Advanced Materials Research Vols. 490-495

Abstract: In this paper, a new analytical analysis method for chaos: exclusion method is used to analyze ferro-resonance in power system. Its basic idea is that for any systems, there are only four different solution types, that is, constant solutions (equilibrium solutions), periodic solutions, almost periodic solutions and chaotic solutions. If the parameter spaces corresponding to the solutions except chaotic solutions are excluded, the remaining parameter spaces are only the scopes corresponding to chaotic solutions, and then the analytical conditions for the chaotic solutions are obtained. This new method has been applied to the chaos analysis of vibrations equation and electronic circuit successfully. The analytical conditions for chaotic ferro-resonance solutions are obtained for the first time in a recently published paper and the conclusions are proved correct theoretically. In this paper, the resulted conditions are simulated numerically and compared with the Melnikov method to identify the efficiency of the exclusion analysis method. Compared with classical Melnikov method, the conclusion of this article shows that the new method is much more accurate than previous analytical method and is suitable for the system with any degree, especially for high dimensions system.

Abstract: In this paper, we present a variant of Newton method with order of convergence eight for solving nonlinear equations. The method is free from second derivatives. It requires three evaluations of the functions and two evaluations of derivatives in each step. Therefore the efficiency index of the presented method is 1.5157 which is better than that of classical Newton’s method 1.4142. Some numerical experiments illustrate that the proposed method is more efficient and performs better than classical Newton's method.

Abstract: The interaction between a screw dislocation and a reinforced lip-shaped crack embedded in an infinite matrix subjected to a remote longitudinal shear load is investigated in this paper. By combining the sectionally holomorphic function theory, Cauchy singular integral, singularity analysis of complex functions and Riemann boundary problem, the problem is reduced to solve an elementary complex potentials equation. The general expressions of complex function in the matrix and the reinforcement layer are derived explicitly in series form for the case when the screw dislocation is located in the matrix. The image force acting on the screw dislocation and the stress intensity factor are also calculated. Some numerical results are provided to discuss the effects of dislocation position, material parameters, geometric configurations and eigenstrain on the image force.

Abstract: Based on the dynamic analysis and numerical computation of quantum cascade laser(QCL), a simple equivalent circuit model of QCL was established, in which we considered the spontaneous emission effect for QCL's start delay. The direct current(DC), transient and frequency response characteristics of QCL were obtained by means of the circuit simulation of PSPICE program, and some relevant parameters that may affect the QCL performance have been analyzed. The results of simulation are consistent with that of numerical calculation in previous literatures.

Abstract: Ant colony optimization has been become a very useful method for combination optimization problems. Based on close connections between combination optimization and continuous optimization, nowadays some scholars have studied to apply ant colony optimization to continuous optimization problems, and proposed some continuous ant colony optimizations. To improve the performance of those continuous ant colony optimizations, here the principles of evolutionary algorithm and artificial immune algorithm have been combined with the typical continuous Ant Colony Optimization, and the adaptive Cauchi mutation and thickness selection are used to operate the ant individual, so a new Immunized Ant Colony Optimization is proposed.

Abstract: In this paper the method of Linear Quadratic Regulator (LQR) is employed for controlling accelerator PWM power supply, and improving its dynamic functioning. A method based on the Particle Swarm Optimization is proposed to optimize the weighting matrix Q and R. In order to control the dynamic behavior of the power supply, the fitness function of PSO is acquired considering the needs of the power properties. The results of simulation proved that the proposed method was much better than simple LQR method and LQR-GA method, and the performance of the power supply was improved dramatically.

Abstract: This paper proposes a system, which can rapidly count votes in traditional elections based on image understanding. Firstly, the system gets ballot images through high-speed scanner and preprocesses the images. Then, it recognizes the geometric structure and layout of ballot image through detecting table lines. In addition, it also recognizes the logical structure of ballot image through analyzing the relative positions of candidates and vote symbols. Thirdly, it locates candidates and symbols on the ballot table, and recognizes the specific symbols based on run features. The system has been implemented, which shows high counting speed, high recognition accuracy with wide applicability.

Abstract: Atmosphere laser communication, as a very good wireless communication method, has been studied by so many people theoretically and experimentally since the invention of laser. In the atmosphere laser communication system the effect of different weather conditions to the transmission was different, there was no theoretical formula of the effect of rainfall to laser communication and only the empirical formula could be achieved by plenty of observations. Since the parameters of empirical formula from different literatures were different, in this article rainfall attenuation was simulated according to the empirical formula under different parameters and the results differed. It was proved that the conditions to the empirical formula could not be incarnated in the formula itself, large numbers of tests were needed to make sure that the parameters were confirmed. In this article rain attenuation under normal weather conditions was presented with some familiar parameters.

Abstract: This paper focuses on the model and analysis of wet dual clutch transmission (DCT) during vehicle launch. Two evaluation indexes, slipping friction work and degree of jerk, is presented, and a single clutch control strategy is established and has been validated after applied for an experimental vehicle equipped with a wet dual clutch transmission.

Abstract: A design and implementation of a detection system for dangerous driving was proposed based on multi-sensor-fusion. It is actually an embedded system consisting of visual,sensor, acceleration sensor, alcohol sensor input, and ARM cortex-M3 microcontroller. Experiment results show that the system has high linearity, high sensitivity,and excellent real-time performance. It can be further used to validate the multi-sensor information fusion algorithms in the field for improving the low reliability of the current detection by using one single-sensor method