Computational Materials Science

Volumes 268-270

doi: 10.4028/www.scientific.net/AMR.268-270

Paper Title Page

Authors: Li Gao, Ke Lin Xu, Wei Zhu, Na Na Yang
Abstract: A mathematical model was constructed with two objectives. A two-stage hybrid algorithm was developed for solving this problem. At first, the man-hour optimization based on genetic algorithm and dynamic programming method, the model decomposes the flow shop into two layers: sub-layer and patrilineal layer. On the basis of the man-hour optimization,A simulated annealing genetic algorithm was proposed to optimize the sequence of operations. A new selection procedure was proposed and hybrid crossover operators and mutation operators were adopted. A benchmark problem solving result indicates that the proposed algorithm is effective.
476
Authors: Xue Jun Meng
Abstract: Along with Development of digital campus, much key application system run on base of digital campus, usability of application system, integrality and confidentiality of application data arouse much recognition of university gradually. The paper gives introduction and analyzing from some key indexes, technology frame etc. and offer reference about construct of Disaster Tolerance system.
482
Authors: Zheng Jeremy Li
Abstract: Plastic welding is a technical process of welding plastic component together and it is one of the primary processes of joining plastics. There are several types of techniques in the plastic welding including hot gas welding, extrusion welding, contact welding, hot plate welding, injection welding, and friction welding, To increase the plastic welding speed and sealing capacity, this research introduces a new automated and high speed cap sealing system applied to cartridge filled with gas product. The computer-aided modeling analysis and prototype testing show that this automated and high speed welding system has high production rate, good sealing quality, reliable function, and cost-effective manufacturing process.
489
Authors: Jai Houng Leu
Abstract: This study applied three-dimension numerical combustion simulation method to design the specifications of a low heating value (LHV) fuel combustor. According to the discussion on design parameter system, quantity of main jets is the governing factor for flame stabilization of the primary combustor zone. Combustor outlet temperature factor improves with increase of load, and can be reduced to 0.33 under full load. However, load increase may slightly change recirculation flow structure and weaken flame stabilization. The findings showed that the combustion strength of near-field area greatly increased, and the recirculation flow structure center moved to the liner well when combustor used propane as fuel. This also caused deterioration of temperature factor.
494
Authors: Jing Hong Liu, Xiao Cheng Huo
Abstract: In this paper, we consider the Poisson problem with homogeneous Dirichlet boundary conditions on the bounded open domain and analyze convergence phenomena that appear by using cubic serendipity block elements with thirty-two degrees of freedom. By means of the standard Legendre polynomial technique, we derive an error estimate, which is not superconvergent and shows this serendipity element has not pointwise supercloseness properties.
501
Authors: Zhi Yong Qu, Zheng Mao Ye
Abstract: Hydraulic servo systems are usually used in industry. This kind of system is nonlinear in nature and generally difficult to control. The ordinary linear constant gain controller can cause overshoot or even loss of system stability. Application of adaptive controller to a nonlinear hydraulic servo system is investigated in this paper. The dynamic model of the system is given and the stability is also analyzed using Popov's criterion. The steady state error can be eliminated using adaptive controller combined with an integration term. Simulation results show the performance of adaptive controller with fast response and less overshoot
505
Authors: Zhi Yong Qu, Zheng Mao Ye
Abstract: Permanent magnet synchronous motor systems are usually used in industry. This kind of systems is nonlinear in nature and generally difficult to control. The ordinary linear constant gain controller will cause overshoot or even loss of system stability. Application of adaptive controller to a permanent magnet synchronous motor system is investigated in this paper. The dynamic model of the system is given and the stability is also analyzed using Popov's criterion. The steady state error can be eliminated using adaptive controller combined with an integration term. Simulation results show the performance of adaptive controller with fast response and less overshoot.
509
Authors: Zhi Yong Qu, Zheng Mao Ye
Abstract: A speed estimation technique for the permanent magnet synchronous motor drive is presented in this paper A Model Reference Adaptive System (MRAS) has been formed using the voltage and current to estimate the speed. It has been shown that such unique MRAS offers several desirable features. The proposed technique is completely independent of stator resistance and is less parameter sensitive, as the estimation-algorithm is only dependent on q-axis stator inductance. Also, the method requires less computational effort as the simplified expressions are used in the MRAS. The stability of the proposed system is achieved through Popov’s Hyperstability criteria. Matlab simulation results are presented to validate the proposed technique.
513
Authors: Guo Rui Li, Ying Wang
Abstract: It is very important to minimize the amount of data transmission in wireless sensor networks so that the average sensor lifetime and the overall bandwidth utilization can be improved. In this paper, we propose a prediction based data aggregation scheme which takes advantage of temporal data correlation among sensors to monitor continuously changed environmental conditions. A seasonal time series model is built up to predict the sensed values of ordinary sensors according to the collected historical data. The experiment results show that our proposed scheme can provide considerable aggregation ratio while maintaining a low prediction error rate.
517
Authors: Hai Tao Song, Huan Yu Liu, Dong Yi Chen
Abstract: Head Mounted Display (HMD) has been widely used in the area of wearable computing, augmented/virtual reality etc. The different image sources and optical subsystems of HMDs result in the diverse comprehensive display properties and optical properties. The traditional method to evaluate a HMD is modular transfer function. It requires special instruments, software and professional backgrounds knowledge, and thus leads to the lack of usability when it applied by common users. On the basis of human transfer function and Fitts’ model, in this paper we proposed an evaluation method, which has the advantage of easy applying. We evaluated this method targeting at a commercial HMD and a custom HMD, and the result shows that our method has a high usability.
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