Control Systems

Control Systems. Lect. 1 Introduction Basil Hamed. Introduction. 1. What is a control system. 2. Why control systems are important. 3. What are the basic components of a control system. 4. S ome examples of control-system applications.

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Control Systems

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Control Systems Lect. 1 Introduction Basil Hamed
Introduction 1. What is a control system. 2. Why control systems are important. 3.What are the basic components of a control system. 4. Some examples of control-system applications. 5.Why feedback is incorporated into most control systems. 6. Types of control systems. Basil Hamed
What is a control system A control system is considered to be any system which exists for the purpose of regulating or controlling the flow of energy, information, money, or other quantities in some desired fashion. Basil Hamed
What is a control system • An interconnection of components forming a system configuration that will provide a desired system response • The study of control provides us with a process for analyzing and understanding the behavior of a system given some input • It also introduces methods for achieving the desired system response Basil Hamed
Input Output System Systems and Control A System is a device or process that takes a given input and produces some output: • A DC motor takes as input a voltage and produces as output rotary motion • A chemical plant takes in raw chemicals and produces a required chemical product
Why control systems are important • In recent years, control systems have assumed an increasingly important role in the development and advancement of modern civilization and technology. • Practically every aspect of our day-to-day activities is affected by some type of control system. • Control systems are found in abundance in all sectors of industry, such as quality control of manufactured products, automatic assembly lines, machine-tool control, space technology and weapon systems, computer control, transportation systems, power systems, robotics, Micro-Electro-Mechanical Systems, nanotechnology, and many others. Basil Hamed
Basic Components of a Control System 1. Objectives of control. 2. Control-system components. 3. Results or outputs. Basil Hamed
Examples of Control-System Applications Potential applications of control of these systems may benefit the following areas: • Machine tools. Improve precision and increase productivity by controlling chatter. • Flexible robotics. Enable faster motion with greater accuracy. •Photolithography. Enable the manufacture of smaller microelectronic circuits by controlling vibration in the photolithography circuit-printing process. • Biomechanical and biomedical. Artificial muscles, drug delivery systems, and other assistive technologies. • Process control. For example, on/off shape control of solar reflectors or aerodynamic surfaces. Basil Hamed
Examples of Control-System Applications Steering Control of an Automobile: • As a simple example of the control system, consider the steering control of an automobile. The direction of the two front wheels can be regarded as the controlled variable, or the output, y; the direction of the steering wheel is the actuating signal, or the input, u. • The control system, or process in this case, is composed of the steering mechanism and the dynamics of the entire automobile. However, if the objective is to control the speed of the automobile, then the amount of pressure exerted on the accelerator is the actuating signal, and the vehicle speed is the controlled variable. Basil Hamed
Examples of Control Applications • Aerospace Applications: • Aircraft or missile guidance and control • Space vehicles and structures
Examples of Control-System Applications Sun-Tracking Control of Solar Array: To achieve the goal of developing economically feasible non-fossil-fuel electrical power, development of solar power conversion methods, including the solar-cell conversion techniques Basil Hamed
Why feedback is incorporated into most control systems Control Systems can be classified as : • open loop system (Nonfeedback System) • closed loop system (Feedback System). Basil Hamed
Open-Loop Control Systems (Nonfeedback Systems) The elements of an open-loop control system can usually be divided into two parts: the controller and the controlled process, as shown by the block diagram Basil Hamed
Open Loop Control Systems A system in which the output has no effect on the control action is known as an open loop control system. For a given input the system produces a certain output. If there are any disturbances, the out put changes and there is no adjustment of the input to bring back the output to the original value. Basil Hamed
Open-Loop Control Systems • The controlled ‘output’ is the resulting toast • System does not reject changes in component characteristics Basil Hamed
Closed-Loop Control Systems (Feedback Control Systems) • What is missing in the open-loop control system for more accurate and more adaptive control is a link or feedback from the output to the input of the system. • To obtain more accurate control, the controlled signal y should be fed back and compared with the reference input. Basil Hamed
Process Dynamics Controller/ Amplifier Desired Output Input Output + - Measurement Open-Closed Loop Control Open-loop control is ‘blind’ to actual output Closed-loop control takes account of actual output and compares this to desired output
TYPES OF FEEDBACK CONTROL SYSTEMS Feedback control systems may be classified in a number of ways, depending upon the purpose of the classification. For instance, according to the method of analysis and design, control systems are classified as: Linear or Nonlinear Time-varying or Time-invariant Continuous-data or Discrete-data Basil Hamed
Control Many control systems can be characterised by these components Disturbance Plant Control Signal u(t) Output y(t) Reference r(t) Error e(t) Control Actuator Process + - Feedback Sensor Sensor Noise
Actuation A device for acting on the environment
Sensing A device for measuring some aspect of the environment
Examples : Washing Machine • System Requirements • Understanding of load sizes • Receptacle to hold clothes • ‘Plumbing’ • Ease of use, Reliability • Low Cost • Actuators • AC or DC Motors • Water inlet/drain • Sensors • Water level • Load speed/balance • Control • Choice depends on design
Examples : The CD Player • A CD player is an example of control system • Requires • Accurate positioning of the laser read head • Precise control of media speed • Conversion of digital data to analogue signal
Examples : Hard Drive • A computer disk drive is another example of a rotary control system • Requires • Accurate positioning of the magnetic read head • Precise control of media speed • Extraction of digital data from magnetic media
Examples : Modern Automobiles • Modern Automobiles are controlled by a number of computer components • Requires • Control of automobile sub systems • Brakes and acceleration • Cruise control • ABS • Climate control • GPS • Reliability • Low cost • Ease of use
The Control Problem Generally a controller is required to filter the error signal in order that certain control criteria or specifications, be satisfied. These criteria may involve, but not be limited to: • Disturbance rejection • Steady state errors • Transient response characteristics • Sensitivity to parameter changes in the plant Basil Hamed
The Control Problem Solving in control problem generally involves; • Choosing sensors to measure the plant output • Choosing actuators to drive the plant • Developing the plant, actuator, and sensors equations • Designing the controller • Evaluating the design analytically by simulation, and finally by testing the physical system. • If the physical tests are unsatisfactory, iterating these steps. Basil Hamed
The Control Problem Problem Formulation Solution Translation • Mathematical model system Physical System • Mathematical solution of mathematical problem Basil Hamed
Modeling Physical Systems - Overview Basil Hamed
Modeling – Remarks • Modeling is the most important and difficult task in control system design. • No mathematical model exactly represents a physical system. Math Model ¹Physical System Math Model »Physical System • Do not confuse models with physical systems! • In this course, we may use the term “system” or “plant” to mean a mathematical model. Basil Hamed

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