Advanced Materials Research Vols. 383-390

Abstract: A PSO Algorithm with Team Spirit Inertia weight (TSWPSO) is presented based on the study of the effect of inertia weight on Standard Particle Swarm Optimization (SPSO). Due to the theory of group in organization psychology, swarm is divided into multiple sub-swarms and search is run in a number of different sub-swarms which are parallel performed. Try to find or modify a curve which is compatible with optimized object within many inertia weight decline curves, in order to balance the global and local explorations ability in particle swarm optimization and to avoid the premature convergence problem effectively. The testes by five classical functions show that, TSWPSO has a better performance in both the convergence rate and the precision.

Abstract: In order to meet the daily needs of the elderly patients and walking ability of injury rehabilitation, design an intelligent rehabilitation crutch. This design combine with empowered walking aid’s mechanical features and robot technology, its signal is collected by MMA7260 accelerometer, this greatly improved the sensitivity direction without swerve on the plane through the analysis of the acceleration signal processing and controlling the velocity composition of three omnidirectional wheel rounds of synthesis of all to realize the intelligent walking stick of the whole direction and intellectuality of the walking aids. The motion mechanism of crutch using omnidirectional wheel structure and using ATmega 16 microcontroller to establish low-level control system. The crutch can move in any n of free movement. The kinematics analysis shows the design feasibility. In the manual and automatic control experiments, it can meet designer quarrymen’s and achieve design function.

Abstract: As a result of inverted pendulum control based on traditional neural network algorithm existing shortcomings that are training time to be long, the convergence rate slow and easy to fall into the partial minimum point, a method of fusing genetic algorithm and neural network control is proposed in this article. The structure of inverted pendulum controller adopts neural network, genetic algorithm is used to optimize the attached weights and thresholds of neural network. The experimental results illustrate that the method can overcome inadequacies of the neural network, with the characteristics of convergence speed is fast, global search ability is strong, dynamic and steady state control performance is good. Furthermore, it has advantages of simple controller structure and easy to be implemented.

Abstract: The power system operates safely and stably depends on the reliable operation of electric automation system of which the master control computer is the core. To improve the reliability,security and real-time performance of the master control computer, the error-tolerant model of master control computer based on replication technology for electronic automation system is built and the implementing method of model is introduced in great detail. For the defects of dual-computer hot backup system and on the basis of three-machine voting system, the error-tolerant model of master control computer designed in this paper makes some improvements in system structure and voting algorithm ,so as to provide a reference for the construction of electronic automation system in the “strong” and "self-healing" smart grid.

Abstract: The constant voltage power supply with dual directional reversible PWM compensation has merits of high precision, high efficiency, small volume, and so on. To ensure the quality of supply, it is important to fix the value of inductance, capacitance in main circuit. From the angle of filtering, and through analysis of the circuit working, detailed formulas of the inductance and capacitance calculation are given and an example of it is given too. In parameters calculation, to reduce the volume, the filter inductance is taken a smaller value but the capacitance is taken a greater value; the DC smoothing capacitance should be chosen according to the amplitude limit of DC voltage rising in inversion, and should be taken as great as possible to maintain voltage stabilizing precision.

Abstract: In order to analyze the complex phase transition in the gas-liquid-solid three-phase mixing systems and to predict gas-liquid-solid multiphase mixing time, a novel method combined image processing technology, computational homology and CFD (Computational Fluid Dynamics) numerical simulation is introduced in this study. Firstly, the volume of fluid (VOF) multiphase flow model in FLUENT software is used for the simulation of fluid characteristics. Secondly the patterns produced by phase transition in the stirred tank are binaryzed. Finally evolution profile of the zeroth dimensional Betti numbers and the first dimensional Betti numbers in time series are obtained separately. In fact,some aggregates still remain in the tank after the homogeneous mixing.Comparing with the fractal method to characterize the mixing time, the result shows that this method not only can predict the gas-liquid-solid mixing time by the zeroth dimenstional Betti numbers, but also can predict the amount of these aggregates in the stired tank by the first dimenstional Betti numbers, leading to a useful parameter to characterize the non-uniformity of gas-liquid-solid mixing.

Abstract: With the popularity of digital technology, textile CAD/CAM design system have been applied extendedly and progressed greatly. AT-DESIGN is one of the several software regarding clothes and printing design in domestic market. From the view of a designer, this paper analyzes problems, commands defaults and other shortcomings exiting in textile CAD/CAM system which is based on AT-DESIGN. Moreover, future development goal and suggestion are given.

Abstract: Herringbone wells can effectively increase the exposed area of oil layer, increase reservoir producing degree, and extend the steam swept volume, ultimately to enhance recovery. The result of steam stimulation depends on injection-production parameters. This paper studies the six injection-production parameters including steam quality, steam injection rate, steam injection pressure, soaking time, cyclic steam injection volume and the maximum lifting rate, and considers the interaction among steam quality, steam injection rate and steam injection pressure. Using visual analysis and variance analysis to analyze the test results, the optimal combination of injection-production parameters were obtained, and the various factors were sorted according to their impact on the cumulative oil steam ratio. Research shows that the impact of interaction is not significant. The results of orthogonal numerical test can provide a theoretical guidance for herringbone wells injection-production parameter analysis optimization of steam stimulation in the field, and also have some practical significance.

Abstract: This paper introduces tracking differentiator based on the classical PID control in order to arrange the transitional process according to the set point and control system parameters, solving the contradictions between speed and overshoot of the manipulated variable in the traditional PID control. At the same time, tracking differentiator provide an effective method of calculating differential with low noise amplification. Nonlinear PID controller adopts a nonlinear combination of error, error differential and error integral to calculate the controlled variable in a very effective way. Applying this kind of nonlinear PID controller to the permanent magnet linear synchronous motor control system , the experimental results show that PMLSM can follow the speed command quickly in no overshoot, and has strong robustness, good static and dynamic characteristics.

Abstract: In this paper, the quasi-sliding mode variable structure control problem for interval coefficients nonlinear discrete singular uncertain systems with time-delay is researched, and it can be decomposed to two lower dimension systems with ordinary coefficients. According to some results on robust stability of discrete singular systems with time-delay, the quasi-switching manifold with difference compensator are designed, then with the quasi-sliding mode variable structure control law, the system comes to stability. At last, the feasibility and effectiveness of the results are explained by a numerical example.