Dual cascade control design for binary distillation columns

2006 ◽  
Author(s):  
E. Castellanos-Sahagun ◽  
J. Alvarez
Keyword(s):  
Control Design ◽  
Cascade Control ◽  
Distillation Columns

Backstepping design of composition cascade control for distillation columns

AIChE Journal ◽  
2002 ◽  
Vol 48 (8) ◽  
pp. 1705-1718 ◽  
Author(s):  
Jose Alvarez-Ramirez ◽  
Jesus Alvarez ◽  
Rosendo Monroy-Loperena
Keyword(s):  
Cascade Control ◽  
Backstepping Design ◽  
Distillation Columns

An Analytic Approach to Cascade Control Design for Hydraulic Valve-Cylinder Drives

2016 ◽  
Author(s):  
Lasse Schmidt ◽  
Anders H. Hansen ◽  
Torben O. Andersen ◽  
Henrik C. Pedersen
Keyword(s):  
Motion Control ◽  
Control Design ◽  
Cascade Control ◽  
Analytic Approach ◽  
Control Approach ◽  
Electrical Drives ◽  
Gain Margin ◽  
Position Feedback ◽  
Hydraulic Valve ◽  
Piston Position

Motion control design for hydraulic drives remains to be a complicated task, and has not evolved on a level with electrical drives. When considering specifically motion control of hydraulic drives, the industry still prefers conventional linear control structures, often combined with feed forward control and possibly linear active damping functionalities. However difficulties often arise due to the inherent and strong nonlinear nature of hydraulic drives, with the more dominant being nonlinear valve flow- and oil stiffness characteristics, and furthermore the volume expansion/retraction when considering cylinder drives. A widely used approach with electrical drives is state controlor cascade control, that may by successfully applied to manipulate the drive dynamics in order to achieve high bandwidths etc., due to the nearly constant parameter-nature of such drives. Such properties are however, unfortunately not present in valveoperated hydraulic drives. This paper considers a cascade control approach for hydraulic valve-cylinder drives motivated by the fact that this may be applied to successfully suppress nonlinearities. The drive is pre-compensated utilizing a pressure updated inverse valve flow relation, ideally eliminating the system gain variation, and the linear model equations for the pre-compensated system is used for the cascade control design. The cascade design does not utilize e.g. bode plots, root loci etc., and is based on an analytic approach, emphasizing the exact influence of each control parameter, resulting in an easily comprehensible control structure. Two versions of this cascade control approach is presented, with the first utilizing pressure-, piston velocity- and piston position feedback, and the second utilizing only pressure- and piston position feedback. The latter may be especially interesting in an industrial context, as this does not use the velocity feedback, which is rarely available here. Furthermore, the position control loop is designed analytically to guarantee a user defined gain margin. The proposed control design approach is verified through simulations, and results demonstrate the announced properties.

LQR Control Design of Discrete-Time Networked Cascade Control Systems With Time Delay

2011 ◽  
Author(s):  
Rohit K. Belapurkar ◽  
Rama K. Yedavalli
Keyword(s):  
Control System ◽  
Control Systems ◽  
Discrete Time ◽  
Time Delays ◽  
Control Design ◽  
Aircraft Engine ◽  
Cascade Control ◽  
Engine Control ◽  
Lqr Control ◽  
Turboshaft Engine

Series cascade control systems, in which, the output of one process drives a second process are studied extensively in literature. Traditional control design methods based on transfer function approach are used for design of cascade control systems with disturbances in inner loop and time delays in outer loop process. Design of current turboshaft engine control systems are based on cascade control system framework. Next generation aircraft engine control systems are based on distributed architecture, in which, communication constraints like time delays can degrade control system performance. Stability of networked cascade control systems for turboshaft engines in a state space framework is analyzed in the presence of time delays. Two architectures of networked cascade control systems are presented. Stability conditions for discrete-time cascade control systems are presented for each of the architecture with time delays which are more than the sampling time.

Backstepping-based cascade control scheme for batch distillation columns

AIChE Journal ◽  
2004 ◽  
Vol 50 (9) ◽  
pp. 2113-2129 ◽  
Author(s):  
Rosendo Monroy-Loperena ◽  
Jose Alvarez-Ramirez
Keyword(s):  
Cascade Control ◽  
Batch Distillation ◽  
Distillation Columns ◽  
Control Scheme

scholarly journals A Novel Family of Exact Nonlinear Cascade Control Design Solutions for a Class of UAV Systems

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Kristian Maya-Gress ◽  
Jorge Álvarez ◽  
Raúl Villafuerte-Segura ◽  
Hugo Romero-Trejo ◽  
Miguel Bernal
Keyword(s):  
Control Design ◽  
Cascade Control ◽  
Second Step ◽  
Control Laws ◽  
Control Scheme ◽  
Cascade Structure ◽  
Vehicle Position ◽  
Angular Coordinates ◽  
Double Integrator ◽  
Computed Torque

In this work, a novel family of exact nonlinear control laws is developed for trajectory tracking of unmanned aerial vehicles. The proposed methodology exploits the cascade structure of the dynamic equations of most of these systems. In a first step, the vehicle position in Cartesian coordinates is controlled by means of fictitious inputs corresponding to the angular coordinates, which are fixed to a combination of computed torque and proportional-derivative elements. In a second step, the angular coordinates are controlled as to drive them to the desired fictitious inputs necessary for the first part, resulting in a double-integrator 3-input cascade control scheme. The proposal is put at test in two examples: 4-rotor and 8-rotor aircrafts. Numerical simulations of both plants illustrate the effectiveness of the proposed method, while real-time results of the first one confirm its applicability.

Temperature Cascade Control of Distillation Columns

1996 ◽  
Vol 35 (2) ◽  
pp. 475-484 ◽  
Author(s):  
Erik A. Wolff ◽  
Sigurd Skogestad
Keyword(s):  
Cascade Control ◽  
Distillation Columns
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