Advanced Materials Research Vols. 433-440

Abstract: Designed the control system policy for automobile electric seat using fuzzy control technology, therefore established its control model by Fuzzy Logic Toolbox, and carried on the off-line simulation to choose controller's optimum control parameters. From the dynamic viewpoint, the auto electric seat adjustment system is not only a complex nonlinear function which includes the location of the DC servo motor and the speed, but also contains serious nonlinear coupling interference, so the system is a highly nonlinear strong coupling, variable multivariable system. Application of traditional control methods (such as traditional PID) is difficult to meet its order requirements, so the research is highly robust method of intelligent control is an effective way to solve the problem. Fuzzy control technology has become the field in which drawn greater attention and researched in recent years. It doesn’t depend on the mathematical model of controlled object, has a good robustness, and nonlinear control characteristics, so it is an effective means to control the object with time-varying, non- linear parameters. In this paper, fuzzy control technology to achieve the orders of auto electric seat adjustment control system functions in the Literature [1], and the tracking of the system was simulated.

Abstract: In order to ensure the machining precision of wedge nonaxisymmetric aspheric lens, a parallel grinding method is designed using a clamp with adjustable gradient. Based on the machining method, three path plans of machining are put forward. Simulation results show that the three methods have their particular advantages according to the different requirement of machining.

Abstract: It is known that for automotive semi-active suspension the damping of shock absorber shall be continuously adjustable. One approach for damping adjustment is via adjusting flow area of throttle valve of shock absorber using stepping motor. Throttle valve can be realized using electro-magnetic valve or any other type of driving valve. In order to be applied on semi-active suspension, the throttle valve is required to have high control precision, fast response speed, strong anti-pollution capability and etc.. In this paper a new type of digital valve is presented to control the flow area of shock absorber. The configuration is developed by the utilization of the two-motions-degree of freedom of a single spool. To solve the contradiction between the response speed and the quantitative accuracy which characterizes the previous valve of the same sort, a specially designed tracking program is adopted to the stepping motor control to smooth displacement output. Experimental results show that both static and dynamic performances of the digital valve can fulfill the requirement of semi-active suspension, which is valuable in the application of system such as semi-active suspension where the liquid flow needs to be controlled rapidly and accurately.

Abstract: In recent sea and undersea vehicles, implementation of all-electric ships (e-ships) technologies that employ various types of semiconductor switching devices based power conversion modules has brought revolution. These power converters that are nonlinear loads can produce non-sinusoidal distorted currents and these currents are then delivered and broadcasted through the power network and thus bus voltages are distorted. This effect can be more obvious while large loads fed and controlled through power conversion modules, such as electric propulsion system, operate for different purposes of missions. In order to improve the harmonic distortion due to operation of electric propulsion systems, a novel control model for electric propulsion motors is proposed in this paper. The electric motor drivers are controlled through three inverter triggering signals including pulse width modulation (PWM), Quasi-Six Step, and Six-Step for different ship navigation scenarios. Simulation results of application of the proposed model to a practical ship with electric propulsion system are presented. Test results have demonstrated that with the proposed model the harmonic distortions produced by electric propulsion systems under different speed situations can be effectively mitigated and consequently the system supply quality is maintained.

Abstract: New trends of environmental and economical issues have motivated ship end users to pay more attention in producing affordable power solutions for future vessels. This movement has been recognized by the commercial shipbuilding industry and the U.S. Navy and the aspects of integrated Power System (IPS) are introduced into the planning and design of all-electric vessels to improve system utilization and operation. The IPS consists of an architecture and a set of generators which together supply power to ship service loads as well as electric propulsion systems. However, for reliable and efficient operations, an effective system performance study framework is important and essential. To ensure the operating performance of IPS in all-electric vessels under different navigating situations, a dynamic simulation technique based method is employed in this paper for analyzing voltage variations. The dynamic characteristics of IPS are modeled and simulated by the proposed method. To demonstrate the effectiveness of proposed method, a practical vessel IPS with 6110 kVA of generation capacity and two 2200 kW propulsion motors is selected for computer simulation. Test results have shown that with thorough simulations, the system performance with respect to transient and dynamic voltage qualities can be completely represented by the proposed method, which can assist engineers in determining proper system design or mitigation options.

Abstract: In a deregulating environment, Independent Component Analysis (ICA) is used to estimate the harmonic currents of non linear loads as it does not require information about the topology of the network. However, analysis is done by ignoring the effect of various noises that creep into the measurement system. In the present work, the effect of environmental noise on a simple interconnected power system with five buses is taken up. The two algorithms namely Fast ICA (FICA) and Efficient Variant Fast ICA(EFICA) are used for the analysis. A fixed noise is added and it is eliminated using whitening technique The simulation results of both algorithms show that noise elimination by whitening technique is highly successful. However, EFICA gives better results than FICA when random fluctuations of load exist rather than when fixed variations exist.

Abstract: Direct torque control (DTC) of three-phase permanent magnet brushless AC (PM BLAC) motor having one phase open-circuit fault (OPOF) is presented. Torque and flux linkages of the faulty motor are estimated by proposed estimators. Control topology, voltage vectors and design procedure are described. Simulated results show that the proposed topology can be operated under fault situation at rated torque and speed operation. Performances of the system are validated by the measured data.

Abstract: The focus of the present paper is on modeling the distribution grid using Petri Net for reconfiguration. Such system can be described as node and connection. So modeling this system is to model the node and connection in order to describe all the actions in the system then collect the data . Each connection in the power network will be transfer to Petri Net according to the designing of the fiche. Then the whole system can be modeled by Process Algebra Petri Net (PPN). It makes the grid more compact and easier to monitor

Abstract: Pollution problem has become a major social problem, and its existence affects the quality of our life and limits a higher level of economic development. How to better control pollutions has become a more serious practical problem before us. In this paper, firstly, it analyzes the advantages and disadvantages of main pollution control measures in the aspects of sewage charges, tradable discharge permit system, subsidies and mandatory technique and so on, and then describes the basic policy of environmental protection, pointing out that the performance of the environmental management policies and systems shows more and more in adaptation and gap, in which not only the environmental economic policies and systems are not perfect, with a low environmental efficiency, but also the entire environmental management system does not meet the needs of the current situation. Finally, it aims at the current status of pollution control in China, through a multi-perspective analysis of improvement measures in the hope of helping the pollution control in China.

Abstract: The hardware and programming of lane boundary identification system, which based on the hardware platform of DM642, designed. The system complete the functions of acquiring image data, optimizing acquired data by ant algorithm, comparing value by the objective function, exporting image of lane boundary and so on. For the sake of improving the real time capability further, optimize code by way of methods, which include the optimization of compiler, intrinsic function, packaging data, using pipeline technique, and assembly code, giving specific optimization methods and real time capability of algorithm affected by each process. As a result the identification time of system reduced from 101.75 ms to 20.55ms, improved the system of real time capability effectively, laying a good foundation for industry.