Applied Mechanics and Materials Vols. 548-549

Abstract: This paper presents the effect of power supply of LED lamp for external lighting are compares with electrical performance, electrical energy saving, illuminance, and the effect of harmonics noise from each power supplies on external lighting with LED. By designing and construct a linear power supply by the full wave rectifier circuit by bridge diode type and switching power supply by buck converter. The result that, the full wave rectifier circuit by bridge diode type was consumed higher power less than buck converter but lower effect of harmonics noise. In additional, as a result will be important data to the education develops and the next research.

Abstract: As a new soft computing method, rough set theory can deal with imprecise, inconsistent, incomplete problems, which is due to the maturity mathematical basis. Considering the environmental factors, the forecast model of grid-connected PV system based on rough sets theory was established, which has been tested and verified on the 5.6kW grid-connected PV system in Beijing Institute of Architectural Engineering. Compared the forecasting result with acture operation results of the week, month, season and year generation, it shows that former is more correct and accuracy. So the research proved that the forecasting model of rough set is practical.

Abstract: A novel low voltage ride through (LVRT) control strategy is designed by using sliding mode control (SMC), based on the analysis of dynamic mathematical models of the doubly fed induction generators. This method chooses two sliding surfaces according to the requirement of LVRT. It designs control strategies by combining function Lyapunov and exponential reaching law. The results of common vector control and this strategy are compared by simulation experiment of grid voltage depth dropping, which shows that the novel control strategy is better than traditional vector control strategy and is beneficial for the system quick recovery after faults£®

Abstract: An innovative approach to energy harvesting is to integrate the capture of fragmented energy with micro-electromechanical system (MEMS) to achieve the power self-sufficiency needed for the circuit to function as an autonomous system. This study used a micro-motor as a micro-generator for capturing not only fragmented energy, but also instantaneous energy. The experimental results confirm that energy can be captured from uncollected daily rotational mechanical energy with sufficiently high efficiency and low cost to replace the conventional battery power used in wireless sensors. Applications of this technology in green buildings can not only reduce the energy wasted by wiring, but can also improve internal aesthetics.

Abstract: Building Integrated with Photovotaic (BIPV) will become an effective way of building energy efficiency. A capacity determination method of energy storage system based on spectral analysis for BIPV was presented. To take both the isolated operation and grid-connected operation into account, the energy storage capacity can be determined based on spectrum analysis results of the control power to smooth power fluctuations in microgrid. Results indicate that the power control target of tie-line in microgrid can be achieved and the power fluctuations of BIPV output power and load power can be effectively smoothed by a relatively small capacity of energy storage system determined by the presented method.

Abstract: Water removal from polymer electrolyte membrane fuel cell (PEMFC) during gas purging after shutdown is investigated by using a three dimensional two-phase transient model. The effect of initial cell temperature on the drying process of PEMFC is studied. It is found that the initial cell temperature has significant effect on the drying process during gas purging and high initial cell temperature is benificial for water removal.

Abstract: This paper presents the position and attitude control of an unmanned aerial vehicle known as a quadrotor. A design methodology is introduced that a fuzzy logic controller in an intelligent way. It offers several advantages over certain types of conventional control methods, specifically in dealing with highly nonlinear systems and modeling uncertainties. The proposed controller was located at a position feedback loop which composed of x,y and z. Plus, it also designed at the angle acceleration loop. Simulation results prove the efficiency of this intelligent control strategy.

Abstract: This paper presents a method of solving the problem of mobile robot Obstacle avoidance and path planning in an unknown dynamic environment. A linear model of the two-wheeled nonholonomic robot controlled using Model predictive control controller. For obstacle avoidance Fuzzy logic control is used. The ultrasonic sensors are used for positioning and identifying an obstacle. The proposed method is successfully tested in simulations. Obstacle avoiding technique is very useful in real life, this technique can also use as a vision belt of blind people by changing the IR sensor by a kinetic sensor ,which is on type of microwave sensor whose sensing range is very high and the output of this sensor vary in according to the object position changes.

Abstract: This paper describes an existing force feedback system for an omni-directional telepresence robot developed by Chungbuk National University and its implementation with force feedback. The method proposed in this paper features force feedback on a joystick in order to reduce the risk caused by the delay between communications and to help a remote user safely adjust the robot when an unexpected situation occurred or obstacle is detected. This method complements the method being used in existing telepresence systems based on remote control, only depends on a camera and ultrasonic sensors to reduce the delay between communications. Additionally, it takes into account the moving speed of the robot. It is shown through experiments that the proposed method can detect obstacles effectively and print out the force feedback suited to a situation using force feedback based on fuzzy control.

Abstract: More global decision making delegation should be given today man made systems with large number of heterogeneous components and high complexity. A new paradigm is proposed for mix of power and information fluxes at task control level for goal accomplishment, with associated trajectory manifold resulting from system self-organization. It rests upon system invariants characterizing Complex Systems (CS) dynamics, and uses qualitative methods independent of system state dimension privileging robustness to compensate impreciseness of system parameters and functional variations. A well defined control law is constructed in explicit terms from mathematical representation of system dynamics, guaranteeing both asymptotic stability and robustness. A “determinism” criterion for autonomous system is considered with evaluation of resulting constraints on system parameters. Proposed merging of Complex Systems with Information Technologies (IT) provides a first step toward system autonomous intelligence.