431-314 Computer Control

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Objectives:

On completion of this subject students should:

• understand the concept and importance of computer control for industrial automation;

• understand the techniques for analysis and simulation of computer control systems;

• understand the techniques for practical implementation of computer control systems;

• be able to design and implement simple digital controllers for practical process control.

Content:

Introduction to computer control: Computer control systems, sampling process and devices, representations of digital control systems. z-transform analysis of digital control systems: Properties of z-transform, z-transfer function of discrete systems, poles and zeros, stability, time domain response and frequency domain response, mapping between the s-plane and z-plane. State space analysis of digital control systems: State space equations for digital control systems, solutions to the state equations, controllability and observability, Liapunov stability analysis. Digital simulation and redesign: Discretisation of continuous systems, numerical integration, hold equivalent, zero-pole mapping, digital redesign of digital controllers. Design of computer control systems: Design of digital controllers using frequency response method, digital PID controller, deadbeat controller, pole placement controller, design of digital controllers using state space method, state feedback pole placement, output feedback control using state observers. Implementation of digital controllers: Sampling rate selection, analog-digital interfacing, pre-filtering, round-off errors, real-time computation and programming.

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