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 Introduction

Dr. Fouad M. AL-Sunni

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Role

 

are concerned with understanding and

environment (Systems) to provide useful

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Activities

Modeling

es gn ng

Testing Implementation

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Some historical examples’ -

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Some historical examples

-

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Automation im act

PRODUCTIVITYand to obtain high-quality products

ater a an ng

Condition Based Monitoring maintenance)

Safety and Security Transportation Etc…

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Foundation/knowled e Feedback theor

Linear system analysis

Knowledge

Network theory Communication theory

Reliability and maintenance theory

a e y eory

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Definition

 

components forming a system

system response.

Analysis in general involves: Linear system Theory : Assumes Cause-

effect relationship for the components of as stem.

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Control S stem Definition

A control system consists of subsystems and processes (plants)

assembled for the purpose of controlling the outputs of the

.

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Res onse Characteristics

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Advanta es of Control S stemsWe build control systems for four primary reasons:

• Power amplification (gain)

ex: Positioning a large radar antenna by low-power

rotation of a knob.

ex: Opening and closing valves

 

ex: Robot arm used to pick up radioactive material.

ex: Unmanned Aerial Vehicules.

ex: Remote Terminal Unit in oil production

• Convenience of input form

ex: Changing room temperature by thermostat position.

ex: Quality Control using limit switch

•  

ex: Controlling antenna position in the presence of 

large wind disturbance torque.

ex: Control Inventory under variable demand

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O en-Close-Multivariable

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Usual Re resentation

 

represented by a block

ProcessInput Output

Cause Effect

SISO: Sin le in ut Sin le out ut

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Usual Re resentation

Desired Outputc ua or rocess

Output response

SIMO: Single input multiSIMO: Single input multi--outputoutput

MISO:MISO:

MIMO:MIMO:

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O en-Loo Control S stem

-

actuating device to control the process.

Actuator ProcessDesiredOutput response

Output

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O en loo s stem

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Close-Loo Feedback Control

-

measurement of the output and feedback

desired output (reference or command)

Comparison Actuator ProcessDesiredOutput

Output

Measurement

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Advanta es/Disadvanta esO en-Loo S stems Closed-Loop Systems

Simple Inexpensive

Complex & expensive Less sensitive to noise,

Cannot correct fordisturbances or plant

disturbances, plant

variations. e er con ro o rans en

steady-state response

Better accurac

Self-sustained oscillationspossible

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An Example:

,

520 million tons of coal, ,

mine 774 million tons.

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Examples:

 

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Examples:

 

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Examples:

 

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The desi n rocess

Design is the process of inventing theforms arts and details of a s stem toachieve a specific goal

Terminolo Specifications

alternatives

Trade-off Synthesis

opt m zat on

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The desi n rocess

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A design example

 

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A design example

-

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Another exam le

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Another example…

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Case Study: Antenna Azimuth Position

A. System Concept

B. Detailed Layout

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Case Study: Antenna Azimuth Position

C. Schematic diagram

D. Functional block diagram

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Case Study: Antenna Azimuth Position

• System normally operates to drive pointing error to zero.• Motor is driven only when there is a pointing error.

.

• Too large a signal amplifier gain could cause overshoot/instability.

balance between transient performance,steady-state performance, and stability.Adjusting gain & adding compensators are

this balance.

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HW # 1

.

P1.1,1.4,1.7,and 1.15