Applied Mechanics and Materials Vols. 313-314

Abstract: A PID temperature control system was designed with the LabVIEW graphical programming language and the PID toolkit. Data collection, PID control, data record and data check were experimented to the practicable instrument with the purchased programming power supply and data collection record system. Operate the hardware and software of the computer with the virtual instrument and realize the smooth control of the system temperature with the accuracy of 1.

Abstract: This paper introduces a DSP-based intelligent control of DC motor system, describes the intelligent control strategy of the DC motor, optical isolators driving ,related protection measures and the hardware and software design. The experimental results show that the control system can reduce the transient process such as over-voltage, inrush current of the switching operation etc. Comparing with the existing analog control circuit, its structure is simple, easy to operate and can improve electrical energy quality.

Abstract: Based on the inverse Nyquist plot, this paper proposes a method to determine stabilizing gain regions of PID controller for time delay systems. According to the frequency characteristic of the inverse Nyquist plot, it is confirmed that the frequency range is used for stability analysis, and the abscissas of two kind key points are obtained in this range. PID gain is divided into several regions by abscissas of key points. Using an inference and two theorems presented in the paper, the stabilizing PID gain regions are determined by the number of intersections of the inverse Nyquist plot and the vertical line in the frequency range. This method is simple and convenient. It can solve the problem of getting the stabilizing gain regions of PID controller for time delay system.

Abstract: T coordinate formation control for multiple underactuated AUVs. An optimal performance index is proposed to give attention to both tracking quality and formation constraint. A reference feasible trajectory for the position and orientation based on velocity control is planned so that it is consistent with vehicle dynamics. And the performance index is transformed to the error one. The optimal controller is designed to solve the problem. Using the controller we demonstrate the physical realization of control system at the same time. Simulation results validate that the proposed formation methodology are presented and discussed.

Abstract: Based on MATLAB self-tuning fuzzy PID controller design, the line parameter of the PID controller to adjust, to further improve the performance of the PID controller to adapt to changes in the control object parameters changes and working conditions.Introduction

Abstract: In this paper, the improved genetic algorithm is applied to optimize the quantization factors and the scaling factors of fuzzy control, and the optimized rule table and membership functions is obtained according to certain performances. Then a kind of optimal fuzzy PID-Smith control method based on genetic algorithm is proposed and its simulation model is built in this paper, a second-order system is simulated and analyzed. The results show that requirements of deterministic performances of the new control method are better than the conventional methods through the simulation results in the stability, rapidity and robustness.

Abstract: This paper exploits a multi-objective control technique for T-S fuzzy system with hard constraints, which include actuator saturation and state constraints resulting from some mechanical structure constraints. The disturbance attenuation performance is characterized H norm, while requirements for respecting hard constraints are specified by the generalized H₂ norm. The T-S fuzzy system control problem is then formulated in a mixed H /generalized H₂ control problem , and an state feedback solution is derived using LMI optimization.

Abstract: For the characteristics of direct drive NC rotary table servo system using ring permanent magnet torque motor being influenced by varying of external disturbance, parameters varieties and load disturbances, the desired compensation adaptive robust position controller based on projection algorithm is designed to achieve high performance and parameters estimation. The desired compensation adaptation law based on projection algorithm for uncertainties off-line estimation is calculated by desired information only to achieve high requirement of the servo system of the ring permanent magnet torque motor. Compared with adaptive robust controller, the controller can reduce the effect of measurement noises. Therefore the process of uncertainties estimation is faster and the estimators are more accurate. Simulation result shows that the designed method enables the system to be better in robustness in general.

Abstract: The series fuzzy control system is designed for boiler steam temperature based on the characteristics of boiler steam temperature control. The composition, the principles and the algorithm were presented in this paper. The corresponding fuzzy logic control system is simulated and analyzed with MATLAB.

Abstract: Wind/PV hybrid generation technology is one of the hottest researching spots in the application areas of new or clean sources of energy. Designing a new small portable wind/ PV hybrid controller can effectively make use of wind power and solar energy to those whose are in the outdoor to work or tour . In this paper, 89C51 microcontroller as the intelligent control core was used to manage and control the wind/ PV hybrid system and accomplish the battery charging through a timer producing a high-frequency PWM. Meanwhile it used the Multisim software to simulate the 60W wind/PV hybrid system. The experimental data proved that the parameters of the hardware system were correct and the whole power system was secure and reliable.