Advanced Materials Research Vol. 705

Abstract: The essay first establishes the general design for intelligent rotary speed system of the brushless DC motors, then based on the general design scheme, two-dimensional fuzzy controller, adaptive current adjustor and mainly used hardware circuits are designed. The mainly used hardware circuit design includes the circuit design of current detecting circuit, voltage detecting circuit, high-speed optocoupler, motor driver circuit, zero-crossing comparator circuit, etc. At last the designed controller and hardware circuits are tested to achieve optimum effects for rotary speed control through validation of experimental devices.

Abstract: The traditional analysis of the leaf spring just implemented a simplified mechanical model without considering the friction between the leaf springs. In order to do better in designing the leaf spring with variable cross sections, this paper firstly constructed the parameterized model of the taper leaf spring, and then applied the contact theory to add contact element to simulate the friction between the leaf springs in the FE analysis. After these steps, the assembly of the prestressed, the stiffness, the damping ratio and the fatigue life of the leaf spring could be achieved. It shows that the analysis and computation of taper leaf spring based on FE contact analysis can reflect the actual situation more comprehensively after comparing the results with those calculated with traditional way and those recommended by industry .

Abstract: This paper introduces a modified differential evoluiton method to solve the tension/compression string design problem. The modification is derived from mechanisms of social networks. In the proposed method, each individual will be attracted by the knowed best individual following the connectivity between each other. The connectivity is calculated based on the difference of the variables in each vector. The individuals with high connectivity tend to perform local search while those with poor connectivity tend to perform global search instead. The approach was employed for a tension/compression string design problem and by comparisons with the other evolutionary algorithms, the proposed method privided better resutls.

Abstract: The characteristics of the transient heating control process of aerodynamic simulation experiments are complicated, transient, highly nonlinear, and strongly coupled, which make it difficult or impossible to develop a mathematical model. By using the fuzzy control method, many good qualities (such as robustness, high adaptability to changing parameters, and a short transition process time) can be obtained. Based on the fuzzy control method, a transient aerodynamic heating simulation control system for missiles was established. It was demonstrated that quick dynamic control of the aerodynamic simulation heating process according to the transient and continual change in heat flow on the surface of high-speed aircrafts can be completed by using this control system.

Abstract: Based on virtual simulation results, the structural health monitoring (SHM) system for the wing structure was established, which could detect the structural damages. With the FE model of the wing structure in the aerodynamic loads conditions, the response parameters of the wing can be calculated to reveal the damages characteristics. There are obvious differences between damaged wing and normal wing which can be utilized to detect the damages and locate the damaged positions.

Abstract: The impact phenomenon may be used for task-oriented changing of rigid body motion. When moving body encounters with some obstacle all parameters of motion are changing as a result of impact and trajectory and type of motion are also changing. In this work the conversion of translatory motion of prismatic rigid body into plane or rotation and conversion of plane motion of cylindrical body due to impact are considered. The conditions of conversion of one type of motion into another and parameters post-impact motion are studied. Problems are solved in the framework of rigid body motion, using rigid body impact theory. Studying of such phenomena is important for location of parts on industrial conveyors, feeders, etc.

Abstract: Among the problems of the rotor machines dynamics the special attention is given to the problems of creation of the automatic balancing devices (ABD) in form of a hollow rotor, filled by a liquid, and the liquid-solidbody ABD. The theoretical and experimental works on research of the ABD on the base of a hollow rotor filled partially with a liquid and of the liquid-solidbody ABD are not enough. Therefore development of the methods of research of dynamics of the rotor machines with the ABD and such machines designs is an actual, new and perspective problem. In the present work the mathematical model of the rotor system with the ABD taking into account of the engine characteristics is offered. Lets consider the model of the rotor with electric drive with one disk, set up at the flexible shaft without skew. The shaft is lean on two bearings (fig. 1).

Abstract: Noise gates are common equipments in audio processing which can attenuate all kinds of the noise effectively and have some applications in making special effects. This paper introduced the six parameters in noise gates also: attack time, release time, ratio, range, hold time and threshold.

Abstract: This article topics based on multi-feature fusion the Mean shift target tracking technology belongs to the field of intelligent video analysis, moving target tracking is interested in moving target location each image in a video sequence to find and acquire the target movement. Moving target tracking problem can be stated as interested in moving target movement prediction in the video sequence, feature extraction, feature matching and template update problem. In this paper, we consider using compressed domain features as a complement of the color features to extract the compressed domain features first need to understand the compressed domain detection technology. Detection based on the compressed domain, that is, in the case of not decoding or a small amount of decoding, directly on the compression characteristics of the image analysis, in order to achieve the detection of the image moving object.

Abstract: As the fastest growing operating system, Linux is applied in broader areas, and more and more people start to use Linux operating system. In allusion to the hot issues like Linux and UnixLinux and free softwares, Linux kernelLinux DistroLinux and embedded systemLinux and WindowsLinux teaching, the research results have been summarized in the article.