Papers by Keyword: Control

Abstract: In recent years, China's air pollution control achieved great results, but for various reasons,the situation faced by the atmospheric environment in China is still very grim. Total emissions of air pollutants are high. It can be said that air pollution is still serious, it is still the major environmental problems we solved.

Abstract: It analyses the major pollution sources from airport oil depot and the harm they will cause, then it discusses the countermeasures to prevent and control these pollutions from four aspects, i.e. the oil depot construction, the daily management, pollution prevention and controlling methods and perfecting related laws and regulations.

Abstract: This paper investigates the problems of stability analysis and stabilization for a class of switched fuzzy discrete-time systems. Based on a common Lyapunov functional, a switching control method has been developed for the stability analysis of switched discrete-time fuzzy systems. A new stabilization approach based on a switching parallel distributed compensation scheme is given for the closed-loop switched fuzzy systems. Finally, the illustrative example is provided to demonstrate the effectiveness of the techniques proposed in this paper.

Abstract: The study determines the most suitable pattern of alignment and fixing of low-rigidity shafts; it also presents factors that determine such choice. The part is fixed both by force closing and kinematic closing. A new method for machining low rigidity shafts is developed to control the elastic-deformable state of these shafts in a technological system and to produce parts with the required accuracy during turning. To implement this new developed method for low rigidity shafts, an apparatus is designed. The apparatus allows to increase the rigidity of shafts during machining by the application of axial tensile force to the workpiece. Rational prime costs of preparing technological alignment centers at the stage of production preparation are determined; knowing these costs, it is possible to select a suitable machining technology for low rigidity shafts, to produce a technology-oriented design, and to reduce the costs of machining these shafts.

Abstract: At present, the switch with manual control is generally used in the brake cooling spray system of heavy truck, but the switching time is difficult to be determined by drivers. PLC is suitable to be the controller for the braking spray system of heavy truck, because of its advantages such as high stability, strong anti-interference ability and easy maintenance etc.. In this paper, it’s introduced that the composition, the working principle and function of the braking spray system based on PLC.

Abstract: Machine is adopted to replace human eyes to complete measurement and judgments. Target image is identified by computer and insert into automatic aiming control process to complete the shooting direction computing and automatic position aiming process.

Abstract: Nowadays, the level of mechanization is gradually increasing. In order to promote the rapid development of the mechanized production in China, the automatic control of large-scale machinery is required. Therefore, this paper puts forward a control model for the large-scale mechanical arm angle. During the control, the angle of the large-scale mechanical arm was calculated based on the actual production so as to achieve the automatic control of the angle. The experimental results indicated that carrying out automatic control of the large-scale mechanical arm according to algorithm proposed in this paper could improve the accuracy of the automatic control.

Abstract: To improve the vehicle comfort, Magnetorheological damper is installed on the vehicle suspension system. So the system with hysteretic nonlinearity is a typical nonlinear system. First, the behavior of system under the periodic excitation force is analyzed, and the possibility of chaos is proved in the paper. Then, with piecewise-quadric function employed, the nonlinear feedback controller can be used to control the chaos. At the same time, Melnikov’s method is used to gain coefficient of controller. Numerical simulation shows that this method can the effectively guide chaotic motions toward regular motions. This control method is quite simple and effective without affecting the system properties. The results may supply theoretical bases for analysis and optimal design of vehicle suspension systems.

Abstract: A system of feed-water treatment monitoring and controlling based on the integration of PLC and computer is described in this paper. Its composition, functions, and communication are illustrated emphatically. This kind of water treatment system shows many good performances, such as high precision, reliability, easiness in operation and so on. Its study and application is essential for thermal power plant safe and economic operation.

Abstract: Ladle operation for steel plant directly affects the production operation to the site, through artificial means of a track record of special steel ladle operation process analysis, on this basis, considering the "product structure" on the operation of the ladle on the rational calculation of the number of ladle has been improved. Match for different machine in case of furnace ladle operation, classification discussed the number of its ladle operation control strategy.