Advanced Materials Research Vol. 717

Abstract: This paper presents the effect of an integral feedback controller for minimizing the pointing error at the tip of a very flexible and slender cantilever beam to follow a command signal. A piezoeletric PZT actuator patch isbonded on near the clamped end of the cantilever beam. Also it is considered that a position sensor is located near the tip of the beam but it is not attached on the beam. The beam is designed to be lightly damped and its step response withoutcontrol is quite long. But because of the non-collocation of the sensor and actuator, the plant response is non-minimum phase. After an intensive computer simulation, it is noted that the integral controller can reduce the settling time with proper stability and control gains. Also an analysis and comparison of the integral controller with a proportional-integral controller for the pointing error minimization of the very flexible and slender beam is described in detail.

Abstract: This paper proposes a novel additive increase and multiplicative decrease (AIMD) algorithm for wireless video transmission over cellular networks. The goal of this new algorithm is to improve the bandwidth utilization efficiency without degrading its fairness potential. To address this issue, it increases the regulating segment during the fast-recovery stage, and uses a time-window-based adjusting scheme to filter the short-time-slot bandwidth fluctuation. Simulation results show that the proposed algorithm has faster bandwidth recover speed and less transmission rate fluctuation than that of the traditional AIMD algorithm.

Abstract: This paper presents the synthesis method of an effective fault tolerant control system for actuators of manipulators which are described by nonlinear differential equations with variable parameters. This system ensures due to specifically formed additional control signal insensitivity to faults arising in actuators . This allows ensuring the operation efficiency of manipulators in aggressive and extremal environment. The results of simulation confirmed the efficiency of the proposed method.

Abstract: Generally, the electro-hydraulic system (EHS) has force and position controls. The control of these parameters to the desired value multiple PID controllers are often used, which are sensitive to changes in system parameters. In addition, the existing EHS is often used as a single proportional direction control valve (PDCV) to control those parameters that cause loss and waste energy. Therefore, in this paper, a fuzzy controller is proposed to control force and position. Simultaneously, the EHS that is used for control will be added the inverter to adjust the speed of the electric motor (EM) to drive a fixed displacement gear pump, and a proportional pressure relief valve (PPRV), in order to save energy. A proposed fuzzy controller and the EHS are implemented to the hydraulic press. The experimental results showed that the hybrid of force and position control by using a fuzzy controller has a superior performance compared to the multiple PID controllers. Moreover, the proposed EHS is also more effective in saving power consumption than conventional EHS.

Abstract: BP network model has become one of the important neural network model, is used in many fields, but it has some defects. As from a mathematical perspective, it is a nonlinear optimization problem, which inevitably has the local minima problem; BP neural network learning algorithm has slow convergence rate, and the convergence speed and the initial weights of choice; network structure, namely the hidden layer nodes selection is still no theory until, but according to the experience. Based on the BP algorithm the local extreme values, considering the genetic algorithm and BP algorithm is combined with, on the BP neural network optimization. Neural network using genetic algorithm optimization mainly includes three aspects: the connection weights of evolution, evolutionary network structure, learning the rules of evolution.

Abstract: Smart Home is an emerging interdisciplinary subject, which has already enjoyed flourish development all over the world and has become the mainstream of the development of the construction industry in the 21st century. In this paper, through the design of smart home which mainly uses embedded microcontroller design, this vast world of smart home is introduced to everyone, so that they can pay more attention to smart home. Design the embedded system which takes ARM as the core through the model of host - subsystem, through RS485 bus management and control of the control terminal, and process, automatic control and regulation is conducted. The three subsystems of home security, appliance control, family MRs are also used to design home by use of embedded system. The design of smart home control system can make family life more comfortable and convenient, more economic and security, and take a firm step in order to meet the demands of people of safety, comfort, convenience as well as confirm to the green environmental protection.

Abstract: This paper describes the method of semiautomatic position telecontrol by a multi-link manipulator using a setting device (SD). In this setup the kinematic schemes of the manipulator and the SD are different. The television camera in zone of work can change its spatial orientation. It can rotate around two mutually perpendicular axes by operator commands. The algorithm of work of computing system which forms setting signals for drives of manipulator is also represented in the paper. The results of executed experiments and mathematical simulation of the system work confirm effectiveness of this method.

Abstract: The circuit has combination of high speed and low switching losses. The need for detecting the current zero crossing is eliminated by applying a specific switch activation schedule for each combination of the current and Voltage signs of the main taps. The new method reduces the electrical stress in the Switches and the electromagnetic emission [ref.

Abstract: With the continuous development of football games, more and more football matches are hold in the world. From the World Cup to the big league, the erroneous decisions of the goals by referee always became the focus of the games. Federation International de Football Association (FIFA) is discussing now to introduce high technology to the football games to assist the judgment of the referee. In this paper, an advanced detection technology for soccer goal is proposed. This goal detection technology is based on the optical principle, high speed camera, as long as infrared detection devices. By detecting the change of electronic signal in the moment of goal, which can cut off the laser beam, the goal can be detected. In addition, the detection results and in-situ video are transmitted in real time to the arbitrators, which can reduce the goal disputes and make the game of football more fair.

Abstract: Weld automation is the development trend of underwater welding, and underwater weld seam tracking is one of the key technologies in weld automation. This paper used active visual sensor to automatically monitor the weld seam in underwater wet weld process, and image processing algorithms were developed to automatically obtain the weld torch deviation, then the weld torch was adjusted automatically according to the deviation obtained by the image, experiment results showed that this method could be used in underwater wet welding.