MODERN CONTROL DESIGN WITH MATLAB AND SIMULINK

MODERN CONTROL DESIGN WITH MATLAB AND SIMULINK

1. OPEN-LOOP CONTROL SYSTEM

   • Such a control system, in which the control input is applied without the knowledge of the plant output, is called an open-loop control system.
     • shows a block-diagram of an open-loop control system, where the sub-systems (controller and plant) are shown as rectangular blocks, with arrows indicating input and output to each block.

2. CLOSED-LOOP CONTROL SYSTEMS

   • On a block-diagram, the path from the plant output to the controller input is called a feedback-loop
   • Since in a closed-loop system the controller is constantly in touch with the actual output, it is likely to succeed in achieving the desired output even in the presence of noise and/or uncertainty in the linear plant's behavior (transfer-function)

3. WHAT IS CONTROL?

   • When we use the word control, we refer to the act of producing a desired result, control is the domain, command and preponderance, to the regulation of a system. The control is considered to cover all artificial processes.
   • • consists of the system to be controlled, called the plant, as well as the system that exercises control over the plant, called controller. When referring to an isolated system, the terms input and output are used to describe the signal that enters a system, and the signal that comes out of a system, respectively.
   • The controller transfer
     • The transfer function of the controller is the main design parameter in the design of a control system and determines how fast and with what maximum overshoot (ie, the maximum value of | yd - y |) - the actual output, and , will be equal to the desired output, and d, given a set of design requirements.

4. CONTROL SYSTEM

   • can be classified according
     • the physical nature of the laws obeyed by the system
     • the mathematical nature of the governing differential equations
     • Chaotic system: a small change in the initial conditions produces an arbitrarily large change in the state of the system at a later time.
     • Deterministic system: the set of physical laws that govern the system is such that if the state of the system and the input are specified, then one can accurately predict the state at a later time.

5. Matlab,simulink,and the control system toolbox

   • • The repetitive linear algebraic operations required in modern control design and analysis are, however, easily implemented on a computer with the use of standard programming techniques

6. FEEDBACK

   • The mechanism by which the information about the actual output is conveyed to the controller is called feedback. On a block-diagram, the path from the plant output to the controller input is called a feedback-loop.
     • it is a management system that periodically examines the process that is in charge to make changes that improve the efficiency of its production. appears when the outputs of a system are re-routed as inputs as part of a cause and effect chain that forms a loop circuit
     • appears when the outputs of a system are re-routed as inputs as part of a cause and effect chain that forms a loop circuit
     • Many of the operations that include modern manufacturing facilities have implemented feedback control systems to control and adjust the production process.

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