introductoin of control system (control theory)

Introduction of

Control System

GOVERNMENT ENGINEERING COLLAGE

DAHOD

Prepared by:140183109019 Siddqui Arshad hussain A.follow me : Web link http://sah9.blogspot.comwww.facebook.com/Sah92786https://www.linkedin.com/in/arshad-hussain-8b0a2613b

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Contain:

Introduction Terms and ConceptsOpen loop system

Closed loop systemExamples of control system

Application

Introduction

Control

• The word control is usually taken to mean:• - Regulate,

- Direct,

- Command.

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Control system

• A control system is an arrangement of physical components connected or related in such a manner as to command, direct, or regulate itself or another system.


Input

• The input is the stimulus, excitation or command applied to a control system.

• Typically from external energy source, usually in order to produce a specified response from the control system.


Output

• The output is the actual response obtained from a control system.

• It may or may not be equal to specified response implied by the input.


Terms and Concepts


Control system

• A control system is an interconnection of components forming a system configuration that will provide a desired system response.


Two Types of Control Systems

• Open Loop– No feedback– Difficult to

control output with accuracy

• Closed Loop–Must have feedback–Must have sensor on

output– Almost always

negative feedback



Open loop system

Open-loop system:

Open-loop control

An open-loop control system utilizes an actuating device to control the process directly without using feedback.

A common example of an open-loop control system is an electric toaster in the kitchen.



Closed loop system


Closed loop system:

Closed-loop control

A closed-loop control system uses a measurement of the output and feedback of this signal to compare it with the desired output.



Example of control system

Manual control system


Goal: Regulate the level of fluid by adjusting the output valve.

The input is a reference level of fluid and is memorized by operator.The power amplifier is the operator.The sensor is visual.Operator compares the actual level with the desired level and opens or closes the valve ( actuator).

The level of fluid in a tank control.


Controlling the position of a missile launcher from a remote location

The input is the desired angular position of the missile launcher, The control system consists:of potentiometer, power amplifier, motor, gearing between the motor and the missile launcher,missile launcher.


A position open loop control

The input is the desired angular position of the missile launcher, and the control system consists of potentiometer, power amplifier, motor, gearing between the motor and missile launcher, and missile launcher.


A position closed loop control

Should an error exists, it is amplified and applied to a motor drive which adjusts the output-shaft position until it agrees with the input-shaft position, and the error is zero.


Applications• Control engineering is not limited to any

engineering discipline but is equally applicable to:

• aeronautical,• chemical,• mechanical,• computer science and engineering , • civil engineering,• electrical engineering.



Reference:

• www.nptel.com• http://www.electrical-engineering-assignment.com• www.Google.co.in search engine• Control system engineering text book (Pub: techmax)• Web link http://sah9.blogspot.com• www.facebook.com/Sah92786• https://www.linkedin.com/in/arshad-

hussain-8b0a2613b

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http://www.electrical-engineering-assignment.com/electric-supply-system-a-c

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introductoin of control system (control theory)

Engineering