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Fan L.-P.,Shenyang University of Chemical Technology | Liu Y.,Branch Company of Rolling Equipment | Xie Y.,Shenyang University | Guo R.,Shenyang Ligong University
Journal of Chemical Engineering of Japan | Year: 2013

Wastewater treatment processes are typically complex dynamic processes. They are also energy-intensive processes. Using a more accurate control method is an effective solution to reduce the running cost of an entire wastewater treatment system. In this paper, a fuzzy sliding control scheme is proposed to control the aeration process of a sequencing batch reactor wastewater treatment process. It controls the aeration process by regulating the oxygen transmission coefficient according to the dissolved-oxygen index. Simulation results show that the proposed control scheme can deliver effective control. © 2013 The Society of Chemical Engineers, Japan.


Lin Z.-K.,Dalian Maritime University | Qu Y.,Dalian University of Technology | Liu Y.,Branch Company of Rolling Equipment
ICIC Express Letters, Part B: Applications | Year: 2013

Recently, computers have become more commonly applied in large and mediumsized enterprises. However, there is existing work delay or a substantial increase in management fees and other conspicuous phenomena caused by fault management. It is particularly prominent for strengthening computer breakdown maintenance and management. This study describes computer breakdown maintenance and management decisionmaking problem by the queuing theory, also the computer breakdown maintenance management decision-making model established on queuing theory. It helps to seek a comprehensive low-cost and high-efficiency management optimization. Finally, with a practical example, the results show that the model has serviceable significance. © 2013 ISSN 2185-2766.


Fan L.,Shenyang University of Chemical Technology | Liu Y.,Branch Company of Rolling Equipment
Journal of Advanced Manufacturing Systems | Year: 2015

The main drive system used for four-high mill is usually a double closed-loop DC motor speed regulating system. Generally, the speed controller and current controller are proportional-integral-derivative (PID) controllers. The parameters of these controllers are usually determined by the engineering design method and are constant in the whole process. So the controllers can give good control effect in the rated operating condition. Once disturbance occurs, the control effects are often just passable. In this paper, fuzzy logic is used to adjust the parameters of the speed PID controller to improve the disturbance rejection ability. Simulation results show that the fuzzy tuning PID controller can give better control effect than the regular designed PID control. © 2015 World Scientific Publishing Company.


Fan L.-P.,Shenyang University of Chemical Technology | Liu C.-Y.,Shenyang University of Chemical Technology | Liu Y.,Branch Company of Rolling Equipment
Sensors and Transducers | Year: 2014

Electro-hydraulic servo valves are core components of the hydraulic servo system of rolling mills. It is necessary to adopt an effective fault diagnosis method to keep the hydraulic servo valve in a good work state. In this paper, RBF and BP neural network are integrated effectively to build a double hidden layers RBF-BP neural network for fault diagnosis. In the process of training the neural network, genetic algorithm (GA) is used to initialize and optimize the connection weights and thresholds of the network. Several typical fault states are detected by the constructed GA-optimized fault diagnosis scheme. Simulation results shown that the proposed fault diagnosis scheme can give satisfactory effect. © 2014 IFSA Publishing, S. L.


Fan L.-P.,Shenyang University of Chemical Technology | Li M.,Shenyang University of Chemical Technology | Shi X.-L.,Shenyang University of Chemical Technology | Liu Y.,Branch Company of Rolling Equipment
Sensors and Transducers | Year: 2014

Hydraulic automatic gauge control system of magnesium sheet mill is a complex integrated control system, which including mechanical, hydraulic and electrical comprehensive information. The failure rate of AGC system always is high, and its fault reasons are always complex. Based on analyzing the fault of main components of the automatic gauge control system, unknown input observer is used to realize fault diagnosis and isolation. Simulation results show that the fault diagnosis method based on the unknown input observer for the hydraulic automatic gauge control system of magnesium sheet mill is effective. © 2014 IFSA Publishing, S. L.


Fan L.-P.,Shenyang University of Chemical Technology | Liu Y.,Branch Company of Rolling Equipment
Applied Mechanics and Materials | Year: 2014

In the rolling process, the upper and lower working rolls of the mill usually under different load. In order to keep good product quality, load balance control is necessary. This paper proposes a control method which uses the torque difference between upper and lower roll to compensate the given current of the upper roll motor. Simulation results show that the proposed control method can give good control effect and keep load balance. © (2014) Trans Tech Publications, Switzerland.


Fan L.,Shenyang University of Chemical Technology | Fang M.,Shenyang University of Chemical Technology | Liu Y.,Branch Company of Rolling Equipment
International Journal of Control and Automation | Year: 2014

Hydraulic automatic gauge control (AGC) is a very important part of rolling mill for magnesium plate rolling. The control effect of automatic gauge control system influences the quality of the rolled product directly. AGC system is an essentially nonlinear, time delay, time-varying, large inertia, multivariable and coupling complex system, which increase the designing difficulty of control system. Based on the mathematical model of the automatic gauge control system, a simulation platform of rolling mill is set up, and a sliding mode variable structure controller is designed to realize position control for the hydraulic automatic gauge control system. The control effect of the proposed sliding mode controller is compared with that of a general PID controller whose parameters was adjusted by Ziegler-Nichols method. Simulation results show that the sliding mode controller has strong anti-interference ability and can give satisfactory control effect. © 2014 SERSC.

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