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Headbox is the key component in a paper machine which has a significant effect on product quality. In this paper, a hybrid model which combines mixing tank and air-cushioned headbox is proposed. In the hybrid model, the mixing tank is taken into consideration, which makes the consistency of pulp controllable. An internal model controller with both good control effect and strong robustness is designed...
This paper investigates the periodic disturbance rejection control of time-delay process by integrating a modified disturbance observer (MDOB) and internal model control (IMC) structure. A modified disturbance observer design method based on zero-pole placement is proposed. By the MDOB, periodic disturbance can be accurately estimated and the estimation is used as compensation to suppress disturbance...
For the non-integer order process with time-delay, a design and tuning method of two-degree-of-freedom fractional order internal model controller is proposed. This method can over the disadvantages of single-degree-of-freedom PID controller that can not achieve the best performance of the command tracking characteristic and disturbance rejection characteristic at the same time. The time-delay term...
In this paper a robust predictive neuro-fuzzy control method for a nonlinear plant is addressed, proposed and tested. A neuro-fuzzy model is used to identify the process and then provides predictions about the process behavior, based on control actions applied to the system. The paper consists of theoretical and practical section, offers an internal model control and a neuro-fuzzy internal model control...
This paper deals with the Internal Model Control (IMC) design which is based on the use of a specific controller and extended to the case of linear multivariable underactuated systems. The case of a class of linear underactuated systems with two degrees of underactuation will be considered in order to confirm the effectiveness of the proposed approach to ensure set-point tracking and disturbance rejection...
The presented paper deals with design, co-simulation and comparison of three controller design methods (Internal Model Control, Pole-Placement, PID by Modulus Optimum) applied in the control of processes with complex dynamics. The presented and tested methods guarantee robust stability and high performance of controlled system. Proposed algorithms were successfully implemented in Matlab-Simulink using...
In this paper, closed loop performance of a system with hard nonlinear limitations is analyzed. In order to adequately control such a challenging process, an Internal Model Control strategy has been implemented. The controller has been applied to a real time process described by a radio satellite antenna. The performance of the closed loop has been evaluated by changing the natural frequency and the...
Actuator constraint handling is necessary for many cross-directional controllers. We discuss how optimal steady state performance can be guaranteed by modifying an internal model control structure with a non-linear element. For the simple dynamics associated with most web processes this also gives good closed-loop dynamic behaviour. Thus unconstrained control design techniques may be applied directly...
The gas turbine is an extremely important component for the automotive and aviation industry. It works by converting the energy obtained by fuel combustion into some form of mechanical power. Therefore, controlling the input fuel going to the turbine is an important aspect of the gas turbine system. Therefore, an efficient controller design is required which can control the rate of the fuel being...
This document presents a new Internal Multi-Model Command controller design method for a linear system with a limited uncertain time delay. This design method is based on the use of a models collection to approximate the system functioning using Padé approximations; these models are inversed and multiplied by low pass filters in order to obtain a set of controllers to calculate the command value through...
The aim of this paper is to design a fuzzy logic controller for the conical tank liquid level system. Control of liquid level in a conical tank is nonlinear due to the variation in the area of cross section of the tank system with its change in shape. The model of the process is identified using standard step response based system identification technique and it is approximated to be a first order...
In this paper, we adapt a recently proposed Internal Model Control (IMC) based controller design approach for simultaneous decoupling and disturbance rejection for a practical Multiple Input Multiple Output (MIMO) system, namely, for designing a controller for a Stirred Water Tank System (Two Input Two Output). While retaining the central aspect of the reported method, namely using the off-diagonal...
The paper presents robust control systems based on the Model-Following Control concept. There are analyzed three control structures extended to the general n-loop case. The parallel way in which the proposed structures are built reduces the time the signal is propagated in the loops, which outperforms the well-known serial cascade structure. Additionally, employing forward dynamical models relieves...
Feedback control problems for distributed parameter systems arise in a variety of physical, chemical, biological, and mechanical systems. This paper exploits the algebraic structure of the system of ordinary differential equations that arise from spatial discretization of the partial differential equation (PDE) to analyze and design feedback controllers that are robust to bounded perturbations in...
Based on the desired dynamic equation (DDE), PID control systems were designed for common processes, higher-order processes, non-minimum phase processes and integrating processes. Also Dynamic simulation and performance robustness test were made for systems. During the design process, the approximate plant models were not needed, the PID controller parameters were achieved by choosing the desired...
A control method performed by a fuzzy logic set-point weight IMC-PID controller has been presented. The set-point weight of the proportional part acted on the IMC-PID controller can be modified online by intelligent method, and the parameter of IMC-PID controller can be manual adjusted. The method not only can improve the short-coming of the conventional IMC-PID controller, but also it has simple...
The system often has time-delay phenomenon in actual industrial process. In order to avoid the effect of time delaying on the system stable robustness and suppression on disturbance capability, based on the good track ability of the feed-forward control and the control superiority of the internal model control (IMC) on the the time-delay system, a internal model control method based on the feed-forward...
In terms of double-controller design technology and relay feedback identification method an autotuning IMC structure with two degree of freedom (TDF-IMC) is proposed in this paper. The model parameters of the controlled process are identified via a modified relay feedback identification method. The setpoint tracking IMC controller and disturbance attenuation IMC controller are designed, respectively,...
An adaptive IMC-PID control method based on neural network (NN) is proposed for the typical industrial process in this paper. The conventional IMC-PID provides a convenient method of tuning parameter according to the requirement of the control performance for closed-loop system because it has only one regulable parameter. But when the parameters variation and uncertainty factors are included in the...
Aiming at the complexity of hydraulic vibrancy platform, a PID control method of double closed loop control based on IMC control principle is put forward. It realized the proportion control in inner loop using the anti-interference of the PID control, and the controlled object was transformed into a one-order inertia link with the time-delay unit. After approximating the time-delay unit by the 1/1...
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