Control Systems

Control system is an important mechanism which alters the state of the system based on the input to the system. An efficient control system enhances the productivity of a components by providing fine control over the desired range. In the nature everything is controlled or other wise leads to catastrophic manner which creates a huge damage. In the same way in and around you everything is controlled by some component to ensure the stability. For example a light in a room is controlled by an electric switch. When a switch is on electricity flows and the light will be on, same for the reverse operation. The articles are divided in to sections shown in bellow.

Basics of control system

The control system consists of three components

  1. Input
  2. Logic operation
  3. Output or decision device

Input is the cause parameter on which the control system acts, The logic operation is the intended or desired operation to perform on the input for generating a new output state.

Basic control system

Basic control system

The output is drive parameter which actuates the end component to perform the desired task. These can be open loop or closed loop control systems depends on output feed back. Block diagram reduction helps in analysis and simplification of control system.

Frequency Domain Anylysis

Frequency Domain Anylysis

Frequency Domain Analysis

Frequency response of the system is a steady state response the system in which the output may differs in amplitude and phase. Analysis a system in frequency domain is easy compared to time domain analysis. Based on the output response characteristics the behavior of the system can be predicted. The various frequency domain analysis techniques are root locus, bode plots, Nyquist plots etc.

Process Control

Process is a method of changing raw materials in to useful end product. The raw materials changes it state from one form to another form (liquid to gas etc) during the conversion process. The process industries may be chemical industry, power industry, manufacturing industry. Process control refers to the methods which are used to control the process parameters to obtain a good end product. Now a days increase in electronics growth and enhancement in control strategies almost all the process are automatic to reduce the manual intervention. PID controller and advanced controllers places a major role automatic control system.

Process control

Process control

PLC

PLC

Programmable Logic controller (PLC)

With the advanced electronics PLC are the most widely used logic controllers for controlling the plant components. Small PLC can control the number of components with the desired logic. Where as input and output components are same as basic control system and logic operation is replaced with PLC to increase the efficiency and integrity.

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