This document provides an introduction to control systems. It defines a control system as a system that manages or directs other systems to achieve desired results. The key types of control systems discussed are:
1. Open loop and closed loop systems. Open loop systems operate independently of output, while closed loop systems use feedback to adjust input based on output.
2. Electrical, pneumatic, hydraulic, and computer control systems which use different driving mediums.
3. Mechanical, electronic, and computer-based systems which can incorporate control systems. Accuracy, stability, sensitivity, speed, oscillation, and bandwidth are discussed as important characteristics of good control systems.
This presentation gives the information about introduction to control systems
Subject: Control Engineering as per VTU Syllabus of Aeronautical Engineering.
Notes Compiled By: Hareesha N Gowda, Assistant Professor, DSCE, Bengaluru-78.
Disclaimer:
The contents used in this presentation are taken from the text books mentioned in the references. I do not hold any copyrights for the contents. It has been prepared to use in the class lectures, not for commercial purpose.
automatic control, Basic Definitions, Classification of Control systems, Requ...Waqas Afzal
Why automatic controls is required
2. Process Variables
controlled variable, manipulated variable
3. Functions of Automatic Control
Measurement
Comparison
Computation
Correction
4.Basic Definitions
System, Plant, Process, Controller, input, output, disturbance
5. Classification of Control systems
Natural, Manmade & Automatic control system
Open-Loop, Close-Loop control System
Linear Vs Nonlinear System
Time invariant vs Time variant
Continuous Data Vs Discrete Data System
Deterministic vs Stochastic System
6. Requirements of an ideal Control system
Accuracy, Sensitivity, noise, Bandwidth, Speed, Oscillations
This presentation gives the information about introduction to control systems
Subject: Control Engineering as per VTU Syllabus of Aeronautical Engineering.
Notes Compiled By: Hareesha N Gowda, Assistant Professor, DSCE, Bengaluru-78.
Disclaimer:
The contents used in this presentation are taken from the text books mentioned in the references. I do not hold any copyrights for the contents. It has been prepared to use in the class lectures, not for commercial purpose.
automatic control, Basic Definitions, Classification of Control systems, Requ...Waqas Afzal
Why automatic controls is required
2. Process Variables
controlled variable, manipulated variable
3. Functions of Automatic Control
Measurement
Comparison
Computation
Correction
4.Basic Definitions
System, Plant, Process, Controller, input, output, disturbance
5. Classification of Control systems
Natural, Manmade & Automatic control system
Open-Loop, Close-Loop control System
Linear Vs Nonlinear System
Time invariant vs Time variant
Continuous Data Vs Discrete Data System
Deterministic vs Stochastic System
6. Requirements of an ideal Control system
Accuracy, Sensitivity, noise, Bandwidth, Speed, Oscillations
Functional elements of measurement system-
Basic Functional Elements-
1.Primary sensing element
2. Variable conversion element
3. Variable manipulation element
4. Data transmission element
5. Data storage and playback element
6. Data presentation element
Auxiliary elements-
1. calibration element
2. External power element
3. feedback element
4.microprocessor element
Chapter 1 basic components of control systemHarish Odedra
This presentation is on basic of control engineering subject which is offered to 5th sem Mechanical Engineering Department in Gujarat Technological University.
This article provides an introduction to the fundamental of Sensors and Transducers. It illustrates the different classifications of sensors and transducers. Explains capacitive, resistive and inductive transducers in brief. Also shows the examples under these types of transducers.
Functional elements of measurement system-
Basic Functional Elements-
1.Primary sensing element
2. Variable conversion element
3. Variable manipulation element
4. Data transmission element
5. Data storage and playback element
6. Data presentation element
Auxiliary elements-
1. calibration element
2. External power element
3. feedback element
4.microprocessor element
Chapter 1 basic components of control systemHarish Odedra
This presentation is on basic of control engineering subject which is offered to 5th sem Mechanical Engineering Department in Gujarat Technological University.
This article provides an introduction to the fundamental of Sensors and Transducers. It illustrates the different classifications of sensors and transducers. Explains capacitive, resistive and inductive transducers in brief. Also shows the examples under these types of transducers.
Mr. C.S.Satheesh, M.E.,
Basic elements in control systems
System
Types of Control Systems
Open Loop Control Systems
Closed Loop Control Systems
Difference Between Open loop & Closed loop Control Systems
Basic Elements of Control System, Open loop and Closed loop systems, Differential
equations and Transfer function, Modeling of Electric systems, Translational and rotational
mechanical systems, Block diagram reduction Techniques, Signal flow graph
Basic Components of a control system, Feedback and its effect, Types of feedback control Systems, Block diagrams: representation and reduction, Signal Flow Graphs, Modeling of Physical Systems: Electrical Networks and Mechanical Systems, Force-voltage analogy, Force-current analogy.
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1. Basic thermodynamics definition
2. Thermodynamics law
3. Properties , cycle, Process
4. Derivation of the Process
5.Formula for the numericals.
This topic is use full for those students who want to study basic thermodynamics as a part of their University syllabus.
Most of the university having basic Mechanical engineering as a subject and in this subject Thermodynamics is a topic so by this PPT our aim is to give presentable knowledge of the subject
INTRODUCTION TO LVDT,RVDT and Potentiometer SACHINNikam39
DISPLACEMENT MEASUREMENT - Linear variable differential transducer is a important topic under measurement and instrumentation.
in this presentation i am providing basic of LVDT,RVDT
This presentation content various types of strain gauges, derivation of gauge factor.
Various course having subject as instrumentation, measuring devices, contenting strain measurement as a topic so introduction to strain gauge can help to understand the topic.
Unit-3 Instrumentation and control in mechanical engineering and other basic subject which contain instruments and their working under the syllabus of RGPV UNIVERSITY Bhopal.
How to Split Bills in the Odoo 17 POS ModuleCeline George
Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
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Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
Andreas Schleicher presents at the OECD webinar ‘Digital devices in schools: detrimental distraction or secret to success?’ on 27 May 2024. The presentation was based on findings from PISA 2022 results and the webinar helped launch the PISA in Focus ‘Managing screen time: How to protect and equip students against distraction’ https://www.oecd-ilibrary.org/education/managing-screen-time_7c225af4-en and the OECD Education Policy Perspective ‘Students, digital devices and success’ can be found here - https://oe.cd/il/5yV
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3. CONTROL SYSTEM
A control system is a system of devices or set of devices, that manages commands, directs
or regulates the behavior of other devices or systems to achieve desired results. In other
words, the definition of a control system can be simplified as a system,
which controls other systems.
Or
A control system is a system, which provides the desired response by controlling the
output.
Control system engineering is the branch of engineering which deals with the principles
of control theory, to design a system which gives yields the desired behavior in a
controlled manner.
Examples: Automatic Washing Machine, Electric Hand Drier etc.
4. Silent Features of a Control System:
The feature of a control system is that there should be a clear mathematical relationship
between input and output of the system. When the relation between input and output of the
system can be represented by a linear proportionality, the system is called a linear control
system. When the relationship between input and output cannot be represented by single
linear proportionality, the system is referred to as a non-linear control system.
A-Good Control System:
Control system have some requirements which is needed for proper output, input behavior
which make control system good or bad as per the use. Following are the essential
requirements for good control system.
Accuracy:
Stability:
Sensitivity:
Speed:
Oscillation:
Bandwidth:
5. Accuracy: Accuracy is the measurement of the closeness to true value or tolerance of the
instrument and defines the limits of the errors made when the instrument is used in normal
operating conditions. Accuracy can be improved by using feedback elements. To increase
accuracy of any control system error detector should be present in it.
Stability: It is an important characteristic of control system. For the bounded input signal,
the output must be bounded and if input is zero then output must be zero then such a control
system is said to be stable system.
Sensitivity: The parameters of control system are always changing with change in
surrounding conditions, internal disturbance or any other parameters. This change can be
expressed in terms of sensitivity. Any system should be insensitive to such parameters but
sensitive to input signals only.
Speed: It is the time taken by it to achieve its stable output. A good control system
possesses high speed. The transient period for such system is very small.
Oscillation: A small numbers of oscillation or constant oscillation of output tend to system
to be stable.
Bandwidth: An operating frequency range decides the bandwidth of control system.
Bandwidth should be large as possible for frequency response of good control system.
6. DIFFERENT TYPES OF SYSTEM
SYSTEMS CAN BE DIFFERENT TYPES:
1. Mechanical system
2. Electronic system
3. Computer control system
4. Pneumatic system
5. Sub-systems
6. Control systems
Mechanical system: A mechanical system is a device made up of various mechanical
parts. Its input is provided by an effort. Once the effort and is applied, it can set off a
motion to move a load. The force applied to the load is the output of the mechanical
system. Examples of mechanical systems include levers, gears and shafts.
Gears
7. Electronic system: An electronic system is a system that employs electronic signals to
control devices, such as radios, calculators, video game machines, mobile phones,
portable computers etc. The input of an electronic system is provided by electronic
signals. After they are processed, they can generate output signals, which control the
operation of various devices, such as amplifiers and LCD. Electronic systems can carry
out many different tasks, such as generating sound, transmitting information, displaying
video, measuring, memorizing, calculating, etc. Common examples of electronic devices
include semi-conducting diode, transistors, and capacitors that they are usually welded
onto electronic circuit boards.
Computer and chip set
8. Computer control system: A computer control system uses a computer to control its
output devices according to different input signals. Its function is similar to that of an
electronic system. Examples of computer control systems include computer numerical
control press brakes, computer controlled home appliances, computer controlled
underground railway systems, etc.
Cnc machine
9. Pneumatic system: A pneumatic system is a system that uses compressed air to transport
and control energy. The use of pneumatic systems is very extensive, for example, in
controlling the movement of train doors, the operation of automatic production lines and
mechanical clamps, etc.
Pneumatic press
10. Sub-systems: A system may comprise some relatively small parts. They are known as
sub-systems. For instance, a lift system includes driving system, door opening system,
control system, safety system, lighting system, ventilation system and security system
Control
system
Driving
system
Door opening
system
Push the floor
button
Door
open
LIFT
Sub-systems in a lift
11. DIFFERENT TYPES OF CONTROL SYSTEMS:
Open loop and closed loop control systems there are basically two types of control
system: the open loop system and the closed loop system. They can both be represented
by block diagrams. A block diagram uses blocks to represent processes, while arrows
are used to connect different input, process and output parts.
Open loop control system: A control system in which the control action is totally
independent of output of the system then it is called open loop control system.
Process
Block diagram of an open loop control system
12. Practical Examples of Open Loop Control System:
1. Electric Hand Drier – Hot air (output) comes out as long as you keep your hand under
the machine, irrespective of how much your hand is dried.
2. Automatic Washing Machine – This machine runs according to the pre-set time
irrespective of washing is completed or not.
3. Bread Toaster – This machine runs as per adjusted time irrespective of toasting is
completed or not.
4. Automatic Tea/Coffee Maker – These machines also function for pre adjusted time
only.
5. Timer Based Clothes Drier – This machine dries wet clothes for pre-adjusted time, it
does not matter how much the clothes are dried.
6. Light Switch – Lamps glow whenever light switch is on irrespective of light is required
or not.
7. Volume on Stereo System – Volume is adjusted manually irrespective of output volume
level.
13. Advantages of Open Loop Control System:
1. Simple in construction and design.
2. Economical.
3. Easy to maintain.
4. Generally stable.
5. Convenient to use as output is difficult to measure.
Disadvantages of Open Loop Control System:
1. They are inaccurate.
2. They are unreliable.
3. Any change in output cannot be corrected automatically.
14. Closed Loop Control System: A control system in which the output has an effect on
the input quantity in such a manner that the input quantity will adjust itself based on
the output generated is called closed loop control system. Open loop control system
can be converted in to closed loop control system by providing a feedback.
15. Practical Examples of Closed Loop Control System:
1. Automatic Electric Iron – Heating elements are controlled by output temperature of
the iron.
2. Servo Voltage Stabilizer – Voltage controller operates depending upon
output voltage of the system.
3. Water Level Controller – Input water is controlled by water level of the reservoir.
4. Missile Launched and Auto Tracked by Radar – The direction of missile is controlled
by comparing the target and position of the missile.
5. An Air Conditioner – An air conditioner functions depending upon the temperature
of the room.
6. Cooling System in Car – It operates depending upon the temperature which it
controls.
16. Advantages of Closed Loop Control System:
1. Closed loop control systems are more accurate even in the presence of non-
linearity.
2. Highly accurate as any error arising is corrected due to presence of feedback
signal.
3. Bandwidth range is large.
4. Facilitates automation.
5. The sensitivity of system may be made small to make system more stable.
6. This system is less affected by noise.
Disadvantages of Closed Loop Control System:
1. They are costlier.
2. They are complicated to design.
3. Required more maintenance.
4. Feedback leads to oscillatory response.
5. Overall gain is reduced due to presence of feedback.
6. Stability is the major problem and more care is needed to design a stable closed
loop system.
17. Comparison of Closed Loop and Open Loop Control System:
Sr. No. Open loop control system Closed loop control system
1 The feedback element is absent. The feedback element is always
present.
2 An error detector is not present. An error detector is always present.
3 It is stable one. It may become unstable
4 Easy to construct. Complicated construction.
5 It is an economical. It is costly.
6 Having small bandwidth Having large bandwidth
7 It is inaccurate It is accurate.
8 Less maintenance. More maintenance
9 It is unreliable. It is reliable.
10 Examples: Hand drier, tea maker Examples: Servo voltage stabilizer,
perspiration
18. Describe the types of control system on the basis of driving medium, with
advantages and disadvantages?
On the basis of driving medium there are three types of it:
Electrical
Pneumatic
Hydraulic
Advantages of Electrical Control System
1. No air compressor and associated machinery required.
2. High efficiency since there is no leakages.
3. Very little affected by normal temperature variations.
4. Very accurate and quick response.
5. Electric cables are cheap and easy to lay.
6. No time lag or transmission delay.
7. No contamination in control medium.
19. Disadvantages of Electrical Control System
1. The system requires uninterrupted power supply with no voltage fluctuations.
2. Complex networks.
3. Standby batteries required in case of power failure.
4. There is risk of fire due to overheating. Expensive intrinsically safe / explosion proof
equipment may be required.
5. Difficult maintenance and test kit requirements.
6. Moisture may cause damage to the system.
7. Damage readily occurs in the event of a fire.
20. Advantages of Pneumatic Control System:
1. Not affected by ship’s power supply variations for short term.
2. Low cost of installation
3. No heat generated and hence no risk of fire.
4. Simplicity of the components and no complex structure
5. Actuators are cheaper and accurate than electric systems.
6. Simple control air piping system.
Disadvantages of Pneumatic Control System:
1. Require air compressor and associated systems.
2. Copper piping is vulnerable to damage
3. A clean, dry and oil free supply of good quality air is essential for satisfactory
operation of the system.
4. Good quality air require driers, filters with drains, etc. which increases maintenance.
5. May have transmission lags in large systems.
6. Pipe-couplings can give rise to leaks in certain ambient conditions
7. Potential noise
21. Advantages of Hydraulic Control System:
1. High horsepower-to-weight ratio
2. Its reliable to operate
3. Leaks easier to find
4. Maintains constant torque and force
5. Hydraulic power can be transmitted in long distances
6. Motion reversal is fast
7. Handles strong, heavy loads, shock forces
8. Costs less energy to operate
9. Lesser overall wear because of oil lubrication
10. Does not generate sparks
11. Smooth operation for lifting and movement of loads
12. Costs less energy to operate
13. Operates in hot environments
22. Disadvantages of Hydraulic Control System:
1. More expensive initial installation than pneumatic system
2. Slower motion than pneumatic.
3. Noisy
4. Risk of contamination
5. Leakage of oil problem
6. Requires more energy to operate
7. Requires more maintenance
8. Heavier components, parts
9. Hydraulic fluid dangerous to humans
10. Hydraulic fluid not environment friendly
Important questions.
Q.1 Define control system and its types?
Q.2 Explain open loop and closed loop control system with examples?
Q.3 Write down the difference between open loop and closed loop system?