Applied Mechanics and Materials Vols. 336-338

Abstract: This article describes the application of an e-learning system on the trainings of new employees in a LCD(Light Emitting Diode) enterprise. An international LCD chips manufacturing company regularly recruit and train new employees. Among the training content, the manufacturing process of epitaxy wafers to chips is abstract and difficult to understand, particular for those without engineering backgrounds. To make the training activities effective, the authors designed e-learning courseware with simulations of manufacturing processes. These web-based learning materials can be accessed before or after the training session. An experiment was conducted to evaluate the effectiveness of this e-learning system. The results revealed that this e-learning system significantly improved the learners content comprehension.

Abstract: With the background of large-scale wind power integration grid, in order to reduce wind farm voltage fluctuation and the grid loss, through the scenario analysis method, the objective function model was established to determine the best SVCs compensation capacity and compensation point. Firstly, the initial operation states of the wind power systems were obtained by the Monte Carlo sampling and power flow was calculated to get the reactive power compensation point and its capacity. Then the result of optimization model was calculated by the improved genetic algorithm. IEEE 30 system was taken as an example for the simulation calculation and the calculation results verify the validity of the model.

Abstract: This paper investigates a grid multi-wing hyperchaotic system firstly, then an improved module-based circuits are designed for generating the hyperchaotic attractor. Numerical simulation and circuit implementation have testified the feasibility of the proposed method.

Abstract: According to the coal slime pipeline blockage problem of coal gangue thermal power plant, after the analysis of the actual scene, it is sure that thick slurry pump master cylinder pressure prediction is the necessary premise of blockage prediction. The thick slurry pump master cylinder pressure prediction model is proposed, which is based on QGA-BP (Quantum genetic Algorithm BP neural network). The simulation results show that the prediction model based on QGA-BP can be used to predict the paste pump outlet pressure, and the relative error is less than 8%, which can satisfy the engineering requirement .And compared with prediction model based on GA-BP(the genetic Algorithm BP neural network), The QGA-BP prediction model is better than GA-BP model in prediction accuracy and optimization time.

Abstract: In order to drive beam-pumping unit with brushless DC motor (BLDCM), a kind of motor speed regulator was investigated. When pumping unit is in up stroke, BLDCM is power-driven; when in down stoke, pumping unit is braked by BLDCM. To meet the operation mode, PI double closed loops control strategy and Pulse Width Modulation (PWM) are applied. Simulation and test in field show that our design has good control effect and popularizing value.

Abstract: In order to solve the problem of road feel feedback of vehicle steer-by-wire (SBW) system based on joystick, a road feel control strategy was established to analyze the road feel theory of traditional steer system, which included return, assist and damp control module. By verifying the computer simulation results with the control strategy from software of CarSim and Matlab/Simulink, it shows that the proposed strategy can effective get road feel in different vehicle speed conditions and could improve the vehicle maneuverability to achieve desired steering feel by different drivers.

Abstract: This paper presents a new method to enhance the participation of doubly fed induction generators (DFIG) effectively in system frequency regulation. A new associated control based on Hopfield neural network (HNN) is proposed to control the rotor kinetic energy and the primary reserve power of DFIG simultaneously. The proposed approach takes advantage of the learning ability of neural network to form an adaptable Hopfield neural network controller (HNNC). And the feasibility of all those control strategies is analyzed in a Two-area four-generator system based on PSCAD/EMTDC. Simulation results indicate that the proposed strategy can greatly improve system frequency stability compared with classical strategies.

Abstract: This paper presents a novel method to improve the starting performance for sensorless brushless DC motor (BLDCM) with low cost, based on the principle of back electromotive force (BEMF). The commutation points are extracted from three phase terminal voltages achieved by AD converters integrated in the microprocessor. The phase delay caused by the detection circuit is compensated. The start process consists of alignment, accelerating, and switching. In the accelerating process, the commutation instants are determined by the zero-crossing points and phase delay table. The motor can be started reliably because of the closed-loop startup strategy. Experimental results have verified the effectiveness of the proposed method.

Abstract: The Problems that Simulation Robotic Fish Turn too Hard or Less due to Improper Angular Velocity Gear Values May Appear in the Process of Turning. in Order to Solve the Problems, this Paper Proposes a Method of Turning Gear Control for Robotic Fish Based on Intelligent PID Algorithm. in the Paper, the Control Rules and the Principle of Intelligent PID Algorithm are Discussed. Concrete Control Process with Simulation Analysis on Urwpgsimd is also Given. Experimental Results Show that it is Feasible that the Algorithm is Applied to the Turning Gear Control of Simulation Robotic Fish , and the Application of the Algorithm Effectively Avoids the Phenomenon of Turning too Hard or Less and Ensures the Accuracy of Turning Angle.

Abstract: A short explanation of the finite element method as a powerful tool for mathematical modeling is provided, and an application using constitutive modeling of the behavior of ligaments is introduced. Few possible explanations of the role of water in ligament function are extracted from two dimensional finite element models of a classical ligament. The modeling is extended to a three dimensional finite element model for the human anterior cruciate ligament. Simulation of ligament force in pitching motion of basketball player is studied in this paper.