation of the model. Using appropriate boundary conditions, calculation models and silencer model with heat transfer surface, this paper uses N-S equation and standard turbulent model to simulate the flow field and wall temperature field inside the silencer, and does post-processing analysis of the results.

Abstract: Different zones of the marine environment were simulated by a designed marine corrosion test device in laboratory, through which the corrosion rate was tested by weight loss method applying separate specimens and electrically connected specimens, separately, and the test data were compared with those by seawater exposure method. The results showed that the corrosion in splash zone was the most severe whether for separate specimens or electrically connected specimens, and for the latter, the experimental data were more reasonable to simulate a continuous marine structure throughout the different zones in marine environment. The feasibility and reliability of the simulation device and the experiment method were also verified.

Abstract: Large eddy simulation has been applied to simulate the compressible flow past one and two wall-mounted rectangle cylinders, respectively. The dynamic subgrid stress model is employed to approximate the subgrid scale effects. Flow past one single wall-mounted cylinder is used as an example to validate our code. Flow past two wall-mounted cylinders is chosen for investigating the variation of flow fields and drag coefficients under different heights of two cylinders. Our numerical results show that, with certain ratio of two cylinder height, their drag coefficient can be improved, which is important for practical building industries.

Abstract: English vocabulary processing is the English language comprehension link, refers to the word's meaning gain. The research is mainly lexical processing around English lexical access and vocabulary ambiguity resolution launch. In the English vocabulary Tonga study, form, sound effect has been the researchers’ point of contention. In the English vocabulary ambiguity resolution research, sentence the function of context and sentence contexts and ambiguity word different meaning interaction is to understand English vocabulary, is also the key ambiguity resolution English ambiguity resolution model the essence of debate. Long-term since, the researchers using behavioral research methods of these problems, and puts forward the research of English vocabulary to various theoretical model processing. However the traditional study methods often exist in the supreme task interference, unable to accurately existing in the process of linguistic understanding of automatic processing and cognitive real-time processing processes.

Abstract: This study in the main object for Jiangxi blue sky institute teachers, cover English, machinery, electronics, computer four major. The basic connotation of the teaching and research integration is "teach without inquiry is shallow, inquiry and not teach is empty, teaching and scientific research, teaching research of initialization, both supplement each other, promote each other, improve together. Teaching and scientific research integration, it should make the teaching and scientific research and fusion, inseparable. Teaching and scientific research integration is not easy implementation, to really make every teacher's every day work have the research content, must ensure that teachers can with correct education theory as the guide, in view of the actual problem, in teaching and research in the process of finding appropriate medium develop education scientific research and will eventually scientific research achievements into solving teaching problem, improve teaching quality of valuable use of resources. The teaching and the scientific research integration is aimed at school this overall instead of the individual teacher, teacher team is to realize the overall objectives and teachers' personal goal of the organic combination of Bridges. Therefore, in order to promote the teaching aim of integrating scientific research, actively develop the college teachers’ team construction, to further improve the teaching quality in universities, and realize the healthy and sustainable development plays a very important and realistic significance. Therefore, this investigation focus on respectively from the Angle of teachers and students to analyze the teaching and the scientific research integration aspects, in order to get on teaching and scientific research integration teachers team construction effective approach.

Abstract: The Rayleigh dispersion curves of multilayered soil are calculated by means of thin-layer method and rapid scalar method, respectively, in which two-layered and three-layered soil model are adopted. In addition, the disperse properties of multilayered soil are analyzed, and it is found that thin layer method is superior to rapid scalar method in low frequency domain, while in the high frequency domain it has little difference between each other.

Abstract: The influences of heating temperature and holding time on the microstructures were investigated during the semi-solid remelting process of rare earth Al-4.5Cu alloy. The evolution mechanism of crystal organization was discussed. Experiments show that the heating temperature and holding time are very important to the grain size and uniformity. It is the most suitable parameters, as heating temperature is 630°C and holding time is 20 minutes, to remelting process. During the remelting process, grain mergering and Ostwald growing up is the main mechanism of change on microstructures.

Abstract: The semi-solid microstructure of ZL101 alloy was fabricated by technology of vibrating inclined cast. The effections of length of slope and vibration voltage on microstructure were also investigated. The experimental results showed that two parameters played an important role on the microstructure of ZL101 alloy. The homogeneous, small and rounded sphere-like semi-solid equiaxed crystals were obtained when the ZL101 alloy was cast in water-cooled copper mold with 25cm slope length at 640 °C and 60v vibration voltage, the average grain diameter and shape factor of which was 26.5um and 0.8, respectively.