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Because of the non-linearity, time-delay existing in alkaline pefoxide mechanical pulp (APMP) wastewater treatment process, a fuzzy expert control strategy based on DCS was proposed in this paper. A feedforward and feedback plus PID control scheme based on expert system (ES) for dissolved oxygen (DO) value control was designed, by which different control rules were made according to the derivative...
Aiming at such characteristics as severe non-linearity, time-delay existing in Alkaline Pefoxide Mechanical Pulp (APMP) wastewater aerobic treatment process, after giving a variable parameter bounded mathematical model of the activated sludge biological treatment process, a novel control method based on expert system (ES) is proposed in this paper. The basic idea is concluded as follows: A feedforward...
A simple controller design method for a two-degree-of-freedom (TDF) Smith predictor control system is investigated to obtain an improved performance of setpoint tracking and disturbance attenuation. The setpoint tracking controller and disturbance rejection controller in TDF Smith scheme are designed as ideal PID controller and approximate derivative PID controller, respectively. Each controller is...
Because of such characteristics as severe non-linearity, time-delay in wastewater aerobic treatment process of alkaline peroxide mechanical pulping (APMP), no satisfied control performance can be obtained for the control of dissolved oxygen (DO) consistency by conventional control technologies such as PID (Proportional Integral Derivative). A novel control method based on expert system (ES) is proposed...
It is now common knowledge that the PID (proportional-integral-derivative) is not suitable for controlling long time delay processes and the conventional Smith predictor is sensitive to model mismatch and has poor disturbance rejection capability. By illustrating the design procedure of the Hinfin Smith predictor and H2 Smith predictor first proposed by Zhang [9], who designed an analytical Smith...
A simple PID tuning method for dominant pole placement and phase margin specification is proposed in this paper. Time domain specifications as settling time and percentage overshoot are represented by a pair of dominant poles, which is combined with phase margin specification to achieve closed-loop stability and robustness. A graphical method is developed to determine PID settings to meet these specifications...
In this paper, a simple framework for PID controller design is presented which leads to the important popular setting, Ti=4T d. This setting first appeared in the Ziegler and Nichols tuning and has been widely adopted so far. The framework also provides analytical PID tuning formulas with improved performance over the ZN tuning
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