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A supervisory discrete event control scheme is proposed to configure any node of a parametric set of production machines and buffers in a manufacturing process of any desired directed graph configuration. Based on this scheme any desired configuration can be realized and maximum flexibility of the manufacturing process can be achieved. The controllability of the proposed supervisor with respect to...
The problem of controlling the motion of a vehicle entering a desired path with specific road curvature, is studied using a robust PI type controller. The lateral error of the vehicle from a desired path is measured using a look-ahead vision system. Using measurements from the vision system and the vehicle variables a robust controller is computed via a recursive algorithm based on the results of...
The problem of managing and orchestrating communication protocols is studied using the discrete event system approach. The indicative cases of the BGP, the CAN protocol and the IEEE 802.11 protocol are modelled as finite state machines Two supervisors are designed to be simultaneously applied. The first controls the consecutive connection tries of each protocol. The second orchestrates the hierarchical...
Underground mining process elevator systems are modelled using the discrete event system approach. A parametric model of the system for n gallery levels is developed in the form of a finite deterministic automaton. The desired performance of the system is expressed in the form of a set of desired languages where their properties have been investigated. A bank of supervisors satisfying the desired...
The problem of common Input/Output Decoupling for multi model descriptor linear systems via regular Proportional plus Derivative (P-D) state feedback controllers is solved. The necessary and sufficient conditions for the solvability of the problem are established. The analytic expressions of the general solution of the P-D state feedback controllers and the diagonal elements of the multi model decoupled...
The problem of common Input/Output Decoupling for multi model descriptor linear systems is solved, using a static state feedback controller. To solve the problem, an algebraic tool is developed. The necessary and sufficient conditions for the solvability of the problem are established and the set of all state feedback controllers solving the problem under these conditions is derived. The design approach...
In this paper a recursive algorithm for robustly stabilizing an uncertain gained controlled polynomial with affine linear coefficients, is presented. The finite step algorithm is constructed using the results of Hurwitz invariability and the respective results of simulated annealing tuning techniques. The algorithm is appropriately modified expanding the search horizon of previous algorithms aiming...
Numerical integration of nonlinear (NL) partial differential equations (PDEs) is studied via transformation of the system and then realization of the transformed system to a passive generalized Kirchhoff circuit. The Kirchhoff circuit is appropriately discretized in order to be represented by a discrete multidimensional (MD) system, using principles of wave digital filters (WDFs).
The problem of robust input - output decoupling (RD) using a proportional state feedback controller is studied for the case of MIMO generalized state space linear systems with nonlinear uncertain structure. Sufficient conditions for the problem to have a solution are established. If the conditions are satisfied the set of all proportional feedback controllers solving the problem subject to these conditions...
A robust control scheme for an electro hydraulic actuator is presented. A PID (Proportional — Integral — Derivative) controller is designed for controlling the position of the actuator in a wide range of physical uncertainties and external disturbances. The performance of the actuator variables is illustrated via simulations. In the future the present results will be applied to a real experimental...
In this paper a robust tracking controller is designed for a hydraulic actuator controlled by a variable displacement vane pump. The nonlinear model of the actuator is linearized around equilibrium points and a robust tracking controller is designed for the linear model covering step and ramp reference and disturbance signals. The proposed robust controller is applied to the nonlinear model. The robust...
Time delay system descriptions are usually met in mechanical systems and industrial processes. Here, the general class of linear singular neutral multi delay systems is introduced. The controller is of the general proportional multi delay state feedback type. For the case of regularizable linear singular neutral multi delay systems the design problem of disturbance decoupling (DD) is solved under...
The problem of fault detection is investigated for the case of Sequential Interindustry Models (SIMs). The model is in discrete time descriptor form including non measurable total outputs and uncertain final demand orders. For this model category the problem of fault detection is studied on the basis of the design of two observers.
A step-wise switching observer design scheme for nonlinear processes is proposed. To illustrate the steps of the approach, the scheme is applied to the nonlinear process of a double effect evaporator with short-tube vertical calandria-type units. The scheme consists of a bank of observers and a supervisor. The supervisor and the observer bank are designed on the basis of experimental data resulting...
In this paper the problem of fault detection is investigated for the case of a time varying input-output Leontief model with non measurable total outputs and uncertain net product vector. The capital coefficient matrix is considered to be block diagonal and singular. For this model category the problem of fault detection is solved on the basis of the design an appropriate unknown input observer.
A multi flight condition aircraft control autopilot system is proposed to control the horizontal flight of an aircraft involving atmospheric gusts. The control system involves a robust PID controller that stabilizes the closed loop system for various flight conditions. Considering the stability derivatives of the aircraft and the velocity of the aircraft to be uncertain parameters the robust stabilizing...
The control problem of a central heating system is studied via a PD controller feeding back the environment temperature and the performance output, i.e. the temperature of the heated room. The design goal is to compensate the influence of the environment temperature to the room temperature. To achieve this goal, a PI controller has supplementary been used. Even though, the controller is simple and...
For the class of non square general neutral time delay systems the problem of triangular decoupling is extensively solved using a dynamic realizable controller with dynamic measurement output feedback and dynamic precompensator. The necessary and sufficient condition for the solvability of the problem is established and a general class of realizable controller matrices solving the problem is derived...
Robust design techniques for controlling the velocity of a hydraulic actuator having uncertain parameters due to physical and linearization assumptions, are proposed. In particular, the design requirement of robust asymptotic command following through robust regional stabilizability is studied using an independent from the uncertainties “robust” PID controller. Moreover, the problem of robust asymptotic...
The necessary and sufficient conditions for the solvability of the exact model matching problem for general neutral single input - single output multi-delay systems, via a realizable dynamic output feedback and a realizable dynamic precompensator, are established. The general class of the realizable dynamic controllers solving the problem is analytically determined. The results are successfully applied...
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