Applied Mechanics and Materials Vols. 155-156

Abstract: This paper introduces how the simulator's credibility, which mainly includes the fidelity and accuracy, influences the practical application effects. Based on analyzing the factors that influence the physical fidelity and the mathematical model accuracy, an approach is put forward to improve the simulation precision. Furthermore, the paper summarized the practical values of the simulator and its function on scientific research.

Abstract: Focusing on the disadvantages of recent researches for roll planning that seldom consider the warm-up part and solution efficiency is low, in this paper, a parallel planning model and an improved ant colony algorithm were proposed to solve the problem. Firstly, the model considering constraints of both warm-up part and staple one was designed; Secondly, the improved ant colony algorithm was proposed where the slab cluster was used to decrease the searching scope and the local optimization to improve the efficiency of pheromone accumulation. Finally, with production data from hot strip mill, we proof the method can get the best results by comparing with other two ant colony algorithms.

Abstract: To research the performance optimization of high speed car diesel engine，firstly according to the characteristic of car diesel engine with Variable Nozzle Turbocharger (VNT)， one-dimensional cycle model of the engine was established by using simulation software BOOST and validated by experimental data in this paper. The turbine blades’ opening corresponding to different speed was determined. Therefore the problem that the VNT surges at low engine speed and the inlet air flow is insufficient at high speed was solved. Based on the above model, this paper improved the efficiency of the engine by optimizing the compression ratio and the distribution phase of camshaft and then used the experimental data to check the simulation results. Meanwhile the fuel consumption and the possibility of the engine operation roughness decreased.

Abstract: One simple but effective discrimination method was presented in this paper to separate AD from normal controls. After detecting the thickness of cortex with highly significant difference, the mean and standard deviation of these vertices are computed to construct confidence intervals. We introduced one relax coefficients to control the width of intervals and by experiments the coefficients was optimized. Experiments results showed that using this simple method, the classification accuracy, sensitivity and specificity of Alzheimer’s disease versus normal controls could be as high as 85%, 88.89% and 93.84% respectively.

Abstract: In this paper, we study the global dynamics of an SIRS epidemic model with nonlinear inci- dence rate. By means of Dulac function and Poincare-Bendixson Theorem, we proved the global asy- mptotical stable results of the disease-free equilibrium. It is then obtained the model undergoes Hopf bifurcation and existence of one limit cycle. Some numerical simulations are given to illustrate the an- alytical results.

Abstract: Based on the absorption principle of desulfurization process by sodium-calcium dual-alkali scrubbing method, the paper researches the computational model of gas balance, seriflux balance, and the circulating amount of seriflux, defines the equivalent relation between the data input and output, and develops a mass balance calculation software by Visual Basic 6.0. The software can be used for designing and equipment-selecting by employing the outcome of the computation. It can also do optimization and analysis of operation parameter. From the economic point of view, it is convenient for designers to choose the optimization parameter.

Abstract: In this paper, the hydrodynamic equation about the flow through plants has established through the physical model experiment and theory deduction, the hydraulic characteristics of vegetation dam has simulated with the established equation. The two-phase flow field of the water sink with plant dam overlay has simulated with software of FLUENT, and the free surface has been tracked with VOF method, the plant dam overlay districts has been simplified with many bores area method, and the infiltration rate has been determined with the pressure difference of before or after bores area. The simulation velocity magnitude is compared well with the measured data.

Abstract: With the ever increasing resolution of scanned elevations, the efficiency of terrain rendering is still unsatisfactory in three-dimensional visualization. In order to improve the speed of terrain rendering, we had studied the root cause of the undesirable visualization efficiency in Visual Terrain Project, and found that one of the performance limitations was elevation color generation step. Therefore, we proposed a modified algorithm on the basis of data parallel mode, which can be well performed on GPU. Experimental results show that application performance is raised significantly by data parallel algorithm, and the improved algorithm can obtain satisfactory simulation results via CUDA.

Abstract: Stricter environmental regulations are making the use of an ample amount of conventional coolant impossible because of its negative impact on the environment. Consequently, the use of minimum quantity lubrication (MQL) has been regarded as an promising alternative to conventional fluid coolant applications. Despite several studies, there have been a few investigations about the influence of the MQL nozzle position, such as distance from tool-workpiece contact zone, elevation angles, the included angle between jet direction and feed direction. The current study presents experimental investigations on influences of the above parameters on performance in end milling. Tool wear and surface roughness are experimentally studied to compare the effects of different positions. The results show that the setting location of the nozzle is an important factor regarding the effective application of MQL oil mist.