Advanced Materials Research Vols. 756-759

Abstract: as the foundation and critical part of the free Space optical communication, the electro-optical tracking system is a typical nonlinear system. However, the angular accuracy should be better than a few micro-radians to meet the requirement of the communication link construction between two terminals. To get more control precision, the mathematic model of the coarse pointing system is founded, and sliding mode variable structure controller with approach law is designed. Finally, the simulation is done separately for a typical PID controller and the variable structure controller. Simulation results are showed that the sliding mode control can finely control the attitude of coarse pointing system, and can get higher precision by contrasted to the conventional PID controller.

Abstract: Comparison with conventional manual adjustment to control the drop speed in clinical infusion, the infusion monitoring system can achieve much more high reliability and efficiency, and is easy to realize the automation of infusion. So the infusion monitoring system has been designed in the last papers. To test the designed system performance, some experiments are done. And the result show that under requirement of the system precision, the time consumption increase with the incensement of speed difference value; Comparing to the conventional PID controller, the fuzzy-PID controller can achieve high precision and little stabilizing time consumption.

Abstract: This paper introduces an ARM-based embedded PWM DC motor control system. The system uses a variable voltage control; the entire system uses the speed and current closed-loop control structure. The main circuit using the structure of high-power system GTR switching devices and the bipolar H-bridge circuit for the power amplifier circuit, to complete irreversible speed regulation also finished reversible speed regulation. PWM modulation part of the ARM embedded development platform, using the C language programming to control the timer to generate two complementary width adjustable rectangular waves. GTR H circuit is controlled by adjusting the width of the waveform from two ways off time in order to achieve the purpose of speed regulation. It increased the flexibility and accuracy of the system while simplifying the process of generation of the PWM pulse.

Abstract: In view of the pressure control system of the large gas collector in coke oven, this paper puts forward a optimization control scheme of coke oven collector pressure intelligent decoupling control system. Using a variety of advanced control strategies based on the DCS , it develops a large coke oven collector pressure control system.The engineering application shows that the system design is versatile and effectiveness.

Abstract: Observer design for nonlinear systems has been an important and complex issue for decades. In this paper, considering a class of nonlinear systems which satisfy Lipschitz condition, a method for observer design is investigated based on Linear Matrix Inequality (LMI). This study focuses on the selection of gain matrices using LMI for two kinds of Lipschitz nonlinear systems, which are classified by the relationship between output and state. Simulation studies are made with Matlab/Simulink in this paper, and the simulation results verify the effectiveness of the proposed method.

Abstract: The diesel engA control system of diesel engine speed regulation based on the structure of fuzzy neural network is proposed in this paper, which is combined with PID controller in order to regulate PID parameters dynamically. The simulation result proves that the system has good control capability and robust stability, as well as good self-study and self-adaptive ability.

Abstract: Doubly-fed VSCF wind power generator has become the main machine because it can improve the efficiency of wind power and obtain the optimal energy output at rated wind speed. In the control of excitation on double fed generator,the technique of direct torque control become the mostly method.This paper adopts voltage space vectors subdivision technology of direct torque control technology that can improve the low frequency characteristic,and structure the experiment system based on DSP. The result indicated the project is feasiblIntroduction Wind power as a kind of green energy has attracted more and more attention. in recent years, wind power technology has made rapid development. Double-fed generator becoming the main type of wind power generator because of its capture wind energy efficiency at rated wind speed. At present, foreign countries have successfully applied direct torque control ( DTC ) technique in VSCF doubly-fed wind power generator, Whereas DTC exist the problems of low frequency excitation current aberrance and output torque ripple. Therefore, this paper puts forward the space vectors subdivision method to improve the low-frequency characteristicbased on the traditional direct torque control of doubly-fed generator, And structure the doubly-fed generator direct torque control experimental platform about the digital signal processor ( DSP ), realize the grid-connected power generation.

Abstract: This paper introduce a power regulator controlled technology using bridge type inverter, and apply it to the design of electromagnetic heating furnace. The main circuit, principle, control scheme and how to design of the heating furnace are described. The heating furnace proved to be low cost, low weight, low volume, high efficience of output. The routes and technical details, this paper dealed with, has the reference value in the relevant industry design.

Abstract: Video surveillance, convenience and rich information, has been widely used in security, protection, monitoring and other occasions, and has already been one of the most important precautionary measures in commercial, residential and transportation areas. However, considering the massive data transmission needs and higher real-time requirements for video surveillance, a remote video surveillance plan has been put forward on the analysis basis of Microsoft DirectShow and Image Compression. This plan adopts the C/S structure, adapts to the requirements of real-time video transmission, with a better fluency. In addition, the picture clarity satisfies the application requirements.

Abstract: The shroud removal system is an important part of the cryogenic target project. Based on research status of the cryogenic target shroud removal system, this paper presents a solution of AC servo control system using programmable multi-axis controller. The superior performance of the controller and the latest technology of AC servo control system provide a strong support for the solution. We complete the hardware system design and the development of PC software control system. On this basis, we carry out the shroud removal experiment. The experimental results show that the solution can basically reach the technical specifications of the cryogenic target shroud removal system.