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In this work, a new method to control the processes with the unmeasured input disturbance and random noise parametric uncertainty is proposed. The control structure of two-degree-of-freedom is used for enhancing the setpoint regulation and the load disturbance rejection. The tracking controller is designed by input/output linearization technique with the disturbance-free model. Based on the high gain...
Cyclohexanol is widely used in industry as a precursor for the synthesis of intermediates of Nylon. In this paper, design and control of reactive-distillation process for the production of cyclohexanol have been studied. The total annual costs of two alternative decanter configurations are comparable. However, one configuration gives much better operability than the others in the face of feed disturbances...
Hydroconversion is a complex process involving many chemical reactions. Mathematical models of hydroconversion processes often have more kinetic parameters than can be estimated from data. In this work the identifiability and estimability of parameters in a model describing the hydroconversion processing of vacuum residue are analyzed. The model under consideration contains five states, two outputs,...
We propose a novel model-based algorithm for fault detection in nonlinear and non-Gaussian systems. The algorithm utilizes particle filters to generate a sequence of hidden states, which are then used in a log-likelihood ratio test to detect faults. The state-space models considered in this article are not easily amenable to standard log-likelihood ratio test, hence, a novel test statistic based on...
A new control performance assessment method based on a structured residual for multi-stage batch processes is presented. After separating the process into different stages according to reference signal dynamics, based on specific tracking and regulatory requirements of different stage, a structured residual focusing on deterministic part of output error with different weights on each stage is minimized...
This paper proposes a new control technique for a tubular reactor modeled by first-order hyperbolic partial differential equations (PDEs). The concept of Input-Output (I/O) linearization technique is extended to apply to hyperbolic PDEs. The finite difference method is applied in the synthesis of the feedback controller, and the online computational fluid dynamics (CFD) model is used to predict the...
A neural based PID feedback control method for networked process control systems is presented. As there are some uncertain factors such as external disturbance, randomly delayed measurements or control demands in real networked process control systems, the proposed PID controller is implemented by backpropagation neural networks whose weights are updated via minimizing tracking error entropy of closed...
This paper presents a novel strategy for speeding-up the classical Benders decomposition for large-scale mixed integer linear programming problems. This method is particularly useful for the cases where the optimality cut is difficult to obtain. The distances between the selected feasible points and feasibility cutting planes, as a metric, determine the tighter constraint, thus improving the convergence...
Steam Generator (SG) is a major component in a nuclear power plant. Poor control of a nuclear steam generator can lead to frequent reactor shutdowns or it can damage turbine blades. To avoid such costly reactor shutdowns, there is a need to systematically investigate the problem of controlling the water level in the steam generator. In this work, we have proposed a novel concept of feedback-feedforward...
A new approach to an approximate input-output (I/O) linearization controller for nonlinear processes that exhibit non-minimum phase behavior is presented. The I/O feedback controller is formulated in the form of the series solution. The Taylor series method is applied to truncate the time derivatives of outputs around the steady state pair corresponding to the desired set-point. The reduced-order...
Focusing on ethylene oxide (EO) hydration reactor industrial equipment, the reaction mechanism model is established. Based on the principle of material balance, energy balance and kinetics of the reactions of ethylene oxide with water, partial least squares regression (PLSR) was used in the model to establish a corresponding relationship between the reaction rate constant and the reaction temperature...
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