INTRODUCTION TO CONTROL SYSTEMSBEKC 3533

INFO Name: Tarmizi Bin Ahmad Izzuddin Ext: 06-555 2361 Email: tarmizi@utem.edu.my Room: A/3-15 Qualifications

Diploma in Electronics Engineering, UTM Degree in Electrical Engineering (Control &

Instrumentation), UiTM MSc. Advanced Process Control, UTP

INFO Lectures: 3 hours per week

Tuesday: 4pm – 6pm Wednesday: 8am – 9am Thursday: 10am – 11am

Tutorial?: 1 hour per week Text Book: Control Systems Engineering,

Norman Nise. (Compulsory), RM73 Chapters: 10

LEARNING OUTCOME Describe the basic features and

configuration of control systems Apply appropriate techniques to perform

block diagram reduction of multiple subsystems in order to obtain its transfer function

Construct the mathematical model for electrical, mechanical and electromechanical linear time invariant systems in frequency domain and time domain

LEARNING OUTCOME cont. Analyze the transient and steady state

performance for first and second order systems

Sketch and describe the root locus of a system

Construct the asymptotic approximation Bode plots for first order and second order systems

Other references: Modern Control Systems - Bishop, Dorf Modern Control Systems – Ogata Process Dynamics and Control - Seborg

ASSESSMENT Quiz: 5%

Every chapter Pop quiz

Test: 30% Assignments: 15% Final Exam: 50%

INTRODUCTION TO CONTROL SYSTEMCHAPTER 1

OBJECTIVES Define the control system State the advantages of control system Describe the response characteristics, open-loop and

closed-loop systems Find out the differences between open-loop and

closed loop systems State the analysis and design objectives of control

system Describe the terms in control system such as input,

output, controller, feedback, plant, transient response, steady-state response, steady-state error and stability.

WHAT IS CONTROL?

WHAT IS CONTROL SYSTEMS? Control systems are an integral part of

modern society. Numerous applications are all around us. Basic concept

Water pipe Steering wheel

CONTROL SYSTEM DEFINITIONS Consists of subsystems and processes

(or plants) assembled for the purpose of controlling the output of processes.

In other word, a control system provides an output or response for a given input or stimulus.

RESPONSE CHARACTERISTICS

OPEN LOOP CONTROL SYSTEMS

CLOSE LOOP CONTROL SYSTEMS

OPEN & CLOSE LOOP CONTROL SYSTEMS

Does not have the feedback path.

Output response: not accurate.

Sensitive to noise, disturbances and changes in the environment.

The system cannot correct the disturbances.

Simple and inexpensive.

Have the feedback path. Output response: greater

accuracy. Less sensitive to noise,

disturbances and changes in the environment.

The system can compare the output response with the input and make a correction if there is any difference.

More complex and expensive.

OPEN LOOP CONTROL SYSTEMS

CLOSE LOOP CONTROL SYSTEMS

ANALYSIS & DESIGN OBJECTIVES Control systems are dynamic: they

response to an input by undergoing a transient response before reaching steady-state response that generally resembles the input.

3 major objectives:- Producing the desired transient response Reducing steady-state error Achieving stability

ANALYSIS & DESIGN OBJECTIVES Transient Response

Too fast or too slow Have to analyze the system for its existing

transient response. Then, adjust parameters or design components to yield a desired transient response.

Steady State Response Resembles the input Define steady-state errors quantitatively Analyze a system’s steady-state error Design corrective action to reduce this error

ANALYSIS & DESIGN OBJECTIVES Stability

The transient response is the sum of natural and forced responses with the natural response is large.

The steady-state response is also the sum of natural and forced responses with natural response is small.

ANALYSIS & DESIGN OBJECTIVES For a control system to be useful, natural

response must approach zero. If natural response much greater than

forced response, the system is no longer controlled. This condition called instability.

Control system must be design to be stable. If the system is stable, the proper transient response and steady-state error characteristics can be designed.

THE ENDTHANK YOU