Applied Mechanics and Materials Vols. 336-338

Abstract: A new modeling method for flyback converters in DCM is proposed in this article. On the basis of the method of state-space averaging, using the new duty ratio constraint and the modification matrix M, the modified averaged model is derived here, then the nonlinear full-order model is established. Finally, the transient response and control-output transfer function of the proposed model are simulated in Saber, the results show that the new modified average model is accurate enough.

Abstract: In allusion to temperature hard to control for parameters parameter being variable and nonlinearity in the process of annealing furnace. A detailed study of the annealing furnace temperature control by combined with fuzzy and PID in this paper, all dynamic parameters of the annealing furnace temperature have been considered effectively, and by this control system method the temperature of annealing furnace was controled steadily. Through the simulation experiments show that this PID control mode has a characteristics of good dynamic performancestrong adaptability and good robustness in the application of the annealing furnace temperature control.

Abstract: In this study, a lab-on-chip (LOC) system is designed for the cell sensors to provide a high-efficient continuous analysis platform of acute toxicants in water environment. The chip is composed of three domains, including counter-flow micromixers, a T-junction droplet generator and time delay channels (TD-Cs). Water sample and bioluminescent bacterium Vibrio Fischeri (VF) are imported into the micromixers before that the droplet generator encapsulates them inside aqueous droplets separated by air. Air flow is the disperse medium, which can guarantee sufficient oxygen supply for the cells in droplets. The system shows high reliability and stability through numerical and experimental investigations.

Abstract: In this paper, a general method is proposed for the anti-synchronization of chaotic systems with unknown parameters. This approach is based on the Lyapunov control theory, and employs a combination of feedback control and adaptive control. With this method, the unknown parameters is estimated and the adaptive feedback controller is designed to not only guarantee stable anti-synchronization but also reduce the effect of external disturbance to an norm constraint. Numerical simulations results are presented to demonstrate the effectiveness of the method.

Abstract: EPS can improve many aspects including chassis coordinated control. Aimed at eliminating the adverse effects deriving from the controlled and uncontrollable differential braking condition, this paper analyzed the EPS-based compensation system control strategy. Coordinated control of EPS and differential braking ensures the vehicle driving safety and driving comfort purposes. Based on the above research, this paper verified the EPS compensation control strategy in simulation environment.

Abstract: The objective of this paper is to present the system construction and operational principle for a DC charger of electric vehicle. By means of analyzing AC and DC sides for the chargers, a reason was derived theoretically for producing specified harmonic current while absorbing fundamental wave of electric power system. The modeling and measuring procedures of multi-harmonic source for single and multiple chargers were proposed. The summation effect of harmonics for charge/exchange station which was regard as a public coupling circuit (PCC) of the electric power system. The simulation and measuring results indicate that as a new type of nonlinear load, the charger represented a characteristic of steady-state harmonic source.

Abstract: Aiming at the problem of maintenance and it is difficult to find the fault caused by optical parts fretting. By means of mathematical tools to express optical parts imaging laws. With the computer simulation technology, combining with optical fretting theory and practical problems, producting a set of simulation software and showing the influence of optical parts fretting. The results show that the fretting of optical elements influence the imaging effect and firing accuracy. For the maintenance training of universal and serialized sighting telescope, the simulation research provides technical means.

Abstract: Micro grid may exert adequately distributed generation efficiency, and that wind Photovoltaic and Energy Storage is a key equipment in the micro grid. Aiming at the distributed generation existing intermittence and randomicity characteristic, the paper discussed the micro grid P/Q control method under the connection grid state and the micro grid U/F control method under the disconnection grid state. It also studied the distributed generation parameters variational law under the micro grid different run mode, and built the correlative mathematics model and tested by simulation. The results show: the control strategy ensured the mice grid running stably, and achieved the system anticipative design request, and offered theory foundation for the distributed generation extend application.

Abstract: Active control in the application has more and more research, the independent modal space control method is transform the system equation into modal coordinates, then obtain the internal decoupling equations express by modal coordinates, and based on control algorithm calculate the modal control force, which achieve real-time control effect. The control calculation method is simple and efficient to meet the needs of active control. The paper introduce modal control theory and implement methods, design and manufacture the piezoelectric driving lever based on the working principle of the piezoelectric pile, then through the test, give the voltage-driving force relationship, which is linear. An active control experiment on a three-layer intelligence space structure had been done, it can be seen that through the active control, the corresponding modal displacement and acceleration of the structures control are a lot of inhibition; at the same time, through spectral analysis, it can be seen the structured modal damping coefficient corresponding to varying degrees have been improved.

Abstract: Based on the finite element methods of ANSYS software, field-circuit coupling methods are generally used in modeling and analsysing switch converter circuit of Simple step-up Boost circuit. Compare the Simulation results with ANSYS and MATLAB/simulink circumstances, Field-circuit coupling model is correct, through real calculation was tested and verified. Combination with authors preceding paper, there are indications that ANSYS software applies to electromagnetic field analyse electronic device and circuit. Above research works make a foundation for further studying electromagnetic field analyse problem working personnel and scientific research personnel are of application worthiness.