Applied Mechanics and Materials Vols. 241-244

Abstract: To resolve the problem of lumping lag and nonlinear of the coupled-tank liquid-level control system , a fuzzy Smith- PID control approach is researched. In this approach, the characteristic of the control system is analyzed，the fuzzy Smith- PID controller is designed. In kingview, the monitoring interface is designed, and the Liquid-level control system is practiced.The result shows that this method is rationality and feasibility.

Abstract: Based on the intermittent control and the nonlinear measure about l 2-norm, a novel and effective approach to synchronization of multi-chaotic systems with ring and chain connections is investigated. The proposed approach offers a design procedure for multi-chaos synchronization of a large class of chaotic systems. Numerical simulations of multi-chaotic Lorenz systems are given to illustrate the main results by choosing appropriate coupling coefficients by using the intermittent controllers.

Abstract: In order to solve problem in lithium battery charging system about uncertainty and difficulty of setting of the parameters, a new method of compound controller of fuzzy + variable universe fuzzy-PID based on ant colony algorithm optimization is proposed. When the system fluctuates frequently, the fuzzy control enables the system to have the most superior dynamic performance; when the system enters the stable phase, variable universe adaptive fuzzy-PID control improves the accuracy of the system. Ant colony algorithm is applied to optimizing the values of PID parameter offline. The offline optimized values are used as the primary values for online adjusting and they can make the system more stable. The proposed compound control strategy is applied to the lithium battery charging system. The simulation result shows that the system has features of anti-disturbance and robustness.

Abstract: As knowledge discovery in databases, data mining means a process of extraction potentially useful information from data in databases, which can be applied to information management, query processing, decision making, process control etc. Those are urgently needed to improve efficient management in water supply industry, since water has been recognized by governments worldwide as a scarce resource. In response to such demand, this paper proposes a software application, which designed to accessing to database, operating the data mining, and output the results and charts. We analyzed the different prediction models and designed the water consumption system, which has two functions of analysis of possible correlations between the water consumption and nature of the industry and prediction on future water consumption. As the system built, the paper provides samples and produces the results and analysis.

Abstract: Wind turbine system with Permanent Magnet Synchronous Generator (PMSG) is a complex nonlinear system of multi-interference and strong coupling, so its accurate mathematical model is difficult to be built. Due to the randomness of the wind, traditional PID control is often hard to get satisfactory results in the Maximum Power Point Tracking (MPPT) control of the wind turbine. A new adaptive optimization control based on action dependent heuristic dynamic programming (ADHDP) is presented to control the stator current of PMSG. The stator current of the generator can adapt the change of the wind speed, so the MPPT of PMSG can be achieved. Simulation results in Matlab/Simulink show that the ADHDP controller can get better performances than PID controller.

Abstract: The model of circulating fluidized bed (CFB) electric power generation process based on dynamic method which needs a lot of parameters, but these parameters are usually not easy to get. A model method based on least square support vector machine (LS-SVM) which directly uses the experimental data is presented to overcome the weakness of mechanism model, and the system structure and algorithm are given. Compared with the experimental data, the simulation results show that this method has good performance and can provide control and optimization reference to the CFB electric power generation.

Abstract: Automatic control system of circulating fluidized bed boiler (CFBB) is considered that has long combustion lag characteristic, instable parameters and difficult to formulate a mathematical model. A T-S fuzzy controller according to the study of fuzzy control based on proportional factors is put forward. The value of each proportional factor is verified by experiment and an online adjusting rules are made. The controller can distinguish the forecast output of least square support vector machine (LS-SVM) and adjusts the proportional factors by the rules. To verify the control effect, the model is simulated with matlab. The results reveal that the control effect is superior to normal control system.

Abstract: According to the control requirements of campus ringers, a PLC-based automatic control system is realized by using the real time clock function provided by S7-200 CPU224 PLC and the friendly human-computer interaction function provided by TD400 text display. The control system can automatically judge the ringing work mode by the current system time of PLC, that is the summer time ringing mode and the winter time ringing mode. The user can also choose other work modes, such as the college English test mode and the computer grade test mode by pushing the button of the text display. In this paper the composition of the control system, the working principle and the designs of hardware and software are introduced. The system has advantages of friendly interface, simple operation, convenient maintenance, high reliability, strong anti interference ability, which makes it popularize.

Abstract: When UAV is implementing the simultaneous location and mapping (SLAM) problem, the environment where UAV is flying exist unavoidable solid or moving obstacles, which threaten the flying safety and the completeness of SLAM mission. To conquer this problem, an improved artificial potential field algorithm is proposed to simultaneously accomplish obstacle avoidance of UAV and SLAM mission based on a cost function containing the distance from UAV to the goal and from UAV to the obstacles. Concerning the built UAV plane motion model, this algorithm is simulated and tested. The result shows that the proposed algorithm is effective to avoid the obstacles for UAV SLAM.

Abstract: A simulation process and resulting for circulating fluidized bed combustion system was presented. The controlled plant was a 3I3O sub-system, and a direct generalized predictive control was used as controlling algorithm. Satisfying dynamic and steady-state performances are got.